WO2012173152A1 - Pipe joint - Google Patents

Abstract

A female member is provided with: a female-side tube body having an insertion opening; a female-side valve body pressed toward the insertion opening; and a female-side pressing section affixed to the female-side tube body and having a pressing front-end section at the front-end thereof. A male member is provided with: a male-side tube body having a male-side pressing section having formed therein a male-side opening through which the female-side pressing section is inserted, the male-side pressing section pressing the female-side valve body; and a male-side valve body pressed toward the male-side opening. The male-side valve body has formed therein a recess for receiving the pressing front-end section when the female member and the male member are in a state in which the female member and the male member are connected to each other. The pressing front-end section is provided with an O-ring which is pressed against and in contact with the recess to seal the gap between the pressing front-end section and the male-side valve body.

Description

Pipe fitting

The present invention relates to a pipe joint that includes a male member and a female member, and is connected to each other by inserting the male member into the female member so that liquid can flow therethrough.

Conventionally, for example, a pipe joint disclosed in Patent Document 1 is known. 4 and 5 are cross-sectional views showing a cross-sectional structure of a male member and a cross-sectional structure of a female member constituting a conventional pipe joint, and FIG. 4 shows that the connection between the male member and the female member is released. FIG. 5 shows a connected state in which the male member and the female member are connected.

As shown in FIG. 4, the male side cylinder 111 of the male member 110 constituting the pipe joint 100 is formed in a substantially cylindrical shape extending in the axial direction A. In this male side cylinder 111, the upper side in the axial direction A is a male side pressing part 111A that is a portion inserted into the female member 120 in a connected state, and the lower side in the axial direction A is attached by the piping member MP. It is the male side base 111B which is a portion to be formed.

Of the inner side surface 112 of the male side cylindrical body 111, a male side valve seat 112A in which the inner diameter of the male side cylindrical body 111 is reduced is formed on the male side pressing portion 111A side. Further, on the male side base portion 111B side of the inner side surface 112 of the male side cylindrical body 111, a female screw portion 112B to which the piping member MP is screwed is formed. Inside the male cylinder 111, a substantially cylindrical spider 113 is fitted between the male valve seat 112A and the female screw part 112B. The spider 113 is restricted from moving to the male base 111B side by a snap ring (not shown).

A cylindrical guide sleeve 113b having a valve body passage 113a extending in the axial direction A protrudes from the center of the spider 113. In addition, a plurality of guide sleeves 113b extending in the axial direction A are provided outside the guide sleeve 113b in the spider 113. The flow path 113c penetrates. In the guide sleeve 113b of the spider 113, the shaft portion 115 of the male valve body 114 having a frame shape is inserted so as to be slidable along the axial direction A. At the upper end of the shaft 115, a truncated cone-shaped valve body tip 116 disposed above the guide sleeve 113b is integrally formed. An annular seal (not shown) that can come into close contact with the male valve seat 112A is attached to the proximal end of the valve body distal end portion 116 on the shaft 115 side. Then, between the valve element front end portion 116 and the spider 113, the valve element front end portion 116 is urged toward the male side valve seat 112A, that is, a male that urges the annular seal toward the male side valve seat 112A. A side spring 117 is sandwiched.

On the other hand, the female side cylinder 121 of the female member 120 constituting the pipe joint 100 has a substantially cylindrical shape that extends in the axial direction A like the male side cylinder 111 and has an inner diameter larger than the outer diameter of the male side cylinder 111. Have. In the female side cylinder 121, the lower side in the axial direction A is an insertion part 121A that is a part into which the male member 110 is inserted in a connected state, and the upper side in the axial direction A is a part to which the piping member MP is attached. It is a female side base 121B.

Of the inner surface 122 of the female cylinder 121, an insertion port 122A into which the male cylinder 111 can be inserted and withdrawn is formed on the insertion part 121A side. In addition, on the female side base 121B side of the inner side surface 122 of the female side cylinder 121, a female screw part 122B to which the pipe member MP is screwed is formed. Inside the female cylinder 121, a support portion 123, which is a reduced diameter portion, is formed between the insertion port 122A and the female screw portion 122B.

A cylindrical female valve seat 124 extending along the axial direction A is fixed to the center of the support portion 123, and a plurality of extending in the axial direction A is provided outside the female valve seat 124 in the support portion 123. The flow path 123c penetrates. Of the two ends of the female valve seat 124 in the axial direction, an inverted hook-shaped receiving portion 125 into which the valve body tip portion 116 can be fitted is formed at the end on the insertion port 122A side. In addition, a cylindrical female valve body 126 that surrounds the receiving portion 125 over its entire circumference is fitted into the female side cylinder 121 so as to be slidable with respect to the inner peripheral surface of the female side cylinder 121. Yes. An annular seal 125 a having an inner diameter smaller than the outer diameter of the receiving portion 125 is fitted on the insertion portion 121 A side of the inner peripheral surface of the female valve body 126. Between the female valve body 126 and the support portion 123, the female valve body 126 is urged toward the insertion port 122A, that is, the annular seal 125a of the female valve body 126 is received by the female valve seat 124. A spring 127 that is biased toward the portion 125 is sandwiched.

