JP7215829B2 - SHAFT COUPLING AND ROTATING DEVICE INCLUDING THE SHAFT COUPLING - Google Patents

Description

The present invention relates to a shaft coupling for connecting a prime mover and a rotating machine. The invention also relates to a rotating device comprising a prime mover and a rotating machine coupled by such a shaft coupling.

A shaft coupling is commonly used to connect the drive shaft of the electric motor and the rotary shaft of the pump. FIG. 16 is a schematic diagram showing an example of a conventional shaft coupling. As shown in FIG. 16, the shaft coupling has two split bodies 500 split along the axial direction. The two split bodies 500 are fastened together by a plurality of bolts 510 perpendicular to the axial direction. More specifically, in a state in which the drive shaft 520 of the electric motor and the rotary shaft 521 of the pump are sandwiched between two split bodies 500 , these split bodies 500 are fastened together with bolts 510 so that the shaft coupling becomes the drive shaft. It is fixed to both 520 and rotating shaft 521 .

With such a configuration, a flange for holding the bolt 510 is not required, so a compact shaft coupling with a small outer diameter is achieved. Further, the shaft coupling can be easily attached to the drive shaft 520 and the rotation shaft 521 by the bolt 510, and the shaft coupling can be easily removed from the drive shaft 520 and the rotation shaft 521 by removing the bolt 510.

Republic of China Patent Publication No. 515479 (U)

However, since the inner surfaces of the two split bodies 500, the outer surface of the electric motor drive shaft 520, and the outer surface of the pump rotary shaft 521 are processed separately, the electric motor drive shaft 520 and the pump rotary shaft 521 must be coaxially aligned. is extremely difficult. As an example, as shown in FIG. 17, each split body 500 is slightly inclined with respect to the axial direction, and surface contact between each split body 500 and drive shaft 520 and surface contact between each split body 500 and rotating shaft 521 Contact is difficult to establish. In the state shown in FIG. 17, the drive shaft 520 and the rotation shaft 521 are in line contact with the two divided bodies 500, and it is difficult to align the drive shaft 520 and the rotation shaft 521 coaxially.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a shaft coupling capable of minimizing misalignment between the drive shaft of a prime mover and the rotating shaft of a rotary machine. Another object of the present invention is to provide a rotary device comprising a prime mover and a rotary machine that are coupled by such a shaft coupling.

In one aspect, a shaft coupling for connecting a first shaft and a second shaft includes two split shafts each having a semi-cylindrical shaft holding surface capable of contacting the outer peripheral surface of the first shaft. a first screw for fastening the two split bodies together; a flange structure having an inner peripheral surface capable of contacting the outer peripheral surface of the second shaft; and a plurality of second screws for fixing the flange structure to the axial end faces of the two divisions, wherein the two divisions are semi-cylindrical The flange structure has a convex portion having an outer peripheral surface that fits into the semi-cylindrical inner surfaces of the two divided bodies, and the two divided bodies are: Each of the two divisions has a wall perpendicular to the axial center of the shaft coupling, the perpendicular wall is in contact with the end surface of the first shaft, and the first shaft of the two split bodies is provided. A coupling is provided characterized in that it has a fixed axial position with respect to the .

In one aspect, the first thread extends perpendicular to the axis of the coupling, and the plurality of second threads extend parallel to the axis of the coupling.
In one aspect, the first screws are a plurality of first screws arranged on both sides of the axial center of the shaft coupling.
In one aspect, the inner peripheral surface of the flange structure has a truncated cone shape .

In one aspect, there is provided a rotating device comprising a prime mover, a rotating machine, and the above-described shaft coupling coupling a drive shaft of the prime mover and a rotating shaft of the rotating machine.

