JP2014228064A - Union pipe joint and canned motor pump having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly attach and detach a union nut to and from a pipe element.SOLUTION: A second pipe element 50 to be connected to a first pipe element includes a pipe body 51 and a union flange part 52 which is protruded from the pipe body 51 towards the radial outside. A union nut 60 includes: a cylinder part 61 having a through-hole into which a connection end 51a of the second pipe element 50 is insertable and a female screw 62 which can threadedly engage with a male screw of the first pipe element and is formed on the inner peripheral side of the through-hole; and an annular inner flange part 63 which is provided at an end of the through-hole and protrudes towards the radial inner side. The second pipe element 50 includes as a union flange part 52: a first union flange part 52a; and a second union flange part 52b which is arranged at a position symmetrical to the first union flange part 52a on the basis of a pipe axis AC of the pipe body 51 while interposing a no-flange part 55 in a circumferential direction between the first and second union flange parts. The length of the second union flange part 52b in a circumferential direction is shorter than that of the first union flange part 52a.

Description

  The present invention relates to a union pipe joint and a canned motor pump having the same.

  As a union pipe joint, there exists what is indicated by the following patent documents 1, for example. The union pipe joint includes a first tubular body in which a male thread is formed on the outer periphery of the connecting end, a second tubular body connected to the connecting end of the first tubular body, and a connecting end of the second tubular body. And a union nut to be inserted. The second tubular body has a tube main body connected to the connection end of the first tubular body, and a union flange projecting radially outward from the outer periphery of the connection end of the tube main body. The union nut has a through-hole into which the connecting end of the second tubular body can be inserted, a cylindrical portion in which a female thread that can be screwed into the male thread of the first tubular body is formed, and a radially inward end at the end of the through-hole. And an annular inner flange projecting toward the front.

  The union nut is rotatably mounted on the outer peripheral side of the connection end portion of the second tubular body in a state where the inner flange portion and the union flange portion of the second tubular body face each other. For this reason, in a state where the union nut is attached to the second tubular body, the union nut is prevented from coming off on the side where the union flange portion of the second tubular body is present with respect to the inner flange portion.

  This union pipe joint is symmetric with respect to the first union flange portion as a union flange portion of the second tubular body, and the tube axis that is the central axis of the tube body with the flange portion sandwiched in the circumferential direction of the tube body. And a second union flange portion disposed at the position. The first union brim part and the second union brim part have the same shape and the same size. For this reason, the length of the 1st union collar part and the 2nd union collar part in the circumferential direction of a pipe body are the same.

  The outer diameter dimension of the second tubular body at the flange portion is smaller than the inner diameter dimension of the inner flange portion of the union nut. For this reason, it can pass easily the inner peripheral side of the inner collar part of a union nut only in the collar part of a 2nd tubular body. On the other hand, the outer diameter dimension of the union collar part which is the maximum distance between the outer edge of the first union collar part and the outer edge of the second union collar part is larger than the inner diameter dimension of the inner collar part of the union nut. Therefore, the tube axis of the second tubular body is inclined with respect to the nut axis that is the central axis of the union nut, and the distance between the outer edge of the first union flange and the outer edge of the second union flange in the radial direction of the union nut. Is made shorter than the inner diameter of the inner flange portion of the union nut, and then the first union flange portion and the second union flange portion are passed through the inner peripheral side of the inner flange portion of the union nut.

  As described above, the union nut can be attached to and detached from the second pipe body even after the production of the second pipe body. For this reason, in this union pipe joint, the manufacturing procedure of the second pipe body is not restricted due to the assembly of the union nut, and the productivity can be improved.

Registered Utility Model No. 3013910

  In the union pipe joint described in Patent Document 1, the second tubular body is inclined with respect to the union nut, and the first union flange portion of the second tube body is passed through the inner peripheral side of the inner flange portion of the union nut. Then, when passing the 2nd union collar part through the inner peripheral side of the inner collar part of a union nut, it is necessary to incline the 2nd pipe body more with respect to a union nut. This is to prevent both ends in the circumferential direction of the second union collar from being caught by the annular inner collar. For this reason, in the union pipe coupling of the said patent document 1, there exists a problem that it is difficult to attach and detach a union nut smoothly with respect to a 2nd pipe body.

  Furthermore, in the union pipe joint described in Patent Document 1, the union nut cannot be attached to and detached from the second tube unless the axis of the second tube is greatly inclined with respect to the axis of the union nut. Therefore, in the union pipe joint described in Patent Document 1, when the second pipe body is largely inclined with respect to the union nut, interference between the inner flange portion of the union nut and the outer peripheral surface of the pipe body in the second pipe body is caused. In order to avoid this, it is necessary to form a throttle portion with a smaller outer diameter and inner diameter in the tube body of the second tubular body. For this reason, in the union pipe joint of the above-mentioned patent documents 1, there also exists a problem that manufacturing cost increases.

  Therefore, an object of the present invention is to provide a union pipe joint that can smoothly attach and detach a union nut and reduce the manufacturing cost, and a canned motor pump including the same.

