Joint device

Abstract

The present invention provides a joint device that prevents foreign matter from leaking out after cleaning, thereby preventing malfunctions in other equipment. [Solution] The joint device 1 of the embodiment comprises a first joint 2 and a second joint 3. The first joint 2 comprises a first housing 4 and a first check valve 5. The second joint 3 comprises a second housing 40 and a second check valve 41. The first housing 4 is provided with an O-ring 21 to ensure sealing with the second housing 40, and a cleaning port 22 is provided that connects the gap between the tip surface 29b of the slide valve 25 and the tip surface 63b of the second body 63, and the gap between the tip surface 39b of the first inner valve 26 and the tip surface 76b of the second inner valve 64 to the outside of the first housing 4 when the first housing 4 and the second housing 40 are fitted together at the position of the O-ring 21.

Description

Technical Field

[0001] The present invention relates to a joint device.

Background Art

[0002] Conventionally, a joint device for connecting pipes and the like for allowing a fluid used in industrial equipment and the like to flow through has been known. Some joint devices are devices that automate the attachment and detachment work. In such a joint device, joints are provided on each of the two pipes to be connected. Each of the two joints includes a valve body that opens and closes the flow path of the pipe.

[0003] Each valve body is biased by a spring in a direction to close the flow path when the joints are separated (removed). Thereby, it is possible to prevent the fluid from leaking from each pipe. When connecting the two joints, the opposing surfaces (front end surfaces) of the two joints are abutted against each other, and each joint is further pushed in. Then, each valve body moves in a direction to open the flow path against the spring. Thereby, the fluid can flow through the flow path in the pipes connected via the joint device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-described conventional technology, when the two joints are removed, fluid may adhere to the opposing surfaces of each joint. When the fluid adhering to this opposing surface is exposed to the outside air, the components may change due to oxidation or the like and become foreign substances. Therefore, when the joints are connected again, foreign substances may flow out from the joint device, and there is a possibility that problems may occur in industrial equipment and the like. For this reason, it is desirable to clean the opposing surfaces of each joint when the two joints are removed.

[0006] However, if fluid gets into the tiny gaps between components on the opposing surfaces of each joint, it is difficult to completely remove this fluid by cleaning. As a result, foreign matter may leak out of the joint device after cleaning and reconnection, potentially causing malfunctions in industrial equipment, etc.

[0007] The present invention provides a joint device that can prevent foreign matter from leaking out after cleaning, thereby preventing malfunctions in other equipment. [Means for solving the problem]

[0008] A coupling device according to one aspect of the present invention comprises a first coupling and a second coupling disposed opposite to the first coupling and attached to and detached from the first coupling by moving closer to and further away from the first coupling, wherein the first coupling comprises a cylindrical first housing whose axial direction is oriented toward the direction opposite to the second coupling and a first check valve housed in the first housing that forms a first flow path and opens and closes the first flow path, wherein the second coupling comprises a cylindrical second housing fitted to the inner circumferential surface of the first housing and a second check valve housed in the second housing that forms a second flow path and opens and closes the second flow path, wherein the first coupling and the second coupling have a first opposing surface with respect to the second check valve and the first check valve with respect to the second check valve When the valve and the second opposing surface are connected so as to abut against each other, the first and second passages are opened and the first and second passages are connected. At least one of the first and second housings is provided with a sealing portion to ensure a seal between the first and second housings when they are fitted together. The sealing portion is positioned where the first and second housings are fitted together with the first and second opposing surfaces spaced apart. The first housing is provided with a cleaning port that connects the gap between the first and second opposing surfaces to the outside of the first housing when the first and second housings are fitted together at the position of the sealing portion.

[0009] This configuration allows the first and second opposing surfaces to be separated before the first and second joints are completely removed. That is, the first and second opposing surfaces can be separated while the first and second housings are fitted together at the seal position. In this state, the first and second opposing surfaces are surrounded by their respective housings and are not exposed to the outside air. In this state, cleaning fluid can be supplied to the first and second opposing surfaces through the cleaning port provided in the first housing. That is, each opposing surface can be cleaned without being exposed to the outside air. Therefore, the fluid adhering to each opposing surface is not exposed to the outside air. Thus, after cleaning each opposing surface, the outflow of foreign matter due to oxidation of the fluid can be prevented, and malfunctions in other equipment can be prevented.

[0010] In the above configuration, the first check valve comprises a cylindrical slide valve provided to slide movably in the axial direction of the first housing, a first internal valve housed within the slide valve and whose movement relative to the first housing is restricted, and a first elastic member housed in a first elastic member housing provided between the first housing and the slide valve. The end faces of the slide valve and the first internal valve on the second joint side each include the first opposing surface, a first flow path is formed between the slide valve and the first internal valve, the first flow path is opened and closed by the sliding movement of the slide valve, and the first elastic member is located at a separate location separated from the first flow path and biases the slide valve in a direction that closes the first flow path.

[0011] In the above configuration, the first flow path and the first elastic member housing are separated by the first housing and the slide valve.

[0012] In the above configuration, the second check valve comprises a cylindrical body arranged coaxially with the axial direction of the second housing and whose movement relative to the second housing is restricted; a second internal valve housed within the body and slidably movable in the axial direction of the body; and a second elastic member housed inside a second elastic member housing provided on the side of the second housing opposite the first joint. The end faces of the body and the second internal valve on the first joint side each include the second opposing surface, a second flow path is formed between the body and the second internal valve, the second flow path is opened and closed by the sliding movement of the second internal valve, and the second elastic member is located at a separate location separated from the second flow path and biases the second internal valve in a direction that closes the second flow path.

[0013] In the above configuration, the second flow path and the interior of the second elastic member storage section are separated by at least one of the walls of the second housing and the second elastic member storage section.

[0014] In the above configuration, the first check valve comprises a cylindrical slide valve provided to slide movably in the axial direction of the first housing, a first internal valve housed within the slide valve and whose movement relative to the first housing is restricted, and a first elastic member housed in a first elastic member housing provided between the first housing and the slide valve, wherein the end faces of the slide valve and the first internal valve on the second joint side each include the first opposing surface, a first flow path is formed between the slide valve and the first internal valve, the first flow path is opened and closed by the sliding movement of the slide valve, the first elastic member biases the slide valve in a direction that closes the first flow path, and the second check valve is arranged coaxially with the axial direction of the second housing and whose movement relative to the second housing is restricted The device comprises a controlled cylindrical body, a second internal valve housed within the body and slidably mounted in the axial direction of the body, and a second elastic member housed inside a second elastic member housing provided on the side of the second housing opposite the first joint, wherein the end faces of the body and the second internal valve on the first joint side each include the second opposing surface, a second flow path is formed between the body and the second internal valve, the second flow path is opened and closed by the sliding movement of the second internal valve, the second elastic member biases the second internal valve in a direction that closes the second flow path, and an end face sealing portion is provided on at least one of the first opposing surface of the slide valve and the second opposing surface of the body to seal the space between the slide valve and the body when the slide valve and the body abut against each other. [Effects of the Invention]

[0015] The aforementioned joint device can prevent foreign matter from flowing out after cleaning, thereby preventing malfunctions in other equipment. [Brief explanation of the drawing]

[0016] [Figure 1] This is a cross-sectional view of a joint device in an embodiment of the present invention, showing the state in which the first joint 2 and the second joint 3 have been removed. [Figure 2]Cross-sectional view of the first joint in an embodiment of the present invention. [Figure 3] Cross-sectional view taken along line III-III of FIG. 2. [Figure 4] Cross-sectional view of the second joint in an embodiment of the present invention. [Figure 5] Cross-sectional view of the joint device in an embodiment of the present invention, showing a state where the first joint 2 and the second joint 3 are connected. [Figure 6] Cross-sectional view of the joint device in an embodiment of the present invention, showing the end face cleaning posture.

