JP2008069896A - Eccentric joint and pump device equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eccentric joint having reduced size and weight while coping with relatively greater compressive force and tensile force. <P>SOLUTION: The eccentric joint 16 comprises a driving side rotary part 30, a driven side part 28, and an intermediate part 31 connecting the driving side part 30 to the driven side part 28 for transmitting the rotation of the driving side part 30 to the driven side part 28. A first connection structure 40 between the driving side part 30 and the intermediate part 31 and a second connection structure 41 between the driven side part 28 and the intermediate part 31 each have a plurality of connection hole portions 35 provided in the intermediate part 31, and connection shaft portions 33, 33 provided on the driving side part 30 and the driven side part 28, respectively, for inserting themselves through the corresponding connection hole portions 35 slidably in the axial direction and slidably on the axes thereof. The connection shaft portion 33 of the first connection structure 40 is approximately perpendicular to the connection shaft portion 33 of the second connection structure 41. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides, for example, an eccentric joint capable of transmitting the rotation of the driving side portion to the driven side portion even when the rotation centers of the driving side portion and the driven side portion are different and eccentric, and a pump including the same Relates to the device.

  An example of a pump device including a conventional eccentric joint will be described with reference to FIGS. 11 and 12 (see, for example, Patent Document 1). As shown in FIG. 1, the pump device 1 includes a uniaxial eccentric screw pump 2, and the uniaxial eccentric screw pump 2 includes a rotor 3 and a stator 4. The rotor 3 has a male screw shape, and is fitted into the stator 4 having a female screw-shaped inner hole 4a. One end of the rotor 3 is connected to a drive shaft 6 via an Oldham type eccentric joint 5, and the drive shaft 6 is rotatably held by a pump casing 8 via a shaft seal 7. Further, the rear end portion of the drive shaft 6 is connected to the output shaft 10 via a coupling sleeve 9. The output shaft 10 is rotationally driven by an electric motor 11 with a speed reducer.

  According to the pump device 1 shown in FIG. 11, when the electric motor 11 is rotationally driven, the rotation of the electric motor 11 is caused by the rotor of the uniaxial eccentric screw pump 2 via the output shaft 10, the drive shaft 6, and the eccentric joint 5. 3, the rotor 3 can be rotated.

  At this time, the rotor 3 revolves around the central axis of the stator 4 while rotating. The reason why the rotor 3 revolves around the central axis of the stator 4 while rotating is based on the fact that the inner hole 4a of the stator 4 is formed in a female screw shape and the rotor 3 is formed in a male screw shape. Is. Since the revolution movement of the rotor 3 can be permitted by the Oldham type eccentric joint 5, the rotation of the drive shaft 6 is reliably transmitted to the rotor 3.

  As shown in FIG. 12, the Oldham type eccentric joint 5 includes a driven side portion 12, an intermediate portion 13, and a driving side portion 14. The driven side portion 12 is provided with an engaging ridge 12a, and this engaging ridge 12a is engaged with an engaging groove 13a formed in the intermediate portion 13. The engagement protrusion 12a is slidable in the length direction of the engagement groove 13a. And since the front-end | tip part of the engagement protrusion 12a is formed as the enormous part 12b, even when the force of the direction which separates the driven side part 12 and the intermediate part 13 act | operates, both will not be pulled apart. ing.

In addition, since the connection structure of the drive side part 14 and the intermediate part 13 is equivalent to the connection structure of the driven side part 12 and the intermediate part 13, the description is abbreviate | omitted. The engaging grooves 13a and 13a formed on the left and right side surfaces of the intermediate portion 13 are substantially orthogonal to each other.
JP 2004-360469 A

  However, in the conventional Oldham type eccentric joint 5 shown in FIG. 12, when a pulling force is applied to both the left and right sides in FIG. Therefore, it is difficult to allow a relatively large pulling force. This is because if the eccentric joint 5 is enlarged in order to increase the pulling force, the bulk of the pump device 1 is increased, and if a material having a high strength is used, it becomes expensive and the weight may be increased. .

  The tensile force or the compressive force acts on the eccentric joint 5 when, for example, the rotor 3 is rotated in the forward rotation direction and the reverse rotation direction. In addition to rotating the rotor 3 in the forward rotation direction, there are a case where the rotor 3 is rotated in the reverse rotation direction, for example, a case where an operation of cleaning the liquid by flowing it back is performed, and a case where the liquid transfer direction is changed.

  And in the conventional Oldham type eccentric joint 5 shown in FIG. 12, since the shape of the engagement protrusion 12a which has the enormous part 12b, and the engagement groove 13a which this engagement protrusion 12a engages is complicated, these Is difficult to process accurately, resulting in increased manufacturing costs and longer delivery times.

  Further, in order to extend the life of the Oldham type eccentric joint 5, it is necessary to increase the strength of the material and finish the sliding portion with appropriate dimensional accuracy. However, as described above, since it is difficult to process the engagement protrusion 12a and the engagement groove 13a with appropriate accuracy, it is difficult to satisfy both of these requirements, and as a result, a relatively short lifetime. End up.

  Further, when the pump device 1 is used to transport a corrosive liquid or a liquid with low lubricity, the eccentric joint 5 is formed of a material that can handle them, or the surface of the sliding portion is attached to them. It is necessary to perform processing and processing so as to be able to cope with it. However, if the eccentric joint 5 is formed of such a material, or if processing or processing is performed, workability such as cutting is deteriorated, or depending on the processing, deformation or cracking occurs. May occur. In addition, as described above, it is very difficult to satisfy these requirements because it is difficult to process the engaging protrusions 12a and the engaging grooves 13a with appropriate accuracy. The eccentric joint 5 may not be used when transferring a liquid having low lubricity or liquid having low lubricity.

  And in this Oldham type eccentric joint 5, since the engaging protrusion 12a is a structure fitted to the engaging groove 13a, the center axis | shaft of the rotor 3 and the center axis | shaft of the drive shaft 6 cross | intersect a plane mutually, for example When the rotor 3 and the drive shaft 6 rotate in a three-dimensionally intersecting state, the outer surface of the engaging protrusion 12a slides in a state where it contacts the inner surface of the engaging groove 13a, and there is uneven wear on each outer surface and inner surface. It can happen. When uneven wear occurs in this way, the life of the eccentric joint 5 is shortened. In order to prevent such contact, it is conceivable to increase the gap between the base end of the engaging protrusion 12a and the opening edge of the engaging groove 13a shown in FIG. Then, since the strength of the engaging protrusion 12a is lowered, there is a certain limit in preventing the contact with one piece.

  Further, when the Oldham type eccentric joint 5 rotates, the engaging ridge 12a slides back and forth along the engaging groove 13a, and this sliding causes the outer surface of the engaging ridge 12a and the inner surface of the engaging groove 13a. Both wear out. Thus, when both the engaging protrusion 12a and the engaging groove 13a are worn and cannot be used, the rotor 3 provided with the engaging protrusion 12a (the driven side portion 12 and the driving side portion 14) and It is necessary to replace the drive shaft 6 and the intermediate portion 13 provided with the engagement groove 13a. Therefore, the cost of consumable parts increases.