When the male member 110 is inserted into the insertion port 122 </ b> A of the female member 120, first, the end surface of the male-side pressing portion 111 </ b> A and the end surface of the female-side valve body 126 come into contact with each other, and the receiving portion 125 of the female-side valve seat 124. The valve element front end portion 116 of the male valve element 114 abuts against the valve. When the male member 110 is further inserted into the female member 120 from this state, the female valve body 126 is subjected to the female screw of the female cylinder 121 by the force received from the end surface of the male pressing portion 111A as shown in FIG. It moves to the part 122B side. Further, the male side valve element 114 moves to the female threaded part 112 </ b> B side of the male side cylindrical body 111 by the force received from the receiving part 125 of the female side valve seat 124. As a result, a passage is formed between the male valve body 114 and the male valve seat 112A in the male member 110, and between the female valve body 126 and the female valve seat 124 in the female member 120. A passage is formed between them. As a result, the liquid can flow between the male member 110 and the female member 120 through these passages. The male member 110 and the female member 120 are provided with seal members at various places so that liquid does not leak to the outside.

Japanese National Patent Publication No. 11-501715

By the way, in the pipe joint 100 having the above-described configuration, when the male member 110 and the female member 120 are connected, the valve body tip portion 116 of the male valve body 114 is fitted into the receiving portion 125 of the female valve seat 124. It is. At this time, since a slight gap is formed between the valve element front end portion 116 and the receiving portion 125, the liquid circulating around these enters the gap. As a result, when the connection between the male member 110 and the female member 120 is released, the surface of the valve body tip portion 116 to which the liquid adheres and the surface of the receiving portion 125 to which the liquid adheres are exposed to the atmosphere. It becomes.

The foreign matter floating in the air is more likely to adhere to the portion where the liquid is attached than the portion where the liquid is not attached, and the attached foreign matter remains as a residue even after the liquid is dried. Therefore, if the male member 110 and the female member 120 are connected again with the foreign matter attached, not only the attached foreign matter is mixed into the liquid, but also the gap is enlarged so that the liquid can easily enter the gap. End up.

This invention is made | formed in view of the said actual condition, The objective suppresses that a liquid adheres to the surface of a male member, and the surface of a female member in the pipe joint comprised by a male member and a female member. An object of the present invention is to provide a pipe joint that can be used.

The present invention provides a male member having a male valve body biased toward the male side opening in a male side cylindrical body having a male side opening which is a narrowed cylindrical opening at the male side cylinder end; A female cylinder having an insertion part into which the male cylinder can be inserted, and a columnar shape extending in the axial direction of the female cylinder, arranged in the female cylinder, and an end opposite to the insertion part A female-side pressing portion fixed to the female-side cylindrical body and a female-side opening that is a cylindrical opening into which the female-side pressing portion is inserted, and the female-side cylindrical body and the female-side pressing portion A female member having a female valve body biased toward the insertion part in a cylindrical shape that closes the annular gap between the insertion part, and the male side cylinder includes the female member In a state where it is inserted into the insertion portion, the female side pressing portion pushes the male valve body into the male side cylinder through the male side opening, and the male side cylinder end is the difference. In the pipe joint that communicates with each other through the male side opening and the female side opening by pushing the female side valve body into the female side cylinder through the groove part, at least the female side pressing part and the male side valve body For one, the female-side pressing portion and the male-side valve are pressed against the female-side pressing portion and the male-side valve body in a state where the female-side pressing portion presses the male-side valve body. Provided is a pipe joint provided with an annular first sealing member for sealing a gap with a body.

According to the pipe joint of the present invention, when the flow path of the male member and the flow path of the female member are in communication with each other, the gap between the female side pressing portion and the male side valve body is sealed by the seal member. For this reason, it is possible to suppress the flowing liquid from entering the gap. Therefore, it is possible to prevent the liquid from adhering to the surface of the female-side pressing portion and the surface of the male-side valve body when the connection between the female member and the male member is released.

In the pipe joint according to the present invention, either the tip of the female-side pressing portion or the tip of the male-side valve body is in a state where the female-side pressing portion presses the male-side valve body, It is preferable that a recess to be fitted is formed.

According to the pipe joint according to this preferred embodiment, since either the tip of the female-side pressing portion or the tip of the male-side valve body is fitted into the recess formed on the other side, the female-side pressing portion holds the male-side valve body. In the pressing state, it is possible to improve the consistency of the position between the tip of the female side pressing portion and the tip of the male valve body.

The pipe joint according to the present invention is a pipe in which the female side pressing portion is closed at the insertion portion side and extends in the axial direction of the female side cylindrical body, and the flow path of the female member is formed therein, In the state where the male cylinder is inserted into the female cylinder, and has a communication passage which is a lateral hole disposed in the male cylinder, on the inner surface of the male cylinder end. Is a state in which the male cylinder is inserted into the female cylinder, and an outer surface of the female pressing portion inserted into the male cylinder end and an inner surface of the male cylinder end. It is preferable that an annular second seal member that seals a gap between the male cylinder end and the female valve body is provided.

According to the pipe joint according to this preferred embodiment, when the male member and the female member are in the connected state, the gap between the male side cylinder end and the female side valve element is sealed by the second seal member. Therefore, it can suppress that the liquid which distribute | circulates between a male member and a female member enters into the clearance gap between a male side cylinder end and the female side valve body pressed by it. Therefore, when the connection between the female member and the male member is released, in addition to the surface of the female-side pressing portion and the surface of the male-side valve body, liquid is added to the surface of the male-side cylinder end and the surface of the female-side valve body. It can suppress adhering.