Embodiments for Carrying Out the Invention

[0017] Next, embodiments of the present invention will be described based on the drawings.

[0018] <Joint device> FIG. 1 is a cross-sectional view of the joint device 1, showing a state where the first joint 2 and the second joint 3 are removed. As shown in FIG. 1, the joint device 1 is used for an automatic attaching / detaching device 100 of an external pipe (not shown). The automatic attaching / detaching device 100 includes two arms 100a and 100b (first arm 100a, second arm 100b) that approach and separate from each other. The joint device 1 includes a first joint (nipple) 2 attached to the first arm 100a among the two arms 100a and 100b, and a second joint (coupling) 3 attached to the second arm 100b among the two arms 100a and 100b. The first joint 2 and the second joint 3 face each other in the approaching and separating directions of the two arms 100a and 100b and are detachable from each other.

[0019] <First joint> FIG. 2 is a cross-sectional view of the first joint 2. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2. As shown in FIGS. 1 to 3, the first joint 2 includes a cylindrical first housing 4 attached to the first arm 100a and having the axial direction as the direction facing the second joint 3, and a first check valve 5 housed in the first housing 4. In the following description of the first joint 2, the axial direction of the first housing 4 is simply referred to as the axial direction. The circumferential direction around the axial direction is referred to as the circumferential direction. The radial direction of the first housing 4 orthogonal to the axial direction and the circumferential direction is simply referred to as the radial direction.

[0020] <First housing> The first housing 4 includes a first body 6 attached to the first arm 100a, a cylindrical first guide 7 disposed on the second joint 3 side of the first body 6, and a cylindrical pipe socket 8 disposed on the side of the first body 6 opposite to the first guide 7. The first body 6 includes a disc-shaped base portion 9. The first body 6 is attached to the first arm 100a in such a manner that the base portion 9 is disposed on one surface of the first arm 100a on the second joint 3 side. A cylindrical guide cylinder portion 10 is integrally formed at the radial center of the base portion 9. The guide cylinder portion 10 protrudes along the axial direction from the base portion 9 and toward the second joint 3.

[0021] A cylindrical support column 13 is integrally formed on the first end surface 9a of the base portion 9 opposite to the second joint 3. The support column 13 is disposed coaxially with the base portion 9. The central portion in the radial direction of the support column 13 functions as a support portion 13a for supporting the first check valve 5. A female screw portion 13b for fixing the first check valve 5 is formed on the support portion 13a. A first central flow path 14 is formed around the support portion 13a in the support column 13. An O-ring groove 15 is formed over the entire circumference on the outer peripheral surface of the support column 13 near the end opposite to the second joint 3. An O-ring 16 is mounted in the O-ring groove 15.

[0022] A spring housing recess 11 is formed on the second end face 9b of the base portion 9 on the second joint 3 side, along the outer circumferential surface of the guide cylinder portion 10. The spring housing recess 11 is formed in an annular shape when viewed from the axial direction. A cylindrical fitting cylinder portion 12 is integrally molded on the second end face 9b of the base portion 9 along the outer circumferential edge of the spring housing recess 11. The fitting cylinder portion 12 protrudes from the base portion 9 axially and toward the second joint 3. The protruding height of the fitting cylinder portion 12 is sufficiently lower than the protruding height of the guide cylinder portion 10. The first guide 7 is fitted into the fitting cylinder portion 12.

[0023] A check valve sliding surface 7c is formed on the inner circumferential surface of the first guide 7 over most of the axial center. The inner diameter of the check valve sliding surface 7c is approximately the same as the outer diameter of the spring housing recess 11. A fitting inner circumferential surface 17 is formed on the first end 7a of the first guide 7 opposite to the second joint 3. The inner diameter of the fitting inner circumferential surface 17 is larger than the inner diameter of the check valve sliding surface 7c via a stepped portion 17a. The outer circumferential surface of the fitting cylinder portion 12 is fitted onto the fitting inner circumferential surface 17.

[0024] A seal inner circumferential surface 18 is formed at the second end 7b on the second joint 3 side of the first guide 7. The inner diameter of the seal inner circumferential surface 18 is larger than the inner diameter of the check valve sliding surface 7c via a stepped portion 18a. An O-ring groove (an example of a seal portion in the claim) 19 is formed around the entire circumference of the seal inner circumferential surface 18 near the second end 7b. An O-ring (an example of a seal portion in the claim) 21 is fitted into the O-ring groove 19.

[0025] Multiple (for example, four in this embodiment) cleaning ports 22 are formed on the inner circumferential surface 18 of the seal. Each cleaning port 22 connects the outer circumferential surface of the first guide 7 to the inner circumferential surface 18 of the seal. Each cleaning port 22 is arranged at equal intervals in the circumferential direction. Each cleaning port 22 has a female threaded portion 24. A cleaning hose (not shown) is fastened to the female threaded portion 24. A cleaning fluid (not shown) flows through each cleaning port 22 via this cleaning hose (details will be described later).

[0026] Of the total number of cleaning ports 22, half (for example, two in this embodiment) function as cleaning inlets 22a. The remaining half function as cleaning outlets 22b. Each cleaning inlet 22a is adjacent to another in the circumferential direction. Each cleaning outlet 22b is adjacent to another in the circumferential direction. The position of each cleaning outlet 22b is slightly shifted closer to the second end 7b than the position of each cleaning inlet 22a. This improves the outflow of the cleaning fluid (details will be described later).

[0027] The inner circumferential surface 8a of the pipe socket 8, from the axial center to the end on the first body 6 side, is fitted to the outer circumferential surface of the support column 13. An O-ring 16 is attached to the support column 13, and this O-ring 16 seals the space between the support column 13 and the pipe socket 8. A first base channel 23, which communicates with the first central channel 14, is formed inside the pipe socket 8. The inner diameter of the inner circumferential surface 8a of the pipe socket 8 gradually decreases from the axial center toward the side opposite the first body 6. As a result, the cross-sectional area of ​​the first base channel 23 also gradually decreases from the axial center toward the side opposite the first body 6. External piping (not shown) is attached to the side of the pipe socket 8 opposite the first body 6.

