阅读说明：本技术 用于输送流体的连接器 (Connector for conveying fluid ) 是由 莲沼正裕 于 2020-01-22 设计创作，主要内容包括：本发明的目的是能够抑制或防止插头与插座相互连接时产生的插头前端损伤,并且可提高插座内部的可维护性。用于输送流体的连接器包括设置在流体管的端部的公形金属制插头、以及可供插头插入且与插头连接时流体连通的母形插座100,插座100具有截面圆形状的容纳部11,在插头与插座100的连接状态下容纳插头的前端部,容纳部11具有金属制的阀体支架40b及合成树脂制的筒部12,该合成树脂制的筒部12设置在阀体支架40b的内侧,在插头与插座100的连接状态下配置在插头的前端部与阀体支架40b之间。(The invention aims to inhibit or prevent damage of a plug front end generated when a plug and a socket are connected with each other and improve maintainability of the socket interior. The connector for conveying fluid comprises a male metal plug provided at an end of a fluid pipe and a female socket 100 into which the plug can be inserted and which is in fluid communication when connected to the plug, wherein the socket 100 has a receiving portion 11 having a circular cross section for receiving a distal end portion of the plug in a connected state of the plug and the socket 100, the receiving portion 11 has a metal valve body holder 40b and a synthetic resin cylinder portion 12, and the synthetic resin cylinder portion 12 is provided inside the valve body holder 40b and is disposed between the distal end portion of the plug and the valve body holder 40b in the connected state of the plug and the socket 100.)

1. A connector for conveying a fluid, comprising:

a male metal plug provided at an end of the fluid pipe; and

a female socket into which the plug is inserted and which is in fluid communication when connected to the plug;

the receptacle has a receiving portion having a circular cross-section and receiving a tip portion of the plug in a connected state of the plug and the receptacle;

the accommodating portion has:

a metal body portion; and

and a synthetic resin tube portion provided inside the main body portion and disposed between the tip portion of the plug and the main body portion in a connected state of the plug and the receptacle.

2. The connector for transporting fluid according to claim 1, wherein a first groove for accommodating an O-ring is formed in an inner peripheral surface of the cylinder portion, and the O-ring accommodated in the first groove contacts the cylinder portion and the plug in a connected state of the plug and the socket.

3. The connector for transporting fluid according to claim 2, wherein a second groove is formed in an inner peripheral surface of the cylindrical portion, the second groove being parallel to an axial direction of the cylindrical portion and connecting the first groove.

4. The connector for transporting fluid according to any one of claims 1 to 3, wherein a third groove is formed in an inner peripheral surface of the cylindrical portion, the third groove being parallel to an axial direction of the cylindrical portion and having a plane intersecting with a circumferential direction.

5. The connector for transporting fluid according to any one of claims 1 to 3, further comprising a nozzle provided in the housing portion and adapted to spray a cleaning liquid toward the housing portion,

the cylindrical portion is formed with a through hole through which the nozzle can be inserted.

6. The connector for transporting fluid according to any one of claims 1 to 3, wherein the cylindrical portion is fixed to the main body portion by press fitting, by a C-ring inserted into a fourth groove formed in an inner peripheral surface of the main body portion, or by screwing.

7. A connector for transporting fluid according to any one of claims 1 to 3, wherein the barrel portion is constituted by one integral member or by a plurality of constituent parts.

Technical Field

The present invention relates to a connector for conveying fluids.

Background

A connector for transporting a fluid is a device that connects two different piping systems, for example, for transporting a fluid (e.g., a chemical solution, a gas, or the like) used in a semiconductor manufacturing apparatus from one place to another place. A connector for transporting a fluid comprising: a socket, for example, fixedly installed at one side of a building, in which a buffer tank for temporarily storing a fluid is provided; and a plug fixed to the tip of a fluid pipe such as a hose led out from the tank car. The socket is connected with a fluid pipe connected with the buffer tank.

Fluid can be delivered from the tanker to the buffer tank or from the buffer tank to the tanker by interconnecting the receptacle with the plug.

