Single-screw eccentric pump

Abstract

To provide a uniaxial eccentric screw pump which enables a shaft seal member to be installed with high positioning accuracy at the output shaft side when a connection shaft and an output shaft are connected and enables maintenance etc. of the shaft seal member to be easily performed while having a structure in which an output side connection part has a diameter larger than that of the output shaft.SOLUTION: In a uniaxial eccentric screw pump 10, a shaft seal member 60 is provided at a drive shaft 56. A second shaft connection part 150 is formed by attaching an adapter 160, which may be detachably attached to the drive shaft 56, to the drive shaft 56 at a position offset to an axial end side of the drive shaft 56 relative to the shaft seal member 60. The adapter 160 includes an adapter enlarged diameter part which expands in a direction intersecting with an axial direction of the drive shaft 56 relative to the drive shaft 56.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a uniaxial eccentric screw pump.

Background Art

[0002] Conventionally, in a uniaxial eccentric screw pump disclosed in Patent Document 1 below, the rotational power output from the output shaft of a drive machine can be transmitted to a rotor via a connecting shaft such as a flexible rod. A connecting portion (connecting structure portion) between a shaft body (drive shaft in Patent Document 1) connected to the connecting shaft is connected by adhesion after inserting one into the other.

[0003] Also, in a uniaxial eccentric screw pump disclosed in Patent Document 2 below, a screw shaft portion provided at the tip of a flexible rod is inserted into and screwed into a shaft insertion hole provided in a rotor or a drive shaft to be joined. Further, the end portion 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 joining in this way, the two shafts can be joined so that rattling does not occur.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, the inventors considered increasing the size of the enlarged portion (hereinafter also referred to as the "enlarged diameter portion"), which is provided on a flexible connecting shaft (first shaft) that is as flexible as a flexible rod, by making it flange-like, and connecting it to an output shaft (second shaft) that rotates in response to the output of a drive machine, in order to make the connection stronger. As a result, in such a configuration, it is necessary to provide a connecting portion on the output shaft which forms the second shaft that corresponds in size to the enlarged diameter portion provided on the connecting portion which forms the first shaft. When such a connecting portion is provided on the output shaft and a shaft sealing member is attached to the output shaft, the problem arises that the entire long output shaft must be pulled out when maintenance or other work is required, resulting in poor workability.

[0006] Therefore, the present invention aims to provide a single-screw eccentric pump that allows for a strong connection between the connecting shaft and the output shaft by having the output-side connecting portion have a larger diameter than the output shaft, while also allowing for easy maintenance of the shaft seal member. [Means for solving the problem]

[0007] (1) The single-screw eccentric pump of the present invention, provided to solve the above-mentioned problems, comprises a flexible connecting shaft, a rotor composed of a male screw-type shaft body, and a stator through which the rotor can be inserted and whose inner circumferential surface is formed in the shape of a female screw, and 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 rotates upon receiving the output of the drive machine, the output shaft is provided with a shaft sealing member, the second shaft connecting portion is configured by attaching a detachable adapter to the output shaft at a position away from the shaft sealing member towards the axial end of the output shaft, and the adapter has an adapter enlarged diameter portion that bulges out in a direction intersecting the axial direction of the output shaft from the output shaft.

[0008] The single-screw pump of the present invention is provided with a shaft seal member on the output shaft, and an adapter forming the second shaft connection portion of the output shaft is positioned further toward the axial end of the output shaft than the shaft seal member. Furthermore, the adapter is detachable from the output shaft and has an enlarged diameter portion that bulges in a direction intersecting the axial direction of the output shaft. As a result, the single-screw pump of the present invention can firmly connect the connecting shaft and the output shaft. In addition, 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 major work such as removing the output shaft from the drive unit.Therefore, the single-screw pump of the present invention allows the connecting shaft and the output shaft to be connected via the adapter at the drive-side connection portion, and maintenance and other operations can be easily performed.

[0009] Here, after careful consideration by the inventors, it was found that when using a shaft sealing member that maintains sealing performance through surface pressure caused by the biasing force of a spring, such as a mechanical seal, it is necessary to position the shaft sealing member while biased with an assembly jig in order to adjust the biasing force to the appropriate level during assembly. However, if the enlarged diameter portion is integrally provided with the output shaft, there is a concern that the enlarged diameter portion will get in the way, making it difficult to position the shaft sealing member or requiring a dedicated positioning jig.

[0010] (2) In order to solve the above problems, the single-screw eccentric pump of the present invention described above is preferably characterized in that, in the second shaft connecting portion, the shaft sealing member is positioned in the axial direction of the output shaft by contacting the adapter enlarged diameter portion.

[0011] The single-screw pump of the present invention, with this configuration, allows for precise positioning of the shaft seal member with respect to the adapter's enlarged diameter portion. As a result, the single-screw pump of the present invention allows for easy positioning of the shaft seal member without the need for a dedicated positioning jig during installation, thus simplifying assembly work.

[0012] (3) The single-screw eccentric pump of the present invention described above is characterized in that the second shaft connecting portion connects the adapter and the output shaft in a fitted structure, and comprises at least one of the adapter release member for releasing the fitted structure in the second shaft connecting portion and an adapter release member installation portion for providing the adapter release member.

[0013] As described above, the single-screw pump of the present invention connects the adapter and the output shaft after forming a fitting structure, allowing for connection and disconnection of the adapter and the output shaft in a manner that minimizes misalignment of the axial center. Furthermore, as described above, the single-screw pump of the present invention is equipped with at least one of an adapter release member and an adapter release member mounting section, enabling smooth operation of releasing the fitting structure between the adapter and the output shaft. Therefore, in addition to easy connection of the adapter and output shaft, disassembly is also easily performed with the single-screw pump of the present invention.

[0014] (4) The single-screw eccentric pump of the present invention described above is preferably configured such that the fitting structure is made by gap fitting.

[0015] The single-screw eccentric pump of the present invention, with this configuration, allows for easy disassembly and assembly of the fitting structure composed of the adapter and the output shaft.

[0016] (5) The single-screw eccentric pump of the present invention described above is preferably characterized in that the adapter release member is equipped with a screw shaft, and the adapter release member mounting portion is equipped with a screw receiving portion consisting of a hole or recess with a screw that engages with the screw shaft.

[0017] The single-screw pump of the present invention, with this configuration, can firmly install the member equipped with a screw shaft that forms the adapter release member by the screwing force generated between it and the screw receiving portion that forms the adapter release member installation portion. Furthermore, by rotating the screw shaft while screwing it into the screw receiving portion that forms the adapter release member installation portion, the screw shaft is moved back and forth in the axial direction, and the force generated thereby can be used to release the fitting structure. Therefore, the single-screw pump of the present invention can sufficiently apply the force necessary to release the fitting in the fitting structure by screwing the screw shaft that forms the adapter release member into the screw receiving portion that forms the adapter release member installation portion.

[0018] (6) The single-screw eccentric pump of the present invention described above is preferably characterized in that the adapter has a recess that receives at least a part of the first shaft connecting portion, and a fixing member is provided inside the recess for fixing the adapter with respect to the output shaft.

[0019] In the single-screw eccentric pump of the present invention, the recess provided to receive at least a portion of the first shaft connecting portion can also be used as a space for housing a fixing member for fixing the adapter to the output shaft.

[0020] (7) The single-screw eccentric pump of the present invention described above is characterized in that the second shaft connecting portion connects the adapter and the output shaft in a fitted structure, and the fixing member removed from the fixing point between the adapter and the output shaft can be used as an adapter release member for releasing the fitted structure in the second shaft connecting portion.

[0021] The single-screw pump of the present invention, with this configuration, allows the fixing member removed from the fixing point to be used as an adapter release member to release the fitting structure when disassembling the adapter and output shaft. Therefore, the single-screw pump of the present invention does not require a separate adapter release member in addition to the fixing member, and is expected to have effects such as a reduction in the number of parts, resulting in cost reduction and improved workability.

[0022] (8) The uniaxial eccentric screw pump of the present invention described above is such that the fixing member includes a screw shaft, and the adapter includes a screw receiving portion that engages with the screw shaft forming the fixing member as the adapter release member installation portion. With respect to the screw receiving portion forming the adapter release member installation portion, the fixing member removed from the fixing location between the adapter and the output shaft is screwed as the adapter release member and advanced toward the output shaft, thereby bringing the screw shaft into direct or indirect contact with the output shaft, and enabling relative movement between the adapter and the output shaft in a direction to release the fitting structure in the second shaft connection portion. This is a preferable feature.

[0023] With such a configuration, the uniaxial eccentric screw pump of the present invention can apply the force generated by screwing the fixing member removed from the fixing location between the adapter and the output shaft as the adapter release member and advancing it toward the output shaft, to the output shaft. Thereby, the uniaxial eccentric screw pump of the present invention can utilize the force generated by rotating and advancing the screw shaft to release the fitting structure.