[0028] <First check valve> The first check valve 5 comprises a cylindrical slide valve 25 fitted to the inner circumferential surface of the first guide 7 and provided to be slidable in the axial direction, a first inner valve 26 housed radially inside the slide valve 25, and a compression coil spring 27 arranged in the spring storage recess 11 of the first housing 4. The slide valve 25 is integrally molded with a cylindrical slide valve body 28 and a flange portion 29 that protrudes radially outward from the end of the slide valve body 28 on the second joint 3 side.

[0029] The outer circumferential surface 28a of the end of the slide valve body 28 opposite to the second joint 3 is slidably fitted to the inner circumferential surface of the guide cylinder portion 10 of the first body 6. An O-ring groove 31 is formed around the entire circumference of this fitted outer circumferential surface 28a. An O-ring 32 is fitted into the O-ring groove 31. This seals the space between the slide valve body 28 and the guide cylinder portion 10. The slide valve body 28 and the guide cylinder portion 10 cooperate to form a first valve body passage 35 that communicates with the first central passage 14.

[0030] Of the inner circumferential surface 28b of the slide valve body 28, the portion corresponding to the flange portion 29 gradually decreases in inner diameter as it approaches the second joint 3. As a result, the cross-sectional area of ​​the first valve body passage 35 also gradually decreases in the portion corresponding to the flange portion 29 as it approaches the second joint 3. Hereinafter, the minimum diameter of the inner circumferential surface 28b of the slide valve body 28 on the tip surface 29b side of the flange portion 29 on the second joint 3 side will simply be referred to as the minimum diameter of the inner circumferential surface 28b.

[0031] The outer circumferential surface 29a of the flange portion 29 is fitted onto the check valve sliding surface 7c of the first guide 7. An O-ring groove 33 is formed around the entire circumference of the outer circumferential surface 29a of the flange portion 29. An O-ring 34 is fitted into the O-ring groove 33. This seals the space between the flange portion 29 and the first guide 7.

[0032] A counterbore recess 82 is formed in the radial center of the tip surface 29b of the flange portion 29. The counterbore recess 82 is formed in a circular shape when viewed from the axial direction. The outer diameter of the counterbore recess 82 is larger than the minimum diameter of the inner circumferential surface 28b of the slide valve body 28. An O-ring groove 91 is formed on the tip surface 29b of the flange portion 29, surrounding the counterbore recess 82. An O-ring 92 is fitted into the O-ring groove 91.

[0033] The compression coil spring 27 is housed in a spring housing 81 surrounded by the slide valve 25, the first body 6 (guide cylinder portion 10), and the first guide 7. The space between the slide valve body 28 of the slide valve 25 and the guide cylinder portion 10 is sealed by an O-ring 32. The space between the flange portion 29 of the slide valve 25 and the first guide 7 is sealed by an O-ring 34. Therefore, the spring housing 81 is separated from the first valve body passage 35 by the first housing 4 (guide cylinder portion 10) and the slide valve 25.

[0034] The end of the compression coil spring 27 opposite to the second joint 3 abuts against the bottom surface of the spring housing recess 11. The end of the compression coil spring 27 on the second joint 3 side abuts against the rear end surface 29c of the flange portion 29 which faces the spring housing recess 11 in the axial direction. The compression coil spring 27 is housed in a slightly compressed state between the spring housing recess 11 and the flange portion 29. As a result, the slide valve body 28 is biased toward the second joint 3.

[0035] The first internal valve 26 has a valve body 37 formed in the shape of a rod extending in the axial direction. The valve body 37 is arranged coaxially with the first housing 4. When the first joint 2 and the second joint 3 are removed, the valve body 37 extends from the support column 13 to the stepped portion 18a of the first guide 7. The outer diameter of the portion of the valve body 37 corresponding to the guide cylinder portion 10 is sufficiently smaller than the inner diameter of the guide cylinder portion 10. The outer diameter of the portion of the valve body 37 corresponding to the slide valve body 28 is sufficiently smaller than the inner diameter of the slide valve body 28. Therefore, even when the valve body 37 is inserted inside the guide cylinder portion 10 and inside the slide valve 25, the first valve body passage 35 is sufficiently secured.

[0036] A male threaded portion 36 is formed coaxially with the valve body 37 at the end of the valve body 37 on the second joint 3 side. The outer diameter of the male threaded portion 36 is smaller than the outer diameter of the valve body 37 via a stepped portion 36a. The valve body 37 (first inner valve 26) is supported by the support portion 13a when the male threaded portion 36 is fastened to the female threaded portion 13b of the support portion 13a. The first inner valve 26 is positioned relative to the first housing 4 when the stepped portion 36a abuts against the support portion 13a. A base portion 38 is formed at the end of the valve body 37 on the second joint 3 side. The outer diameter of the base portion 38 gradually increases as it approaches the second joint 3. The outer diameter of the tip surface 38a of the base portion 38 on the second joint 3 side is the same as the minimum diameter of the inner circumferential surface 28b of the slide valve body 28.

[0037] A female threaded portion 38b is formed in the radial center of the tip surface 38a of the base portion 38. A cover portion 39 is fastened to the female threaded portion 38b. The cover portion 39 comprises a disc-shaped cover body 39a that overlaps the tip surface 38a of the base portion 38. The outer diameter of the cover body 39a is the same as the counterbore recess 82 of the slide valve 25. Such a cover 39 is fastened from the counterbore recess 82 side to the tip surface 38a of the base 38. Therefore, the cover body 39a is positioned in the counterbore recess 82. This restricts the slide valve 25 from coming out toward the second joint 3 side.

[0038] When the cover body 39a is positioned in the counterbore recess 82, the first valve body passage 35 is blocked by the cover body 39a (hereinafter, this state will be referred to as the blocked state of the first internal valve 26). The slide valve 25 is biased toward the second joint 3 by the compression coil spring 27. Therefore, when the first joint 2 and the second joint 3 are removed, the first internal valve 26 is in the blocked state.

[0039] When the first internal valve 26 is closed, the tip surface 39b of the lid body 39a on the second joint 3 side and the tip surface 29b of the slide valve 25 (flange portion 29) are located on the same plane. An O-ring 30 is fitted between the outer circumferential surface of the lid body 39a and the outer circumferential surface of the base portion 38. When the first internal valve 26 is closed, the O-ring 30 seals the space between the lid portion 39 and the slide valve 25.

[0040] <Second joint> Figure 4 is a cross-sectional view of the second joint 3. As shown in Figures 1 and 3, the second joint 3 is attached to the second arm 100b and comprises a cylindrical second housing 40 whose axial direction is opposite to the first joint 2, and a second check valve 41 housed within the second housing 40. In the following description of the second joint 3, the axial direction of the second housing 40 will be simply referred to as the axial direction. The circumferential direction centered on the axial direction will be referred to as the circumferential direction. The radial direction of the second housing 40 that is perpendicular to the axial and circumferential directions will be simply referred to as the radial direction.

