JP5869090B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint for connecting and connecting pipes through which fluid flows.

  2. Description of the Related Art Conventionally, a pipe joint that connects and connects pipes through which fluid flows is known (see, for example, Patent Document 1). The pipe joint shown by this patent document 1 is provided with the plug and the socket, and a plug is detachably attached to the socket. The socket is provided on a socket main cylinder (hereinafter referred to as a main cylinder), a sliding ring (hereinafter referred to as an inner cylinder) provided on the inner periphery of the main cylinder, and an outer periphery of the main cylinder. An operating sleeve (hereinafter referred to as an outer cylinder), and the inner cylinder and the outer cylinder are axially movable with respect to the main cylinder, and the front end side of the main cylinder It is energized towards. The outer cylinder is provided with a bulging portion that bulges toward the center on the inner peripheral surface thereof. The main cylinder has a through-hole penetrating inward and outward in its peripheral wall. A locking member is disposed in the through-hole. When the plug is not connected to the socket (plug is not connected), the locking member is positioned radially outward of the inner cylinder body. The movement of the outer cylindrical body toward the distal end side of the main cylindrical body is regulated by the surface of the bulging portion of the outer cylindrical body coming into contact with the member. On the other hand, the plug is provided with a groove on its outer peripheral surface. When this plug is inserted into the main cylinder of the socket, the tip of the plug comes into contact with the tip of the inner cylinder, and by continuing the insertion as it is, the through hole and the inner cylinder are displaced in the axial direction, and the locking member Enters the groove of the plug. At the same time, the outer cylinder moves to the front end side of the main cylinder after the movement restriction to the front end side of the main cylinder is released. Then, the locking member abuts on the inner surface of the bulging portion of the outer cylinder and becomes immovable, so that the connection state between the plug and the socket is locked.

  In the pipe joint shown in Patent Document 1, in a state where the plug and the socket are connected, seal portions are provided at a plurality of locations in order to prevent leakage of fluid passing through the pipe joint. In the embodiment shown in FIGS. 1 to 3 of Patent Document 1, between the plug tip and the inner cylinder (packing 5 of Patent Document 1), and between the plug tip and the main cylinder (Patent Document 1). Double seals are formed in the O-ring 14). Thus, even if fluid leaks from the seal portion between the plug tip and the inner cylinder, the seal portion between the plug tip and the main cylinder tries to prevent the leakage.

  However, since the pipe joint shown in FIGS. 1 to 3 of Patent Document 1 has a configuration in which the two seal portions both seal against the plug tip portion, there are the following problems. Since the socket and the plug are detachable, the plug is liable to be adhering to dust, dust, or the like, particularly at the tip thereof when detached from the socket. If the plug is inserted into the socket with dust or dust attached to the plug tip, the dust or dust is sandwiched between the plug tip, the packing 5 and the O-ring 14. That is, even if the double seal structure is provided, in this case, there is a possibility that the fluid flowing through the inside may leak.

  On the other hand, in the pipe joint shown in FIGS. 4 to 7 of the same document, the seal portion is between the plug tip portion and the inner cylinder body (packing 5 of Patent Document 1), and the tip side from the through hole in the main cylinder body. Between the portion and the plug (packing 35 of Patent Document 1), between the portion on the tip side of the through hole in the main cylinder and the outer cylinder (O-ring 37 of Patent Document 1), and the main cylinder A seal portion is formed between the portion on the opposite side of the front end side from the through hole and the outer cylinder (packing 39 of Patent Document 1). According to this, fluid leaks from the seal part between the plug tip part and the inner cylinder due to dust or dust adhering to the plug tip part, and the gap between the inner peripheral end of the through hole and the locking member Even if the fluid tries to flow outside through the seal portion, leakage can be prevented by the seal portion formed between the main cylinder and the outer cylinder.

JP 2001-295976 A

  By the way, in this pipe joint, in order to detach the plug connected to the socket, the outer cylinder urged toward the front end of the main cylinder is opposed to the front end side of the main cylinder against the urging force. It is sufficient to make it slide. However, this pipe joint is provided with two seal portions provided between the main cylindrical body and the outer cylindrical body on both sides in the axial direction of the through hole, and for improving the sealing performance, The thickness of the seal member pressed against the outer cylinder is increased. That is, in order to slide the outer cylinder to the side opposite to the main cylinder tip side, it is necessary to resist the frictional force of the seal member in addition to the biasing force biased to the main cylinder tip side. Therefore, there has been a problem that the operation force becomes enormous.