According to the present invention, surface contact between the first shaft and the two divisions, surface contact between the second shaft and the flange structure, and fitting between the inner surfaces of the two divisions and the projections of the flange structure are achieved. are established at the same time. These surface contacts and fittings achieve accurate positioning of the first shaft, the two halves, the flange structure, and the second shaft, thus reducing misalignment between the first and second shafts. can be minimized. The first screw and the second screw are normal screws, not special screws such as reamer bolts used for positioning. Therefore, high precision is not required for the dimensions of the through holes into which the first screw and the second screw are inserted. As a result, an inexpensive shaft coupling can be achieved. Furthermore, by employing two split bodies, the shaft coupling can be fixed to the first shaft and the second shaft without axially moving the first shaft and the second shaft, and The coupling can be removed from the first shaft and the second shaft.

It is a front view showing one embodiment of a shaft coupling of the present invention. FIG. 2 is a side view of the shaft coupling viewed from the direction indicated by arrow A in FIG. 1; FIG. 2 is a longitudinal sectional view of the shaft coupling shown in FIG. 1; FIG. 3 is a longitudinal sectional view of the shaft coupling shown in FIG. 2; FIG. 10 illustrates one embodiment of a positioning structure for fixing the axial position of the two halves with respect to the first axis; FIG. 10 illustrates one embodiment of a positioning structure for fixing the axial position of the two halves with respect to the first axis; FIG. 10 illustrates one embodiment of a positioning structure for fixing the axial position of the two halves with respect to the first axis; 3 is a cross-sectional view taken along the line BB of FIG. 2 when the first screw and the second screw are removed; FIG. FIG. 3 is a cross-sectional view taken along line BB of FIG. 2 when two split bodies are fastened together by a first screw; FIG. 3 is a sectional view taken along the line CC of FIG. 2 when the first screw and the second screw are removed; FIG. 3 is a cross-sectional view taken along line CC of FIG. 2 when two split bodies are fastened together by a first screw; FIG. 12(a) is an exploded view of the flange structure and the second shaft, and FIG. 12(b) is an assembled view of the flange structure and the second shaft. 13(a) is an exploded view of a flange structure and a second shaft according to another embodiment, and FIG. 13(b) is an exploded view of the flange structure and the second shaft shown in FIG. 13(a). It is an assembly drawing. 14(a) is an exploded view of a flange structure and a second shaft according to yet another embodiment, and FIG. 14(b) is an exploded view of the flange structure and the second shaft shown in FIG. 14(a). It is an assembly drawing of. 1 shows a pumping device with an electric motor and a pump connected by a shaft coupling; FIG. It is a schematic diagram which shows an example of the conventional shaft coupling. It is a schematic diagram explaining the problem of the conventional shaft coupling.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a front view showing one embodiment of the shaft coupling of the present invention, FIG. 2 is a side view of the shaft coupling viewed from the direction indicated by arrow A in FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is a longitudinal sectional view of the shaft coupling, and FIG. 4 is a longitudinal sectional view of the shaft coupling shown in FIG. 2;

The shaft coupling 1 is used to connect the first shaft 101 and the second shaft 102 . In this embodiment, the first shaft 101 is the drive shaft of the prime mover and the second shaft 102 is the rotation shaft of the rotary machine. In one embodiment, the first shaft 101 may be the rotary shaft of a rotary machine and the second shaft 102 may be the drive shaft of a prime mover. Examples of prime movers include electric motors, diesel engines, gas turbine engines, and the like. Examples of rotating machines include fluid machines such as pumps and fans.

The shaft coupling 1 includes two split bodies 5 each having a semi-cylindrical shaft holding surface 5a capable of contacting the outer peripheral surface of the first shaft 101, and a plurality of first split bodies 5 for fastening the two split bodies 5 together. , a flange structure 10 having an inner peripheral surface 10a that can contact the outer peripheral surface of the second shaft 102, a fastening screw 15 for fixing the flange structure 10 to the second shaft 102, and a flange and a plurality of second screws 8 for fixing the structure 10 to the axial end faces 5b of the two divisions 5. As shown in FIG.