[0041] <Second Housing> The second housing 40 includes a cylindrical second guide 42 attached to the second arm 100b, and a bottomed cylindrical piping body 43 located on the opposite side of the second guide 42 from the first joint 2. The second guide 42 comprises a cylindrical guide body 44 and an outer flange portion 45 that protrudes radially outward from the end of the guide body 44 opposite to the first joint 2. The outer flange portion 45 of the second guide 42 is positioned on one surface of the second arm 100b on the side of the first arm 100a. The outer flange portion 45 is fixed to the second arm 100b via an annular retaining washer 50.

[0042] The guide body 44 is positioned coaxially with the first guide 7 in the first joint 2. The outer diameter of the guide body 44 is the same as or slightly smaller than the inner diameter of the inner circumferential surface 18 of the seal in the first guide 7. The inner diameter of the guide body 44 is slightly smaller than the diameter of the outer circumferential surface 29a of the flange portion 29 in the first joint 2.

[0043] An O-ring groove 46a is formed around the entire circumference of the inner circumferential surface of the guide body 44 at the end on the first joint 2 side. An O-ring 47 is fitted into the O-ring groove 46a. A fixing groove 46b is formed around the entire circumference of the inner circumferential surface of the guide body 44 at the axial center. The fixing groove 46b is used to fix the second check valve 41 (details will be described later). On the inner circumferential surface of the guide body 44, a female threaded portion 48 is formed on the side opposite to the first joint 2 from the fixing groove 46b. The piping body 43 is fastened to the female threaded portion 48.

[0044] The piping body 43 is positioned coaxially with the second guide 42, with its bottom 43a facing away from the second guide 42. A male threaded portion 49 is formed on the outer circumferential surface of the piping body 43 at the end facing the second guide 42. This male threaded portion 49 is fastened to the female threaded portion 48 of the second guide 42. The inner circumferential surface 51 of the pipe body 43 forms a second central flow path 52 within the pipe body 43. The inner circumferential surface 51 of the pipe body 43 has a fitting inner circumferential surface 51a formed from the axial center to the end on the first joint 2 side, an inclined inner circumferential surface 51b formed on the bottom 43a side of the fitting inner circumferential surface 51a, and a reduced diameter inner circumferential surface 51c connected to the fitting inner circumferential surface 51a via the inclined inner circumferential surface 51b.

[0045] The inclined inner circumferential surface 51b gradually decreases in inner diameter as it approaches the bottom 43a of the pipe body 43. The reduced-diameter inner circumferential surface 51c is formed with an inner diameter smaller than the inner diameter of the fitting inner circumferential surface 51a. In other words, the cross-sectional area of ​​the second central flow path 52 is smaller from the axial center towards the bottom 43a than from the axial center towards the first joint 2. A side channel 53 is formed on the inclined inner circumferential surface 51b, which penetrates radially through the circumferential wall portion 43b of the piping body 43. The outer circumferential surface of the piping body 43 and the second central channel 52 are connected via the side channel 53. A flat section 54 is formed on the outer circumferential surface of the circumferential wall portion 43b where the side channel 53 is formed. External piping (not shown) is attached to the flat section 54.

[0046] A check valve insertion hole 55 is formed in the radial center of the bottom 43a of the piping body 43. A second check valve 41 is inserted into the check valve insertion hole 55. The check valve insertion hole 55 is formed in a stepped shape and penetrates the bottom 43a axially. That is, the check valve insertion hole 55 has a first insertion hole 55a formed on the first joint 2 side of the bottom 43a, a stepped portion 55b formed on the opposite side of the first insertion hole 55a from the first joint 2, and a second insertion hole 55c connected to the first insertion hole 55a via the stepped portion 55b. The inner diameter of the second insertion hole 55c is formed to be larger than that of the first insertion hole 55a.

[0047] An O-ring groove 57 is formed around the entire circumference of the inner surface of the first insertion hole 55a. An O-ring 58 is fitted into the O-ring groove 57. A spacer 59 is fitted into the second insertion hole 55c. The spacer 59 is sandwiched between the stepped portion 55b of the check valve insertion hole 55 and the spring box 56, which will be described later.

[0048] A bottomed cylindrical spring box 56 is attached to the bottom 43a of the piping body 43. The spring box 56 is mounted with its bottom 56a facing away from the piping body 43. A through hole 56e is formed in the bottom 56a of the spring box 56, passing through it axially from the radial center. The tip 56d of the peripheral wall portion 56b of the spring box 56, on the side of the opening 56c, is fitted into the second insertion hole 55c of the check valve insertion hole 55. The spacer 59 is sandwiched between the tip 56d of the spring box 56 and the stepped portion 55b of the check valve insertion hole 55.

[0049] An outer flange portion 61 is integrally formed on the peripheral wall portion 56b of the spring box 56, extending radially outward from the tip portion 56d. The spring box 56 is attached to the bottom portion 43a of the piping body 43 such that the outer flange portion 61 overlaps with the bottom portion 43a of the piping body 43. A compression coil spring 62 is housed in this spring box 56. The compression coil spring 62 constitutes part of the second check valve 41.

[0050] <Second check valve> The second check valve 41 includes, in addition to the compression coil spring 62, a cylindrical second body 63 that fits onto the inner circumferential surface of the guide body 44 in the second guide 42 and also fits onto the fitting inner circumferential surface 51a of the piping body 43, and a second internal valve 64 housed radially inside the second body 63.

[0051] An outer flange portion 65 is integrally molded at the axial center of the second body 63, protruding radially outward. The outer flange portion 65 fits into the fixing groove 46b of the second guide 42. The outer flange portion 65 is then sandwiched between the side surface 46c of the fixing groove 46b and the peripheral wall portion 43b of the piping body 43. This restricts the axial movement of the second body 63 relative to the second housing 40.

[0052] Of the second body 63, the side facing the first joint 2, with the outer flange portion 65 in between, is fitted to the inner circumferential surface of the guide body 44 of the second guide 42. The inner diameter of the guide body 44 is slightly smaller than the diameter of the outer circumferential surface 29a of the flange portion 29 of the first joint 2. Therefore, the outer diameter of the second body 63 on the side facing the first joint 2 is slightly smaller than the diameter of the outer circumferential surface 29a of the flange portion 29.

[0053] The tip surface 63b of the second body 63 on the first joint 2 side protrudes toward the first joint 2 more than the tip surface 44a of the guide body 44 on the first joint 2 side. The height of the protrusion of the tip surface 63b of the second body 63 from the tip surface 44a of the guide body 44 is denoted as H2 (hereinafter referred to as the protrusion height H2 of the second body 63). The height between the tip surface 29b of the slide valve 25 (flange portion 29) of the first joint 2 and the O-ring 21 provided on the first guide 7 is denoted as H1 (see Figure 2; hereinafter referred to as the seal height H1 of the first guide 7). At this time, the protrusion height H2 of the second body 63 and the seal height H1 of the first guide 7 are, H2 It satisfies the condition.

