JP2023028260A - Joint device for reciprocation pump - Google Patents

Abstract

To provide a joint device for a reciprocation pump which can allow (absorb) not only relative inclination between a driving shaft and a driven shaft but also eccentricity between the driving shaft and the driven shaft.SOLUTION: A joint device 1 for connecting a driving source with a reciprocating pump includes: a first thrust member 3 having a first recessed surface 3a; a second thrust member 5 having a second recessed surface 5a; a spherical object 7 sandwiched between the first recessed surface 3a and the second recessed surface 5a; and a housing 11 having an internal space 10 which houses the first thrust member 3, the second thrust member 5, and the spherical object 7. The first thrust member 3 and the second thrust member 5 are arranged along a center axis CL of the housing 11. A width of the internal space 10 is larger than widths of the first thrust member 3, the second thrust member 5, and the spherical object 7.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coupling device used to drive reciprocating pumps such as plunger pumps and piston pumps.

The reciprocating pump is connected to a drive source (for example, air cylinder or hydraulic cylinder) through a coupling device. The reciprocating motion of the drive source is transmitted to the piston of the reciprocating pump through the joint device, and the piston reciprocates. Ideally, the drive shaft on the drive source side and the driven shaft on the reciprocating pump side should be aligned in a straight line to prevent mechanical damage and extend the life of the pump. This is because, while the loss in performance is smaller in that case, misalignment of the core tends to cause unintended contact of parts, friction/wear, and galling.

However, in order to align the drive shaft and the driven shaft, a high degree of machining accuracy and a great deal of effort are required in assembling the device, which requires equipment and man-hours. Therefore, joint devices used in reciprocating pumps have eccentricity (i.e., difference in relative axial center position between the drive shaft and driven shaft) and deflection (i.e., , relative inclination between the drive shaft and the driven shaft), there is a need for a structure capable of absorbing the displacement between the drive shaft and the driven shaft.

JP 2007-263257 A

A universal joint is an example of a joint device that can allow a deviation angle between the drive shaft and the driven shaft. However, the universal joint does not have a structure that can withstand a high thrust load transmitted from the drive shaft to the driven shaft. Therefore, if the reciprocating pump is operated for a long time, the universal joint may be damaged.

Furthermore, in addition to the angular deviation between the drive shaft and the driven shaft, there may be eccentricity between the drive shaft and the driven shaft. Such eccentricity is caused by relative positional deviation between the driving source and the reciprocating pump. Conventional joint devices such as universal joints cannot allow (absorb) such eccentricity.

Patent Literature 1 discloses a joint device that copes with the angular deviation and eccentricity of the drive shaft and the driven shaft. In this joint device, gaps are provided at the top and bottom in order to provide margin for the angle of deflection and eccentricity. As a result, the stroke length of the driven shaft is shorter than the stroke length of the drive shaft by the amount of the gap. , the volume on the pump side is reduced, resulting in poor pump efficiency. In addition, each time the axial reciprocating motion is performed, axially adjacent members repeatedly collide with each other, causing vibration and noise, and on the contrary, wear and fatigue fracture of the colliding portions of the members are likely to occur.

INDUSTRIAL APPLICABILITY The present invention is for a reciprocating pump that can allow (absorb) not only the eccentricity between the drive shaft and the driven shaft, but also the eccentricity between the drive shaft and the driven shaft, and further improve the pump efficiency. provides a coupling device for

In one aspect, a joint device for connecting a drive source and a reciprocating pump, comprising: a first thrust member having a first concave surface; a second thrust member having a second concave surface; and a housing having an internal space for housing the first thrust member, the second thrust member, and the sphere, wherein the first thrust member and the second thrust member A joint device is provided, arranged along the central axis of the housing, wherein the width of the inner space is greater than the width of the first thrust member, the second thrust member and the sphere.