  The present invention has been made to solve the above-described problems, and is an eccentric joint capable of reducing the bulk and weight and allowing a relatively large compressive force and tensile force. And it aims at providing a pump apparatus provided with this.

  The eccentric joint according to the invention of claim 1 connects the drive side portion to be rotationally driven, the driven side portion on the driven side, the drive side portion and the driven side portion, and rotates the drive side portion. In an eccentric joint comprising an intermediate part for transmitting to the driven side part, the first connecting structure of the driving side part and the intermediate part and the second connecting structure of the driven side part and the intermediate part are mutually A connecting hole provided in any one of the connecting holes, and a connecting shaft that is slidably inserted in the axial direction with respect to the connecting hole; the connecting shaft of the first connecting structure; The connecting shaft portion of the second connecting structure is three-dimensionally crossed with each other.

  According to the eccentric joint according to the first aspect of the present invention, the connecting shaft portions of the first and second connecting structures are slidable in the axial direction relative to the connecting hole portion, and the first connecting As the connecting shaft portion of the structure and the connecting shaft portion of the second connecting structure are three-dimensionally crossed with each other, the center of rotation of the driving side portion and the center of rotation of the driven side portion are different and eccentric. Even in this case, the rotation of the driving side portion can be transmitted to the driven side portion via the intermediate portion. Since each of the first and second connection structures has a structure in which the connection shaft portion is inserted through the connection hole portion, when a tensile force and a compression force are applied to these connection structures, these forces are applied. Can be received as a force by which the outer peripheral surface of the connecting shaft portion and the inner peripheral surface of the connecting hole portion are pressed against each other. Therefore, a relatively large pulling force and compressive force can be allowed.

  As a case where a relatively large tensile force and compressive force are applied to the eccentric joint, for example, when the eccentric joint is used as a joint for connecting the rotor of the pump device and the rotary drive shaft, the forward rotation and the reverse rotation are performed. Thrust loads may act on the rotor in both directions. Further, when this eccentric joint is used as a shaft joint, a thrust load may act on the connected shaft in both directions.

  An eccentric joint according to a second aspect of the present invention is the eccentric joint according to the first aspect, wherein the connecting shaft portion of the first connecting structure and the connecting shaft portion of the second connecting structure are substantially orthogonal to each other.

  According to the eccentric joint according to the second aspect of the present invention, since the connecting shaft portion of the first connecting structure and the connecting shaft portion of the second connecting structure are substantially orthogonal to each other, the amount of movement of the intermediate portion during rotation varies. And the sliding distance can be shortened. Thereby, the rotation of the driving side portion can be stably transmitted to the driven side portion.

  The eccentric joint according to a third aspect of the present invention is the eccentric joint according to the first or second aspect, wherein both or one of the connection shaft portions of the first and second connection structures is a connection hole portion centering on the shaft center. It is inserted in such a way that it can swing freely.

  According to the eccentric joint of the invention of claim 3, when the driving side portion and the driven side portion rotate in a state where the central axis of the driving side portion and the central axis of the driven side portion intersect each other in a plane or three-dimensionally cross In addition, the connecting shaft portions of the first and second connecting structures can swing with respect to the connecting hole portion around the axis. Therefore, even if the center axis of the driving side portion and the center axis of the driven side portion rotate in a state where they intersect with each other, the outer surface of the connecting shaft portion is less likely to come into contact with the inner surface of the connecting hole portion. It is possible to prevent uneven wear from occurring on the outer surface and the inner surface. Thus, eccentric wear can be prevented, and an eccentric joint with a relatively long life can be provided.

  The eccentric joint according to a fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein each of the connecting shaft portion and the connecting hole portion in contact with each other has a substantially short cylindrical shape. Is.

  According to the eccentric joint according to the invention of claim 4, since the shapes of the respective portions of the connecting shaft portion and the connecting hole portion that contact each other are substantially short cylindrical shapes, the connecting shaft portion and the connecting hole portion can be easily and accurately Can be formed. As a result, even when surface hardening or the like is performed on the outer peripheral surface of the connecting shaft portion or the inner peripheral surface of the connecting hole portion that are in contact with each other, it is easy to accurately form the surface subjected to the processing. Become. For example, when a sleeve is attached to the contact portion and used, the sleeve can be formed into a substantially short cylindrical shape, and the substantially short cylindrical sleeve can be manufactured relatively easily. Manufacturing using a relatively difficult wear-resistant material or corrosion-resistant material can also be performed relatively easily.

  An eccentric joint according to a fifth aspect of the present invention provides the eccentric joint according to any one of the first to fourth aspects, wherein one or both of the connecting shaft portion and the connecting hole portion are in contact with each other. A sleeve formed of a wearable material or a corrosion-resistant material is provided.

  According to the eccentric joint according to the invention of claim 5, by providing a sleeve made of a wear-resistant material or a corrosion-resistant material at one of the sliding portions of the connecting shaft portion and the connecting hole portion that are in contact with each other, It is a member on the side where the sleeve is provided, and wear or corrosion of the sliding portion can be reduced or prevented. The member on the side where the sleeve is not provided can be specified as a consumable part, and the cost of the consumable part can be reduced by reducing the size of the member used as the consumable part. In particular, if the connecting shaft portion is specified as a consumable part, the cost of the consumable part can be greatly reduced. Further, by providing sleeves in both the connecting shaft portion and the connecting hole portion, it is possible to reduce or prevent wear or corrosion of the sliding portion on either side. Then, by assuming that one sleeve has better wear resistance than the other sleeve, the other sleeve can be specified as a consumable part.

  An eccentric joint according to a sixth aspect of the present invention is the eccentric joint according to any one of the first to fourth aspects, wherein either one of the connecting shaft portion and the connecting hole portion in contact with each other is made of a synthetic resin. A sleeve is provided.

  According to the eccentric joint according to the invention of claim 6, by providing a sleeve made of synthetic resin in one of the portions of the connecting shaft portion and the connecting hole portion that are in contact with each other, the sliding of both at the contact portion is achieved. It can be done smoothly. If the synthetic resin sleeve is worn by the sliding, the synthetic resin sleeve can be specified as a consumable part, and the cost of the consumable part can be reduced.

  An eccentric joint according to a seventh aspect of the present invention is the eccentric joint according to any one of the first to fourth aspects, wherein the intermediate portion is formed of a synthetic resin.

  According to the eccentric joint according to the seventh aspect of the invention, since the intermediate part is made of synthetic resin, the intermediate part can be manufactured relatively easily and the weight of the eccentric joint can be reduced. And the intermediate part with comparatively small intensity | strength can be specified as a consumable part, and the cost of a consumable part can be reduced.

  An eccentric joint according to an invention of claim 8 is the eccentric joint according to any one of claims 1 to 7, wherein the intermediate hole is provided with the connecting hole and a preliminary connecting hole equivalent to the connecting hole. It is.

