JP2014149026A - Piping system and pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily modify the positioning between an end connection of piping and a pipeline.SOLUTION: A joint 70 comprises: a first connection 71 having a first insertion port 73 formed thereon, into which a first piping 50 is inserted in a non-screw system such that the first connection 71 is connected to the first piping 50; and a second connection 72 having a second insertion port 75 formed thereon, into which a second piping 60 is inserted such that the second connection 72 is connected to the second piping 60. Between a first inner surface that forms the first insertion port and the first piping, a first clearance 77 is formed to have a size, within which the first piping 50 is displaceable at least in one direction on a virtual orthogonal surface which is orthogonal to s first direction, which is an opening direction of the first insertion port 73. A first through hole 83 is formed, into which the first piping 50 is inserted such that the first through hole 83 is fitted to the outer periphery of the first piping 50 and a surface which directs in the first direction in the first connection 71 is abutted to the circumference of the first insertion port 73 so as to provide a first seal portion 80 for sealing the first clearance 77.

Description

  The present invention relates to a technique for connecting a pipe and a joint.

  In a fluid machine, a small pipe may be provided outside the machine in order to supply a fluid to each component part. For example, in a pump, when a balance disk and a balance sheet are used to cancel the thrust force generated by the operation of the pump, a small pipe (so-called balance pipe) leading from the balance chamber to the suction casing is required. Alternatively, in the pump, when sealing is performed by supplying pressure water to the shaft seal portion, a small pipe (so-called sealing pipe) for supplying pressure water is required. In such small pipes, a desired fluid path is usually realized by connecting a plurality of pipes respectively connected to a plurality of pipe connection ports on the machine side through joints.

JP 2000-234596 A

  However, since a machining tolerance is generated in the fluid machine and the pipe, there may be a problem in the pipe connection work. For example, when two pipe connection ports on the machine side are formed with a machining tolerance shifted from a predetermined position, one of the two pipes connected by a joint is connected to one of the pipe connection ports on the machine side In this case, misalignment occurs between the other pipe and the connection port on the other machine side, and it may be difficult to align the other pipe and the other pipe connection port. In particular, in a multi-stage pump, the larger the number of stages, the more processing tolerances per component are accumulated, so this problem is likely to occur. Also, in fluid machinery that requires miniaturization, the pipe to be connected may be extremely short. In such a case, the cost for correcting the deflection angle of the pipe is extremely small. It becomes more difficult to align the position. Such a problem is common even when three or more pipes are connected by a joint. Moreover, it is common not only to a pump but to various fluid machines such as a blower and a compressor.

  For such a problem, it is possible to employ a flexible pipe made of metal or resin. However, metal flexible piping is expensive. Moreover, since the metal flexible pipe has a minimum bending radius, it is poor in versatility, and furthermore, when the length of the pipe is short, a desired amount of bending cannot be obtained and routing is difficult. . In addition, the resin-made flexible piping has room for improvement in weather resistance, such as the connection portion being disconnected due to freezing when used in a cold region. Moreover, the resin-made flexible piping is easily deformed, and a desired strength may not be obtained.

  Further, in connecting pipes, excellent sealing performance is required as a general problem.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as, for example, the following forms.

The 1st form of this invention is provided as a piping system. This piping system is a first connecting portion in which a first piping, a second piping different from the first piping, and a first insertion port are formed, and the first piping is a non-screw type. A first connection part inserted into the first insertion port and connected to the first pipe; and a second connection part formed with a second insertion port, wherein the second pipe is the second connection part. A joint having a second connection portion that is inserted into the insertion port and connected to the second pipe. Between the 1st inner surface which forms the 1st insertion slot in the 1st connection part, and the 1st piping, the 1st direction which is the direction which the 1st insertion slot opens is the 1st direction which intersects perpendicularly. A first gap having a size capable of displacing the first pipe is formed in at least one direction on one virtual orthogonal plane. The piping system further includes a first seal portion in which a first through hole is formed, the first piping is inserted into the first through hole, and fitted to the outer periphery of the first piping. The first connection portion includes a first seal portion that abuts the surface of the first connection portion facing the first direction around the first insertion port and seals the first gap.

