JP2014025576A - Tube joint and joint unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube joint and a joint unit which allow construction work to be easily carried out in a short time and compact piping to be constructed.SOLUTION: The tube joint includes: a joint body 2 where a flow path 12 is formed and a nozzle part 8 having an outer peripheral screw 11 is formed; a nut 3 which has an inner peripheral screw 14 to be screwed to the outer peripheral screw 11 of the nozzle part 8, and a through-hole 15 formed to loosely fit a connection tube connected to the nozzle part 8; and an extension tube 4 integrally molded with the joint body 2, communicated with the flow path 12 of the joint body 2 and extended in a required length. A conventional first connection port s1 is configured by screwing the nut 3 to the nozzle part 8, and a second connection port s2 to be connected to another tube-connectable joint through the integrally molded extension tube 4 is configured.

Description

  The present invention relates to a tube joint and a joint unit for constructing a flow path of a fluid flowing between fluid devices such as pumps and valves in a semiconductor manufacturing process or chemical industry.

  In order to construct chemical piping in a semiconductor manufacturing process, a joint made of a fluororesin having excellent corrosion resistance is widely used. For example, in Patent Document 1, a threaded portion and a tube connecting portion are formed on both sides of a hollow joint body, a tube having an enlarged diameter is fitted into each tube connecting portion, and a nut penetrating the tube is screwed into each threaded portion. The joint structure which comprises two connection ports by combining is described.

JP 2009-115154 A

  When constructing chemical piping, when changing the flow path diameter and flow direction in a limited space, joints at very close distances or fluid equipment and joints are connected by tubes. In order to construct with the joint of Patent Document 1, both ends of a separately prepared tube must be connected to a joint or a joint of a fluid device because of its structure. And although the construction work which connects a tube to a joint is performed, construction in a narrow space is difficult to work and requires a lot of time. In addition, when constructing a tube between joints or between a joint and a fluid device, there is a problem that a relatively long connection space for tightening nuts on both sides of the tube is necessary, and the piping cannot be made compact.

  SUMMARY OF THE INVENTION In view of the above-described problems of the prior art, the present invention has an object to provide a tube joint and a joint unit that can perform construction work easily in a short time and that can construct a compact pipe. To do.

In order to achieve the above object, the following technical measures were taken.
That is, the tube joint of the present invention has a joint body in which a flow path is formed and a cylindrical mouth portion having an outer peripheral screw is formed, and an inner peripheral screw that is screwed to the outer peripheral screw of the cylindrical mouth portion. A nut formed with a through-hole for loosely fitting a connection tube connected to the portion, and an extended tube integrally formed with the joint body and extending to a required length connected to a flow path of the joint body. And the nut is screwed into the tube port portion to form a first connection port, and the extended tube forms a second connection port to be connected to another joint capable of tube connection. It is characterized by.

  In the tube joint of the present invention, the first connection port is configured by screwing a nut formed with a through hole for loosely fitting the connection tube into the tube port portion formed in the joint body, and the joint body and An extended tube that is integrally formed and extends for a required length communicating with the flow path of the joint body constitutes a second connection port that is connected to another joint that can be connected to the tube. That is, one of the connection ports of the tube joint is an extended tube extending from the joint body. Accordingly, when connecting tubes between very close distances or between a fluid device and the joint, it is not necessary to connect both ends of the separately prepared tube to the joint or the joint of the fluid device. In the tube joint of the present invention, the connection between the joints or between the joint and the fluid device is completed only by connecting the extended tube extending in the joint body to the other joint. For this reason, it is easy to perform work in construction in a narrow space, and the work time can be reduced. In addition, a long connection space for tightening the nuts on both sides of the tube is not required, and a compact pipe can be obtained.

  The channel diameters of the first connection port including the tube port part and the nut and the second connection port made of the extended tube are not limited, and they may be configured with different channel diameters. In this case, it can function as a conversion joint for the channel diameter.

  The number of each of the first connection port and the second connection port may be any number, and a plurality of first connection ports are configured, and the plurality of first connection ports are configured with different flow path diameters. There may be. In this case, for example, one of the plurality of first connection ports and the second connection port may be linearly communicated with the same channel diameter, and the other one first connection port may be branched in the other direction with a different channel diameter. it can.