  The preliminary connection hole portion of the eccentric joint according to the invention of claim 8 is used when the other connection hole portion cannot be used, for example, due to wear, thereby continuing the intermediate portion provided with the preliminary connection hole portion. Can be used. As a result, it is possible to extend the life and save resources of the intermediate portion provided with the preliminary connection hole.

  The eccentric joint according to a ninth aspect of the present invention is the eccentric joint according to any one of the first to eighth aspects, wherein the connecting shaft portion opens outwardly at one or both ends and the central side portion. And the openings communicate with each other through the communication holes.

  According to the eccentric joint according to the invention of claim 9, since the connecting shaft portion extends in the radial direction of the rotation of the eccentric joint, when the connecting shaft portion is rotated by the rotation of the eccentric joint, the fluid in the communication hole is It can be forced to flow out from the opening formed at the end of the connecting shaft by centrifugal force. And a fluid can be made to flow in in a communicating hole from the opening formed in the center side part of a connecting shaft part. Thereby, the connecting shaft portion can exhibit a function of stirring the liquid in which the eccentric joint is immersed.

  An eccentric joint according to the invention of claim 10 is the invention according to any one of claims 1 to 9, wherein the intermediate portion is formed of a substantially short cylindrical member.

  According to the eccentric joint according to the invention of claim 10, by making the intermediate portion a substantially short cylindrical member, the intermediate portion can be lightened and can be manufactured relatively easily and accurately.

  A pump device according to an eleventh aspect of the present invention includes the eccentric joint according to any one of the first to tenth aspects, and a uniaxial eccentric screw pump that is rotationally driven by power transmitted by the eccentric joint, and the uniaxial eccentricity. The screw pump has a male screw type rotor coupled to the driven side portion and a female screw type stator into which the male screw type rotor is fitted.

  According to the pump device of the eleventh aspect of the present invention, when the driven side portion is driven by the driving side portion to rotate forward or reverse, the rotor of the uniaxial eccentric screw pump rotates forward or reversely, and the fluid is opened in one or the other. The air can be sucked from the portion and discharged from the other or one opening. When the rotor rotates, the end connected to the driven side of the rotor revolves around the central axis of the female screw type stator while rotating, but as described above, the driven side connected to the rotor is And since it is the structure which can revolve while revolving with the revolution movement of the edge part of a rotor, the rotational force from a drive side part can be transmitted to a rotor.

  The eccentric joint according to a twelfth aspect of the present invention is the eccentric joint according to the eleventh aspect, wherein the male screw type rotor is made of metal, and the female screw type stator is made of a synthetic resin, and is in contact with the male screw type rotor. The outer peripheral surface is opened so that the outer peripheral surface can be deformed by pressure.

  According to the pump device of the twelfth aspect of the present invention, when the rotor rotates, the driven side portion coupled to the end portion of the rotor revolves around the central axis of the female screw type stator while rotating. Since the outer surface of the mold stator can be deformed by contact pressure with the rotor, the amount of eccentricity between the center of the driven side portion and the center of the drive side portion can be kept small. Accordingly, the rotation of the driving side can be smoothly transmitted to the rotor via the driven side, and as a result, the rotor can be smoothly rotated.

  An eccentric joint according to a thirteenth aspect of the present invention is the eccentric joint according to the twelfth aspect of the present invention, wherein the female threaded stator has an end on the eccentric joint side or an end opposite to the side on which the eccentric joint is disposed. The casing is cantilevered.

  According to the pump device of the thirteenth aspect of the invention, since the female thread type stator is cantilevered, the free end side portion of the stator can be deformed mainly by the cantilever bending direction by the rotation of the rotor. Therefore, the amount of eccentricity between the center of the driven side portion and the center of the driving side portion can be further reduced. As a result, the rotor can be rotated extremely smoothly.

  According to the eccentric joint according to the present invention, each of the first and second connecting structures is configured such that the connecting shaft portion is inserted into the connecting hole portion, and a relatively large tensile force and compressive force can be allowed. Even when the joint is made relatively small or formed using a material having low strength, it is possible to ensure a relatively large tensile force and compressive force. Therefore, a relatively large tensile force and compressive force can be allowed, and a lightweight eccentric joint can be provided.

  Since each of the first and second connection structures has a simple configuration in which the connection shaft portion is inserted into the connection hole portion, the first connection structure and the second connection structure can be easily processed with high accuracy, thereby reducing the manufacturing cost. Can be manufactured with a short delivery time.

  Further, according to the eccentric joint of the present invention, since it can be processed easily with high accuracy, the condition of using a material having a high strength and finishing the sliding portion with an appropriate dimensional accuracy can be achieved more easily than before. Can do. Therefore, an eccentric joint having a relatively long life can be provided at a low cost.

  Furthermore, when this eccentric joint is used for applications where corrosive fluids or fluids with low lubricity are in contact, this eccentric joint is formed of a material that can handle them, or the surface of the sliding part is attached to them. It is necessary to perform processing and processing to be able to cope with this, but since this eccentric joint is easy to process with high accuracy, it is difficult to perform such processing. Corrosion-resistant material and self-lubricating material (synthetic (Including resin material) or appropriate treatment. As a result, this eccentric joint can also be used when transferring a corrosive fluid or a fluid with low lubricity.

  According to the pump device of the present invention, since the eccentric joint that can accept a relatively large tensile force and compressive force is provided, the rotor is driven to rotate in both forward and reverse directions, that is, the rotor is thrust in both directions. It can be used for applications where a load is applied. Further, since the rotor can be used by rotating it in a desired direction, for example, when installing a pump device, it is not necessary to determine the rotation direction of the rotor in advance, and the degree of freedom in design can be increased. .

  Hereinafter, a first embodiment of an eccentric joint according to the present invention and a pump device including the same will be described with reference to FIGS. As shown in FIG. 1, the eccentric joint 16 of this embodiment is eccentric even if the center of the drive shaft 18 rotationally driven by the drive unit 17 and the center of the rotor 20 of the uniaxial eccentric screw pump 19 are different. The rotation of the drive shaft 18 can be transmitted to the rotor 20. The pump device 21 including the eccentric joint 16 includes a uniaxial eccentric screw pump 19, an eccentric joint 16, a magnet type coupling portion 22, and a driving portion 17.

  The uniaxial eccentric screw pump 19 is a rotary positive displacement pump, and includes a stator 23 and a rotor 20 as shown in FIG. The stator 23 is formed in a cylindrical shape having a female screw-shaped inner hole 23a, and the inner hole 23a has an elliptical cross-sectional shape, and is formed of, for example, synthetic rubber or synthetic resin. As shown in FIG. 1, the stator 23 has an end stud 24 attached to the left end portion and a casing 25 attached to the right rear end portion. The first opening 26 formed in the end stud 24 can be used as, for example, a discharge port and a suction port, and the second opening 27 formed in the casing 25 is used as, for example, a suction port and a discharge port. be able to.

