Joint

Abstract

To provide a joint which can be used with a liquid which does not allow contact with materials other than resin and secure electric conduction of a connection object including a tube.SOLUTION: A joint 10 connects elastic tubes 7 for feeding a liquid. The joint 10 has: a metal joint main part 12 having a connection cylinder part 13 on which the elastic tubes 7 are fitted; a resin layer 17 provided on an inner surface 14 of the joint main part 12 including the connection cylinder part 13; and a clamp 19 for fastening the tube 7 to the connection cylinder part 13.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a joint. [Background technology]

[0002] Cited Document 1 discloses an inkjet coating device. The inkjet coating device has a tank for storing liquid (ink), an inkjet head, and a liquid supply pipe connecting the tank and the inkjet head. In addition to a tube for supplying the liquid, the liquid supply pipe has a joint for connecting the tube. Liquid transfer pipes including joints are used in a variety of devices, for example, in devices for manufacturing electronic components such as semiconductors, or in devices for producing chemicals. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-144386 Summary of the Invention [Problem to be solved by the invention]

[0004] For special applications, there are liquids that cannot come into contact with anything other than resin (e.g., fluororesin). For this reason, resin tubes are used for the liquid supply piping. It is inappropriate to use metal joints to connect these tubes. Therefore, it is considered to use resin joints.

[0005] In liquid transport piping, it is sometimes necessary to consider electrical influences such as flow electrification. For this reason, tubes with conductive sections along their length (conductive PFA tubes) are known. For example, when two such tubes are connected via a joint, electrical continuity is interrupted if the joint is made of resin.

[0006] Therefore, an object of the present invention is to provide a joint that can be used with liquids that cannot come into contact with anything other than resin, and that can ensure electrical conductivity of connected objects, including tubes. [Means for solving the problem]

[0007] The joint of the present invention is a joint for connecting an elastic tube for conveying liquid, and comprises a metal joint body having a connecting tubular portion into which the elastic tube is fitted, a resin layer provided on the inner surface of the joint body including the connecting tubular portion, and a clamp for tightening the elastic tube to the connecting tubular portion. [Effects of the Invention]

[0008] The joint of the present invention can be used with liquids that cannot come into contact with other than resin, and can also ensure electrical continuity of connected objects including tubes. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram of a coating device in which the joint of the present invention is employed. [Figure 2] FIG. 2 is a perspective view showing an example of the joint of the present invention. [Figure 3] FIG. 3 is a cross-sectional view of the joint shown in FIG. [Figure 4] FIG. 4 is an explanatory diagram of an elastic tube. [Figure 5] FIG. 5 is a perspective view showing a modified example of the outer surface of the connecting tube portion. [Figure 6] FIG. 6 is an explanatory diagram of the clamp as viewed from the axial direction of the joint. [Figure 7] FIG. 7 is a perspective view showing another type of joint. [Figure 8] FIG. 8 is a cross-sectional view of the joint shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] <Outline of the embodiment of the present invention> Hereinafter, an outline of an embodiment of the present invention will be listed and described. (1) The present invention is a joint for connecting an elastic tube for conveying liquid, comprising a metal joint body having a connecting tubular portion into which the elastic tube is fitted, a resin layer provided on the inner surface of the joint body including the connecting tubular portion, and a clamp for tightening the elastic tube to the connecting tubular portion.

[0011] Even if the joint body is made of metal, a resin layer is provided on the inner surface of the joint body that comes into contact with the liquid, so the joint can be used even if the liquid flowing through the elastic tube and joint is a liquid that cannot come into contact with anything other than resin. The joint body having the connecting tubular portion is made of metal. Therefore, if the elastic tube fitted onto the connecting tubular portion has a conductive portion at least on its inner periphery, it is possible to ensure electrical conduction between the elastic tube and another member (e.g., another elastic tube) connected via the joint.