In one aspect, the first concave surface and the second concave surface are concave spherical surfaces having the same radius of curvature as the outer surface of the sphere.
In one aspect, the first thrust member, the second thrust member, and the sphere are eccentric with respect to the central axis of the housing.
In one aspect, the second thrust member has a second planar surface and the housing has a planar seat in surface contact with the second planar surface.
In one aspect, the housing is fixed to a first shaft extending from one of the drive source and the reciprocating pump, and the sphere is fixed to a second shaft extending from the other of the drive source and the reciprocating pump. It is
In one aspect, the housing has a threaded hole that communicates with the internal space, and a male threaded portion formed on the outer peripheral surface of the first shaft is screwed into the threaded hole.
In one aspect, the first thrust member has a first flat surface, and the first flat surface contacts the end surface of the first shaft.
In one aspect, the second thrust member has a structure divided into a plurality of members.

According to the present invention, the efficiency of the pump is increased because there is no gap in the axial direction due to the structure, although the range of response to the deflection angle and eccentricity can be given a margin. In addition, since repeated collisions between members adjacent in the axial direction are eliminated, vibration and noise do not occur, and wear and fatigue failure of members at collision points are less likely to occur, preventing mechanical damage and extending the life. becomes possible.
Also, the first thrust member and the second thrust member contacting the sphere can be tilted relative to each other. Furthermore, since the width of the internal space is greater than the width of the first thrust member, the second thrust member, and the sphere, the first thrust member, the second thrust member, and the sphere can be eccentric with respect to the housing. can. Therefore, when a first shaft (for example, a driving shaft) is fixed to the housing and a second shaft (for example, a driven shaft) is fixed to the sphere, the joint device provides a deflection angle and a deflection angle between the first shaft and the second shaft. Both cores can be tolerated (absorbed).

FIG. 4 is a cross-sectional view showing one embodiment of a coupling device for connecting a drive source and a reciprocating pump; FIG. 4 is a diagram showing how a second shaft fixed to a sphere is tilted with respect to a first shaft fixed to a housing; FIG. 4 is a diagram showing how a second shaft fixed to a sphere is eccentric with respect to a first shaft fixed to a housing. FIG. 4 is a schematic diagram showing how the joint device and the first and second shafts connected thereto reciprocate. FIG. 4 is a cross-sectional view showing another embodiment of a joint device;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of a joint device for connecting a drive source and a reciprocating pump. The joint device 1 includes a first thrust member 3 having a first concave surface 3a, a second thrust member 5 having a second concave surface 5a, a spherical body 7 sandwiched between the first concave surface 3a and the second concave surface 5a, and a second thrust member 5 having a second concave surface 5a. It comprises a housing 11 having an interior space 10 containing one thrust member 3 , a second thrust member 5 and a sphere 7 .

The first thrust member 3 and the second thrust member 5 are arranged along the central axis CL of the housing 11 . More specifically, the first thrust member 3 , the sphere 7 , and the second thrust member 5 are arranged in a line along the central axis CL of the housing 11 . The first thrust member 3, the sphere 7, and the second thrust member 5 are made of a hard material such as metal or ceramic.

The housing 11 is fixed to a first shaft 15 extending from one of a drive source (e.g. air cylinder or hydraulic cylinder) and a reciprocating pump (e.g. plunger pump or piston pump), and the sphere 7 is attached to one of the drive source and the reciprocating pump. is fixed to a second shaft 16 extending from the other of the The sphere 7 has a shank 7b extending from its spherical outer surface 7a which extends through the second thrust member 5 to the second shaft 16. As shown in FIG. The housing 11 has a through hole 11a through which the shaft portion 7b and the second shaft 16 pass. The width of the through hole 11 a is larger than the width (diameter) of the second shaft 16 .

The housing 11 has a threaded hole 19 communicating with the internal space 10 . A male threaded portion 20 formed on the outer peripheral surface of the first shaft 15 is screwed into the screw hole 19 . The first thrust member 3 has a first flat surface 3 b that is always in contact with the end surface of the first shaft 15 . The end surface of the first shaft 15 is perpendicular to the central axis CL, and the first flat surface 3b is perpendicular to the central axis CL of the housing 11 while being in contact with the end surface of the first shaft 15 . A shim (or spacer) may be interposed between the first flat surface 3b of the first thrust member 3 and the end surface of the first shaft 15 in order to adjust the distance between the drive shaft and the piston of the reciprocating pump.