  The seal structure of the first connection port is not limited as long as it includes a tube port portion and a nut. For example, a tube fitting portion is formed on the distal end side of the outer peripheral screw of the tube port portion, and the first connection port In this state, a high-hardness ring that is sandwiched between the distal end portion of the tube outer fitting portion and the nut and through which the connection tube passes is further provided, and the connection tube expands in the tube outer fitting portion. The diameter end portion is externally fitted, and the nut is screwed into the cylindrical mouth portion, so that the connection tube is pressed and sealed from the front and back between the high-hardness ring and the distal end portion of the tube external fitting portion. It is preferable.

  According to the seal structure described above, the nut can be reinforced by providing the high hardness ring on the inner side of the nut, and deformation of the nut can be prevented. Thereby, when the nut is tightened, the tube is pressed with an appropriate force to be well sealed, and at the same time, the connection port can be prevented from being loosened or detached due to pulling or shaking.

  The joint unit of the present invention has a branch body in which a branch channel is formed and a plurality of cylindrical mouth portions having outer peripheral screws, and inner peripheral screws that are screwed into the outer peripheral screws of the respective cylindrical mouth portions, A plurality of nuts formed with through holes for loosely inserting the connection tubes connected to the respective tube opening portions, and the respective nuts are screwed into the respective tube opening portions to form a plurality of connection ports. A branch joint and the tube joint, and by introducing an extended tube of the tube joint to at least one connection port of the branch joint and connecting the second connection port, The connection port is converted to a different flow path diameter.

  In the tube joint connected to the branch joint according to the present invention, the first connection port is configured by screwing a nut formed with a through hole for loosely fitting the connection tube into the tube port portion formed in the joint body. At the same time, an extended tube that is integrally formed with the joint body and communicated with the flow path of the joint body extends to a second connection port that is connected to another joint that can be connected to the tube. That is, one of the connection ports of the tube joint is an extended tube extending from the joint body. Therefore, when connecting the second connection port of the tube joint to the branch joint, it is not necessary to connect a separately prepared tube to the tube joint and the branch joint. The connection is completed simply by connecting the extended tube extending from the joint body to the branch joint. For this reason, it is easy to perform work in construction in a narrow space, and the work time can be reduced. In addition, a long connection space for tightening the nuts on both sides of the tube is not required, and a compact pipe can be obtained.

  On the other hand, when a pipe is constructed using a general branch joint having a plurality of flow path diameters, each connection port needs to be adapted to the pipe diameter of the connection tube. Therefore, many kinds of branch joints with different connection ports must be manufactured, which is a typical example of a small quantity and a wide variety, and hinders cost reduction. In particular, in the case of small-volume production, there are many cases in which there is no choice but to produce one product uniformly by cutting, which causes an increase in cost.

  In the joint unit of the present invention, an extended tube is directly introduced into at least one connection port of a branch joint in which a plurality of nuts are screwed into a plurality of tube port portions to form a plurality of connection ports, and the tube joint is directly connected. By connecting to each other, the channel diameter of the connection port of the branch joint is converted to a different channel diameter. Therefore, if a plurality of tube joints having different flow path diameters are manufactured, a branch flow path having a different diameter can be constructed by connecting them directly to the branch joint as appropriate. Thereby, the cost can be significantly reduced.

  The joint unit of the present invention has a joint body in which two branch ports having outer peripheral threads are formed, and an inner peripheral screw that is screwed to the outer peripheral screws of each of the cylindrical mouth parts, while forming a three-branch channel. , Two nuts in which through holes for loosely fitting the connection tubes connected to the respective cylinder port portions are formed, and are integrally formed with the joint main body and communicated with one of the three branch flow paths of the joint main body. And an extension tube extending at a required length, and the first connection ports are formed by screwing the nuts into the cylinder port portions, and the extension tubes are connected to the tubes. A plurality of tube joints constituting a second connection port connected to other possible joints, and the second connection port of any one of the plurality of tube joints is the second connection port of any other tube joint; Connected to one connection port, The tube fitting being connected directly and continuously, characterized in that the branch channel which branches or aggregating fluid is constituted.

  In the plurality of tube joints of the present invention, two first connection ports are configured by screwing each nut formed with a through hole for loosely fitting the connection tube into each tube port portion formed in the joint body. At the same time, an extended tube that is integrally formed with the joint main body and extends in a required length connected to the flow path of the joint main body constitutes a second connection port that is connected to another joint that can be connected to the tube. That is, one of the connection ports of the tube joint is an extended tube extending from the joint body. Therefore, when connecting with the 2nd connection port, it is not necessary to use the tube prepared separately. The connection is completed simply by connecting the extending tube extending to the joint body. For this reason, it is easy to perform work in construction in a narrow space, and the work time can be reduced. In addition, a long connection space for tightening the nuts on both sides of the tube is not required, and a compact pipe can be obtained.