  According to this piping system, after connecting the second piping and the connection port on the device side to which the second piping is connected, the first piping is placed on the first virtual orthogonal plane within the first gap. By moving in the at least one direction, it is possible to correct a positional deviation between the first pipe and the connection port on the device side to which the first pipe is connected. As a result, the piping can be easily aligned. Moreover, since the first pipe and the first connection portion are connected by a non-screw method, high sealing performance can be secured by the seal portion.

  As a second mode of the present invention, the piping system of the first mode is further fixed to the joint in a state where at least a part of the first seal portion is sandwiched between the joint and the first seal portion. A first pressing member that presses in the direction may be provided. According to this aspect, the first seal portion can be fixed to the joint while being sandwiched between the joint and the first pressing member with a simple configuration, and the first seal portion is pressed in the direction of the joint. Thus, a seal can be reliably secured.

  As a third aspect of the present invention, in the first or second aspect, the first gap is formed in such a size that the first pipe can be displaced in any direction on the first virtual orthogonal plane. May be. According to this mode, the first pipe can be moved in any direction on the first virtual orthogonal plane, so that the positioning of the pipe is further facilitated.

  As a fourth aspect of the present invention, the piping system according to any one of the first to third aspects may further include a first fixing portion that fixes the first sealing member and the first piping. Good. According to this form, even if the pressure of the fluid flowing in the pipe is high, the first pipe does not come out of the joint due to the pressure.

  As a fifth aspect of the present invention, in any of the first to fourth aspects, the second connection part may be such that the second pipe is inserted into the second insertion port in a non-screw manner. . A second gap between the second inner surface forming the second insertion port in the second connection portion and the second pipe is provided on the outer periphery of the second pipe in the second gap. The sealing member may be sealed. According to such a form, the second pipe can be moved in the direction in which the second insertion port opens in a state in which the seal is secured by the seal member, so that the alignment becomes easy. In addition, since the second gap is formed, the inclination of the second pipe with respect to the direction in which the second insertion port is opened can be finely adjusted, and the pipe can be easily aligned.

As a sixth aspect of the present invention, in any one of the first to fourth aspects, the second inner surface forming the second insertion port in the second connecting portion and the second pipe The second gap having a size that allows the second pipe to be displaced in at least one direction along the second virtual orthogonal plane orthogonal to the second direction, which is the direction in which the second insertion port opens. It may be formed. The piping system further includes a second seal portion in which a second through hole is formed, and the second piping is inserted into the second through hole and fitted to the outer periphery of the second piping. The second connecting portion may be provided with a second seal portion that abuts the surface of the second connection portion facing the second direction around the second insertion port and seals the second gap. According to such a configuration, the second connection portion has the same effect as the first connection portion, so that the alignment of the pipes is further facilitated.

  The seventh aspect of the present invention is provided as a pump including the piping system according to any one of the first to sixth aspects. According to such a pump, the same effects as those of the first to sixth embodiments are obtained.

It is explanatory drawing which shows schematic structure of the pump as an Example of this invention. It is sectional drawing which shows schematic structure of the piping system as 1st Example. It is explanatory drawing which shows the assembly procedure of the piping system as 1st Example. It is sectional drawing which shows schematic structure of the piping system as a comparative example. It is explanatory drawing which shows the assembly procedure of the piping system as a comparative example. It is sectional drawing which shows schematic structure of the piping system as 2nd Example. It is sectional drawing which shows schematic structure of the piping system as 3rd Example. It is sectional drawing which shows schematic structure of the piping system as 4th Example.