The first concave surface 3 a and the second concave surface 5 a are hollow spherical surfaces having the same radius of curvature as the outer surface 7 a of the sphere 7 . The first concave surface 3a is circular, and the second concave surface 5a is annular with a hole substantially in the center. The spherical body 7 is slidably supported by both the first concave surface 3 a of the first thrust member 3 and the second concave surface 5 a of the second thrust member 5 . The first concave surface 3a and the second concave surface 5a are always in surface contact with the outer surface 7a of the sphere 7 during the reciprocating motion. Therefore, the sphere 7 can tilt with respect to the housing 11 , the first thrust member 3 and the second thrust member 5 while maintaining its relative position with respect to the housing 11 . As a result, the second axis 16 fixed to the sphere 7 can be tilted with respect to the first axis 15 fixed to the housing 11, as shown in FIG.

In particular, according to this embodiment, the entire first concave surface 3a and the entire second concave surface 5a are always in contact with the spherical outer surface 7a of the sphere 7, so that the joint device 1 is in contact with the joint device 1 during reciprocating motion. It can withstand a high load applied, and the spherical body 7 can tilt smoothly with respect to the first thrust member 3 and the second thrust member 5 . Furthermore, the first concave surface 3a and the second concave surface 5a are arranged along the direction of the center axis CL of the housing 11 (that is, along the reciprocating direction) so as to sandwich the sphere 7, so that the reciprocating motion Even when the joint device 1 is moving in the direction of , the ball 7 is supported by both the first concave surface 3a and the second concave surface 5a, and the ball 7 smoothly moves against the first thrust member 3 and the second thrust member 5. can tilt. As a result, the second shaft 16 fixed to the sphere 7 can tilt smoothly with respect to the first shaft 15 fixed to the housing 11 during the reciprocating motion.

The width of the internal space 10 of the housing 11 is greater than the widths of the first thrust member 3, the second thrust member 5, and the sphere 7. As shown in FIG. Here, the “width” refers to the dimension in the direction perpendicular to the central axis CL of the housing 11 . As shown in FIG. 3 , the first thrust member 3 , the second thrust member 5 , and the sphere 7 can be integrally eccentric with respect to the central axis CL of the housing 11 . That is, the positions of the first thrust member 3 , the second thrust member 5 , and the spherical body 7 in the direction perpendicular to the central axis CL are variable within the internal space 10 of the housing 11 . As a result, the second shaft 16 fixed to the sphere 7 can be eccentric with respect to the first shaft 15 fixed to the housing 11 .

The second thrust member 5 has a second flat surface 5b and the housing 11 has a flat seat 24 in surface contact with the second flat surface 5b. The second flat surface 5b is an annular surface. The second flat surface 5 b and the seat 24 are perpendicular to the central axis CL of the housing 11 . The second flat surface 5b and the seat 24 are always in contact. The seat 24 only supports the second flat surface 5 b and does not prevent the second thrust member 5 from shifting or moving in the direction perpendicular to the center axis CL of the housing 11 . Both the first flat surface 3 b of the first thrust member 3 and the second flat surface 5 b of the second thrust member 5 are perpendicular to the central axis CL of the housing 11 . As described above, the end surface of the first shaft 15, the first flat surface 3b, the first concave surface 3a, the sphere 7, the second concave surface 5a, the second flat surface 5b, and the seat 24 are adjacent to each other in the direction of the central axis CL. Since the first flat surface 3b and the second flat surface 5b are arranged so as to be in constant contact with the member to which the first thrust member 3, the sphere 7 and the second thrust member 5 move in the direction perpendicular to the central axis line CL, the first flat surface 3b and the second flat surface 5b Misalignment or movement can be guided.

FIG. 4 is a schematic diagram showing how the joint device 1 and the first shaft 15 and the second shaft 16 connected thereto reciprocate. In FIG. 4 the joint device 1 is depicted schematically. In the example shown in FIG. 4, the first shaft 15 is the drive shaft connected to the drive source 31, and the second shaft 16 is the driven shaft connected to the reciprocating pump 32. Not limited.