[0024] (9) The uniaxial eccentric screw pump of the present invention described above is preferably characterized in that the inside of the recess is made liquid-tight.

[0025] With such a configuration, the uniaxial eccentric screw pump of the present invention can suppress the inflow of the fluid into the inside of the recess and the deterioration inside the recess, or the corrosion of the members arranged inside the recess by the fluid.

[0026] (10) The uniaxial eccentric screw pump of the present invention described above has a connecting portion structure provided at the end of the connecting shaft. In a state where the end of the connecting shaft is inserted into the insertion portion provided in the connecting portion structure, the connecting portion structure is fixed to the connecting shaft, thereby constituting the first shaft connecting portion. Inside the concave portion, a sealing portion for sealing the gap between the insertion portion and the connecting shaft is provided. It is preferably characterized by this.

[0027] By adopting such a configuration, the uniaxial eccentric screw pump of the present invention can suppress the inflow of the fluid into the inside of the concave portion through the gap formed between the insertion portion provided in the connecting portion structure and the connecting shaft. As a result, the uniaxial eccentric screw pump of the present invention can suppress the deterioration of the fluid inside the concave portion and the corrosion of the members arranged inside the concave portion by the fluid.

Effect of the Invention

[0028] According to the present invention, when connecting the connecting shaft and the output shaft, it is possible to install the shaft sealing member with high positioning accuracy on the output shaft side, and while making the connecting portion on the output side have a diameter larger than that of the output shaft to firmly connect the connecting shaft and the output shaft, it is possible to provide a uniaxial eccentric screw pump that can easily perform maintenance of the shaft sealing member and the like.

Brief Description of the Drawings

[0029] [Figure 1] It is a cross-sectional view of a uniaxial eccentric screw pump according to an embodiment of the present invention. [Figure 2] It is an enlarged view of the vicinity of the drive-side connecting portion of the uniaxial eccentric screw pump according to FIG. 1. [Figure 3] It is an exploded perspective view showing the state where the drive-side connecting portion of the uniaxial eccentric screw pump according to FIG. 1 is disassembled. [Figure 4] It is an exploded perspective view showing the drive shaft and the first shaft connecting portion of the uniaxial eccentric screw pump according to FIG. 1. [Figure 5] It is an exploded perspective view showing the state where the drive-side connecting portion of the uniaxial eccentric screw pump according to FIG. 1 is disassembled. [Figure 6]This figure shows the adapter viewed from the front, from the positioning end face side. [Figure 7] This diagram shows the main body of the component constituting the first connecting section, viewed from the front. [Figure 8] Figure 1 is a magnified view of the vicinity of the rotor-side connection part of the single-screw eccentric pump shown in Figure 1. [Modes for carrying out the invention]

[0030] Next, a single-screw eccentric pump 10 according to one embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the overall structure of the single-screw eccentric pump 10 will be described first, and then the drive-side connecting portion 100 and the rotor-side connecting portion 200 will be described in more detail.

[0031] ≪Overall structure of the single-screw eccentric pump 10≫ As shown in Figure 1, the single-screw eccentric pump 10 is a so-called rotary positive displacement pump, and as shown in Figure 1, the stator 20, rotor 30, power transmission mechanism 50, etc. are housed inside the casing 12. The casing 12 is a cylindrical member made of metal, and a first opening 14a is provided in a disc-shaped end stud 12a attached to one end in the longitudinal direction. A second opening 14b is also provided on the outer circumference of the casing 12. The second opening 14b communicates with the internal space of the casing 12 at an intermediate section 12d located in the middle of the casing 12 in the longitudinal direction.

[0032] The first opening 14a and the second opening 14b function as the suction port and discharge port of the single-screw eccentric pump 10, respectively. In this embodiment, the single-screw eccentric pump 10 can pump fluid by rotating the rotor 30 in the forward direction, so that the first opening 14a functions as the discharge port and the second opening 14b functions as the suction port. The single-screw eccentric pump 10 can also pump fluid by rotating the rotor 30 in the reverse direction, so that the first opening 14a functions as the suction port and the second opening 14b functions as the discharge port. Hereafter, unless otherwise specified, the single-screw eccentric pump 10 will be described as operating with the first opening 14a functioning as the discharge port and the second opening 14b functioning as the suction port.

[0033] The stator 20 is a component having a cylindrical external shape. The stator 20 can be made of, for example, an elastic material, resin, metal, or ceramics. The material of the stator 20 is appropriately selected according to the type and properties of the material (fluid) to be transported using the single-screw eccentric pump 10. The stator 20 is housed inside the stator mounting portion 12b located adjacent to the first opening 14a in the casing 12. The outer diameter of the stator 20 is approximately the same as the inner diameter of the stator mounting portion 12b. Therefore, the stator 20 is mounted with its outer circumferential surface in close contact with the inner circumferential surface of the stator mounting portion 12b. The stator 20 is also fixed by clamping the flange portion 20a at one end with an end stud 12a at the end of the casing 12, and then attaching and tightening a stay bolt 16 between the end stud 12a and the main body portion of the casing 12. Therefore, the stator 20 does not experience misalignment within the stator mounting portion 12b of the casing 12. The inner circumferential surface 24 of the stator 20 has a single-stage or multi-stage female thread shape with n threads. In this embodiment, as shown in Figures 1 and 2, it has a multi-stage shape with two threads.

[0034] The rotor 30 is composed of a male screw-type shaft. The rotor 30 is made of a material such as metal or ceramics. The material of the rotor 30 is appropriately selected according to the type and properties of the material being conveyed (fluid). The rotor 30 has a single-stage or multi-stage female screw shape with n-1 threads. In this embodiment, the rotor 30 has one thread and is multi-stage. The rotor 30 is the shaft (connected shaft) to which the connecting shaft 70, which will be described in detail later, is connected. The rotor 30 is connected to the connecting shaft 70 (connecting shaft) via the rotor-side connecting part 200. The rotor 30 rotates eccentrically due to the power transmitted via the connecting shaft 70. The rotor 30 is formed such that its cross-sectional shape is approximately circular no matter which position in the longitudinal direction it is viewed in cross-section. The rotor 30 is inserted through the through hole 22 formed in the stator 20 described above, and is capable of freely rotating eccentrically inside the through hole 22.

[0035] When the rotor 30 is inserted into the stator 20, the outer circumferential surface 32 of the rotor 30 and the inner circumferential surface 24 of the stator 20 come into contact at their tangent lines (seal lines). This creates a series of independent sealed spaces called cavities 34 between the inner circumferential surface 24 of the stator 20, which forms the through hole 22, and the outer circumferential surface of the rotor 30. The cavities 34 constitute a fluid transport path 40 for transporting fluids that are not transported. The fluid transport path 40 is a multi-stage (d-stage) flow path having a length d times the standard length S of the lead of the stator 20 and rotor 30 in the axial direction of the stator 20 and rotor 30, with the length L of the lead being the standard length S.

[0036] The fluid transport channel 40 extends spirally in the longitudinal direction of the stator 20 and rotor 30. Furthermore, when the rotor 30 is rotated within the through-hole 22 of the stator 20, the fluid transport channel 40 rotates within the stator 20 and moves in the longitudinal direction of the stator 20. Therefore, when the rotor 30 is rotated, it is possible to draw fluid into the fluid transport channel 40 from one end of the stator 20, transport this fluid while it is confined within the fluid transport channel 40 toward the other end of the stator 20, and discharge it at the other end of the stator 20. In other words, when the rotor 30 is rotated in the forward direction, it is possible to pressurize the fluid drawn in from the second opening 14b and discharge it from the first opening 14a. Conversely, when the rotor 30 is rotated in the reverse direction, it is possible to discharge the fluid drawn in from the first opening 14a through the second opening 14b.

[0037] The power transmission mechanism 50 is provided to transmit power from a drive unit 55, such as a motor, located outside the casing 12, to the rotor 30 described above. The power transmission mechanism 50 has a power connection part 52 and an eccentric rotation part 54. The power connection part 52 is located in the shaft housing part 12c, which is located on one end of the casing 12 in the longitudinal direction, and more specifically on the opposite side from where the end studs 12a and stator mounting part 12b are located (hereinafter also simply referred to as the "base end side"). The eccentric rotation part 54 is located in the intermediate part 12d formed between the shaft housing part 12c and the stator mounting part 12b.

[0038] The power connection section 52 has a drive shaft 56. The drive shaft 56 is rotatably supported by two bearings 56a and 56b. The drive shaft 56 is brought out from the closed portion at the base end of the casing 12. The drive shaft 56 is connected to the drive unit 55. Therefore, by operating the drive unit 55, the drive shaft 56 can be rotated. In other words, the drive shaft 56 is a shaft that functions as an output shaft that rotates in response to the output of the drive unit 55.