  Moreover, two seal portions provided between the main cylinder and the outer cylinder are required on both sides in the axial direction of the through hole, and these need to be formed over the entire circumference of the main cylinder. For this reason, there is a problem that a long seal member is necessary in this portion.

  Moreover, since the seal member is provided between the main cylinder and the outer cylinder and has a considerable thickness, when the length of the pipe joint in the radial direction is designed to be small, it is intended to be compact. , There was a risk of hindering its compactification.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to reliably prevent fluid leakage even if dust or dust adheres to the plug tip, and in addition, an outer cylinder. It is an object of the present invention to provide a pipe joint that enables the diameter to be reduced even when it is intended to simplify the seal member and to reduce the size by reducing the diameter.

  In order to solve the above problems, the pipe joint of the present invention has the following configuration.

A main cylinder having a plug and a socket, the plug having a groove provided on an outer peripheral surface, the plug being inserted into the socket and having a through-hole in the peripheral wall; and the main cylinder An inner cylinder which is provided on the inner peripheral side of the body, is movable in the axial direction of the main cylinder and is urged toward the distal end side of the main cylinder, and is provided on the outer peripheral side of the main cylinder. An outer cylinder body that is movable in the axial direction of the body and is urged toward the distal end side of the main cylinder body, and a bulging portion is formed on the inner peripheral surface, and is movable in the inner and outer diameter directions in the through hole. And the locking member is positioned radially outward from the outer peripheral surface of the inner cylinder and a part of the locking member is part of the main cylinder when the plug is not connected. It protrudes from the outer peripheral surface, and the portion protruding from the outer peripheral surface of the main cylinder comes into contact with the bulging portion of the outer cylinder. Therefore, when the plug is inserted into the socket in the plug non-connected state, the inner cylinder pressed against the tip of the plug is the main cylinder. The locking member, which is moved to the opposite side of the body tip side and biased in the radial direction, moves in the radial direction, a part of the locking member enters the groove of the plug, and the outer cylindrical body is the main cylindrical body The plug is connected to the socket so that the connection state between the plug and the socket is locked by moving to the distal end side and contacting the inner surface of the bulging portion of the outer cylindrical body with the portion opposite to the portion where the locking member is inserted. A pipe joint in which a seal portion for performing a primary seal is formed between the tip portion of the plug and the inner cylinder, and the plug and the socket are connected to each other in the main cylinder. Between the inner peripheral surface on the tip side of the through hole and the outer peripheral surface of the plug, Beauty, the inner peripheral surface at two positions sealing portion for performing secondary seal and is formed, the penetrating tip side than the hole in the main cylindrical body between the inner peripheral end of the locking member and the through hole The seal portion between the plug and the outer peripheral surface of the plug is constituted by a seal member in a seal member accommodating portion that is recessed in the inner peripheral surface of the main cylinder, and the seal member accommodating portion is the main cylinder It is comprised so that it may open | release toward only the axial side of the said main cylinder in the location located in the said through-hole side rather than the front-end | tip of this.

  According to such a configuration, when the plug is connected to the socket, dust or dust is temporarily attached to the plug tip, and fluid leaks from the seal portion between the plug tip and the inner cylinder. Even so, it is possible to prevent leakage of the fluid between the portion on the tip side of the through hole of the main cylindrical body and the plug, and between the locking member and the inner peripheral end of the through hole. At this time, since it is not necessary to interpose a seal portion between the main cylinder and the outer cylinder, the frictional force by the seal member between the main cylinder and the outer cylinder can be eliminated. Therefore, the operation force for moving the outer cylinder relative to the main cylinder is small. And since it is not necessary to interpose a seal part between a main cylinder and an outer cylinder, it is also possible to abbreviate | omit the long seal member covering the outer periphery perimeter of a main cylinder. In addition, since the seal member between the main cylinder and the outer cylinder can be omitted, it is possible to reduce the diameter of the pipe joint in the radial direction and to reduce the size.

  In the pipe joint of the present invention, the seal portion between the inner peripheral surface on the tip side of the through hole in the main cylinder and the outer peripheral surface of the plug has the through hole and the tip in the main cylinder. It is preferable that the seal member is provided on the inner peripheral surface between the plug and the outer peripheral surface of the plug.