As shown in FIG. 4, when the drive source 31 and the reciprocating pump 32 are tilted with respect to each other, the second shaft 16 can be tilted with respect to the first shaft 15 by the joint device 1 during the reciprocating motion. The movement of the two shafts 16 is not restricted by the reciprocating pump 32, and as a result the stroke of the reciprocating pump 32 can be increased.

Returning to FIG. 1, in this embodiment, an annular latch 27 is fitted in the upper portion of the second thrust member 5 . The second thrust member 5 of this embodiment has a structure divided into a plurality of members, and the latch 27 is for fixing the relative positions of these members. In one example, the second thrust member 5 has a split structure composed of two semi-annular members, and the relative position of these two semi-annular members is fixed by a latch 27 . The second thrust member 5 may be divided into three or more members.

Housing 11 has an opening 11b formed in its side wall. This opening 11b is used for maintenance and/or assembly of the first thrust member 3 and the second thrust member 5, or the like.

Next, an embodiment of a method for assembling the joint device 1 configured as described above will be described. First, with the first shaft 15, the first thrust member 3, and the second thrust member 5 removed from the housing 11, the sphere 7 to which the second shaft 16 is fixed is inserted through the through hole 11a of the housing 11 into the internal space. Insert in 10. Two semi-annular members constituting the second thrust member 5 are inserted into the internal space 10 from the opening 11b of the housing 11, and a latch 27 is fitted to the two semi-annular members from above the sphere 7, thereby The second thrust member 5 is constructed by fixing the relative positions of the two semi-annular members. Next, the first thrust member 3 is put into the internal space 10 through the opening 11 b of the housing 11 or the screw hole 19 and placed on the sphere 7 . Further, the entire housing 11 is rotated around its central axis CL, and the threaded hole 19 of the housing 11 is moved toward the first shaft until the first flat surface 3b of the first thrust member 3 contacts the end surface of the first shaft 15. 15 is screwed into the male screw portion 20 . With the first flat surface 3b of the first thrust member 3 in contact with the end surface of the first shaft 15, the anti-rotation screw 35 is screwed into the second screw hole 11c formed in the side wall of the housing 11, so that the housing 11 and the first shaft 15 are connected. The relative position with the axis 15 is fixed. This completes the assembly of the joint device 1 .

When replacing the first thrust member 3 and/or the second thrust member 5, first, the entire housing 11 is rotated in the opposite direction so that the first flat surface 3b of the first thrust member 3 is aligned with the first shaft 15. away from the end face. The first thrust member 3 can be taken out from the opening 11 b of the housing 11 . When removing the second thrust member 5 , first, the latch 27 is removed from the second thrust member 5 . Then, the two semi-annular members forming the second thrust member 5 can be removed from the opening 11 b of the housing 11 .

FIG. 5 is a cross-sectional view showing another embodiment of the joint device 1. FIG. The configuration and operation of this embodiment, which are not specifically described, are the same as those of the embodiment described with reference to FIGS. 1 to 4, so redundant description thereof is omitted.

As shown in FIG. 5, in this embodiment, the ball 7 is detachably fixed to the second shaft 16 by a screw structure. More specifically, a male thread 40 is formed on the shaft portion 7b of the ball 7, and a threaded hole 42 is formed on the end surface of the second shaft 16. As shown in FIG. The ball 7 can be fixed to the second shaft 16 by screwing the external thread 40 of the ball 7 into the threaded hole 42 of the second shaft 16 . Furthermore, the ball 7 can be separated from the second shaft 16 by removing the external thread 40 of the ball 7 from the threaded hole 42 of the second shaft 16 .

In the embodiment shown in FIG. 5, the second thrust member 5 consists of a single annular member and does not have two semi-annular members. Furthermore, the latch 27 shown in FIG. 1 is also not provided.