In the pipe joint according to the present invention, the second seal member is formed on an outer surface of the male valve body and an inner surface of the male cylinder end in a state where the male valve body closes the male opening. Preferably, the inside of the male cylinder is sealed against the outside of the male cylinder.

When the male member and the female member are in an unconnected state, the male member is required to have a function of preventing the liquid in the male cylinder from leaking outside. According to the pipe joint according to this preferred embodiment, in such a non-connected state, the second seal member is in pressure contact with the outer surface of the male valve body and the inner surface of the male opening. As a result, in the non-connected state, it is possible to suppress the liquid staying in the male cylinder from leaking to the outside with the above-described second seal member. That is, the second seal member that suppresses the liquid from adhering to the surface of the male cylinder end and the surface of the female valve body in the connected state expresses the function of suppressing leakage required for the male member in the disconnected state. Also become. Therefore, in suppressing the adhesion of the liquid to the surface of the female valve body and the surface of the male pressing portion, it is possible to suppress an increase in the number of parts constituting the male member.

In the present invention, the male member slidably guides the male valve body, and the male valve body is pushed into the male cylinder by the tip of the female pressing portion. The male side valve body also has a cylindrical guide portion into which the tip of the female side pressing portion is pushed, and an annular third seal member is attached to the inner surface of the guide portion, and the third seal member Is in a position straddling the outer surface of the male valve body and the outer surface of the female pressing portion in a state where the male valve body is pushed into the male cylindrical body by the tip of the female pressing portion. Disposed and pressed against the outer surface of the male valve body and the outer surface of the female pressing portion and the inner surface of the guide portion, and a gap between the male valve body and the tip of the female pressing portion is formed. It is preferable to seal.

According to the pipe joint according to this preferred aspect, when the female member and the male member are in the connected state, the gap between the male valve body and the distal end of the female pressing portion is sealed by the third seal member attached to the guide portion. Is done. As a result, it is possible to suppress the flowing liquid from entering the gap between the male valve body and the tip of the female pressing portion at each outer surface. Therefore, it is possible to further suppress the liquid from adhering to the female side pressing portion and the male side valve body when the connection between the female member and the male member is released.

It is sectional drawing which shows the cross-sectional structure of the male member and female member which comprise the pipe joint which concerns on one embodiment of this invention, Comprising: It is a figure which shows the cross-sectional structure of the male member and female member in a non-connecting state, It is a sectional view showing a sectional structure of a male member and a female member at the start of connection, It is a sectional view showing a sectional structure of a male member and a female member in a connected state, It is a sectional view showing a sectional structure of a male member and a female member constituting a pipe joint in a conventional example, and is a diagram showing a sectional structure in an unconnected state, It is sectional drawing which showed the cross-section of the male member and female member which comprise the pipe joint in a prior art example, Comprising: It is the figure which showed the cross-section in a connection state.

Hereinafter, an embodiment of a pipe joint according to the present invention will be described with reference to FIGS. First, the female member which comprises a pipe joint is demonstrated with reference to FIG.
(Female member)
As shown in FIG. 1, the female member 10 constituting the pipe joint 1 has a female cylinder 11 that extends in the axial direction A in a multistage cylindrical shape with both ends open. At the lower end, which is one end of the female cylinder 11, a male member 40 is inserted, and an insertion port 12 a that is a female-side opening that is widened outward to facilitate insertion of the male member 40 is formed. ing. On the other hand, a valve pusher 13 is fixed to a sealing port 12b that is the other cylinder end of the female cylinder 11 via a gasket (not shown).

The valve pressing body 13 has an annular flange 14 connected to the upper end of the female side cylinder 11 so as to cover the upper end of the female side cylinder 11. A cylindrical female-side pressing portion 15 that extends toward the insertion port 12a along the axial direction A is formed integrally with the flange 14 at the center of the flange 14, and a cylinder that extends upward along the axis A. A shaped female connection 16 is also formed integrally with the collar 14. The female side connecting portion 16 is a portion that is connected to an external pipe, and the female side pressing portion 15 and the female side connecting portion 16 form a single flow path 17 that is continuous in the vertical direction. .

A pressing tip 18 having a multi-stage covered cylindrical shape extending in the axial direction A is formed at the tip of the female pressing portion 15. In the middle of the axial direction A on the outer peripheral surface of the pressing tip portion 18, a groove extending over the entire circumference of the pressing tip portion 18 is formed, and an O-ring 19 as a first seal member is mounted in the groove. Further, a stepped portion 20 based on the difference between the outer diameter of the female-side pressing portion 15 and the outer diameter of the pressing tip portion 18 is formed on the female-side pressing portion 15 above the O-ring 19. Further, a communication path 21 that communicates the flow path 17 of the female member 10 and the outside of the female-side pressing portion 15 passes through a portion of the peripheral wall of the female-side pressing portion 15 near the pressing tip portion 18.

A female valve body 25 having a cylindrical shape concentric with the female cylinder 11 is inserted in the female cylinder 11. Further, the above-described female pressing portion 15 is inserted into the cylinder of the female valve body 25.