[0012] (2) In the joint of (1), the elastic tube has a conductive portion at least on its inner periphery, and at least a part of the outer surface of the connecting tube portion is an exposed surface that can come into direct contact with the conductive portion. The inner surface of the joint body, including the connecting tubular portion, is covered with a resin layer, but at least a portion of the outer surface of the connecting tubular portion is exposed and not covered with the resin layer. The conductive portion of the elastic tube comes into contact with this exposed surface. This ensures electrical continuity between the elastic tube and another component (e.g., another elastic tube) connected via the joint.

[0013] (3) In the joint of (1) or (2), the resin layer is further provided on an end surface of the connecting tube portion that is connected to the inner surface and on a part of the outer surface that is connected to the end surface. The resin layer configuration ensures that the liquid does not come into direct contact with the metal joint body. The resin layer extends from the inner surface of the joint body (the cylindrical connection part) through the end face of the cylindrical connection part to a part of its outer surface, increasing the bonding strength of the resin layer to the joint body.

[0014] (4) In the joint of (2) above, the outer surface of the connecting tubular portion is a straight tubular shape. Compared to a case where the connecting cylindrical portion has a cylindrical shape with an uneven outer surface, the conductive performance between the connecting cylindrical portion and the elastic tube having a conductive portion on the inner periphery is high.

[0015] (5) In any one of the joints (1) to (4), the clamp has an arc portion having an arc-shaped fastening surface that covers all but a portion of the connecting tube portion in the circumferential direction, a first arm portion extending from a first circumferential end of the arc portion, a second arm portion extending from a second circumferential end of the arc portion, and a retaining member that restrains the first arm portion and the second arm portion in a state where they are close to each other. According to the above configuration, the elastic tube is fitted onto the connecting tubular portion, and the arc portion of the clamp is attached to the outer periphery of the elastic tube. The first arm portion and the second arm portion extending from the arc portion are brought close to each other, and the retaining member restrains them in this state, thereby clamping the elastic tube to the connecting tubular portion.

[0016] (6) In the joint of (5), the arc portion has a first shell portion located circumferentially opposite the circumferential part of the connecting tube portion, and a second shell portion and a third shell portion connected to adjacent ones of the first shell portion on both circumferential sides, and at least one of the second shell portion and the third shell portion includes a portion that is thinner than the first shell portion. According to this configuration, when the first arm portion and the second arm portion are brought closer to each other, the arc portion is likely to be elastically deformed at the thin-walled portion, making it possible to increase the tightening force.

[0017] <Details of the embodiment of the present invention> Hereinafter, the details of the embodiments of the present invention will be described. [Devices in which the joint of the present invention is used] For example, a coating device such as an inkjet coating device (see FIG. 1) has a tank 81 that stores liquid (ink), a coating head 82, and a liquid supply pipe 83 that connects the tank 81 and the coating head 82. The liquid in the tank 81 is sent to the coating head 82 through the liquid supply pipe 83. While the coating head 82 and the substrate 90 move relative to each other, the coating head 82 ejects the liquid onto the substrate 90. In this way, the liquid is applied to the substrate 90.

[0018] The liquid supply pipe 83 as described above has a joint 10 for connecting the tube 7 in addition to the tube 7 for supplying the liquid. The joint of the present invention is used as the joint 10 of the liquid supply pipe 83 described above. The liquid supply pipe including the joint of the present invention is used in various devices, for example, in devices for manufacturing electronic components such as semiconductors, or devices for producing chemicals.

[0019] [About Joint 10] Fig. 2 is a perspective view showing an example of a joint of the present invention. Fig. 3 is a cross-sectional view of the joint shown in Fig. 2. The joint 10 shown in Figs. 2 and 3 is a straight type. The joint 10 connects to a tube 7 for conveying a liquid. The tube 7 is elastic, and hereinafter, this tube 7 will be referred to as an "elastic tube 7." Fig. 2 shows the elastic tube 7 with a virtual line (two-dot chain line).