[0039] A shaft seal member 60 is provided between the shaft housing 12c, where the power connection section 52 is located, and the intermediate section 12d. The shaft seal member 60 is provided to prevent the fluid being transported from leaking out from the intermediate section 12d to the shaft housing 12c. The shaft seal member 60 can be made of, for example, a mechanical seal or a gland packing. In this embodiment, a mechanical seal is used as the shaft seal member 60. The shaft seal member 60 is mounted on the drive shaft 56 (output shaft).

[0040] The eccentric rotating section 54 is the part that connects the drive shaft 56 and the rotor 30 in a way that enables power transmission. The eccentric rotating section 54 has a connecting shaft 70. The connecting shaft 70 is made of a flexible shaft body. In this embodiment, the connecting shaft 70 is made of a flexible rod. The connecting shaft 70 is connected to the drive shaft 56 at one end (base end) in the longitudinal direction via the drive-side connecting section 100. The connecting shaft 70 is also connected to the rotor 30 at the other end (tip end) in the longitudinal direction via the rotor-side connecting section 200. With these configurations, the eccentric rotating section 54 can transmit the rotational power transmitted from the drive unit 55 via the drive shaft 56 to the rotor 30, and cause the rotor 30 to rotate eccentrically.

[0041] Regarding the drive-side coupling section 100: Next, the drive-side connecting portion 100 will be described. As shown in Figures 1 and 2, the drive-side connecting portion 100 is a part in which the connecting shaft 70 is the first shaft and the drive shaft 56 is the second shaft, and these shafts are connected directly or indirectly in the axial direction. The drive-side connecting portion 100 is formed by connecting the first shaft connecting portion 110 located at one end (base end) of the connecting shaft 70 and the second shaft connecting portion 150 located at the end (tip end) of the drive shaft 56 in a manner that allows for disassembly, while forming a fitting structure 180.

[0042] As shown in Figures 2 to 4, the first shaft connecting portion 110 can be integrally formed as part of the connecting shaft 70 by machining the end of the connecting shaft 70, but in this embodiment, it is constructed by attaching a connecting portion component 112, which is formed separately from the connecting shaft 70, to the connecting shaft 70. The connecting portion component 112 comprises a component body 114, a flange portion 116, a screw hole 118, and a seal portion 120.

[0043] The main body 114 is a cylindrical portion connected to the end of the connecting shaft 70. An insertion portion 122 is provided at the axial center of the main body 114. The insertion portion 122 is made up of a hole into which the end of the connecting shaft 70 can be inserted. The insertion portion 122 is designed so that the end of the connecting shaft 70 can be inserted with virtually no gap.

[0044] The flange portion 116 is a flange-like portion that extends in a direction intersecting the axial direction of the connecting shaft 70 inserted into the insertion portion 122. The flange portion 116 is provided around the entire circumference of the main body 114. The flange portion 116 is provided so as to extend radially outward in the axial middle portion of the main body 114.

[0045] The screw hole 118 is a hole with a screw on its inner surface that engages with the connecting bolt 170, which will be described later. The screw hole 118 is formed to penetrate the flange portion 116 in the axial direction. In addition, as shown in Figures 4 and 8, multiple screw holes 118 are provided in the direction around the axis of the main body 114. Some of the multiple screw holes 118 are located in positions corresponding to the screw holes 162c provided in the second axial connecting portion 150, which will be described later (hereinafter also referred to as "fastening screw holes 118a"), and the remainder are located in positions not corresponding to the screw holes 162c (hereinafter also referred to as "non-fastening screw holes 118b").

[0046] The fastening screw holes 118a are used when connecting the first shaft connecting portion 110 and the second shaft connecting portion 150 with the connecting bolt 170. Multiple fastening screw holes 118a are provided (eight in this embodiment) at approximately equal intervals in the direction of the axis of the main body 114 of the component.

[0047] The non-fastening screw hole 118b forms a release member installation section for installing a release member for releasing the fitted structure formed by the first shaft connecting portion 110 and the second shaft connecting portion 150. In this embodiment, as will be described later, the connecting bolt 170 is used as the release member. Therefore, the non-fastening screw hole 118b, like the fastening screw hole 118a, is provided with a screw on its inner circumferential surface that can be screwed into the screw shaft 170s of the connecting bolt 170. The non-fastening screw hole 118b is provided at a position offset from the fastening screw hole 118a in the direction of the axis of the main body 114. In addition, multiple non-fastening screw holes 118b are provided at positions symmetrical with respect to the axis of the main body 114 (two in this embodiment). In this embodiment, a dummy bolt 171 is inserted into the non-fastening screw hole 118b to keep the hole closed when not in disassembly work.

[0048] The sealing portion 120 seals the gap between the insertion portion 122 provided on the main body 114 and the connecting shaft 70 to prevent leakage of the fluid. As shown in Figures 2 and 3, the sealing portion 120 comprises a sealing member 126 and a cover member 128.

[0049] The sealing member 126 is composed of, for example, an O-ring or a gasket. In this embodiment, an O-ring with a diameter larger than the opening diameter of the insertion portion 122 is provided as the sealing member 126. The sealing member 126 is arranged to surround the circular opening region that forms the insertion portion 122.

[0050] The lid member 128 is a member that sandwiches the sealing member 126 between itself and the end face of the main body 114. The lid member 128 is a plate-shaped member that is larger than the opening area of ​​the insertion portion 122 provided in the main body 114, and is attached so as to cover the entire opening area of ​​the insertion portion 122. The lid member 128 is fixed to the end of the connecting shaft 70 inserted through the insertion portion 122 using a lid fixing bolt 130, with the sealing member 126 positioned between it and the end face of the main body 114. In this way, the lid member 128 is fixed along the end face of the main body 114 via the sealing member 126. By attaching the lid member 128 in this manner, a sealing portion 120 is provided with the sealing member 126 sandwiched between the end face of the main body 114 and the lid member 128, while the sealing member 126 surrounds the opening area of ​​the insertion portion 122.

[0051] The first shaft connecting portion 110 is provided with the above-described main body 114 at the end of the connecting shaft 70, and has a protrusion 140 that extends from the main body 114 toward the tip of the connecting shaft 70, with the flange portion 116 as the boundary. The protrusion 140 forms a fitting structure 180 in combination with the recess 164 of the second shaft connecting portion 150, which will be described later. The protrusion 140 has a cylindrical shape.

[0052] As shown in Figures 2, 3, and 5, the second shaft connecting portion 150 is provided on the drive shaft 56, which forms the second shaft, in the drive-side connecting portion 100. The second shaft connecting portion 150 can also be integrally formed as part of the drive shaft 56 by machining the end of the drive shaft 56, but in this embodiment, the drive shaft 56 is attached to an adapter 160 that is formed separately from the drive shaft 56, with a fitting structure formed between the adapter and the drive shaft 56.

[0053] As shown in Figures 1 and 2, the adapter 160 is detachably attached to the shaft sealing member 60 mounted on the drive shaft 56 at a position away from the axial end of the drive shaft 56. As shown in Figures 2, 5, and 6, the adapter 160 includes a connecting portion 162, a recess 164, and a shaft fitting portion 166.

[0054] The connecting portion 162 is the part used to connect to the flange portion 116 of the first shaft connecting portion 110. In this embodiment, the connecting portion 162 also constitutes an enlarged diameter portion (adapter enlarged diameter portion 162x) that bulges out in a direction intersecting the axial direction of the drive shaft 56 (hereinafter also referred to as the "radial direction") when attached to the drive shaft 56. The connecting portion 162 is made to have the same size in the radial direction as the flange portion 116 of the first shaft connecting portion 110 described above. The connecting portion 162 has a connecting end face 162a located on one side in the axial direction of the adapter 160 and a positioning end face 162b located on the other side in the axial direction.

[0055] The connecting end face 162a is the portion that makes surface contact with the flange portion 116 of the first shaft connecting portion 110 when the drive-side connecting portion 100 is configured. The connecting portion 162 has a plurality (eight in this embodiment) of screw holes 162c that open into the connecting end face 162a and are provided at equal intervals in the direction of the axis of the adapter 160. The screw holes 162c are provided at positions corresponding to the fastening screw holes 118a provided in the flange portion 116 of the first shaft connecting portion 110.

[0056] The fixing end face 162b is the surface facing the direction of the shaft seal member 60 provided on the drive shaft 56 when the drive-side connecting portion 100 is formed. The shaft seal member 60 is mounted in a position relative to the fixing end face 162b by contacting the fixing end face 162b.