A. Example:
FIG. 1 shows a schematic configuration of a pump 20 as an embodiment of the present invention. In this embodiment, the pump 20 is a multistage centrifugal pump for feeding water. The pump 20 includes a main shaft 21 that is rotationally driven by a motor 30, a plurality of intermediate casings 22 that accommodate a plurality of impellers (not shown) fixed to the main shaft 21, a suction casing 23, a discharge casing 24, And a balance chamber 25. The balance chamber 25 is provided to cancel the thrust force generated in the impeller by the operation of the pump 20 in the direction from the discharge side to the suction side. The balance chamber 25 is connected to the suction casing 23 via the piping system 40. Since the configuration for canceling out the thrust force is known, the description thereof is omitted. In addition, two shaft sealing portions (not shown) of the pump 20 are connected to the intermediate casing 22 via the piping system 110. The pressure water flowing into the piping system 110 from the intermediate casing 22 is supplied to each shaft seal portion from the two branched pipes, whereby the shaft seal portion is sealed.

  The piping system 40 includes a first piping 50, a second piping 60, and a joint 70 for connecting them. In the present embodiment, each of the first pipe 50 and the second pipe 60 has a circular cross section and is formed to extend linearly. The second pipe 60 is formed to be very short compared to the first pipe 50.

  FIG. 2 shows details of the piping system 40. As shown in the figure, a taper screw portion 51 is formed at one end of the first pipe 50. At the other end of the first pipe 50, a processed portion 52 is formed in which the outer peripheral surface is processed into a smooth circle. A taper screw portion 61 is formed at one end of the second pipe 60. On the outer peripheral surface of the other end of the second pipe 60, an annular groove 63 for arranging an O-ring 65 as a seal member is formed along the circumferential direction.

The joint 70 includes a first connection portion 71 and a second connection portion 72. The first connection portion 71 is formed with a first insertion port 73 for inserting a pipe. In the present embodiment, the first insertion port 73 opens toward the X-axis direction of the XYZ orthogonal coordinate system. In the present embodiment, the first insertion port 73 is formed in an elliptical shape. However, the shape of the first insertion port 73 is not particularly limited, and may be, for example, a perfect circle shape or a rectangular shape. The direction in which the first insertion port 73 opens is also referred to as a first direction D1. The inner surface forming the first insertion port 73 in the first connection portion 71 is also referred to as an inner surface 74. The second connection portion 72 is formed with a second insertion port 75 for inserting a pipe. In the present embodiment, the second insertion port 75 opens toward the Y-axis direction. In the present embodiment, the second insertion port 75 is formed in a circular shape. The direction in which the second insertion port 75 opens is also referred to as a second direction D2. The inner surface forming the second insertion opening 75 in the second connection portion 72 is also referred to as an inner surface 76.

  One end side of the first pipe 50 is connected to the suction casing 23 by a screw method by inserting the taper screw portion 51 into the connection port 23 a of the suction casing 23. On the other end side of the first pipe 50, the processing portion 52 is inserted into the first insertion port 73 of the first connection portion 71. The first insertion port 73 is formed larger than the outer diameter of the processed portion 52. As a result, a first gap 77 is formed between the inner surface 74 and the processed portion 52. In the present embodiment, the first gap 77 is a virtual orthogonal plane (YZ plane) orthogonal to the first direction D1 (X-axis direction) in a state where the processing portion 52 is disposed concentrically with the first insertion port 73. It is formed in any radial direction above. Of the first gaps 77, the gaps in the Y-axis direction are also called gaps 77y, and the gaps in the Z-axis direction are also called gaps 77z. In this embodiment, the Y axis coincides with the elliptical short axis of the first insertion port 73, and the Z axis coincides with the long axis. For this reason, the gap 77z is formed larger than the gap 77y. However, the size of each direction of the first gap 77 can be arbitrarily set according to the direction in which the machining tolerance is likely to occur.

  As shown in FIG. 2, the piping system 40 further includes a first seal portion 80, a first pressing portion 90, and a fixing portion 95. The first seal portion 80 includes a first member 81, a second member 82, and O-rings 85 and 86 as seal members. The first member 81 and the second member 82 have a shape in which two cylinders having different outer diameters are combined, and a first through hole 83 penetrating in the first direction D1 is formed therein. Is formed. The processed portion 52 is inserted into the first through hole 83.

