CN116733740A

CN116733740A - Single-shaft eccentric screw pump

Info

Publication number: CN116733740A
Application number: CN202310160508.7A
Authority: CN
Inventors: 香水宪司; 须原伸久
Original assignee: Heishin Ltd
Current assignee: Heishin Ltd
Priority date: 2022-03-10
Filing date: 2023-02-24
Publication date: 2023-09-12
Also published as: KR20230133200A; JP2023132374A

Abstract

The purpose of the present invention is to provide a uniaxial eccentric screw pump which can position and set a shaft seal member on the output shaft side with high precision when a connecting shaft is connected with the output shaft, and can make the connecting part on the output side have a structure with a larger diameter than the output shaft, and can easily carry out maintenance and the like of the shaft seal member; the uniaxial eccentric screw pump (10) is configured to: a shaft seal member (60) is provided on the drive shaft (56), and the second shaft coupling portion (150) is configured to attach an adapter (160) that is detachable from the drive shaft (56) to the drive shaft (56) at a position that is offset to the axial end side of the drive shaft (56) from the shaft seal member (60); the adapter (160) has an adapter enlarged diameter portion (162 x) that bulges in a direction intersecting the axial direction of the drive shaft (56) as compared with the drive shaft (56).

Description

Single-shaft eccentric screw pump

Technical Field

The invention relates to a single-shaft eccentric screw pump.

Background

Conventionally, in a uniaxial eccentric screw pump or the like disclosed in patent document 1 below, rotational power output from an output shaft of a drive machine can be transmitted to a rotor via a coupling shaft such as a flexible rod. The coupling portion (coupling structure portion) between the coupling shaft and the shaft body (driving shaft in patent document 1) connected to the coupling shaft is coupled by adhesion after one is inserted into the other.

In the uniaxial eccentric screw pump disclosed in patent document 2, a threaded shaft portion provided at the distal end of a flexible rod is inserted into and screwed into a shaft insertion hole provided in a rotor or a drive shaft, and then joined. Further, the end of the flexible rod is brought into surface contact with the end surface of the rotor or the drive shaft as a flange portion. By such joining, the two shafts can be joined so as not to generate rattle.

[ Prior Art literature ]

[ patent literature ]

Patent document 1: japanese patent No. 3629100

Patent document 2: japanese patent No. 5724096

Disclosure of Invention

Here, the inventors of the present invention studied on a configuration in which a portion (hereinafter also referred to as "expanded portion") formed in a flange shape or the like and expanded in diameter is provided on a connecting shaft (first shaft) having flexibility such as a flexible rod and connected to an output shaft (second shaft) which receives an output of a driving machine and rotates, and the expanded diameter is increased in order to form a stronger connection. As a result, in the case of adopting such a configuration, it is necessary to provide a connecting portion having a size corresponding to the expanded diameter portion provided at the connecting portion constituting the first shaft on the output shaft constituting the second shaft. When such a connecting portion is provided on the output shaft and a shaft seal member is provided to be attached to the output shaft, the entire output shaft needs to be pulled out when maintenance is necessary, and this causes a problem of poor workability.

Accordingly, an object of the present invention is to provide a uniaxial eccentric screw pump in which, when a connecting shaft is connected to an output shaft, the connecting shaft and the output shaft can be firmly connected by adopting a structure in which a connecting portion on the output side is enlarged in diameter from the output shaft, and maintenance of a shaft seal member and the like can be easily performed.

(1) In order to solve the above problems, a uniaxial eccentric screw pump according to the present invention includes: a flexible coupling shaft, a rotor comprising a male-threaded shaft body, and a female-threaded stator having an inner peripheral surface, the rotor being insertable into the stator; the single-shaft eccentric screw pump has a drive-side connecting portion formed by directly or indirectly connecting a first shaft connecting portion provided on the connecting shaft and a second shaft connecting portion provided on an output shaft that receives an output of a drive machine and rotates; the shaft seal component is arranged on the output shaft; the second shaft coupling portion is configured by attaching an adapter that is detachable from the output shaft to the output shaft at a position that is offset to an axial end side of the output shaft from the shaft seal member; the adapter has an adapter expanded diameter portion that bulges in a direction intersecting the output shaft axial direction with the axis direction of the output shaft.

The uniaxial eccentric screw pump of the present invention is configured such that a shaft seal member is provided on an output shaft, and an adapter constituting a second shaft coupling portion of the output shaft is provided at a position closer to an axial end side of the output shaft than the shaft seal member. The adapter is detachable from the output shaft, and has an adapter enlarged diameter portion that bulges in a direction intersecting the axial direction of the output shaft. Thus, the uniaxial eccentric screw pump of the present invention can firmly connect the connecting shaft and the output shaft. In addition, in the uniaxial eccentric screw pump of the present invention, by removing the adapter from the output shaft, the shaft seal member can be removed from the output shaft or maintenance can be performed without performing a large-scale operation such as removing the output shaft from the drive machine. Therefore, the uniaxial eccentric screw pump of the present invention can connect the connecting shaft and the output shaft via the adapter in the driving-side connecting portion, and can easily perform maintenance and other operations.

The inventors of the present invention have made intensive studies and found that, when a member for maintaining sealability by a surface pressure generated by an urging force of a spring such as a mechanical seal is used as a shaft seal member, it is necessary to perform a positioning operation of the shaft seal member in a state of urging the shaft seal member by an assembling jig in order to adjust the urging force to an appropriate urging force at the time of assembling. However, in the case where the diameter-enlarged portion is integrally provided to the output shaft, the diameter-enlarged portion may become an obstacle, and the shaft seal member may be difficult to position, or a dedicated positioning jig may be required.

(2) In order to solve the problem, the uniaxial eccentric screw pump of the present invention is preferably characterized in that: in the second shaft coupling portion, the shaft seal member is positioned in the axial direction of the output shaft by abutting against the adapter enlarged diameter portion.

The uniaxial eccentric screw pump according to the present invention can position the shaft seal member with high accuracy with respect to the adapter enlarged diameter portion by adopting the above-described configuration. Thus, the uniaxial eccentric screw pump of the present invention can easily position the shaft seal member without providing a dedicated positioning jig or the like when the shaft seal member is mounted, and thus the assembly work is easy.

(3) The uniaxial eccentric screw pump of the present invention described above is preferably characterized in that: the second shaft coupling portion couples the adapter and the output shaft in a state in which a fitting structure is formed; the uniaxial eccentric screw pump includes at least one of an adapter releasing member for releasing the fitting structure of the second shaft coupling portion and an adapter releasing member setting portion for setting the adapter releasing member.

In the uniaxial eccentric screw pump according to the present invention, the adapter and the output shaft are coupled together in the fitting structure as described above, so that the operation for coupling and uncoupling the adapter and the output shaft can be performed in a state in which the axial displacement is less likely to occur. Further, the uniaxial eccentric screw pump of the present invention is provided with at least one of the adapter releasing member and the adapter releasing member installation portion as described above, and therefore, the operation for releasing the fitting structure of the adapter and the output shaft can be smoothly performed. Therefore, the uniaxial eccentric screw pump of the present invention can easily perform the disassembly operation in addition to the coupling operation of the adapter and the output shaft.

(4) The uniaxial eccentric screw pump of the present invention is preferably configured such that the fitting structure is fitted with a gap.

The uniaxial eccentric screw pump of the present invention can be easily disassembled and assembled by the fitting structure formed by the adapter and the output shaft by adopting the above-described configuration.

(5) The uniaxial eccentric screw pump of the present invention described above is preferably characterized in that: the adapter release member has a threaded shaft, and the adapter release member setting portion has a threaded receiving portion constituted by a hole or a recess having a thread screwed with the threaded shaft.

The uniaxial eccentric screw pump according to the present invention can be configured as described above, and can firmly set a member having a threaded shaft constituting the adapter releasing member by a screwing force generated between the member and a screw receiving portion constituting the adapter releasing member setting portion. Further, by rotating the screw shaft while screwing the screw shaft constituting the adapter releasing member with the screw receiving portion constituting the adapter releasing member setting portion, the screw shaft can be advanced and retracted in the axial direction, and the force generated thereby can be used for releasing the fitting structure. Therefore, the uniaxial eccentric screw pump of the present invention can sufficiently apply the force required for releasing the fitting of the fitting structure by screwing the threaded shaft constituting the adapter releasing member and the threaded receiving portion constituting the adapter releasing member setting portion.

(6) The uniaxial eccentric screw pump of the present invention described above is preferably characterized in that: the adapter has a recess for accommodating at least a part of the first shaft coupling portion, and a fixing member for fixing the adapter to the output shaft is provided inside the recess.

The uniaxial eccentric screw pump of the present invention may be used as a space for accommodating a fixing member for fixing the adapter to the output shaft, the recess being provided to accommodate at least a part of the first shaft coupling portion.

(7) The uniaxial eccentric screw pump of the present invention described above is preferably characterized in that: the second shaft coupling portion couples the adapter and the output shaft in a state in which a fitting structure is formed; the uniaxial eccentric screw pump may use the fixing member detached from a fixing portion of the adapter and the output shaft as an adapter releasing member for releasing the fitting structure of the second shaft coupling portion.