An embodiment of a method for assembling the joint device 1 according to the embodiment shown in FIG. 5 will be described. First, the first shaft 15, the first thrust member 3, and the second thrust member 5 are removed from the housing 11, and the spherical body 7 is removed from the second shaft 16. Then, the second thrust member 5 and the spherical body 7 are removed. It is put in the internal space 10 of the housing 11 . Next, with the second thrust member 5 positioned between the sphere 7 and the second shaft 16, the external thread 40 of the sphere 7 is screwed into the screw hole 42 of the second shaft 16, and the sphere 7 is screwed onto the second shaft 16. fixed. The first thrust member 3 is put into the internal space 10 through the opening 11 b of the housing 11 or the screw hole 19 and placed on the sphere 7 . Further, the entire housing 11 is rotated around its central axis CL, and the threaded hole 19 of the housing 11 is moved toward the first shaft until the first flat surface 3b of the first thrust member 3 contacts the end surface of the first shaft 15. 15 is screwed into the male screw portion 20 . With the first flat surface 3b of the first thrust member 3 in contact with the end surface of the first shaft 15, the anti-rotation screw 35 is screwed into the second screw hole 11c formed in the side wall of the housing 11, so that the housing 11 and the first shaft 15 are connected. The relative position with the axis 15 is fixed. This completes the assembly of the joint device 1 .

When replacing the first thrust member 3 and/or the second thrust member 5 , first, the entire housing 11 is rotated in the opposite direction to separate the housing 11 from the first shaft 15 . The first thrust member 3 can be taken out from the opening 11 b of the housing 11 or the threaded hole 19 . When removing the second thrust member 5 , the external thread 40 of the ball 7 is removed from the screw hole 42 of the second shaft 16 and the ball 7 is separated from the second shaft 16 . Then, the ball 7 is removed from the housing 11 and the second thrust member 5 is removed from the housing 11 .

Each embodiment of the coupling device 1 described above connects a reciprocating pump for transferring liquefied gas such as liquid hydrogen, liquefied natural gas, liquefied ammonia, liquid nitrogen, liquefied ethylene gas, liquefied petroleum gas, and a drive source. suitable for the application. In particular, as shown in FIG. 4, the joint device 1 is arranged between the drive source 31 and the reciprocating pump 32, so that the cryogenic liquefied gas in the reciprocating pump 32 cools (freezes) the drive source 31. You can prevent it from happening.

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.

1 joint device 3 first thrust member 3a first concave surface 3b first flat surface 5 second thrust member 5a second concave surface 5b second flat surface 7 sphere 7a outer surface 10 internal space 11 housing 11a through hole 11b opening 11c second screw Hole 15 First shaft 16 Second shaft 19 Screw hole 20 Male threaded portion 24 Seat 27 Latch 31 Drive source 32 Reciprocating pump 35 Anti-rotation screw 40 Male screw 42 Screw hole

Claims (8)

A coupling device for connecting a drive source and a reciprocating pump,
a first thrust member having a first concave surface;
a second thrust member having a second concave surface;
a sphere sandwiched between the first concave surface and the second concave surface;
a housing having an internal space that accommodates the first thrust member, the second thrust member, and the sphere;
The first thrust member and the second thrust member are arranged along the central axis of the housing,
The joint device, wherein the width of the internal space is greater than the widths of the first thrust member, the second thrust member, and the sphere. 2. The coupling device of claim 1, wherein the first concave surface and the second concave surface are concave spherical surfaces having the same radius of curvature as the outer surface of the sphere. 3. The joint device according to claim 1, wherein said first thrust member, said second thrust member, and said spherical body are eccentric with respect to the central axis of said housing. 4. Any one of claims 1 to 3, wherein the second thrust member has a second planar surface and the housing has a planar seat in surface contact with the second planar surface. fitting device. the housing is fixed to a first shaft extending from one of the drive source and the reciprocating pump;
5. The coupling device according to any one of claims 1 to 4, wherein said ball is fixed to a second shaft extending from the other of said drive source and said reciprocating pump. The housing has a screw hole communicating with the internal space,
6. The joint device according to claim 5, wherein a male threaded portion formed on the outer peripheral surface of said first shaft is screwed into said threaded hole. 7. The joint arrangement of claim 6, wherein said first thrust member has a first planar surface, said first planar surface contacting an end surface of said first shaft. The joint device according to any one of claims 1 to 7, wherein the second thrust member has a structure divided into a plurality of members.

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