  Furthermore, the second connection port of any one of the plurality of tube joints is connected to the first connection port of any other tube joint, and the plurality of tube joints are directly and continuously connected. A branch channel for branching or collecting the fluid is configured. Conventionally, there has been no choice but to configure the branch flow path with the cut manifold. However, in the joint unit of the present invention, the branch flow path is configured simply by directly connecting a plurality of tube joints. Thereby, the cost at the time of manufacturing a branch joint like a manifold can be reduced significantly.

  The sealing structure of the first and second connection ports is not limited as long as it includes a tube port portion and a nut. For example, a tube outer fitting portion is formed on the distal end side of the outer peripheral screw of each tube port portion, and In the state where the first and second connection ports are configured, a plurality of high-hardness rings that are sandwiched between the distal end portions of the respective tube outer fitting portions and the nuts and through which the connection tubes or the extension tubes pass are further provided. And each tube outer fitting portion is externally fitted with a diameter increasing end portion of a connection tube or an extended tube, and each nut portion is screwed to each tube mouth portion, and each of the high hardness rings and the It is preferable that the connection tube or the extended tube is pressed and sealed from the front and back between each tube outer fitting portion.

  According to the seal structure described above, the nut can be reinforced by providing the high hardness ring on the inner side of the nut, and deformation of the nut can be prevented. Thereby, when the nut is tightened, the tube is pressed with an appropriate force to be well sealed, and at the same time, the connection port can be prevented from being loosened or detached due to pulling or shaking.

  As described above, according to the present invention, the connection between the joint and between the joint and the fluid device is completed only by connecting the extension tube extending to the joint body to the other joint, so that the work is easy. Work time can be reduced. In addition, a long connection space for tightening the nuts on both sides of the tube is not required, and a compact pipe can be obtained.

It is sectional drawing which shows the tube coupling concerning 1st Embodiment of this invention. It is a disassembled perspective view which shows the use condition of the tube coupling of this embodiment. It is sectional drawing which showed an example which connects the extension tube of a 2nd connection port. It is sectional drawing which shows the tube coupling concerning 2nd Embodiment of this invention. It is sectional drawing which showed an example which connects the extension tube of a 2nd connection port. It is sectional drawing which shows the coupling unit concerning one Embodiment of this invention. It is sectional drawing which shows the coupling unit concerning one Embodiment of this invention. It is sectional drawing which shows the conventional manifold.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a tube joint 1 according to a first embodiment of the present invention. The tube joint 1 of this embodiment is used for the manufacturing process of semiconductors and the construction of chemical piping in the chemical industry. The joint body 2 in which a flow path is formed along the vertical direction in FIG. 2, a nut 3 that is integrally formed with the joint body 2, a high-hardness ring 5 that is provided on the inner side of the nut 3, and a control that is fitted on the lower side of the nut 3 in FIG. 1. It is mainly composed of the ring 6. In the following description, the side corresponding to the upper side of the tube joint 1 of FIG. 1 is the upper side, and the side corresponding to the lower side of FIG. 1 is the lower side.

  The joint body 2 of the present embodiment includes a base portion 7 formed with a required thickness and a tube opening portion 8 projecting upward from the base portion 7. In the present embodiment, the base 7 has a disk shape with a required thickness, but the shape and size of the base 7 are appropriately changed. The tube opening 8 is formed with a required length from the base 7, and includes a tube opening 9 and a tube fitting portion 10 formed on the distal end side of the tube opening 9. A male screw 11 as an outer peripheral screw is formed in the tube opening 9.

  The tube external fitting portion 10 is a portion into which a separate connection tube 30 is fitted and externally fitted, and is formed with a diameter smaller than that of the tube opening 9. A flow passage 12 through which a fluid passes is formed in the joint body 2, and the joint body 2 is hollow. The flow path 12 of the joint body 2 has the same diameter from the upper end to the lower end of the tube opening 8, and is expanded from the middle part of the base 7 to be expanded.