  According to the pipe joint of the present invention, even if dirt or dust adheres to the tip of the plug, it is possible to reliably prevent fluid leakage, and the outer cylinder body is easy to operate, and the seal member is simplified. In addition, even when trying to achieve a compact size by reducing the diameter, the diameter can be reduced.

It is the side view which fractured | ruptured some pipe joints of one Embodiment (Embodiment 1) of this invention. It is the side view which fractured | ruptured a part of socket same as the above. It is a side view of a socket same as the above. It is a side view of a plug same as the above. It is the side view which fractured | ruptured a part of pipe joint of other embodiment (Embodiment 2).

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  The pipe joint of Embodiment 1 is used to connect a gas supply device such as a rice cooker, a gas stove, or a gas fan heater to a gas supply source. This pipe joint is composed of a plug 1 and a socket 4, and the plug 1 is attached to the end of the gas tube connected to the gas supply source side, and at the end of the gas tube connected to the gas equipment. A socket 4 is attached. By attaching the plug 1 to the socket 4, the gas tube on the gas supply source side and the gas tube on the gas equipment side are connected in communication. Hereinafter, for convenience of explanation, in the socket 4, the side connected to the plug 1 is the distal end side, and the side connected to the gas tube is the proximal end side. In the plug 1, the side connected to the socket 4 is one end side, and the side connected to the gas tube is the other end side.

  As shown in FIG. 4, the plug 1 is detachably inserted into and attached to the socket 4, and a flow passage 12 communicating from one end side to the other end side is formed inside. The plug 1 is provided in one end side of the plug tip 13 which is a part to be inserted into the socket 4, an attachment part 14 provided on the other end side and connected to the gas tube, and provided in the flow passage 12. And an opening / closing valve 15 for opening and closing the passage 12. The plug tip portion 13 has a cylindrical shape, and a groove portion 11 is formed on the outer peripheral surface of the plug tip portion 13 over the entire circumference. As shown in FIG. 4, the groove 11 has a first inclined surface 16 that is inclined so as to be positioned in the radially inward direction toward one end side, and a diameter that is continuous from the end portion on the inner diameter side of the inclined surface. It has the 2nd inclined surface 17 inclined so that it may be located in an outward direction, and it is the groove part 11 which made the inclined surface 16 and 17 the cross-sectional substantially V shape. A seal member abutting portion 18 is provided at one end opening end of the plug distal end portion 13, and the seal member abutting portion 18 is positioned closer to one end as it approaches the opening edge of the flow passage 12. It has a raised shape.

  The flow passage 12 has a large-diameter portion 19 that partially extends in the radially outward direction, and an opening / closing valve 15 is provided in the large-diameter portion 19. The on-off valve 15 includes a valve body 150 that is slidable in the axial direction of the flow passage 12 and a biasing spring that biases the valve body 150 toward one end of the large-diameter portion 19. Member 151. The on-off valve 15 stops the fluid flow by pressing the valve body 150 against the end of the large diameter portion 19 by the urging member 151. On the other hand, when the valve body 150 is pressed against the urging force from one end side to the other end side, the on-off valve 15 separates the valve body 150 from the end of the large-diameter portion 19 so that the fluid flows. Is acceptable.

  The mounting portion 14 has a protruding portion 141 that protrudes radially outward at the end on the other end side, and the gas tube attached by the protruding portion 141 is difficult to come off.

  In addition, the gas tube (not shown) used by this embodiment has flexibility, for example, is comprised with the rubber hose. By this gas tube, combustion gas such as city gas and LP gas is supplied to the gas equipment through the pipe joint.

  The socket 4 locks and fixes the plug 1 inserted therein, and can also release the lock when necessary. The plug 1 is detachable while preventing the plug 1 from being unintentionally disconnected. Hold. As shown in FIGS. 2 and 3, the socket 4 includes a cylindrical main cylinder 5 constituting the main body of the socket 4, an inner cylinder 6 provided on the inner peripheral side of the main cylinder 5, An outer cylindrical body 7 provided on the outer peripheral side of the cylindrical body 5, a locking member 8 that locks the connection state between the socket 4 and the plug 1, and a cover member 41 that covers the outer peripheral side of the main cylindrical body 5. Yes.