In a connector for transporting fluid, after a male plug is inserted into an insertion opening of a socket side and fixed, a female socket body is moved to the plug side by an operation of an internal mechanism. Then, by the connection of the plug and the socket main body, the socket-side fluid pipe and the plug-side fluid pipe communicate with each other.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a connector for transporting a fluid, which can prevent or suppress damage to the tip of a plug when the plug and a receptacle are connected to each other, and can improve maintainability inside the receptacle.

In order to solve the above problems, the connector for transporting fluid of the present invention employs the following means.

The connector for transporting fluid of the present invention comprises: a male metal plug provided at an end of the fluid pipe; the female socket can be inserted by the plug and is communicated with fluid when connected with the plug; the receptacle has a receiving portion having a circular cross-section and receiving a distal end portion of the plug in a connected state of the plug and the receptacle, and the receiving portion has a metal body portion and a synthetic resin tube portion, the synthetic resin tube portion being provided inside the body portion and disposed between the distal end portion of the plug and the body portion in the connected state of the plug and the receptacle.

According to this configuration, the male metal plug is provided at the end of the fluid pipe, and the female socket into which the male metal plug can be inserted communicates with the fluid when the male metal plug is connected to the female metal plug. The receptacle has an accommodating portion in which a front end portion of the plug is accommodated in a connected state of the plug and the receptacle. The accommodating portion has a metal main body portion and a synthetic resin cylindrical portion provided inside the main body portion. The cylindrical portion is disposed between the distal end portion of the plug and the main body portion in a connected state of the plug and the receptacle. Thus, even if the tip of the plug slides while maintaining contact with the inner peripheral surface of the receptacle when the plug and the receptacle are connected to each other, the tip of the plug is not in contact with the metal body but with the synthetic resin tube, and therefore the tip of the plug is less likely to be damaged. Further, since the cylindrical portion and the main body portion are separate members, they have a structure detachable from the main body portion. Therefore, even if the receptacle of the receptacle is damaged by contact with the plug, the barrel portion can be replaced, and the maintainability is improved.

In the above invention, the inner peripheral surface of the cylindrical portion may be formed with a first groove for accommodating an O-ring, and the O-ring accommodated in the first groove may contact the cylindrical portion and the plug in a state where the plug and the socket are connected.

According to this configuration, the first groove is formed in the inner peripheral surface of the cylindrical portion, and the O-ring is accommodated in the first groove. The O-ring accommodated in the first groove contacts the cylindrical portion and the plug in a connected state of the plug and the socket. This improves the sealing property between the outer peripheral surface of the plug and the inner peripheral surface of the socket. Further, unlike the case where the groove for accommodating the O-ring is directly formed in the metal body portion, the first groove for accommodating the O-ring can be reconstructed by replacing the cylindrical portion, and thus the maintainability is improved.

In the above invention, a second groove may be formed in an inner peripheral surface of the cylindrical portion, the second groove being parallel to an axial direction of the cylindrical portion and being connected to the first groove.

According to this configuration, the second groove is formed on the inner peripheral surface of the cylindrical portion so as to be parallel to the axial direction of the cylindrical portion, and the second groove is connected to the first groove for accommodating the O-ring. Thus, for example, the rod-like member can be inserted into the second groove, and the tip of the rod-like member can reach the O-ring housed in the first groove.

In the above description, the inner peripheral surface of the cylindrical portion may be formed with a third groove having a plane parallel to the axial direction of the cylindrical portion and intersecting with the circumferential direction.

According to this configuration, the third groove is formed on the inner peripheral surface of the cylindrical portion so as to be parallel to the axial direction of the cylindrical portion, and the third groove has a plane intersecting the circumferential direction. Thus, the rod-like member can be provided in the third groove, the side surface of the rod-like member can be brought into contact with the plane intersecting the circumferential direction of the third groove, and the cylindrical portion can be rotated in the circumferential direction using the rod-like member. Therefore, after the cylindrical portion is inserted into the main body portion, the circumferential positioning of the cylindrical portion becomes easy.