  A groove 87 is formed on the end surface of the second member 82 located on the joint 70 side of the first member 81 on the first insertion port 73 side. The second member 82 abuts the surface 79 of the first connecting portion 71 facing the first direction D1 around the first insertion port 73 via an O-ring 85 disposed in the groove portion 87. ing. As a result, the first gap 77 is sealed in an arbitrary direction on the YZ plane. Further, a groove portion 88 is formed on the inner surface of the second member 82 forming the first through hole 83, and an O-ring 86 is disposed in the groove portion 88, so that the second member 82 and the second member 82 are processed. The outer peripheral surface of the part 52 is fitted, and the first gap 77 is sealed in the X-axis direction.

  In the present embodiment, the first member 81 is disposed inside the first connection portion 71. In the YZ plane shape, a gap 89 having the same size as or larger than the first gap 77 is formed between the first seal portion 80 and the first connection portion 71. As will be described later, the gap 89 is different from the first seal part 80 when the processed part 52 and the first seal part 80 are moved in an arbitrary direction on the YZ plane within the range of the first gap 77. It is formed so that the first connecting portion 71 is in contact with the first connecting portion 71 so that the movement is not hindered.

  The groove portion 88 is formed at the end portion of the second member 82 in the X-axis direction. Thus, by forming the first member 81 and the second member 82 separately and forming the groove 88 at the end of the second member 82, the processing of the groove 88 is facilitated. However, the first member 81 and the second member 82 may be integrally formed.

The first pressing portion 90 is fixed to the joint 70 by tightening the bolt 92 in a state where at least a part of the first seal portion 80 is sandwiched between the first pressing portion 90 and the joint 70. In the present embodiment, the first pressing portion 90 is formed in a cover shape that covers the first connection portion 71 side of the joint 70. A through hole 91 through which the processed portion 52 and the first seal portion 80 pass is formed in the center of the first pressing portion 90. The site | part around the through-hole 91 of the 1st press part 90 contact | abuts to the 1st member 81 of the 1st seal part 80, and presses the 1st seal part 80 to the joint 70 side. According to such a configuration, the first seal portion 80 can be fixed to the joint 70 with a simple configuration, and a seal by the O-ring 85 can be reliably ensured.

  The fixing portion 95 fixes the first seal portion 80 (more specifically, the first member 81) and the processing portion 52. In the present embodiment, the fixing portion 95 is a set screw. Since the first seal portion 80 is fixed to the joint 70 by the first pressing portion 90, the first seal portion 80 and the processing portion 52 are fixed, so that the processing portion 52 and the joint 70 are fixed. The fixed relationship becomes stronger. For this reason, according to this configuration, even when the pressure of the fluid flowing in the piping system 40 is high, the first piping 50 does not come out of the joint 70 due to the pressure. When the pressure of the fluid flowing through the piping system 40 is low, the fixing unit 95 can be omitted. Conversely, when the fixing portion 95 is provided, the first pressing portion 90 can be omitted by making the fixing portion 95 also have the function of the first pressing portion 90.

  With the configuration described above, the first pipe 50 is connected to the first connecting portion 71 in a non-screw manner in a state where the first gap 77 is formed and the first gap 77 is sealed.

  One end side of the second pipe 60 is connected to the discharge casing 24 by a screw method by inserting a taper screw portion 61 into the connection port 24 a of the discharge casing 24. The other end of the second pipe 60 is inserted into the second insertion port 75 of the second connection portion 72 by a non-screw method. The inner diameter of the inner surface 76 of the second connection portion 72 that forms the second insertion port 75 is formed larger than the outer diameter of the second pipe 60. As a result, a second gap 78 is formed between the inner surface 76 and the second pipe 60. The second gap 78 is sealed by an O-ring 65 provided on the outer periphery of the second pipe 60 in the second gap 78. With this configuration, the second pipe 60 is connected to the second connecting portion 72 in a non-screw manner in a state where the second gap 78 is formed and the second gap 78 is sealed.