[0020] When the elastic tube 7 is connected to the joint 10, the center line of the elastic tube 7 coincides with the center line of the joint 10. The direction along this center line and the direction parallel to this center line are referred to as the "axial direction" of the joint 10.

[0021] The elastic tube 7 and the liquid delivered by the elastic tube 7 will now be described. The liquid is a liquid that cannot come into contact with anything other than resin. Therefore, the elastic tube 7 is made of resin. The elastic tube 7 in this embodiment is made of fluororesin. Fig. 4 is an explanatory diagram of an elastic tube 7. In addition to a tube body 9 made of resin, the elastic tube 7 shown in Fig. 4 has conductive parts 8 provided on both the outer and inner circumferences of the tube body 9, and a conductive part 8 connecting the outer conductive part 8 and the inner conductive part 8.

[0022] The elastic tube 7 is, for example, a conductive PFA (perfluoroalkoxyalkane) tube. The conductive portion 8 is provided over the entire length of the elastic tube 7 in the longitudinal direction. The elastic tube 7 has the conductive portion 8 to prevent flow electrification. In this embodiment, it is sufficient that the elastic tube 7 has the conductive portion 8 at least on its inner periphery.

[0023] The joint 10 (see FIGS. 2 and 3) has a metal joint body 12, a resin layer 17, and two metal clamps 19. The joint body 12 has a straight cylindrical connecting tubular portion 13. An end portion 71 of the elastic tube 7 fits onto the connecting tubular portion 13. The joint body 12 of this embodiment has a straight shape and has connecting tubular portions 13 on both sides in the axial direction. An elastic tube 7 is connected to each of the two connecting tubular portions 13.

[0024] The joint body 12 (see Figure 3) has a central block 15 located between the two connecting cylindrical portions 13. The central block 15 has an inner surface 152 on its inner periphery that has the same diameter as the inner surface 31 of the connecting cylindrical portion 13, and an annular protrusion 151 that protrudes radially on its outer periphery. The protrusion 151 can come into contact with the elastic tube 7 that fits over the connecting cylindrical portion 13, and functions as a positioning portion for the elastic tube 7.

[0025] A linear hole through which liquid passes is formed by the inner surfaces 31 of the two connecting cylindrical portions 13 and the inner surface 152 of the center block 15. These inner surfaces 31 and 152 form the inner surface 14 of the joint body 12. The connecting tubular portion 13 has an inner surface 31 that is a straight tubular shape, an end surface 32 that is connected to the inner surface 31 , and an outer surface 33 that is connected to the end surface 32 .

[0026] The inner diameter of the connecting tubular portion 13 is the same as the inner diameter of the elastic tube 7. The elastic tube 7 is fitted onto the outside of the connecting tubular portion 13 by elastically deforming in the direction of expanding its diameter. The outer surface 33 of the connecting tubular portion 13 in this embodiment is a straight tubular shape with no irregularities. Fig. 5 is a perspective view showing a modified example of the outer surface 33 of the connecting tubular portion 13. The outer surface 33 of the connecting tubular portion 13 may have an irregular shape.

[0027] The resin layer 17 (see FIG. 3) is provided on the inner surface 14 of the joint body 12 including the connecting tubular portions 13. The resin layer 17 is formed by a resin coating provided on the inner surface 14 of the joint body 12. The resin layer 17 is non-conductive. The resin used for the resin layer 17 is, for example, a fluorine-based resin. The resin layer 17 is provided continuously (without gaps) on the inner surfaces 31 of the two connecting tubular portions 13 and the inner surface 152 of the center block 15.

[0028] In each connecting tubular portion 13, the resin layer 17 is provided not only on the inner surface 31 but also on the end surface 32 connected to the inner surface 31 and on a portion of the outer surface 33 connected to the end surface 32. The resin layer 17 is provided not on the entire outer surface 33 of the connecting tubular portion 13, but on a portion on the side of the center block 15. In other words, at least a portion of the outer surface 33 of the connecting tubular portion 13 is an exposed surface 34 where the metal portion is exposed. The conductive portion 8 of the elastic tube 7 can directly come into contact with this exposed surface 34. With this configuration, the elastic tube 7 and the joint body 12 are electrically connected.

