JP2017133618A - Socket, plug, and connection structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a socket, a plug, and a connection structure of them capable of preventing leakage of fluid better than ever before even if connection and separation are frequently repeated, and even if pressure of about 4 MPa, for example, is loaded at the time of connection.SOLUTION: A socket 1 that can be connected to a plug with a cylindrical engagement part having a side surface part includes: a housing part 10 that receives the engagement part detachably along a longitudinal direction of the engagement part; and washers 16, 17, and 18 having a plurality of annular bodies 16a, 17a, and 18a of a material whose compression strength is 4 MPa or more when deformed by 5% provided along a longitudinal direction of the housing part in the inner peripheral part of the housing part, and annular elastic bodies 16b, 17b, and 18b formed over an entire periphery at least in the vicinity on the inner peripheral side of the annular bodies. In at least one of the plurality of washers, the annular elastic body forms an annular sliding contact part that is brought into sliding contact with an entire periphery in a circumferential direction of the side surface part of the plug.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a socket, a plug, and a connection structure between the socket and the plug.

  Conventionally, this kind of socket, plug, and connection structure of the socket and plug are used for a cap part of a fuel tank, a joint part of a pipe through which a fluid such as hot water passes, a combustion gas seal part of an engine of an automobile, etc. Widely used. In such applications, a sealing elastic member (hereinafter sometimes referred to as a seal member) is generally used in order to prevent fluid leakage from the connection portion between the socket and the plug.

  For example, Patent Document 1 discloses a seal packing for a fuel tank cap in which a rubber layer is formed on the outer periphery of an elastic body formed of a metal or a synthetic resin in an annular shape having a crescent-shaped hollow body. A structure is described in which a plug is watertightly screwed onto a filler neck of a fuel tank via a packing. And according to such a structure, even if the elasticity reduces by the aging phenomenon of a rubber layer, the elasticity as the whole seal packing is maintained by the annular elastic body, and it is supposed that the leakage of fuel can be prevented.

  In Patent Document 2, the outer end portion including the bottom surface of the rubber ring corner portion is replaced with a substantially U-shaped reinforcing member in a joint including a receiving port, an insertion port, a rubber ring, a push ring, and a T-head bolt. The cast-iron pipe joint part for hot water piping made into the structure is described. Further, it is described that the reinforcing material is composed of one or a combination of two or more selected from high strength rubber material, fiber reinforced rubber material, high strength resin, fiber reinforced resin, fiber, metal, and wire mesh. ing. According to the invention described in Patent Document 2, even if the rubber ring is heated due to the hot water in the pipe and the rubber ring is thermally expanded, it is restrained by the reinforcing material and does not bulge locally, and there is a risk of tearing or cracking. It is said that there is no.

  Patent Document 3 discloses a combustion gas seal for a fuel injection valve that seals an annular gap between an attachment hole provided in a housing and a fuel injection valve attached to the attachment hole, and includes an outer peripheral surface of the fuel injection valve. A seal ring that is mounted in an annular groove provided in the housing, a seal washer that is sandwiched between the housing and the fuel injection valve on the rear end side of the fuel injection valve with respect to the seal ring, and a front end of the fuel injection valve with respect to the annular groove. A combustion gas seal for a fuel injection valve characterized by comprising a heat-resistant ring mounted in the second annular groove formed, and a seal washer includes a metal ring and rubber fixed by baking to the metal ring With respect to the heat-resistant ring, it is not necessary to provide a crushing allowance, and the material of the heat-resistant ring is heat-resistant in consideration of the temperature and components of the combustion gas. - the use of a chemical material having high it is preferable is described. And according to invention of patent document 3, it is supposed that favorable sealing performance can be exhibited over a long term with a simple structure.

  Patent Document 4 discloses a seal washer that is sandwiched between two annular planes of two members and seals an annular gap between the two members as a secondary seal used in a seal structure between an injector body and a cylinder head. A washer washer having two contact portions that respectively contact the annular planes of the two members, and a bent portion having elasticity that connects the two contact portions, and is attached to the sealing object side of the washer washer, A seal washer is described that includes two lip portions that respectively contact two annular planes of the two members. And such a seal washer is said to be able to exhibit a good sealing performance over a long period of time. In addition, although the primary seal | sticker is described in patent document 4, the structure is not described.

Japanese Utility Model Publication No. 62-185255 Japanese Utility Model Publication No. 6-40567 JP 2005-155394 A JP 2004-36775 A

  However, for example, in the connection structure using the seal member described in Patent Documents 1 to 4, it is not normally assumed that the connection member is removed except when the member such as the seal member is exchanged after the connection. In addition, the connection and separation are repeatedly performed at a high frequency, and in applications where a pressure of, for example, about 4 MPa is applied at the time of connection, a configuration of a substantially single seal member as described in Patent Documents 1 to 4 is adopted. There is a problem that there is a high risk of fluid leaking soon after the connection and disconnection are repeated or from the beginning. Therefore, an object of the present invention is to provide a socket capable of preventing leakage of fluid more than before even when connection and disconnection are repeated frequently or when a pressure of, for example, 4 MPa or more is applied at the time of connection. It is to provide a plug and a connection structure thereof.

  The inventor of the present invention has made extensive studies in view of the above-mentioned problems. As a result, an annular body made of a material having a compressive strength at 5% deformation of 4 MPa or more and the annular structure is formed on the housing portion of the socket connectable to the plug. A plurality of washers having an annular elastic body formed over the entire circumference of at least the vicinity of the inner circumference side of the body are provided along the major axis direction of the housing part on the inner circumference part of the housing part, and at least one of them The present inventors have found that the above-mentioned problems can be solved by making the annular elastic body of the washer slidably contact with the entire circumference of the side surface portion of the plug, thereby completing the present invention. The gist of the present invention is as follows.

(1) A socket that can be connected to a plug including a cylindrical fitting portion having a side surface portion,
A housing part that removably receives the fitting part along the longitudinal direction of the fitting part;
An annular body made of a material having a compressive strength at 5% deformation of 4 MPa or more provided in the inner circumferential part of the housing part along the major axis direction of the housing part, and a vicinity part on at least the inner circumferential side of the annular body A washer having an annular elastic body formed over the entire circumference of
In at least one of the plurality of washers, the annular elastic body forms an annular slidable contact portion that slidably contacts the entire circumference of the side surface portion of the plug.
(2) The plug has an annular receiving surface portion facing a distal end side formed at at least one selected from a base end portion, an intermediate portion and a distal end portion of the side surface portion,
The socket according to (1), wherein at least one of the plurality of washers provided has a contact surface that can contact a receiving surface portion of the plug corresponding to the elastic body.
(3) The socket according to (1) or (2), wherein at least some adjacent ones of the plurality of washers provided are in contact with each other.
(4) The thickness of the housing portion in the long axis direction of the elastic body of at least one of the plurality of washers provided is the above (1) to (3) where the inner peripheral side of the washer is thicker than the outer peripheral side. The socket according to any one of the above.
(5) The most proximal washer among the plurality of washers has a contact surface capable of contacting a receiving surface portion formed on a proximal end portion of the side surface portion of the plug in the elastic body. The socket as described in any one of-(4).
(6) By having a plurality of side surface portions having different sizes in the cross-sectional direction orthogonal to the major axis direction, it can be connected to a plug having a plurality of receiving surface portions formed at least in the intermediate portion and the base end portion,
Of the plurality of washers, two or more and less than or equal to the number of washers each have an abutment surface that can abut against a receiving surface portion of the plug corresponding to each washer in each elastic body. The socket as described in any one.
(7) A valve body that can be freely opened and closed is provided on the distal end side of the most distal side washer among the plurality of washers provided,
The socket according to any one of (1) to (6), wherein the valve body is urged so as to be in close contact with the most distal washer as a valve seat.
(8) The socket according to any one of (1) to (7), wherein a size of a lumen portion of the most distal washer is smaller than other washers.
(9) The socket according to any one of (1) to (8), wherein a filter is installed closer to a distal end side than a most distal washer among the plurality of washers.
(10) The socket according to (9), wherein a filter is installed on the tip side of the valve body.
(11) The socket according to any one of (1) to (10), wherein the material constituting the annular body of the washer and the material constituting the elastic body of the washer include the same kind of polymer component.

(12) A plug-and-socket connection structure for connecting the plug and the socket with a good seal and detachable,
The plug has a cylindrical fitting part having a side part,
A plurality of the sockets are provided along the major axis direction of the housing part, and a housing part that detachably receives the cylindrical fitting part along the major axis direction of the plug, and an inner peripheral part of the housing part. A washer having an annular body made of a material having a compressive strength of 5 MPa or more at 5% deformation and an annular elastic body formed over the entire circumference of at least the vicinity of the inner circumference of the annular body,
In at least one of the plurality of washers provided, the fitting portion of the plug is connected to the housing portion so that the annular elastic body is in sliding contact with the entire circumference in the circumferential direction of the side surface portion of the plug. The plug and the socket are fixed so as to restrict their axial movement, and the elastic body receives a compressive force between the side surface portion of the plug and the annular body of the washer. Plug and socket connection structure with washer in close contact.
(13) The plug has an annular receiving surface portion facing the distal end side formed in at least one selected from the base end portion, the intermediate portion, and the distal end portion of the side surface portion,
The plug and socket connection structure according to (12), wherein at least one of the plurality of washers provided has a contact surface in contact with a receiving surface portion of the plug corresponding to the elastic body.
(14) The plug and socket connection structure according to (12) or (13), wherein a side surface portion of the plug is tapered toward a tip end side.
(15) Among the plurality of washers provided, a valve body that can be opened and closed is installed closer to the distal end than the most distal washer,
The valve body is urged and closed so as to be in close contact with the most distal washer as a valve seat, and when the plug is connected to a socket, the receiving surface portion of the distal end portion of the side surface portion of the plug is The plug and socket connection structure according to any one of (12) to (14), wherein the plug and socket are opened by contacting the valve body.
(16) The receiving surface portion formed at the base end portion of the side surface portion of the plug is in contact with the contact surface of the most proximal washer, and the receiving surface portion formed at the tip portion of the side surface portion is the valve body. The plug and socket connection structure according to (15), wherein the size of the inner cavity of the washer as a valve seat is smaller than other washers.