  FIG. 3 shows an example of the assembly procedure of the piping system 40. When the piping system 40 is assembled, first, the second piping 60 is connected to the discharge casing 24 as shown in FIG. Next, an O-ring 65 is attached to the annular groove 63 of the second pipe 60. Next, O-rings 85 and 86 are attached to the first seal portion 80, and the first seal portion 80 and the first pressing portion 90 are attached to the joint 70. At this time, the bolt 92 is tightened to such an extent that the first seal portion 80 can freely move in any direction on the YZ plane, and the first pressing portion 90 is temporarily secured. Next, the first pipe 50 is inserted into the first through hole 83 of the first seal portion 80 and the first insertion port 73 of the first connection portion 71. At this time, the first pipe 50 is inserted deeper on the joint 70 side than the final connection position.

  Next, as shown in FIG. 3B, the second pipe 60 connected to the discharge casing 24 is inserted and connected to the second insertion port 75 of the joint 70 into which the first pipe 50 is inserted. To do. Next, the first pipe 50 is pulled out in the direction of the suction casing 23 (X-axis direction), and the first pipe 50 is moved in an arbitrary direction on the YZ plane within the range of the first gap 77. The positions of the taper screw part 51 and the connection port 23a are aligned. As is clear from this description, the length of the processing portion 52 may be set in consideration of the length for pulling out the first pipe 50. Since the 1st seal | sticker part 80 is fitted by the process part 52, when the 1st piping 50 is moved to the direction on a YZ plane, the 1st piping 50 and the 1st seal | sticker part 80 are the same. , Move together. Next, as shown in FIG. 3C, the taper screw portion 51 of the first pipe 50 is connected to the suction casing 23. Then, after confirming that an excessive force is not applied to the joint 70, the bolt 92 is finally tightened to fix the first seal portion 80 and the joint 70, and the fixing portion 95 is attached. The first pipe 50 and the first seal portion 80 are fixed. Thus, the assembly of the piping system 40 is completed.

  In order to further clarify the effect of the joint 70 described above, a piping system 140 as a comparative example will be described. FIG. 4 shows a state where the piping system 140 is assembled. In FIG. 4, the same components as those of the above-described piping system 40 are denoted by the same reference numerals as those in FIG. Hereinafter, only the differences between the piping system 140 and the piping system 40 will be described. As shown in the figure, a parallel screw portion 154 is formed at the other end of the first pipe 150. A taper screw part 164 is formed at the other end of the second pipe 160. The first pipe 150 is connected to the first connection portion 171 of the joint 170 by a screw method. The second pipe 160 is connected to the second connection portion 172 of the joint 170 by a screw method. A lock nut 180 is inserted into the parallel screw portion 154, and an O-ring 185 is provided on the taper portion 181 of the lock nut 180. When the lock nut 180 is tightened to the joint 170 side, the gap between the joint 170 and the parallel threaded portion 154 is sealed by the O-ring 185.

  FIG. 5 shows an assembly procedure of the piping system 140. When assembling the piping system 140, first, the lock nut 180 and the O-ring 185 are attached to the parallel threaded portion 154 of the first piping 150, and the parallel threaded portion 154 is connected to the first connecting portion 171 by a screw method. . At this time, the first pipe 150 is inserted deeper into the joint 170 than the final connection position. Next, as shown in FIG. 5A, the taper screw portion 61 of the second pipe 160 and the discharge casing 24 are connected by a screw method, and the first pipe 150 and the joint 170 are turned to turn the taper screw portion 164. And the second connection portion 172 of the joint 170 are connected by a screw method. At this time, the second pipe 160 is screwed into the joint 170 until the positions of the taper screw portion 51 and the connection port 23a in the Y-axis direction are matched as much as possible. In this method, the taper screw 51 and the connection port 23a can be aligned only in units of the screw pitch of the taper screw 164 in the Y-axis direction.