[0057] The recess 164 is a concave portion that receives at least a part of the first shaft connecting portion 110 described above. In this embodiment, the recess 164 is designed to receive and fit the protrusion 140 of the first shaft connecting portion 110. Specifically, the recess 164 has an inner diameter that is approximately the same as the outer diameter of the protrusion 140 and has a concave shape that is recessed in the axial direction from the connecting end face 162a of the connecting portion 162. The depth of the recess 164 (length in the axial direction from the connecting end face 162a) is greater than or equal to the amount of protrusion of the protrusion 140 in the first shaft connecting portion 110 (length of protrusion in the axial direction from the flange portion 116). In this embodiment, considering the protrusion amounts of the bolt heads 168h of the adapter fixing bolts 168 that fix the adapter 160 to the drive shaft 56, and the bolt heads 130h of the cover fixing bolts 130 in the first shaft connecting portion 110, the depth of the recess 164 is set to be greater than or equal to the protrusion amounts of the bolt heads 168h and 130h than the protrusion amount of the convex portion 140. With this configuration, the drive-side connecting portion 100 can be fitted with the recess 164 and the convex portion 140 in a gap fit so that they form an spigot structure, and the connecting end face 162a of the connecting portion 162 and the flange portion 116 can be brought into surface contact with the drive shaft 56.

[0058] The recess 164 has an inner circumferential surface 164a and a partition wall 164b that intersects with the inner circumferential surface 164a. A recess sealing member 164c is provided on the inner circumferential surface 164a. The recess sealing member 164c is a member that seals the space between the outer circumferential surface of the protrusion 140 of the first shaft connecting portion 110 and the inner circumferential surface 164a when the protrusion 140 of the first shaft connecting portion 110 is inserted into the recess 164. The recess sealing member 164c is formed by an O-ring.

[0059] The partition wall 164b is a wall surface that separates the recess 164 from the shaft fitting portion 166, which is located off-center from the recess in the axial direction of the adapter 160. As shown in Figure 6, the partition wall 164b is provided with bolt insertion holes 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 holes 164d extend in the axial direction of the adapter 160 and are formed to reach the shaft fitting portion 166 from the recess 164. The bolt insertion holes 164d are located in positions corresponding to the bolt holes 56x provided in the drive shaft 56.

[0060] Here, as shown in Figures 2 and 5, the bolt holes 56x are holes that open at the end face of the drive shaft 56, extend in the axial direction, and have threads formed on their inner circumferential surface. Multiple bolt holes 56x (six in this embodiment) are provided at approximately equal intervals around the axis of the drive shaft 56. Multiple bolt insertion holes 164d are provided at positions corresponding to the bolt holes 56x provided in the drive shaft 56 in this manner, at equal intervals around the axis.

[0061] Furthermore, as shown in Figure 6, the partition wall 164b is provided with a recessed screw hole 164e (adapter release member installation portion) in addition to the bolt insertion hole 164d. The recessed screw hole 164e extends in the axial direction of the adapter 160, similar to the bolt insertion hole 164d, and is formed to reach the shaft fitting portion 166 from the recess 164. The inner circumferential surface of the recessed screw hole 164e has threads that engage with the screw shaft 168s of the adapter fixing bolt 168 used to fix the adapter 160. Therefore, by inserting the adapter fixing bolt 168 into the recessed screw hole 164e from the recess 164 side and rotating the adapter fixing bolt 168 with the screw shaft 168s engaged, the screw shaft 168s can be moved forward and backward toward the shaft fitting portion 166.

[0062] As shown in Figure 2, the shaft fitting portion 166 is provided on the opposite side (the other side in the axial direction) from the recess 164 on one side in the axial direction of the adapter 160, via the partition wall 164b described above. The shaft fitting portion 166 has a concave shape in the axial direction of the adapter 160, into which the drive shaft 56 can be inserted and fitted. The shaft fitting portion 166 is designed so that the drive shaft 56 can be inserted into it in a spigot structure.

[0063] The second shaft connecting portion 150 is configured such that the drive shaft 56 is inserted into the shaft fitting portion 166 of the adapter 160 described above via a sealing member (an O-ring 163 in this embodiment) to form a fitting structure 190. The adapter 160 is fixed to the end of the drive shaft 56 by aligning the bolt insertion hole 164d with the bolt hole 56x of the drive shaft 56, and fastening the adapter fixing bolt 168, which is inserted from the recess 164 into the bolt insertion hole 164d, to the bolt hole 56x via a washer 167 and a disc-shaped plate 169 having a hole at a position corresponding to the bolt insertion hole 164d. By mounting the adapter 160 to the drive shaft 56 in this way, the shaft sealing member 60 mounted on the drive shaft 56 comes into contact with the positioning end face 162b of the connecting portion 162 that constitutes the adapter 160. As a result, the shaft seal member 60 is fixed in a position relative to the positioning end face 162b in the axial direction of the drive shaft 56. In this embodiment, since a mechanical seal is used, the fixed ring and rotating ring of the mechanical seal can be positioned while being pressed against each other with an appropriate biasing force that maintains sliding surface pressure.

[0064] Furthermore, the second shaft connecting portion 150 can be advanced toward the shaft fitting portion 166 by rotating the adapter fixing bolt 168 after removing it from the bolt insertion hole 164d and bolt hole 56x and reattaching it to the recessed screw hole 164e. This applies an axial pressing force from the adapter fixing bolt 168 to the drive shaft 56, causing the two to move relative to each other in a direction that releases the fitting structure 190 between the adapter 160 and the drive shaft 56. In other words, in this embodiment, the adapter fixing bolt 168 used to fix the adapter 160 can be used as an adapter release member to release the fitting between the adapter 160 and the drive shaft 56.

[0065] The drive-side connecting portion 100 is formed by fitting and connecting the first shaft connecting portion 110 and the second shaft connecting portion 150 described above. Specifically, when connecting the connecting shaft 70 and the drive shaft 56, the protrusion 140 of the first shaft connecting portion 110 is inserted into the recess 164 of the second shaft connecting portion 150 to form a fitting structure 180. In addition, the first shaft connecting portion 110 and the second shaft connecting portion 150 can be connected by bringing the flange portion 116 into surface contact with the connecting portion 162, and inserting the screw shaft 170s of the connecting bolt 170 through the fastening screw hole 118a provided in the flange portion 116 and the screw hole 162c provided in the connecting portion 162 and screwing it in.

[0066] Furthermore, when disassembling the connecting shaft 70 and the drive shaft 56, the connecting bolt 170 is removed from the fastening screw hole 118a and screw hole 162c in the drive-side connecting portion 100. The removed connecting bolt 170 is then fastened to the non-fastening screw hole 118b provided in the flange portion 116 of the first shaft connecting portion 110. When the connecting bolt 170 is rotated further in this state, the screw shaft 170s of the connecting bolt 170 protrudes toward the connection portion 162 of the second shaft connecting portion 150. As a result, the screw shaft 170s presses against the connection end face 162a, causing the first shaft connecting portion 110 and the second shaft connecting portion 150 to move relative to each other in the axial direction so that they separate, and eventually the fitting structure 180, which was composed of 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 drive-side coupling portion 100 is disassembled into the coupling shaft 70 and the drive shaft 56.

[0067] Regarding the rotor-side connecting portion 200: Next, the rotor-side connecting portion 200 will be described. The rotor-side connecting portion 200 is similar to the drive-side connecting portion 100 described above in that the connecting shaft 70 is the first axis, but differs in that the rotor 30 is the second axis. As shown in Figure 8, the rotor-side connecting portion 200 is the part that directly or indirectly connects the connecting shaft 70 and the rotor 30 so that they are connected in the axial direction. The rotor-side connecting portion 200 is formed by connecting the first axis connecting portion 210 located at the other end (tip side) of the connecting shaft 70 and the second axis connecting portion 250 located at the end (tip side) of the rotor 30 in a state where a fitting structure 280 is formed and the two are connected in a detachable manner. In the following description, components common to the drive-side connecting portion 100 described above will be denoted by the same reference numerals, and detailed explanations will be omitted. In the following description, the configuration of each part constituting the rotor-side connecting portion 200 will be described while appropriately comparing it with that of the drive-side connecting portion 100.

[0068] As shown in Figures 4 and 8, the first shaft connecting portion 210 has substantially the same configuration as the first shaft connecting portion 110 provided on one end (base end) of the connecting shaft 70 described above. Specifically, the first shaft connecting portion 210 can be integrally formed as part of the connecting shaft 70 by machining the end of the connecting shaft 70, but in this embodiment, it is constructed by attaching a connecting portion component 212, which is formed separately from the connecting shaft 70, to the connecting shaft 70. Here, the connecting portion component 212 has the same configuration as the connecting portion component 112 described above in that it includes a component body 114, a flange portion 116, and a screw hole 118. On the other hand, the connecting portion component 212 differs in configuration from the first shaft connecting portion 110 described above in that it does not include a seal portion 120. The component body 114, flange portion 116, and screw hole 118 that constitute the connecting portion component 212 are the same as those of the first shaft connecting portion 110 described above, so a detailed explanation is omitted.