[0054] ​ The space between the second body 63 and the second guide 42 is sealed by an O-ring 47 provided on the second guide 42. The part of the second body 63 opposite to the first joint 2, with the outer flange portion 65 in between, is fitted onto the inner circumferential surface 51a of the piping body 43. An O-ring groove 66 is formed around the entire circumference of the outer surface of the second body 63, near the end opposite to the first joint 2. An O-ring 67 is fitted into the O-ring groove 66. This seals the space between the second body 63 and the piping body 43.

[0055] By being sealed in this manner, the second body 63 and the piping body 43 cooperate to form a second valve body passage 68 that communicates with the second central passage 52. Of the inner circumferential surface 63a of the second body 63, the inner diameter gradually decreases towards the first joint 2 at the end on the first joint 2 side. As a result, the cross-sectional area of ​​the second valve body passage 68 also gradually decreases towards the first joint 2 at the end on the first joint 2 side.

[0056] Therefore, the diameter of the inner circumferential surface 63a of the second body 63 is smallest at the tip surface 63b of the second body 63. Hereinafter, the diameter of the inner circumferential surface 63a at this tip surface 63b will be referred to as the minimum diameter of the inner circumferential surface 63a. The minimum diameter of the inner circumferential surface 63a of the second body 63 is larger than the outer diameter of the counterbore recess 82 in the first joint 2 (slide valve 25) and smaller than the inner diameter of the O-ring 92 provided on the slide valve 25.

[0057] The second internal valve 64 is configured to be divided into two parts in the axial direction. Specifically, the second internal valve 64 comprises a front valve 71 located on the side of the first joint 2 and a rear valve 72 located on the opposite side of the front valve 71 from the first joint 2. The front valve 71 has a front valve body 73 that is formed in the shape of a rod extending in the axial direction. The front valve body 73 is arranged coaxially with the second housing 40. When the first joint 2 and the second joint 3 are removed, the front valve body 73 extends along the entire axial direction of the second body 63. The outer diameter of most of the front valve body 73 is sufficiently smaller than the diameter of the inner circumferential surface 63a of the second body 63. Therefore, even when the front valve 71 is inserted inside the second body 63, the second valve body passage 68 is sufficiently secured.

[0058] A guide flange portion 74 is integrally molded at the axial center of the front valve body 73, protruding radially outward. The outer diameter of the guide flange portion 74 is slightly smaller than the inner diameter of the inner circumferential surface 63a of the second body 63. Therefore, the outer circumferential surface of the guide flange portion 74 is slidably fitted to the inner circumferential surface 63a of the second body 63. As a result, the front valve 71 is provided so as to be able to slide axially relative to the second body 63 while maintaining a position coaxial with the second housing 40.

[0059] Multiple flange passages 74a are formed in the guide flange portion 74. The flange passages 74a penetrate the guide flange portion 74 in the axial direction and communicate with the second valve body passages 68. Each of the second valve body passages 68 is arranged at equal intervals in the circumferential direction. A disc-shaped base portion 75 is formed at the end of the front valve body 73 on the side of the first joint 2. The outer diameter of the base portion 75 is slightly larger than the minimum diameter of the inner circumferential surface 63a of the second body 63.

[0060] A female threaded portion 75b is formed in the radial center of the tip surface 75a of the base portion 75 on the side of the first joint 2. A cover portion 76 is fastened to the female threaded portion 75b. The cover portion 76 comprises a cover body 76a that overlaps the tip surface 75a of the base portion 75. The outer circumferential surface of the cover body 76a gradually decreases toward the first joint 2 so that its outer diameter corresponds to the inner circumferential surface 63a of the second body 63. As a result, the outer circumferential surface of the cover body 76a abuts against the inner circumferential surface 63a of the second body 63, restricting the forward valve 71 from coming out toward the first joint 2. The outer diameter of the cover body 76a is larger than the outer diameter of the cover body 39a at the first joint 2.

[0061] When the outer surface of the lid body 76a abuts against the inner surface 63a of the second body 63, the second valve body passage 68 is blocked by the lid body 76a (hereinafter, this state will be referred to as the blocked state of the second internal valve 64). In the blocked state of the second internal valve 64, the tip surface 76b of the lid body 76a on the first joint 2 side and the tip surface 63b of the second body 63 are located on the same plane. An O-ring 77 is fitted between the outer surface of the lid body 76a and the outer surface of the base portion 75. When the second internal valve 64 is closed, the O-ring 77 seals the space between the lid portion 76 and the second body 63.

[0062] The rear valve 72 has a rear valve body 78 that is formed in the shape of a rod extending in the axial direction. The rear valve body 78 is arranged coaxially with the front valve body 73. With the first joint 2 and the second joint 3 removed, the rear valve body 78 extends from the end of the front valve body 73 opposite to the cover portion 76 to the bottom portion 56a of the spring box 56. That is, the rear valve body 78 is inserted into the check valve insertion hole 55 of the piping body 43 and the through hole 56e of the spring box 56.

[0063] The rear valve body 78 is mounted so as to be axially slidable relative to the piping body 43 and the spring box 56. The space between the rear valve body 78 and the piping body 43 is sealed by an O-ring 58. Therefore, the piping body 43 of the second housing 40 separates the inside of the spring box 56, which houses the compression coil spring 62, from the second valve body passage 68. The outer diameter of the rear valve body 78 is the same as the outer diameter of the front valve body 73. The outer diameter of the rear valve body 78 is sufficiently smaller than the diameter of the reduced diameter inner circumferential surface 51c in the piping body 43. Therefore, even when the rear valve 72 is inserted into the piping body 43, the second central passage 52 is sufficiently maintained.

[0064] A spring base 79 is integrally molded with the portion of the rear valve body 78 that is inserted into the spring box 56, and which protrudes radially outward. The outer diameter of the spring base 79 is slightly smaller than the inner diameter of the peripheral wall portion 56b of the spring box 56. The compression coil spring 62 housed in the spring box 56 is housed in a slightly compressed state between the spring base 79 and the bottom 56a of the spring box 56. As a result, the rear valve 72 is biased toward the first joint 2. The front valve 71 is also biased toward the first joint 2 via the rear valve 72. Therefore, when the first joint 2 and the second joint 3 are removed, the second inner valve 64 is in a closed state.

[0065] <Operation of the joint device> Next, the operation of the joint device 1 will be explained. Figure 5 is a cross-sectional view of the joint device 1, showing the state in which the first joint 2 and the second joint 3 are connected. As shown in Figures 1 and 5, when the first joint 2 and the second joint 3 are separated from each other and removed, each joint 2 and 3 has its internal valves 26 and 64 closed by the compression coil springs 27 and 62 respectively (see Figure 1). When the arms 100a and 100b are brought closer together from this state (see arrows in Figure 1), the outer surface of the guide body 44 of the second guide 42 fits into the inner circumferential surface 18 of the seal of the first guide 7. Then, the space between the first guide 7 and the second guide 42 is sealed by the O-ring 21 provided on the inner circumferential surface 18 of the seal.