The uniaxial eccentric screw pump according to the present invention, by adopting the above-described configuration, can use the fixing member detached from the fixing portion as an adapter releasing member for releasing the fitting structure directly when the uniaxial eccentric screw pump is disassembled into the adapter and the output shaft. Therefore, the uniaxial eccentric screw pump of the present invention can expect effects such as reduction in the number of parts, reduction in cost accompanying the reduction, and improvement in workability, without providing an adapter release member separately from the fixing member.

(8) The uniaxial eccentric screw pump of the present invention described above is preferably characterized in that: the fixing part is provided with a threaded shaft; the adapter includes a screw receiving portion screwed with a screw shaft constituting the fixing member as the adapter releasing member setting portion; the adapter and the output shaft can be moved relatively in a direction to release the fitting structure of the second shaft coupling portion by screwing the fixing member, which is detached from the fixing portion of the adapter and the output shaft, as the adapter releasing member, with the screw receiving portion, which constitutes the adapter releasing member setting portion, and advancing toward the output shaft, so that the screw shaft and the output shaft can be brought into direct or indirect contact with each other.

With the above configuration, the uniaxial eccentric screw pump according to the present invention can apply a force generated by screwing the fixing member detached from the fixing portion between the adapter and the output shaft as the adapter releasing member and advancing toward the output shaft to the output shaft. Thus, the uniaxial eccentric screw pump of the present invention can release the fitting structure by using the force generated by rotating and advancing the threaded shaft.

(9) The uniaxial eccentric screw pump of the present invention described above is preferably characterized in that: the interior of the recess is arranged to be liquid-tight.

The uniaxial eccentric screw pump according to the present invention can prevent deterioration of the fluid in the concave portion due to inflow of the fluid into the concave portion or corrosion of the member disposed in the concave portion by the fluid by adopting the above-described configuration.

(10) The uniaxial eccentric screw pump of the present invention described above is preferably characterized in that: a connecting part structure provided at an end of the connecting shaft; the first shaft coupling portion is configured by fixing the coupling portion structure to the coupling shaft in a state in which an end portion of the coupling shaft is inserted into an insertion portion provided in the coupling portion structure; the recess has a sealing portion for sealing a gap between the insertion portion and the coupling shaft.

The uniaxial eccentric screw pump according to the present invention can prevent the fluid from flowing into the inside of the concave portion through the gap formed between the insertion portion provided in the coupling portion structure and the coupling shaft by adopting the above-described configuration. Thus, the uniaxial eccentric screw pump of the present invention can suppress deterioration of the fluid in the concave portion due to inflow of the fluid into the concave portion or corrosion of the member disposed in the concave portion by the fluid.

(effects of the invention)

According to the present invention, it is possible to provide a uniaxial eccentric screw pump in which the shaft seal member can be positioned and provided on the output shaft side with high accuracy when the connecting shaft and the output shaft are connected, and the connecting portion on the output side is configured to have a larger diameter than the output shaft, so that the connecting shaft and the output shaft can be firmly connected, and maintenance and the like of the shaft seal member can be easily performed.

Drawings

Fig. 1 is a cross-sectional view of a uniaxial eccentric screw pump according to an embodiment of the present invention.

Fig. 2 is an enlarged view of the vicinity of the drive-side connecting portion of the uniaxial eccentric screw pump of fig. 1.

Fig. 3 is an exploded perspective view showing a state in which a driving-side coupling portion of the uniaxial eccentric screw pump of fig. 1 is disassembled.

Fig. 4 is an exploded perspective view showing a drive shaft and a first shaft coupling portion of the uniaxial eccentric screw pump of fig. 1.

Fig. 5 is an exploded perspective view showing a state in which a driving-side coupling portion of the uniaxial eccentric screw pump of fig. 1 is disassembled.

Fig. 6 is a view showing a state of the adapter when the adapter is seen from the positioning end face side.

Fig. 7 is a view showing a state of the constituent body constituting the first shaft connecting section in front view.

Fig. 8 is an enlarged view of the vicinity of the rotor-side connecting portion of the uniaxial eccentric screw pump of fig. 1.

(symbol description)

10: single-shaft eccentric screw pump

20: stator

30: rotor

55: driving machine

56: driving shaft

60: shaft seal member

70: connecting shaft

100: drive side connecting part

110: first shaft connecting part

112: connecting part structure

116: flange part

118b: screw hole for non-connection (fitting release member installation part)

120: sealing part

122: insertion part

150: second shaft connecting part

160: adapter device

162x: adapter expanding portion

164: concave part

164e: concave threaded hole (adapter release component setting part)

168: adapter fixing bolt (adapter releasing component)

168s: screw shaft

170: connecting bolt (fitting releasing component)

170s: screw shaft

180: fitting structure

190: fitting structure

200: rotor side connecting part

210: first shaft connecting part

212: connecting part structure

250: second shaft connecting part

280: fitting structure

Detailed Description

Next, a uniaxial eccentric screw pump 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the overall structure of the uniaxial eccentric screw pump 10 will be described first, and then the drive-side coupling portion 100 and the rotor-side coupling portion 200 will be described in further detail.

Integral Structure concerning uniaxial eccentric screw Pump 10

As shown in fig. 1, the uniaxial eccentric screw pump 10 is a so-called rotary positive displacement pump, and as shown in fig. 1, a stator 20, a rotor 30, a power transmission mechanism 50, and the like are housed in a casing 12. The housing 12 is a metal cylindrical member, and a first opening 14a is provided in a circular plate-shaped End bolt (End student) 12a attached to one End side in the longitudinal direction. In addition, a second opening 14b is provided in the outer peripheral portion of the housing 12. The second opening 14b communicates with the inner space of the housing 12 at an intermediate portion 12d located at a longitudinal intermediate portion of the housing 12.

The first opening 14a and the second opening 14b are portions functioning as a suction port and a discharge port of the uniaxial eccentric screw pump 10, respectively. The uniaxial eccentric screw pump 10 of the present embodiment can pump a fluid (fluid) so that the first opening 14a functions as a discharge port and the second opening 14b functions as a suction port by rotating the rotor 30 in the forward direction. Further, the uniaxial eccentric screw pump 10 can pump fluid so that the first opening 14a functions as a suction port and the second opening 14b functions as a discharge port by reversely rotating the rotor 30. Hereinafter, unless otherwise specified, the uniaxial eccentric screw pump 10 will be described so as to operate with the first opening 14a functioning as a discharge port and the second opening 14b functioning as a suction port.

The stator 20 is a member having a cylindrical external shape. The stator 20 is made of, for example, an elastomer, a resin, a metal, or a ceramic. The material constituting the stator 20 is appropriately selected according to the type, property, etc. of the object (fluid) to be conveyed by the uniaxial eccentric screw pump 10. The stator 20 is accommodated in the housing 12 inside the stator mounting portion 12b located adjacent to the first opening 14 a. The outer diameter of the stator 20 is substantially the same as the inner diameter of the stator mounting portion 12 b. Therefore, the stator 20 is mounted in a state in which the outer peripheral surface thereof is substantially in close contact with the inner peripheral surface of the stator mounting portion 12 b. The flange portion 20a located at one end side is clamped to the end portion of the housing 12 by the end bolt 12a, and the support bolt 16 is attached and tightened across the end bolt 12a and the main body portion of the housing 12, thereby fixing the stator 20. Therefore, the stator 20 does not shift in position or the like in the stator mounting portion 12b of the housing 12. The inner peripheral surface 24 of the stator 20 is formed in n single-stage or multi-stage female screw shapes. In the present embodiment, two multi-stage female thread shapes are formed as shown in fig. 1 and 2.

The rotor 30 is constituted by a male screw type shaft body. The rotor 30 is formed of a material such as metal or ceramic. The material constituting the rotor 30 is appropriately selected according to the type, property, etc. of the object (fluid) to be conveyed. The rotor 30 is formed in n-1 single-stage or multi-stage male screw shapes. In the present embodiment, the rotor 30 is formed in a multi-stage male screw shape. The rotor 30 is a shaft body (a shaft to be connected) connected to a connecting shaft 70 described in detail later. The rotor 30 is coupled to the coupling shaft 70 (coupling shaft) via a rotor-side coupling portion 200. The rotor 30 eccentrically rotates by power transmitted through the coupling shaft 70. The rotor 30 is formed as: the cross-sectional shape is substantially circular when sectioned at any position in the longitudinal direction. The rotor 30 is inserted into the through hole 22 formed in the stator 20, and is capable of freely eccentrically rotating in the through hole 22.

When the rotor 30 is inserted into the stator 20, the outer peripheral surface 32 of the rotor 30 and the inner peripheral surface 24 of the stator 20 are in contact with each other at a tangential line (seal line) therebetween. Thus, a separate series of closed spaces called cavities 34 are formed between the inner peripheral surface 24 of the stator 20 in which the through holes 22 are formed and the outer peripheral surface of the rotor 30. The cavity 34 forms a fluid delivery path 40 for delivering a fluid as an object to be delivered. When the length L of the lead wire of the stator 20 or the rotor 30 is set to the reference length S, the fluid transport path 40 is a multi-stage (d-stage) flow path having a length d times the reference length S of the lead wire in the axial direction of the stator 20 or the rotor 30.