[0069] As shown in Figure 8, the second shaft connecting portion 250 is provided on the rotor 30 which forms the second shaft in the rotor-side connecting portion 200. The second shaft connecting portion 250 can also be constructed by an adapter or the like formed separately from the rotor 30 which forms the second shaft, similar to the second shaft connecting portion 150 provided in the drive-side connecting portion 100 described above, but in this embodiment it is formed as part of the rotor 30 by machining the end of the rotor 30. The second shaft connecting portion 250 has a connecting portion 262 and a recess 264.

[0070] The connecting portion 262 is used to connect to the flange portion 116 that constitutes the first shaft connecting portion 210. The connecting portion 262 is designed to have the same size in the radial direction as the flange portion 116 of the first shaft connecting portion 210. When the rotor-side connecting portion 200 is formed, the connecting portion 262 has a connecting end surface 262a that makes surface contact with the flange portion 116 of the first shaft connecting portion 210. The connecting portion 262 has a plurality (eight in this embodiment) of screw holes 262c that open into the connecting end surface 262a and are provided at equal intervals in the direction of the axis. The screw holes 262c are provided at positions corresponding to the fastening screw holes 118a provided in the flange portion 116 of the first shaft connecting portion 210.

[0071] The recess 264 is a concave portion that receives at least a part of the first shaft connecting portion 210. In this embodiment, the recess 264 is designed to receive and fit the protrusion 140 of the first shaft connecting portion 210. Specifically, the recess 264 has an inner diameter that is approximately the same as the outer diameter of the protrusion 140 and is concave in shape that is recessed in the axial direction from the connecting end face 262a of the connecting portion 262. The depth of the recess 264 (length in the axial direction from the connecting end face 262a) is greater than or equal to the amount of protrusion of the protrusion 140 on the first shaft connecting portion 210. With this configuration, the rotor-side connecting portion 200 can connect the connecting shaft 70 to the rotor 30 while fitting the recess 264 and the protrusion 140 together to form an spigot structure, and with the connecting end face 262a of the connecting portion 262 and the flange portion 116 in surface contact.

[0072] The rotor-side connecting portion 200 is formed by fitting and connecting the first shaft connecting portion 210 and the second shaft connecting portion 250 described above. Specifically, when connecting the connecting shaft 70 and the rotor 30, the protrusion 140 of the first shaft connecting portion 210 is inserted into the recess 264 of the second shaft connecting portion 250 to form a fitting structure 280. Furthermore, the flange portion 116 of the first shaft connecting portion 210 is in surface contact with the connecting portion 262 of the second shaft connecting portion 250, and the screw shaft 170s of the connecting bolt 170 is inserted through the fastening screw hole 118a and the screw hole 262c provided in the connecting portion 262 and screwed in, thereby connecting the first shaft connecting portion 210 and the second shaft connecting portion 250.

[0073] Furthermore, when disassembling the connecting shaft 70 and the rotor 30, the connecting bolt 170 is removed from the screw hole 262c in the rotor-side connecting portion 200, and the dummy bolt 171 installed in the fastening screw hole 118a is removed. The removed connecting bolt 170 is then fastened to the non-fastening screw hole 118b provided in the flange portion 116 of the first shaft connecting portion 210. When the connecting bolt 170 is rotated further in this state, the screw shaft 170s protrudes toward the connection portion 262 of the second shaft connecting portion 250. As a result, the screw shaft 170s presses against the connection end face 262a, causing the first shaft connecting portion 210 and the second shaft connecting portion 250 to move relative to each other in the axial direction so that they separate, and eventually the fitting structure 280, which was composed of the convex portion 140 and the concave portion 264, is released. In this way, the connection and fitting structure 280 of the first shaft connecting portion 210 and the second shaft connecting portion 250 is released, and the rotor-side connecting portion 200 is disassembled into the connecting shaft 70 and the rotor 30.

[0074] Because the single-screw eccentric pump 10 of this embodiment has the characteristic configuration described above, it can exhibit the following effects.

[0075] (A) As described above, the single-axis eccentric screw pump 10 of this embodiment comprises a flexible connecting shaft 70, a rotor 30 composed of a male screw-type shaft body, and a stator 20 through which the rotor 30 can be inserted and whose inner circumferential surface is formed in the shape of a female screw. The pump has a drive-side connecting portion 100 formed by directly or indirectly connecting first shaft connecting portions 110, 210 provided on the connecting shaft 70 and second shaft connecting portions 150, 250 provided on the drive shaft 56 which rotates in response to the output of the drive unit 55. Furthermore, the single-screw eccentric pump 10 is characterized in that a shaft sealing member 60 is provided on the drive shaft 56, and the second shaft connecting portion 150 is configured by attaching a detachable adapter 160 to the drive shaft 56 at a position away from the shaft sealing member 60 towards the axial end of the drive shaft 56, and the adapter 160 has an adapter enlarged diameter portion 162x that bulges out in a direction intersecting the axial direction of the drive shaft 56.

[0076] The single-screw eccentric pump 10 is configured such that, as shown in (A) above, an adapter 160 equipped with an adapter diameter enlargement portion 162x is attached to the drive shaft 56, thereby connecting the connecting shaft 70 and the drive shaft 56 via the adapter diameter enlargement portion 162x, which is larger in diameter than the drive shaft 56. This allows the single-screw eccentric pump 10 to firmly connect the connecting shaft 70 and the drive shaft 56.

[0077] Furthermore, since the single-shaft eccentric screw pump 10 has the configuration described in (A) above, by removing the adapter 160 from the drive shaft 56, the shaft seal member 60 can be removed from the drive shaft 56 or maintained without having to perform a major operation such as removing the drive shaft 56 from the drive unit 55. Accordingly, the single-shaft eccentric screw pump 10 allows the connecting shaft 70 and the drive shaft 56 to be connected via the adapter 160 at the drive-side connecting section 100, and also facilitates operations such as positioning the shaft seal member 60 relative to the drive shaft 56 and maintaining the shaft seal member 60.

[0078] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (A) above, but the present invention is not limited thereto, and the configuration can be modified as appropriate without departing from the spirit of the present invention. Furthermore, in the single-screw eccentric pump 10, the second shaft connecting portion 150 is configured by attaching the adapter 160 with the above-described configuration to the drive shaft 56, and the second shaft connecting portion 250 is configured without the adapter 160, but the present invention is not limited thereto. In addition to the second shaft connecting portion 150, the second shaft connecting portion 250 can also be configured with the adapter 160 in the same way as the second shaft connecting portion 150. Furthermore, similar to the adapter enlarged diameter portion 162x of the second shaft connecting portion 150, the second shaft connecting portion 250 can also be configured with an enlarged diameter portion that bulges out in a direction intersecting the axial direction of the rotor 30 more than the rotor 30.

[0079] (B) In this embodiment, the single-screw pump 10 is positioned in the axial direction of the drive shaft 56 by the shaft seal member 60 contacting the adapter enlarged diameter portion 162x at the second shaft connecting portion 150. With this configuration, the single-screw pump 10 can accurately position the shaft seal member 60 with respect to the adapter enlarged diameter portion 162x. As a result, the single-screw pump 10 of this embodiment does not require any positioning measures for the shaft seal member 60, such as using a dedicated positioning jig when installing the shaft seal member 60, thus simplifying the assembly process.

[0080] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (B) above, but the present invention is not limited thereto, and it is also possible to have a configuration that does not have the configuration described in (B) above. For example, the single-screw eccentric pump 10 can be configured such that the shaft seal member 60 can be positioned by another member instead of the adapter diameter enlargement portion 162x.

[0081] (C) In the above-described embodiment of the single-axis eccentric screw pump 10, the second shaft connecting parts 150, 250 connect the adapter 160 and the drive shaft 56 in a state in which a fitting structure 190 is formed. The second shaft connecting part 150 is equipped with an adapter fixing bolt 168 as an adapter release member for releasing the fitting structure 190, and a recessed screw hole 164e as an adapter release member installation part for providing the adapter fixing bolt 168. With this configuration, the single-axis eccentric screw pump 10 can be connected and disconnected in a state in which misalignment of the axial position is unlikely to occur. Furthermore, since the single-axis eccentric screw pump 10 is equipped with an adapter fixing bolt 168 and a recessed screw hole 164e, the work to release the fitting structure 190 between the adapter 160 and the drive shaft 56 can also be performed smoothly. Accordingly, in addition to the connection work between the adapter 160 and the drive shaft 56, the single-axis eccentric screw pump 10 of this embodiment can also be easily disconnected.