  The extended tube 4 extends downward from the joint body 2. The length of the extended tube 4 may be any length as long as the tube joint 1 of the present embodiment and other joints can be connected, and can be changed as appropriate. The flow path 13 of the extension tube 4 communicates with the flow path 12 of the joint body 2, and the pipe diameter is the expanded flow path diameter of the joint body 2. The tube diameter and the thickness of the extended tube 4 are, for example, 1/8 ", 1/4", 3/8 ", 1/2", 3/4 ", 1", etc., in the nominal diameter of the inch system. The nominal diameter of the metric system conforms to 3, 4, 6, 8, 10,.

  The nut 3 is formed in a cylindrical shape, and the nut 3 is formed with a female screw 14 as an inner peripheral screw that is screwed into the male screw 11 of the tube port 8. A through hole 15 is formed in the upper end portion 3 a of the nut 3 for loosely fitting the connection tube 30 fitted on the tube fitting portion 10. A plurality of protrusions 16 are formed on the lower end 3b of the nut 3 and are formed downward at predetermined intervals along the circumferential direction.

  A separate control ring 6 is provided between the nut 3 and the base portion 7. The control ring 6 is formed with a plurality of control portions 18 protruding outward in the radial direction. The high hardness ring 5 is formed so as to be able to penetrate the connection tube 30 and is sandwiched between the tip portion 10 a of the tube outer fitting portion 10 and the nut 3. The high hardness ring 5 is made of a material having higher hardness than the extension tube 4 and the connection tube 30, and is harder than the extension tube 4 and the connection tube 30. The high hardness ring 5 is formed with a pressing surface 5a inclined at a predetermined angle.

  FIG. 2 is an exploded perspective view showing a use state of the tube joint 1 of the present embodiment. First, the nut 3 and the high hardness ring 5 are fitted in the connection tube 30 in advance, and the diameter of the end of the connection tube 30 is increased while heating with a flare jig to obtain a diameter-expanded end 30a. The diameter-expanded end portion 30a is pushed into the tube outer fitting portion 10 of the tube opening portion 8 so as to be fitted. Then, when the nut 3 fitted in the connection tube 30 is put on the tube opening 8 of the joint body 2 and screwed together, each protrusion 16 of the nut 3 is circumferentially moved with the rotation of the nut 3. Proceed along. When the nut 3 is further rotated and tightened to a predetermined level, the plurality of protrusions 16 of the nut 3 start to contact the control ring 6.

  When the plurality of projections 16 come into contact with the control ring 6, each control unit 18 is pressed and deformed. However, each control unit 18 that is displaced from each projection 16 that continues to advance in the circumferential direction elastically returns to its original state. , It pops out between the adjacent protrusions 16. At this time, a repelling sound is generated to inform the degree of screwing between the nut 3 and the tube opening 8.

  If the nut 3 is continuously tightened as it is, the plurality of protrusions 16 come into contact with the base portion 7 of the joint body 2 to prevent the nut 3 from being excessively tightened. Thereby, damage to the nut 3 and the joint body 2 due to tightening of the nut 3 can be prevented. If the nut 3 continues to be tightened, the plurality of protrusions 16 are deformed, but the breakage remains in the plurality of protrusions 16, and the nut 3 and the joint body 2 are not damaged. Thereby, the nut 3 and the joint main body 2 can be protected.

  When the connection tube 30 is externally fitted to the tube external fitting portion 10 of the joint body 2 and the nut 3 is screwed together, as the nut 3 is tightened, the high hardness ring 5 and the distal end portion 10a of the tube external fitting portion 10 are obtained. The connecting tube 30 is pressed from the front and back. The surface of the connection tube 30 is pressed by the pressing surface 5 a of the high hardness ring 5, and the back surface is pressed by the distal end portion 10 a of the tube outer fitting portion 10. Thereby, the seal structure of the tube joint 1 is obtained, and the leakage of the fluid flowing through the flow path of the connection tube 30 and the tube joint 1 can be reliably stopped.

  The 1st connection port s1 of the tube coupling 1 is comprised as mentioned above. The extended tube 4 of the tube joint 1 constitutes a second connection port s2 as the second connection port of the tube joint 1. The extended tube 4 is connected to another joint that can be connected to the tube, and any form may be used for connecting the extended tube 4. For example, the joint having the form of the first connection port s1 described above can be connected to the extended tube 4.