  As shown in FIG. 1, the rotor 20 is formed in a male screw shape, has a vertical cross-sectional shape that is substantially a perfect circle, and the helical pitch is set to about ½ of the pitch of the stator 23. The rotor 20 is made of metal such as stainless steel, for example, and is rotatably inserted into the inner hole 23a of the stator 23. The rear end portion of the rotor 20 is coupled to the driven side portion 28 that constitutes the eccentric joint 16.

  When the rotor 20 rotates, the driven side portion 28 coupled to the rear end portion of the rotor 20 rotates around the central axis line 29 of the stator 23 (which coincides with the central axis line of the driving side portion 30). Move around. As described above, the driven side portion 28 coupled to the rear end portion of the rotor 20 revolves around the central axis 29 of the stator 23 while rotating. The inner hole 23a of the stator 23 is formed in a female screw shape. This is based on the fact that 20 is formed in a male screw shape. When the rotor 20 rotates, each portion in the length direction of the rotor 20 is in a radial direction orthogonal to the central axis of the rotor 20, that is, the length direction of the ellipse of the inner hole 23a formed in the stator 23. Reciprocate along.

  As shown in FIGS. 1 and 2, the eccentric joint 16 is for transmitting the rotation of the drive shaft 18 to the rotor 20, and includes a driven side portion 28, a drive side portion 30, and an intermediate portion 31. . FIG. 2A is an exploded perspective view schematically illustrating the eccentric joint 16, and FIG. 2B is a perspective view schematically illustrating the eccentric joint 16.

  As shown in FIGS. 1 and 2, the driven side portion 28 includes a driven side main body 32 and a connecting shaft portion 33. The driven side main body 32 is formed in a substantially short cylindrical shape and is coupled to the rear end portion of the rotor 20. The driven side main body 32 is formed with a coupling hole 32a orthogonal to the central axis, and the coupling shaft portion 33 is inserted into and fixed to the coupling hole 32a. The connecting shaft portion 33 has a short cylindrical shape with a predetermined length, and both end portions protrude from the side surface of the driven side main body 32 with substantially the same length.

  As shown in FIGS. 1 and 2, the drive side portion 30 is equivalent to the driven side portion 28, and includes a drive side main body 34 and a connecting shaft portion 33. The drive side main body 34 is formed in a substantially short cylindrical shape, and is coupled to the distal end portion of the drive shaft 18. Then, similarly to the driven side main body 32, the connecting shaft portion 33 is inserted and fixed to the driving side main body 34. The connecting shaft portion 33 has a short cylindrical shape with a predetermined length, and both end portions protrude from the side surface of the drive side main body 34 with substantially the same length.

  As shown in FIGS. 1 and 2, the intermediate portion 31 is formed in a substantially short cylindrical shape, and the inner diameter thereof is larger than the outer diameters of the driven side main body 32 and the driving side main body 34. The intermediate portion 31 is provided with two connection holes 35 and 35 at positions where one opening end portion thereof faces each other. Both end portions of the connecting shaft portion 33 provided on the driven side portion 28 are inserted into the two connecting hole portions 35 and 35. As shown in FIG. 2 (b), the connecting shaft portion 33 is slidable with respect to the connecting hole portions 35 and 35 in the axial direction, and as shown in FIG. The connecting holes 35 and 35 are swingable.

  And as shown in FIG.1 and FIG.2, the intermediate part 31 is provided in the other opening end part in the position where the connection hole parts 35 and 35 mutually oppose. Both end portions of the connecting shaft portion 33 provided in the driving side portion 30 are inserted into the two connecting hole portions 35 and 35. As shown in FIG. 2 (b), the connecting shaft portion 33 is slidable with respect to the connecting hole portions 35 and 35 in the axial direction, and is connected to the connecting hole portions 35 and 35 around the axis. It can swing freely. However, the two connecting shaft portions 33, 33 inserted through the respective connecting hole portions (35, 35), (35, 35) are provided with the connecting hole portions 35,... So as to be substantially orthogonal to each other. Yes.

  Further, as shown in FIGS. 4A and 4B, the connecting shaft portions 33 and 33 are formed so that both end portions are narrower than the central portion, and sleeves 36 and 36 are attached to the respective end portions. . That is, the sleeve 36 has an outer peripheral surface that is slidable in the axial direction with respect to the connecting hole portion 35 and is formed so as to be swingable about the axis. The sleeve 36 is attached to the end of the connecting shaft 33 by being bonded with an adhesive 37. In order to prevent the adhesive 37 from eluting, both sides of the portion where the adhesive 37 is applied are sealed with two annular seals 38, 38. Each annular seal 38 is attached to each annular groove 39 formed on the outer peripheral surface of the end portion of the connecting shaft portion 33.

  The connecting hole portions 35 and 35 connecting the driving side portion 30 and the intermediate portion 31 and the connecting shaft portion 33 inserted through the connecting hole portions 35 and 35 are the first connecting structure 40. The connection hole portions 35, 35 connecting the driven side portion 28 and the intermediate portion 31, and the connection shaft portion 33 inserted through the connection hole portions 35, 35 are the second connection structure 41.

  The material of the driven side main body 32 and the drive side main body 34 is, for example, a metal such as stainless steel, titanium, or a titanium alloy, and the material of the connecting shaft portion 33 is, for example, a metal. The material of the sleeve 36 has, for example, wear resistance or corrosion resistance, and is ceramic or the like. The material of the intermediate portion 31 is a synthetic resin such as polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE).

  As shown in FIG. 1, the magnet-type connecting portion 22 is for transmitting the rotation of the output shaft 17 a of the driving portion 17 to the driving shaft 18. The driven-side magnet portion 42 and the driving-side magnet portion 43 are connected to each other. I have. The driven magnet portion 42 is a short cylindrical body and is screwed to the rear end portion of the drive shaft 18. The drive shaft 18 is rotatably held by a bearing housing 45 via an inner bearing 44. An outer bearing 46 is interposed between the inner peripheral surface of the driven magnet portion 42 and the outer peripheral surface of the bearing housing 45. The driven-side magnet portion 42 is accommodated in a space formed by the partition can 47 and the bearing housing 45. The partition can 47 and the bearing housing 45 are attached to the coupling housing 48 and the casing 25.

  Further, the drive side magnet unit 43 is disposed outside the partition can 47. The drive-side magnet unit 43 is a short cylindrical body, and has an output shaft 17a coupled thereto. The output shaft 17a is rotationally driven by the drive unit 17. The drive unit 17 is, for example, an electric motor with a speed reducer. The output shaft 17 a, the drive shaft 18, and the stator 23 are provided so that their central axes coincide with each other and are on the central axis 29.

  The magnet-type connecting portion 22 shown in FIG. 1 can transmit the rotation of the driving side magnet portion 43 to the driven side magnet portion 42 using the attractive force and the repulsive force between the magnetic poles.

  According to the pump device 21 shown in FIG. 1 configured as described above, when the drive unit 17 is rotationally driven in the forward rotation direction or the reverse rotation direction, the rotation of the drive unit 17 is changed to the output shaft 17a, the drive shaft 18, and It is transmitted to the rotor 20 of the uniaxial eccentric screw pump 19 through the eccentric joint 16, and this rotor 20 can be rotated in the forward rotation direction or the reverse rotation direction. When the rotor 20 rotates forward or backward, fluid (for example, liquid) is sucked from the second opening 27 or the first opening 26, and the sucked fluid is discharged from the first opening 26 or the second opening 27. can do.

