JP4613120B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint, and more particularly, to a pipe joint including a valve that is opened when connected.

  In a pipe joint having male and female joint members that are fitted and connected to each other, the joint member is provided with a valve member, and in a non-connected state, the fluid passage of the joint member is closed and connected. Further, there is known a structure in which the valve bodies of male and female joint members are pressed against each other and retreated to open the fluid passage.

  In this case, the tubular joint body has a valve seat on the front end side connected to the counterpart joint member, and the valve body is urged forward by a spring so that the valve head is engaged with the valve seat. The valve stem extending rearward from the valve head is supported in a fluid passage so as to be displaceable in the front-rear direction by a valve holding member engaged and set on the inner peripheral surface of the joint body. The valve engaging member has a hub portion that is provided in the transverse direction of the fluid passage and has an opening through which the valve stem passes, and a plurality of support leg portions that are provided at intervals around the hub portion and extend rearward. The rear end of the support leg portion is locked in an annular groove formed in the peripheral wall of the fluid passage. (See Patent Document 1)

JP 2005-147169 A

  In order to reduce the manufacturing cost, it is conceivable to mold the pipe joint with resin. However, in the type having the valve member as described above, an annular groove provided to lock the valve member in the fluid passage. Therefore, it is difficult to mold the resin and it is difficult to reduce the cost.

  In addition, resin pipe joints handle fluids with a relatively low pressure compared to metal pipe joints, but in the case of metal pipe joints, the male and female joint members are fitted. The means for fixedly connecting them is a lock ball provided on the joint body so as to be displaceable in the radial direction, and provided on the outer periphery of the joint body so as to be slidable to control the radial position of the lock ball It is common to consist of a sleeve. However, when handling a low-pressure fluid, it is desired to have a simpler structure instead of this type in terms of manufacturing cost reduction.

  An object of the present invention is to provide a pipe joint which is improved from the above points.

That is, the present invention
A pipe joint composed of a male and female joint member connected and fitted to each other, wherein at least one joint member is
A cylindrical body having a fluid passage;
A valve member that is displaceable in the fluid passage of the cylindrical body and opens and closes the fluid passage;
On the peripheral wall surface of the fluid passage of the cylindrical body,
A valve sliding portion having a first diameter extending rearward from the front end side where the other joint member is fitted and connected;
A valve seat portion having a second diameter smaller than the first diameter at a position rearward of the valve sliding portion;
A rear fluid passage portion having a diameter larger than the second diameter at a rear position from the valve seat portion, and
The valve member is
A slide portion having a sliding surface to be slid with respect to the valve sliding portion, a stem portion extending rearward from the slide portion, and a third diameter connected to the stem portion and smaller than the valve seat portion A valve body having a seal holding portion set at a rear position from the valve seat portion,
An annular seal member attached around the seal holding portion and having a diameter larger than the second diameter, and is spring-biased so that the annular seal member is pressed and engaged with the valve seat portion. Provided is a pipe joint characterized by being configured as described above.

  That is, in this pipe joint, when the valve member is set in the cylindrical body, the seal member is inserted into the cylindrical body from the front end side of the cylindrical body with the seal holding portion at the head, and the seal holding An annular seal member is inserted from the rear end side of the cylindrical main body in a state where the portion is positioned behind the valve seat portion, and is attached to the seal holding portion.

  Specifically, the cylindrical main body is made of resin, and the slide portion is spaced in the circumferential direction between the cylindrical portion that is slidably engaged with the valve sliding portion and the inner peripheral surface of the cylindrical portion. The connecting portion is provided and extends inward in the radial direction, and is connected to the stem portion at the center position of the cylindrical portion.

  Since it is not necessary to provide an annular groove on the inner peripheral surface of the cylindrical main body as in the above-described conventional pipe joint, resin molding of the cylindrical main body can be easily performed. In the slide portion, fluid flows through a flow path formed between the connecting portions.

As one embodiment,
A locking member fixed to one outer peripheral surface of the male and female joint members;
Formed on the outer peripheral surface of the other of the male and female joint members and engaged by the locking member when the male and female joint members are engaged with each other, whereby the male mold And a locking part adapted to connect and fix the female joint member,
The locking member includes a fixing portion fixed to the outer peripheral surface of the one joint member, a locking arm portion having a locking claw that extends forward from the fixing portion and is locked to the locking portion, An unlocking arm portion connected to the front portion of the locking arm portion and extending rearward,
The one joint member has a fulcrum member that engages with a rear portion of the unlocking arm portion,
By pushing down a portion extending rearward from the fulcrum member of the locking release arm toward the outer peripheral surface of the one joint member, the locking action is achieved by lever action using the fulcrum member of the locking release arm as a fulcrum. The arm portion is bent in a direction away from the locking portion so that the locking claw can be unlocked from the locking portion.

  That is, the connecting and fixing means in the above-described conventional pipe joint can have a simple structure.

  In this case, when the locking claw of the locking arm portion is located in the movement path of the outer peripheral surface of the other coupling member fitted to the one coupling member, and the other coupling member is inserted When the other joint member is displaced out of the path and the locking portion reaches the position of the locking claw, it is locked in the locking portion by the elastic force of the locking arm portion. Can do.

Both joint members can be automatically connected and fixed simply by fitting the joint members.
Furthermore,
The unlocking arm portion extends from the locking arm portion at a predetermined interval on the radially outer side of the pipe joint,
The fulcrum member is set between the locking arm part and the locking release arm part so that it can be displaced in the front-rear direction, and the locking release arm is displaced in order to remove the locking claw from the locking part. It is possible to displace between a rear position serving as a fulcrum and a position ahead of the rear position.