  FIG. 3 is a cross-sectional view showing an example of connecting the extended tube 4 of the second connection port s2. The seal structure of the present embodiment for connecting the extended tube 4 of the second connection port s2 is the same as that of the first connection port s1, but any seal structure can be used as long as the extended tube 4 is connected. There may be. In the illustrated seal structure, the end of the extension tube 4 is heated by a flare jig to expand the diameter, as in the first connection port s1, and the expanded end 4a is fitted into another cylindrical port not shown. What is necessary is just to screw the nut 19 in the state which pinched | interposed the high hardness ring 17. FIG.

  The joint body 2 including the extending tube 4 and the nut 3 used in the present embodiment are formed by using, for example, an injection molding method using PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer). It is. The fluororesin used to form the joint body 2 and the nut 3 is not limited to PFA, but PTFE (polytetrafluoroethylene), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), ethylene / tetrafluoroethylene copolymer Known resins such as coalescence (ETFE), polychlorotrifluoroethylene (PCTFE), ethylene / chlorotrifluoroethylene copolymer (ECTFE), and polyvinylidene fluoride (PVDF) may be used.

  The joint body 2 and the nut 3 may be formed using a known resin material other than the fluororesin. Examples of the resin material to be used include olefin resins such as polyethylene, polypropylene, and polybuden, amide resins such as 6 nylon, 66 nylon, 11 nylon, and 12 nylon, and vinyl resins such as vinyl chloride resin. In selecting these materials, in addition to the type of fluid flowing in the flow path, the temperature of the fluid, elution, the ambient temperature environment, etc., it should be considered in conjunction with fluid equipment such as pumps and valves used together. That's fine.

  The high hardness ring 5 formed of a material having a hardness higher than that of the extension tube 4 and the connection tube 30 is made of PVDF having a hardness higher than that, since the extension tube 4 of the present embodiment is formed of PFA. Is formed. The material for forming the high-hardness ring 5 and the control ring 6 is not limited, and may be any of the various fluororesins described above or a known resin other than the fluororesin as long as the required characteristics are satisfied. By configuring the high hardness ring 5 and the control ring 6 with a material that is cheaper than the joint body 2 and the nut 3, it is possible to reduce the manufacturing cost.

  In the tube joint 1 of the present embodiment, the first connection port s1 is formed by screwing the nut 3 formed with the through hole 15 into which the connection tube 30 is loosely fitted into the tube port 8 formed in the joint body 2. The second connection port s2 is configured to be connected to another joint that can be connected to the extended tube 4 that is integrally formed with the joint body 2 and extends for a required length communicated with the flow path 12 of the joint body 2. Configure. That is, one of the connection ports of the tube joint 1 includes an extended tube 4 that extends to the joint body 2.

  In the case of a conventional joint, a connection structure for sealing by screwing a nut, for example, is provided at a place where the extended tube 4 exists. For example, when connecting a connection tube between a fluid device and a joint, the connection work is performed on the fluid device side and the connection work is also performed on the joint side. This connection work is a work of sealing by screwing a nut, for example. In the tube joint 1 of the present embodiment, the extension tube 4 is directly formed on the joint body 2, so that the connection work is completed by connecting the extension tube 4 to another joint. 1 can be constructed.

  Therefore, when connecting joints or fluid equipment and joints with tubes, there is no need to connect both ends of separately prepared tubes to joints or joints of fluid equipment. Therefore, the number of work steps can be reduced, the work time can be reduced, and the construction work can be easily performed even in a narrow space. In addition, a long connection space for tightening the nuts on both sides of the tube is not required, and a compact pipe can be obtained.

  The present invention is not limited to the above embodiment, and the first connection port s1 may be configured with another seal structure, or the extended tube 4 of the second connection port s2 may be connected with another seal structure. Two or more first connection ports can be configured, or two or more second connection ports composed of the extended tubes 4 can be configured. Furthermore, you may comprise a 1st connection port and a 2nd connection port by a mutually different flow path diameter, respectively.

  FIG. 4 is a cross-sectional view showing a tube joint 20 according to the second embodiment of the present invention, and FIG. 5 is a cross-sectional view showing an example of connecting the extended tube 25 of the second connection port s2. Unless otherwise specified, the same reference numerals are given to the structural members corresponding to the structural members of the first embodiment. The tube joint 20 of the present embodiment includes a joint body 23 in which a three-branch channel 21 is formed and two tube port portions 8 and 8 are formed, and two nuts 3 and 3 that are screwed into the tube port portions 8. In addition, each high hardness ring 5 provided on the inner side of each nut 3, each control ring 6 fitted in each tube opening 8, and one flow path 21 a and a straight line among the three branch flow paths 21 of the joint body 23. It is mainly composed of an extended tube 25 extending in a required length that is communicated with each other.