In the above description, the cleaning device further includes a nozzle provided in the housing portion and configured to spray the cleaning liquid into the housing portion, and the cylindrical portion has a through hole through which the nozzle can pass.

According to this configuration, the nozzle is provided through the through hole of the cylindrical portion and is provided in the housing portion. The nozzle can spray cleaning liquid to the containing part, and the cleaning liquid can be used for cleaning the front end of the plug and the containing part. Further, since the nozzle is provided so as to penetrate the through hole of the cylindrical portion, the axial movement and circumferential rotation of the cylindrical portion can be suppressed by the nozzle, and the cylindrical portion is less likely to fall off from the main body.

In the above description, the cylindrical portion may be press-fitted and fixed to the body portion, or may be fixed to the body portion by a C-ring inserted into a fourth groove formed in an inner peripheral surface of the body portion, or may be fixed to the body portion by screwing.

According to this configuration, the cylindrical portion is press-fitted into the main body portion and fixed, and thus, it is not necessary to use other parts for fixing, and the cylindrical portion can be attached to and detached from the main body portion relatively easily. Further, positioning in the circumferential direction is easier than fixing by screwing. Further, the cylindrical portion is not easily removed from the body portion in the axial direction by being fixed by the C-ring inserted into the fourth groove formed in the inner peripheral surface of the body portion or by being screwed to the body portion.

In the above description, the cylindrical portion may be formed of a single integral member or may be formed of a plurality of constituent parts.

According to this configuration, when the cylindrical portion is formed of one integral member, the rigidity of the cylindrical portion can be improved. Further, when the tube portion is formed of a plurality of constituent parts, the tube portion can be easily manufactured or can be easily attached to the main body portion.

According to the present invention, it is possible to suppress or prevent loss of the tip of the plug generated when the plug and the receptacle are connected to each other, and to improve maintainability inside the receptacle.

Drawings

Fig. 1 is a longitudinal sectional view showing a connector for fluid transfer according to an embodiment of the present invention, showing a state in which a receptacle is connected to a plug.

Fig. 2 is a longitudinal sectional view showing a socket of a connector for fluid transfer according to an embodiment of the present invention, showing a state in which a moving portion is moved to a first opening portion side.

Fig. 3 is a longitudinal sectional view showing a socket of a connector for fluid transfer according to an embodiment of the present invention, showing a state in which a moving portion is moved to a second opening portion side.

Fig. 4 is a cross-sectional view showing a socket of a connector for fluid transfer according to an embodiment of the present invention, which is cut at a position where a spray nozzle is provided.

Fig. 5 is a front view showing a tube portion according to an embodiment of the present invention.

Fig. 6 is a longitudinal sectional view showing a cylindrical portion according to an embodiment of the present invention.

Fig. 7 is a partially enlarged vertical sectional view showing a housing according to an embodiment of the present invention.

Fig. 8 is a partially enlarged vertical cross-sectional view showing a first modification of the housing portion according to the embodiment of the present invention.

Fig. 9 is a partially enlarged vertical cross-sectional view showing a second modification of the housing portion according to the embodiment of the present invention.

Fig. 10 is a partially enlarged vertical cross-sectional view showing a first modification of the tube portion according to the embodiment of the present invention.

Fig. 11 is a partially enlarged vertical cross-sectional view showing a second modification of the tube portion according to the embodiment of the present invention.

Description of reference numerals:

connector for conveying fluids

10 outer shell part

11 accommodating part

12 barrel part

13O-ring housing groove

14O-ring replacement groove

15 alignment groove

16 through hole

17 external screw thread

20. 201 valve body

20a, 202 valve body

20b spring

20c stop

20d orifice

20e, 21, 40d O ring

22 nozzle for cleaning

30 bellows part

30a front end portion

30b corrugated pipe body

Proximal end portion of 30c

31 supply flow path

40 moving part

40a corrugated pipe support

40b valve body support

40c circular ring shaped protrusion

41 first valve seat

42 through hole

43 recess

44C-shaped ring groove

45 internal thread

50C shaped ring

80. 81 air supply and exhaust port

90. 91, 92, 93 fastening bolt

95 shaft

100 socket

100a first opening part

100b second opening part

200 plug

300. 400 fluid pipe

P1 first pressure chamber

P2 second pressure chamber

X axis

Detailed Description

Hereinafter, an embodiment of a connector 1 for transporting fluid of the present invention will be described with reference to the drawings.