  The main cylinder 5 has a hollow cylindrical shape, and the plug 1 is inserted on the distal end side, and a gas tube connected to a gas device is connected on the proximal end side. The main cylinder 5 is provided with a plurality of through holes 52 penetrating inward and outward in the peripheral wall 51, and the through holes 52 are equally arranged in the circumferential direction. The main cylindrical body 5 is provided with a cylindrical attachment portion 53 to which a gas tube is connected from the end portion on the proximal end side of the peripheral wall 51 toward the proximal end side. The main cylinder 5 is provided with an inner cylinder part 54 concentric with the peripheral wall 51 in the inside thereof, and a communication path 55 is formed over the inner cylinder part 54 and the attachment part 53. The communication passage 55 communicates with the flow passage 12 of the plug 1 when the plug 1 is inserted into the main cylinder 5. The inner cylindrical portion 54 and the peripheral wall 51 are spaced from each other in the radial direction, and an annular inner cylindrical body accommodating portion 56 is formed between the inner cylindrical portion 54 and the peripheral wall 51 portion. The opening end portion on the front end side of the main cylinder body 5 is provided with a main cylinder flange portion 57 that protrudes in the radially outward direction. It is installed. The seal member accommodating portion 58 is provided with an annular seal member 910 having a substantially X-shaped cross section. The seal member 910 is made of, for example, synthetic rubber.

  The main cylinder 5 is provided with an opening / closing valve pressing piece 59 at the center thereof. The on-off valve pressing piece 59 extends from the side wall of the inner cylinder portion 54 toward the distal end side along the central axis of the main cylinder 5, and the distal end thereof is substantially at the same position as the opening edge of the socket 4 distal end side. Protrudes up to. When the plug 1 is inserted into the socket 4, the on-off valve pressing piece 59 presses the valve element 150 of the on-off valve 15 of the plug 1 from one end side to the other end side of the plug 1, The valve 15 is opened.

  The inner cylinder 6 is slidably disposed in the inner cylinder housing portion 56 of the main cylinder 5. The inner cylinder body 6 is fitted on the outer periphery of the inner cylinder portion 54 of the main cylinder body 5 and moves coaxially with the inner cylinder portion 54 in the distal end proximal direction (axial direction). The inner cylinder 6 is connected at its proximal end to a biasing body 60 made of a spring whose one end is in contact with the bottom of the inner cylinder housing portion 56 at its proximal end. The body 60 is elastically biased toward the distal end side. The inner cylindrical body 6 has a locking protrusion 61 on the outer peripheral surface, and the locking protrusion 61 is locked to a locked portion 50 provided on the inner peripheral surface of the main cylindrical body 5. The inner cylindrical body 6 is prevented from falling off toward the tip end by the locking projection 61. Further, the inner cylinder 6 is provided with an action portion 62 having a large diameter so as to abut or face the inner peripheral surface of the main cylinder 5 on the tip side. The action portion 62 is positioned substantially at the same position as the through hole 52 of the main cylinder 5 in the radial direction in a state where the inner cylinder 6 is urged toward the distal end side by the urging body 60. . A seal member 900 is fixed to the open end of the action portion 62 over the entire circumference. The seal member 900 is made of a rubber material made of synthetic rubber or the like. Further, a seal member recess 63 is formed in the inner peripheral surface of the base end side end portion of the inner cylinder 6. By disposing the seal member 930 in the seal member recess 63, the inner cylinder body is provided. 6 is capable of sliding while maintaining an airtight seal with the inner cylinder portion 54 of the main cylinder 5. The seal member 930 disposed in the seal member recess 63 is formed by using an annular seal member 930 having a substantially X-shaped cross section, similar to that disposed in the seal member accommodating portion 58. Yes.

  The outer cylinder body 7 is provided on the outer peripheral side of the main cylinder body 5 and is slidable in the distal end proximal direction. The outer peripheral surface of the outer cylindrical body 7 is a first sliding contact surface 72 that contacts the outer peripheral surface of the main cylindrical body flange portion 57 of the main cylindrical body 5. The outer cylindrical body 7 has a bulging portion 71 that protrudes toward the center from the proximal end of the first sliding contact surface 72, and the inner surface of the bulging portion 71 is the peripheral wall of the main cylindrical body 5. It becomes the 2nd sliding contact surface 73 which contacts 51 outer surface. The side surface on the distal end side of the bulging portion 71 is a locking member pressing surface 74 that is inclined so as to have a larger diameter toward the distal end side. The first sliding contact surface 72 and the second sliding contact surface 73 are It continues through the locking member pressing surface 74. The outer cylindrical body 7 is connected to a biasing body 75 made of a spring whose one end is in contact with the cover member 41 at an end portion on the base end side, and is biased to the distal end side by the biasing body 75. ing. The outer cylindrical body 7 is a range from the portion where the bulging portion 71 is located at least on the proximal end side with respect to the through hole 52 of the main cylindrical body 5 to the surface on the proximal end side of the main cylindrical body flange portion 57. It is designed to move by sliding. A flange portion 76 projects outwardly from the opening end on the distal end side of the outer cylinder 7.