  Next, as shown in FIG. 5B, the first pipe 150 is turned in the direction of pulling out from the first connection part 171 to connect the suction casing 23 and the taper screw part 51 of the first pipe 50. Then, as shown in FIG. 5C, the lock nut 180 is tightened to the joint 170 side, and sealing is performed by the O-ring 185. Thus, the assembly of the piping system 140 is completed.

  In such a piping system 140, the taper screw portion 51 and the connection port 23a cannot be accurately aligned in the Y-axis direction. In addition, in the Z-axis direction, the taper screw portion 51 and the connection port 23a cannot be aligned at all. For this reason, the situation which cannot connect the taper screw part 51 and the suction casing 23 may generate | occur | produce. Even if the connection can be made, the screw structure of the suction casing 23 and the taper screw part 51 may be crushed by screwing the taper screw part 51 into the connection port 23a in a state where the eccentricity or the declination has occurred. Furthermore, since the O-ring 185 is disposed around the parallel screw portion 154, that is, the screw structure, there is a possibility that sufficient sealing performance may not be obtained.

On the other hand, according to the piping system 40 of the present embodiment, after connecting the second piping 60 and the connection port 24a of the discharge casing 24, the first piping 50 and the first seal portion 80 are connected to the first gap. The first pipe 50 and the connection port 23a of the suction casing 23 can be suitably aligned by moving in any direction on the YZ plane within a range of 77. That is, fine adjustment of alignment in the Y-axis direction and alignment in the Z-axis direction, which cannot be realized by the piping system 140, are possible. Moreover, since the first pipe 50 and the first connection portion 71 are connected by a non-screw method, the first seal portion 80 can ensure high sealing performance. Moreover, depending on the setting of the size of the first gap 77, the degree of freedom of alignment can be increased, and the versatility is excellent. Even if the length of the second pipe 60 is short, the degree of freedom in adjusting the alignment does not decrease.
Furthermore, metal piping can be used, and sufficient strength and weather resistance can be obtained.

  It is also possible to move the second pipe 60 in the second direction D2 (Y-axis direction) with the seal secured by the O-ring 65 at the second connection portion 72 of the joint 70, thereby The degree of freedom in alignment can be further increased. Moreover, according to the piping system 40, since the second gap 78 is formed between the second piping 60 and the inner surface 76 of the second connection portion 72, the second insertion port 75 and the second insertion port 75 are connected to the second insertion port 75. From the concentric state with the pipe 60, the inclination of the second pipe 60 can be finely adjusted, thereby further increasing the degree of freedom in alignment.

B. Second embodiment:
FIG. 6 shows a schematic configuration of a piping system 240 as a second embodiment of the present invention. In FIG. 6, components having the same configuration as the piping system 40 of the first embodiment are denoted by the same reference numerals as those in FIG. Hereinafter, only the differences between the piping system 240 and the piping system 40 will be described. The first seal portion 280a that seals the first gap 77 of the first connection portion 71 of the joint 270 includes a first member 281a, a second member 282a, and O-rings 285a and 286a. The configurations of the second member 282a and the O-rings 285a and 286a are the same as those of the second member 82 and the O-rings 85 and 86 of the first embodiment. The first member 281a has the same outer diameter as the second member 282a. In this example, the fixing portion 95 of the first embodiment is not used.

  Except for the taper screw portion 61, the second pipe 260 is processed into a circular shape with a smooth outer peripheral surface. The second connection portion 272 has the same configuration as the first connection portion 71, and a second gap is provided between the inner surface 276 of the second insertion port 275 and the second pipe 260. 278 is formed. The second seal portion 280b has the same configuration as the first seal portion 280a, and includes a first member 281b, a second member 282b, and O-rings 285b and 286b. That is, the piping system 240 is configured to be movable in any direction on a plane on the YZ plane for the second piping 260 in addition to the first piping 50. According to this configuration, alignment can be performed more easily. In the second embodiment, at least one of the first seal portion 280a or the second seal portion 280b may have the same shape as the first seal portion 80 of the first embodiment, and the fixing portion 95 may be used. Good.