  At this time, the rotor 20 revolves around the central axis of the stator 23 while rotating. The reason why the rotor 20 revolves around the central axis of the stator 23 while rotating is based on the fact that the inner hole 23a of the stator 23 is formed in a female screw shape and the rotor 20 is formed in a male screw shape. Is. The revolution movement of the rotor 20 can be permitted by the eccentric joint 16, so that the rotation of the drive shaft 18 is reliably transmitted to the rotor 20.

  Thus, the eccentric joint 16 can transmit the rotation of the drive shaft 18 to the revolving-moving rotor 20 as shown in FIGS. 2 (a) and 2 (b). Each of the connecting shaft portions 33 and 33 of 40 and 41 is slidable in the axial direction relative to the connecting hole portions (35 and 35) and (35 and 35). This is because the connecting shaft portion 33 of the second connecting structure 41 and the connecting shaft portion 33 of the second connecting structure 41 are three-dimensionally crossed each other, whereby the center of rotation of the driving side portion 30 and the rotation of the driven side portion 28 are obtained. Even when the center of the shaft is misaligned and eccentric, the rotation of the driving side portion 30 can be transmitted to the driven side portion 28 via the intermediate portion 31.

  As shown in FIGS. 1 and 2, each of the first and second connection structures 40 and 41 has a structure in which the connection shaft portion 33 is inserted into the connection hole portions 35 and 35. When a pulling force and a compressive force are applied to 40 and 41, these forces are used as forces for pressing the outer peripheral surfaces of the connecting shaft portions 33 and 33 against the inner peripheral surfaces of the connecting hole portions 35 and so on. Can receive. Therefore, a relatively large pulling force and compressive force can be allowed.

  The case where a relatively large tensile force and compressive force are applied to the eccentric joint 16 is, for example, a case where a thrust load is applied to the rotor 20 in both directions when the rotor 20 rotates forward and reverse.

  Moreover, according to the eccentric joint 16 shown in FIG.1 and FIG.2, each 1st and 2nd connection structure 40 and 41 is the structure by which the connection shaft part 33 penetrates the connection hole parts 35 and 35, and is comparatively Since a large tensile force and compressive force can be tolerated, a relatively large tensile force and compressive force can be secured even if the eccentric joint 16 is made relatively small or formed using a material having low strength. Can do. Accordingly, it is possible to provide the eccentric joint 16 that can accept a relatively large tensile force and compressive force and is lightweight.

  Since each of the first and second connection structures 40 and 41 has a simple configuration in which the connection shaft portion 33 is inserted into the connection hole portions 35 and 35, it can be easily processed with high accuracy. The manufacturing cost can be kept low, and it can be manufactured with a short delivery time.

  Further, according to this eccentric joint 16, since it can be processed easily with high accuracy, it is possible to easily achieve the conditions of using a material having a high strength and finishing the sliding portion with appropriate dimensional accuracy. it can. Therefore, the eccentric joint 16 having a relatively long life can be provided at a low cost.

  Furthermore, when this eccentric joint 16 is used for an application in which a corrosive fluid or a fluid having low lubricity contacts, the eccentric joint 16 is formed of a material that can handle them, or the surface of the sliding portion is formed. Although it is necessary to perform processing and processing so as to be able to cope with them, the eccentric joint 16 is easy to process with high accuracy, and therefore is formed of a corrosion-resistant material or an oil-free material which is difficult to perform such processing. Or appropriate processing can be performed. As a result, the eccentric joint 16 can also be used when transferring a corrosive fluid or a fluid having low lubricity.

  According to this pump device 21, the rotor 20 can be used by rotating it in the desired forward direction and reverse direction. Therefore, by rotating the rotor 20 in the reverse direction, for example, the inside of the pump device 21 can be effectively used. Can be washed. Then, the direction of fluid transfer can be changed by reverse operation. Furthermore, when the pump device 21 is installed, it is not necessary to determine the rotation direction of the rotor 20 in advance, so that the degree of freedom in design can be increased.

  Further, as shown in FIGS. 2A and 2B, according to the eccentric joint 16, the connecting shaft portion 33 of the first connecting structure 40 and the connecting shaft portion 33 of the second connecting structure 41 are orthogonal to each other. Since they are substantially orthogonal, fluctuations in the amount of movement of the intermediate portion 31 during rotation can be reduced. Thereby, the rotation of the driving side portion 30 can be stably transmitted to the driven side portion 28.

  Further, as shown in FIG. 3, according to the eccentric joint 16, the center axis 29 of the driving side portion 30 and the center axis 49 of the driven side portion 28 are planarly or three-dimensionally crossed (intersection angle θ). When the drive side portion 30 and the driven side portion 28 are rotated, the connection shaft portions 33, 33 of the first and second connection structures 40, 41 are in relation to the connection hole portion 35 around the axis. Can swing. Therefore, even if the central axis 29 of the driving side portion 30 and the central axis 49 of the driven side portion 28 rotate in a state of crossing each other, the outer surfaces of the connecting shaft portions 33, 33 are connected to the connecting hole portions 35,. There is little contact with the inner surface, and uneven wear can be prevented from occurring on each outer surface and inner surface. Thus, the eccentric wear can be prevented, so that the eccentric joint 16 having a relatively long life can be provided.

  As shown in FIGS. 2 and 4, according to the eccentric joint 16, the shapes of the outer peripheral surface and the inner peripheral surface of the connecting shaft portion 33 and the connecting hole portion 35 that are in contact with each other are substantially short cylindrical shapes. The connecting shaft portion 33 and the connecting hole portion 35 can be easily formed with high accuracy. For example, when the sleeve 36 is used in the contact portion, the shape of the sleeve 36 can be made into a substantially short cylindrical shape, and the substantially short cylindrical sleeve 36 can be manufactured relatively easily. For example, it is possible to relatively easily manufacture using a wear-resistant material or a corrosion-resistant material that is relatively difficult to process.

  4 (a) and 4 (b), according to the eccentric joint 16, both the connecting shaft portions 33 of the connecting shaft portion 33 and the connecting hole portion 35 are in contact with each other. By providing the sleeve 36 formed of wear-resistant material or corrosion-resistant material at each end, it is possible to reduce or prevent wear or corrosion of the sliding portion of the member on the side where the sleeve 36 is provided. . Thereby, the life of the connecting shaft portion 33 on the side where the sleeve 36 is provided can be extended. The intermediate part 31 on the side where the sleeve 36 is not provided can be specified as a consumable part, and the cost of the consumable part can be reduced by downsizing the intermediate part 31 used as the consumable part. .