As shown in fig. 1, a connector 1 for transporting fluid according to an embodiment of the present invention includes: a socket 100 fixedly provided on, for example, a building side; and a plug 200 fixed to the tip of a fluid pipe 400 such as a hose. By the mutual connection of the socket 100 and the plug 200, the connector 1 for transporting fluid can be circulated with a non-compressive fluid. The incompressible fluid according to the present embodiment is, for example, a liquid such as deionized water or a chemical solution used in a semiconductor manufacturing apparatus.

The socket 100 is connected to a fluid pipe 300 connected to a buffer tank provided in a building, for example. The plug 200 is fixed to the tip of a fluid pipe 400 such as a hose led out from a tank truck.

The socket 100 of the present embodiment will be described in more detail below.

As shown in fig. 1 to 3, the socket 100 includes a housing portion 10, a valve body portion 20, a bellows portion 30, a moving portion 40, and the like.

The housing portion 10 is a member formed in a cylindrical shape along the axis X. The housing 10 has a first opening 100a and a second opening 100 b. The first opening 100a is formed along the axis X at one end of the socket 100, and the plug 200 is inserted into the first opening 100 a. The second opening 100b is formed on the other end side of the socket 100 along the axis X, and the fluid pipe 300 is connected to the second opening 100 b.

As shown in fig. 2, the housing portion 10 includes a first housing portion 10a, a second housing portion 10b, a third housing portion 10c, and a fourth housing portion 10d in this order from the first opening portion 100a side along the axis X. Further, a front cover 10e is disposed on the first opening 100a side of the first casing 10a, and a rear cover 10f is disposed on the second opening 100b side of the fourth casing 10 d. Further, an annular side flange 10g extending along the axis X is disposed between the first housing portion 10a and the second housing portion 10 b.

The front cover 10e is fixed to the first housing portion 10a at a plurality of locations around the axis X by fastening bolts 90. The first housing portion 10a is fastened to the side flange 10g at a plurality of locations around the axis X by fastening bolts 91. The side flange 10g is fastened to female threads formed on the inner circumferential surface of the shaft 95 at a plurality of locations around the axis X by fastening bolts 92. The rear cover 10f is fastened to female screws formed on the inner peripheral surface of the shaft 95 at a plurality of locations around the axis X by fastening bolts 93.

The shafts 95 are inserted into insertion holes formed in the second, third, and fourth casing sections 10b, 10c, and 10d at a plurality of positions around the axis X. The second housing section 10b, the third housing section 10c, and the fourth housing section 10d are integrated by fastening the fastening bolt 92 to one end of the shaft 95 from the side flange 10g side and fastening the fastening bolt 93 to the other end of the shaft 95 from the rear cover 10f side. Further, adjacent parts of the first, second, third, and fourth casing portions 10a, 10b, 10c, and 10d are fitted to each other by a socket structure. That is, an annular convex portion sharing a central axis is formed on one of the housing portions, an annular concave portion sharing a central axis is formed on the other housing portion, and the convex portion and the concave portion are formed so as to be capable of fitting with each other. Thus, the central axes of the first, second, third, and fourth casing sections 10a, 10b, 10c, and 10d can be aligned.

As described above, the first casing section 10a, the second casing section 10b, the third casing section 10c, and the fourth casing section 10d are integrally connected to each other, and form a cylindrical flow path therein, so that the incompressible fluid flows from the first opening 100a to the second opening 100 b.