The union pipe joint as one aspect of the invention for solving the above problems is
A first tube having a male thread formed on the outer periphery of the connection end, a tube main body connected to the connection end of the first tube, and radially outward from the outer periphery of the connection end of the tube main body. A second tubular body having a union flange projecting toward the inside, a through hole into which the connection end of the second tubular body can be inserted, and a female screw that can be screwed into the male screw. A union nut having a cylindrical portion formed on the side and an annular inner flange projecting radially inward at an end of the through hole, and the second tubular body includes the union rod As a part, the 1st union collar part and the 2nd union collar arrange | positioned in the position symmetrical to this 1st union collar part on the basis of the axis line of a pipe body on both sides of the collar part in the circumferential direction of the said pipe body And the length of the second union brim portion in the circumferential direction of the tube body is the first unit. Characterized in that less than the length of the on the flange portion.

  In the union fitting, when the union nut is attached to and detached from the second pipe body, the pipe axis line that is the central axis line of the second pipe body is inclined with respect to the nut axis line that is the central axis line of the union nut, The distance between the outer edge of the first union collar part and the outer edge of the second union collar part in the radial direction of the nut is made shorter than the inner diameter of the inner collar part of the union nut. The circumferential side is passed through the first union brim and the second union brim.

  Therefore, even if the said union pipe joint is after manufacture of a 2nd pipe body, a union nut can be attached or detached with respect to this 2nd pipe body. For this reason, in the union pipe joint, the manufacturing procedure of the second pipe body is not restricted due to the assembly of the union nut, and the productivity can be improved.

  In the union fitting, when removing the union nut attached to the second pipe body, the first union flange portion is more in the nut axial direction than the second union flange portion. The second pipe body is tilted with respect to the union nut so as to be relatively close to the union nut. Next, in a state where the connecting pipe body is inclined with respect to the union nut, the connecting pipe body is arranged in the nut axial direction and the other end portion opposite to the connecting end of the connecting pipe body is away from the union nut. Move the body relative to the union nut. As a result, in the nut axial direction, the first union flange portion that is relatively close to the inner flange portion of the union nut passes through the inner peripheral side of the inner flange portion of the union nut. Next, the second union flange passes through the inner peripheral side of the inner flange of the union nut, and the union nut is detached from the connection pipe body.

  In the union pipe joint, the length of the second union flange in the circumferential direction of the pipe body is shorter than the length of the first union flange. For this reason, when the 2nd union collar passes the inner circumference side of the inner collar part of a union nut after the 1st union collar part passes the inner circumference side of the inner collar part of a union nut, the 2nd union collar part The outer edges of both ends in the circumferential direction are not easily caught by the inner flange of the union nut. Therefore, in the said union pipe joint, attachment / detachment of a union nut can be performed smoothly with respect to a connection pipe body.

  Here, in the union pipe joint, an inlay female portion that forms a cylindrical space on the inner peripheral side is formed at the connection end portion of the first tube body, and the connection end portion of the second tube body In addition, a cylindrical spigot male part that fits into the inner peripheral side of the spigot female part of the first pipe body may be formed on the side to which the first pipe body is connected than the union collar part. Good.

  In the said union pipe joint, the connection stability and sealing performance in the connection part of a 1st pipe body and a 2nd pipe body can be improved.

  In the union pipe joint in which the inlay male portion is formed in the second pipe body, an annular seal groove recessed from the outer peripheral side toward the inner peripheral side is formed in the inlay male portion of the second pipe body. And an annular seal member that fits into the annular seal groove may be provided.

  In the said union pipe joint, the sealing performance in the connection part of a 1st pipe body and a 2nd pipe body can be improved more.

  In any one of the above-described union pipe joints, the tube body of the second tube body is a bent tube, and the outer periphery of the tube body is formed on the first outer peripheral portion that is the inside of the bend. One union flange may be formed, and the second union flange may be formed on the second outer peripheral portion that is the outside of the bend.

  In the union pipe joint, when the union nut attached to the second pipe body is tilted as described above, the other end portion of the connecting pipe body opposite to the connecting end portion is tilted away from the union nut. It will be. Therefore, in the said union pipe joint, when tilting a 2nd pipe body relatively with respect to a union nut, there is no possibility that the other end part of a 2nd pipe body may contact a union nut, and it is easy with respect to a union nut. The second tubular body can be tilted relatively.

The canned motor pump as one aspect of the invention for solving the above problems is
One of the above union fittings, an impeller that rotates about a rotation axis, and a pump casing in which the impeller is disposed, and the pump casing sucks fluid into the interior A suction side tube having an opening and a discharge side tube having a discharge opening for discharging fluid from the inside, and the suction side tube and the discharge side tube , At least one of the tubes forms one of the first tube and the second tube in the union pipe joint.

  According to this invention, a union nut can be smoothly attached or detached with respect to a 2nd pipe body, and also manufacturing cost can be held down.