(17) A plug connectable to the socket according to any one of (1) to (11),
A cylindrical fitting portion having a side surface portion in sliding contact with the sliding contact portion of the washer;
An annular receiving surface portion facing the distal end formed at least at the base end portion and the intermediate portion of the side surface portion,
The receiving surface portion is a plug having a smaller size in the cross-sectional direction perpendicular to the long axis direction on the distal end side of the side surface portion.
(18) The plug according to (17), wherein a side surface portion of the plug is tapered toward a tip end side.

  According to the present invention, even when connection and separation are repeated frequently, even when a pressure of, for example, about 4 MPa is applied at the time of connection between the socket and the plug, it is possible to prevent fluid leakage more than before.

It is sectional drawing which showed typically the one part cross section of 1st embodiment of the socket which concerns on this invention. It is sectional drawing which showed typically the one part cross section of 2nd embodiment of the socket which concerns on this invention. It is sectional drawing which showed typically the cross section of 3rd embodiment of the socket which concerns on this invention. It is sectional drawing which showed typically the cross section of 4th embodiment of the socket which concerns on this invention. It is sectional drawing which showed typically the cross section of 5th embodiment of the socket which concerns on this invention. 1 is a cutaway sectional view schematically showing a first embodiment of a plug according to the present invention. It is sectional drawing which showed typically the cross section of the vicinity part of the fitting part of 2nd embodiment of the plug which concerns on this invention. It is sectional drawing which showed typically the cross section of the vicinity part of the fitting part of 3rd embodiment of the plug which concerns on this invention. It is sectional drawing which showed typically the cross section of 1st embodiment of the connection structure which concerns on this invention. It is sectional drawing which showed typically the cross section of 2nd embodiment of the connection structure which concerns on this invention. It is sectional drawing which showed typically the cross section of 3rd embodiment of the connection structure which concerns on this invention. It is sectional drawing which showed typically the cross section of 4th embodiment of the connection structure which concerns on this invention. It is sectional drawing which showed typically the cross section of 5th embodiment of the connection structure which concerns on this invention. It is sectional drawing which showed typically the cross section of 6th embodiment of the connection structure which concerns on this invention. It is sectional drawing which showed typically the cross section of 7th embodiment of the connection structure which concerns on this invention. It is sectional drawing which showed typically the cross section of 8th embodiment of the connection structure which concerns on this invention. It is explanatory drawing for demonstrating an example of the connection state of a socket and the hub of a catheter.

  Embodiments of the present invention will be described below with reference to the drawings. For convenience, reference numerals may be omitted in the drawings. In this case, other drawings are referred to. Moreover, the dimension of the various members in drawing may be adjusted so that it may be easy to see for convenience.

<Socket>
The socket according to the present invention can be connected to a plug including a cylindrical fitting portion having a side surface portion. The socket includes a housing portion that removably receives a fitting portion of a plug along a major axis direction of the fitting portion, an annular body made of a material having a compressive strength at 5% deformation of 4 MPa or more, and the annular body. A washer having an annular elastic body formed over the entire circumference of at least the vicinity of the inner circumference side. Further, a plurality of washers are provided along the long axis direction of the housing portion on the inner peripheral portion of the housing portion. In at least one of the plurality of washers, the annular elastic body forms an annular slidable contact portion that slidably contacts the entire circumference of the side surface of the plug.
Here, “a material whose compressive strength at 5% deformation is 4 MPa or more” includes materials whose compressive strength cannot be measured because 5% deformation is substantially impossible. Further, when the material is a resin material, the compressive strength at the time of 5% deformation can be obtained according to JIS K7181.

  As described above, a plurality of washers having a specific structure are provided along the long axis direction of the housing portion, and at least one of the annular elastic bodies is in sliding contact with the entire circumference of the side surface portion of the plug. By forming the contact portion, it is possible to repeatedly attach and detach the socket and the plug, while the fitting portion of the plug is received in the housing, and when the plug and the socket are connected and fixed, at least the side surface portion of the plug and Since the annular elastic body of one washer can be in close contact with the entire circumference in the circumferential direction of the side surface portion, the sealing performance is maintained. Further, even when the plug is repeatedly attached and detached, the plurality of washers having a predetermined structure are provided along the long axis direction of the housing portion, and therefore, it is possible to make close contact with at least one of the washers. Therefore, even when the plug is repeatedly attached and detached, even when the sealing performance of a certain washer is lowered, the sealing performance can be maintained by another washer.

  FIG. 1 is a cross-sectional view schematically showing a cross section of a part of the first embodiment of the socket according to the present invention. As shown in FIG. 1, the socket 1 of the first embodiment includes a housing portion 10 and a plurality of washers 16, 17, and 18 provided on the inner peripheral portion 11. In the present embodiment, adjacent ones of the washers 16, 17, 18 are in contact with each other.

  The housing part 10 has a structure for detachably receiving a plug, which will be described later, along the long axis direction of the fitting part. In the present embodiment, an opening 12 for receiving a plug is formed on the proximal end side of the housing portion 10, and an inner peripheral portion 11, a bottom portion 19, and a flow path 14 are sequentially provided from the opening portion 12 toward the distal end side. . The tip of the channel 14 is open and communicates from the opening 12 to the tip of the channel 14. In the present embodiment, a filter 15 is provided in the vicinity of the bottom 19 of the flow path 14.

  The major axis direction A of the housing part 10 coincides with the major axis direction of the fitting part of the plug when received in the housing part 10. The inner peripheral portion 11 is provided with a recess 13 for fixing the annular washers 16, 17, 18 along the long axis direction A over the entire circumference along the circumferential direction of the inner wall surface. . In the present embodiment, the washers 16, 17, 18 adjacent to each other along the major axis direction A are connected to each other, so that the structure of the recess 13 is the same as that of the washers 16, 17, 18 in the major axis direction A. The length in the major axis direction A equivalent to the sum of the thicknesses (sides close to the inner peripheral portion 11) or a length slightly smaller than that is preferable. That is, it is preferable to set the length in the long axis direction A so that the washer 16, 17, 18 does not play in the long axis direction A. In this case, a structure in which the length in the major axis direction A can be adjusted may be employed. With the configuration of the concave portion 13 as described above, the sealing performance can be improved. Further, the width of the recess 13 in the direction orthogonal to the major axis direction A may be a size corresponding to the annular structure of the washers 16, 17, 18. The structure of the inner peripheral part 11 and the recessed part 13 may be determined according to the structures of the washers 16, 17 and 18. However, from the viewpoint of improving the sealing performance by the washers, the cross section in the direction orthogonal to the major axis direction A is used. A circular shape is preferred.

  The structure of the housing part 10 other than that described above is not particularly limited. A more specific example will be described later (for example, see FIGS. 3A and 3B).

  The washers 16, 17 and 18 are all annular portions 16a, 17a and 18a made of a material having a compressive strength at 5% deformation of 4 MPa or more, and the vicinity of at least the inner peripheral side of the annular members 16a, 17a and 18a. The ring-shaped elastic bodies 16b, 17b, and 18b are formed over the entire circumference. In this embodiment, the washers 16, 17, and 18 are formed with annular elastic bodies on the distal end side and the proximal end side of the socket 1 in addition to the inner peripheral sides of the annular bodies 16a, 17a, and 18a. In the present embodiment, the elastic bodies on the inner peripheral side, the distal end side, and the proximal end side are integrally formed. An annular elastic body may be formed on the outer peripheral side of the annular bodies 16a, 17a, 18a. That is, the entire annular bodies 16a, 17a, and 18a may be covered with an elastic body. By forming an annular elastic body over the entire circumference of at least the inner peripheral side of the annular body, high sealing performance when connected to the plug is easily realized while sliding in and out of the plug. Is done. Further, by providing an elastic body on at least one of the distal end side and the proximal end side, it is possible to further improve the sealing performance particularly when adjacent washers are in contact with each other. Furthermore, by providing an elastic body also on the outer peripheral side, adhesion with the wall surface forming the recess 13 can be obtained, and the sealing performance can be further improved.

  The annular bodies 16a, 17a, and 18a are preferably made of a material having a compressive strength of 4 MPa or more when deformed at 5%, more preferably 10 MPa or more, further preferably 100 MPa or more, and particularly preferably 200 MPa or more. By having such compressive strength, for example, even when a pressure of 4 MPa is applied at the time of connection with the plug, the sealing performance can be maintained. Examples of the material constituting such an annular body include aromatic polyether ketone such as polyether ether ketone, polyimide resin, polyamide resin, acrylic resin, fluororesin, polyolefin resin, polyurethane resin, phenol resin, and epoxy resin. And synthetic resins such as stainless steel and metals such as iron. Of these, metals are more preferred. In addition, in the synthetic resin, when the compressive strength at the time of 5% deformation is 200 MPa or more, it is considered that the synthetic resin has strength equal to or higher than that of a metal such as stainless steel.

  The elastic bodies 16b, 17b, and 18b can be configured using an elastic material such as natural rubber, synthetic rubber, and thermoplastic elastomer. Examples of such elastic materials include isoprene rubber, butadiene rubber, styrene / butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene, ethylene propylene rubber, chlorosulfonated polyethylene, acrylic rubber, fluorine rubber, silicone rubber, and urethane rubber. , Polyamide elastomer, urethane elastomer, and the like. Moreover, from a viewpoint of ensuring sealing property suitably, Shore A hardness is preferable 50-90, and 60-80 are more preferable. For example, when using for the purpose of inserting a fluid into a medical device or the like, it is preferable to use a material that does not use oil in order to prevent foreign matter from entering. From such a viewpoint, fluorine rubber, silicone rubber, nitrile rubber and the like are preferable.