  The locking member 8 is disposed in the through hole 52 of the main cylinder 5 and is a member that locks / unlocks the plug 1 by moving in the radial direction. The locking member 8 of the present embodiment includes a spherical steel ball 81 formed of stainless steel, and a seal member 82 such as rubber coated on the outer surface (outer peripheral surface) of the steel ball 81. In this locking member 8, the steel ball 81 serving as a spherical core has a slightly smaller diameter than the through hole 52 of the main cylinder 5, but is slightly smaller than the through hole 52 by being coated with the seal member 82. Large diameter. As a result, the locking member 8 is movable in the radial direction while hermetically sealing the through hole 52. The locking member 8 has an outer diameter longer than the length of the main cylinder 5 in the thickness direction.

  The cover member 41 is fixed to the peripheral wall 51 of the main cylinder 5, and an outer cylinder housing portion 42 for securing a movement allowance of the outer cylinder 7 is provided between the cover member 41 and the outer peripheral surface of the main cylinder 5. Is formed. Further, a biasing body mounting portion 43 is recessed in the back surface on the proximal end side of the outer cylinder housing portion 42, and the back surface of the biasing body mounting portion 43 is connected to the outer cylinder body 7. One end of the urging body 75 is attached.

  The socket 4 having such a configuration is in the following state when the plug 1 is not attached (plug disconnected state). The inner cylinder 6 provided inside the main cylinder 5 is positioned on the distal end side by the urging body 60, and the action part 62 is positioned so as to overlap in the radial inner direction of the through hole 52. The locking member 8 disposed in the through hole 52 is in contact with the radially outward surface of the action portion 62, and a part of the locking member 8 protrudes from the outer peripheral surface of the main cylinder 5. Yes. A portion of the locking member 8 protruding from the main cylinder 5 is in contact with the locking member pressing surface 74 of the bulging portion 71 of the outer cylinder 7. At this time, the locking member 8 is pushed down in the radially inward direction by the outer cylindrical body 7, but cannot move because the action portion 62 is positioned in the radially inward direction. Therefore, the outer cylinder body 7 biased toward the distal end side is in a state where movement toward the distal end side is restricted, and the outer cylindrical body 7 is stationary while the bulging portion 71 is in contact with the locking member 8.

  When the plug 1 is connected to the socket 4 (see FIG. 1), it operates as follows. When the plug 1 is inserted into the socket 4 in the plug non-connected state, the seal member abutting portion 18 of the plug distal end portion 13 abuts on the seal member 900 provided in the action portion 62 of the inner cylinder 6 of the socket 4. When the plug 1 is further pushed in from this state, the inner cylinder 6 of the socket 4 moves to the proximal end side against the urging force, and at the same time, the action portion 62 is pivoted with respect to the radial position of the through hole 52. Deviation in direction. Then, the locking member 8 urged by the locking member pressing surface 74 enters the groove portion 11 of the plug distal end portion 13. When the locking member 8 enters the groove portion 11 of the plug distal end portion 13 and moves in the radially inward direction, the outer cylinder 7 is released from the restricted state that is restricted by the locking member 8, and the biasing body 75. It moves to the tip side by the urging force. Then, the second slidable contact surface 73 of the bulging portion 71 is positioned in the radially outward direction of the through hole 52 and comes into contact with the locking member 8. In this state, the plug 1 is urged in the direction from the proximal end side to the distal end side of the socket 4 by the urging force of the urging body 60 connected to the inner cylindrical body 6 of the socket 4. 8 is pushed outward in the radial direction, but since the bulging portion 71 of the outer cylindrical body 7 is located in the radial outward direction, the locking member 8 is immovable. As a result, the connection state between the plug 1 and the socket 4 is locked.