It is sectional drawing which shows the state before the connection of the 1st pipe body and 2nd pipe body of the union pipe joint in 1st embodiment which concerns on this invention. It is sectional drawing which shows the connection state of the 1st pipe body and 2nd pipe body of the union pipe joint in 1st embodiment which concerns on this invention. It is a principal part notch perspective view of the canned motor type artificial heart pump in 1st embodiment which concerns on this invention. It is a perspective view of the 2nd pipe and union nut in a first embodiment concerning the present invention. It is sectional drawing of the 2nd tubular body in 1st embodiment which concerns on this invention. It is VI arrow directional view in FIG. It is a front view of the union nut in a first embodiment concerning the present invention. It is the VIII-VIII sectional view taken on the line of FIG. It is sectional drawing (the 1) of the 2nd pipe body and union nut in the attachment or detachment process of the union nut with respect to the 2nd pipe body in 1st embodiment which concerns on this invention. It is sectional drawing (the 2) of the 2nd pipe body and union nut in the attachment or detachment process of the union nut with respect to the 2nd pipe body in 1st embodiment which concerns on this invention. It is sectional drawing (the 3) of the 2nd pipe body and union nut in the attachment or detachment process of the union nut with respect to the 2nd pipe body in 1st embodiment which concerns on this invention. It is a figure of the 2nd pipe body in FIG. 9, and the nut axial direction view of a union nut. It is a figure of the nut tube direction view of the 2nd tubular body and union nut in a comparative example. It is principal part sectional drawing of the canned motor type artificial heart pump in 2nd embodiment which concerns on this invention. It is sectional drawing of the connection part of the tubular bodies in the modification of 1st embodiment which concerns on this invention.

  Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

"First embodiment"
First, a first embodiment of a union pipe joint according to the present invention and a canned motor type artificial heart pump including the same will be described with reference to FIGS.

  As shown in FIG. 3, the canned motor type artificial heart pump 10 of the present embodiment is fixed in a pump casing 20 in which a cylindrical penetrating space is formed around a rotation axis Ar, and in the penetrating space of the pump casing 20. A stationary blade portion 35 disposed, an impeller 30 disposed rotatably in the through space, and a blade driving mechanism 40 disposed in the pump casing 20 are provided.

  The penetrating space of the pump casing 20 is a cylindrical space that is long in the direction of the rotation axis extending around the rotation axis Ar with the rotation axis Ar as a center. One end of the pump casing 20 in the direction of the rotation axis forms a suction side tube body 20i in which a suction opening 21 for guiding blood into the through space is formed. Further, the other end of the pump casing 20 in the rotation axis direction forms a discharge-side tube body 20o in which a discharge opening 22 for discharging blood from the through space is formed. The suction side tube body 20i and the discharge side tube body 20o are both cylindrical with the rotation axis Ar as the center.

  The impeller 30 includes a blade support body portion 31 that is formed in a substantially conical shape that is tapered toward the suction opening 21 side, and a plurality of blades 32 that project from the outer periphery of the blade support body portion 31. I have. A permanent magnet is disposed inside the blade support body 31 of the impeller. Each moving blade 32 is a twisted blade extending in a spiral shape on the outer periphery of the blade support body 31. The impeller 30 is rotatably disposed in a portion on the suction opening 21 side in the penetrating space of the pump casing 20. The impeller 30 rotates about the rotation axis Ar, so that the entire blade tip of the impeller 30 is brought into a non-contact state from the inner peripheral surface of the pump casing 20. In other words, the impeller 30 floats from the inner peripheral surface of the pump casing 20 by rotating around the rotation axis Ar.

  The stationary blade portion 35 includes a body portion 36 formed in a substantially conical shape opposite to the blade support body portion 31 of the impeller 30, and a plurality of stationary blades 37 projecting from the outer periphery of the body portion 36. It is equipped with. Each stationary blade 37 is a twisted blade extending in a spiral shape in the opposite direction to the moving blade 32. The stationary blade portion 35 is fixedly disposed at a portion on the discharge opening 22 side in the through space of the pump casing 20.

  The blade drive mechanism 40 generates a rotating magnetic field inside the pump casing 20 and rotationally drives the impeller 30 in which a permanent magnet is built in the through space of the pump casing 20 by the rotating magnetic field.

  The rotationally driven impeller 30 pumps blood supplied to the suction opening 21 to the discharge opening 22. The stationary blade portion 35 fixedly arranged downstream of the impeller 30 increases the static pressure by lowering the flow velocity of blood whose dynamic pressure is increased by the rotation of the impeller 30 and the dynamic pressure is increased. That is, the stationary blade portion 35 converts the dynamic pressure of blood into static pressure.

  As shown in FIGS. 1 and 2, the canned motor type artificial heart pump 10 further includes a union pipe joint 70. The union fitting 70 includes a discharge-side tube (first tube) 20o of the pump casing 20, a connection tube (second tube) 50 connected to the discharge-side tube 20o, and the pump casing 20 The union nut 60 used for the connection of the discharge side pipe body 20o and the connection pipe body 50 is provided.

  A male screw 24 is formed on the outer periphery of the connection end 25 on the discharge opening 22 side of the discharge side tube body 20o. In addition, on the inner periphery of the connection end portion 25, an inlay female portion 26 that forms a cylindrical space having an inner diameter equal to or larger than the inner diameter of the middle body portion of the through space of the pump casing 20 is formed.

  As shown in FIGS. 2, 4, and 5, the connection pipe body 50 is provided on the outer periphery of a pipe main body 51 that is a cylindrical body that provides a flow path and a connection end 51 a that is one end of the pipe main body 51. A formed union flange 52 and a socket 54 formed on the other end 51 b of the tube main body 51 are provided.