[0029] 3, the resin layer 17 is provided on half of the outer surface 33 of the connecting tubular portion 13 in the axial direction, and the remaining half is the exposed surface 34. The ratio of the resin layer 17 to the exposed surface 34 on the outer surface 33 can be changed. However, the conductive portion 8 of the end 71 of the elastic tube 7 must be in direct contact with the exposed surface 34.

[0030] The clamp 19 is a separate member from the joint body 12. The clamp 19 is a member for fastening the end 71 of the elastic tube 7 to the connecting tubular portion 13. Figure 6 is an explanatory diagram of the clamp 19 as seen from the axial direction of the joint 10. As shown in FIGS. 2 and 6, the clamp 19 has an arcuate portion 20, a first arm portion 21, a second arm portion 22, and a stopper member 23.

[0031] The arc portion 20 has an arc-shaped fastening surface 203 that covers all but a circumferential portion 131 (see FIG. 6 ) of the connecting tube portion 13. The first arm portion 21 extends from a first circumferential end portion 201 of the arc portion 20. The second arm portion 22 extends from a second circumferential end portion 202 of the arc portion 20. The arc portion 20, the first arm portion 21, and the second arm portion 22 are formed from a single common metal member.

[0032] The retaining member 23 is a member that restrains the first arm portion 21 and the second arm portion 22 in a state where they are close to each other. The retaining member 23 is a bolt, and in the form shown in Fig. 2, it is a hexagon socket head bolt. The retaining member 23, which is a bolt, has a shaft portion 231 with a threaded portion and a head portion 232 that has a larger outline than the shaft portion 231. Note that the retaining member 23 may be something other than a bolt (hexagon socket head bolt). The first arm portion 21 is provided with a through hole 211 through which the shaft portion 231 passes, and the second arm portion 22 is provided with a screw hole 221 into which the screw portion of the shaft portion 231 engages. The through hole 211 and the screw hole 221 are holes that are oriented perpendicular to an imaginary straight line L that is parallel to the axial direction of the arc portion 20. Therefore, the shaft portion 231 is inserted through the through hole 211 in a direction that is perpendicular to the imaginary straight line L. This configuration allows the space required for the tightening operation of the clamp 19 to be reduced.

[0033] A gap is provided between the first arm 21 and the second arm portion 22. The gap is narrowed by tightening the retaining member 23, which is a bolt, into the threaded hole 221. As a result, the fastening surface 203 of the arc portion 20 comes into close contact with the outer peripheral surface of the elastic tube 7 fitted onto the connecting tubular portion 13, and the elastic tube 7 is fastened to the connecting tubular portion 13. As a result, the elastic tube 7 is prevented from falling off the joint 10.

[0034] As described above, with the elastic tube 7 fitted onto the connecting tubular portion 13, the arc portion 20 of the clamp 19 is attached to the outer periphery of the elastic tube 8. The clamp 19 is elastically deformed to bring the first arm portion 21 and the second arm portion 22 extending from the arc portion 20 closer to each other. In this state, the retaining member 23 restrains the first arm portion 21 and the second arm portion 22, thereby tightening the elastic tube 7 to the connecting tubular portion 13. This brings the elastic tube 7 into a connected state to the joint 10.

[0035] In this embodiment (see FIG. 3), the clamp 19 is located within the axial range of the connecting tubular portion 13. In other words, the axial dimension of the clamp 19 is smaller than the axial dimension of the connecting tubular portion 13. Furthermore, the retaining member 23 is a bolt, and the retaining member 23 can be easily tightened with a tool. In this embodiment, the clamp 19 can be made compact, and the clamp 19 can be easily attached to the joint body 12. Furthermore, the work can be carried out even if the space for the work is narrow.