The fluid transport path 40 extends spirally along the longitudinal direction of the stator 20 or the rotor 30. When the rotor 30 is rotated in the through hole 22 of the stator 20, the fluid transport path 40 advances in the longitudinal direction of the stator 20 while rotating in the stator 20. Therefore, when the rotor 30 is rotated, the fluid can be sucked into the fluid transport path 40 from one end side of the stator 20, transported to the other end side of the stator 20 in a state of being enclosed in the fluid transport path 40, and discharged to the other end side of the stator 20. That is, when the rotor 30 is rotated in the forward direction, the fluid sucked from the second opening 14b can be pumped and discharged from the first opening 14 a. When the rotor 30 is rotated in the reverse direction, the fluid sucked from the first opening 14a can be discharged from the second opening 14 b.

The power transmission mechanism 50 is provided for transmitting power from a drive motor 55 such as a motor provided outside the housing 12 to the rotor 30. The power transmission mechanism 50 has a power connection portion 52 and an eccentric rotation portion 54. The power connection portion 52 is provided in the shaft housing portion 12c, wherein the shaft housing portion 12c is provided at one end side in the longitudinal direction of the housing 12, and more specifically, is provided at a side opposite to the side where the end bolt 12a and the stator mounting portion 12b are provided (hereinafter, also simply referred to as "base end side"). The eccentric rotation portion 54 is provided in the intermediate portion 12d formed between the shaft housing portion 12c and the stator mounting portion 12 b.

The power connection 52 has a drive shaft 56. The drive shaft 56 is rotatably supported by two bearings 56a and 56 b. The drive shaft 56 is taken out from the closed portion on the base end side of the housing 12 to the outside. The drive shaft 56 is connected to the drive motor 55. Therefore, by operating the driver 55, the drive shaft 56 can be rotated. That is, the drive shaft 56 is a shaft body that functions as an output shaft that receives the output of the drive motor 55 and rotates.

A shaft seal member 60 is provided between the shaft housing portion 12c provided with the power connecting portion 52 and the intermediate portion 12 d. The shaft seal member 60 is provided so that the fluid as the object to be conveyed does not leak from the intermediate portion 12d side to the shaft housing portion 12c side. The shaft seal member 60 may be constituted by, for example, a mechanical seal, a gland packing, or the like. In the present embodiment, a mechanical seal is used as the shaft seal member 60. The shaft seal member 60 is attached to the drive shaft 56 (output shaft).

The eccentric rotation portion 54 connects the drive shaft 56 and the rotor 30 to each other so as to be able to transmit power. The eccentric rotation portion 54 has a coupling shaft 70. The coupling shaft 70 is formed of a flexible shaft body. In the present embodiment, the coupling shaft 70 is constituted by a flexible rod. The coupling shaft 70 is coupled to the drive shaft 56 via a drive-side coupling portion 100 at one end side (base end side) in the longitudinal direction. The coupling shaft 70 is coupled to the rotor 30 via a rotor-side coupling portion 200 at the other end (tip end) in the longitudinal direction. With such a configuration, the eccentric rotation portion 54 can transmit the rotational power transmitted from the drive motor 55 via the drive shaft 56 to the rotor 30, and eccentrically rotate the rotor 30.

Regarding the drive side connecting portion 100

Next, the driving-side coupling unit 100 will be described. As shown in fig. 1 and 2, the driving-side coupling portion 100 is a portion that directly or indirectly couples the coupling shaft 70 as a first shaft, the driving shaft 56 as a second shaft, and these shafts so as to be connected in the axial direction. The driving-side coupling portion 100 is formed by being detachably coupled in a state where a fitting structure 180 is formed by the first shaft coupling portion 110 located at one end side (base end side) of the coupling shaft 70 and the second shaft coupling portion 150 located at the end portion (tip end side) of the driving shaft 56.

As shown in fig. 2 to 4, the first shaft coupling portion 110 may be integrally formed as a part of the coupling shaft 70 by machining an end portion of the coupling shaft 70, but in the present embodiment, the coupling portion structure 112 formed separately from the coupling shaft 70 is attached to the coupling shaft 70. The connecting portion structure 112 includes a structure body 114, a flange 116, a screw hole 118, and a seal 120.

The constituent body 114 is a cylindrical portion connected to an end of the coupling shaft 70. An insertion portion 122 is provided at the axial center position of the constituent body main body 114. The insertion portion 122 is formed of a hole into which the end portion of the coupling shaft 70 is inserted. The insertion portion 122 is formed so that the end portion of the coupling shaft 70 can be inserted with substantially no gap.

The flange 116 is a flange-like portion that extends in a direction intersecting the axial direction of the coupling shaft 70 inserted into the insertion portion 122. The flange 116 is provided over the entire circumference of the constituent body 114. The flange 116 is provided so as to extend radially outward at an axial intermediate portion of the constituent body main body 114.

The screw hole 118 is a hole having a screw thread on an inner peripheral surface thereof, which is screwed with a connecting bolt 170 described later. The screw hole 118 is formed so as to penetrate the flange 116 in the axial direction. As shown in fig. 4 and 8, a plurality of screw holes 118 are provided in a direction around the axis of the constituent body main body 114. A part of the plurality of screw holes 118 is provided at a position corresponding to a screw hole 162c provided in the second shaft coupling portion 150 (hereinafter, also referred to as "coupling screw hole 118 a"), and the other part is provided at a position not corresponding to the screw hole 162c (hereinafter, also referred to as "non-coupling screw hole 118 b").

The coupling screw hole 118a is a member used when the first shaft coupling portion 110 and the second shaft coupling portion 150 are coupled by the coupling bolt 170. The coupling screw holes 118a are provided in a plurality (eight in the present embodiment) at substantially equal intervals in the direction around the axis of the constituent body main body 114.

The non-coupling screw hole 118b constitutes a fitting canceling member setting portion that sets a fitting canceling member for canceling the fitting structure constituted by the first shaft coupling portion 110 and the second shaft coupling portion 150. In the present embodiment, as described later, the connection bolt 170 is used as the fitting canceling member. Therefore, the non-coupling screw hole 118b is formed to have a screw thread on the inner peripheral surface that can be screwed with the screw shaft 170s of the coupling bolt 170, similarly to the coupling screw hole 118 a. The non-coupling screw hole 118b is provided at a position offset from the coupling screw hole 118a in a direction around the axis of the constituent body main body 114. The non-coupling screw holes 118b are provided in a plurality (two in the present embodiment) at positions symmetrical with respect to the axial center of the constituent body main body 114. In the present embodiment, a dummy bolt 171 for plugging the hole is inserted into the non-coupling screw hole 118b except for the disassembly operation.

The seal portion 120 is a member that seals to prevent leakage of fluid through a gap between the insertion portion 122 provided in the constituent body main body 114 and the coupling shaft 70. As shown in fig. 2 and 3, the sealing portion 120 has a sealing member 126 and a cover member 128.

The sealing member 126 is constituted by, for example, an O-ring, a gasket, or the like. In the present embodiment, an O-ring having a diameter larger than the opening diameter of the insertion portion 122 is provided as the sealing member 126. The seal member 126 is disposed so as to surround a circular opening region constituting the insertion portion 122.

The cover member 128 is a member that sandwiches the sealing member 126 between it and the end surface of the constituent body main body 114. The cover member 128 is a plate-like member that is larger than the opening area of the insertion portion 122 provided in the constituent body main body 114, and is attached so as to cover the entire opening area of the insertion portion 122. The cover member 128 is fixed to the end of the coupling shaft 70 inserted into the insertion portion 122 by a cover fixing bolt 130 in a state where the sealing member 126 is disposed between the end surface of the constituent body main body 114. Thereby, the cover member 128 is fixed via the seal member 126 so as to be along the end face of the constituent body main body 114. By thus attaching the cover member 128, the sealing portion 120 is provided so as to surround the opening area of the insertion portion 122 with the sealing member 126, and the sealing member 126 is sandwiched between the end face of the constituent body main body 114 and the cover member 128.

The first shaft coupling portion 110 is formed as: by providing the above-described constituent body 114 at the end of the coupling shaft 70, the constituent body 114 has a convex portion 140 protruding in the axial direction of the coupling shaft 70 toward the distal end side than the flange portion 116, with the flange portion 116 being defined. The convex portion 140 is combined with a concave portion 164 of the second shaft coupling portion 150 described later to form a fitting structure 180. The convex portion 140 is formed in a cylindrical shape.

As shown in fig. 2, 3, and 5, the second shaft coupling portion 150 is provided in the driving side coupling portion 100 on the driving shaft 56 constituting the second shaft. The second shaft coupling portion 150 may be integrally formed as a part of the drive shaft 56 by machining an end portion of the drive shaft 56, but in the present embodiment, the drive shaft 56 is mounted on an adapter 160 formed separately from the drive shaft 56 in a state in which a fitting structure is formed.

As shown in fig. 1 and 2, the adapter 160 is provided in a detachable manner with respect to the shaft seal member 60 attached to the drive shaft 56 at a position biased toward the axial end side of the drive shaft 56. As shown in fig. 2, 5, and 6, the adapter 160 includes a connecting portion 162, a recess 164, and a shaft fitting portion 166.