  The pipe body 51 is a bent pipe, a so-called elbow pipe. For this reason, the tube axis Ac which is the central axis of the tube body 51 is also bent. As described above, the inside of the connection tube 50 forms a flow path through which blood flows. The flow path diameter of the connection pipe body 50 substantially matches the flow path diameter on the connection end portion 25 side in the discharge side pipe body 20o of the pump casing 20. For this reason, in the state where the connection pipe body 50 is connected to the discharge side pipe body 20o of the pump casing 20, even if the connection pipe body 50 rotates temporarily with respect to the discharge side pipe body 20o, the flow of the discharge side pipe body 20o There is no step between the path and the flow path of the connecting tube 50. Therefore, in the present embodiment, it is possible to suppress the generation of thrombus at the connection portion between the discharge side tube body 20o and the connection tube body 50.

  The socket 54 has an inner diameter larger than the inner diameter of the tube main body 51 and an outer diameter larger than the outer diameter of the tube main body 51. An end portion such as a pipe or a hose is attached to the inner peripheral side of the socket 54.

  The union flange portion 52 projects outward in the radial direction on the outer periphery of the connection end portion 51a of the pipe body 51 on the other end portion 51b side. A cylindrical inlay male portion 53 is formed on the side opposite to the other end portion 51b with the union flange portion 52 as a reference. The outer diameter of the inlay male portion 53 is a size corresponding to the inner diameter of the inlay female portion 26 of the discharge-side tube body 20o, and is fitted firmly on the inner peripheral side of the inlay female portion 26. The inlay male portion 53 is formed with an annular seal groove 56 that is recessed from the outer peripheral side toward the inner peripheral side.

  As shown in FIGS. 4 to 6, the union flange 52 is a first union flange formed on the first outer periphery G <b> 1 that is inside the bend of the tube body 51 on the outer periphery of the connection end 51 a of the tube body 51. And a second union flange portion 52b formed on the second outer peripheral portion G2 which is the outer side of the bending portion 51c. The second union flange portion 52b sandwiches the flange portion 55 in the circumferential direction of the tube body 51, and is disposed at a position symmetrical to the first union flange portion 52a with respect to the tube axis Ac. The outer edge shape of the first union flange portion 52a and the outer edge shape of the second union flange portion 52b are both arc shapes having the same diameter with the tube axis line Ac as the center. However, the length of the second union flange portion 52b in the circumferential direction around the tube axis line Ac is shorter than the length of the first union flange portion 52a. Specifically, the circumferential length of the first union flange portion 52a occupies about 1/3 of the entire circumference of the tube body 51, and is approximately 120 ° when expressed in terms of an angle with respect to the tube axis Ac. is there. The circumferential length of the second union flange portion 52b occupies about 1/4 of the entire circumference of the tube body 51, and is about 90 ° when expressed in terms of an angle with respect to the tube axis Ac.

  The union nut 60 used for the connection between the pump casing 20 and the connecting tube 50 is formed with a through-hole through which the connecting end 51a of the connecting tube 50 can be inserted, as shown in FIGS. A cylindrical portion 61 that is formed, and an annular inner flange portion 63 that protrudes radially inward from the inner periphery of the cylindrical portion 61.

  The inner collar portion 63 is formed on the inner peripheral surface of the cylindrical portion 61 at one end portion in the nut axial direction in which the nut axis An that is the central axis of the cylindrical portion 61 extends. Further, on the other side in the nut axial direction on the inner peripheral surface of the cylindrical portion 61, a female screw 62 is formed on which the male screw 24 of the discharge side tube body 20o can be screwed. Four flat surfaces 64 that are spaced apart from each other in the circumferential direction are formed on the outer peripheral surface of the cylindrical portion 61. Of the four flat surfaces 64, two flat surfaces 64 adjacent in the circumferential direction are orthogonal to each other.

  Here, let the maximum distance between the outer edge of the 1st union collar part 52a and the outer edge of the 2nd union collar part 52b be the outer diameter D of the union collar part 52 (FIG. 6). Further, in the connecting tube 50, the maximum distance between the outer edges of the two flanged portions 55 arranged at positions symmetrical with respect to the tube axis Ac is defined as the outer diameter dimension of the flanged portion 55. The outer diameter D of the union flange 52 is larger than the inner diameter d (FIG. 7) of the annular inner flange 63 of the union nut 60. Further, the outer diameter dimension of the flanged portion 55 is the same as the outer diameter dimension of the inlay male portion 53 of the connecting pipe body 50 and is smaller than the inner diameter dimension d (FIG. 7) of the annular inner flange portion 63. Therefore, the inner peripheral side of the inner flange portion 63 of the union nut 60 can be passed only in the flange portion 55 of the connection tube body 50.