  Furthermore, according to the eccentric joint 16 shown in FIGS. 1 and 2, since the intermediate portion 31 is made of synthetic resin, the intermediate portion 31 can be manufactured relatively easily and the weight of the eccentric joint 16 can be reduced. Can do. And the intermediate part 31 with comparatively small intensity | strength can be specified as a consumable part, and the cost of a consumable part can be reduced.

  And as shown to Fig.2 (a), (b), the intermediate part 31 can be made lightweight by using the intermediate part 31 as a short cylindrical member, and it can manufacture comparatively easily and accurately. it can.

  Next, a second embodiment of the eccentric joint according to the present invention and a pump device including the eccentric joint will be described with reference to the schematic diagrams of FIGS. The difference between the second embodiment and the first embodiment is that the eccentric joint 16 of the first embodiment has a driving side main body 34 and a driven side main body 32 as shown in FIGS. 2 (a) and 2 (b). Are provided with connecting shaft portions 33, 33, respectively, and the intermediate portion 31 is provided with connecting hole portions 35,... Through which the connecting shaft portions 33, 33 are inserted. As shown in FIGS. 5A and 5B, the eccentric joint 50 of the embodiment is provided with connection holes 35 and 35 in the driving side main body 34 and the driven side main body 32, respectively. The connection shaft portions 33 and 33 inserted through the connection hole portions 35 are fixedly provided.

  Although not shown in FIGS. 5 (a) and 5 (b), the sleeve 36 and the annular seal shown in FIGS. 4 (a) and 4 (b) are provided at the center of each of the two connecting shaft portions 33 and 33. One set equal to 38 is mounted. Then, connection holes 35 and 35 formed in the driven side and drive side main bodies 32 and 34 are slidably and swingably attached to the respective sleeves 36.

  And although not shown in a figure, it replaces with the eccentric joint 16 of 1st Embodiment, and the pump apparatus of 2nd Embodiment is provided with the eccentric joint 50 of 2nd Embodiment. Since other than this is the same as the eccentric joint 16 and the pump device 21 of the first embodiment, detailed description thereof will be omitted.

  Next, a third embodiment of an eccentric joint according to the present invention and a pump device including the same will be described with reference to the schematic diagrams of FIGS. 6 (a) and 6 (b) and FIG. The difference between the third embodiment and the first embodiment is that the eccentric joint 16 of the first embodiment includes a driven side and an intermediate portion 31 as shown in FIGS. 2 (a) and 2 (b). A total of four connecting hole portions 35,... Through which the respective connecting shaft portions 33, 33 on the drive side are inserted are provided, whereas the eccentric joint 51 of the third embodiment is shown in FIG. ), (B), the intermediate portion 31 is provided with four connecting hole portions 35,... Shown in FIGS. 2 (a), 2 (b), and a preliminary connecting hole equivalent thereto. A total of four portions 52 are provided at two open end portions of the intermediate portion 31.

  The preliminary connection hole 52 of the eccentric joint 51 according to the third embodiment shown in FIGS. 6A and 6B cannot be used due to wear of the other connection holes 35,... It is possible to continuously use the intermediate portion 31 provided with the preliminary connection hole portions 52,. Accordingly, it is possible to extend the life and save resources of the intermediate portion 31 provided with the preliminary connection hole portions 52.

  In addition, as shown to Fig.6 (a), each connection shaft part 33 and 33 can be attached to the coupling holes 32a and 32a formed in the driven side main body 32 and the drive side main body 34 so that attachment or detachment is possible. The connecting shaft portion 33 mounted in each coupling hole 32a is fixed with a set bolt 53 so that it can be done. The set bolt 53 can be inserted from each of the connecting hole portions 35 and the preliminary connecting hole portion 52 and can be screwed into a female screw portion 54 formed on the driven side main body 32 and the driving side main body 34. Further, each connecting shaft portion 33 is formed with a recess 33a to which the tip end portion of the set bolt 53 is engaged. Although not shown in FIGS. 6A and 6B, sleeves 36 are attached to both ends of each connecting shaft portion 33 as in the first embodiment.

  And as shown in FIG. 7, the pump apparatus 55 of 3rd Embodiment is provided with the eccentric joint 51 of 3rd Embodiment instead of the eccentric joint 16 of 1st Embodiment. Since other than this is the same as the eccentric joint 16 and the pump device 21 of the first embodiment, detailed description thereof will be omitted.

  Next, with reference to the schematic diagram of FIG. 8, 4th Embodiment of the eccentric joint which concerns on this invention, and a pump apparatus provided with the same is described. The difference between the fourth embodiment and the third embodiment is that the eccentric joint 51 of the third embodiment shown in FIGS. 6 (a) and 6 (b) is not shown in the drawing, but is driven and driven. The sleeves 36,... Are provided on the respective connecting shaft portions 33, 33, the connecting shaft portion 33 is a durable component, and the intermediate portion 31 is a consumable component, whereas the eccentric joint 56 of the fourth embodiment. As shown in FIG. 8, each of the eight connecting hole portions 35 and the preliminary connecting hole portion 52 provided in the intermediate portion 31 is provided with sleeves 57,. The sleeve 36 is removed from the connecting shaft portion 33, and the connecting shaft portions 33,... Are used as consumable parts. The inner peripheral surface of each sleeve 57 provided in the intermediate portion 31 is slidably and swingably attached to each outer peripheral surface at both ends of the connecting shaft portion 33.

  As described above, if the sleeves 57,... Are provided in the intermediate portion 31 and the connecting shaft portion 33 is specified as a consumable part, the cost of the consumable part can be greatly reduced.

  Although not shown in FIG. 8, the sleeve 36 and the annular seal 38 shown in FIGS. 4A and 4B are applied to the inner peripheral surfaces of the eight connecting hole portions 35 for holes. One set may be attached or the annular seal 38 may be omitted. The intermediate portion 31 may be made of metal, and each connecting shaft portion 33 may be made of synthetic resin. Further, the preliminary connecting hole 52 may be omitted.

  And although not shown in a figure, the pump apparatus of 4th Embodiment replaces with the eccentric joint 51 of 3rd Embodiment, and is provided with the eccentric joint 56 of 4th Embodiment. Since other than this is equivalent to the eccentric joint 51 and the pump device 55 of the third embodiment, detailed description thereof will be omitted.

  Next, with reference to the schematic diagram of FIG. 9, 5th Embodiment of the eccentric joint which concerns on this invention, and a pump apparatus provided with the same is described. The difference between the fifth embodiment and the third embodiment is that the eccentric joint 51 of the third embodiment shown in FIGS. 6 (a) and 6 (b) has a connecting shaft portion 33 on each of the driven side and the driving side. , 33 is not provided with a communication hole 59, whereas the eccentric joint 58 of the fifth embodiment has a communication hole 59 in each of the connecting shaft portions 33, 33 on the driven side and the drive side, as shown in FIG. Is in place.