  At the same time when the plug 1 and the socket 4 are connected, the on / off valve pressing piece 59 of the socket 4 opens the on / off valve 15 of the plug 1 by inserting the plug 1, and the plug 1 side gas tube and the socket 4 side are opened. The gas tube communicates.

  At this time, in the pipe joint of the present embodiment, seal portions are formed at a plurality of locations between the plug 1 and the socket 4 in order to prevent leakage of fluid flowing through the inside. As shown in FIG. 1, the pipe joint of the present embodiment includes a plug 1 between the plug distal end portion 13 and the inner cylindrical body 6 (first seal portion 90) and an inner peripheral edge on the distal end side of the main cylindrical body 5. (Second seal portion 91), between the locking member 8 and the inner peripheral end of the through hole 52 (third seal portion 92), and the inner cylinder portion 54 and the inner cylinder body of the main cylinder 5 Seal portions are formed at a total of four points between the first and second portions (fourth seal portion 93). That is, the pipe joint of the present embodiment is configured such that the first seal portion 90 and the fourth seal portion 93 perform the primary seal, and the second seal portion 91 and the third seal portion 92 perform the secondary seal. Even if no seal portion is provided between the main cylindrical body 5 and the outer cylindrical body 7, the leak can be reliably prevented.

  On the other hand, to remove the plug 1 from the plug-connected socket 4, the outer cylinder 7 of the socket 4 is moved to the proximal end side of the socket 4. The inner surface of the bulging portion 71 of the outer cylindrical body 7 is shifted toward the proximal end side in the axial direction with respect to the locking member 8, and the first sliding contact surface 72 of the outer cylindrical body 7 is positioned radially outward of the locking member 8. Then, the locking member 8 that has been urged so as to be pushed out by the second inclined surface 17 of the plug 1 is movable in the radially outward direction, moves in the radially outward direction, and releases the locked state. Then, the plug 1 that has been urged from the proximal end side toward the distal end side of the socket 4 via the inner cylindrical body 6 is pushed out in a direction away from the socket 4. At the same time, the inner cylinder 6 moves to the inside of the diameter of the locking member 8, and the action part 62 of the inner cylinder 6 is located inside the diameter of the locking member 8 and contacts the top of the inside of the diameter of the locking member 8. Touch. Then, the bulging portion 71 of the outer cylindrical body 7 comes into contact with the locking member 8 protruding outward from the outer peripheral surface of the main cylindrical body 5, and the movement to the distal end side of the outer cylindrical body 7 is restricted. As a result, the socket 4 returns to the plug non-connected state. At this time, the on-off valve 15 of the plug 1 that has been opened by the on-off valve pressing piece 59 is closed simultaneously with the separation from the socket 4 and closes the flow of fluid from the gas supply source.

  By the way, the plug 1 of this pipe joint has a structure in which dust, dust or the like easily adheres to the plug tip 13 when the socket 4 and the plug 1 are detached. For this reason, if the plug 1 and the socket 4 are connected with dust or dust attached to the plug tip 13, it may be considered that the seal formed between the plug tip 13 is insufficiently adhered or a gap is generated. It is done. However, even in such a case, the pipe joint of the present embodiment is provided between the plug 1 and the portion on the tip side of the through hole 52 of the main cylinder 5 and between the locking member 8 and the through hole 52. The fluid is hermetically sealed at a portion where dirt or dust is difficult to adhere, such as between the inner peripheral edge. As a result, fluid leakage can be reliably prevented.

  Moreover, the structure of the pipe joint of this embodiment does not need to interpose a seal part between the main cylinder 5 and the outer cylinder 7, and is based on the seal member between the main cylinder 5 and the outer cylinder 7. Since the frictional force can be eliminated, the operating force for moving the outer cylinder 7 relative to the main cylinder 5 can be reduced. In addition, since there is no need to interpose a seal portion between the main cylinder 5 and the outer cylinder 7, a long seal member extending over the entire outer periphery of the main cylinder 5 can be omitted. In addition, since the seal member between the main cylinder 5 and the outer cylinder 7 can be omitted in this way, the radial size of the pipe joint can be reduced and the size can be reduced.

  In the pipe joint of the present embodiment, the third seal portion 92 between the locking member 8 and the inner peripheral end of the through hole 52 can be formed simply by coating the locking member 8 with the sealing member 82. There is an advantage that the formation of the seal portion is easy. Moreover, when the sealing performance between the locking member 8 and the inner peripheral end of the through hole 52 is lowered, the sealing performance can be improved again only by replacing the locking member 8.