  In this tube joint 20, two nuts 3 are screwed into the two tube ports 8, 8, whereby two first connection ports s 1, s 1 are formed, and the extension tube 25 can be connected to the other tube. A second connection port s2 connected to the joint is configured. The configuration of each connection port other than the joint body 23 is the same as that in the first embodiment. In the present embodiment, the two first connection ports s1 and s1 are configured with different flow path diameters, and the flow path diameter of the flow path 21b along the vertical direction in FIG. It is smaller than the channel diameter of the channel 21a. The first connection port s1 on the large diameter side and the second connection port s2 communicate linearly with the same channel diameter, and the other first connection port s1 branches upward with a different channel diameter. Also in this tube joint 20, the same effect as the tube joint 1 of 1st Embodiment can be acquired.

  FIG. 6 is a cross-sectional view showing a joint unit 35 according to an embodiment of the present invention. The joint unit 35 of the present embodiment is composed of a union type joint (hereinafter referred to as a UT joint) 36 as a branch joint having a three-branch flow path and the tube joint 1 of the above-described embodiment connected thereto. . Any number of tube joints 1 may be connected to the UT joint 36. In this embodiment, an example in which one tube joint 1 is connected will be described.

  The UT joint 36 of the present embodiment is a well-known one, and a branch body 40 in which three branch channels having the same channel diameter are formed and three cylindrical port portions 37, 37, 37 having outer peripheral screws are formed. Each nut 41 has an inner peripheral screw threadedly engaged with an outer peripheral screw of each tube opening 37, each nut 41 for loosely inserting the connection tube 30 connected to each tube opening 37, and provided inside each nut 41. Each high hardness ring 42 and each control ring 43 that controls the rotation of each nut 41 are mainly configured.

  Each nut 41 is screwed into each tube port portion 37 of the UT joint 36, and three connection ports 44 having the same form as the first connection port s1 of the first embodiment are configured. By connecting the connection tube 30 or the like to each connection port 44, for example, the fluid flowing into one connection port 44 can be branched toward the other two connection ports 44, 44.

  The tube joint 1 of the first embodiment is directly connected to the connection port 44 on the upper side in FIG. 6 of the UT joint 36. A nut 41 and a high-hardness ring 42 are passed through the extended tube 4 of the tube joint 1, and the end of the extended tube 4 is expanded in diameter to form an expanded end 4 a. Then, the enlarged diameter end portion 4a of the extended tube 4 of the tube joint 1 is externally fitted into the tube fitting portion 47 of the tube mouth portion 37, and the nut 41 is inserted into the tube mouth portion 37 with the high hardness ring 42 sandwiched therebetween. Screw in and tighten. Thereby, the tube joint 1 is connected to the connection port 44 of the UT joint 36.

  The flow path diameter d1 of the tube joint 1 is smaller than the flow path diameter d2 of the UT joint 36. By connecting the tube joint 1 to the connection port 44 of the UT joint 36, the flow channel diameter d2 of the connection port 44 is converted to a small flow channel diameter d1. That is, by connecting the tube joint 1 to the connection port 44 of the UT joint 36, the connection port 44 is converted to a different flow path diameter.

  The joint unit 35 of this embodiment shows an example of the present invention, and the flow path diameter and the seal structure of the UT joint 36 and the tube joint 1 are not limited. The tube joint 1 may be connected to any connection port of the UT joint 36, and the number of tube joints 1 to be connected is not limited. For example, the channel diameter of the tube joint may be converted to a larger channel diameter by connecting the tube joint to the UT joint by making the channel diameter of the tube joint larger than the channel diameter of the UT joint. Two or three tube joints 1 may be connected to the UT joint to form a joint unit having two different flow path diameters or three different flow path diameters.

  Furthermore, in the present embodiment, an example of a UT joint is shown, but the present invention may be applied to a branch joint having another form, or may be applied to other branch joints formed with a plurality of different flow path diameters. Thus, the present invention can be applied in various forms.