The two split bodies 5 and the flange structure 10 are made of metal such as carbon steel or stainless steel. Each split body 5 has a semi-cylindrical shape as a whole. The two split bodies 5 are split along the axial center CL of the shaft coupling 1 and each have a facing surface 5c parallel to the axial center CL. The two split bodies 5 are fastened to each other with the first screws 7 with the facing surfaces 5c facing each other. A gap is provided between the opposed surfaces 5c in order to increase the surface pressure of the shaft holding surface 5a against the first shaft 101. As shown in FIG.

The two split bodies 5 each have a semi-cylindrical inner surface 5e. The flange structure 10 has a convex portion 30 having an outer peripheral surface 30a that fits into the two semi-cylindrical inner surfaces 5e. The protrusion 30 is cylindrical. Further, the flange structure 10 has a flange portion 21 projecting radially outward from the convex portion 30 . The flange portion 21 is fixed to the axial end faces 5 b of the two split bodies 5 by the second screws 8 .

The coupling 1 has a set screw 17 and a set disc 18 . The positioning screw 17 and the positioning disc 18 are positioning structures for fixing the axial position of the two segments 5 with respect to the first axis 101 . A threaded hole (not shown) is formed in the end face of the first shaft 101 . The positioning disc 18 has a through hole (not shown) in its center, and the positioning screw 17 passes through the through hole of the positioning disc 18 and is screwed into the screw hole of the first shaft 101. . The positioning disc 18 is fixed to the end face of the first shaft 101 by a positioning screw 17 . The diameter of the positioning disc 18 is larger than the diameter of the end surface of the first shaft 101 , and the positioning disc 18 protrudes outward from the outer peripheral surface of the first shaft 101 . Inside each divided body 5, a stepped portion 5d is formed perpendicular to the axis CL. The axial position of the two segments 5 relative to the first shaft 101 is fixed by the contact between the positioning disc 18 and the stepped portion 5d of the segments 5 .

The positioning structure is not limited to the positioning screw 17 and positioning disc 18 of this embodiment. For example, as shown in FIG. 5, the positioning structure may be a wall 5f provided inside the split body 5 and perpendicular to the axial center CL of the joint 1. As shown in FIG. By bringing this wall 5f into contact with the end surface of the first shaft 101, the axial positions of the two split bodies 5 with respect to the first shaft 101 are fixed. Further, in another embodiment, the positioning structure may be a set screw 36 threaded into a threaded hole 37 formed in the split body 5, as shown in FIG. The tip of the set screw 36 is pressed against the outer peripheral surface of the first shaft 101 , thereby fixing the axial position of the divided body 5 with respect to the first shaft 101 . In another embodiment, as shown in FIG. 7, a wall 5f as a positioning structure is combined with a set screw 36, the set screw 36 functioning as a further fixation of the position of the segment 5 relative to the first axis 101. You may let

The first screw 7 extends perpendicular to the axial center CL of the shaft coupling 1 . Furthermore, the first screws 7 are symmetrically arranged on both sides of the axis CL and arranged along the axis CL. The first screw 7 is arranged symmetrically with respect to the axis CL. From the viewpoint of weight balance, the number of first screws 7 is an even number. In this embodiment, four first screws 7 are used. Specifically, two sets of first screws 7 are symmetrically arranged on both sides of the axis CL. Each set consists of two first screws 7, and the two first screws 7 of each set are arranged along the axis CL. In one embodiment, only one set of first screws 7 may be provided. In this case, two first screws 7 are arranged symmetrically on both sides of the axis CL. Furthermore, in one embodiment, six or more first screws 7 may be symmetrically arranged on both sides of the axis CL. The first screws 7 arranged on both sides of the axis CL can bring the semi-cylindrical shaft holding surfaces 5a of the two split bodies 5 into surface contact with the outer peripheral surface of the first shaft 101 without fail.