[0082] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (C) above, but the present invention is not limited thereto, and it is also possible to have a pump without the configuration described in (C) above. The single-screw eccentric pump 10 is equipped with both an adapter fixing bolt 168 as an adapter release member for releasing the fitting structure 190, and a recessed screw hole 164e as an adapter release member installation part for providing the adapter fixing bolt 168, but the present invention is not limited thereto, and for example, it is also possible to omit the adapter fixing bolt 168 and use another bolt that does not constitute the single-screw eccentric pump 10 as an adapter release member by mounting it in the recessed screw hole 164e to release the fitting structure 190.

[0083] (D) In ​​the single-screw pump 10 of this embodiment described above, the fitting structure 190 is constructed by clearance fitting. Therefore, the single-screw pump 10 can be easily disassembled and assembled, as the fitting structure 190 is composed of the adapter 160 and the drive shaft 56.

[0084] In this embodiment, an example is shown in which the fitting structure 190 is constructed by gap fitting. However, the present invention is not limited to this, and it is also possible to use fitting methods other than gap fitting.

[0085] (E) In the single-screw pump 10 of the above embodiment, the adapter fixing bolt 168 is equipped with a screw shaft 168s, and the recessed screw hole 164e is equipped with a screw that engages with the screw shaft 168s. Because the single-screw pump 10 is configured in this way, the adapter fixing bolt 168 can be firmly installed by the screwing force generated between the adapter fixing bolt 168 and the recessed screw hole 164e. Furthermore, by rotating the screw shaft 168s while screwing it into the recessed screw hole 164e, the screw shaft 168s can be moved back and forth in the axial direction, and the force generated thereby can be used to release the fitting structure 190. Therefore, the single-screw pump 10 can sufficiently apply the force necessary to release the fitting structure 190 by screwing the screw shaft 168s into the recessed screw hole 164e.

[0086] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (E) above, but the present invention is not limited thereto, and it is also possible to have a configuration that does not have the configuration described in (E) above. For example, the single-screw eccentric pump 10 may use a shaft body without threads or another member having an axial part as the adapter release member instead of the screw shaft 168s, and a through hole without threads may be used as the adapter release member installation part instead of the recessed screw hole 164e. In such a configuration, the single-screw eccentric pump 10 can release the fitting structure 190 by inserting the shaft body or the like used as the adapter release member into the through hole used as the adapter release member installation part, and applying an axial pressing force to the aforementioned shaft body in this state.

[0087] (F) In the above-described embodiment of the single-screw pump 10, the adapter 160 has a recess 164 that receives at least a part of the first shaft connecting portion 110, and adapter fixing bolts 168 that fix the adapter 160 to the drive shaft 56 are provided inside the recess 164. Since the single-screw pump 10 is configured so that the recess 164 provided to receive the first shaft connecting portion 110 can also be used as a space for housing the adapter fixing bolts 168, the number of components exposed to the outside of the adapter 160 can be minimized.

[0088] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (F) above, but the present invention is not limited thereto, and it is also possible to have a configuration that does not have the configuration described in (F) above. For example, the single-screw eccentric pump 10 may have a configuration in which the adapter fixing bolt 168 is placed outside the recess 164 rather than inside the recess 164.

[0089] (G) In the single-axis eccentric screw pump 10 of the above embodiment, the second shaft connecting part 150 connects the adapter 160 and the drive shaft 56 in a state in which a fitting structure 190 is formed, and the adapter fixing bolt 168 removed from the fixing point between the adapter 160 and the drive shaft 56 can be used as an adapter release member to release the fitting structure 190 in the second shaft connecting part 150. With this configuration, when disassembling the single-axis eccentric screw pump 10 into the adapter 160 and the drive shaft 56, the adapter fixing bolt 168 removed from the fixing point can be used as an adapter release member to release the fitting structure 190.Therefore, the single-axis eccentric screw pump 10 does not need to provide an adapter release member in addition to the adapter fixing bolt 168, and effects such as a reduction in the number of parts, a corresponding cost reduction, and an improvement in workability can be expected.

[0090] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (G) above, but the present invention is not limited thereto, and it is also possible to have a configuration that does not have the configuration described in (G) above. That is, the single-screw eccentric pump 10 does not use the adapter fixing bolt 168 as the adapter release member, but rather a member such as a bolt different from the adapter fixing bolt 168 is provided as the adapter release member.

[0091] (H) In this embodiment, the single-axis eccentric screw pump 10 has an adapter fixing bolt 168 equipped with a screw shaft 168s, and the adapter 160 has a recessed screw hole 164e that engages with the screw shaft 168s. By screwing the adapter fixing bolt 168, which has been removed from the fixing point between the adapter 160 and the drive shaft 56, into the recessed screw hole 164e and extending it toward the drive shaft 56, the screw 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 relative to each other in a direction that releases the fitting structure 190 in the second shaft connecting portion 150. Because the single-axis eccentric screw pump 10 is configured in this way, the fitting structure 190 can be released by utilizing the force generated by rotating and extending the screw shaft 168s.

[0092] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (H) above, but the present invention is not limited thereto, and it is also possible to have a pump that does not have the configuration described in (H) above.

[0093] (I) The single-screw pump 10 of this embodiment described above has a configuration in which the inside of the recess 164 is liquid-tight. As a result, the single-screw pump 10 can prevent fluid from flowing into the inside of the recess 164 and causing deterioration inside the recess 164, and prevents corrosion of the components disposed inside the recess 164 by the fluid.

[0094] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (I) above, but the present invention is not limited thereto, and it is also possible to have a configuration that does not have the configuration described in (I) above. That is, the single-screw eccentric pump 10 may not have a liquid-tight configuration for the recess 164, and may have a configuration that allows fluid to enter and exit. In this case, it is preferable to configure the single-screw eccentric pump 10 so that the recess 164 is easy to clean, or so that the fluid that flows into the recess 164 is smoothly discharged from the recess 164, so that fluid does not easily accumulate inside the recess 164.

[0095] (J) The single-screw eccentric pump 10 of this embodiment has connecting components 112 and 212 provided at the end of the connecting shaft 70, and the first shaft connecting components 110 and 210 are formed by fixing the connecting components 112 and 212 to the connecting shaft 70 with the end of the connecting shaft 70 inserted through the insertion portion 122 provided in the connecting components 112 and 212. Furthermore, the connecting component 112 is provided with a sealing portion 120 inside the recess 164 that seals the gap between the insertion portion 122 and the connecting shaft 70. With this configuration, the single-screw eccentric pump 10 can suppress the flow of fluid into the inside of the recess 164 through the gap formed between the insertion portion 122 provided in the connecting component 112 and the connecting shaft 70. As a result, the single-screw eccentric pump 10 can suppress the deterioration of fluid inside the recess 164 and corrosion of members disposed inside the recess 164 by the fluid.

[0096] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (J) above, but the present invention is not limited thereto, and it is also possible to have a configuration that does not have the configuration described in (J) above. That is, although the single-screw eccentric pump 10 is shown as having a seal portion 120 on the connecting portion component 112 that constitutes the first shaft connecting portion 110, the present invention is not limited thereto, and it is also possible to have a configuration without a seal portion 120. In the case of such a configuration, the single-screw eccentric pump 10 is more likely to have fluid flow into the recess 164 because there is no seal portion 120. For this reason, if the seal portion 120 is not provided, it is preferable to have a configuration in the single-screw eccentric pump 10 that makes it easy to clean the recess 164, or a configuration that allows fluid that has flowed into the recess 164 to be smoothly discharged from the recess 164, so that fluid does not easily accumulate inside the recess 164.

[0097] (K) The single-axis eccentric screw pump 10 of this embodiment comprises a flexible connecting shaft 70, a rotor 30 composed of a male screw-type shaft body, and a stator 20 through which the rotor 30 can be inserted and whose inner circumferential surface is formed in the shape of a female screw. A drive-side connecting portion 100 is formed which the connecting shaft 70 is directly or indirectly connected to a drive shaft 56 that rotates in response to the output of a drive unit 55, and a rotor-side connecting portion 200 is formed which the connecting shaft 70 is directly or indirectly connected to the rotor 30. This allows the rotational power output from the drive unit 55 to be transmitted to the stator 20 via the connecting shaft 70 and driven. Furthermore, in the single-shaft eccentric screw pump 10, the drive-side connecting part 100 and the rotor-side connecting part 200 are connected in a way that allows them to be disassembled by forming a fitting structure 180, 280 between the first shaft connecting parts 110, 210 provided on the first shaft (connecting shaft 70 in this embodiment), which is one of the two shafts to be connected, and the second shaft connecting parts 150, 250 provided on the drive shaft 56 and rotor 30, which are the other second shaft. Thus, in the single-shaft eccentric screw pump 10, the drive-side connecting part 100 and the rotor-side connecting part 200 are not simply connected to the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250 provided on the first and second shafts to be connected, but are connected in a way that allows them to be disassembled by forming a fitting structure 180, 280. Therefore, in the single-shaft eccentric screw pump 10 of this embodiment, the connecting shaft 70 can be connected to the rotor 30 and drive shaft 56 in a way that minimizes misalignment of the axial center position. Furthermore, in this embodiment, the single-screw eccentric pump 10 connects the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250 after forming a fitting structure 180, 280. Therefore, when disassembling the pump, the axial position of the first and second shafts is less likely to shift.