  The combination of the constituent material of the annular body and the constituent material of the elastic body in the washer used in the present invention can be appropriately selected within the range where the effects of the present invention are exhibited. For example, a combination in which the material constituting the annular body is a metal and a material constituting the elastic body is a synthetic resin, and a combination in which both the annular body and the elastic body are synthetic resins can be exemplified. Among these, in the case of a combination in which both the annular body and the elastic body are synthetic resins, both can be a combination including the same kind of polymer component. Examples of such combinations include a combination of an acrylic resin for the annular body, a combination of acrylic rubber for the elastic body, a polyamide resin for the annular body, and a polyamide elastomer for the elastic body. From the viewpoint of chemical resistance, it is preferable that both contain the same polymer component having chemical resistance. As such a combination, for example, a fluorine resin such as polytetrafluoroethylene (PTFE) may be used for the annular body, and a fluorine rubber may be used for the elastic body.

  The washer that can be used in the present invention is a method in which an annular body and an elastic body are separately formed and then integrated using an adhesive, etc., and the annular body and the elastic body are integrated in a mold by transfer molding or the like. Or the like. Moreover, a commercial item can be used. For example, what is sold as a seal washer from NOK Corporation can be used.

  The elastic bodies 16b, 17b, 18b of the washers 16, 17, 18 have a lumen portion surrounded by the inner peripheral surfaces 16c, 17c, 18c. The inner peripheral surfaces 16c, 17c, and 18c form the inner peripheral surfaces of the washers 16, 17, and 18, and are formed over the entire circumference of the inner peripheral portions of the annular washers 16, 17, and 18. Then, at least one inner peripheral surface of the washers 16, 17, 18 forms an annular sliding contact portion that is in sliding contact with the entire circumference in the circumferential direction of the side surface portion of the plug. Accordingly, it is sufficient that at least one of the inner cavity portions of the washers 16, 17, and 18 has a structure capable of sliding contact with the side surface portion of the fitting portion of the plug.

  In the present invention, two or more and a total number of washers among a plurality of washers may have contact surfaces that can contact the receiving surface portions of the plugs corresponding to the respective washers in each elastic body.

  In the present embodiment, of the plurality of washers, the most proximal washer 16 and the most distal washer 18 have contact surfaces 16d and 18d that can contact a receiving surface portion of a plug, which will be described later. That is, the contact surfaces 16d and 18d can be contact surfaces from the beginning of use when the plug has a corresponding receiving surface portion. Further, even when the plug that is not in contact with the receiving surface portion of the plug comes into contact with each other repeatedly during the attachment and detachment with the plug, the contact surface can be obtained. The contact surfaces 16d and 18d are formed on the washer 16 and 18 on the surface facing the base end side. In the present embodiment, it is preferable that at least one of the contact surfaces 16d and 18d is in contact with the corresponding receiving surface portion of the plug from the beginning or during repeated attachment and detachment.

  Among these, it is preferable that the most proximal washer 16 forms the contact surface 16d in the elastic body 16b. Thereby, the pressing force from the base end side can be effectively transmitted to the washers 16, 17, and 18, and the sealing performance can be further improved. This is especially true when the adjacent washers are all in contact as in this embodiment. In addition, as will be described later, when the portion that can be the contact surface 18d of the washer 18 on the distal end side does not contact the receiving surface portion of the plug, the washers 16, 17 are provided in the gap between the receiving surface portion and the contact surface 18d. It is possible to effectively capture the cutting pieces of the elastic bodies 16b and 17b generated by the sliding contact between the plug and the plug. On the other hand, when the portion that can be the contact surface 18d of the washer 18 is in contact with the receiving surface portion of the plug, it is difficult to expect a supplementary effect of the cutting piece, but the sealing performance is improved by forming a plurality of contact surfaces. I can expect.

  As described above, the most distal washer 18 has the abutting surface 18 d so that the lumen surrounded by the inner peripheral surface 18 c is smaller than the lumens of the other washers 16 and 17. In the present embodiment, the sizes of the lumens of the washers 16 and 17 are substantially the same, and the washer 18 is smaller than the washers 16 and 17. However, the present invention is not limited to this, and the washers 16, 17 and 18 are arranged in this order. You may make it small as it goes to a front end side from a base end side. The same applies when the number of washers is four or more. In this way, by sequentially reducing the inner cavity portion toward the distal end side, it is possible to improve the sealing performance and to effectively capture the elastic cutting piece by repeatedly attaching and detaching the plug.

  In the present invention, a surface that may come into contact is referred to as a contact surface for convenience.

  In the present embodiment, the most proximal washer 16 has a thickness in the major axis direction A of the elastic body 16b that is greater on the inner peripheral side of the washer 16 than on the outer peripheral side. The method of changing the thickness is not particularly limited, but a configuration that can be easily deformed when connected to a plug or installed in a housing portion and that can easily increase the degree of deformation is preferable. In the present embodiment, a convex portion 16 e directed to the side facing the proximal end side is formed along the inner peripheral surface 16 in the vicinity of the inner peripheral surface 16 side of the elastic body 16 b of the washer 16. By forming such a convex portion 16e, when the convex portion 16e is crushed by the receiving surface portion of the plug, the convex portion 16e protrudes toward the inner cavity portion side of the washer 16, and the sealing performance can be further improved. Moreover, you may form the convex part which goes to the side which faces the front end side in the inner peripheral side vicinity part of the washer 16. As shown in FIG. In this case, the side facing the distal end side of the washer 16 is in contact with the side facing the proximal end side of the washer 17, so that the convex portion toward the side facing the distal end side of the washer 16 is crushed in the same manner. Sealability can be further improved. The same can be said for the washer 17, and the same function can be achieved for the washer 18 by forming a convex portion on the side facing the base end. That is, a convex portion may be provided in the vicinity of the inner peripheral side on the side facing at least one of the proximal end side and the distal end side of the washer 17 and the proximal end side of the washer 18. As for the washer 18, as will be described later, when a valve body is provided on the front end side of the washer 18, the side facing the front end side of the washer 18 from the viewpoint of further improving the sealing performance of the washer 18 as a valve seat. A convex portion corresponding to the structure of the valve body may be provided.

  In the present embodiment, adjacent ones of the washers 16, 17, and 18 are in contact with each other. However, as will be described later, adjacent ones may not be in contact with each other, or at least some of the adjacent ones are adjacent to each other. (Washer 16 and washer 17, or washer 17 and washer 18) may be in contact with each other. Thus, among the plurality of washers, there is a set of those in which adjacent ones are in contact with each other, so that the sealing performance can be improved as compared with the case where there is no one in contact.

  The filter 15 can be optionally provided to prevent the cutting pieces, dust, and the like of the elastic bodies 16b, 17b, and 18b described above from being released from the distal end side of the socket 1 as necessary. As such a filter 15, the size of the mesh and the like may be appropriately determined according to the application. A commercially available filter can be used for such a filter. It is preferable that the filter 15 is installed on the distal end side than the most distal washer 18 from the above viewpoint. Moreover, when providing a valve body so that it may mention later, it is preferable that the filter is installed in the front end side rather than the valve body.

  FIG. 2 is a cross-sectional view schematically showing a cross section of a part of the second embodiment of the socket according to the present invention. In the first embodiment, the socket 2 according to the second embodiment uses a washer 22 that does not have an abutment surface 18d like the washer 18 in place of the most distal washer 18 in the first embodiment. In the present embodiment, the sizes of the lumens of the washers 16, 17, and 22 are substantially the same. The structure of the washer 22 is formed over the entire circumference of the annular body 22a made of a material having a compressive strength at 5% deformation of 4 MPa or more and at least the vicinity of the inner circumferential side of the annular body 22a, similar to the washers 16 and 17. And an annular elastic body 22b. In the example shown in FIG. 2, the elastic body 22b is not formed on the outer peripheral surface side of the annular body 22a, but may be formed. A valve body 20 that can be freely opened and closed is provided on the tip side of the washer 22, and the valve body 20 is biased by a spring 21 so as to be in close contact with a washer 22 as a valve seat, and is closed. . Further, when the plug is connected, the valve body 20 is pushed and opened toward the tip side. That is, the socket 2 also functions as a check valve. In the second embodiment shown in FIG. 2, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different components are described below.

  The structure of the valve body 20 is not particularly limited as long as the valve body 20 can be in close contact with the surface facing the distal end side of the washer 18 in the closed state. In the example shown in FIG. 2, it has a flat plate-like structure, and can be in close contact with a part of the washer 22 that faces the front end side in the vicinity of the inner peripheral surface 22 c at the entire circumference. In the present embodiment, the valve body 20 has a disk-like structure, but is not limited thereto, and may have a spherical structure. Also, other general check valve structures can be employed. The valve body 20 is urged by a spring 21 installed between a surface facing the distal end side of the most distal washer 22 and the bottom portion 19. The structure of the spring 21 is not particularly limited, and a general spiral structure or the like can be adopted. Further, from the viewpoint of further improving the sealing performance of the washer 22 as a valve seat, a convex portion corresponding to the structure of the valve body 20 may be provided on the side facing the distal end side of the annular body 22a. For example, you may form the convex part which goes to the inner peripheral side vicinity part of the washer 22 toward the side which faces a front end side.

  3A and 3B show the entire structure of the housing part 10 shown in FIGS. 1 and 2 more specifically. FIG. 3A is a cross-sectional view schematically showing a cross-section of the third embodiment of the socket according to the present invention. FIG. 3B is a cross-sectional view schematically showing a cross-section of the fourth embodiment of the socket according to the present invention. In FIGS. 3A and 3B, the same reference numerals are given to the configurations common to the first embodiment and the second embodiment, the description thereof is omitted, and different configurations will be described below.

  FIG. 3A shows that the housing portion 10 in the first embodiment is configured to be detachable and detachable into the proximal end side housing portion 10a and the distal end side housing portion 10b, and the valve body in the second embodiment is adopted and reversed. It is configured to have a function as a stop valve.