  In a state where the union nut 60 is mounted on the outer peripheral side of the connection end portion 51 a of the connection tube body 50, the outer diameter dimension D of the union flange portion 52 is the inner diameter of the annular inner flange portion 63 in the union nut 60 as described above. Since it is larger than the dimension d, as shown in FIG. 1, the union flange portion 52 of the connecting pipe body 50 and the inner flange portion 63 of the union nut 60 are opposed to each other. For this reason, the inner peripheral side of the inner flange portion 63 of the union nut 60 is connected to the union flange portion 52 of the connection tube body 50 with the tube axis Ac of the connection tube body 50 and the nut axis An of the union nut 60 being in parallel. Can not pass. Therefore, the union flange portion 52 of the connection tube body 50 and the inner flange portion 63 of the union nut 60 function as a retaining member of the union nut 60 with respect to the connection tube body 50. However, in a state where the union nut 60 is mounted on the outer peripheral side of the connection end portion 51 a of the connection tube body 50, the union nut 60 is rotatable about the tube axis line Ac of the connection tube body 50.

  As shown in FIG. 1, an annular seal member 81 is attached to the annular seal groove 56 of the connecting tube 50. In the connection work between the pump casing 20 and the connection pipe body 50, first, the seal member 81 and the union nut 60 are mounted on the connection pipe body 50. Next, in a state where the opening of the connection end portion 51a of the connection pipe body 50 and the discharge opening 22 of the discharge side pipe body 20o in the pump casing 20 face each other, the connection pipe body 50 is brought close to the discharge side pipe body 20o. Then, the union nut 60 attached to the connection pipe body 50 is rotated, and the male screw 24 of the discharge side pipe body 20o is screwed into the female screw 62 of the union nut 60 as shown in FIG. In this process, the inlay male portion 53 of the connecting pipe body 50 is fitted into the inlay female portion 26 of the pump casing 20. Further, the inner peripheral side of the seal member 81 is in close contact with the bottom surface of the seal groove 56 formed in the inlay male portion 53 of the connecting tube 50, and the outer peripheral side of the seal member 81 is the inner periphery of the inrow female portion 26 of the pump casing 20. Adhere to the surface.

  Thus, the connection work between the pump casing 20 and the connecting pipe body 50 is completed. In a state where the pump casing 20 and the connecting pipe 50 are connected, the pipe axis Ac of the connecting pipe 50 and the nut axis of the union nut 60 are on the extension line of the rotation axis Ar of the pump casing 20 as shown in FIG. An is located. In this connected state, the discharge-side tube body 20 o screwed into the union nut 60 cannot be moved relative to either side of the pump casing 20 in the rotation axis direction with respect to the union nut 60. Further, the connection pipe body 50 cannot move to the side away from the discharge side pipe body 20 o of the pump casing 20 with respect to the union nut 60. In other words, the connecting tube 50 is not movable relative to the union nut 60 in the direction of the rotation axis of the pump casing 20 toward the discharge opening 22 with respect to the suction opening 21 side. Therefore, the connection pipe body 50 cannot be moved relative to the discharge opening 22 side in the rotation axis direction of the pump casing 20 by the union nut 60 with respect to the discharge side pipe body 20o. Moreover, since the end surface in the connection end part 51a of the connection pipe body 50 is in contact with the hole bottom surface of the spigot female part 26 of the discharge side pipe body 20o, the connection pipe body 50 is connected to the pump casing 20 with respect to the discharge side pipe body 20o. The relative movement to the suction opening 21 side is impossible in the direction of the rotation axis. Further, since the spigot male part 53 of the connecting pipe 50 is fitted into the spigot female part 26 of the discharge side pipe 20o, the connection pipe 50 is connected to the rotation axis Ar of the pump casing 20 with respect to the discharge side pipe 20o. It is impossible to move relative to the radial direction.

  Therefore, in this connected state, the connection pipe body 50 cannot move relative to either side of the pump casing 20 in the rotation axis direction relative to the discharge side pipe body 20o, and also moves relative to the rotation axis Ar in the radial direction. It is impossible.

  In this embodiment, the inlay male part 53 of the connection pipe body 50 is in contact with the connection pipe body 50 and the discharge side pipe body 20o with an inlay structure that fits into the inlay female part 26 of the discharge side pipe body 20o. Moreover, in the present embodiment, a seal member 81 that seals between the inlay male portion 53 and the inlay female portion 26 is mounted. Therefore, in this embodiment, the sealing performance between the connection pipe body 50 and the discharge side pipe body 20o can be improved. For this reason, by adopting the union pipe joint 70 in the canned motor type artificial heart pump 10, the sealing performance of the connecting portions of the tubular bodies in the canned motor type artificial heart pump 10 can be enhanced.

  In order to release the above connection state, the union nut 60 is rotated relative to the discharge side tube 20o of the pump casing 20, and the female screw 62 of the union nut 60 and the male screw 24 of the discharge side tube 20o are screwed together. Is released. Subsequently, the union nut 60 is moved relatively to the discharge opening 22 side with respect to the suction opening 21 side in the rotation axis direction of the pump casing 20 with respect to the discharge side pipe body 20 o of the pump casing 20, so 53 is pulled out from the spigot female part 26 of the discharge side pipe body 20o.

  The connection release operation between the pump casing 20 and the connection pipe body 50 is thus completed. Even when the release is completed, the union nut 60 is prevented from being detached from the connecting pipe body 50 and is attached.

  Next, the removal operation | work of the union nut 60 with respect to the connection pipe body 50 is demonstrated.