Of the outer peripheral surface of the female side valve body 25, an outer seal groove 26 that is a protruding groove extending in the entire circumferential direction of the female side valve body 25 is formed in a portion on the sealing port 12 b side of the female side cylindrical body 11. Yes. The outer seal groove 26 has substantially the same outer diameter as the inner diameter of the female cylinder 11. In addition, on the inner peripheral surface of the female side valve body 25, the inner seal groove 27, which is also a protruding groove extending in the entire circumferential direction of the female side valve body 25, is provided on the sealing port 12 b side of the female side cylindrical body 11. Is formed. Furthermore, of the inner peripheral surface of the female side valve body 25, the inner seal groove 28, which is also a protruding groove extending in the entire circumferential direction of the female side valve body 25, is located on the insertion port 12 a side of the female side cylinder body 11. Is formed. The pair of upper and lower inner seal grooves 27, 28 have the same inner diameter as the outer diameter of the female side pressing portion 15, and the inner seal groove 28 forms a female side opening 29 by the inner surface thereof. The female valve body 25 is displaced in the axial direction A while increasing or decreasing the volume of the space 30 defined by the valve pressing body 13 and the female valve body 25 in the space in the female cylinder 11.

In the groove of the outer seal groove 26, an annular seal member 31 that is in pressure contact with the inner side surface 11a of the female side cylinder 11 is mounted. In addition, annular seal members 32 and 33 that are in pressure contact with the outer surface of the female pressing portion 15 are mounted in the inner seal grooves 27 and 28, respectively. Seal members 31 and 32 mounted in the outer seal groove 26 and the inner seal groove 27 of the female valve body 25 are in pressure contact with the inner surface 11a of the female cylinder 11 and the outer surface 15a of the female pressing portion 15, respectively. The space 30 is sealed. Further, the seal member 33 mounted in the inner seal groove 28 is in pressure contact with the outer surface 15 a of the female side pressing portion 15.

When the communication path 21 described above is between the inner seal groove 27 and the inner seal groove 28 in the axial direction A, the liquid contained in the flow path 17 is transferred to the female side by the sealing function of the seal member 33 described above. There is no leakage from the inside of the valve body 25. On the other hand, when the communication path 21 is below the inner seal groove 28 in the axial direction A, the liquid stored in the flow path 17 flows outside the female valve body 25 via the communication path 21. It becomes.

A coil spring 35 having one end supported by the flange 14 of the valve pressing body 13 is accommodated in a space 30 sandwiched between the valve pressing body 13 and the female side valve body 25 in the female side cylindrical body 11. ing. The coil spring 35 urges the female valve body 25 along the axial direction A toward the insertion port 12a. Further, a locking portion 36 protrudes from the inner peripheral surface of the female side cylindrical body 11 substantially at the center in the axial direction A over the entire circumferential direction of the female side cylindrical body 11. The engaging portion 36 is engaged with the outer seal groove 26 of the female side valve body 25, thereby restricting the displacement of the female side valve body 25 toward the insertion port 12a. In the state where the female valve body 25 is locked by the locking portion 36, the pressing tip 18 of the female pressing portion 15 from the pressed surface 25a that is the end surface of the female valve body 25 on the insertion port 12a side. The locking portion 36 is formed so as to protrude.

In this embodiment, in the female side cylinder 11, the part from the insertion port 12a to this latching | locking part 36 corresponds to an insertion part. Of the positions that the female side valve body 25 can take, the position at which the outer seal groove 26 of the female side valve body 25 engages with the locking portion 36 is referred to as a valve closing position. Of the positions that the female valve body 25 can take, the position where the pressed surface 25a of the female valve body 25 is disposed closer to the sealing port 12b than the communication path 21 is referred to as a valve opening position.

(Male member)
The male member 40 has a male cylinder 41 extending along the axial direction A in a substantially cylindrical shape with both ends opened. The male side cylinder 41 is formed such that its outer side surface 41a is slidable on the inner side surface 11a of the female side cylinder 11, and a flow path 42 is formed therein. Further, the male side cylinder 41 has a male side connection part 43 which is formed in a cylindrical shape having a smaller diameter than the male side cylinder 41 and is connected to an external pipe (not shown), and the male side cylinder 41. And a reduced diameter portion 44 that connects the male connection portion 43 to each other.

An annular male side pressing portion 46 having a narrowed cylindrical opening is integrally formed at one cylindrical end of the male side cylindrical body 41. A pressing surface 46 a that is similar to the pressed surface 25 a of the female valve body 25 is formed on the upper end surface of the male pressing portion 46. When the male member 40 is inserted into the female member 10, the pressing surface 46 a that is the end surface of the male pressing portion 46 presses the pressed surface 25 a of the female valve body 25. Furthermore, when the pressing surface 46 a engages with the locking portion 36 of the female side cylinder 11, insertion of the male member 40 into the female member 10 is restricted.