[0036] 6, the arc portion 20 has a first shell portion 26, a second shell portion 27, and a third shell portion 28. The first shell portion 26 is a portion located circumferentially opposite the circumferential portion 131 of the connecting tubular portion 13. The second shell portion 27 and the third shell portion 28 are portions connected to adjacent portions on both circumferential sides of the first shell portion 26. In this embodiment, the second shell portion 27 includes a portion 271 that is thinner than the first shell portion 26 , and the third shell portion 28 includes a portion 281 that is thinner than the first shell portion 26 .

[0037] According to this configuration of clamp 19, when first arm portion 21 and second arm portion 22 are brought closer to each other, arc portion 20 is likely to elastically deform at thin-walled portions 271, 281. This makes it possible to increase the tightening force of clamp 19 by stop member 23. It is sufficient that at least one of the second shell portion 27 and the third shell portion 28 includes a portion that is thinner than the first shell portion 26 .

[0038] [Another type of joint 10] Fig. 7 is a perspective view showing another form of joint 10. Fig. 8 is a cross-sectional view of the joint 10 shown in Fig. 7. The joint 10 shown in Figs. 7 and 8 is T-shaped. The joint 10 has a metal joint body 12, a resin layer 17, and a metal clamp 19. The joint body 12 has three straight cylindrical connecting tubular portions 13. The end portions 71 of the elastic tube 7 fit onto the three connecting tubular portions 13, respectively. The inner diameters of the multiple connecting tubular portions 13 may be different or the same.

[0039] The joint body 12 has a central block 15 located between the three connecting cylindrical portions 13. The inner surfaces 31 of the three connecting cylindrical portions 13 and the inner surface 152 of the central block 15 form a T-shaped flow path through which liquid passes. These inner surfaces 31 and 152 form the inner surface 14 of the joint body 12. The connecting tubular portion 13 has an inner surface 31 that is a straight tube shape, an end surface 32 that is connected to the inner surface 31, and an outer surface 33 that is connected to the end surface 32. The configuration of the connecting tubular portion 13 is the same as the configuration of the connecting tubular portion 13 of the embodiment shown in Figures 2 and 3.

[0040] The resin layer 17 is provided on the inner surface 14 of the joint body 12 including the connecting tubular portions 13. The resin layer 17 is the same as the resin layer 17 shown in Figures 2 and 3 and is, for example, fluorine-based. The resin layer 17 is provided continuously (without gaps) on the inner surfaces 31 of the three connecting tubular portions 13 and the inner surface 152 of the center block 15.

[0041] 2 and 3, the resin layer 17 shown in Figures 7 and 8 is provided on the inner surface 31 of each connecting tubular portion 13, as well as on an end surface 32 connected to the inner surface 31 and a part of the outer surface 33 connected to the end surface 32. At least a part of the outer surface 33 of the connecting tubular portion 13 is an exposed surface 34 where the metal portion is exposed, and the conductive portion 8 of the elastic tube 7 can come into direct contact with the exposed surface 34.

[0042] The clamps 19 are members for fastening the elastic tube 7 to the connecting tubular portion 13. The clamps 19 have an arc portion 20, a first arm portion 21, a second arm portion 22, and a retaining member 23. The number of clamps 19 is the same as the number of connecting tubular portions 13. The clamps 19 shown in Figures 7 and 8 have the same configuration as the clamps 19 shown in Figures 2 and 3, so a description thereof will be omitted here.

[0043] Although not shown, the joint 10 may have other shapes. The joint 10 in Fig. 2 is linear, but it may also be L-shaped. The joint 10 in Fig. 7 is T-shaped, but it may also be cross-shaped. Furthermore, the joint 10 may have multiple branched portions, each of which is provided with a connecting tubular portion 13 to which the elastic tube 7 is connected.