[0066] As the arms 100a and 100b are brought closer together, the second guide 42 is pushed into the first guide 7. Then, the tip surface 29b of the slide valve 25 (flange portion 29) and the tip surface 63b of the second body 63 come into contact. At the same time, the tip surface 39b of the first inner valve 26 (lid portion 39) and the tip surface 76b of the second inner valve 64 (lid portion 76) come into contact. Here, the minimum diameter of the inner circumferential surface 63a of the second body 63 is larger than the outer diameter of the counterbore recess 82 in the slide valve 25, and smaller than the inner diameter of the O-ring 92 provided on the slide valve 25. Therefore, the O-ring 92 seals the space between the slide valve 25 and the second body 63.

[0067] In this state, the arms 100a and 100b are brought even closer to each other. As a result, as shown in Figure 5, the second body 63 pushes the slide valve 25 against the spring force of the compression coil spring 27 in the first check valve 5. This causes the tip surface 29b of the slide valve 25 to retract (contract) relative to the tip surface 39b of the first inner valve 26. Therefore, the cover body 39a of the first inner valve 26 is separated from the counterbore recess 82 of the slide valve 25, and a gap is created between the tip surface 29b of the slide valve 25 and the tip surface 39b of the first inner valve 26. In other words, the first valve body passage 35 is opened (hereinafter, this state will be referred to as the open state of the first inner valve 26).

[0068] Meanwhile, the first internal valve 26 pushes the second internal valve 64 against the spring force of the compression coil spring 62 in the second check valve 41. As a result, the tip surface 76b of the second internal valve 64 retracts (decreases) relative to the tip surface 63b of the second body 63. This creates a gap between the tip surface 63b of the second body 63 and the tip surface 76b of the second internal valve 64. In other words, the second valve body passage 68 is closed (hereinafter, this state will be referred to as the open state of the second internal valve 64).

[0069] Then, the O-ring 92 seals the space between the slide valve 25 and the second body 63, while the first valve body passage 35 and the second valve body passage 68 are connected. This completes the connection of the joint device 1, and the external piping (not shown) provided in the first joint 2 and the external piping (not shown) provided in the second joint 3 are connected via the joint device 1. Fluid flows through each external pipe via the joint device 1. Examples of fluids include slurry-like liquids.

[0070] In the first joint 2, the surfaces of each component forming the respective flow paths 14, 23, and 35 (first body 6, pipe socket 8, slide valve 25, and first internal valve 26) are smooth and then polished. In the second joint 3, the surfaces of each component forming the respective flow paths 52, 53, 68, and 74a (pipe body 43, second body 63, and second internal valve 64) are smooth and then polished. These surfaces are further coated to reduce frictional resistance. For example, a fluororesin coating is used. As a result, fluid flows smoothly through each flow path 14, 23, 35, 52, 53, 68, and 74a without stagnation.

[0071] Furthermore, the first housing 4 (guide cylinder portion 10) and the slide valve 25 separate the spring storage recess 11, where the compression coil spring 27 is housed, from the flange portion 29, which is separated from the first valve body passage 35. Therefore, the compression coil spring 27 is not exposed to the fluid. The piping body 43 of the second housing 40 separates the spring box 56, where the compression coil spring 62 is housed, from the second valve body passage 68. Therefore, the compression coil spring 62 is not exposed to the fluid.

[0072] Next, we will explain how to clean the joint device 1. First, let's explain the case where each of the flow paths 14, 23, 35, 52, 53, 68, and 74a is cleaned. In this case, the coupling device 1 is kept connected (see Figure 5). In this state, the first internal valve 26 and the second internal valve 64 are open, and the first valve body flow path 35 and the second valve body flow path 68 are in communication. Therefore, by flowing a cleaning fluid (not shown) through each of the flow paths 14, 23, 35, 52, 53, 68, and 74a all at once, each of the flow paths 14, 23, 35, 52, 53, 68, and 74a is cleaned.

[0073] Incidentally, in the connected state of the coupling device 1, the tip surface 29b of the slide valve 25 and the tip surface 63b of the second body 63 abut against each other, and the tip surface 39b of the first inner valve 26 and the tip surface 76b of the second inner valve 64 abut against each other, thereby connecting the first valve body passage 35 and the second valve body passage 68. As a result, fluid may enter between these tip surfaces 29b, 39b, 63b, and 76b. Therefore, the coupling device 1 cleans each of the tip surfaces 29b, 39b, 63b, and 76b using the end surface cleaning posture described later.

[0074] <End face cleaning position> Figure 6 is a cross-sectional view of the joint device 1, showing the end face cleaning position. As shown in Figure 6, in the end face cleaning position, the arms 100a and 100b of the joint device 1 are slightly separated from each other from their connected state. As a result, the tip surface 29b of the slide valve 25 and the tip surface 63b of the second body 63 are separated while the outer surface of the guide body 44 of the second guide 42 remains fitted to the inner surface 18 of the seal of the first guide 7. At the same time, the tip surface 39b of the first inner valve 26 and the tip surface 76b of the second inner valve 64 are separated. As a result, the slide valve 25 and the second inner valve 64 are pushed back by the restoring force of the compression coil springs 27 and 62, respectively. Then, each joint 2 and 3 becomes closed, with each inner valve 26 and 64 closed.

[0075] Here, the protrusion height H2 of the second body 63 and the seal height H1 of the first guide 7 (see Figures 2 and 4) satisfy the above equation (1). Therefore, in the end face cleaning position of the joint device 1, the first guide 7 and the second guide 42 remain sealed by the O-ring 21. As a result, a cleaning area A is formed, surrounded by the check valves 5, 41, the first guide 7, and the second guide 42, and separated from the outside. Multiple cleaning ports 22 (cleaning inlets 22a, cleaning outlets 22b) are formed on the inner circumferential surface 18 of the seal of the first guide 7 that is exposed in this cleaning area A. By flowing a cleaning liquid (not shown) into the cleaning area A through the cleaning inlets 22a and flowing the cleaning liquid out to the outside through the cleaning outlets 22b, the respective end faces 29b, 39b, 63b, 76b, the inner circumferential surface 18 of the seal, the stepped portion 18a, and the end face 44a of the guide body 44 that are exposed in the cleaning area A are cleaned.

[0076] Here, the position of each cleaning outlet 22b is slightly closer to the second end 7b than the position of each cleaning inlet 22a (see Figure 2). For this reason, for example, when the first joint 2 is positioned above and the second joint 3 is positioned below, as shown in Figure 6, the position of each cleaning outlet 22b is lower than the position of each cleaning inlet 22a. As a result, the cleaning fluid (not shown) that flows into the cleaning area A through the cleaning inlet 22a can be quickly discharged from each cleaning outlet 22b using gravity.