  As shown in FIG. 9, the connecting shaft 33 on the drive side provided in the eccentric joint 58 of the fifth embodiment has openings 59a, 59a, 59b that open outwardly at both end surfaces and the central side. And these three openings 59a, 59a, 59b communicate with each other through the communication hole 59. The drive side main body 34 is also provided with an opening 34a at a position corresponding to the center side opening 59b so that the opening 59b on the center side of the connecting shaft 33 opens outward. Further, the communication hole 59 and the three openings 59a, 59a, 59b provided in the driven side connecting shaft portion 33 are the communication hole 59 and the three openings provided in the driving side connecting shaft portion 33, respectively. Since it is equivalent to the parts 59a, 59a, 59b, description thereof is omitted.

  According to the eccentric joint 58 according to the fifth embodiment shown in FIG. 9, the connecting shaft portions 33, 33 extend in the radial direction of the rotation of the eccentric joint 58. When 33 and 33 rotate, the fluid in each communicating hole 59 and 59 can be forced to flow out from the opening part 59a formed in each end surface of the connection shaft part 33 and 33 with a centrifugal force. it can. Then, the fluid can flow into the communication hole 59 from the opening 59 b formed in the central side portion of each connection shaft portion 33. Thereby, according to the pump device provided with the eccentric joint 58, for example, when transferring a liquid containing a sedimentary slurry, the liquid can be transferred while stirring, so that the slurry is mixed so as to be contained at a constant ratio. The liquid can be transferred while Thereby, it is possible to prevent the slurry from accumulating in the pump, and it is possible to remove the factor that inhibits the rotation of the pump.

  As shown in FIG. 9, in the eccentric joint 58 of the fifth embodiment, the communication holes 59 and 59 are provided for the respective connecting shaft portions 33 and 33 on the driven side and the driving side. A communication hole 59 may be provided for the connecting shaft portion 33. And although the opening parts 59a and 59a were provided in the both end surfaces of the connection shaft part 33, you may provide the opening part 59a in one end surface.

  And although not shown in a figure, the pump apparatus of 5th Embodiment replaces with the eccentric joint 51 of 3rd Embodiment, and is provided with the eccentric joint 58 of 5th Embodiment. Since other than this is equivalent to the eccentric joint 51 and the pump device 55 of the third embodiment, detailed description thereof will be omitted.

  However, in each of the above-described embodiments, as shown in FIG. 2 and the like, the driven-side connecting shaft portion 33 and the driving-side connecting shaft portion 33 are three-dimensionally crossed at right angles or substantially right angles. Instead, both of the connecting shaft portions 33 and 33 may be three-dimensionally crossed at an angle other than a right angle or a substantially right angle.

  In each of the above-described embodiments, as shown in FIG. 3, the connection shaft portions 33 and 33 on the driven side and the drive side are swingable with respect to the connection hole portions 35 and 35 around the axis. Although it was set as the structure penetrated, it replaces with this and it is good also as a structure which neither or any one of these two connection shaft parts 33 rock | fluctuate with respect to the connection hole part 35 centering on the shaft center. For example, the cross-sectional shapes of the connecting shaft portion 33, the connecting hole portion 35, and the preliminary connecting hole portion 52 may be a rectangle other than a circle, a polygon, an ellipse, or the like.

  Further, in each of the above embodiments, the material of the sleeves 36 and 57 shown in FIGS. 1, 4, 8, and the like has wear resistance or corrosion resistance, and is ceramics or the like. It may be a synthetic resin. If the sleeves 36 and 57 are made of synthetic resin, both sliding and swinging at the contact portion can be performed smoothly. Since the sleeves 36 and 57 made of synthetic resin are worn by the sliding or the like, the sleeves 36 and 57 made of synthetic resin can be specified as consumable parts, and the cost of the consumable parts can be reduced. The counterpart component that slides and swings with respect to the sleeves 36 and 57 can be used as a durable component.

  Furthermore, in each of the above embodiments, the sleeves 36 and 57 are provided. However, the sleeves 36 and 57 may not be used. That is, it is good also as a structure which the outer peripheral surface of the connection shaft part 33 and the inner peripheral surface of the connection hole part 35 contact directly. In this case, the outer peripheral surface of the connecting shaft portion 33 or the inner peripheral surface of the connecting hole portion 35 may be formed of the same material as the sleeves 36 and 57. Further, the outer peripheral surface or the inner peripheral surface may be subjected to surface hardening processing or wear resistance processing. Examples of the surface hardening treatment include heat treatment, coating, ceramicization, and work hardening.

  In the first embodiment, as shown in FIG. 1, the sleeves 36 and 36 are provided on the connecting shaft portions 33 and 33 of the first and second connecting structures 40 and 41. In addition, a sleeve may be provided in each of the connection shaft portions 33 and 33 and each of the connection hole portions 35 and 35. As described above, by providing the sleeves in both the connecting shaft portions 33 and 33 and the connecting hole portions 35 and 35, it is possible to reduce or prevent wear or corrosion of the sliding portion on either side. Then, by assuming that one sleeve has better wear resistance than the other sleeve, the other sleeve can be specified as a consumable part.

  In each of the above embodiments, the intermediate portion 31 is made of synthetic resin, but may be made of a material other than this, for example, metal. And as shown in FIG. 2 etc., although the intermediate part 31 was made into the short cylinder shape, it is good also as shapes other than this.

  Further, in each of the above embodiments, as shown in FIG. 1, the metal outer cylinder 60 is mounted on the outer peripheral surface of the synthetic resin stator 23, but the outer cylinder 60 may be omitted. . That is, the synthetic resin stator 23 may have a configuration in which the outer peripheral surface is opened so that the outer peripheral surface can project and deform by contact pressure with the metal rotor 20.

  Thus, if the outer cylinder 60 is omitted, when the rotor 20 rotates, the driven side portion 28 coupled to the end portion of the rotor 20 revolves around the central axis 29 of the internally threaded stator 23 while rotating. At this time, since the outer peripheral surface of the female screw type stator 23 can be deformed by contact pressure with the rotor 20, the amount of eccentricity between the central axis 49 of the driven side portion 28 and the central axis 29 of the driving side portion 30. Can be kept small. Accordingly, the rotation of the drive side portion 30 can be smoothly transmitted to the rotor 20 via the driven side portion 28, and as a result, the rotor 20 can be smoothly rotated.

  Further, in each of the above embodiments, as shown in FIG. 1, the outer cylinder 60 is mounted on the outer peripheral surface of the stator 23, and both ends of the stator 23 are sandwiched between the end stud 24 and the casing 25. Although not shown in the drawing, the outer cylinder 60 is omitted, and the stator 23 has a configuration in which the end portion on the side of the eccentric joint 16 is cantilevered by the casing 25. can do. With such a configuration, the free end side portion of the stator 23 can be deformed by the rotation of the rotor 20, and thus the amount of eccentricity between the center of the driven side portion 28 and the center of the drive side portion 30 can be effectively reduced. Can be suppressed. As a result, the rotor 20 can be rotated extremely smoothly.