The second screw 8 extends parallel to the axial center CL of the shaft coupling 1 . The second screws 8 are evenly spaced around the axis CL. The fastening screw 15 passes through the washer 20 and is screwed onto the second shaft 102 . A threaded hole (described later) is formed in the end surface 102a of the second shaft 102 . The fastening screw 15 is screwed into a threaded hole of the second shaft 102 through a through hole (described later) formed in the washer 20 . The end portion of the outer peripheral surface of the second shaft 102 is composed of a tapered surface 103 . The inner peripheral surface 10 a of the flange structure 10 has a truncated cone shape that fits the tapered surface 103 of the second shaft 102 .

The end surface 102a of the second shaft 102 is positioned within the flange structure 10 when the inner peripheral surface 10a of the flange structure 10 is in contact with the tapered surface 103 of the second shaft 102 . Therefore, when the fastening screw 15 is tightened, the washer 20 is pressed against the end surface of the flange structure 10 by the fastening screw 15, and the inner peripheral surface 10a of the flange structure 10 is pressed against the tapered surface 103 of the second shaft 102 by the washer 20. be done. In this manner, the flange structure 10 is fixed to the second shaft 102 by the fastening screws 15 .

FIG. 8 is a cross-sectional view taken along line BB of FIG. 2 when the first screw 7 and the second screw 8 are removed. Each split body 5 is formed with a screw hole 22 into which the first screw 7 is screwed and a through hole 23 through which the first screw 7 passes. A semi-cylindrical shaft holding surface 5 a of the split body 5 has a shape that fits the outer peripheral surface of the first shaft 101 . That is, the radius of the shaft holding surface 5 a is substantially the same as the radius of the outer peripheral surface of the first shaft 101 . Two cutouts 5g for fixing the first screws 7 are formed on the outer peripheral surfaces of the two split bodies 5, respectively. These notches 5g are provided at symmetrical positions with respect to the axis CL for balance during rotation.

FIG. 9 is a cross-sectional view taken along the line BB in FIG. 2 when the two split bodies 5 are fastened together by the first screw 7. As shown in FIG. When the first screw 7 is inserted into the through hole 23 and screwed into the screw hole 22 with the facing surfaces 5c of the two divided bodies 5 facing each other, the shaft holding surfaces 5a of the two divided bodies 5 are It is in surface contact with the outer peripheral surface of the first shaft 101, while a gap is formed between the two opposing surfaces 5c. The surface contact between the shaft holding surface 5a and the outer peripheral surface of the first shaft 101 establishes centering (alignment) between the first shaft 101 and the two divided bodies 5. As shown in FIG.

FIG. 10 is a sectional view taken along line CC of FIG. 2 when the first screw 7 and the second screw 8 are removed. As shown in FIG. 10, the two split bodies 5 each have a semi-cylindrical inner surface 5e. Each semi-cylindrical inner surface 5 e has a shape that fits the outer peripheral surface 30 a of the protrusion 30 , and the radius of each semi-cylindrical inner surface 5 e is equal to the outer peripheral surface 30 a of the protrusion 30 of the flange structure 10 . substantially the same as radius. Therefore, the projection 30 fits into the cylindrical hole formed by the two semi-cylindrical inner surfaces 5e.

A through hole 33 through which the second screw 8 passes is formed in the flange portion 21 of the flange structure 10 . Threaded holes 35 are formed at positions corresponding to the positions of the through holes 33 in the axial end faces 5 b (see FIG. 4 ) of the two split bodies 5 . The second screw 8 is screwed into the threaded hole 35 through the through hole 33 .

FIG. 11 is a cross-sectional view taken along the line CC of FIG. 2 when the two split bodies 5 are fastened together by the first screw 7. As shown in FIG. As shown in FIG. 11 , when the two split bodies 5 are fastened with the first screw 7 , the two semi-cylindrical inner surfaces 5 e are fitted to the outer peripheral surface 30 a of the convex portion 30 of the flange structure 10 . Centering (alignment) between the two split bodies 5 and the flange structure 10 is established by fitting the two semi-cylindrical inner surfaces 5 e and the outer peripheral surface 30 a of the projection 30 .