The male side pressing portion 46 has a male side opening 47 that has substantially the same inner diameter as the outer side diameter of the female side pressing portion 15 and is narrowed with respect to the inner diameter of the male side cylindrical body 41 along the axial direction A. Yes. Further, the outer side surface 41a on the male side pressing portion 46 side is formed with an annular groove that extends in the entire circumferential direction of the outer side surface 41a, and the inner side surface of the male side opening 47 also has a circumferential direction of the inner side surface. An annular groove is formed throughout. An annular outer seal member 48 and an annular inner seal member 49, which is a second seal member, are mounted on the two grooves formed in the male side pressing portion 46, respectively.

A support portion 51 extending along the axial direction A is connected to the inner peripheral surface of the reduced diameter portion 44 inside the male side cylinder 41, and a bottomed tube extending in the axial direction A at the upper end of the support portion 51. Shaped case bodies 52 are connected. An annular guide portion 55 having a narrowed opening is formed at the distal end portion of the case body 52. An annular convex groove extending in the entire circumferential direction of the guide portion 55 is formed on the inner side surface of the guide portion 55, and an annular shape that is a third seal member having a U-shaped cross section is formed inside the convex groove. A seal member 63 is attached. Inside the seal member 63, a male valve body 53 having a closed cylindrical shape having an outer diameter substantially the same as the inner diameter of the guide portion 55 and extending along the axial direction A is slid along the axial direction A. It is movably interpolated.

The top surface 53b of the male valve body 53 is provided with a recess 60 into which the pressing tip 18 of the female pressing portion 15 can be fitted. The inner diameter of the recess 60 is slightly larger than the outer diameter of the pressing tip 18, and the pressing tip 18 is slidable in the axial direction A by the recess 60. The depth of the recess 60 is substantially equal to the length of the pressing tip 18 in the axial direction A, and the bottom surface 60 a of the recess 60 and the pressing surface of the pressing tip 18 in a state where the pressing tip 18 is accommodated in the recess 60. 18a is in contact, and the top surface 53b of the male valve body 53 and the stepped portion 20 of the female pressing portion 15 are in contact with each other.

At the lower end of the outer side surface 53a of the male side valve element 53, a locking piece 57 is formed that protrudes radially outward over the entire circumferential direction of the male side valve element 53. A coil spring 56 supported by the case body 52 is accommodated between the bottom of the case body 52 and the bottom of the recess 60 in the case body 52. The biasing force of the coil spring 56 is set so that the top surface 53b of the male valve body 53 and the pressing surface 46a of the male pressing portion 46 are flush with each other in a state where the coil spring 56 is in a natural length. Yes. The male valve body 53 is displaced in the axial direction A while increasing or decreasing the volume of the space 65 defined by the male valve body 53 and the case body 52 in the space in the male cylinder body 41. Note that the displacement of the male valve body 53 toward the male opening 47 due to the sudden urging of the coil spring 56 is restricted by the locking piece 57 of the male valve body 53 coming into contact with the guide portion 55.

In the present embodiment, among the positions that the male valve body 53 can take, the position of the male valve body 53 in which the coil spring 56 has a natural length is referred to as a valve closing position. On the other hand, among the positions that the male valve body 53 can take, the top surface 53b of the male valve body 53 is located inside the male cylinder 41, and the top surface 53b of the male valve body 53 is guided. A position in the convex groove of the portion 55 is referred to as a valve opening position.

It should be noted that the inner seal member 49 attached to the male side pressing portion 46 is in pressure contact with the outer side surface 53a of the male side valve element 53 disposed at the valve closing position. As a result, in a state where the male valve body 53 is disposed at the valve closing position, foreign matter is mixed into the flow path 42 from the gap between the male side pressing portion 46 and the male valve body 53, and stays in the flow path 42. It is possible to suppress the leaked liquid from leaking out of the gap.

(Function)
Next, of the operations of the pipe joint 1 having the above-described configuration, the operation when the male member 40 is inserted into the female member 10 will be described with reference to FIGS.

First, as shown in FIG. 2, the insertion port 12 a of the female member 10 and the male side pressing portion 46 of the male member 40 are arranged so as to face each other in the axial direction A. When the male member 40 is inserted into the female member 10 through the insertion port 12a, the male side cylinder 41 of the male side cylinder 41 slides on the inner side surface 11a of the female side cylinder 11, and the male side pressing portion 46 The pressing surface 46a and the pressed surface 25a of the female valve body 25 abut. Further, the pressing tip 18 of the female-side pressing portion 15 is accommodated in the recess 60 of the male valve body 53, and the pressing surface 18a of the pressing tip 18 and the bottom surface 60a of the recess 60 come into contact with each other. 15 step portions 20 and the side wall 61 of the recess 60 abut. At this time, the O-ring 19 attached to the pressing tip 18 is pressed against the pressing tip 18 and the side wall 61 of the recess 60 to seal the gap between the pressing surface 18 a of the pressing tip 18 and the bottom surface 60 a of the recess 60. To do.

When the male member 40 is further inserted from this state, the male-side pressing portion 46 presses the female-side valve body 25 against the biasing force of the coil spring 35, and the female-side pressing portion 15 is pushed in the female-side opening 29. While sliding, the female valve body 25 in the valve closing position is displaced toward the sealing port 12b side of the female cylinder 11. The female-side pressing portion 15 presses the male-side valve body 53 against the biasing force of the coil spring 56, and slides the female-side pressing portion 15 in the male-side opening 47 formed in the male-side pressing portion 46. The male valve body 53 in the valve closing position is displaced toward the bottom of the case body 52 while being moved and while sliding the male valve body 53 on the guide portion 55.