C. Third embodiment:
FIG. 7 shows a schematic configuration of a piping system 340 as a third embodiment of the present invention. In FIG. 7, components having the same configuration as the piping system 40 of the first embodiment are denoted by the same reference numerals as those in FIG. Hereinafter, only the differences between the piping system 340 and the piping system 40 will be described. The piping system 340 includes a first seal portion 380 instead of the first seal portion 80 of the first embodiment. The first seal portion 380 includes a first member 386 and a second member 382. The joint 70 side of the second member 382 is in contact with the first connection portion 71 via the O-ring 385, as in the first embodiment. On the suction casing 23 side (the side opposite to the joint 70) of the second member 382, a tapered portion 387 whose opening gradually increases toward the suction casing 23 is formed. The tapered portion 387 is formed in an annular shape around the processed portion 52.

A first member 386 that is a tapered ring-shaped member whose outer diameter decreases toward the joint 70 is inserted into the tapered portion 387. The first member 386 has elasticity and is fitted to the outer periphery of the processed portion 52 so as to be sealed. The first member 386 can be, for example, a tapered rubber member. In order to obtain the same function as the rubber member, the first member 386 may be a tapered collet, and an O-ring may be inserted between the tapered portion 387 and the tapered collet. According to these structures, the first gap 77 can be suitably sealed by the first member 386. In addition, the first member 386 and the processed portion 52 can be fixed by the frictional force acting between the first member 386 and the processed portion 52. That is, the first member 386 can also function as the fixing portion 95 in the first embodiment.

D. Fourth embodiment:
FIG. 8 shows a schematic configuration of a piping system 440 as a fourth embodiment of the present invention. In FIG. 8, the same components as those in the piping systems 40 and 240 of the first and second embodiments are denoted by the same reference numerals as those in FIG. 2 or FIG. Hereinafter, only differences between the piping system 440 and the piping systems 40 and 240 will be described. As shown in the drawing, in the piping system 440, the second piping 460 has a mirror image symmetrical shape with the first piping 50, and includes a taper screw portion 461 and a processing portion 462. In the joint 470 of the piping system 440, the first direction D1 that is the direction in which the first insertion port 73 opens and the second direction D2 that is the direction in which the second insertion port 475 opens are both X It is set in the axial direction. The second connection portion 472 has a mirror image symmetrical shape with the first connection portion 71. The second seal portion 480 has a mirror image symmetrical shape with the first seal portion 280a, and includes a first member 481, a second member 482, and a second pressing portion 490. A second gap 478 similar to the first gap 77 of the first connection portion 71 is formed between the inner surface 476 of the second connection portion 472 and the processing portion 462.

  The first pipe 50 and the second pipe 460 connect the connection port 23 a of the suction casing 23 and the connection port 424 a of the discharge casing 424 in a straight line via a joint 470. According to such a configuration, even when eccentricity occurs in the connection port 23a and the connection port 424a arranged in the same direction, the eccentricity can be absorbed.

E. Variations:
E-1. Modification 1:
The above-described piping system as an embodiment may connect three or more pipes by joints, and may be applied to, for example, the piping system 110 (see FIG. 1). Further, the piping system as the above-described embodiment is not limited to the pump 20 and may be applied to various fluid devices such as a blower and a compressor.

E-2. Modification 2:
In the first embodiment, the first gap 77 allows the first pipe 50 to be displaced in at least one direction on the YZ plane orthogonal to the first direction D1, which is the direction in which the first insertion port 73 opens. It may be formed in any size. For example, the shape of the first insertion port 73 is formed in a rectangular shape having a short side in the Y-axis direction and a long side in the Z-axis direction, and the short side is formed to be approximately equal to the outer diameter of the first pipe 50. It may be. Alternatively, the shape of the first insertion port 73 may be a long hole shape in which both ends of the rectangular shape are formed in a semicircular shape. In such a case, the first pipe 50 can be displaced only in the Z-axis direction. The same applies to the second to fourth embodiments.