  First, as shown in FIG. 9, the nut axis An of the union nut 60 is inclined by a predetermined angle θ with respect to the tube axis Ac of the connection tube 50 in a virtual plane including the tube axis Ac of the connection tube 50. In this case, the nut axis An of the union nut 60 is inclined relative to the tube axis Ac of the connection pipe 50 toward the side M1 where the bending of the pipe body 51 of the connection pipe 50 is widened. When the union nut 60 is inclined relative to the connecting pipe body 50, the first union rod formed inside the bend of the pipe main body 51 in the connecting pipe body 50 in the nut axial direction in which the nut axis An extends. The second union flange portion 52b formed on the outer side of the bend of the pipe body 51 in the connecting tube 50 and the inner flange portion 63 of the union nut 60 with respect to the distance between the portion 52a and the inner flange portion 63 of the union nut 60. And the distance will increase. In other words, the first union flange portion 52a on the inner side of the curve is relatively closer to the inner flange portion 63 of the union nut 60 in the nut axial direction than the second union flange portion 52b on the outer side of the curve.

  As described above, the outer diameter of the flange 55 in the connecting tube 50 is smaller than the inner diameter d (FIG. 7) of the inner flange 63 of the union nut 60. As long as it is limited, the inner peripheral side of the inner flange 63 of the union nut 60 can be easily passed. Further, as described above, as shown in FIG. 9, as a result of inclining the nut axis An of the union nut 60 with respect to the tube axis Ac of the connecting pipe 50, the first union flange portion 52 a in the radial direction of the union nut 60 is obtained. The distance D1 between the outer edge of the second union flange portion and the outer edge of the second union flange portion is shorter than the inner diameter dimension d of the inner flange portion 63 of the union nut 60. Therefore, if the connecting tube body 50 is inclined with respect to the union nut 60, the inner periphery side of the inner flange portion 63 of the union nut 60 can be passed through the union flange portion 52 of the connection tube body 50.

  Next, as shown in FIG. 10, in a state where the connection tube body 50 is inclined with respect to the union nut 60, the connection tube body 50 is in the nut axial direction and the side where the socket 54 of the connection tube body 50 is separated from the union nut 60. In X1, the connecting tube 50 is moved relative to the union nut 60. As a result, the first union flange portion 52a that is relatively close to the inner flange portion 63 of the union nut 60 passes through the inner peripheral side of the inner flange portion 63 of the union nut 60 in the nut axial direction. At this time, as shown in FIG. 12, the entire outer edge of the second union flange portion 52 b is located on the inner peripheral side of the inner flange portion 63 of the union nut 60 as viewed in the nut axial direction. For this reason, as shown in FIG. 11, the second union rod is moved as shown in FIG. 11 by moving the connection tube 50 relative to the union nut 60 toward the side X1 where the socket 54 of the connection tube 50 is separated from the union nut 60. The portion 52 b passes through the inner peripheral side of the inner flange portion 63 of the union nut 60, and the union nut 60 is detached from the connection pipe body 50.

  Next, the operation of attaching the union nut 60 to the connection pipe body 50 will be described.

  In this case, as shown in FIG. 11, in a state where the union nut 60 is not attached to the connection pipe body 50, the connection pipe is formed in a virtual plane including the pipe axis Ac of the connection pipe body 50 in the same manner as in the removing operation. The nut axis An of the union nut 60 is inclined by a predetermined angle θ with respect to the tube axis Ac of the body 50. In a state where the union nut 60 is inclined with respect to the connecting pipe body 50, the second union flange portion 52b on the outer side of the bend is more union nut in the nut axial direction than the first union flange portion 52a on the inner side of the bend. 60 is relatively close to the inner flange 63.

  Next, while maintaining the inclination of the connecting tube 50 with respect to the union nut 60, the connecting tube 50 is placed in the nut axial direction and the socket 54 of the connecting tube 50 is connected to the union nut 60 as shown in FIGS. 10 and 9. The connecting tube 50 is moved relative to the union nut 60 on the approaching side. As a result, first, in the nut axial direction, the second union flange portion 52b that is relatively close to the inner flange portion 63 of the union nut 60 passes through the inner peripheral side of the inner flange portion 63 of the union nut 60, and thereafter The first union flange portion 52 a passes through the inner peripheral side of the inner flange portion 63 of the union nut 60, and the union nut 60 is attached to the connection pipe body 50.

  As described above, in the present embodiment, the union nut 60 can be attached to and detached from the connection pipe body 50 even after the connection pipe body 50 is manufactured. For this reason, in this union pipe joint, the manufacturing procedure of the connecting pipe 50 is not restricted due to the assembly of the union nut 60, and the productivity can be improved.

  Next, a union pipe joint as a comparative example will be described.

  The union pipe joint of a comparative example differs in the structure of the union collar part of the connection pipe body 50 in the union pipe joint 70 of the said embodiment. As shown in FIG. 13, the union flange portion of the comparative example is also arranged at a symmetric position with respect to the tube axis line Ac on the outer periphery of the connection end portion 51 a of the tube body 51 as in the above embodiment. It has the 1st union collar part 52a and the 2nd union collar part 52c. The length of the first union flange portion 52a in the circumferential direction around the tube axis Ac is the same as the length of the first union flange portion 52a of the above embodiment. On the other hand, the length of the second union flange portion 52c in the circumferential direction is the same as the length of the first union flange portion 52a and is longer than the length of the second union flange portion 52b of the above embodiment.