The valve body portion 20 is brought into an open state in which the incompressible fluid can flow between the plug 200 and the housing portion 10 by contacting the plug 200. As shown in fig. 2, the valve body 20 includes a valve main body 20a, a spring 20b, and a stopper 20 c.

The valve main body 20a is formed with a cross-sectionally circular orifice 20d for restricting the flow rate of the incompressible fluid flowing in the valve main body 20 a. The orifices 20d are arranged at equal intervals at a plurality of positions around the axis X.

The valve main body 20a has a cylindrical outer peripheral surface extending along the axis X, and has an outer peripheral surface slightly smaller than an inner peripheral surface of a valve body holder 40b described later. Therefore, the valve main body 20a can move along the axis X in a state of being inserted into the internal space of the valve body holder 40 b.

The stopper 20c is an annular member extending around the axis X, and is fixed to the valve body holder 40b by fastening a male screw portion formed on the outer peripheral surface to a female screw portion formed on the inner peripheral surface of the valve body holder 40 b.

The stop 20c serves to retain a spring 20b, which spring 20b extends along the axis X between the stop 20c and the valve body 20 a. A first valve seat 41 protruding inward is formed near the center of the valve body holder 40 b. The valve main body 20a is pressed against the first valve seat 41 by the expansion energizing force of the spring 20b, thereby closing the opening portion of the first valve seat 41. At this time, an annular seal region extending around the axis X is formed between the valve main body 20a and the first valve seat 41.

In the state shown in fig. 2 and 3, the O-ring 20e attached to the valve body 20a contacts the inner peripheral surface of the valve body holder 40b to form a seal region, and therefore, the first opening portion 100a and the second opening portion 100b are blocked from flowing a non-compressible fluid.

The bellows portion 30 is a member in which an expandable supply channel 31 through which an incompressible fluid flows is formed. The bellows portion 30 is disposed between the valve body 20 and the fluid pipe 300 inside the housing portion 10.

As shown in fig. 2, the bellows portion 30 includes a tip portion 30a, a bellows main body 30b, and a base end portion 30c in this order from the first opening portion 100a side along the axis X. The distal end portion 30a, the bellows main body 30b, and the proximal end portion 30c are integrally formed of a fluororesin material (e.g., PTFE).

The distal end portion 30a is an annular member extending around the axis X, and is fixed to the stopper 20c by fastening a male screw portion formed on the outer peripheral surface to a female screw portion formed on the inner peripheral surface of the stopper 20c on the second opening 100b side.

The base end portion 30c is a cylindrical member extending around the axis X, and is held between the back cover 10f and the fourth housing portion 10 d.

The bellows main body 30b is formed in an extensible and retractable bellows shape along the axis X. The front end portion 30a is movable along the axis X together with the stopper 20c and the valve body holder 40 b. On the other hand, the proximal end portion 30c is disposed in a state of being fixed to the housing portion 10. As described above, the distance between the distal end portion 30a and the proximal end portion 30c in the axis X direction varies depending on the position of the moving portion 40, and the bellows main body 30b has a bellows shape. Therefore, the supply passage 31 formed inside the bellows portion 30 can expand and contract along the axis X.

The moving portion 40 is a member that can move along the axis X and come into contact with or separate from the plug 200 provided in the first opening 100a of the receptacle 100. The moving portion 40 is a member that is formed in a cylindrical shape along the axis X and accommodates the valve body portion 20 and the bellows portion 30 therein. As shown in fig. 2, the moving portion 40 includes a valve body holder 40b and a bellows holder 40a in this order from the first opening portion 100a side along the axis X.

The outer peripheral surface of the valve body holder 40b on the second opening portion 100b side is formed with male threads, and the inner peripheral surface of the bellows holder 40a on the first opening portion 100a side is formed with female threads. The valve body holder 40b is integrated with the bellows holder 40a by fastening the external thread of the valve body holder 40b and the internal thread of the bellows holder 40 a.