  As for the socket 3a which concerns on 3rd embodiment shown to FIG. 3A, a housing part is comprised by the base end side housing part 10a and the front end side housing part 10b. In the present embodiment, the distal end side of the proximal end side housing portion 10a has a female screw fitting portion 31, and the proximal end side of the distal end side housing portion 10b has a male screw fitting portion 30, The male screw fitting part 30 is screwed together, and the proximal end side housing part 10a and the distal end side housing part 10b are detachably connected. Further, by screwing in this way and adjusting the length of the screwing, the washers 16, 17 and 18 are sandwiched between the proximal housing part 10a and the distal housing part 10b, and adjacent washers are connected to each other. And the length in the major axis direction A can be adjusted. In the present embodiment, the length of the screwing is performed between the end surface portion on the proximal end side of the recess 13 of the proximal end side housing portion 10a and the end surface portion of the distal end portion of the male screw fitting portion 30 on the distal end side housing portion 10b. By adjusting the height, it is possible to adjust the degree of compression of the washers 16, 17, 18 in the long axis direction A. In the example shown in FIG. 3A, the end surface portion of the distal end portion of the male screw fitting portion 30 of the distal end side housing portion 10b is continuous with the end portion on the distal end side of the concave portion 13 of the proximal end side housing portion 10a. The length in the long axis direction A when the adjacent washers are brought into close contact with each other is regulated by coming into contact with the stepped portion 31a provided at the proximal end of the fitting portion 31. . Although not shown, the recess 13 of the base end side housing part 10a and the female screw fitting part 31 have the same size in the direction orthogonal to the major axis direction A so that the female screw fitting part 31 is also provided in the concave part 13. The number of washers can be easily adjusted, and the degree of close contact between washers can be adjusted more flexibly.

  The distal end side of the distal end side housing portion 10b of the socket 3a has a female threaded portion 32 and a male tapered portion 33 so that the socket 3a can be detachably fixed to other connectors, and the proximal end of the proximal end side housing portion 10a. The opening 12 on the side communicates with the distal end opening 35a of the flow path 34a of the distal housing part 10b. The male taper part 33 has a taper structure which tapers as an outer peripheral part goes to the front end side.

  The socket 3b according to the fourth embodiment shown in FIG. 3B includes a proximal end side housing portion 10a and a distal end side housing portion 10c. The distal housing part 10c is provided with a male thread part 36 instead of the female thread part 32 and the male taper part 33 in the distal housing part 10b of the third embodiment. Further, the proximal end side opening portion 12 of the proximal end side housing portion 10a communicates with the distal end side opening portion 35b of the flow path 34b of the distal end side housing portion 10c.

  The socket 4 according to the fifth embodiment shown in FIG. 4 includes a proximal end side housing portion 10d and a distal end side housing portion 10c. In the present embodiment, unlike the first to fourth embodiments, the plurality of washers 16, 17, and 18 have a configuration in which adjacent washers 16, 17, and 18 are not in contact with each other. As shown in FIG. 4, the proximal-side housing portion 10 d includes annular members 40, in the recesses 43 provided in the inner peripheral portion 11, between the washers 16 and 17, and between the washers 17 and 18, respectively. 41 is provided. The annular members 40 and 41 preferably have a function similar to that of the annular body constituting the washer. That is, it is preferable that the material is composed of a material having a compressive strength at 4% deformation of 4 MPa or more. In this embodiment, although the annular members 40 and 41 were used, it is not restricted to this, You may provide the inner peripheral part 11 with the recessed part corresponding to each washer 16, 17, and 18. FIG. In this case, the distance between the washers is preferably not more than twice the thickness of the washer from the viewpoint of sealing performance and miniaturization of the socket. Even if the washers 16, 17, and 18 are arranged apart from each other as in the fifth embodiment, the effect of the present invention is achieved, but the sealing performance is improved when adjacent washers are in contact with each other. There is expected. Further, from the viewpoint of reducing the size of the socket, it is more advantageous when adjacent washers are in contact with each other.

<Plug>
The plug according to the present invention can be connected to the aforementioned socket. In addition, the plug faces a distal end side formed in a cylindrical fitting portion having a side surface portion in sliding contact with the sliding contact portion of the above-described socket washer, and at least a base end portion and an intermediate portion of the side surface portion. And an annular receiving surface portion. The receiving surface portion preferably has a smaller size in the cross-sectional direction perpendicular to the major axis direction on the tip side of the side surface portion. In the present invention, the receiving surface portion is formed so as to be in contact with the contact surface of the socket. That is, even when it does not contact the contact surface, it is referred to as a receiving surface portion for convenience. That is, it may not contact the contact surface of the socket at the beginning of use, but may contact the contact surface by repeated use. Moreover, there may be no case of contact at all. Whether or not to contact depends on the relationship with the structure of the socket.

  FIG. 5 is a cut-away sectional view schematically showing the first embodiment of the plug according to the present invention. As shown in FIG. 5, the plug 5 according to the first embodiment has a main body 50 and is connected to a tube 58 by a tube joint 57 on the proximal end side of the main body 50. The main body 50 has a cylindrical structure having a lumen 56 that communicates with the tube 58, and the distal end of the lumen 56 opens to form the distal opening 54 of the main body 50. A cylindrical fitting portion 51 that is received in the housing portion of the socket is formed at the distal end portion of the main body portion 50. The fitting part 51 has a side part 52. In the present embodiment, the side surface portion 52 has a receiving surface portion 53a at the proximal end portion, a receiving surface portion 53c at the distal end portion, and a receiving surface portion 53b at the intermediate portion. The receiving surface portion 53 c corresponds to the tip of the main body portion 50. The inner cavity portion of the annular receiving surface portion 53 c becomes the tip opening portion 54. In the present invention, the base end portion of the side surface portion is the end portion on the base end side of the side surface portion, the front end portion of the side surface portion is the end portion on the front end side of the side surface portion, and the intermediate portion of the side surface portion is the end portion of the side surface portion. It means the part between the proximal end and the distal end.

  Each of the receiving surface portions 53a to 53c has a smaller size in the cross-sectional direction orthogonal to the major axis direction B as each position is directed toward the distal end side of the side surface portion 52. Each of the receiving surface portions 53a to 53c has an annular structure. The annular structure is not particularly limited, but an annular shape is preferable from the viewpoint of obtaining hermeticity. In addition, although the notch part 55 is formed in the receiving surface part 53c, it shall be contained in an annular | circular shape. The number of receiving surface portions is three in this embodiment, but may be four or more, or may be two or one as in the second or third embodiment. It can be determined as appropriate according to the number and structure of socket washers. Moreover, the structure of the side part 52 can be determined according to the number of installation of a receiving surface part.

  The side surface portion 52 includes a proximal side surface portion 52a, an intermediate side surface portion 52b, and a distal end side surface portion 52c. The sizes in the cross-sectional direction orthogonal to the major axis direction B are different from each other. The portion 52a, the intermediate side surface portion 52b, and the tip side surface portion 52c become smaller in this order. That is, in the present embodiment, the side surface portion 52 (fitting portion 51) is configured so that the size of the cross section decreases stepwise from the proximal end side toward the distal end side, and the size increases stepwise. Receiving surface portions 53a to 53c are formed in each step portion corresponding to the changing portion. In the present embodiment, the proximal side surface portion 52a, the intermediate side surface portion 52b, and the distal end side surface portion 52c have the same size in the cross-sectional direction perpendicular to the major axis direction B along the major axis direction B. In this way, it may be configured in a straight tube shape, or may be configured in a tapered shape so as to taper toward the tip side. Each of the proximal side surface portion 52a, the intermediate side surface portion 52b, and the distal end side surface portion 52c may be independently a straight tube shape or a tapered shape. In the case of a taper shape that tapers toward the tip side, there is an advantage that the resistance at the time of attaching to and detaching from the socket is reduced.

  The front end side surface portion 52 c is provided with a notch portion 55 that communicates with the lumen portion 56. When the valve body is provided in the socket, the valve body is pressed by the receiving surface portion 53c. Therefore, the fluid from the tube 58 is transferred to the flow path of the socket (for example, reference numeral 14 in FIG. 1) only at the distal end opening 54. Since it cannot pass, it is preferable to provide the notch part 55. But you may provide not the notch part but the through-hole in the front end side part 52c.

  On the base end side of the main body 50, a connecting portion 59 that is detachably connected to the tube joint 57 is provided. The connecting portion 59 has a male taper screw structure in the present embodiment, but is not limited thereto. A general joint can be used as the tube joint 57. The material of the tube 58 may be appropriately selected depending on the application, but for example, in the application where a high pressure of 4 MPa or more is applied, a material having high pressure resistance may be used.

  FIG. 6 is a cross-sectional view schematically showing a cross section of the fitting portion of the second embodiment of the plug according to the present invention. The plug 6 according to the second embodiment generally has a structure in which two receiving surface portions are provided instead of the structure in which three receiving surface portions are provided like the fitting portion 51 of the plug 5 according to the first embodiment. The fitting part 61 which has is provided. Briefly, the plug 6 has a main body 60, and is connected to the tube by a tube joint on the base end side of the main body 60 as in the first embodiment. The main body 60 has a cylindrical structure having a lumen 66 that communicates with the tube, and the distal end of the lumen 66 opens to form a distal opening 64 of the main body 60. A cylindrical fitting portion 61 that is received in the housing portion of the socket described above is formed at the distal end portion of the main body portion 60. The fitting part 61 has a side part 62. In the present embodiment, the side surface portion 62 has a receiving surface portion 63a at the proximal end portion and a receiving surface portion 63c at the distal end portion. The receiving surface portion 63 c corresponds to the tip of the main body portion 60. The inner cavity portion of the annular receiving surface portion 63 c becomes the tip opening portion 64.

  Each of the receiving surface portions 63a and 63c has a smaller size in the cross-sectional direction orthogonal to the major axis direction B as the position thereof moves toward the distal end side of the side surface portion 62. Moreover, the receiving surface parts 63a and 63c each have an annular structure. The annular structure is not particularly limited, but an annular shape is preferable from the viewpoint of obtaining hermeticity. The receiving surface portion 63c is formed with a notch 65, but is assumed to be included in an annular shape.

  The side surface portion 62 includes a proximal side surface portion 62a and a distal end side surface portion 62b, and the sizes in the cross-sectional direction orthogonal to the major axis direction B are different from each other. The side portions 62b become smaller in order. That is, also in the present embodiment, the side surface portion 62 (the fitting portion 61) is configured so that the size of the cross section decreases stepwise from the proximal end side to the distal end side, and the size increases stepwise. Receiving surface portions 63a and 63c are formed at each step corresponding to the changing portion. In the present embodiment, the base end side surface portion 62a and the distal end side surface portion 62b are straight pipe shapes so that the sizes in the cross-sectional direction orthogonal to the long axis direction B are the same along the long axis direction B. You may comprise, and you may comprise in a taper shape so that it may taper toward the front end side. Each of the proximal end side surface portion 62a and the distal end side surface portion 62b may be independently a straight pipe shape or a tapered shape. A cutout portion 65 communicating with the lumen portion 66 is provided in the distal side surface portion 62b.