  And as shown in FIG. 10, the outer cylinder 60 is abbreviate | omitted, and the stator 23 is good also as a structure by which the edge part on the opposite side to the eccentric joint 16 side is cantilever-supported by the casing 25. FIG. In the figure, the inner hole 23a of the stator 23 is omitted. As shown in FIG. 10, the stator 23 has a flange 23 b formed at one end of the stator 23 sandwiched between the end of the casing 25 and the end of the end stud 24. The end is a free end. A gap 61 is formed between the outer peripheral surface of the stator 23 and the inner peripheral surface of the casing 25.

  And in each said embodiment, as shown in FIG. 1, although the eccentric coupling 16 was applied to the pump apparatus 21 grade | etc., It replaces with this and applies to the eccentric shaft coupling for connecting a drive shaft and a driven shaft. be able to.

  Moreover, in each said embodiment, as shown in FIG. 1 etc., although this invention was applied with respect to the pump apparatus provided with the uniaxial eccentric screw pump 19, it is with respect to pump apparatuses provided with pumps other than the uniaxial eccentric screw pump 19. The present invention can be applied. The pump device may be used, for example, for either one of normal rotation and reverse rotation.

  Further, in each of the above-described embodiments, as shown in FIG. 2 and the like, the intermediate portion 31 has a substantially short cylindrical shape, but may have other shapes.

  As described above, the eccentric joint according to the present invention and the pump device including the eccentric joint can be reduced in bulk and weight, and can be allowed to accept a relatively large compressive force and tensile force. And is suitable for application to such an eccentric joint and a pump device including the same.

It is a fragmentary longitudinal cross-section which shows the pump apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows typically the eccentric joint provided in the pump apparatus which concerns on the same 1st Embodiment, (a) is an expansion exploded perspective view, (b) is an expansion perspective view. It is a figure which shows typically the eccentric joint which concerns on the same 1st Embodiment, and is an enlarged longitudinal cross-sectional view for demonstrating that a connection shaft part is rockable. It is a figure which shows the connection shaft part of the eccentric joint which concerns on the same 1st Embodiment, (a) is an expanded longitudinal cross-sectional view of the sleeve with which both ends of the connection shaft part were mounted | worn, (b) is one end of a connection shaft part It is an expanded longitudinal cross-sectional view of the sleeve with which the part was mounted | worn. It is a figure which shows typically the eccentric joint provided in the pump apparatus which concerns on 2nd Embodiment of the invention, (a) is an expansion exploded perspective view, (b) is an expansion perspective view. It is a figure which shows typically the eccentric joint provided in the pump apparatus which concerns on 3rd Embodiment of the invention, (a) is an expansion exploded perspective view, (b) is an expansion perspective view. It is a partial expanded longitudinal cross-sectional view which shows the pump apparatus which concerns on 3rd Embodiment of the same invention. It is an expanded longitudinal cross-sectional view which shows the intermediate part of the eccentric joint provided in the pump apparatus which concerns on 4th Embodiment of the invention. It is an expanded longitudinal cross-sectional view which shows typically the eccentric coupling provided in the pump apparatus which concerns on 5th Embodiment of the invention. It is a fragmentary longitudinal cross-section which shows the pump apparatus which concerns on other embodiment of the same invention. It is a fragmentary longitudinal cross-sectional view which shows an example of the conventional pump apparatus. It is an expanded partial longitudinal cross-sectional view which shows the eccentric joint part of the conventional pump apparatus of FIG.

Explanation of symbols

16, 50, 51, 56, 58 Eccentric joint 17 Drive portion 17a Output shaft 18 Drive shaft 19 Uniaxial eccentric screw pump 20 Rotor 21, 55 Pump device 22 Magnet type connecting portion 23 Stator 23a Inner hole 23b Flange portion 24 End stud 25 Casing 26 First opening portion 27 Second opening portion 28 Driven side portions 29 and 49 Central axis 30 Drive side portion 31 Intermediate portion 32 Driven side main body 32a Coupling hole 33 Connection shaft portion 33a Recessed portion 34 Drive side main body 34a Opening portion 35 Connection hole portion 36, 57 Sleeve 37 Adhesive 38 Annular seal 39 Annular groove 40 First coupling structure 41 Second coupling structure 42 Driven side magnet unit 43 Driving side magnet unit 44 Inner bearing 45 Bearing housing 46 Outer bearing 47 Partition can 48 Coupling housing 52 Reserve Hole part 53 Set bolt 54 Female thread part 59 Communication hole 59a, 59b Opening part 60 Outer cylinder 61 Clearance

Claims (13)

A driving side portion that is rotationally driven, a driven side portion on the driven side, an intermediate portion for connecting the driving side portion and the driven side portion, and transmitting the rotation of the driving side portion to the driven side portion; In an eccentric joint comprising:
The first connection structure of the driving side part and the intermediate part and the second connection structure of the driven side part and the intermediate part are connected to each other by a connection hole provided in one of them. A connecting shaft portion that is provided on the other side and is slidably inserted in the axial direction with respect to the connecting hole portion, the connecting shaft portion of the first connecting structure, and the connecting shaft portion of the second connecting structure; Are eccentric joints, characterized in that they cross each other.   The eccentric joint according to claim 1, wherein the connecting shaft portion of the first connecting structure and the connecting shaft portion of the second connecting structure are substantially orthogonal to each other.   3. The connecting shaft portion of the first and second connecting structures is inserted into the connecting hole portion so that both or one of them can swing around the shaft center. Eccentric joints.   The eccentric joint according to any one of claims 1 to 3, wherein each of the connecting shaft portion and the connecting hole portion in contact with each other has a substantially short cylindrical shape.   5. The sleeve according to claim 1, wherein a sleeve formed of a wear-resistant material or a corrosion-resistant material is provided on one or both of the connecting shaft portion and the connecting hole portion. Eccentric joint according to crab.   The eccentric joint according to any one of claims 1 to 4, wherein a sleeve made of a synthetic resin is provided at one of the connecting shaft portion and the connecting hole portion that are in contact with each other.   The eccentric joint according to claim 1, wherein the intermediate part is made of a synthetic resin.   The eccentric joint according to claim 1, wherein the intermediate hole is provided with the connection hole and a preliminary connection hole equivalent to the connection hole.   The connection shaft portion has an opening portion that opens to the outside at one or both ends and a central side portion, and these opening portions communicate with each other through a communication hole. The eccentric joint according to any one of 1 to 8.   The eccentric joint according to claim 1, wherein the intermediate portion is formed of a substantially short cylindrical member.   An eccentric joint according to any one of claims 1 to 10, and a uniaxial eccentric screw pump driven to rotate by power transmitted by the eccentric joint, wherein the uniaxial eccentric screw pump is coupled to the driven side portion. A pump device comprising a male screw type rotor and a female screw type stator into which the male screw type rotor is fitted. The male screw type rotor is made of metal,
12. The pump according to claim 11, wherein the female screw type stator is made of a synthetic resin, and the outer peripheral surface is opened so that the outer peripheral surface can project and deform by contact pressure with the male screw type rotor. apparatus.   The female thread type stator is provided in a cantilever structure in which an end portion on the side where the eccentric joint is disposed or an end portion opposite to the side where the eccentric joint is disposed is fixed to a casing. The pump device according to claim 12.

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