12(a) is an exploded view of the flange structure 10 and the second shaft 102, and FIG. 12(b) is an assembled view of the flange structure 10 and the second shaft 102. FIG. The inner peripheral surface 10 a of the flange structure 10 has a truncated cone shape that fits the tapered surface 103 of the second shaft 102 . The washer 20 has a diameter larger than the diameter of the inner peripheral surface 10 a of the flange structure 10 . A washer 20 is arranged between the fastening screw 15 and the flange structure 10 . The washer 20 has a through hole 20a through which the fastening screw 15 passes. A threaded hole 104 into which the fastening screw 15 is screwed is formed in the end surface 102a of the second shaft 102 .

With the inner peripheral surface 10a of the flange structure 10 in contact with the tapered surface 103 of the second shaft 102, the fastening screw 15 is screwed into the threaded hole 104 of the second shaft 102 through the through hole 20a of the washer 20. 12(b), the washer 20 presses the truncated cone-shaped inner peripheral surface 10a of the flange structure 10 against the tapered surface 103 of the second shaft 102. As shown in FIG. At this time, the truncated cone-shaped inner peripheral surface 10 a comes into surface contact with the tapered surface 103 of the second shaft 102 . The end surface 102a of the second shaft 102 is positioned within the flange structure 10 when the truncated cone-shaped inner peripheral surface 10a is in surface contact with the tapered surface 103 of the second shaft 102 . The surface contact between the truncated cone-shaped inner peripheral surface 10a and the tapered surface 103 of the second shaft 102 establishes alignment between the flange structure 10 and the second shaft 102, and at the same time, the flange structure 10 with respect to the second axis 102 is achieved.

The combination of the truncated cone-shaped inner peripheral surface 10a of the flange structure 10 and the tapered surface 103 of the second shaft 102 can improve the concentricity between the flange structure 10 and the second shaft 102 . Furthermore, the combination of the truncated conical inner peripheral surface 10a of the flange structure 10 and the tapered surface 103 of the second shaft 102 facilitates the work of removing the flange structure 10 from the second shaft 102. can. In particular, even if rust occurs on the flange structure 10 and/or the second shaft 102, the entire flange structure 10 can be removed from the second shaft 102 simply by slightly displacing the flange structure 10 in the axial direction. can be separated.

The flange structure 10 to which the second shaft 102 shown in FIG. 12(b) is fixed is fastened to the divided body 5 with the second screws 8, as shown in FIG. At this time, the semi-cylindrical inner surfaces 5 e of the two divided bodies 5 are fitted to the outer peripheral surface 30 a of the convex portion 30 of the flange structure 10 . Centering (alignment) between the two split bodies 5 and the flange structure 10 is established by fitting the two semi-cylindrical inner surfaces 5 e and the outer peripheral surface 30 a of the projection 30 .

Since the second screw 8 extends parallel to the axial center CL of the coupling 1, the second screw 8 exerts a substantially radial force on the two segments 5 fastened by the first screw 7. do not have. Therefore, surface contact between the outer peripheral surface of the first shaft 101 and the shaft holding surface 5a of the divided body 5 is maintained when the second screw 8 is tightened. Furthermore, a second screw 8 parallel to the axis CL of the joint 1 can ensure torque transmission between the split body 5 and the flange structure 10 .