An annular protrusion 40c extending along the axis X is formed on the outer peripheral portion of the end portion of the bellows holder 40a on the first opening 100a side. The annular protrusion 40c is disposed in a cylindrical space between the third casing 10c and the fourth casing 10d so as to divide the space into a first pressure chamber P1 and a second pressure chamber P2. The annular protrusion 40c contacts the inner peripheral surface of the third housing portion 10c via the O-ring 40 d.

The first pressure chamber P1 is a space formed between the side surface of the annular protrusion 40c on the first opening 100a side (one end side) and the inner peripheral surface of the third housing 10c, and the air supply/exhaust port 80 is connected through a through hole formed in the outer peripheral surface of the third housing 10 c.

The second pressure chamber P2 is a space formed between the side surface of the annular projection 40c on the second opening 100b side (the other end side) and the inner circumferential surface of the third housing 10c, and the air supply/exhaust port 81 is connected through another through hole formed in the outer circumferential surface of the third housing 10 c.

When compressed air (operation gas) is supplied into the first pressure chamber P1 through the supply pipe, a biasing force is generated to move the annular protrusion 40c toward the second opening 100b along the axis X. This energizing force is an energizing force in a direction to contract the bellows main body 30b of the bellows portion 30.

As shown in fig. 3, when the first pressure chamber P1 expands and the second pressure chamber P2 contracts due to the energizing force generated by the first pressure chamber P1, the moving portion 40 moves toward the second opening portion 100 b. Therefore, when the plug 200 is inserted into the first opening portion 100a, the moving portion 40 is separated from the plug 200.

When compressed air (operation gas) is supplied into the second pressure chamber P2 through the supply pipe, a biasing force is generated to move the annular protrusion 40c toward the first opening 100a along the axis X. This energizing force is an energizing force in a direction in which the bellows main body 30b of the bellows portion 30 is extended.

As shown in fig. 1 and 2, when the second pressure chamber P2 is expanded and the first pressure chamber P1 is contracted due to the energizing force generated by the second pressure chamber P2, the moving portion 40 moves toward the first opening 100 a. Therefore, as shown in fig. 1, when the plug 200 is inserted into the first opening portion 100a, the moving portion 40 contacts the plug 200.

As shown in fig. 1, when the moving portion 40 contacts the plug 200, the front end of the valve body 202 of the valve body 201 of the plug 200 contacts the front end of the valve body 20a of the valve body 20, and the valve body 20a is separated from the inner peripheral surface of the moving portion 40. This allows the non-compressed fluid to flow between the valve body 201 of the plug 200 and the supply passage 31 formed inside the bellows portion 30.

As shown in fig. 2 and 3, a housing portion 11 having a circular cross section is formed inside the valve body holder 40b on the first opening portion 100a side. The housing 11 is formed on the valve body 20 side further inward than the inlet of the first opening 100a of the socket 100, and has a circular cross section. The front end portion of the plug 200 is accommodated in the accommodating portion 11. The housing 11 is composed of a metal valve body holder 40b and a synthetic resin tube 12. The accommodating portion 11 is provided with a cylindrical portion 12 inside the valve body holder 40 b.

The valve body holder 40b is made of metal, for example, stainless steel, and has a cylindrical surface with a circular cross section on the inside of which the cylindrical portion 12 is formed. The cylindrical portion 12 is made of, for example, polytetrafluoroethylene and is made of a low-friction material. Thereby, the metal plug 200 contacting the inner circumferential surface of the tube portion 12 smoothly moves along the inner circumferential surface of the tube portion 12.

As shown in fig. 1, the cylindrical portion 12 is disposed between the distal end portion of the plug 200 and the valve body holder 40b in the connected state of the plug 200 and the socket 100. The cylindrical portion 12 is a cylindrical member, and the outer peripheral surface of the cylindrical portion 12 is provided to contact the inner peripheral surface, which is the cylindrical surface of the valve body holder 40 b. The tip of the plug 200 is inserted into the inner circumferential surface of the tube 12. The inner circumferential surface of the cylindrical portion 12 is arranged to contact the outer circumferential surface of the plug 200.