As shown in FIG. 3, when the male member 40 is inserted to a position where the male side pressing portion 46 and the engaging portion 36 protruding from the inner side surface 11 a of the female side cylinder 11 are engaged, The side valve body 25 and the male side valve body 53 are both arranged at the valve opening position, and the female member 10 and the male member 40 are connected. At this time, the communication passage 21 formed in the female-side pressing portion 15 is disposed inside the male-side cylinder 41 through the female-side opening 29 and the male-side opening 47. Thereby, the flow path 17 of the female member 10 communicates with the flow path 42 of the male member 40 through the communication path 21, and the liquid can be circulated as indicated by an arrow in FIG. 3, for example.

When the female member 10 and the male member 40 are in a connected state, the seal member 63 attached to the guide portion is disposed so as to straddle the side wall 61 of the recess 60 and the step portion 20 of the female-side pressing portion 15. Then, the gap between the side wall 61 of the concave portion 60 and the stepped portion 20 of the female side pressing portion 15 is sealed by being pressed against them. That is, the flowing liquid can be prevented from entering the gap between the side wall 61 of the recessed portion 60 and the stepped portion 20 of the female-side pressing portion 15 and entering the inside of the case body 52. Further, it is possible to prevent liquid from entering the gap between the pressing surface 18 a of the pressing tip 18 and the bottom surface 60 a of the recess 60.

Further, the inner seal member 49 attached to the male side opening 47 of the male side pressing portion 46 is in pressure contact with the female side pressing portion 15 and the pressed surface 25a of the female side valve body 25 and the pressing surface of the male side pressing portion 46. Seal between 46a. Thereby, the flowing liquid can be prevented from entering the gap between the pressed surface 25a of the female valve body 25 and the pressing surface 46a of the male pressing portion 46.

Further, the outer seal member 48 mounted on the outer side of the male-side pressing portion 46 is in pressure contact with the inner surface 11a of the female-side cylinder 11 during the period in which the male member 40 is inserted into the female member 10, so The space between the pressing surface 46 a of the pressing portion 46 and the outer surface 41 a of the male side cylinder 41 is sealed. As a result, even if the liquid enters the gap between the pressed surface 25a of the female valve body 25 and the pressing surface 46a of the male pressing portion 46, the liquid is the female cylindrical body 11 and the male cylindrical body 41. Leakage to the outside through the gap with the male cylinder 41 can be suppressed.

On the other hand, when the connection between the female member 10 and the male member 40 is released, the male member 40 is pulled out of the female member 10. At this time, the female side valve body 25 is displaced to the closed position by sliding the inner side surface 11 a of the female side cylindrical body 11 and the outer side surface 15 a of the female side pressing portion 15 by the biasing force of the coil spring 35. Further, the male valve body 53 is displaced by the urging force of the coil spring 56 while sliding the male opening 47 of the male pressing portion 46 while the pressing tip portion 18 is accommodated in the recess 60 to the valve closing position. . Here, when the male side valve body 53 is displaced to the valve closing position, the female side pressing portion 15 of the valve pressing body 13 slides in the male side opening 47 of the male side pressing portion 46, so that the female side pressing portion 15. The communication passage 21 formed in the passage passes through a contact portion between the pressed surface 25a of the female valve body 25 and the pressing surface 46a of the male pressing portion 46. However, the transit time is very short. Therefore, even if liquid enters the gap between the pressed surface 25a of the female side valve element 25 and the pressing surface 46a of the male side pressing portion 46 through the communication passage 21, the amount of the inner seal member 49 is provided. Compared to the case where the male member 40 and the female member 10 which are not configured are in a connected state, the amount is very small.

As described above, according to the pipe joint 1 according to the present embodiment, the effects listed below can be obtained.
(1) The male side valve body 53 is provided with a recess 60 for accommodating the pressing tip 18 that presses the male side valve body 53. In addition, an O-ring 19 that presses against the side wall 61 of the recess 60 by being accommodated in the recess 60 is attached to the pressing tip 18. According to such a configuration, when the female member 10 and the male member 40 are in a connected state, the flowing liquid is prevented from entering the gap between the pressing surface 18 a of the pressing tip 18 and the bottom surface 60 a of the recess 60. Can do. Therefore, when the connection between the female member 10 and the male member 40 is released, it is possible to suppress the liquid from adhering to the pressing surface 18a of the pressing tip 18 and the bottom surface 60a of the recess 60.

(2) When the pressing tip 18 is accommodated in the recess 60, the gap between the pressing surface 18 a of the pressing tip 18 and the bottom surface 60 a of the recess 60 is sealed by the O-ring 19. According to such a configuration, the position of the side wall 61 of the recess 60 and the position of the O-ring 19 are aligned by fitting the pressing tip 18 into the recess 60. Therefore, in the initial movement when the female member 10 and the male member 40 are connected, the alignment between the side wall 61 and the O-ring 19 is indirectly performed. As a result, since it is not necessary to separately align the side wall 61 and the O-ring 19, the male member 40 can be easily inserted and removed.