According to this embodiment, surface contact between the first shaft 101 and the two split bodies 5, surface contact between the second shaft 102 and the flange structure 10, and inner surfaces 5e of the two split bodies 5 and the flange structure At the same time the fit with the projection 30 of the body 10 is established. These surface contacts and fittings achieve accurate positioning of the first shaft 101, the two split bodies 5, the flange structure 10 and the second shaft 102, so that the first shaft 101 and the second shaft 102 Misalignment with the shaft 102 can be minimized. The first screw 7 and the second screw 8 are normal screws, not special screws such as reamer bolts used for positioning. Therefore, high precision is not required for the dimensions of the through holes 23 and 33 into which the first screw 7 and the second screw 8 are inserted. As a result, an inexpensive shaft coupling 1 can be achieved. Furthermore, by adopting two split bodies 5, the shaft coupling 1 is fixed to the first shaft 101 and the second shaft 102 without moving the first shaft 101 and the second shaft 102 in the axial direction. and the coupling 1 can be removed from the first shaft 101 and the second shaft 102 .

13(a) is an exploded view of the flange structure 10 and the second shaft 102 according to another embodiment, and FIG. 13(b) is an exploded view of the flange structure 10 and the second shaft 102 shown in FIG. 13(a). 1 is an assembly diagram of the shaft 102 of FIG. The configuration of this embodiment, which is not particularly described, is the same as the configuration shown in FIGS. In this embodiment, the inner peripheral surface 10a of the flange structure 10 has a cylindrical shape instead of a truncated cone shape. The second shaft 102 also does not have a tapered surface 103 and instead has a cylindrical surface 107 . One end of the cylindrical surface 107 is connected to the end surface 102a of the second shaft 102, and the other end of the cylindrical surface 107 is connected to a stepped portion 108 protruding radially outward.

The diameter of the inner peripheral surface 10 a of the flange structure 10 is substantially the same as the diameter of the cylindrical surface 107 of the second shaft 102 . Therefore, when the flange structure 10 is fitted onto the second shaft 102 , the inner peripheral surface 10 a of the flange structure 10 comes into surface contact with the cylindrical surface 107 of the second shaft 102 . The surface contact between the inner peripheral surface 10a of the flange structure 10 and the cylindrical surface 107 of the second shaft 102 establishes centering (alignment) between the flange structure 10 and the second shaft 102 . Further, when the fastening screw 15 is screwed into the threaded hole 104 of the second shaft 102 through the through hole 20a of the washer 20, the washer 20 moves the flange structure 10 to the second shaft as shown in FIG. 13(b). 102 against shoulder 108 , thereby securing flange structure 10 to second shaft 102 . At the same time, axial positioning of the flange structure 10 relative to the second axis 102 is achieved.

14(a) is an exploded view of the flange structure 10 and the second shaft 102 according to yet another embodiment, and FIG. 14(b) is an exploded view of the flange structure 10 and the second shaft 102 shown in FIG. 14(a). 2 is an assembly diagram of the shaft 102 of No. 2. FIG. The configuration of this embodiment, which is not particularly described, is the same as the configuration shown in FIGS. In this embodiment, a set screw arranged in the flange structure 10 is used as the fastening screw 15 . A fastening screw 15 , which is a set screw, is screwed into a radially extending threaded hole 41 of the flange structure 10 . In this embodiment, washer 20 is not used.

Also in the present embodiment, centering (alignment) between the flange structure 10 and the second shaft 102 is established by surface contact between the inner peripheral surface 10a of the flange structure 10 and the cylindrical surface 107 of the second shaft 102. be done. Furthermore, when the fastening screw 15 is screwed into the threaded hole 41 of the flange structure 10 while the flange structure 10 is in contact with the stepped portion 108 of the second shaft 102, the flange structure 10 is screwed into the flange structure 10 as shown in FIG. The structure 10 is fixed to the second axis 102 and at the same time axial positioning of the flange structure 10 with respect to the second axis 102 is achieved.