  The embodiments of the present invention have been described above based on some examples. However, the above-described embodiments of the present invention are for facilitating the understanding of the present invention and limit the present invention. It is not a thing. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Moreover, in the range which can solve at least one part of the subject mentioned above, or the range which exhibits at least one part of an effect, the combination of each component described in the claim and the specification, or omission is possible. .

DESCRIPTION OF SYMBOLS 20 ... Pump 21 ... Main shaft 22 ... Intermediate casing 23 ... Suction casing 23a, 24a, 424a ... Connection port 23 ... Suction casing 24, 424 ... Discharge casing 25 ... Balance chamber 30 ... Motor 40, 240, 340, 440 ... Piping system 50 ... 1st piping 51 ... Tapered screw part 52 ... Processed part 60, 260, 460 ... 2nd piping 61,461 ... Tapered screw part 63 ... Annular groove 65 ... O-ring 70,270,470 ... Joint 71 ... 1st connection Part 72,272,472 ... 2nd connection part 73 ... 1st insertion port 74,76,276,476 ... Inner surface 75,275,475 ... 2nd insertion port 77 (77y, 77z) ... 1st clearance gap 78,278,478 ... second gap 79 ... surface 80,280a, 380 ... first seal part 81,281a, 281b, 481 1st member 82,282a, 282b, 382 ... 2nd member 83 ... 1st through-hole 85,86,285a, 285b, 385 ... O-ring 87,88 ... groove part 89 ... gap 90 ... 1st press part 91 ... Through hole 92 ... Bolt 95 ... Fixing part 110 ... Piping system 280b, 480 ... Second seal part 386 ... First member 387 ... Taper part 462 ... Processing part 490 ... Second pressing part D1 ... First Direction D2 ... Second direction

Claims (7)

A piping system,
A first pipe;
A second pipe different from the first pipe;
A first connecting portion formed with a first insertion port, wherein the first pipe is inserted into the first insertion port in a non-screw manner and connected to the first pipe. A second connecting portion formed with a connecting portion and a second insertion port, wherein the second pipe is inserted into the second insertion port and connected to the second piping. A joint having a connection portion, and
A first direction which is a direction in which the first insertion port opens between the first inner surface forming the first insertion port in the first connection portion and the first pipe. A first gap having a size capable of displacing the first pipe is formed in at least one direction on a first virtual orthogonal plane orthogonal to
The piping system further includes a first seal portion in which a first through hole is formed, and the first piping is inserted into the first through hole and fitted to the outer periphery of the first piping. A piping system comprising a first seal portion that abuts the surface of the first connection portion facing the first direction and the periphery of the first insertion port and seals the first gap. . The piping system according to claim 1,
Furthermore, a first pressing member that is fixed to the joint in a state where at least a part of the first seal part is sandwiched between the joint and that presses the first seal part in the direction of the joint is provided. Piping system. The piping system according to claim 1 or 2,
The piping system in which the first gap is formed in such a size that the first piping can be displaced in an arbitrary direction on the first virtual orthogonal plane. A piping system according to any one of claims 1 to 3,
Furthermore, the piping system provided with the 1st fixing | fixed part which fixes said 1st sealing member and said 1st piping. A piping system according to any one of claims 1 to 4,
In the second connection portion, the second pipe is inserted into the second insertion port by the non-screw method,
The second gap between the second inner surface forming the second insertion port in the second connection portion and the second pipe is the second pipe in the second gap. Piping system sealed by a sealing member provided on the outer periphery of the pipe. A piping system according to any one of claims 1 to 4,
A second direction that is a direction in which the second insertion port opens between a second inner surface that forms the second insertion port in the second connection portion and the second pipe. A second gap having a size capable of displacing the second pipe is formed in at least one direction along a second virtual orthogonal plane orthogonal to
The pipe system further includes a second seal portion in which a second through hole is formed, and the second pipe is inserted into the second through hole and fitted to the outer periphery of the second pipe. The second connection portion is in contact with a surface facing the second direction around the second insertion port, and the second connection portion
A piping system provided with a second seal portion that seals the gap.   The pump provided with the piping system as described in any one of Claims 1 thru | or 6.

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