(3) The female side pressing portion 15 of the valve pressing body 13 is formed to be slidable within the male side opening 47. In addition, an inner seal member 49 that is in pressure contact with the outer surface 15 a of the female-side pressing portion 15 is attached to the male-side opening 47. According to such a configuration, when the female member 10 and the male member 40 are in the connected state, the flowing liquid is a gap between the pressed surface 25a of the female valve body 25 and the pressing surface 46a of the male pressing portion 46. It is possible to suppress the liquid from entering. Therefore, when the connection between the female member 10 and the male member 40 is released, it is possible to prevent liquid from adhering to the pressed surface 25a of the female side valve body 25 and the pressing surface 46a of the male side pressing portion 46. be able to.

(4) Since the outer diameter of the male side valve body 53 is substantially equal to the outer diameter of the female side pressing portion 15, the inner seal member 49 is connected to the male side valve body 53 when the male side valve body 53 is in the closed position. When the male valve body 53 is in the valve open position, it is pressed against the female pressing portion 15 of the valve pressing body 13.

According to such a configuration, when the female member 10 and the male member 40 are in the non-connected state, foreign matters are mixed into the flow path 42 from the gap between the male side pressing portion 46 and the male side valve body 53, and the male member 40. The liquid filled in the flow path 42 can be prevented from leaking out from the gap. That is, since the inner seal member 49 functions differently when the female member 10 and the male member 40 are in the connected state and when they are in the non-connected state, the male side pressing portion 46 and the female side valve body 25 are connected to each other. In suppressing the adhesion of the liquid, it is possible to suppress an increase in the number of members constituting the male member 40.

(5) When the female member 10 and the male member 40 are in a connected state, the guide member 55 is mounted with a seal member 63 that straddles the side wall 61 of the recess 60 and the stepped portion 20 of the female-side pressing portion 15. Yes. According to such a configuration, when the female member 10 and the male member 40 are in a connected state, the flowing liquid is prevented from entering the gap between the side wall 61 of the recess 60 and the stepped portion 20 of the female-side pressing portion 15. be able to. Therefore, when the connection between the female member 10 and the male member 40 is released, it is possible to prevent liquid from adhering to the stepped portion 20 of the female-side pressing portion 15 and the top surface 53b of the male-side valve body 53. it can.

(6) Moreover, it can further suppress that a liquid enters into the clearance gap between the press surface 18a of the press front-end | tip part 18, and the bottom face 60a of the recessed part 60. FIG.
(7) Further, when the female member 10 and the male member 40 are not connected, the seal member 63 is in pressure contact with the outer surface 53a of the male side valve element 53. Thereby, the liquid in the flow path 42 of the male member 40 can be prevented from entering the space 65 formed in the case body 52. The space 65 is a space whose volume increases or decreases when the male valve body 53 is displaced, and is filled with air when the assembly of the male member 40 is completed. That is, when the liquid is prevented from entering the space 65 by the seal member 63, the male valve body 53 is displaced while increasing or decreasing the volume of the space 65 filled mainly with compressible air. Become. As a result, when connecting the female member 10 and the male member 40, or when releasing the connection between the female member 10 and the male member 40, as compared with the case where the space 65 is filled with the incompressible liquid. The required force can be reduced.

(8) The female side valve body 25 is displaced while increasing or decreasing the volume of the space 30 defined by the female side cylindrical body 11, the valve pressing body 13, and the female side valve body 25 and sealed by the seal members 31 and 32. . According to such a configuration, when the female member 10 and the male member 40 are connected when the liquid enters the space 30 or the connection between the female member 10 and the male member 40 is released, as in (7) above. It is possible to reduce the force required for the operation.

In addition, the said embodiment can also be implemented with the following aspects.
The seal member 63 may be omitted. Even with such a configuration, it is possible to obtain effects equivalent to the effects described in the above (1) to (3).

Since the outer diameter of the male valve body 53 is formed to be equal to the outer diameter of the female pressing portion 15, when the female member 10 and the male member 40 are in a connected state, the inner seal member 49 is on the female side. The outer surface 15a of the pressing part 15 is pressed against. Further, when the female member 10 and the male member 40 are in a non-connected state, the inner seal member 49 presses against the outer surface 53 a of the male valve body 53.

However, the outer diameter of the male side valve element 53 is larger than the outer diameter of the female side pressing part 15 as in the configuration in which the pressing tip 18 is omitted and the female side pressing part 15 presses the male side valve element 53. A large configuration may be used. At this time, the male-side pressing portion 46 is formed with a multi-stage male opening having a reduced diameter on the pressing surface 46a side, and the valve pressing body 13 is formed on the small-diameter portion of the multi-stage male-side opening. A seal member that is in pressure contact with the female side pressing portion 15 is attached, and a seal member that is in pressure contact with the male valve body 53 is attached to the large-diameter portion of the male side opening.

With such a configuration, in a non-connected state, foreign matter is mixed into the flow path 42 from the gap between the male side pressing portion 46 and the male valve body 53, and the liquid filled in the flow path 42 of the male member 40 is in the gap. The effect equivalent to the effect described in the above (1) and (2) can be obtained after suppressing leakage from the outside.