  In the union pipe joint of the comparative example, when the union nut 60 is removed from the connection tube body 50c, the connection tube body 50c is first inclined relative to the union nut 60 as in the above embodiment. Next, in a state where the connecting pipe body 50 c is inclined with respect to the union nut 60, the connecting pipe body 50 c is arranged on the side in which the socket 54 of the connecting pipe body 50 c is separated from the union nut 60 in the nut axial direction. Move relative to the union nut 60. As a result, first, the first union flange portion 52 a passes through the inner peripheral side of the inner flange portion 63 of the union nut 60. At this time, as shown in FIG. 13, among the outer edges of the second union flange portion 52 c, the outer edges at both ends in the circumferential direction are located on the outer periphery side of the inner flange portion 63 of the union nut 60 as viewed in the nut axial direction. ing. For this reason, even if the connection tube 50c is moved relative to the union nut 60 on the side where the socket 54 of the connection tube 50c is away from the union nut 60, the second union flange portion 52c remains in the union nut 60. It catches on the buttocks 63. For this reason, in this comparative example, it is necessary to incline the connection pipe body 50 c relative to the union nut 60.

  In order to largely incline the connecting pipe body 50c with respect to the union nut 60, in order to avoid contact between the inner flange 63 of the union nut 60 and the outer peripheral surface of the pipe main body 51 of the connecting pipe body 50c, the above-mentioned patent document 1, it is necessary to form a narrowed portion with a small outer diameter and inner diameter in the pipe body 51 of the connecting pipe body 50c.

  Therefore, in the comparative example, it is difficult to smoothly attach / detach the union nut 60 to / from the connection pipe body 50c, and the manufacturing cost of the union pipe joint is increased. On the other hand, in the present embodiment, as described above, the union nut 60 can be smoothly attached to and detached from the connecting pipe body 50, and a restricting portion is provided on the pipe main body 51 of the connecting pipe body 50. Since it does not need to form, the manufacturing cost of the union pipe joint 70 can be held down.

  Here, tentatively, the second union flange portion 52b having a short circumferential length is formed inside the bend of the tube main body 51 in the connecting tube 50, and the first union rod having a long circumferential direction is formed outside the bend. Assume that the portion 52a is formed. Also in this case, when the union nut 60 is removed from the connection pipe body 50, the second union flange portion 52b having a short circumferential length and not easily caught by the inner flange portion 63 of the union nut 60 is replaced with the first union flange portion. It is assumed that the inner peripheral side of the inner flange portion 63 of the union nut 60 is passed after the 52a. In order to realize this, the nut axis An of the union nut 60 is made relative to the pipe axis line Ac of the connection pipe body 50 on the side where the bending of the pipe body 51 of the connection pipe body 50 is narrowed, that is, on the opposite side to the above embodiment. It will be tilted. In this case, the socket 54 formed at the end of the connection tube 50 opposite to the connection end 51a approaches the union nut 60, and the socket 54 contacts the union nut 60 or the like depending on conditions. Therefore, when the second union flange portion 52b is formed inside the bend of the tube main body 51 in the connection tube body 50 and the first union flange portion 52a is formed outside the bend, the tube axis line Ac of the connection tube body 50 is formed. There is a case where the nut axis An of the union nut 60 cannot be sufficiently tilted.

  On the other hand, in this embodiment, when the union nut 60 is attached to and detached from the connection pipe body 50, the pipe of the connection pipe body 50 is within the virtual plane including the pipe axis Ac of the connection pipe body 50 as described above. The nut axis An of the union nut 60 is tilted relative to the tube axis Ac of the connecting pipe 50 on the side M1 where the bending of the main body 51 is widened. In this case, since the socket 54 formed at the end opposite to the connection end 51a of the connection tube 50 moves away from the union nut 60, there is no possibility that the socket 54 contacts the union nut 60 or the like. In addition, the inclination of the nut axis An of the union nut 60 relative to the pipe axis Ac of the connection pipe 50 to the side M1 of the connection pipe 50 where the bend of the pipe body 51 is widened is also felt by the operator. Matching.

  Therefore, in this embodiment, also from this viewpoint, the union nut 60 can be smoothly attached to and detached from the connection pipe body 50.

"Second embodiment"
Next, a second embodiment of a union pipe joint according to the present invention will be described with reference to FIG.

  The union pipe joint 70X of this embodiment is also used for a canned motor type artificial heart pump. This union pipe joint 70X uses the connection pipe body 50x instead of the connection pipe body 50 in the union pipe joint 70 of the first embodiment.

  The connecting pipe body 50x has a pipe body 51x that is straight. In addition, a flexible artificial blood vessel 57 is connected to the other end 51b of the tube main body 51x opposite to the connection end 51a. The distal end portion 57a of the artificial blood vessel 57 is fitted to the outer periphery of the other end portion 51b of the tube main body 51x. Further, the distal end portion 57a of the artificial blood vessel 57 is fixed to the tube main body 51x by a sleeve 58 that is fitted to the tube main body 51x from the outer peripheral side of the distal end portion 57a.