FIG. 7 is a cross-sectional view schematically showing a cross section of the fitting portion of the third embodiment of the plug according to the present invention. The plug 7 according to the third embodiment is generally provided with a fitting portion 71 having a structure in which one receiving surface portion is provided instead of the fitting portion 51 of the plug 5 according to the first embodiment. .
Briefly, the plug 7 has a main body portion 70 and is connected to a tube by a tube joint on the base end side of the main body portion 70 as in the first embodiment. The main body portion 70 has a cylindrical structure having a lumen portion 76 that communicates with the tube, and the distal end portion of the lumen portion 76 opens to form a distal end opening portion 74 of the main body portion 70. A cylindrical fitting portion 71 that is received in the housing portion of the socket is formed at the distal end portion of the main body portion 70. The fitting part 71 has one side part 72. In the present embodiment, the side surface portion 72 has one receiving surface portion 73c only at the tip portion. The receiving surface portion 73 c corresponds to the tip of the main body portion 70. A lumen portion of the annular receiving surface portion 73 c becomes a tip opening portion 74. The receiving surface portion 73c has an annular structure. The annular structure is not particularly limited, but an annular shape is preferable from the viewpoint of obtaining hermeticity. Although the notch part 75 is formed in the receiving surface part 73c, it shall be contained in an annular | circular shape. In the present embodiment, the side surface portions 72 may each be configured in a straight tube shape so that the size in the cross-sectional direction orthogonal to the major axis direction B is the same along the major axis direction B. You may comprise in a taper shape so that it may taper toward the side.

<Connecting structure of plug and socket>
The plug and socket connection structure according to the present invention is a connection structure for detachably connecting the plug and socket with good sealing performance. The plug has a cylindrical fitting portion having a side surface portion. The socket is provided with a housing portion that detachably receives the cylindrical fitting portion along the long axis direction of the plug, and a plurality of sockets are provided on the inner peripheral portion of the housing portion along the long axis direction of the housing portion. And a washer having an annular elastic body formed over the entire circumference in the vicinity of at least the inner peripheral side of the annular body. In at least one of the plurality of washers, the fitting portion of the plug is received by the housing portion so that the annular elastic body is slidably contacted over the entire circumference of the side surface portion of the plug. Then, the plug and the socket are fixed so as to restrict their axial movement, and the elastic body receives a compressive force between the side surface portion of the plug and the annular body of the washer, so that the plug and the washer are In close contact.

  As described above, since at least one elastic body of the plurality of washers having a predetermined structure is configured to slidably contact the entire circumference of the side surface portion of the plug, the fitting portion of the plug Is received by the housing part, and when the plug and the socket are fixed so as to restrict their axial movement, the elastic body receives a compressive force between the side surface part of the plug and the annular body, and the elastic body The side surface portion is in close contact, that is, the plug and the washer are in close contact with each other, and the sealing performance is ensured. In addition, even when the plug and socket are repeatedly attached and detached, since a plurality of washers are provided, the intimate contact portion can be changed sequentially, so that the sealing performance can be maintained for a long time.

  In the connection structure according to the present invention, the plug and the socket are fixed so as to restrict their axial movement. Thereby, the connection state of the plug and the socket is maintained. In order to maintain the connection state between the socket and the plug, it is preferable to fix the connection state by fixing the socket and the plug to each other when pressure is applied, or by pressing one side fixed to the other side. As a mechanism for fixing to each other, for example, on the inner peripheral part of the housing part of the socket, a projection part that can project to the inner peripheral surface is provided, and a concave part that receives the projection part is provided on the fitting part of the plug. A mechanism for detachably fixing the plug and the socket by engaging the portion and the concave portion is exemplified. Various latch mechanisms can be used. Alternatively, a mechanism may be employed in which the outer peripheral surface of the housing portion of the socket is fixed by an arbitrary method, and the plug is pressed against the socket by an air cylinder from the plug side.

  FIG. 8 is a cross-sectional view schematically showing a cross section of the first embodiment of the connection structure according to the present invention. The present embodiment shows an embodiment of the connection structure 101 of the case where the socket 1 according to the first embodiment is used as a socket and the plug 7 according to the third embodiment is used as a plug. FIG. 8 shows a state in which the plug 7 and the socket 1 are fixed so as to restrict their movement in the axial direction (B, A).

  The fitting portion 71 of the plug 7 is received in the housing portion 10 of the socket 1 along the long axis direction B thereof. The long axis direction B of the plug 7 coincides with the long axis direction A of the housing part 10 of the socket 1. Of at least one of the washer 16 and the washer 17 among the washers 16, 17 and 18 provided in the recess 13 of the inner peripheral part 11 of the housing part 10, the inner peripheral surfaces 16 c and 17 c of the elastic bodies 16 b and 17 b. Of the side surface 72 of the plug 7 is in contact with the entire circumference in the circumferential direction of the plug 7, and at least one of the elastic bodies 16 b and 17 b is at least one of the side surface 72 of the plug 7, the washer 16, and the washer 17. Upon receiving a compressive force between one of the annular bodies 16a and 17a, at least one of the elastic body 16b and the elastic body 17b and the side surface portion 72 of the plug 7 are in close contact with each other.

  In the present embodiment, it is preferable that the side surface portion 72 of the plug 7 has a tapered shape so as to taper toward the distal end side from the viewpoint of facilitating attachment / detachment while ensuring the sealing performance of the plug 7 and the socket 1. In this case, (i) the inner peripheral surfaces 16c and 17c of the elastic bodies 16b and 17b of the washers 16 and 17 of the socket 1 may have a shape corresponding to the tapered shape of the side surface portion 72, or (ii) each inner peripheral surface. The size of the inner circumferential surface 17c may be smaller than the inner circumferential surface 16c while the size of the direction 16c, 17c perpendicular to the major axis direction A is made constant along the axial direction. (Iii) If the size of each inner peripheral surface 16c, 17c in the direction perpendicular to the major axis direction A is constant along the axial direction, the inner peripheral surface 16c and the inner peripheral surface 17c are made the same size. Good. Among these, in the case of (ii) and (iii), even if the washer 16 on the proximal end side is relatively tightly adhered, and the sealing performance of the washer 16 is lowered after repeated use, the plug 7 is attached to the socket 1. By increasing the insertion width, the adhesiveness is secured by the washer 17 on the tip side from the washer 16, and the sealing performance as the whole connection structure tends to be easily maintained. FIG. 8 shows the state at this time, and not only the elastic body 16 b but also the base end side of the elastic body 17 b is in close contact with the side surface portion 72. Therefore, at the beginning of use, it can be assumed that only the washer 16 and only the side surface portion 72 of the plug 7 are in close contact.

  In the example shown in FIG. 8, a receiving surface portion 73 c is formed at the distal end portion of the side surface portion 72 of the plug 7, and the receiving surface portion 73 c faces the proximal end side of the most distal washer 18 of the socket 1. Abut. The contact surface 18d in this embodiment functions to restrict the movement of the plug 7 in the major axis direction with respect to the socket 1. However, by providing the contact surface 18d with, for example, the convex portion 16e provided on the washer 16, the sealing performance of the connection structure can be improved when the receiving surface portion 73c and the contact surface 18d contact each other.

  In the example shown in FIG. 8, since the valve body is not installed in the socket 1, the notch 75 at the tip of the plug 7 may not be provided.

  FIG. 9 is a cross-sectional view schematically showing a cross section of the second embodiment of the connection structure according to the present invention. This embodiment shows an embodiment 102 of a connection structure between the socket 2 according to the second embodiment and the plug 7 according to the third embodiment as a plug. FIG. 9 shows a state in which the plug 7 and the socket 2 are fixed so as to restrict their movement in the axial direction (B, A).

  The fitting portion 71 of the plug 7 is received in the housing portion 10 of the socket 2 along the long axis direction B thereof. The long axis direction B of the plug 7 coincides with the long axis direction A of the housing part 10 of the socket 2. In this embodiment, in at least one washer among the washers 16, 17, and 22 provided in the recess 13 of the inner peripheral part 11 of the housing part 10, the inner peripheral surface 16c of the elastic bodies 16b, 17b, and 22b, Portions of the entire circumference of 17c, 22c are in contact with the entire circumference of the side surface 72 of the plug 7, and at least one of the elastic bodies 16b, 17b, 22b is connected to the side surface 72 of the plug 7 and the washers 16, 17 , 22 is subjected to a compression force between at least one annular body 16a, 17a, 22a, and at least one of the elastic bodies 16b, 17b, 22b and the side surface portion 72 of the plug 7 are in close contact with each other. Good. Preferably, of the washers 16, 17, and 22 provided in the recess 13 of the inner peripheral portion 11 of the housing portion 10, at least in the washer 16 and the washer 17, the inner peripheral surfaces 16 c and 17 c of the elastic bodies 16 b and 17 b The part over the entire circumference is in contact with the entire circumference in the circumferential direction of the side surface portion 72 of the plug 7, and the elastic bodies 16 b and 17 b are connected to the side surface portion 72 of the plug 7 and the annular bodies 16 a and 17 a of the washer 17. The elastic body 16 b and the elastic body 17 b are in close contact with the side surface portion 72 of the plug 7 due to the compression force therebetween. FIG. 9 shows such a connection state. However, this connection state may be a state at the beginning of use or after repeated use.

  Also in this embodiment, from the viewpoint of facilitating attachment / detachment while ensuring the sealing property between the plug 7 and the socket 2, the side surface portion 72 of the plug 7 is preferably tapered so as to taper toward the tip side. In this case, the structures of the elastic bodies 16b, 17b, and 22b of the washers 16, 17, and 22 are the same as those described in (i) to (iii) above. In this embodiment, the first embodiment is that the elastic bodies 16b, 17b, 22b of all the washers 16, 17, 22 provided in the socket 2 can slide with the side surface portion 72 of the plug 7. And different. The connection structure 102 of the second embodiment has a larger number of washers than the connection structure 101 of the first embodiment, and when repeatedly used, all the washers and the side surface portion 72 of the plug 7 can be in close contact with each other. The persistence of the sealing performance as a whole structure tends to be relatively high.