The connection portion 162 is a portion for connecting with the flange portion 116 of the first shaft connecting portion 110. In the present embodiment, the connecting portion 162 also constitutes a portion of the expanded diameter portion (the adapter expanded diameter portion 162 x) that bulges out in a direction (hereinafter also referred to as a "radial direction") intersecting the axial direction of the drive shaft 56 as compared with the drive shaft 56 in a state of being attached to the drive shaft 56. The connecting portion 162 is formed to have the same size as the flange portion 116 of the first shaft coupling portion 110 in the radial direction. The connecting portion 162 has a connecting end surface 162a located on one side in the axial direction of the adapter 160, and a positioning end surface 162b located on the other side in the axial direction.

The connection end surface 162a is a portion that comes into surface contact with the flange portion 116 of the first shaft coupling portion 110 in a state where the driving-side coupling portion 100 is formed. In the connection portion 162, a plurality of (eight in the present embodiment) screw holes 162c provided so as to open at the connection end face 162a are provided at equal intervals in the direction around the axial center of the adapter 160. The screw hole 162c is provided at a position corresponding to the coupling screw hole 118a provided in the flange portion 116 of the first shaft coupling portion 110.

The positioning end surface 162b is a surface facing the shaft seal member 60 provided on the drive shaft 56 in the state of constituting the drive side coupling portion 100. The shaft seal member 60 is mounted in a state of being positioned with reference to the positioning end surface 162b by abutting against the positioning end surface 162 b.

The recess 164 is a concave portion that accommodates at least a part of the first shaft connecting portion 110. In the present embodiment, the recess 164 is formed so as to be able to accommodate and fit the protrusion 140 of the first shaft coupling portion 110. Specifically, the concave portion 164 has an inner diameter substantially equal to the outer diameter of the convex portion 140, and is formed in a concave shape recessed in the axial direction from the connection end surface 162a of the connection portion 162. The depth of the concave portion 164 (the length in the axial direction from the connecting end surface 162 a) is equal to or greater than the protruding amount of the convex portion 140 of the first shaft coupling portion 110 (the protruding length in the axial direction from the flange portion 116). In the present embodiment, considering the amount of protrusion of the bolt head 168h of the adapter fixing bolt 168 for fixing the adapter 160 to the drive shaft 56, the amount of protrusion of the bolt head 130h of the cover fixing bolt 130 of the first shaft coupling portion 110, and the like, the depth of the concave portion 164 is set to be greater than the amount of protrusion of the convex portion 140 by an amount equal to or greater than the amounts of protrusion of the bolt heads 168h, 130 h. With such a configuration, in the driving-side coupling portion 100, the concave portion 164 and the convex portion 140 can be fitted by clearance fitting so as to form a nested (concave-convex fitting, i.e., an inch) structure, and the coupling shaft 70 can be coupled to the driving shaft 56 in a state in which the coupling end surface 162a of the coupling portion 162 is in surface contact with the flange portion 116.

The recess 164 has an inner peripheral surface 164a and a partition wall 164b intersecting the inner peripheral surface 164 a. The inner peripheral surface 164a is provided with a concave sealing member 164c. The concave portion sealing member 164c is a member that seals between the outer peripheral surface and the inner peripheral surface 164a of the convex portion 140 in a state where the convex portion 140 of the first shaft coupling portion 110 is inserted into the concave portion 164. The concave portion sealing member 164c is formed of an O-ring.

The partition 164b is a wall surface that separates the recess 164 from a shaft fitting portion 166 provided at a position offset from the recess in the axial direction of the adapter 160. As shown in fig. 6, the partition 164b is provided with a bolt insertion hole 164d. The bolt insertion holes 164d are holes for inserting adapter fixing bolts 168 (fixing members) for fixing the adapter 160 to the drive shaft 56. The bolt insertion hole 164d is formed to extend in the axial direction of the adapter 160 and reach the shaft fitting portion 166 from the recess 164. The bolt insertion hole 164d is provided at a position corresponding to the bolt hole 56x provided in the drive shaft 56.

Here, as shown in fig. 2 and 5, the bolt hole 56x is a hole that is opened in an end surface of the drive shaft 56, extends in the axial direction, and has a screw thread formed on an inner peripheral surface. A plurality of (six in the present embodiment) bolt holes 56x are provided at substantially equal intervals in the direction around the axial center of the drive shaft 56. A plurality of (six in the present embodiment) bolt insertion holes 164d are provided at equal intervals in the axial direction at positions corresponding to the bolt holes 56x provided in the drive shaft 56.

As shown in fig. 6, the partition 164b is provided with a recessed screw hole 164e (an adapter releasing member installation portion) in addition to the bolt insertion hole 164 d. The recess screw hole 164e is formed to extend in the axial direction of the adapter 160, like the bolt insertion hole 164d, and reaches the shaft fitting portion 166 from the recess 164. A screw thread that is screwed with a screw shaft 168s of an adapter fixing bolt 168 for fixing the adapter 160 is formed on the inner peripheral surface of the recessed screw hole 164 e. Accordingly, by inserting the adapter fixing bolt 168 into the recess screw hole 164e from the recess 164 side and rotating the adapter fixing bolt 168 in a state where the screw shaft 168s is screwed, the screw shaft 168s can be advanced toward the shaft fitting portion 166.

As shown in fig. 2, the shaft fitting portion 166 is provided on the opposite side (the other side in the axial direction) of the recess 164 located on one side in the axial direction of the adapter 160 via the partition wall 164 b. The shaft fitting portion 166 is formed as: the drive shaft 56 is inserted and fitted into the adapter 160 and has a concave shape in the axial direction. The shaft fitting portion 166 is configured to be capable of inserting the drive shaft 56 so as to form a nested structure.

The second shaft coupling portion 150 is configured in a state in which the drive shaft 56 is inserted into the shaft fitting portion 166 of the adapter 160 via a sealing member (in the present embodiment, an O-ring 163) to form a fitting structure 190. The adapter 160 is fixed to the end of the drive shaft 56 by connecting an adapter fixing bolt 168 inserted into the bolt insertion hole 164d from the recess 164 to the bolt hole 56x via a washer 167 and a disk-shaped plate 169 having a hole at a position corresponding to the bolt insertion hole 164d in a state where the bolt insertion hole 164d is aligned with the bolt hole 56x of the drive shaft 56. By attaching the adapter 160 to the drive shaft 56 in this manner, the shaft seal member 60 attached to the drive shaft 56 is brought into contact with the positioning end surface 162b of the connecting portion 162 constituting the adapter 160. Thereby, the shaft seal member 60 is fixed in a state of being positioned in the axial direction of the drive shaft 56 with the positioning end surface 162b as a reference. In the present embodiment, since the mechanical seal is used, the fixed ring and the rotating ring of the mechanical seal can be positioned in a state of being pressed against each other with an appropriate force capable of maintaining the sliding surface pressure.

The second shaft coupling portion 150 can rotate the adapter fixing bolt 168 and advance the adapter fixing bolt 168 toward the shaft fitting portion 166 in a state in which the adapter fixing bolt 168 is removed from the bolt insertion hole 164d and the bolt hole 56x and replaced with the recess screw hole 164 e. Accordingly, the pressing force in the axial direction can be applied from the adapter fixing bolt 168 to the drive shaft 56, and the adapter 160 and the drive shaft 56 can be moved relative to each other in a direction to release the fitting structure 190. That is, in the present embodiment, the adapter fixing bolt 168 for fixing the adapter 160 can be used as an adapter releasing member for releasing engagement between the adapter 160 and the drive shaft 56.

The driving-side coupling portion 100 is configured by fitting and coupling the first shaft coupling portion 110 and the second shaft coupling portion 150. Specifically, when the coupling shaft 70 and the drive shaft 56 are coupled, the protruding portion 140 of the first shaft coupling portion 110 is inserted into the recessed portion 164 of the second shaft coupling portion 150 to form the fitting structure 180. The first shaft coupling portion 110 and the second shaft coupling portion 150 can be coupled by bringing the flange portion 116 into surface contact with the coupling portion 162 and inserting the threaded shaft 170s of the coupling bolt 170 into engagement with the coupling screw hole 118a provided in the flange portion 116 and the screw hole 162c provided in the coupling portion 162.

When the coupling shaft 70 and the drive shaft 56 are disassembled, the coupling bolt 170 is removed from the coupling screw hole 118a and the screw hole 162c in the drive-side coupling portion 100. The removed connecting bolt 170 is connected to the non-connection screw hole 118b provided in the flange portion 116 of the first shaft connection portion 110. When the connecting bolt 170 is further rotated in this state, the threaded shaft 170s of the connecting bolt 170 protrudes toward the connecting portion 162 of the second shaft coupling portion 150. Accordingly, the screw shaft 170s presses the connection end surface 162a to move the first shaft coupling portion 110 and the second shaft coupling portion 150 relatively in the axial direction so as to be separated from each other, and the fitting structure 180 including the convex portion 140 and the concave portion 164 is released. In this way, the coupling and fitting structure 180 of the first shaft coupling portion 110 and the second shaft coupling portion 150 is released, and the driving-side coupling portion 100 is separated into the coupling shaft 70 and the driving shaft 56.