[0077] As described above, in the embodiment described, when connecting the first joint 2 and the second joint 3, the outer surface of the second housing 40 (second guide) is fitted into the inner seal surface 18 of the first housing 4 (first guide 7). An O-ring 21 is provided on the inner seal surface 18 to allow for an end-face cleaning position. In the end-face cleaning position, a cleaning port 22 is provided that connects the gap between the tip surface 29b of the slide valve 25 and the tip surface 63b of the second body 63, and the gap between the tip surface 39b of the first inner valve 26 and the tip surface 76b of the second inner valve 64 (cleaning area A) to the outside of the first housing 4. Therefore, the tip surface 29b of the slide valve 25 and the tip surface 63b of the second body 63 can be separated, and the tip surface 39b of the first inner valve 26 and the tip surface 76b of the second inner valve 64 can be separated, even before completely removing the first joint 2 and the second joint 3.

[0078] In this state, the cleaning area A is isolated from the outside. That is, each end surface 29b, 39b, 63b, 76b, the inner circumferential surface of the seal 18, the stepped portion 18a, and the end surface 44a of the guide body 44 are not exposed to the outside air. The fluid adhering to each end surface 29b, 39b, 63b, 76b, the inner circumferential surface of the seal 18, the stepped portion 18a, and the end surface 44a of the guide body 44 are not exposed to the outside air. Each end surface 29b, 39b, 63b, 76b, the inner circumferential surface of the seal 18, the stepped portion 18a, and the end surface 44a of the guide body 44 can be cleaned in this manner. Therefore, after cleaning each end surface 29b, 39b, 63b, 76b, etc., the outflow of foreign matter due to oxidation of the fluid can be prevented, and malfunctions in other equipment can be prevented.

[0079] Furthermore, the position of each cleaning outlet 22b is slightly shifted closer to the second end 7b than the position of each cleaning inlet 22a (see Figure 2). As a result, the cleaning fluid (not shown) that flows into the cleaning area A via the cleaning inlet 22a can be quickly discharged from each cleaning outlet 22b using gravity.

[0080] In the first joint 2, the surfaces of each component forming the respective flow paths 14, 23, and 35 (first body 6, pipe socket 8, slide valve 25, and first internal valve 26) are smooth and then polished. In the second joint 3, the surfaces of each component forming the respective flow paths 52, 53, 68, and 74a (pipe body 43, second body 63, and second internal valve 64) are smooth and then polished. These surfaces are further coated to reduce frictional resistance. As a result, fluid does not stagnate in each flow path 14, 23, 35, 52, 53, 68, and 74a, and fluid can flow smoothly through each flow path 14, 23, 35, 52, 53, 68, and 74a. This also makes cleaning the joint device 1 easier.

[0081] The spring storage section 81 is separated from the first valve body passage 35 by the first housing 4 (guide cylinder section 10) and the slide valve 25. The space between the spring storage recess 11 where the compression coil spring 27 is housed and the flange section 29 is also separated from the first valve body passage 35. Therefore, with a simple structure, the compression coil spring 27 can be reliably separated from the first central passage 14, the first base passage 23, and the first valve body passage 35. As a result, it is possible to prevent the compression coil spring 27 from being exposed to fluid and to prevent fluid from adhering to the compression coil spring 27.

[0082] As a result, with the first joint 2 and the second joint 3 connected, the first central passage 14, the first base passage 23, and the first valve body passage 35 of the first joint 2 can be thoroughly cleaned. On the other hand, in the end face cleaning position, the first valve body passage 35 is closed. Therefore, during cleaning in the end face cleaning position, it is possible to prevent fluid adhering to the tip surface 29b of the slide valve 25 and the tip surface 39b of the first inner valve 26 from entering the first valve body passage 35. Thus, the joint device 1 can be effectively cleaned.

[0083] The piping body 43 of the second housing 40 separates the spring box 56, which houses the compression coil spring 62, from the second valve body passage 68. This allows for a simple structure that reliably separates the second valve body passage 68 from the compression coil spring 62. As a result, the compression coil spring 62 is prevented from being exposed to the fluid, and the fluid does not adhere to the compression coil spring 62.

[0084] As a result, with the first joint 2 and the second joint 3 connected, the second central passage 52, the side passage 53, and the second valve body passage 68 of the second joint 3 can be thoroughly cleaned. On the other hand, in the end face cleaning position, the second valve body passage 68 is closed. Therefore, during cleaning in the end face cleaning position, it is possible to prevent fluid adhering to the tip surface 63b of the second body 63 and the tip surface 76b of the second internal valve 64 from entering the second valve body passage 68. Thus, the joint device 1 can be effectively cleaned.

[0085] An O-ring 92 is provided on the tip surface 29b of the slide valve 25 (flange portion 29). This O-ring 92 seals the space between the slide valve 25 and the second body 63, which abut when connecting the first joint 2 and the second joint 3. This allows for automatic attachment and detachment of the first joint 2 and the second joint 3, while also preventing the fluid flowing through the first valve body passage 35 and the second valve body passage 68 from being blocked between the slide valve 25 and the second body 63 when connecting them. In other words, it prevents fluid from leaking outside the check valves 5 and 41 when connecting the joint device 1. Therefore, in the end face cleaning position, it is sufficient to clean only the tip surfaces 29b, 39b, 63b, and 76b. Thus, the inside of the joint device 1 can be reliably cleaned, and the remaining fluid can be reliably prevented.

[0086] The present invention is not limited to the embodiments described above, but includes various modifications to the embodiments described above, without departing from the spirit of the invention.

[0087] For example, the above embodiment described a case in which the first joint 2 is attached to the first arm 100a of the automatic attachment / detachment device 100 and the second joint 3 is attached to the second arm 100b. However, it is not limited to this, and the joint device 1 can be applied to various devices. It is also possible to manually attach and detach each joint 2 and 3. The orientation of each joint 2 and 3 can also be any direction.

[0088] In the above-described embodiment, the case in which an O-ring 21 is provided on the inner circumferential surface 18 of the seal of the first guide 7 was explained. However, the invention is not limited to this, and an O-ring 21 may also be provided on the outer circumferential surface of the second guide 42. An O-ring 21 may also be provided on the inner circumferential surface 18 of the seal of the first guide 7 and on the outer circumferential surface of the second guide 42, respectively. In the above-described embodiment, an O-ring 21 was used as the sealing portion to ensure sealing between the first guide 7 and the second guide 42. However, the invention is not limited to this, and the sealing portion only needs to be able to seal the space between the first guide 7 and the second guide 42.

[0089] In the above-described embodiment, the first housing 4 (guide cylinder portion 10) and the slide valve 25 separated the space between the spring housing recess 11, which houses the compression coil spring 27, and the flange portion 29 from the first valve body passage 35. However, the invention is not limited to this, and the compression coil spring 27 may be located in a separate location separated from the first valve body passage 35.