[0098] Furthermore, the single-screw eccentric pump 10 is equipped with a release member (connecting bolt 170 in this embodiment) for releasing the fitting structures 180, 280, and a release member installation section (non-fastening screw hole 118b in this embodiment) for installing the connecting bolt 170. Therefore, when disassembling the single-screw eccentric pump 10 of this embodiment into the first and second shafts, the work of releasing the fitting structures 180, 280 formed by the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250 can be smoothly performed using the connecting bolt 170. Accordingly, in addition to the connection work of the connecting shaft 70, the disassembly work of the single-screw pump 10 of this embodiment can also be easily performed.

[0099] In this embodiment, the single-screw eccentric pump 10 has fitting structures 180 and 280 formed on both the drive-side connecting portion 100 and the rotor-side connecting portion 200, and these are connected in a way that allows for disassembly. However, the present invention is not limited to this. The single-screw eccentric pump 10 may also be configured such that fitting structures 180 and 280 are not formed on either the drive-side connecting portion 100 or the rotor-side connecting portion 200.

[0100] Furthermore, while the single-screw eccentric pump 10 of this embodiment is equipped with both a release member for releasing the fitting structures 180, 280 and a release member installation section for providing the connecting bolt 170, the present invention is not limited thereto. The single-screw eccentric pump 10 may also be configured without either the release member for releasing the fitting structures 180, 280 or the release member installation section for providing the connecting bolt 170. For example, in this embodiment, the single-screw eccentric pump 10 is configured to be equipped with a release member by utilizing the connecting bolt 170 as the release member, but it is also possible to equip the non-fastening screw hole 118b with a bolt that is not part of the single-screw eccentric pump 10, or other parts or tools, etc., prepared separately from the connecting bolt 170, as a release member.

[0101] Furthermore, in this embodiment, an example is shown in which the connecting shaft 70 is the first shaft in the present invention, and the drive shaft 56 and rotor 30 are the second shafts. However, a configuration in which the connecting shaft 70 is the second shaft and the drive shaft 56 and rotor 30 are the first shafts is also possible. Moreover, the configuration exemplified as being provided on the first shaft in this embodiment and the configuration exemplified as being provided on the second shaft may be swapped.

[0102] (L) In the uniaxial eccentric screw pump 10 of the above embodiment, the connecting bolt 170 is equipped with a screw shaft 170s, and the non-fastening screw hole 118b is composed of a hole equipped with a screw that engages with the screw shaft 170s. Because the uniaxial eccentric screw pump 10 is configured in this way, the connecting bolt 170, which forms the release member, can be firmly installed by the screwing force generated between it and the non-fastening screw hole 118b, which forms the release member installation part. Furthermore, by screwing the screw shaft 170s, which forms the release member, into the non-fastening screw hole 118b, which forms the release member installation part, and rotating the screw shaft 170s, the screw shaft 170s can be moved back and forth in the axial direction, and the force generated thereby can be used to release the fitting structures 180, 280. Therefore, the single-screw eccentric pump 10 can sufficiently apply the force necessary to release the engagement in the fitting structures 180 and 280 by screwing the screw shaft 170s into the non-fastening screw hole 118b.

[0103] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (L) above, but the present invention is not limited thereto, and it is also possible to have a configuration that does not have the configuration described in (L) above. Furthermore, in this embodiment, the single-screw eccentric pump 10 has a screw receiving portion that forms the mounting portion for the release member, which is made up of a hole with a screw that engages with the screw shaft 170s, but the present invention is not limited thereto. For example, the single-screw eccentric pump 10 can have a screw receiving portion that forms the mounting portion for the release member, which is made up of a recess made up of a non-through hole or recess with a screw that engages with the screw shaft 170s.

[0104] In this embodiment, the single-screw eccentric pump 10 uses a connecting bolt 170 with a head in addition to the screw shaft 170s as the release member, but the present invention is not limited to this. For example, the single-screw eccentric pump 10 can also be constructed from a shaft or the like that has a screw shaft 170s but does not have a head.

[0105] (M) In this embodiment, the single-screw pump 10 is designed so that the fitting structures 180, 280 can be released by a release operation that involves a separation movement that separates the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250 in a direction along the axial direction of the connecting shaft 70. In addition, the non-fastening screw hole 118b is provided so that the screw shaft 170s can move back and forth in the axial direction of the connecting shaft 70. Therefore, by advancing the screw shaft 170s, the single-screw pump 10 can apply a pressing force to the second shaft connecting parts 150, 250 in a direction away from the first shaft connecting parts 110, 210, thereby separating the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250 relative to each other and releasing the fitting structure.

[0106] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (M) above, but the present invention is not limited thereto, and it is possible to have a configuration that does not have the configuration described in (M) above. Also, in this embodiment, the fitting structures 180 and 280 can be released by a separation operation that moves them apart in the direction along the axial direction of the connecting shaft 70, but the present invention is not limited thereto. For example, the fitting structures 180 and 280 can be released by a rotational operation of the connecting shaft 70 in the direction of the axis, or by movement in a direction intersecting the axis of the connecting shaft 70, in addition to, or instead of, a separation operation in the direction along the axial direction of the connecting shaft 70.

[0107] (N) In this embodiment, the single-axis eccentric screw pump 10 is provided with non-fastening screw holes 118b in the first shaft connecting parts 110 and 210, and by extending the screw shaft 170s, which is mounted in the non-fastening screw holes 118b, into contact with the second shaft connecting parts 150 and 250, the first shaft connecting parts 110 and 210 and the second shaft connecting parts 150 and 250 can be moved relative to each other in a direction that releases the fitting structures 180 and 280. As a result, the single-axis eccentric screw pump 10 can convert the rotational force that rotates the screw shaft 170s into a force in the axial direction of the connecting shaft 70 and utilize it to release the fitting structures 180 and 280.

[0108] In this embodiment, the single-screw eccentric pump 10 has the configuration described in (N) above, but the present invention is not limited thereto, and it is also possible to have a configuration that does not have the configuration described in (N) above. Furthermore, in this embodiment, the single-screw eccentric pump 10 exemplifies a configuration in which the rotational force of the screw shaft 170s in the direction of the axis is converted by the action of the screw into a thrust force in the axial direction of the screw shaft 170s, outputting a force for disengaging the fitting and enabling the fitting structures 180, 280 to be released, but the present invention is not limited thereto. For example, instead of the screw shaft 170s, a shaft body without a screw or another member having an axial part may be used as the disengaging member, and the non-fastening screw hole 118b may also be a through hole without a screw. In this configuration, the single-screw eccentric pump 10 can release the fitting structures 180 and 280 by inserting a shaft body used as a release member instead of the screw shaft 170s into a through hole used as a release member installation part instead of the non-fastening screw hole 118b, and applying an axial pressing force to the aforementioned shaft body in this state.

[0109] (O) In this embodiment, the single-screw eccentric pump 10 has a flange portion 116 that extends in a direction intersecting the axial direction of the connecting shaft 70, which constitutes the first shaft connecting portions 110 and 210 and is provided on the connecting shaft 70. The drive-side connecting portion 100 and the rotor-side connecting portion 200 are connected to the second shaft connecting portions 150 and 250 by attaching connecting bolts 170 across the flange portion 116 and the second shaft connecting portions 150 and 250, while the flange portion 116 is in surface contact with the second shaft connecting portions 150 and 250. As a result, the single-screw eccentric pump 10 can receive the moment acting in the axial and axial rotation directions due to eccentric rotation at the surface contact portion between the flange portion 116 that makes up the first shaft connecting portions 110 and 210 and the second shaft connecting portions 150 and 250. Therefore, the single-shaft eccentric screw pump 10 is less prone to rattling at the connection between the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250. Furthermore, even if the connecting shaft 70 rotates eccentrically during operation, the single-shaft eccentric screw pump 10 is less prone to fretting wear and damage due to stress concentration at the connection between the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250.