[0044] [Regarding each type of joint 10] As described above, the joint 10 of each of the above embodiments has a metal joint body 12, a resin layer 17, and a clamp 19. The joint body 12 has a plurality of (two in FIG. 2, three in FIG. 7) connecting tubular portions 13 onto which the elastic tubes 7 are fitted. The resin layer 17 is provided on the inner surface 14 of the joint body 12, including the connecting tubular portions 13. The clamp 19 is a member for fastening the elastic tubes 7 to the connecting tubular portions 13.

[0045] According to each of the above-described forms of the joint 10, even if the joint body 12 is made of metal, the resin layer 17 is provided on the inner surface 14 of the joint body 12, which is the liquid-contacting surface. Therefore, the joint 10 can be used even if the liquid flowing through the elastic tube 7 and the joint 10 is a liquid that cannot come into contact with anything other than resin.

[0046] The joint body 12 having the connecting tubular portion 13 is made of metal. The elastic tube 7 fitted onto the connecting tubular portion 13 has a conductive portion 8 on its inner periphery. Therefore, when one elastic tube 7 is connected to (one or more) other elastic tubes 7 via the joint 10, the joint 10 can ensure electrical continuity between the one elastic tube 7 and the other elastic tubes 7.

[0047] In each of the above-described forms of the joint 10, at least a portion of the outer surface 33 of the connecting tubular portion 13 is an exposed surface 34 that can come into direct contact with the conductive portion 8 of the elastic tube 7. In other words, the inner surface 14 of the joint body 12 including the connecting tubular portion 13 is the resin layer 17, but at least a portion of the outer surface 33 of the connecting tubular portion 13 is an exposed surface 34 that is not covered by the resin layer 17. The conductive portion 8 of the elastic tube 7 comes into contact with the exposed surface 34. This ensures electrical continuity between one elastic tube and (one or more) other elastic tubes 7 connected via the joint 10.

[0048] The resin layer 17 may be provided on at least the inner surface 31 of the connecting tubular portion 13 . However, in the case of each of the above-described forms of joint 10, the resin layer 17 is provided on the connecting tubular portion 13 not only on the inner surface 31 but also on the end face 32 connected to the inner surface 31 and on a part of the outer surface 33 connected to the end face 32. This configuration of the resin layer 17 makes it possible to reliably obtain a configuration in which liquid does not come into direct contact with the metal joint body 12. The resin layer 17 is continuous from the inner surface 31 of the connecting tubular portion 13, via the end face 32, to a part of the outer surface 33. This increases the bonding strength of the resin layer 17 to the joint body 12.

[0049] The coefficient of friction of the resin layer 17 is lower than the coefficient of friction of the outer surface 33 of the connecting tubular portion 13, which is a metal surface. Therefore, since the end surface 32 and part of the outer surface 33 of the connecting tubular portion 13 are covered with the resin layer 17, the operation of fitting (attaching) the elastic tube 7 to the connecting tubular portion 13 can be facilitated.

[0050] In each of the above-described forms of joint 10, the outer surface 33 of the connecting tubular portion 13 is a straight tubular shape without any irregularities. This configuration provides higher conductivity with the elastic tube 7 having the conductive portion 8 on its inner periphery than when the outer surface 33 of the connecting tubular portion 13 is a tubular shape with irregularities (FIG. 5). As shown in FIG. 5, the outer surface 33 of the connecting tubular portion 13 may have an uneven shape, in which case the connection strength of the elastic tube 7 at the connecting tubular portion 13 increases.

[0051] [Note] A reference invention of the present disclosure is the joint 10 shown below. In addition, with regard to the joint 10 shown below, the same components as those of the joint 10 of each of the above embodiments are denoted by the same reference numerals. The components of each of the above embodiments can be applied to the joint 10 shown below.