The cylindrical portion 12 has a length (length in the direction of the axis X) that covers the distal end portion of the plug 200, for example, a small-diameter portion (diameter-reduced portion) of the plug 200 when the plug 200 is connected to the receptacle 100. Thus, the portion of the plug 200, which is likely to contact the inner peripheral surface of the receptacle 100 at the distal end thereof, is covered with the tube 12. Further, the cylindrical portion 12 is desirably long in the direction of the axis X so that the tip end portion of the plug 200 can be accommodated in a large area without stress concentration in the connected state of the plug 200 and the receptacle 100.

In the present embodiment, by providing the cylindrical portion 12, even if the tip of the plug 200 slides while maintaining contact with the inner peripheral surface of the socket 100 when the plug 200 and the socket 100 are connected to each other, the tip of the plug 200 does not contact the metal valve body holder 40b but contacts the synthetic resin cylindrical portion 12. As a result, the front end of the plug 200 is less likely to be damaged.

As shown in fig. 6, an O-ring housing groove (first groove) 13 for housing an O-ring 21 (see fig. 1 to 3) is formed on the inner circumferential surface of the cylindrical portion 12. The O-ring 21 accommodated in the O-ring accommodating groove 13 contacts the cylindrical portion 12 and the plug 200 in the connected state of the plug 200 and the receptacle 100, and therefore, the sealing property between the outer peripheral surface of the plug 200 and the inner peripheral surface of the receptacle 100 is improved. Further, when the O-ring accommodating groove 13 is broken or the like, the O-ring accommodating groove 13 can be reconstructed by replacing the tube portion 12. Therefore, unlike the case where the O-ring housing groove 13 is directly formed in the metal valve body holder 40b, when the O-ring housing groove 13 is formed in the inner peripheral surface of the cylindrical portion 12, the maintainability of the socket 100 is improved.

As shown in fig. 5 and 6, an O-ring replacement groove (second groove) 14 is formed on the inner circumferential surface of the tube portion 12 in parallel with the axial direction of the tube portion 12. The O-ring replacement groove 14 connects the O-ring housing groove 13. Thus, for example, a rod-like member (not shown) can be inserted into the O-ring replacement groove 14, and the tip of the rod-like member can reach the O-ring 21 housed in the O-ring housing groove 13, so that the O-ring 21 can be easily removed by using the rod-like member.

As shown in fig. 5 and 6, an alignment groove (third groove) 15 parallel to the axial direction of the tube portion 12 is formed in the inner peripheral surface of the tube portion 12. The alignment groove 15 has a plane (standing surface 15a) intersecting the circumferential direction. The standing surfaces 15a of the alignment groove 15 face each other by, for example, U-shaped cutting of the inner peripheral surface of the tube portion 12.

Thus, a jig (not shown) is provided in the alignment groove 15, and the cylindrical portion 12 can be rotated in the circumferential direction by the jig while abutting the jig against the standing surface 15a intersecting with the circumferential direction of the alignment groove 15. Therefore, after the tube portion 12 is inserted into the valve body holder 40b, the circumferential positioning of the tube portion 12 becomes easy.

As shown in fig. 4 and 6, the cylindrical portion 12 is formed with a through hole 16 through which the cleaning nozzle 22 can be inserted. Thus, the cleaning nozzle 22 is inserted through the through hole 16 provided in the cylindrical portion 12 and is provided in the housing portion 11. As shown in fig. 4, the valve body holder 40b is formed with a through hole 42 into which the cleaning nozzle 22 can be inserted and fixed. The cleaning nozzle 22 is configured to be detachable from the valve body holder 40b and the cylinder 12.

The cleaning nozzle 22 can spray a cleaning liquid into the housing portion 11, and the inside of the housing portion 11 and the tip of the plug 200 can be cleaned with the cleaning liquid. Further, as shown in fig. 4, since the tip of the cleaning nozzle 22 penetrates the through hole 16 provided in the tubular portion 12, the movement of the tubular portion 12 in the axis X direction and the rotation in the circumferential direction are suppressed by the tip of the cleaning nozzle 22, and the tubular portion 12 is less likely to come off from the valve body holder 40 b.