Next, the process of attaching the shaft coupling 1 shown in FIGS. 1 to 14 to the first shaft 101 and the second shaft 102 will be described. First, as shown in FIG. 12(b), FIG. 13(b), or FIG. Next, with the first shaft 101 and the flange structure 10 sandwiched between the two split bodies 5 , the two split bodies 5 are fastened together with the first screws 7 . At this time, the shaft holding surfaces 5a of the two divided bodies 5 are in surface contact with the outer peripheral surface of the first shaft 101, and the semi-cylindrical inner surfaces 5e of the two divided bodies 5 are in contact with the convex portions 30 of the flange structure 10. is fitted to the outer peripheral surface 30a of the . Then, the flange structure 10 is fastened to the two divisions 5 with the second screw 8 . This completes the attachment of the shaft coupling 1 to the first shaft 101 and the second shaft 102 .

In this way, by first fixing the flange structure 10 to the second shaft 102 and then fixing the two divided bodies 5 to the first shaft 101, the first shaft 101 and the second shaft 102 is not required to move axially. Therefore, even if both or one of the first shaft 101 and the second shaft 102 cannot be moved in the axial direction, or even if it is not preferable to move the shaft in the axial direction, the coupling 1 can be moved to the first shaft. can be attached to the shaft 101 and the second shaft 102 of the

When removing the shaft coupling 1 from the first shaft 101 and the second shaft 102, first, the second screw 8 is removed. The first screw 7 is then removed and the two split bodies 5 are removed from the first shaft 101 and the flange structure 10 . Then, the flange structure 10 is removed from the second shaft 102 by removing the fastening screw 15 . Also when the coupling 1 is removed from the first shaft 101 and the second shaft 102, it is unnecessary to move both or one of the first shaft 101 and the second shaft 102 in the axial direction.

FIG. 15 is a diagram showing a pump device having an electric motor 110 and a pump 111 connected by the shaft coupling 1 described above. The pump device shown in FIG. 15 is an example of a rotating device that includes a prime mover and a rotating machine. In the embodiment shown in FIG. 15, the drive shaft of the electric motor 110 corresponds to the first shaft 101, and the rotation shaft of the pump 111 corresponds to the second shaft 102 described above. In one embodiment, the drive shaft of the electric motor 110 may correspond to the second shaft 102 above, and the rotary shaft of the pump 111 may correspond to the first shaft 101 above. In the following description, reference numeral 101 denotes the drive shaft of the electric motor 110 and reference numeral 102 denotes the rotary shaft of the pump 111 .

The pump device has a pump 111 for pressurizing liquid, an electric motor 110 for driving the pump 111 , and the shaft coupling 1 connecting the electric motor 110 and the pump 111 . The shaft coupling 1 is fixed to the drive shaft 101 of the electric motor 110 and the rotating shaft 102 of the pump 111 . A drive shaft 101 of the electric motor 110 is connected to a rotating shaft 102 of a pump 111 by a shaft coupling 1 . The pump 111 includes an impeller 115 fixed to the rotating shaft 102, a pump casing 117 that houses the impeller 115, and a mechanical seal 120 as a shaft sealing device that seals a gap between the rotating shaft 102 and the pump casing 117. It has The pump casing 117 has a liquid suction port 117a and a liquid discharge port 117b.

Torque of the electric motor 110 is transmitted to the pump 111 via the shaft coupling 1, and the impeller 115 rotates together with the rotating shaft 102. As the impeller 115 rotates, the liquid is sucked into the pump casing 117 through the suction port 117a, pressurized in the pump casing 117, and discharged from the discharge port 117b.

The mechanical seal 120 generally includes a rotating side sliding member fixed to the rotary shaft 102, a stationary side sliding member fixed to the pump casing 117, and one of the rotating side sliding member and the fixed side sliding member. has a spring that forces one against the other. Since the rotating side sliding member rotates together with the rotating shaft 102 and slides on the stationary side sliding member, the mechanical seal 120 can minimize leakage of liquid from the pump casing 117 .