  In the tube joint 1 connected to the UT joint 36 in the present embodiment, the first connection port s1 is configured by screwing the nut 3 into the tube port portion 8 formed in the joint body 2, and the joint body 2 and The integrally formed extended tube 4 constitutes a second connection port s2 connected to another joint that can be connected to the tube. That is, one of the connection ports of the tube joint 1 includes an extended tube 4 that extends to the joint body 2. Accordingly, when connecting the second connection port s2 of the tube joint 1 to the UT joint 36, it is not necessary to connect the tube joint 1 and the UT joint 36 with a separately prepared tube. The connection is completed simply by connecting the extended tube 4 extended to the joint body 2 to the UT joint 36. For this reason, it is easy to perform work in construction in a narrow space, and the work time can be reduced. In addition, a long connection space for tightening the nuts on both sides of the tube is not required, and a compact pipe can be obtained.

  On the other hand, when a pipe is constructed using a general branch joint in which a plurality of flow path diameters are configured, it is necessary to adapt each connection port to the diameter of the tube connected to the connection partner. Therefore, many types of branch joints with different connection ports have to be manufactured, which is a typical example of a small amount and a wide variety, and hinders cost reduction. In particular, in the case of small-volume production, there are many cases in which there is no choice but to produce one product uniformly by cutting, which causes an increase in cost.

  In the joint unit 35 of the present embodiment, the tube joint 1 is directly connected by introducing the extended tube 4 to at least one or more connection ports (one connection port 44 in the present embodiment) of the UT joint 36. Thus, the flow path diameter d2 of the connection port 44 of the UT joint 36 is converted to a different flow path diameter d1. Therefore, if a plurality of tube joints having different flow path diameters are manufactured, these are appropriately connected directly to a branch joint having a connection port having the same flow path diameter, so that branch flow paths having different diameters can be obtained. Can be built. Thereby, the cost can be significantly reduced.

  In particular, in recent years, there has been a demand for the development of a joint having a flow path diameter of 2 ″, which requires a huge mold cost. Therefore, without using a new mold, It is important to spread the 2 "joint from the 2" joint to the smaller flow path diameter. In this regard, the tube joint of the first embodiment and the second embodiment is 2 ". By connecting directly to the joint, a joint unit having a flow path diameter of 2 ″ can be provided at low cost.

  FIG. 7 is a cross-sectional view showing a joint unit 50 according to an embodiment of the present invention. The joint unit 50 of the present embodiment includes a reducing union elbow type joint (hereinafter referred to as RUE joint) 53 having large and small connection ports 51 and 52 of the same form as the first connection port s1 of the first embodiment. It is comprised with the tube couplings 20 and 20 of 2nd Embodiment connected.

  In these tube joints 20 and 20, as described above, the nut 3 is screwed into the two cylindrical port portions 8 and 8 to form two first connection ports s 1, and the extended tube 25 is connected to the tube. The 2nd connection port s2 connected to the other possible joint is comprised. The extended tube 25 of the tube joint 20 is directly connected to the large-diameter side connection port 51 of the two connection ports 51 and 52 of the RUE joint 53, and the large-diameter side first connection port of the tube joint 20. The extension tube 25 of the other tube joint 20 is directly connected to s1.

  Accordingly, the joint unit 50 includes, in order from the left side in FIG. 7, the small-diameter side connection port 52 of the RUE joint 53, the small-diameter side first connection port s 1, and the small-diameter side of the tube joint 20. A first connection port s1 and a first connection port s1 on the larger diameter side of the tube joint 20 are configured. By connecting these three joints sequentially and sequentially, the joint unit 50 includes a main flow path 54 having a larger flow path diameter and three sub-flow paths 55 having a smaller flow path diameter. .

  The main flow path 54 of the joint unit 50 extends from the first connection port s1 at the right end of FIG. 7 to the RUE joint, and the three sub flow paths 55 branch from the main flow path 54 upward in FIG. . Therefore, the fluid flowing through the main flow channel 54 can be divided into three sub flow channels 55 to flow. By the joint unit 50 of the present embodiment, it is possible to configure a branch channel that branches or aggregates fluids.

  Conventionally, a manifold 60 shown in FIG. 8 is known as having the above-described branch flow path. The manifold 60 has five connection ports 61 to 65, and these connection ports 61 to 65 must be adapted to various connection tube diameters. Therefore, it is necessary to manufacture a single manifold 60 according to the piping specifications. For example, the main body of the manifold 60 is manufactured by cutting from a block molded product of PTFE, which requires a great deal of cost. Therefore, in the joint unit 50 of the present embodiment, an equivalent product to the conventional manifold can be manufactured only by combining the tube joint 20 of the second embodiment with the conventional joint. Thereby, the cost at the time of manufacturing a branch joint like a manifold can be reduced significantly.