[0090] In the above-described embodiment, the case was explained in which the inside of the spring box 56 housing the compression coil spring 62 is partitioned from the second valve body passage 68 by the piping body 43 of the second housing 40. However, the invention is not limited to this, and the compression coil spring 62 may be located in a separate location separated from the second valve body passage 68. For example, an inner flange protruding radially inward may be provided at the end of the spring box 56 on the piping body 43 side, and this inner flange may partition the inside of the spring box 56 from the second valve body passage 68.

[0091] In the above-described embodiment, the case in which an O-ring 92 is provided on the tip surface 29b of the slide valve 25 (flange portion 29) was explained. This described the case in which the slide valve 25 and the second body 63 are sealed. However, the invention is not limited to this, and an O-ring 92 may also be provided on the tip surface 63b of the second body 63. An O-ring 92 may also be provided on both the tip surface 29b of the slide valve 25 and the tip surface 63b of the second body 63.

[0092] In the above-described embodiment, a case was explained in which a compression coil spring 27 was used as the elastic member that biases the slide valve 25 toward the second joint 3. However, the invention is not limited to this, and the elastic member can be any member that biases the slide valve 25 toward the second joint 3, that is, biases the slide valve 25 in a direction that closes the first valve body passage 35. For example, rubber can be used instead of the compression coil spring 27.

[0093] In the above-described embodiment, a case was explained in which a compression coil spring 62 was used as the elastic member that biases the second internal valve 64 toward the first joint 2. However, the invention is not limited to this, and the elastic member can be any member that biases the second internal valve 64 toward the first joint 2, that is, biases the second internal valve 64 in a direction that closes the second valve body passage 68. For example, rubber can be used instead of the compression coil spring 62.

[0094] Among the embodiments disclosed herein, those composed of multiple objects may be integrated, and conversely, those composed of a single object may be divided into multiple objects. Whether or not they are integrated, the invention can be constructed in a way that achieves its objective. [Explanation of Symbols]

[0095] 1... Joint device 2…First joint 3…Second joint 4…1st Housing 5…First check valve 6…First body (first housing) 7…First Guide (First Housing) 8…Pipe socket (first housing) 10... Guide tube section 11... Spring storage recess 14…First central channel (first channel) 21…O-ring (seal part) 22... Washing port 22a... Wash inlet (wash port) 22b... Wash outlet (wash port) 25... Slide valve 26...First internal valve 27…Compression coil spring (first elastic member) 28...Slide valve body (slide valve) 29…Flange section (slide valve) 29b...Tip surface (first opposing surface) 35…First valve body flow path (first flow path) 38a...Tip surface (first opposing surface) 40...Second Housing 41... Second check valve 42…Second Guide (Second Housing) 43…Piping body (second housing) 43a...bottom (wall) 52…Second Central Channel (Second Channel) 53... Side channel (second channel) 56... Spring box (Second elastic member storage section) 62... Compression coil spring (second elastic component) 63...Second body (body) 64...Second internal valve 68...Second valve body flow path (second flow path) 74a...Flange channel (second channel) 76b...Tip surface (second opposing surface) 81... Spring storage section (first elastic member storage section) A... Cleaning area (gap)

Claims

1. First joint and, A second joint is positioned opposite the first joint and is attached to and detached from the first joint by moving closer to and further away from the first joint, Equipped with, The first joint is, A cylindrical first housing whose direction opposite to the second joint is axial, A first check valve is housed within the first housing and forms a first flow path, and opens and closes the first flow path. Equipped with, The aforementioned second fitting is, A cylindrical second housing fitted to the inner circumferential surface of the first housing, A second check valve is housed within the second housing and forms a second flow path, and opens and closes the second flow path. Equipped with, The first joint and the second joint are connected such that the first opposing surface of the first check valve to the second check valve and the second opposing surface of the second check valve to the first check valve abut against each other, at which point the first and second passages are opened and the first and second passages are connected. A sealing portion is provided in at least one of the first housing and the second housing to ensure a seal between the first housing and the second housing when they are fitted together. The sealing portion is positioned where the first housing and the second housing are fitted together with the first opposing surface and the second opposing surface separated from each other. The first housing is provided with a cleaning port that connects the gap between the first opposing surface and the second opposing surface to the outside of the first housing when the first housing and the second housing are fitted together at the position of the sealing portion. Joint device.

2. The first check valve is, A cylindrical slide valve is provided in the first housing so as to be slidable in the axial direction, A first internal valve housed within the slide valve and whose movement relative to the first housing is restricted, A first elastic member housed in a first elastic member housing provided between the first housing and the slide valve, Equipped with, The end faces of the slide valve and the first internal valve, each on the second joint side, each include the first opposing surface. The first flow path is formed between the slide valve and the first internal valve, The sliding movement of the slide valve opens and closes the first flow path. The first elastic member is positioned at a location separate from the first flow path and biases the slide valve in a direction that closes the first flow path. The joint device according to claim 1.

3. The first housing and the slide valve separate the first flow path and the first elastic member housing. The joint device according to claim 2.

4. The aforementioned second check valve is A cylindrical body is positioned coaxially with the axial direction of the second housing and whose movement relative to the second housing is restricted, A second internal valve is housed within the body and is provided to be slidable in the axial direction of the body, A second elastic member housed inside a second elastic member housing section provided on the side of the second housing opposite to the first joint, Equipped with, The end faces of the body and the second internal valve on the first joint side each include the second opposing surface. The second flow path is formed between the body and the second internal valve. The second flow path is opened and closed by the sliding movement of the second internal valve. The second elastic member is positioned at a location separate from the second flow path and biases the second internal valve in a direction that closes the second flow path. The joint device according to claim 1.

5. The second flow path and the interior of the second elastic member storage section are separated by at least one of the walls of the second housing and the second elastic member storage section. The joint device according to claim 4.

6. The first check valve is, A cylindrical slide valve is provided in the first housing so as to be slidable in the axial direction, A first internal valve housed within the slide valve and whose movement relative to the first housing is restricted, A first elastic member housed in a first elastic member housing provided between the first housing and the slide valve, Equipped with, The end faces of the slide valve and the first internal valve, each on the second joint side, each include the first opposing surface. The first flow path is formed between the slide valve and the first internal valve, The sliding movement of the slide valve opens and closes the first flow path. The first elastic member biases the slide valve in a direction that closes the first flow path, The aforementioned second check valve is A cylindrical body is positioned coaxially with the axial direction of the second housing and whose movement relative to the second housing is restricted, A second internal valve is housed within the body and is provided to be slidable in the axial direction of the body, A second elastic member housed inside a second elastic member housing section provided on the side of the second housing opposite to the first joint, Equipped with, The end faces of the body and the second internal valve on the first joint side each include the second opposing surface. The second flow path is formed between the body and the second internal valve. The second flow path is opened and closed by the sliding movement of the second internal valve. The second elastic member biases the second internal valve in a direction that closes the second flow path, An end face sealing portion is provided on at least one of the first opposing surface of the slide valve and the second opposing surface of the body, which seals the space between the slide valve and the body when the slide valve and the body are in contact with each other. The joint device according to any one of claims 1 to 5.

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