As described above, the mechanical seal 120 has a rotary-side sliding member and a fixed-side sliding member that are in sliding contact with each other, so the mechanical seal 120 needs to be periodically replaced with a new one. Replacement of the mechanical seal 120 is performed as follows. First, the shaft coupling 1 is removed from the drive shaft 101 of the electric motor 110 and the rotating shaft 102 of the pump 111 according to the procedure described above. Next, the mechanical seal 120 is pulled up along the rotary shaft 102 of the pump 111 and removed from the space between the drive shaft 101 of the electric motor 110 and the rotary shaft 102 of the pump 111 . Then, a new mechanical seal is inserted into the space between the drive shaft 101 of the electric motor 110 and the rotary shaft 102 of the pump 111 and pushed down along the rotary shaft 102 of the pump 111 . After fixing the mechanical seal at a predetermined position, the shaft coupling 1 is fixed to the drive shaft 101 of the electric motor 110 and the rotary shaft 102 of the pump 111 according to the procedure described above.

The shaft coupling 1 according to this embodiment can not only improve the concentricity between the drive shaft 101 of the electric motor 110 and the rotation shaft 102 of the pump 111, but also can can be fixed to and removed from these two shafts 101, 102 without axially displacing the .

The above-described embodiments are described for the purpose of enabling a person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiments can be made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the present invention is not limited to the described embodiments, but is to be construed in its broadest scope in accordance with the technical spirit defined by the claims.

Reference Signs List 1 shaft coupling 5 divided body 5a shaft holding surface 5b axial end surface 5c facing surface 5d step portion 5e inner surface 5f wall 5g notch 7 first screw 8 second screw 10 flange structure 10a inner peripheral surface 15 fastening screw 17 positioning Screw 18 Positioning disk 20 Washer 21 Flange 22 Screw hole 23 Through hole 30 Projection 30a Outer peripheral surface 33 Through hole 35 Screw hole 36 Set screw 37 Screw hole 41 Screw hole 101 First shaft 102 Second shaft 103 Tapered surface 104 screw hole 107 cylindrical surface 108 stepped portion 110 electric motor 111 pump 115 impeller 117 pump casing 120 mechanical seal

Claims (7)

A shaft coupling for connecting a first shaft and a second shaft,
two divided bodies each having a semi-cylindrical shaft holding surface capable of contacting the outer peripheral surface of the first shaft;
a first screw for fastening the two split bodies together;
a flange structure having an inner peripheral surface capable of contacting the outer peripheral surface of the second shaft;
a fastening screw for fixing the flange structure to the second shaft;
a plurality of second screws for fixing the flange structure to the axial end faces of the two halves;
The two split bodies each have a semi-cylindrical inner surface,
The flange structure has a convex portion having an outer peripheral surface that fits into the semi-cylindrical inner surface of the two divided bodies ,
The two split bodies each have a wall perpendicular to the axial center of the shaft coupling inside thereof,
A shaft coupling, wherein the vertical wall is in contact with the end face of the first shaft and fixes the axial positions of the two split bodies with respect to the first shaft. 3. The first screw extends perpendicular to the axial center of the shaft coupling, and the plurality of second screws extend parallel to the axial center of the shaft coupling. 1. The shaft coupling according to 1. 3. The shaft coupling according to claim 2, wherein the first screws are a plurality of first screws arranged on both sides of the axial center of the shaft coupling. 4. The shaft coupling according to any one of claims 1 to 3, wherein the inner peripheral surface of the flange structure has a truncated cone shape. 5. The shaft coupling according to claim 4, wherein said outer peripheral surface of said second shaft comprises a tapered surface that conforms to said truncated cone shape. 6. The shaft coupling according to claim 5, wherein said inner peripheral surface of said flange structure is pressed against said tapered surface by said fastening screw. a prime mover;
a rotating machine;
A rotating device comprising the shaft coupling according to any one of claims 1 to 6 , which couples the driving shaft of the prime mover and the rotating shaft of the rotating machine.

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