  The union pipe joint 70X of the present embodiment also has a first union flange portion 52a and a second union flange portion 52b formed at the connection end portion 51a of the connection pipe body 50x, and the length of the second union flange portion 52b in the circumferential direction. The length is shorter than the length of the first union flange portion 52a.

  Therefore, in this embodiment, similarly to the first embodiment, the union nut 60 can be smoothly attached to and detached from the connection pipe body 50x, and a restricting portion needs to be formed in the pipe body 51 of the connection pipe body 50x. Therefore, the manufacturing cost of the union pipe joint can be reduced.

"Modification"
In the first embodiment, a socket 54 is formed at the other end of the connection tube 50. However, you may change this socket 54 into the thing of the same structure as the connection end part 25 in the discharge opening 22 side of the discharge side tube 20o of 1st embodiment. That is, as shown in FIG. 15, a male screw 54 a may be formed on the outer periphery of the other end portion of the connection tube body 50. If it changes in this way, another connection pipe 80 can be further connected to the other end of this connection pipe 50 using union nut 60.

  Each of the above embodiments employs the union pipe joint according to the present invention on the discharge side of the artificial heart pump 10. However, the union pipe joint according to the present invention may be employed on the suction side of the artificial heart pump.

  Further, in each of the above embodiments, the pipe body of the pump casing 20 is the first pipe body, and the union flange portion 52 is formed in the connection pipe body 50 connected to the pipe body of the pump casing 20, and this connection pipe body. 50 is the second tubular body. However, the connecting pipe connected to the pipe body of the pump casing 20 may be the first pipe body, a union flange may be formed on the pipe body of the pump casing 20, and the pipe body of the pump casing 20 may be the second pipe body. Good.

  Further, in each of the above embodiments, an inlay structure is adopted as a connection structure between the pipe body of the pump casing 20 and the connection pipe body 50. However, as a connection structure between the pipe body of the pump casing 20 and the connection pipe body 50, a butting structure in which the end face of the pipe body of the pump casing 20 and the end face of the connection pipe body 50 are abutted may be employed.

  Further, in each of the above embodiments, the union pipe joint according to the present invention is adopted for the canned motor type artificial heart pump, but the union pipe joint according to the present invention may be adopted for other fluid machines. Alternatively, the union pipe joint according to the present invention may be employed simply for connection between the pipe bodies.

  10: canned motor type artificial heart pump, 20: pump casing, 20i: suction side tube, 20o: discharge side tube (first tube), 21: suction opening, 22: discharge opening, 24: male screw, 25: Connection end part, 26: Inner female part, 30: Impeller, 50: Connection pipe body (second pipe body), 51, 51x: Pipe body, 51a: Connection end part, 52: Union collar part, 52a: First Union collar, 52b: second union collar, 53: spigot male part, 54: socket, 55: flangeless part, 56: seal groove, 60: union nut, 61: tube part, 62: female thread, 63: inside Hut, 70, 70X: Union fitting, 81: Seal member

Claims (5)

A first tubular body having a male thread formed on the outer periphery of the connecting end;
A second pipe having a pipe main body connected to the connection end of the first pipe, and a union flange projecting radially outward from the outer periphery of the connection end of the pipe main body,
A through-hole into which the connection end of the second tubular body can be inserted, a cylindrical part in which an internal thread that can be screwed into the external thread is formed on the inner peripheral side of the through-hole, and a diameter at the end of the through-hole A union nut having an annular inner flange projecting inward in the direction;
With
The second tubular body is symmetrical with the first union flange as the union flange with the first union flange in the circumferential direction of the tube body and with the axis of the tube body as a reference. A second union collar disposed at a position,
The length of the second union flange in the circumferential direction of the tube body is shorter than the length of the first union flange;
This is a union pipe fitting. An inlay female portion that forms a cylindrical space on the inner peripheral side is formed at the connection end of the first tubular body,
A cylinder that fits into the inner peripheral side of the inner female portion of the first tubular body at the connection end of the second tubular body, on the side to which the first tubular body is connected rather than the union brim portion. A shaped inlay male part is formed,
The union pipe joint according to claim 1 characterized by things. An annular seal groove that is recessed from the outer peripheral side toward the inner peripheral side is formed in the inlay male part of the second tubular body,
An annular seal member fitted into the annular seal groove,
The union pipe joint according to claim 2 characterized by things. The tube body of the second tube body is a bent tube,
The first union brim portion is formed on the first outer peripheral portion that is the outer periphery of the tube main body and is the inner side of the bend, and the second union brim portion is formed on the second outer peripheral portion that is the outer side of the bend. ,
The union pipe joint according to any one of claims 1 to 3 characterized by things. The union fitting according to any one of claims 1 to 4,
An impeller that rotates about a rotation axis;
A pump casing in which the impeller is disposed;
With
The pump casing has a suction side tube body in which a suction opening for introducing fluid into the inside is formed, and a discharge side tube body in which a discharge opening for discharging fluid from the inside is formed,
Among the suction side pipe body and the discharge side pipe body, at least one pipe body forms one pipe body of the first pipe body and the second pipe body in the union pipe joint.
A canned motor pump.

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