[0052] That is, the joint according to another reference invention of the present disclosure is as follows: A joint 10 for connecting an elastic tube 7 for conveying a liquid, a joint body 12 having a connecting tubular portion 13 into which the elastic tube 7 is fitted; a clamp 19 for fastening the elastic tube 7 to the connecting tubular portion 13; and The clamp 19 (see FIG. 6) an arcuate portion 20 having an arcuate fastening surface 203 that covers the connecting tubular portion 13 except for a circumferential portion 131; a first arm portion 21 extending from a first circumferential end portion 201 of the arc portion 20; a second arm portion 22 extending from a second circumferential end 202 of the arc portion 20; and a stopper member 23 that restrains the first arm portion 21 and the second arm portion 22 in a state where they are close to each other.

[0053] According to the joint 10, the elastic tube 7 is fitted onto the connecting tubular portion 13, and the arc portion 20 of the clamp 19 is attached to the outer periphery of the elastic tube 7. The first arm portion 21 and the second arm portion 22 extending from the arc portion 20 are brought close to each other, and the retaining member 23 restrains them in this state, thereby fastening the elastic tube 7 to the connecting tubular portion 13.

[0054] The first arm portion 21 is provided with a through hole 211 through which the shaft portion 231 passes, and the second arm portion 22 is provided with a screw hole 221 into which the screw portion of the shaft portion 231 engages. The through hole 211 and the screw hole 221 are holes that are oriented perpendicular to an imaginary straight line L that is parallel to the axial direction of the arc portion 20. Therefore, the shaft portion 231 is inserted through the through hole 211 in a direction that is perpendicular to the imaginary straight line L. This configuration allows the space required for the tightening operation of the clamp 19 to be reduced. The fastening member 23 may be a bolt (a hexagon socket head bolt), but may be something else.

[0055] 〔others〕 The embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is not limited to the above-described embodiments, and includes all modifications within the scope of equivalents to the configurations described in the claims. [Explanation of symbols]

[0056] 7 Elastic Tube 8 Conductive part 9 Tube body 10 Joints 12 Joint body 13 Connecting tube 131 Part of the circumferential direction of the connecting tube 14 Inner surface of joint body 17 Resin layer 19 Clamp 20 Arc section 201 First circumferential end 202 Circumferential second end 203 Clamping surface 21 First arm 22 Second arm section 23 Stopper 26 First shell 27 Second shell 28 Third shell 271,281 Thin-walled parts 32 End face 33 Exterior 34 Exposed surface

Claims

1. A joint for connecting an elastic tube for conveying a liquid, a metal joint body having a connecting tubular portion into which the elastic tube is fitted; a resin layer provided on the inner surface of the joint body including the connecting tubular portion; a clamp for fastening the elastic tube to the connecting tubular portion; A joint having:

2. the elastic tube has a conductive portion at least on its inner periphery, At least a part of the outer surface of the connecting tube portion is an exposed surface that can come into direct contact with the conductive portion.

2. The joint of claim 1.

3. The resin layer is further provided on an end surface of the connecting tube portion that is connected to the inner surface and on a part of an outer surface that is connected to the end surface. A joint according to claim 1 or claim 2.

4. The joint according to claim 2 , wherein the outer surface of the connecting tube portion has a linear cylindrical shape.

5. The clamp is an arcuate portion having an arcuate fastening surface that covers the connecting tubular portion except for a portion in the circumferential direction; a first arm portion extending from a first circumferential end of the arc portion; a second arm portion extending from a second circumferential end of the arc portion; a stopper member that restrains the first arm portion and the second arm portion in a state where they are close to each other; 3. A joint according to claim 1 or claim 2, having:

6. the arc portion has a first shell portion located circumferentially opposite to the circumferential part of the connecting cylindrical portion, and a second shell portion and a third shell portion connected to adjacent ones of the first shell portion on both sides in the circumferential direction, The joint according to claim 5 , wherein at least one of the second shell portion and the third shell portion includes a portion that is thinner than the first shell portion.

Images