[0110] In this embodiment, the single-screw pump 10 has the configuration described in (O) above, but the present invention is not limited thereto, and it is possible to have a pump without the configuration described in (O) above. Also, in this embodiment, the single-screw pump 10 is shown as an example in which the connecting shaft 70 is the first shaft and the flange portion 116 is provided as constituting the first shaft connecting portion 110, 210, but the present invention is not limited thereto. The single-screw pump 10 can be configured in which the drive shaft 56 and the rotor 30 are the first shafts, and a flange portion equivalent to 116 is provided on either one or both of these. Also, in this embodiment, the single-screw pump 10 is shown as an example in which the flange portion 116 is provided as constituting the first shaft connecting portion 110, 210, and the flange portion 116 is connected by surface contact with the end faces of the second shaft connecting portion 150, 250, but the present invention is not limited thereto. The single-screw eccentric pump 10 can also be configured such that flange portions 116 similar to those in the first shaft connecting portions 110 and 210 are provided on the second shaft connecting portions 150 and 250, and the flange portions 116 are connected to these portions by surface contact. Furthermore, although this embodiment illustrates the provision of flange portions 116 as constituting the first shaft connecting portions 110 and 210, the single-screw eccentric pump 10 can also be configured without flange portions 116, for example, by providing other configurations to avoid fretting wear and stress concentration.

[0111] (P) The single-screw eccentric pump 10 described above is merely an example of one embodiment of the present invention, and its configuration can be appropriately modified without departing from the spirit of the present invention. For example, the single-screw eccentric pump 10 may be provided with a release member installation section that accepts the insertion of a release member into the gap between the first shaft connecting sections 110, 210 and the second shaft connecting sections 150, 250, in place of, or in addition to, the non-fastening screw hole 118b.

[0112] (Q) More specifically, the single-screw eccentric pump 10 is configured such that a groove is provided between the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250 as a fitting release member installation part.

[0113] By configuring the single-screw eccentric pump 10 as shown in (P) and (Q) above, it becomes possible to release the fitting structure 180, 280 by inserting a release member into the gap between the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250. For example, as shown in (Q) above, a release member installation section is provided between the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250 by a groove or the like for installing the release member, and by inserting a tool with a flat tip, such as a crowbar or a flathead screwdriver, into this groove as a release member, the fitting structure 180, 280 formed by the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250 can be released. Furthermore, the fitting structure 180, 280, formed by the first shaft connecting parts 110, 210 and the second shaft connecting parts 150, 250, can be released by using a tool configured to expand the distance between the pair of working pieces by applying an external force such as turning a screw, or by using a tool configured similarly to a gear puller.

[0114] Furthermore, in this embodiment, the connecting bolt 170 is used as the release member, and the non-fastening screw hole 118b that screws into the connecting bolt 170 is used as the release member installation part. The example given is that the fitting structures 180 and 280 can be released using the thrust force of the connecting bolt 170 generated by rotating the connecting bolt 170 while the two are screwed together. However, the present invention is not limited to this. For example, a screw receiving part consisting of a recess such as a screw hole or a hole with a screw, similar to the non-fastening screw hole 118b, may be provided as the release member installation part, and the fitting structures 180 and 280 can be released by inserting an eye bolt into the screw receiving part and pulling it with a chain block.

[0115] The present invention is not limited to the embodiments and modifications described above, and other embodiments may be possible in the spirit and teachings thereof, without departing from the scope of the claims. The components of the embodiments described above may be arbitrarily selected and combined. Furthermore, any component of the embodiments may be arbitrarily combined with any component described in the means for solving the invention, or any component that embodies any component described in the means for solving the invention. We intend to obtain rights for these as well in amendments or divisional applications of this application. [Industrial applicability]

[0116] The present invention is suitably applicable to all fluid discharge systems for pumping and discharging fluids. [Explanation of symbols]

[0117] 10: Single-screw eccentric pump 20: Status 30: Rotor 55: Drive unit 56: Drive shaft 60: Shaft sealing member 70:Connection shaft 100: Drive side coupling section 110: First shaft connection part 112:Connection component 116: Flange section 118b: Non-fastening screw hole (part for installing release mechanism) 120: Seal part 122: Insertion part 150:Second shaft connection part 160: Adapter 162x: Adapter diameter expansion section 164: Recess 164e: Recessed screw hole (adapter release member installation area) 168: Adapter fixing bolt (adapter release component) 168s: Screw shaft 170: Connecting bolt (removal member) 170s: Screw shaft 180: Interlocking structure 190: Interlocking structure 200: Rotor-side connecting section 210: First shaft connection part 212:Connection component 250:Second shaft connection part 280: Interlocking structure

Claims

1. A flexible connecting shaft, A rotor composed of a male screw-shaped shaft, The system includes a stator through which the rotor can be inserted and whose inner circumferential surface is formed in the shape of an internal screw, The drive-side connecting portion is formed by directly or indirectly connecting a first shaft connecting portion provided on the aforementioned connecting shaft and a second shaft connecting portion provided on the output shaft that rotates upon receiving output from the drive machine. The output shaft is provided with a shaft sealing member. The second shaft connecting portion is configured by attaching a detachable adapter to the output shaft at a position that is offset from the shaft sealing member towards the axial end of the output shaft, The adapter has an adapter diameter enlargement portion that bulges out in a direction intersecting the axial direction of the output shaft, A single-screw eccentric pump characterized in that, when the adapter is removed, the shaft sealing member is removable from the axial end side of the output shaft.

2. A flexible connecting shaft, A rotor composed of a male screw-shaped shaft, The system includes a stator through which the rotor can be inserted and whose inner circumferential surface is formed in the shape of an internal screw, The drive-side connecting portion is formed by directly or indirectly connecting a first shaft connecting portion provided on the aforementioned connecting shaft and a second shaft connecting portion provided on the output shaft that rotates upon receiving output from the drive machine. The output shaft is provided with a shaft sealing member. The second shaft connecting portion is configured by attaching a detachable adapter to the output shaft at a position that is offset from the shaft sealing member towards the axial end of the output shaft, The adapter has an adapter diameter enlargement portion that bulges out in a direction intersecting the axial direction of the output shaft, The first shaft connecting portion has a flange portion that extends in a direction intersecting the axial direction of the connecting shaft, A single-screw eccentric pump characterized in that the drive-side connecting portion is connected to the second shaft connecting portion with the flange portion in surface contact.

3. The single-screw eccentric pump according to claim 1 or 2, characterized in that, in the second shaft connecting portion, the shaft sealing member is positioned in the axial direction of the output shaft by contacting the adapter enlarged diameter portion.

4. The second shaft connecting portion connects the adapter and the output shaft in a fitted structure. A single-screw eccentric pump according to any one of claims 1 to 3, characterized in that it comprises at least one of an adapter release member for releasing the fitting structure in the second shaft connecting portion, and an adapter release member installation portion for providing the adapter release member.

5. The single-screw eccentric pump according to claim 4, characterized in that the fitting structure is constructed by gap fitting.

6. The adapter release member is equipped with a screw shaft, The adapter release member installation portion is a hole or recess equipped with a screw that engages with the screw shaft. A single-screw eccentric pump according to claim 4 or 5, characterized by the above.

7. The adapter has a recess that receives at least a portion of the first shaft connecting portion, A single-screw eccentric pump according to any one of claims 1 to 6, characterized in that a fixing member for fixing the adapter to the output shaft is provided inside the recess.

8. The second shaft connecting portion connects the adapter and the output shaft in a fitted structure. The single-screw eccentric pump according to claim 7, characterized in that the fixing member removed from the fixing point between the adapter and the output shaft can be used as an adapter release member for releasing the fitting structure in the second shaft connecting portion.

9. The aforementioned fixing member is equipped with a screw shaft, The adapter is provided with a screw receiving portion, which consists of a hole or recess with a screw that engages with the screw shaft forming the fixing member, as an adapter release member installation portion. The single-screw eccentric pump according to claim 8, characterized in that the fixing member removed from the fixing point between the adapter and the output shaft is screwed as the adapter release member into the screw receiving portion which forms the adapter release member installation portion and is extended toward the output shaft, thereby causing the screw shaft to come into direct or indirect contact with the output shaft, and allowing the adapter and the output shaft to move relative to each other in a direction that releases the fitting structure in the second shaft connecting portion.

10. A single-screw eccentric pump according to any one of claims 7 to 9, characterized in that the inside of the recess is liquid-tight.

11. The connecting shaft has a connecting component provided at its end, The first shaft connecting portion is formed by inserting the end of the connecting shaft into the insertion portion provided in the connecting portion structure and fixing the connecting portion structure to the connecting shaft. The single-screw eccentric pump according to claim 10, characterized in that the recess is provided with a sealing portion that seals the gap between the insertion portion and the connecting shaft.

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