Regarding the rotor-side connecting portion 200

Next, the rotor-side connecting portion 200 will be described. The rotor-side coupling portion 200 is identical to the drive-side coupling portion 100 in that the coupling shaft 70 is the first shaft, like the drive-side coupling portion 100 described above, and is different in that the rotor 30 is the second shaft. As shown in fig. 8, the rotor-side coupling portion 200 is a portion that directly or indirectly couples the coupling shaft 70 and the rotor 30 to each other in the axial direction. The rotor-side coupling portion 200 is formed by being detachably coupled in a state where a fitting structure 280 is formed by a first shaft coupling portion 210 located at the other end side (front end side) of the coupling shaft 70 and a second shaft coupling portion 250 located at the end portion (front end side) of the rotor 30. In the following description, the same components as those of the driving-side coupling unit 100 are given the same reference numerals, and detailed description thereof is omitted. In the following description, the configuration of each portion constituting the rotor-side coupling portion 200 is appropriately compared with each portion provided in the drive-side coupling portion 100.

As shown in fig. 4 and 8, the first shaft coupling portion 210 is formed to have substantially the same configuration as the first shaft coupling portion 110 provided on one end side (base end side) of the coupling shaft 70. Specifically, the first shaft coupling portion 210 may be integrally formed as a part of the coupling shaft 70 by machining an end portion of the coupling shaft 70, but in the present embodiment, the coupling portion structure 212 formed separately from the coupling shaft 70 is attached to the coupling shaft 70. Here, the connecting portion structure 212 has the same structure as the connecting portion structure 112 described above in that it includes the structure body 114, the flange 116, and the screw hole 118. On the other hand, the coupling portion structure 212 is different from the first shaft coupling portion 110 in that it does not include the seal portion 120. The constituent body main body 114, the flange portion 116, and the screw hole 118 constituting the coupling portion constituent 212 are the same as those of the first shaft coupling portion 110, and therefore, detailed description thereof will be omitted.

As shown in fig. 8, the second shaft coupling portion 250 is provided in the rotor-side coupling portion 200 on the rotor 30 constituting the second shaft. The second shaft coupling portion 250 may be constituted by an adapter or the like formed separately from the rotor 30 as the second shaft, like the second shaft coupling portion 150 provided in the driving side coupling portion 100, but in the present embodiment, the end portion of the rotor 30 is formed as a part of the rotor 30 by machining. The second shaft coupling portion 250 has a connecting portion 262 and a recess 264.

The connection portion 262 is a portion for connecting with the flange portion 116 constituting the first shaft connecting portion 210. The connecting portion 262 is formed to have the same size as the flange portion 116 of the first shaft coupling portion 210 in the radial direction. The connecting portion 262 has a connecting end surface 262a that comes into surface contact with the flange portion 116 of the first shaft coupling portion 210 in a state where the rotor-side coupling portion 200 is formed. In the connecting portion 262, a plurality of (eight in the present embodiment) screw holes 262c provided so as to open at the connecting end face 262a are provided at equal intervals in the axial direction. The screw hole 262c is provided at a position corresponding to the coupling screw hole 118a provided in the flange portion 116 of the first shaft coupling portion 210.

The recess 264 is a recessed portion that accommodates at least a portion of the first shaft coupling portion 210. In the present embodiment, the recess 264 is formed so as to be able to accommodate and fit the protrusion 140 of the first shaft coupling portion 210. Specifically, the concave portion 264 has an inner diameter substantially equal to the outer diameter of the convex portion 140, and is formed in a concave shape recessed in the axial direction from the connecting end surface 262a of the connecting portion 262. The depth of the concave portion 264 (the length in the axial direction from the connecting end surface 262 a) is equal to or greater than the protruding amount of the convex portion 140 of the first shaft coupling portion 210. With such a configuration, the rotor-side coupling portion 200 can be fitted so that the concave portion 264 and the convex portion 140 form a nested structure, and the coupling shaft 70 can be coupled to the rotor 30 in a state in which the coupling end surface 262a of the coupling portion 262 is in surface contact with the flange portion 116.

The rotor-side coupling portion 200 is configured by fitting and coupling the first shaft coupling portion 210 and the second shaft coupling portion 250. Specifically, when the coupling shaft 70 and the rotor 30 are coupled, the protruding portion 140 of the first shaft coupling portion 210 is inserted into the recessed portion 264 of the second shaft coupling portion 250 to form the fitting structure 280. The flange portion 116 of the first shaft coupling portion 210 is brought into surface contact with the connecting portion 262 of the second shaft coupling portion 250, and the threaded shaft 170s of the connecting bolt 170 is inserted into the connecting screw hole 118a and the screw hole 262c provided in the connecting portion 262 to be screwed, whereby the first shaft coupling portion 210 and the second shaft coupling portion 250 can be coupled.

When the coupling shaft 70 and the rotor 30 are disassembled, the coupling bolt 170 is removed from the screw hole 262c in the rotor-side coupling portion 200, and the dummy bolt 171 attached to the non-coupling screw hole 118b is removed. The removed connecting bolt 170 is connected to the non-connection screw hole 118b provided in the flange portion 116 of the first shaft connection portion 210. When the connecting bolt 170 is further rotated in this state, the threaded shaft 170s protrudes toward the connecting portion 262 of the second shaft coupling portion 250. Accordingly, the screw shaft 170s presses the connecting end surface 262a to move the first shaft coupling portion 210 and the second shaft coupling portion 250 relatively in the axial direction so as to be separated from each other, and the fitting structure 280 formed by the convex portion 140 and the concave portion 264 is released. In this way, the coupling and fitting structure 280 of the first shaft coupling portion 210 and the second shaft coupling portion 250 is released, and the driving side coupling portion 200 is separated into the coupling shaft 70 and the rotor 30.

The uniaxial eccentric screw pump 10 of the present embodiment has the above-described characteristic configuration, and therefore can achieve the following effects.

(A) As described above, the uniaxial eccentric screw pump 10 of the present embodiment includes: the uniaxial eccentric screw pump 10 includes a flexible coupling shaft 70, a rotor 30 formed of a male screw-type shaft body, and a stator 20 having an inner peripheral surface formed into a female screw-type shape, wherein the rotor 30 is capable of being inserted into the stator 20, and the uniaxial eccentric screw pump 10 includes a driving-side coupling portion 100, and the driving-side coupling portion 100 is formed by directly or indirectly coupling first shaft coupling portions 110 and 210 provided on the coupling shaft 70 and second shaft coupling portions 150 and 250 provided on a drive shaft 56 that receives an output of the drive machine 55 and rotates. In addition, the uniaxial eccentric screw pump 10 is characterized in that: the shaft seal member 60 is provided on the drive shaft 56, and the second shaft coupling portion 150 is configured by attaching an adapter 160 that is attachable to and detachable from the drive shaft 56 to the drive shaft 56 at a position that is closer to the axial end portion side of the drive shaft 56 than the shaft seal member 60, and the adapter 160 has an adapter enlarged diameter portion 162x that bulges in a direction intersecting the axial direction of the drive shaft 56 than the drive shaft 56.

The uniaxial eccentric screw pump 10 is configured to: by attaching the adapter 160 having the adapter enlarged diameter portion 162x to the drive shaft 56 as in (a) above, the coupling shaft 70 and the drive shaft 56 are coupled via the adapter enlarged diameter portion 162x that is enlarged in diameter from the drive shaft 56. Thereby, the uniaxial eccentric screw pump 10 can firmly couple the coupling shaft 70 and the drive shaft 56.

Further, the uniaxial eccentric screw pump 10 is configured as in (a) above, and therefore, even if a large-scale operation such as detaching the drive shaft 56 from the drive machine 55 is not performed, the shaft seal member 60 can be detached from the drive shaft 56 or maintenance can be performed by detaching the adapter 160 from the drive shaft 56. Therefore, the uniaxial eccentric screw pump 10 can connect the connecting shaft 70 and the drive shaft 56 via the adapter 160 in the drive-side connecting portion 100, and can easily perform operations such as positioning the shaft seal member 60 with respect to the drive shaft 56, and maintenance of the shaft seal member 60.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (a) described above, but the present invention is not limited to this, and the structure may be appropriately modified within a range not departing from the gist of the present invention. In addition, the uniaxial eccentric screw pump 10 shows the following example: that is, the adapter 160 configured as described above is attached to the drive shaft 56 in the second shaft coupling portions 150 and 250 to configure the second shaft coupling portion 150, and the second shaft coupling portion 250 is not configured by the adapter 160, but the present invention is not limited thereto. The structure can be as follows: the second shaft coupling portion 250 is also provided with an adapter 160 in the same manner as the second shaft coupling portion 150 described above, except for the second shaft coupling portion 150. In addition, the structure may be as follows: as with the adapter enlarged diameter portion 162x of the second shaft coupling portion 150, the second shaft coupling portion 250 is also provided with an enlarged diameter portion that bulges out in a direction intersecting the axial direction of the rotor 30 with respect to the rotor 30.

(B) The uniaxial eccentric screw pump 10 of the present embodiment is configured as follows: in the second shaft coupling portion 150, the shaft seal member 60 is positioned in the axial direction of the drive shaft 56 by abutting against the adapter enlarged diameter portion 162 x. With such a configuration, the uniaxial eccentric screw pump 10 can accurately position the shaft seal member 60 with reference to the adapter enlarged diameter portion 162 x. As a result, the uniaxial eccentric screw pump 10 of the present embodiment does not require a countermeasure for positioning the shaft seal member 60 such as using a dedicated positioning jig when the shaft seal member 60 is attached, and therefore, the assembling work is easy.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (B) described above, but the present invention is not limited to this, and may not have the structure (B) described above. For example, the uniaxial eccentric screw pump 10 may be configured to: instead of the adapter enlarged diameter portion 162x, the shaft seal member 60 can be positioned by another member.