  In the present embodiment, a valve body 20 that can be opened and closed is provided on the distal end side of the most distal washer 22 provided on the socket 2. When the plug 7 and the socket 2 are connected, the distal end portion of the plug 7 is provided. The valve body 20 is in an open state because the receiving surface portion 73c contacts the valve body 20. Before the connection between the two, as shown in FIG. 2, the valve body 20 was urged by a spring 21 so as to be in close contact with a washer 22 as a valve seat. In the connected state of the plug 7 and the socket 2, when the fluid flows into the inner cavity 76 from the proximal end side of the plug 7, the fluid flows through the notch 75 into the flow path 14 of the socket 2 without leakage. Can do. At this time, since the filter 15 is provided, dust and the like can be prevented from flowing from the flow path 14 of the socket 2 to the tip side.

  FIG. 10 is a cross-sectional view schematically showing a cross section of the third embodiment of the connection structure according to the present invention. This embodiment shows an embodiment of the connection structure 103 of both when the socket 2 according to the first embodiment is used as a socket and the plug 6 according to the second embodiment is used as a plug. FIG. 10 shows a state in which the plug 6 and the socket 2 are fixed so as to restrict the movement in the axial direction (B, A) thereof. Similarly to the connection structure 102 of the second embodiment, when the fluid flows into the lumen 66 from the proximal end side of the plug 7 in the state shown in FIG. 10, the socket 2 passes through the notch 65. The fluid can be flowed to the flow path 14 without leakage. The function of the filter 15 is as described above.

  The fitting portion 61 of the plug 6 is received by the housing portion 10 of the socket 2 along the long axis direction B thereof. The long axis direction B of the plug 6 coincides with the long axis direction A of the housing part 10 of the socket 2. In this embodiment, in at least one washer among the washers 16, 17, and 22 provided in the recess 13 of the inner peripheral part 11 of the housing part 10, the inner peripheral surface 16c of the elastic bodies 16b, 17b, and 22b, The part of the plug 6 over the entire circumference is in contact with the circumference of the tip side surface part 62b of the side surface part 62 of the plug 6 and at least one of the elastic bodies 16b, 17b, 22b The plug 6 receives at least one of the elastic bodies 16b, 17b, 22b by receiving a compressive force between the distal side surface portion 62b and at least one of the annular bodies 16a, 17a, 22a of the washers 16, 17, 22 It is preferable that the front end side surface portion 62b, that is, the side surface portion 62 is in close contact.

  Further, a receiving surface portion 63a is provided at the proximal end portion of the side surface portion 62 of the plug 6, and the connection structure 103 is configured to be able to contact the contact surface 16d of the washer 16 on the most proximal side.

  Also in this embodiment, from the viewpoint of facilitating attachment / detachment while ensuring the sealing performance of the plug 6 and the socket 1, the tip side surface portion 62b of the side surface portion 62 of the plug 6 is tapered so as to taper toward the tip side. The shape is preferred. Similarly to the above (i) to (iii), the configuration of the elastic bodies 16b, 17b, and 22b of the washers 16, 17, and 22 may be appropriately adopted in accordance with the taper shape of the tip side surface portion 62b of the plug 6. it can.

  In the connected state shown in FIG. 10, the distal end side surface portion 62b of the plug 6 has a tapered shape that tapers toward the distal end side, and the elastic body of the most proximal washer 16 on the proximal end side of the distal end side surface portion 62b. The inner peripheral surface 16c of 16b and the washer 16 are in sliding contact with the proximal end side of the inner peripheral surface 17c of the elastic body 17b of the washer 17 adjacent to the distal end side. Further, the compressive force between the tip side surface portion 62 b of the plug 6 and the annular body 16 a of the washer 16 is larger than the compressive force between the annular body 17 a of the washer 17. The state shown in FIG. 10 is a state that can be assumed as the initial state of use. When the plug 6 is used repeatedly, the insertion width of the plug 6 is increased, and the entire inner peripheral surface 17 c of the elastic body 17 b of the washer 17, the proximal end side of the elastic body 22 b of the washer 22 or the entire inner peripheral surface 22 c is the tip of the plug 6. It can be in contact with the side surface portion 62b.

  In the present embodiment, the innermost peripheral thickness of the most proximal washer 16 is larger than the outer peripheral side, that is, the proximal end surface (contact surface) on the inner peripheral surface 16c side of the elastic body 16b. 16d) is used in which convex portions 16e are formed along the inner periphery. In the state shown in FIG. 10, since the convex part 16e is not fully crushed by the receiving surface part 63a of the plug 6, the effect by the convex part 16e cannot fully be exhibited. In order to make the convex part 16e fully crushed, the thickness of the washers 16, 17, and 22, the amount of compression of the spring 21 when the valve body 20 is opened, and the longitudinal direction of the tip side part 62b What is necessary is just to adjust the length of B suitably. However, at the beginning of use, after repeatedly using it in the state shown in FIG. 10, the size of the lumen surrounded by the inner peripheral surfaces 16c, 17c, 22c of the washers 16, 17, 22 is increased. You may adjust so that the insertion width of the plug 7 may be expanded and the receiving surface part 63a of the plug 7 may have crushed the convex part 16e.

  FIG. 11 is a sectional view schematically showing a section of the fourth embodiment of the connection structure according to the present invention. This embodiment shows an embodiment 104 of a connection structure between the socket 3a according to the third embodiment as a socket and the plug 5 according to the first embodiment as a plug. FIG. 11 shows a state in which the plug 5 and the socket 3a are fixed so as to restrict the movement in the axial direction (B, A) thereof. Similarly to the connection structure 102 of the second embodiment, when the fluid flows into the lumen 56 from the proximal end side of the plug 5 in the state shown in FIG. 11, the socket 3a passes through the notch 55. The fluid can be flowed into the flow path 34a without leakage. The function of the filter 15 is as described above. Further, a female screw portion 32 and a male taper portion 33 are provided on the distal end side of the socket 3a, and can be detachably fixed to other connection tools. In the example shown in FIG. 3A, the female screw portion 32 is provided integrally with the housing portion 10b, but may be provided as a separate member.

  The fitting part 51 of the plug 5 is received in the housing part 10a of the socket 3a along the long axis direction B thereof. The major axis direction B of the plug 5 coincides with the major axis direction A of the housing portion 10a of the socket 3a. In this embodiment, at least one washer among the washers 16 and 17 provided in the recess 13 of the inner peripheral part 11 of the housing part 10a, the entire circumference of the inner peripheral surfaces 16c and 17c of the elastic bodies 16b and 17b. Of the intermediate side surface portion 52b of the side surface portion 52 of the plug 5, and at least one of the elastic bodies 16b, 17b is connected to the intermediate side surface portion 52b of the plug 5 and the washer 16, 17 At least one of the elastic bodies 16b and 17b and the intermediate side surface portion 52b of the plug 5, that is, the side surface portion 52 are in close contact with each other by receiving a compressive force between at least one of the annular members 16a and 17a. It is preferable.

  A receiving surface portion 53a is provided at the base end portion of the side surface portion 52 of the plug 5, a receiving surface portion 53b is provided at the intermediate portion, and a receiving surface portion 53c is provided at the distal end portion. However, in the state shown in FIG. The surface portion 53a and the intermediate receiving surface portion 53b are not in contact with the contact surface 16d of the washer 16 and the contact surface 18d of the washer 18, respectively. Further, even after repeated use, the receiving surface portions 53a and 53b and the contact surfaces 16d and 18d are adjusted so as not to contact.

  Also in this embodiment, from the viewpoint of facilitating attachment / detachment while ensuring the sealing performance between the plug 5 and the socket 3a, the intermediate side surface portion 52b of the side surface portion 52 of the plug 5 is tapered so as to taper toward the tip side. Is preferred. Similarly to the above (i) to (iii), the configuration of the elastic bodies 16b and 17b of the washers 16 and 17 can be appropriately employed according to the taper shape of the intermediate side surface portion 52b of the plug 5.

  In the connection state shown in FIG. 11, the intermediate side surface portion 52b of the plug 5 has a tapered shape that tapers toward the distal end side, and the proximal end side of the intermediate side surface portion 52b has the elastic body 16b of the washer 16 closest to the proximal end side. The inner peripheral surface 16c and the washer 16 are in sliding contact with the proximal end side of the inner peripheral surface 17c of the elastic body 17b of the washer 17 adjacent to the distal end side. Further, the compressive force between the intermediate side surface 52 b of the plug 5 and the annular body 16 a of the washer 16 is larger than the compressive force between the annular body 17 a of the washer 17. The state shown in FIG. 11 is a state that can be assumed as the initial state of use. When used repeatedly, the insertion width of the plug 5 increases, and the contact area between the inner peripheral surface 17c of the elastic body 17b of the washer 17 and the intermediate side surface portion 52b can increase.

  In the present embodiment, as shown in FIG. 11, a gap 80 is formed between the receiving surface portion 53 b of the plug 5 and the contact surface 18 d of the most distal washer 18. Therefore, it is possible to efficiently capture an elastic cutting piece or the like generated by sliding contact between the intermediate side surface portion 52b of the plug 5 and the elastic bodies 16b and 17b of the washers 16 and 17.

  In the present embodiment, as shown in FIG. 11, the washer 16 provided on the most proximal side of the socket 3a is provided with a convex portion 16e for improving the sealing performance when crushed. Since the receiving surface portion 53a of the plug 5 is not adjusted so as to contact the contact surface 16d of the washer 16, the convex portion 16e may not be provided.