  Each of the above embodiments exemplifies a tube joint and a joint unit according to the present invention. The tube joint of the present invention can be configured in various forms by replacing the connection port of the conventional joint with an extended tube. Various joint units can be configured by combining the conventional joint and the tube joint of the present invention.

1, 20 Tube joint 2, 23 Joint body 3, 19, 41 Nut 4, 25 Extended tube 4a Expanded end 5, 17, 42 High-hardness ring 6, 43 Control ring 7 Base 8, 37 Cylinder opening 10, 47 Tube fitting part 12 Flow path 13 Flow path 15 Through hole 16 Protrusion 18 Control part 21 3 branch flow path 30 Connection tube 30a Expanded end 35, 50 Joint unit 36 UT joint 53 RUE joint 54 Main flow path 55 Sub stream Path 60 Manifold s1 First connection port s2 Second connection port

Claims (7)

A joint body in which a flow path is formed and a cylindrical mouth portion having an outer peripheral screw is formed;
A nut having an inner peripheral screw that is screwed to an outer peripheral screw of the tube opening portion, and a through-hole for loosely fitting a connection tube connected to the tube opening portion;
An extended tube that is integrally formed with the joint body and communicates with a flow path of the joint body, and extends for a required length.
The nut is screwed into the tube port portion to form a first connection port,
A tube joint characterized in that the extended tube constitutes a second connection port connected to another joint to which the tube can be connected.   The tube joint according to claim 1, wherein the first connection port and the second connection port are configured with different flow path diameters.   2. The tube joint according to claim 1, wherein a plurality of the first connection ports are configured, and the plurality of first connection ports are configured with different flow path diameters. A tube outer fitting portion is formed on the distal end side of the outer peripheral screw of the cylindrical mouth portion,
In the state where the first connection port is configured, a high-hardness ring is further provided that is sandwiched between the distal end portion of the tube outer fitting portion and the nut and through which the connection tube passes,
The diameter expansion end portion of the connection tube is externally fitted to the tube external fitting portion, and the nut is screwed to the tube opening portion,
The tube joint according to any one of claims 1 to 3, wherein a connection tube is pressed and sealed from the front and back between the high hardness ring and a tip portion of the tube fitting portion. A branch body in which a branch channel is formed and a plurality of cylindrical mouth portions having outer peripheral screws are formed;
A plurality of nuts each having an inner peripheral screw that is screwed to an outer peripheral screw of each of the tube port portions, and a plurality of nuts formed with through holes for loosely inserting connection tubes connected to the respective tube port portions;
A branch joint in which each of the nuts is screwed to each of the tube opening portions to form a plurality of connection ports;
A tube coupling according to claim 1,
By introducing an extended tube of the tube joint to at least one connection port of the branch joint and connecting the second connection port, the connection port of the branch joint is converted to a different flow path diameter. Features a joint unit. A joint body in which a three-branch channel is formed and two cylindrical mouth portions having outer peripheral screws are formed;
Two nuts each having an inner peripheral screw that is screwed to an outer peripheral screw of each of the tube opening portions, and having a through hole for loosely fitting a connection tube connected to each of the tube opening portions;
An extended tube that is integrally formed with the joint body and that extends in a required length and communicates with one of the three branch passages of the joint body,
The nuts are screwed into the tube port portions to form two first connection ports,
A plurality of tube joints constituting a second connection port to which the extended tube is connected to another joint capable of tube connection;
A second connection port of any one of the plurality of tube joints is connected to a first connection port of any one of the other tube joints, and the plurality of tube joints are directly and continuously connected to each other. A joint unit characterized by comprising a branch flow path for branching or consolidating the two. A tube outer fitting portion is formed on the distal end side of the outer peripheral screw of each cylindrical mouth portion,
In the state in which the first and second connection ports are configured, a plurality of high-hardness rings that are sandwiched between the distal end portions of the tube outer fitting portions and the nuts and through which the connection tubes or the extension tubes pass are further provided. Provided,
Each tube outer fitting portion is externally fitted with a connection tube or an extended diameter end portion of the extending tube, and each nut is screwed into each tube opening portion.
7. The joint unit according to claim 5, wherein the connection tube or the extension tube is pressed and sealed from the front and back between each of the high hardness rings and the distal end portion of each of the tube fitting portions.

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