(C) The uniaxial eccentric screw pump 10 of the present embodiment is formed as described above: the second shaft coupling portions 150 and 250 couple the adapter 160 and the drive shaft 56 in a state where the fitting structure 190 is formed; an adapter fixing bolt 168 as an adapter releasing member for releasing the fitting structure 190 of the second shaft coupling portion 150, and a recessed screw hole 164e as an adapter releasing member setting portion for setting the adapter fixing bolt 168. With such a configuration, the uniaxial eccentric screw pump 10 can perform a work for coupling and uncoupling the adapter 160 and the drive shaft 56 in a state where the axial displacement is less likely to occur. Further, since the uniaxial eccentric screw pump 10 has the adapter fixing bolt 168 and the concave screw hole 164e, the operation for releasing the fitting structure 190 of the adapter 160 and the drive shaft 56 can be smoothly performed. Therefore, the uniaxial eccentric screw pump 10 of the present embodiment can easily perform the coupling operation between the adapter 160 and the drive shaft 56, and can easily perform the disassembling operation.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (C) described above, but the present invention is not limited to this, and may not have the structure (C) described above. The uniaxial eccentric screw pump 10 includes both the adapter fixing bolt 168 as the adapter releasing member of the releasing fitting structure 190 and the concave screw hole 164e as the adapter releasing member setting portion for setting the adapter fixing bolt 168, but the present invention is not limited to this, and may be formed, for example, as follows: the adaptor fixing bolts 168 are not provided, and other bolts not constituting the uniaxial eccentric screw pump 10 are attached as adaptor release members to the recess screw holes 164e to release the fitting structure 190.

(D) The uniaxial eccentric screw pump 10 of the present embodiment is formed as described above: the fitting structure 190 is formed by gap fitting. Accordingly, the uniaxial eccentric screw pump 10 can easily disassemble and assemble the fitting structure 190 constituted by the adapter 160 and the drive shaft 56.

In the present embodiment, the fitting structure 190 is configured by the gap fitting, but the present invention is not limited to this, and the fitting may be performed by a method other than the gap fitting.

(E) The uniaxial eccentric screw pump 10 of the present embodiment is formed as described above: the adapter fixing bolt 168 has a threaded shaft 168s, and the recess screw hole 164e has a screw thread screwed with the threaded shaft 168 s. Since the uniaxial eccentric screw pump 10 is configured as described above, the adaptor fixing bolt 168 can be firmly provided by the screwing force generated between the adaptor fixing bolt 168 and the concave screw hole 164 e. Further, by rotating the screw shaft 168s while screwing the screw shaft 168s with the recess screw hole 164e, the screw shaft 168s can be advanced and retracted in the axial direction, and the force generated thereby can be used to release the fitting structure 190. Accordingly, the uniaxial eccentric screw pump 10 can sufficiently apply the force required for releasing the fitting structure 190 by screwing the screw shaft 168s into the concave screw hole 164 e.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (E) described above, but the present invention is not limited to this, and may not have the structure (E) described above. For example, the uniaxial eccentric screw pump 10 may employ a shaft body having no screw thread or another member having a shaft-like portion as the adapter releasing member instead of the screw shaft 168s, and may employ a through hole having no screw thread as the adapter releasing member mounting portion instead of the concave portion screw hole 164 e. In the case of adopting such a configuration, the uniaxial eccentric screw pump 10 can release the fitting structure 190 by inserting a shaft body or the like used as the adapter release member into the through hole used as the adapter release member installation portion, and applying a pressing force to the shaft body in the axial direction in this state.

(F) The uniaxial eccentric screw pump 10 of the present embodiment is formed as described above: the adapter 160 has a recess 164 for accommodating at least a part of the first shaft coupling portion 110, and an adapter fixing bolt 168 for fixing the adapter 160 to the drive shaft 56 is provided inside the recess 164. Since the uniaxial eccentric screw pump 10 is configured such that the recess 164 provided for accommodating the first shaft coupling portion 110 as described above can be flexibly used as a space for accommodating the adapter fixing bolt 168, the exposure of the members to the outside of the adapter 160 can be minimized.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (F) described above, but the present invention is not limited to this, and may not have the structure (F) described above. For example, the uniaxial eccentric screw pump 10 may be configured such that the adapter fixing bolt 168 is disposed outside the recess 164, not inside the recess 164.

(G) The uniaxial eccentric screw pump 10 of the present embodiment is formed as described above: the second shaft coupling portion 150 couples the adapter 160 and the drive shaft 56 in a state where the fitting structure 190 is formed; the adapter fixing bolt 168 detached from the fixing portion of the adapter 160 and the drive shaft 56 can be used as an adapter releasing member for releasing the fitting structure 190 of the second shaft coupling portion 150. By adopting such a configuration, the uniaxial eccentric screw pump 10 can directly and flexibly use the adapter fixing bolt 168 detached from the fixing portion as an adapter releasing member for releasing the fitting structure 190 when the adapter 160 and the drive shaft 56 are separated. Therefore, the uniaxial eccentric screw pump 10 does not need to provide an adapter release member separately from the adapter fixing bolt 168, and for example, effects such as reduction in the number of components, reduction in cost accompanying this, and improvement in workability can be expected.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (G) described above, but the present invention is not limited to this, and may not have the structure (G) described above. That is, the uniaxial eccentric screw pump 10 may be configured as: instead of using the adapter fixing bolt 168 as an adapter releasing member, a member such as a bolt different from the adapter fixing bolt 168 is provided as an adapter releasing member.

(H) The uniaxial eccentric screw pump 10 of the present embodiment is formed as: the adapter fixing bolt 168 has a threaded shaft 168s, the adapter 160 has a recessed screw hole 164e screwed to the threaded shaft 168s, and the adapter fixing bolt 168 detached from the fixing portion of the adapter 160 and the drive shaft 56 is screwed to the recessed screw hole 164e and advanced toward the drive shaft 56, whereby the threaded shaft 168s can be brought into direct contact with the drive shaft 56, and the adapter 160 and the drive shaft 56 can be moved relatively in a direction to release the fitting structure 190 in the second shaft coupling portion 150. The uniaxial eccentric screw pump 10 is configured as described above, and therefore, the fitting structure 190 can be released by a force generated by advancing the screw shaft 168s by rotating it.

The uniaxial eccentric screw pump 10 of the present embodiment adopts the configuration (H) described above, but the present invention is not limited to this, and may not have the configuration (H) described above.

(I) The uniaxial eccentric screw pump 10 of the present embodiment is formed such that the inside of the recess 164 is liquid-tight. As a result, the uniaxial eccentric screw pump 10 can suppress degradation of the fluid in the recess 164 due to the inflow of the fluid into the recess 164 or corrosion of the member disposed in the recess 164 by the fluid.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (I) described above, but the present invention is not limited to this, and may not have the structure (I) described above. That is, the uniaxial eccentric screw pump 10 may be configured so that fluid can enter and exit without the recess 164 being configured to be fluid-tight. In this case, the uniaxial eccentric screw pump 10 is configured to easily clean the concave portion 164, or to smoothly discharge the fluid flowing into the concave portion 164 from the concave portion 164, or the like, so that the fluid is not easily retained in the concave portion 164.

(J) The uniaxial eccentric screw pump 10 of the present embodiment has coupling portion structures 112 and 212 provided at the end portions of the coupling shaft 70, and the first shaft coupling portions 110 and 210 are configured by fixing the coupling portion structures 112 and 212 to the coupling shaft 70 in a state in which the end portions of the coupling shaft 70 are inserted into the insertion portions 122 provided in the coupling portion structures 112 and 212. The connecting portion structure 112 is formed as: the recess 164 has a seal portion 120 inside to seal a gap between the insertion portion 122 and the coupling shaft 70. By adopting such a configuration, the uniaxial eccentric screw pump 10 can prevent the fluid from flowing into the inside of the concave portion 164 through the gap formed between the insertion portion 122 provided in the coupling portion structure 112 and the coupling shaft 70. As a result, the uniaxial eccentric screw pump 10 can suppress degradation of the fluid in the recess 164 due to the inflow of the fluid into the recess 164 or corrosion of the member disposed in the recess 164 by the fluid.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (J) described above, but the present invention is not limited to this, and may not have the structure (J) described above. That is, the uniaxial eccentric screw pump 10 is shown as an example in which the seal portion 120 is provided in the coupling portion structure 112 constituting the first shaft coupling portion 110, but the present invention is not limited to this, and a structure in which the seal portion 120 is not provided may be adopted. In addition, in the case of such a configuration, the uniaxial eccentric screw pump 10 has a high possibility that the fluid flows into the concave portion 164 because the sealing portion 120 is not present. Therefore, when the seal portion 120 is not provided, the uniaxial eccentric screw pump 10 is preferably configured to easily clean the concave portion 164, or to smoothly discharge the fluid flowing into the concave portion 164 from the concave portion 164, so that the fluid is not easily retained in the concave portion 164.