  Next, Embodiment 2 will be described with reference to FIG. In addition, since this embodiment is the same as that of embodiment shown in FIGS. 1-4, in the same part, the same code | symbol is attached | subjected and description is abbreviate | omitted and it mainly demonstrates a different part.

  In the pipe joint of the first embodiment, the third seal portion 92 between the locking member 8 and the inner peripheral end of the through hole 52 is formed by coating the sealing member 82 applied to the outer surface of the locking member 8. However, in the pipe joint of the present embodiment, the third seal portion 92 is formed by the seal member (seal layer 521) at the inner peripheral end of the through hole 52. This is different from Form 2.

  The locking member 8 of the present embodiment is not coated with a sealing member and is composed of a steel ball 81, and the entire surface of the steel ball 81 is exposed.

  The through hole 52 has a lower hole portion 520 formed in the circumferential wall 51 of the main cylinder 5 in the circumferential direction, and an inner peripheral end portion of the lower hole portion 520 over the entire length in the thickness direction of the main cylinder 5. And a coated sealing layer 521. The seal layer 521 is made of a seal member such as synthetic rubber. The inner diameter of the lower hole portion 520 is slightly larger than the outer diameter of the locking member 8, but the inner diameter of the inner end surface of the seal layer 521 is slightly smaller than the outer diameter of the locking member 8. Thereby, the locking member 8 is movable in the radial direction of the main cylinder 5 (in the direction of the central axis of the through hole 52), but keeps the through hole 52 airtightly closed while moving.

  The pipe joint having such a configuration can be secondarily sealed by the second seal portion 91 and the third seal portion 92 even when fluid leaks from the first seal portion 90, as in the first embodiment. It becomes. As a result, the pipe joint of this embodiment can also reliably prevent fluid leakage. At this time, as in the first embodiment, since a seal portion is not necessary between the main cylinder 5 and the outer cylinder 7, an operating force for moving the outer cylinder 7 with respect to the main cylinder 5 is increased. In addition to being small, it is also possible to omit a long seal member extending over the entire outer periphery of the main cylinder 5. In addition, it is possible to reduce the size of the pipe joint in the radial direction, and to reduce the size.

  Further, when the plug 1 is attached to or detached from the socket 4, even if the locking member 8 slides on the groove 11 of the plug 1 or the bulging portion 71 of the outer cylinder 7 or the inner cylinder 6 of the socket 4, Since the sealing member is not provided, there is little influence on the sealing performance.

  As described above, in the pipe joints of the first and second embodiments, the first seal part 90 and the fourth seal part 93 are used as primary seals, but the pipe joint of the present invention is provided with the fourth seal part 93. Instead, the first seal portion 90, the second seal portion 91, and the third seal portion 92 may be hermetically sealed. That is, in the pipe joint of the present invention, the fourth seal portion 93 in the first and second embodiments is not necessarily required, but at least between the plug tip portion and the inner cylindrical body and the through hole of the main cylindrical body. It suffices if the seal portion is formed at three or more locations between the tip side portion and the plug, and between the locking member and the inner peripheral end of the through hole. In this case, the inner periphery of the inner cylinder portion 54 and the main cylinder body are configured such that the peripheral edge on the front end side of the inner cylinder portion 54 of the main cylinder 5 abuts against the seal member 900 provided on the action portion 62 in the plug connection state. It is also possible to seal between the inner peripheral side of 5 (area communicating with the inner cylinder housing portion 56).

  Moreover, the material of the sealing member which comprises each sealing part of the pipe joint of this invention is not limited to the thing of the material illustrated in Embodiment 1,2.

  Moreover, although the locking member 8 of the first and second embodiments is mainly composed of the steel ball 81, the locking member 8 of the present invention may be a rod-shaped member such as a columnar shape or a prismatic shape. The shape is not particularly limited.

  Further, the third seal portion 92 of the first embodiment is configured to coat the entire surface of the steel ball 81 with a seal member 82 such as a synthetic rubber. However, the seal member provided in the locking member of the present invention is as follows. It is not necessary to coat the entire surface of the steel ball, and it is sufficient that a seal member is provided at least in a portion in contact with the inner peripheral surface of the through hole in the locking member. Further, the third seal portion 92 of the second embodiment is configured to coat the entire inner surface (the entire length in the thickness direction and the circumferential direction) of the lower hole portion 520 with a seal member (seal layer 521) such as synthetic rubber. However, the seal member provided at the inner peripheral end of the through hole of the present invention does not need to coat the entire inner surface, and the seal member is provided at least in a portion of the through hole that contacts the inner peripheral surface of the through hole. That's fine.