The inner peripheral surface of the housing portion 11 is tapered from the O-ring 21 toward the first opening 100 a. Further, the first casing section 10a is formed with discharge holes (not shown) extending from the inner peripheral surface to the outer peripheral surface, and the cleaning liquid ejected from the cleaning nozzle 22 is discharged from the discharge holes.

The tube portion 12 is fixed to the valve body holder 40b by press fitting. This eliminates the need to fix the cylinder portion 12 to the valve body holder 40b using other parts such as a C-ring. Further, the circumferential positioning becomes easier than in the case of screw fixation.

As shown in fig. 7, a projection 12a may be formed on the outer peripheral surface of the tube 12. The protrusion 12a is formed in a band shape along the circumferential direction and fitted into a recess 43 formed in the inner circumferential surface of the valve body holder 40 b. This suppresses the projection 12a and the recess 43 from fitting together, and the cylindrical portion 12 is less likely to come off the valve body holder 40 b.

The fixation of the tube portion 12 to the valve body holder 40b is not limited to press fitting, and as shown in fig. 8, the tube portion 12 may be fixed by a C-ring 50 inserted into a C-ring groove (fourth groove) 44 formed in the inner peripheral surface of the valve body holder 40 b. The C-ring groove 44 is formed outside the end of the cylinder portion 12 on the first opening 100a side provided in the valve body holder 40 b. The C-ring 50 inserted into the C-ring groove 44 is disposed so as to contact the end of the cylinder portion 12. As shown in fig. 9, the tube portion 12 may be screwed to the valve body holder 40 b. That is, the cylindrical portion 12 is fixed to the valve body holder 40b by screwing the male screw 17 formed on the outer peripheral surface of the cylindrical portion 12 into the female screw 45 formed on the inner peripheral surface of the valve body holder 40 b. This makes it difficult for the tube portion 12 to come off from the valve body holder 40b in the axial direction.

The cylindrical portion 12 may be formed of a single integral member or may be formed of a plurality of portions (constituent parts). The cylindrical portion 12 formed of one integral member has high rigidity. As shown in fig. 10 and 11, when the cylindrical portion 12 is formed of a plurality of constituent parts (for example, constituent parts 12A, 12B, 12C, and 12D), the cylindrical portion 12 can be easily manufactured and the valve body holder 40B can be easily attached. For example, as shown in fig. 10 and 11, the O-ring accommodation groove 13 on the inner peripheral surface can be easily formed by dividing the constituent components 12A and 12B, the constituent components 12A and 12C, and the constituent components 12C and 12D at the O-ring accommodation groove 13. Further, by dividing the component into a plurality of components, the component that needs to be replaced may be replaced.

As described above, according to the present embodiment, the male metal plug 200 is provided at the end of the fluid tube 400, and the female socket 100 into which the plug 200 is inserted communicates with the fluid when the plug 200 is connected. The receptacle 100 has a housing 11, and the front end of the plug 200 is housed in the housing 11 in a state where the plug 200 is connected to the receptacle 100. The housing 11 includes a metal valve body holder 40b and a synthetic resin tube 12 provided inside the valve body holder 40 b. The cylindrical portion 12 is disposed between the distal end portion of the plug 200 and the valve body holder 40b in the connected state of the plug 200 and the socket 100. Thus, when the plug 200 and the socket 100 are connected to each other, even if the tip of the plug 200 slides while maintaining contact with the inner peripheral surface of the socket 100, the tip of the plug 200 does not contact the metal valve body holder 40b but contacts the synthetic resin tube 12, and therefore, the tip of the plug 200 is less likely to be damaged. As a result, the sealing performance between the outer peripheral surface of the plug 200 and the inner peripheral surface of the socket 100 is not lowered, and thus problems such as leakage of the flowing fluid are unlikely to occur.