(K) The uniaxial eccentric screw pump 10 of the present embodiment is formed to include: a flexible coupling shaft 70, a rotor 30 composed of a male-threaded shaft body, and a stator 20 having an inner peripheral surface formed as a female thread, wherein the rotor 30 can be inserted into the stator 20; further, the uniaxial eccentric screw pump 10 is capable of transmitting the rotational power output from the driver 55 to the rotor 30 via the coupling shaft 70 and driving the rotor by forming the driving-side coupling portion 100 and the rotor-side coupling portion 200, wherein the driving-side coupling portion 100 directly or indirectly couples the coupling shaft 70 to the driving shaft 56 that receives the output of the driver 55 and rotates, and the rotor-side coupling portion 200 directly or indirectly couples the coupling shaft 70 to the rotor 30. In the uniaxial eccentric screw pump 10, the driving-side coupling portion 100 and the rotor-side coupling portion 200 are coupled so as to be able to be separated from each other in a state in which the fitting structure 180, 280 is formed by the first shaft coupling portions 110, 210 and the second shaft coupling portions 150, 250, wherein the first shaft coupling portions 110, 210 are provided on a first shaft (coupling shaft 70 in the present embodiment) constituting one shaft of two shafts to be coupled, and the second shaft coupling portions 150, 250 are provided on the driving shaft 56 or the rotor 30 constituting the second shaft as the other shaft. As described above, in the uniaxial eccentric screw pump 10, the driving-side coupling portion 100 and the rotor-side coupling portion 200 are not simply connected to the first shaft coupling portions 110 and 210 and the second shaft coupling portions 150 and 250 provided on the first shaft and the second shaft to be connected, but are connected to each other so as to be able to be separated from each other in addition to forming the fitting structures 180 and 280. Therefore, the uniaxial eccentric screw pump 10 of the present embodiment can connect the connecting shaft 70 to the rotor 30 or the drive shaft 56 in a state in which the axial displacement is less likely to occur. Further, in the uniaxial eccentric screw pump 10 of the present embodiment, the first shaft connecting portions 110 and 210 and the second shaft connecting portions 150 and 250 are connected to each other by the fitting structures 180 and 280, so that the axial displacement of the first shaft and the second shaft is not easily caused even when the disassembling operation is performed.

Further, the uniaxial eccentric screw pump 10 includes a fitting canceling member (in this embodiment, the connecting bolt 170) for canceling the fitting structures 180 and 280, and a fitting canceling member setting portion (in this embodiment, the non-coupling screw hole 118 b) for setting the connecting bolt 170. Therefore, the uniaxial eccentric screw pump 10 of the present embodiment can smoothly perform the operation for releasing the fitting structure 180, 280 formed by the first shaft coupling parts 110, 210 and the second shaft coupling parts 150, 250 using the connecting bolt 170 when the uniaxial eccentric screw pump is decomposed into the first shaft and the second shaft. Therefore, the uniaxial eccentric screw pump 10 of the present embodiment can easily perform the disassembling operation in addition to the coupling operation of the coupling shaft 70.

In the uniaxial eccentric screw pump 10 of the present embodiment, the drive side connecting portion 100 and the rotor side connecting portion 200 are connected so as to be able to be separated from each other by forming the fitting structures 180 and 280, but the present invention is not limited to this. The uniaxial eccentric screw pump 10 may be configured to connect to either the driving-side connecting portion 100 or the rotor-side connecting portion 200 without forming the fitting structures 180 and 280.

The uniaxial eccentric screw pump 10 of the present embodiment includes both a fitting canceling member for canceling the fitting structures 180 and 280 and a fitting canceling member setting portion for setting the connecting bolt 170, but the present invention is not limited thereto. The uniaxial eccentric screw pump 10 may not include any one of the fitting canceling member for canceling the fitting structures 180 and 280 and the fitting canceling member setting portion for setting the connecting bolt 170. For example, in the present embodiment, the uniaxial eccentric screw pump 10 is configured to have the fitting canceling member by being able to flexibly use the connecting bolt 170 as the fitting canceling member, but may be configured to be able to mount a bolt, another member, a tool, or the like, which is prepared separately from the connecting bolt 170 and does not constitute the uniaxial eccentric screw pump 10, in the non-coupling screw hole 118b as the fitting canceling member.

In the present embodiment, the coupling shaft 70 is the first shaft of the present invention and the drive shaft 56 or the rotor 30 is the second shaft, but a configuration may be adopted in which the coupling shaft 70 is the second shaft and the drive shaft 56 or the rotor 30 is the first shaft. Further, the configuration illustrated in the present embodiment as the member provided on the first shaft and the configuration illustrated as the member provided on the second shaft may be replaced.

(L) in the uniaxial eccentric screw pump 10 of the present embodiment described above, the connecting bolt 170 has the threaded shaft 170s, and the non-connecting screw hole 118b is formed by a hole having a screw thread screwed with the threaded shaft 170 s. Since the uniaxial eccentric screw pump 10 is configured as described above, the connecting bolt 170 that constitutes the fitting canceling member can be firmly set by the screwing force generated between the connecting bolt and the non-coupling screw hole 118b that constitutes the fitting canceling member setting portion. Further, by rotating the screw shaft 170s while screwing the screw shaft 170s constituting the fitting canceling member with the non-coupling screw hole 118b constituting the fitting canceling member installation portion, the screw shaft 170s can be advanced and retracted in the axial direction, and the force generated thereby can be applied to canceling the fitting structure 180, 280. Therefore, the uniaxial eccentric screw pump 10 can sufficiently apply the force required to release the fitting of the fitting structures 180 and 280 by screwing the threaded shaft 170s into the non-coupling screw hole 118 b.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (L) described above, but the present invention is not limited to this, and may not have the structure (L) described above. In the uniaxial eccentric screw pump 10 of the present embodiment, the screw receiving portion constituting the fitting canceling member installation portion is constituted by a hole having a screw thread screwed with the screw shaft 170s, but the present invention is not limited to this. For example, the uniaxial eccentric screw pump 10 may be configured such that the screw receiving portion constituting the fitting canceling member installation portion is formed of a recess portion such as a non-through hole having a screw thread screwed to the screw shaft 170s or a depression.

The uniaxial eccentric screw pump 10 of the present embodiment uses the connecting bolt 170 having a head portion in addition to the screw shaft 170s as the fitting canceling member, but the present invention is not limited to this. For example, the uniaxial eccentric screw pump 10 may be configured as a fitting canceling member by a shaft body having the threaded shaft 170s but not having a head.

(M) the uniaxial eccentric screw pump 10 of the present embodiment is configured as: the fitting structure 180, 280 can be released from the fitting by a releasing operation accompanying a separating operation of separating the first shaft coupling portions 110, 210 and the second shaft coupling portions 150, 250 in a direction along the axial direction of the coupling shaft 70. The non-coupling screw hole 118b is provided so as to enable the screw shaft 170s to advance and retreat in the axial direction of the coupling shaft 70. Accordingly, in the uniaxial eccentric screw pump 10, the threaded shaft 170s is advanced, so that the pressing force acts on the second shaft coupling portions 150 and 250 in a direction away from the first shaft coupling portions 110 and 210, and the first shaft coupling portions 110 and 210 and the second shaft coupling portions 150 and 250 are separated from each other, whereby the fitting structure can be released.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (M) described above, but the present invention is not limited to this, and may not have the structure (M) described above. In the present embodiment, the fitting structure 180, 280 can be disengaged by the separating operation of separating in the direction along the axial direction of the connecting shaft 70, but the present invention is not limited thereto. For example, the chimeric structure 180, 280 may be formed as: in addition to or instead of the separation operation in the direction along the axis of the coupling shaft 70, the engagement can be released by performing a rotation operation about the axis of the coupling shaft 70, a movement in a direction intersecting the axis of the coupling shaft 70, or the like.

(N) the uniaxial eccentric screw pump 10 of the present embodiment is configured as: the first shaft coupling portions 110 and 210 are provided with the non-coupling screw holes 118b, and the first shaft coupling portions 110 and 210 and the second shaft coupling portions 150 and 250 can be moved relatively in the direction in which the fitting structures 180 and 280 are released by advancing the screw shafts 170s attached to the non-coupling screw holes 118b in a state of being in contact with the second shaft coupling portions 150 and 250. Accordingly, the uniaxial eccentric screw pump 10 can convert the rotational force for rotating the screw shaft 170s into a force in the axial direction of the coupling shaft 70, and can be used for releasing the fitting structure 180, 280.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (N) described above, but the present invention is not limited to this, and may not have the structure (N) described above. The uniaxial eccentric screw pump 10 illustrated in the present embodiment is exemplified by the following configuration: that is, the fitting structure 180, 280 can be released by converting the rotational force of the screw shaft 170s in the axial direction into the thrust force of the screw shaft 170s in the axial direction by the action of the screw, and outputting the force for releasing the fitting, but the present invention is not limited thereto. For example, instead of the screw shaft 170s, a shaft body having no screw thread or another member having a shaft-like portion may be used as the fitting canceling member, and the non-coupling screw hole 118b may be a through hole having no screw thread. In the case of adopting such a configuration, the uniaxial eccentric screw pump 10 can release the fitting structure 180, 280 by inserting a shaft body or the like used as the fitting release member in place of the threaded shaft 170s into the through hole used as the fitting release member installation portion in place of the non-coupling threaded hole 118b, and applying a pressing force to the shaft body in the axial direction in this state.