  12, 13, and 14 are cross-sectional views schematically showing cross sections of fifth, sixth, and seventh embodiments of the connection structure according to the present invention, respectively. In these embodiments, the socket 3a according to the third embodiment is used as a socket and the plug 5 according to the first embodiment is used as a plug. 12 to 14 show a state where the plug 5 and the socket 3a or the socket 3b (hereinafter referred to as sockets 3a and 3b) are fixed so as to restrict the movement in the axial direction (B and A) thereof. Yes. Similarly to the case of the connection structure 102 of the second embodiment, when a fluid is allowed to flow into the lumen 56 from the proximal end side of the plug 5 in the state shown in FIGS. The fluid can be flowed to the flow paths 34a, b of the sockets 3a, b without leakage. The functions and functions of the filter 15 and the valve body 20 are as described above.

  As shown in FIG. 12, in the connection structure 105, the receiving surface portion 53a formed at the proximal end portion of the side surface portion 52 of the plug 5 abuts on the abutting surface 16d of the washer 16 on the most proximal end side. The receiving surface portion 53c formed at the distal end portion of this is in contact with the valve body 20, and the size of the lumen portion of the washer 18 as a valve seat is smaller than those of the other washers 16,17. Further, the intermediate side surface portion 52b of the plug 5 is in sliding contact with the entire inner peripheral surface 16c of the elastic body 16b of the washer 16 and the proximal end side of the inner peripheral surface 17c of the elastic body 17b of the washer 17, and the elastic body 18b The inner peripheral surface 18c is not in contact with the tip side surface portion 52c. In this case, the shape of at least the intermediate side surface portion 52b of the side surface portion 52 of the plug 5 is tapered so that the front end side is tapered from the viewpoint of ensuring the sealing performance between the plug 5 and the sockets 3a and 3b and the ease of attaching and detaching them. Is preferred. In the present embodiment, as shown in FIG. 12, the receiving surface portion 53a at the proximal end portion of the plug 5 squeezes the contact surface 16d and the convex portion 16e of the washer 16 closest to the proximal end of the sockets 3a and 3b within a predetermined range. Abut. On the other hand, the receiving surface portion 53b of the intermediate portion of the plug 5 does not contact the contact surface 18d of the washer 18, and a gap 81 is formed between them. The action of the gap 81 is the same as that of the connection structure 104 of the fourth embodiment. The state shown in FIG. 12 shows a state at the beginning of use or after some use. By further repeated use from this state, the insertion width of the plug 5 is increased, the contact area between the washer 17 and the elastic body 17b is increased, the degree to which the convex portion 16e is crushed, the contact between the receiving surface portion 53b and the washer 18 is increased. The sealing performance of the entire connection structure can be maintained by contact with the contact surface 18d directly or via a cutting piece.

  As shown in FIG. 13, in the connection structure 106, the receiving surface portion 53a formed at the proximal end portion of the side surface portion 52 of the plug 5 abuts on the abutting surface 16d of the washer 16 closest to the proximal end, and at the intermediate portion. The formed receiving surface portion 53b contacts the contact surface 18d of the most distal washer 18, and the receiving surface portion 53c formed at the distal end portion of the side surface portion 52 contacts the valve body 20 to provide a washer as a valve seat. The size of the lumen portion 18 is smaller than the other washers 16 and 17. Further, the intermediate side surface portion 52b of the plug 5 is in contact with the entire inner peripheral surfaces 16c and 17c of the elastic bodies 16b and 17b of the washers 16 and 17, and the inner peripheral surface 18c of the elastic body 18b of the washer 18 is on the tip side. It is not in contact with the side part 52c. In this case, the shape of at least the intermediate side surface portion 52b of the side surface portion 52 of the plug 5 is tapered so that the front end side is tapered from the viewpoint of ensuring the sealing performance between the plug 5 and the sockets 3a and 3b and the ease of attaching and detaching them. Is preferred. In the present embodiment, as shown in FIG. 13, the receiving surface portion 53a of the base end portion of the plug 5 squeezes the contact surface 16d and the convex portion 16e of the washer 16 closest to the base end of the sockets 3a and 3b within a predetermined range. Abut. The receiving surface portion 53b of the intermediate portion of the plug 5 is in contact with the contact surface 18d of the washer 18 on the most distal side. The contact surface 18d is not provided with a convex portion, but may be provided. The sixth embodiment shown in FIG. 13 is an example in which two places where the receiving surface portion of the plug and the corresponding abutting surface of the washer are in contact with each other are provided. Good. That is, a plurality of portions where the plug and the washer abut may be provided. In this case, in this embodiment, the side surface portion of the plug may be configured to be in sliding contact with the entire inner peripheral surface of the plurality of washer elastic bodies or a part in the longitudinal direction, or the elasticity of one washer. You may comprise so that it may slidably contact with the internal peripheral surface of a body.

  As shown in FIG. 14, in the connection structure 107, the receiving surface portion 53a formed at the proximal end portion of the side surface portion 52 of the plug 5 abuts on the abutting surface 16d of the washer 16 closest to the proximal end, and The formed receiving surface portion 53b contacts the contact surface 18d of the most distal washer 18, and the receiving surface portion 53c formed at the distal end portion of the side surface portion 52 contacts the valve body 20 to provide a washer as a valve seat. The size of the lumen portion 18 is smaller than the other washers 16 and 17. Further, the intermediate side surface portion 52b of the plug 5 slides with the inner peripheral surface 18c of the elastic body 18b of the washer 18 and the entire inner peripheral surfaces 16c and 17c of the elastic bodies 16b and 17b of the washers 16 and 17 and the side surface portion 52c of the distal end side. It touches like touching. In this case, the shape of at least the intermediate side surface portion 52b and the front end side surface portion 52c among the side surface portions 52 of the plug 5 is from the viewpoint of ensuring the sealing performance between the plug 5 and the sockets 3a and 3b and the ease of attaching and detaching them. It is preferable that the tip side is a tapered shape. The configuration in which the distal end side surface portion 52c of the plug is in contact with the inner peripheral surface 18c of the elastic body 18b of the washer 18 may be employed in another embodiment of the present invention. In the present embodiment, as shown in FIG. 14, the receiving surface portion 53a at the proximal end portion of the plug 5 squeezes the contact surface 16d and the convex portion 16e of the washer 16 closest to the proximal end of the sockets 3a and 3b within a predetermined range. Abut. Similarly, the contact surface 18d of the washer 18 may be provided with a convex portion. In the seventh embodiment shown in FIG. 14, the washer 16 at a position corresponding to the intermediate side surface portion 52 b and the front end side surface portion 52 c, which have different sizes in the direction orthogonal to the major axis direction B, of the side surface portions 52 of the plug 5. The inner peripheral surfaces 16c and 17c of the 17 elastic bodies 16b and 17b and the inner peripheral surface 18c of the elastic body 18b of the washer 18 are in contact with each other. That is, when the plug has a plurality of side surface portions having different steps in the direction perpendicular to the long axis direction B in a stepped manner, the plugs can be slidably contacted corresponding to two or more of the side surface portions. It can be set as the structure which provided the washer which has an internal peripheral surface. Thereby, the sealing performance of a plug and a washer can be improved more. At this time, it is preferable that the side surface portion of the plug corresponding to the sliding contact portion has a tapered shape that tapers toward the tip side as described above. In this embodiment, two places where the receiving surface portion of the plug and the corresponding contact surface of the washer are in contact with each other are provided. However, it may be configured to have three or more locations. That is, a plurality of portions where the plug and the washer abut may be provided.

  FIG. 15 is a cross-sectional view schematically showing a cross section of the eighth embodiment of the connection structure according to the present invention. This embodiment shows an embodiment 108 of a connection structure between the socket 4 according to the fifth embodiment and the plug 5 according to the first embodiment as a plug. FIG. 15 shows a state in which the plug 5 and the socket 4 are fixed so as to restrict their movement in the axial direction (B, A). As in the case of the connection structure 102 of the second embodiment, when the fluid flows into the lumen 56 from the proximal end side of the plug 5 in the state shown in FIG. 15, the socket 4 passes through the notch 55. It is possible to flow the fluid into the flow path 34b without leakage. The function of the filter 15 is as described above. Further, a male screw portion 36 is provided on the tip end side of the socket 4 so that it can be detachably fixed to other connecting devices.

  The fitting portion 51 of the plug 5 is received in the housing portion 10 d of the socket 4 along the long axis direction B thereof. The long axis direction B of the plug 5 coincides with the long axis direction A of the housing part 10 d of the socket 4. In the present embodiment, the elastic body 16b of at least one washer among the washers 16 and 17 provided in the recess 13 of the inner peripheral portion 11 of the housing portion 10d and spaced apart in the long axis direction B by the annular member 40. , A portion of the inner peripheral surface 16c of the plug 17 that extends over the entire circumference contacts the entire circumference of the intermediate side surface portion 52b of the side surface portion 52 of the plug 5, and at least one of the elastic bodies 16b, 17b Upon receiving a compressive force between the intermediate side surface portion 52b of the plug 5 and at least one annular body 16a, 17a of the washers 16, 17, at least one of the elastic bodies 16b, 17b and the intermediate side surface of the plug 5 It is preferable that the part 52b, that is, the side part 52 is in close contact. In this embodiment, the washers 16, 17, and 18 are provided apart from each other by the annular members 40 and 41, so that the elastic body of the washer is in close contact with the side surface of the plug. Therefore, compared with the case where adjacent washers are in contact like the connection structures 101 to 107 of the first to seventh embodiments, the adhesion between the washer and the plug is lowered, and the sealing performance of the socket and the plug tends to be lowered. is there.

  As shown in FIG. 15, in the connection structure 108, the receiving surface portion 53 a formed at the base end portion of the side surface portion 52 of the plug 5 abuts on the contact surface 16 d of the washer 16 closest to the base end side. The receiving surface portion 53c formed at the distal end portion of this is in contact with the valve body 20, and the size of the lumen portion of the washer 18 as a valve seat is smaller than those of the other washers 16,17. Further, the intermediate side surface portion 52b of the plug 5 is in sliding contact with the entire inner peripheral surface 16c of the elastic body 16b of the washer 16 and the proximal end side of the inner peripheral surface 17c of the elastic body 17b of the washer 17, and the elastic body 18b The inner peripheral surface 18c is not in contact with the tip side surface portion 52c. In this case, at least the intermediate side surface portion 52b of the side surface portion 52 of the plug 5 has a tapered shape in which the tip end side is tapered from the viewpoint of securing the sealing performance between the plug 5 and the socket 4 and easy attachment / detachment thereof. Is preferred.