The male side opening 47 has such a size that the female side pressing part 15 and the pressing tip part 18 can be inserted irrespective of the difference between the outer diameter of the female side pressing part 15 and the outer diameter of the pressing tip part 18. It only has to be. At this time, if the female-side pressing portion 15 does not slide in the male-side opening 47, the gap between the pressed surface 25a of the female-side valve body 25 and the pressing surface 46a of the male-side pressing portion 46 can be sealed. Although difficult, an effect equivalent to the effect described in the above (1) can be obtained.

The flow path 17 of the female member 10 only needs to communicate with the female-side connecting portion 16, and is not limited to the inside of the valve pressing body 13, and may be formed around the valve pressing body 13 as in the conventional example. Even if it is such a structure, the effect according to the effect described in said (1) can be acquired.

A concave portion having an inner diameter substantially equal to the outer diameter of the male valve body 53 is formed in the pressing tip portion 18, and when the male member 40 is inserted into the female member 10, the male valve is placed in the concave portion of the pressing tip portion 18. The structure in which the body 53 is engage | inserted may be sufficient. Under the present circumstances, the outer diameter of the press front-end | tip part 18 may be the same as the outer diameter of the female side press part 15, and a mutually different magnitude | size may be sufficient as it. Even if it is such a structure, the effect according to the effect described in said (1) can be acquired.

The position where the O-ring 19 is mounted may be the recess 60 of the male valve body 53 as long as the gap between the pressing surface 18a of the pressing tip 18 and the bottom surface 60a of the recess 60 is sealed.
In the female valve body 25, at least one of the seal member 31 mounted in the outer seal groove 26 and the seal member 32 mounted in the inner seal groove 27 may be omitted. Even with such a configuration, it is possible to obtain effects equivalent to the effects described in the above (1) to (4).

The bottomed cylindrical case body 52 is fixed to the male cylindrical body 41 by the support portion 51, supports one end of the coil spring 56 at the bottom portion, and has a guide portion 55 formed at the tip portion thereof. Yes. For example, the case body 52 is formed by fixing the support portion that supports one end of the coil spring 56 with the support portion 51 and connecting the guide portion 55 to the connection member fixed to the male cylinder 41. The configuration may be omitted.
It should be noted that the entire content of the specification, claims, drawings and abstract of Japanese Patent Application No. 2011-133386 filed on June 15, 2011 is cited herein as the disclosure of the specification of the present invention. Incorporate.

Claims (5)

A male member having a male valve body biased toward the male side opening in the male side cylinder body having a male side opening which is a narrowed cylindrical opening at the male side cylinder end;
A female cylinder having an insertion part into which the male cylinder can be inserted, and a columnar shape extending in the axial direction of the female cylinder, arranged in the female cylinder, on the opposite side of the insertion part A female side pressing portion fixed to the female side cylindrical body at an end; a female side opening that is a cylindrical opening into which the female side pressing portion is inserted; and the female side cylindrical body and the female side pressing portion. A female member having a female valve body that is urged toward the insertion portion in a cylindrical shape that closes the annular gap between the insertion portion,
With
With the male cylinder inserted into the insertion part, the female pressing part pushes the male valve element into the male cylinder through the male opening, and the male cylinder end is the insertion. In a pipe joint that communicates with each other through the male side opening and the female side opening by pushing the female side valve body into the female side cylinder through the part,
At least one of the female-side pressing portion and the male-side valve body is pressed against the female-side pressing portion and the male-side valve body in a state where the female-side pressing portion presses the male-side valve body. An annular first seal member for sealing a gap between the female side pressing portion and the male side valve body is provided. One of the tip of the female-side pressing portion and the tip of the male-side valve body is formed with a recess that fits with the other while the female-side pressing portion presses the male-side valve body. The pipe joint according to claim 1. The female side pressing part is
The insertion portion side is closed and extends in the axial direction of the female cylinder, and the flow path of the female member is formed inside. The pipe penetrates the peripheral wall of the pipe and the male cylinder is connected to the male cylinder. In a state where the side cylinder is inserted, it has a communication path that is a horizontal hole arranged in the male side cylinder,
On the inner surface of the male cylinder end,
In a state where the male cylinder is inserted into the female cylinder, the outer surface of the female pressing portion inserted through the male cylinder end and the inner surface of the male cylinder end are pressed against each other. The pipe joint according to claim 1, further comprising an annular second seal member that seals a gap between the male cylinder end and the female valve element. The second seal member is
In a state where the male valve body closes the male opening, the male valve body is pressed against the outer surface of the male valve body and the inner surface of the male tube end so that the inside of the male cylinder body is in contact with the male valve body. The pipe joint according to claim 3 which seals with respect to the exterior of a side cylinder. The male member is
The male valve body is slidably guided, and in the state where the male valve body is pushed into the male cylinder body by the tip of the female side pressing portion, the male side valve body and the female side pressure body are also pressed. Having a cylindrical guide part into which the tip of the part is pushed,
On the inner surface of the guide part,
An annular third seal member is attached;
The third seal member is
In a state where the male valve body is pushed into the male cylinder by the tip of the female side pressing portion, the male side valve body is disposed at a position straddling the outer surface of the male side valve body and the outer surface of the female side pressing portion. The outer side surface of the male side valve body, the outer side surface of the female side pressing portion, and the inner side surface of the guide portion are pressed against each other to seal a gap between the male side valve body and the tip of the female side pressing portion. The pipe joint according to claim 4.

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