(O) the uniaxial eccentric screw pump 10 of the present embodiment is configured as: the flange portion 116 extending in a direction intersecting the axial direction of the coupling shaft 70 is provided on the coupling shaft 70 as a member constituting the first shaft coupling portions 110, 210, and the driving-side coupling portion 100 and the rotor-side coupling portion 200 are connected to the first shaft coupling portions 110, 210 and the second shaft coupling portions 150, 250 by bringing the flange portion 116 into surface contact with the second shaft coupling portions 150, 250 and attaching the connecting bolt 170 across the flange portion 116 and the second shaft coupling portions 150, 250. As a result, the uniaxial eccentric screw pump 10 can receive a moment acting in the axial direction and the shaft rotation direction in association with the eccentric rotation at the surface contact portion between the flange portion 116 constituting the first shaft coupling portions 110 and 210 and the second shaft coupling portions 150 and 250. Therefore, the uniaxial eccentric screw pump 10 is less likely to shake at the connection portion of the first shaft connection portions 110, 210 and the second shaft connection portions 150, 250. In addition, even if the connecting shaft 70 is eccentrically rotated by the driving, the uniaxial eccentric screw pump 10 is less likely to be damaged by fretting or stress concentration at the connecting portion between the first shaft connecting portions 110 and 210 and the second shaft connecting portions 150 and 250.

The uniaxial eccentric screw pump 10 of the present embodiment has the structure (O) described above, but the present invention is not limited to this, and may not have the structure (O) described above. The uniaxial eccentric screw pump 10 of the present embodiment has been described as an example in which the connecting shaft 70 is provided as the first shaft and the flange 116 is provided as a member constituting the first shaft connecting portions 110 and 210, but the present invention is not limited to this. The uniaxial eccentric screw pump 10 may be configured to: the drive shaft 56 or the rotor 30 is used as a first shaft, and a member corresponding to the flange 116 is provided on either or both of them. In the uniaxial eccentric screw pump 10 of the present embodiment, the flange 116 is provided as a member constituting the first shaft coupling portions 110 and 210, and the flange 116 is coupled to the end surfaces of the second shaft coupling portions 150 and 250 in a surface contact manner, but the present invention is not limited thereto. The uniaxial eccentric screw pump 10 may be configured such that the flange 116 similar to the flange 116 is provided in the second shaft coupling parts 150 and 250, and the flange 116 is coupled in surface contact with each other. In the present embodiment, the flange portion 116 is provided as a member constituting the first shaft connecting portions 110 and 210, but the uniaxial eccentric screw pump 10 may be formed as follows: for example, a structure for avoiding fretting or stress concentration is additionally provided, and the flange portion 116 is not provided.

The uniaxial eccentric screw pump 10 is merely an example of one embodiment of the present invention, and may be appropriately configured within a range not departing from the gist of the present invention. For example, the uniaxial eccentric screw pump 10 may be formed as: instead of the non-coupling screw hole 118b or in addition to the non-coupling screw hole 118b, a member that receives the fitting canceling member to be inserted into the gap between the first shaft coupling portions 110, 210 and the second shaft coupling portions 150, 250 is provided as the fitting canceling member setting portion.

(Q) further specifically, the uniaxial eccentric screw pump 10 may be configured to: a groove is provided between the first shaft coupling portions 110 and 210 and the second shaft coupling portions 150 and 250 as a fitting canceling member installation portion.

The uniaxial eccentric screw pump 10 can perform an operation of inserting the fitting canceling member into the gap between the first shaft coupling portions 110 and 210 and the second shaft coupling portions 150 and 250 to cancel the fitting structure 180 and 280 by adopting the configuration (P) or (Q) described above. For example, as described in (Q) above, the fitting structure 180, 280 formed by the first shaft coupling portion 110, 210 and the second shaft coupling portion 150, 250 can be released by providing the fitting releasing member installation portion for installing the fitting releasing member between the first shaft coupling portion 110, 210 and the second shaft coupling portion 150, 250 by using a flat-ended tool such as a crow bar or a straight screwdriver as the fitting releasing member and inserting the flat-ended tool into the groove. Further, the fitting structure 180, 280 formed by the first shaft coupling portions 110, 210 and the second shaft coupling portions 150, 250 can be released by using a tool configured to be capable of expanding the interval between the pair of operation pieces, a tool configured to be the same as a Gear puller (Gear puller), or the like by applying an external force by rotation of a screw or the like, which is provided as a fitting releasing member, which is provided with a pair of operation pieces capable of being interposed between the first shaft coupling portions 110, 210 and the second shaft coupling portions 150, 250.

In addition, the present embodiment shows the following example: that is, the fitting structure 180, 280 can be released by the pushing force of the connecting bolt 170 generated by rotating the connecting bolt 170 in a state where the connecting bolt 170 is screwed together with the connecting bolt 170 as the fitting releasing member setting portion and the non-connection screw hole 118b screwed with the connecting bolt 170, but the present application is not limited to this. For example, it may be formed as follows: the fitting structure 180, 280 can be released by providing a screw receiving portion constituted by a screw hole or a recess portion such as a hole having a screw like the non-coupling screw hole 118b as a fitting releasing member installation portion, inserting an eye bolt into the screw receiving portion, and pulling the eye bolt by a chain hoist, or the like.

The present application is not limited to the embodiments described above, modifications, and the like, and other embodiments can be obtained based on the teachings and spirit thereof without departing from the scope of the claims. The constituent elements of the above embodiments may be arbitrarily selected and combined. Any of the components of the embodiments and any of the components described in the means for solving the application or any of the components described in the means for solving the application may be combined in any manner. In this regard, the present application is also intended to be modified or filed with a separate application.

(availability in industry)

The present invention is applicable to all fluid discharge systems for pressure-feeding and discharging fluids.

Claims

1. A uniaxial eccentric screw pump is characterized by comprising:

a connecting shaft with flexibility is provided, and the connecting shaft is provided with a connecting shaft,

a rotor comprising a shaft body with male threads, and

a stator having an inner peripheral surface formed as a female screw, the rotor being insertable through the stator;

the uniaxial eccentric screw pump has a driving-side coupling portion formed by directly or indirectly coupling a first shaft coupling portion provided on the coupling shaft and a second shaft coupling portion provided on an output shaft that receives an output of a driving machine and rotates;

the shaft seal component is arranged on the output shaft;

the second shaft coupling portion is configured by attaching an adapter that is detachable from the output shaft to the output shaft at a position that is offset to an axial end side of the output shaft from the shaft seal member;

the adapter has an adapter expanded diameter portion that bulges in a direction intersecting the output shaft axial direction with the axis direction of the output shaft.

2. The uniaxial eccentric screw pump of claim 1 wherein the pump is a pump of the type described in claim 1,

In the second shaft coupling portion, the shaft seal member is positioned in the axial direction of the output shaft by abutting against the adapter enlarged diameter portion.

3. A uniaxial eccentric screw pump according to claim 1 or 2, wherein,

the second shaft coupling portion couples the adapter and the output shaft in a state in which a fitting structure is formed;

the uniaxial eccentric screw pump includes at least one of an adapter releasing member for releasing the fitting structure of the second shaft coupling portion and an adapter releasing member setting portion for setting the adapter releasing member.

4. The uniaxial eccentric screw pump of claim 3 wherein the pump is a pump in which,

the fitting structure is formed by gap fitting.

5. The uniaxial eccentric screw pump of claim 3 or 4 wherein,

the adapter release member has a threaded shaft;

the adapter releasing member setting portion is a hole or a recess having a screw thread screwed with the screw shaft.

6. The uniaxial eccentric screw pump of any one of claim 1 to 5 wherein,

the adapter has a recess that accommodates at least a portion of the first shaft coupling portion;

A fixing member for fixing the adapter to the output shaft is provided inside the recess.

7. The uniaxial eccentric screw pump of claim 6 wherein the pump is a pump type,

the uniaxial eccentric screw pump may use the fixing member detached from a fixing portion of the adapter and the output shaft as an adapter releasing member for releasing the fitting structure of the second shaft coupling portion.

8. The uniaxial eccentric screw pump of claim 7 wherein the pump is a pump type,

the fixing part is provided with a threaded shaft;

the adapter includes a screw receiving portion as the adapter releasing member setting portion, the screw receiving portion being constituted by a hole or a recess having a screw thread screwed with a screw shaft constituting the fixing member;

the adapter and the output shaft can be moved relatively in a direction to release the fitting structure of the second shaft coupling portion by screwing the fixing member, which is detached from the fixing portion of the adapter and the output shaft, as the adapter releasing member, with the screw receiving portion, which constitutes the adapter releasing member setting portion, and advancing toward the output shaft, so that the screw shaft and the output shaft can be brought into direct or indirect contact with each other.

9. The uniaxial eccentric screw pump of any one of claims 5 to 8 wherein the interior of the recess is arranged to be fluid tight.

10. The uniaxial eccentric screw pump of claim 9 wherein the pump is a pump cylinder,

the uniaxial eccentric screw pump has a connecting part structure arranged at the end part of the connecting shaft;

the first shaft coupling portion is configured by fixing the coupling portion structure to the coupling shaft in a state in which an end portion of the coupling shaft is inserted into an insertion portion provided in the coupling portion structure;

the recess has a sealing portion for sealing a gap between the insertion portion and the coupling shaft.