  In the present embodiment, as shown in FIG. 15, the receiving surface portion 53a at the proximal end portion of the plug 5 contacts the contact surface 16d of the washer 16 on the most proximal end side of the socket 4 and the convex portion 16e within a predetermined range. It touches. On the other hand, the receiving surface portion 53b of the intermediate portion of the plug 5 does not contact the contact surface 18d of the washer 18, and a gap 82 is formed between them. The action of the gap 82 is the same as that of the connection structure 104 of the fourth embodiment, but the gap is larger because the annular member 41 is provided in the present embodiment. The state shown in FIG. 15 shows a state at the beginning of use or after use to some extent. By further repeated use from this state, the insertion width of the plug 5 is increased, the contact area between the washer 17 and the elastic body 17b is increased, the degree to which the convex portion 16e is crushed, the contact between the receiving surface portion 53b and the washer 18 is increased. The sealing performance of the entire connection structure can be maintained by contact with the contact surface 18d directly or via a cutting piece.

  The plug and socket connection structure as described above can be suitably used for connecting tubes and connecting tubes and various devices. In particular, in applications where a pressure of 4 MPa or more is applied when the socket and the plug are connected, good sealing performance can be ensured even when the plug and the socket are repeatedly attached and detached.

  Conventionally, such a socket has been formed of metal. However, in the present invention, the load applied to the housing portion is reduced because the pressure is received by the aforementioned washer. Therefore, the material constituting the housing portion of the socket is reduced. It is possible to use a synthetic resin, and the weight and size of the socket can be reduced. A synthetic resin can also be used for the plug. Therefore, the connection structure can be reduced in weight and size. In addition, by using a wear-resistant material such as metal for the plug, the socket washer elastic body can be consumed, and the plug can be configured as maintenance-free.

  For example, when measuring the air tightness of a medical catheter such as a balloon catheter, a socket is connected to a hub connected to the proximal end side of the medical catheter, a plug is further connected to the socket, and a tube connected to the plug Compressed air is sent from the hub to the lumen of the medical catheter, and the hermeticity is measured when a pressure of about 4 MPa is applied. FIG. 16 is an explanatory diagram for explaining an example of a connection state when the plug 5 and the socket 3a are connected to the hub 93 of the medical catheter 92 at that time. In this example, the hub 93 and the socket 3 a are connected via the connection tool 90. This is because, when many medical catheters are repeatedly inspected, the female screw portion 32 at the distal end portion of the socket 3a connected to the hub 93 is worn and the pressure resistance is lowered. Some are intended to avoid replacement. The connector 90 is preferably configured using a material having high pressure resistance such as metal or polycarbonate, but is configured using a resin material such as polyamide that does not necessarily have high pressure resistance, and is about 4 MPa. Even if there is a portion that is deformed when the pressure is applied and cannot be kept hermetically sealed, the pressure resistance of the connector 90 can be secured by reinforcing the portion with a reinforcing member. In the example shown in FIG. 16, a cylindrical portion 94 having a small member thickness and low pressure resistance exists on the proximal end side (side connected to the socket 3 a) of the connection tool 90, but by using the reinforcing member 91, 4 MPa Even when a certain level of pressure is applied, fluid leakage can be prevented. As a good member as the reinforcing member 91, a heat shrinkable tube formed of a material such as polyolefin, a fluorine resin, or a thermoplastic elastomer, a tape formed of a material such as a polyimide resin, a polyamide resin, or glass fiber may be used. . These may be used alone or in combination. For example, in the case of a tape formed of a material such as polyimide resin, the number of windings may be adjusted as appropriate depending on the thickness, but when the tape thickness is 0.020 to 0.30 mm, the portion with low pressure resistance It is preferable that one or more windings be wound around. Such a configuration of the connection tool is suitable for obtaining a high pressure-resistant connection tool using a commercially available connection tool.

1, 2, 3a, 3b, 4 Socket 5, 6, 7 Plug 10 Housing part 11 Inner peripheral part 12 Opening part 13, 43 Recessed part 14 Flow path 15 Filter 16, 17, 18, 22 Washer 16a, 17a, 18a, 22a Ring body 16b, 17b, 18b, 22b Elastic body 16c, 17c, 18c, 22c Inner peripheral surface 16d, 18d Abutting surface 19 Bottom 20 Valve body 21 Spring 30 Male screw fitting part 31 Female screw fitting part 31a Step part 32 Female thread part 33 Male taper part 34a, 34b Flow path 35a, 35b Front end side opening part 36 Male thread part 40, 41 Annular member 50, 60, 70 Body part 51, 61, 71 Fitting part 52, 62, 72 Side face part 52a, 62a Base end side surface portion 52b Intermediate side surface portion 52c, 62b Tip end side surface portion 53a, 53b, 53c, 63a, 63b, 63c, 73c Reception surface portion 54, 6 , 74 Tip opening 55, 65, 75 Notch 56, 66, 76 Lumen 57 Tube joint 58 Tube 59 Connecting portion 80, 81, 82 Gap 90 Connector 91 Reinforcement member 92 Medical catheter 93 Hub 94 Tubular Portions 101, 102, 103, 104, 105, 106, 107, 108 Connection structure A, B Long axis direction

Claims (18)

A socket that can be connected to a plug having a cylindrical fitting part having a side part,
A housing part that removably receives the fitting part along the longitudinal direction of the fitting part;
An annular body made of a material having a compressive strength at 5% deformation of 4 MPa or more provided in the inner circumferential part of the housing part along the major axis direction of the housing part, and a vicinity part on at least the inner circumferential side of the annular body A washer having an annular elastic body formed over the entire circumference of
In at least one of the plurality of washers, the annular elastic body forms an annular slidable contact portion that slidably contacts the entire circumference of the side surface portion of the plug. The plug has an annular receiving surface portion facing a distal end side formed at at least one selected from a base end portion, an intermediate portion and a distal end portion of the side surface portion,
The socket according to claim 1, wherein at least one of the plurality of washers provided has a contact surface that can contact a receiving surface portion of the plug corresponding to the elastic body.   The socket according to claim 1 or 2, wherein at least some adjacent ones of the plurality of washers are in contact with each other.   4. The thickness in the major axis direction of the housing portion in the elastic body of at least one of the washers provided in a plurality is provided in any one of claims 1 to 3, wherein the inner peripheral side of the washer is thicker than the outer peripheral side. The listed socket.   The most proximal washer among the plurality of washers has an abutment surface capable of abutting with a receiving surface portion formed at a proximal end portion of the side surface portion of the plug in the elastic body. The socket according to claim 1. By having a plurality of side surface portions having different sizes in the cross-sectional direction orthogonal to the major axis direction, it can be connected to a plug having a plurality of receiving surface portions formed at least in the intermediate portion and the base end portion,
2 or more and a total number or less of the said washer provided in multiple has the contact surface which can each contact | abut with the receiving surface part of the said plug corresponding to each washer in each elastic body. Socket described in the section. A valve body that is openable and closable is provided on the front end side of the most end side washer among the plurality of washers provided,
The socket according to any one of claims 1 to 6, wherein the valve body is biased and closed so as to be in close contact with the most distal washer as a valve seat.   The socket according to any one of claims 1 to 7, wherein a size of a lumen portion of the most distal washer is smaller than other washers.   The socket according to any one of claims 1 to 8, wherein a filter is installed closer to a distal end side than a frontmost washer among the plurality of washers.   The socket according to claim 9, wherein a filter is installed on the tip side of the valve body.   The socket as described in any one of Claims 1-10 in which the material which comprises the annular body of the said washer, and the material which comprises the elastic body of the said washer contain the same kind of polymer component. A plug-and-socket connection structure for connecting the plug and socket with a good seal and detachable,
The plug has a cylindrical fitting part having a side part,
A plurality of the sockets are provided along the major axis direction of the housing part, and a housing part that detachably receives the cylindrical fitting part along the major axis direction of the plug, and an inner peripheral part of the housing part. A washer having an annular body made of a material having a compressive strength of 5 MPa or more at 5% deformation and an annular elastic body formed over the entire circumference of at least the vicinity of the inner circumference of the annular body,
In at least one of the plurality of washers provided, the fitting portion of the plug is connected to the housing portion so that the annular elastic body is in sliding contact with the entire circumference in the circumferential direction of the side surface portion of the plug. The plug and the socket are fixed so as to restrict their axial movement, and the elastic body receives a compressive force between the side surface portion of the plug and the annular body of the washer. Plug and socket connection structure with washer in close contact. The plug has an annular receiving surface portion facing a distal end side formed at at least one selected from a base end portion, an intermediate portion and a distal end portion of the side surface portion,
The plug / socket connection structure according to claim 12, wherein at least one of the plurality of washers provided has a contact surface that contacts a receiving surface portion of the plug corresponding to the elastic body.   The plug-and-socket connection structure according to claim 12 or 13, wherein a side surface of the plug has a structure that tapers toward a tip end side. A valve body that is openable and closable is provided on the front end side of the most end side washer among the plurality of washers provided,
The valve body is urged and closed so as to be in close contact with the most distal washer as a valve seat, and when the plug is connected to a socket, the receiving surface portion of the distal end portion of the side surface portion of the plug is The plug and socket connection structure according to any one of claims 12 to 14, wherein the plug and socket are opened by abutting against the valve body.   The receiving surface portion formed at the base end portion of the side surface portion of the plug contacts the contact surface of the most proximal washer, and the receiving surface portion formed at the distal end portion of the side surface portion contacts the valve body, The plug-and-socket connection structure according to claim 15, wherein a size of a lumen portion of the washer as a valve seat is smaller than that of the other washer. A plug connectable with the socket according to any one of claims 1 to 11,
A cylindrical fitting portion having a side surface portion in sliding contact with the sliding contact portion of the washer;
An annular receiving surface portion facing the distal end formed at least at the base end portion and the intermediate portion of the side surface portion,
The receiving surface portion is a plug having a smaller size in the cross-sectional direction perpendicular to the long axis direction on the distal end side of the side surface portion. The plug according to claim 17, wherein a side surface portion of the plug has a structure that tapers toward a distal end side.

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