  Moreover, although the pipe joint of the said Embodiment 1, 2 became the structure by which the on-off valve 15 was provided in the plug 1, this on-off valve 15 may be provided in the socket 4. FIG. Furthermore, even if the on-off valve 15 is not provided on this pipe joint, it is sufficient that an on-off valve is provided on the upstream side of the pipe joint separately from the pipe joint. The on-off valve 15 provided in the pipe joint of Embodiments 1 and 2 is not necessarily a necessary configuration.

  In the pipe joints of the first and second embodiments, the gas tube is provided in each of the plug 1 and the socket 4 and the gas tubes are connected to each other. The plug mounting portion can also be applied to those directly attached to the gas equipment, and the connection target is not limited to the gas tube. Furthermore, the pipe joint of the present invention is naturally applicable not only to a gas such as gas but also a liquid such as water as a fluid flowing through the inside.

DESCRIPTION OF SYMBOLS 1 Plug 11 Groove part 13 Plug front-end | tip part 14 Attachment part 141 Protrusion part 18 Seal member contact part 4 Socket 41 Cover member 5 Main cylinder 51 Peripheral wall 52 Through-hole 53 Attachment part 57 Main cylinder flange 59 Inside opening-and-closing valve pressing piece 6 In Cylindrical body 62 Acting portion 7 Outer cylindrical body 71 Swelling portion 72 First sliding contact surface 73 Second sliding contact surface 74 Locking member pressing surface 8 Locking member 81 Steel ball 82 Seal member 90 First seal portion 91 Second seal Part 92 Third seal part 93 Fourth seal part

Claims (2)

With a plug and socket,
The plug has a groove provided on the outer peripheral surface,
The socket is
A main cylinder body in which the plug is inserted and a through hole is provided in the peripheral wall;
An inner cylinder that is provided on the inner peripheral side of the main cylinder, is movable in the axial direction of the main cylinder, and is biased toward the front end of the main cylinder;
An outer cylinder that is provided on the outer peripheral side of the main cylindrical body, is movable in the axial direction of the main cylindrical body and is urged toward the distal end side of the main cylindrical body, and has a bulging portion formed on the inner peripheral surface;
And having a locking member arranged so as to be movable in the inner and outer directions in the through hole,
When the plug is not connected, the locking member is positioned radially outward from the outer peripheral surface of the inner cylinder, and a part of the locking member protrudes from the outer peripheral surface of the main cylindrical body. The protruding portion is in contact with the bulging portion of the outer cylindrical body, so that the movement of the outer cylindrical body toward the front end side of the main cylindrical body is restricted,
When a plug is inserted into a socket that is not connected to the plug, the inner cylinder pressed against the tip of the plug moves to the side opposite to the tip of the main cylinder, and the locking member biased radially inwardly has a diameter. It moves inward, part of the locking member enters the groove of the plug and the outer cylinder moves to the front end side of the main cylinder, and the part opposite to the part where the locking member enters is the outer cylinder. The contact state between the plug and the socket is locked by abutting against the inner surface of the bulging portion of
A pipe joint in which a seal portion for performing a primary seal is formed between a tip portion of the plug and the inner cylindrical body,
In a state where the plug and the socket are connected, between the inner peripheral surface on the tip side of the main cylinder and the outer peripheral surface of the plug, and between the locking member and the through hole. The seal part which performs a secondary seal in two places between inner peripheral ends is formed ,
The seal portion between the inner peripheral surface on the tip side of the through hole in the main cylinder and the outer peripheral surface of the plug is a seal in a seal member housing portion recessed in the inner peripheral surface of the main cylinder. Composed of members,
The seal member accommodating portion is configured to open toward only the shaft side of the main cylinder at a position located closer to the through hole than the tip of the main cylinder. Pipe fittings. The seal part between the inner peripheral surface on the tip side of the through hole in the main cylinder and the outer peripheral surface of the plug is,
A seal member provided on an inner peripheral surface between the through hole and the tip in the main cylinder;
The pipe joint according to claim 1, wherein the pipe joint is formed with an outer peripheral surface of the plug.

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