In this case, by setting the fulcrum member to the front position, the lever action of the locking release arm is hardly generated, and it is possible to prevent the connection from being inadvertently released.
Further, in another embodiment, the cylindrical main bodies of the male and female joint members are provided with first and second locking projections on the outer peripheral surfaces, respectively.
The first and second locking projections are positioned adjacent to each other when the male and female coupling members are fitted together;
The pipe joint further has a connecting member that prevents the male and female joint members from separating from each other by engaging the first and second locking projections located adjacent to each other. Like that.

Specifically, the connecting member is a pair of circles set so as to engage with each other in the diameter direction of the outer peripheral surface of the cylindrical main body of the male and female joint members fitted to each other. An arcuate part, a connecting part that connects adjacent ends of the arcuate parts at an intermediate position of the arcuate part, and the other part of the arcuate parts at a position opposed to each other in the diameter direction of the connecting part. A setting opening formed between the end portions, an extended end portion extending outwardly from the other end portion and away from each other, and a connection opening extending from the extended end portion to the connecting portion through the arcuate portion Have
When the connecting member is set around the cylindrical member fitted to each other through the setting opening, and the arcuate portion is disposed so as to engage with the outer peripheral surface of the cylindrical main body, The first and second locking projections can be fitted into the connection opening, and the first and second locking projections can be prevented from separating in the axial direction of the pipe joint.

  In order to set the connecting member around the cylindrical main body, the extended end portions are widened so as to be separated from each other, and the cylindrical main body is fitted into the connecting member through the setting opening widened accordingly. The first and second locking protrusions are fitted into the connecting dissolution holes.

  As can be seen from the above, in the present invention, it is not necessary to provide a recess such as an annular groove on the inner peripheral surface of the cylindrical main body as in the prior art, and therefore it is easy to resin-mold the cylindrical main body. It becomes.

  In addition, the means for connecting the male and female joint members has a simpler structure and is easier to manufacture than the conventional means.

  Therefore, according to the present invention, the manufacturing cost can be greatly reduced.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pipe joint according to the present invention will be described with reference to the accompanying drawings.

  1 is a cross-sectional view of the upper part of the male and female joint members 12, 14 of the pipe joint 10 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 3 is a side view showing a state in which the male and female joint members 12 and 14 are connected, and FIG. 4 is a plan view of the pipe joint of FIG.

  As shown, both the male and female joint members 12 and 14 are made of resin-made cylindrical main bodies 20 and 22 having fluid passages 16 and 18, and the fluid passages 16 and 18 of the cylindrical main bodies 20 and 22. And has valve members 24 and 26 for opening and closing the fluid passage.

  The cylindrical main body 20 has, on its inner peripheral surface, a front receiving portion 30 into which the cylindrical main body 22 of the male joint member 14 is fitted from the front end toward the rear end, and a valve having a smaller diameter than the front receiving portion. A sliding portion 32, a spring holding portion 34 having a diameter slightly smaller than that of the valve sliding portion 32, a valve seat portion 36 having a diameter smaller than that of the spring holding portion, and a rear fluid passage portion having substantially the same diameter as the valve sliding portion 32 38 is formed. Further, the cylindrical main body 20 has an annular locking groove 40 at a front position on the outer peripheral surface thereof.

  The valve member 24 includes an annular slide portion 42 (FIG. 2) having a sliding surface that is slid with respect to the valve sliding portion 32, a stem portion 44 that extends rearward from the slide portion 42, and the stem portion 44, and has a valve body composed of a seal holding portion 46 that has a smaller diameter than the valve seat portion 36 and is set at a rear position from the valve seat portion 36.

  As shown in FIG. 2, the slide portion 42 is connected to the valve stem portion 44 by a connecting portion 48 that is equally spaced in the circumferential direction of the inner peripheral surface thereof. The seal holding portion 46 is shaped like an abacus ball, and an annular groove is formed in the central portion having the largest diameter, and an annular seal 50 such as an O-ring is fitted and set in the groove. .

  The coil spring 52 is concentric with the valve stem 44 between the valve seat portion 36 of the cylindrical body 20 and the slide portion 42 of the valve member 24 in a state where the coil spring 52 is substantially in contact with the spring holding portion 34 of the cylindrical body 20. The valve member 24 is urged forward to press the annular seal member 50 against the valve seat portion 36.

  When the valve member 24 is set in the cylindrical main body 20, the coil spring 52 is inserted and set in advance in the cylindrical main body 20, and the seal holding portion 46 is used as the head, from the front end side of the cylindrical main body 20. The annular seal member 50 is inserted from the rear end side of the cylindrical main body in a state where the cylindrical main body is inserted into the cylindrical main body and the seal holding portion 46 is positioned behind the valve seat 36. Attach to.

  Similar to the female joint member 12, the male joint member 14 is formed in the through hole of the cylindrical main body 22 from the front end to the rear in the sliding portion 54, the spring holding portion 56, the valve seat portion 58, the rear fluid. A passage portion 60 is formed, and the valve member 26 includes a slide portion 62 slidably set on the slide portion 54, a stem portion 64, and a seal holding position that is positioned rearward of the valve seat portion 58. A member 66 and an annular seal member 68 such as an O-ring held by the seal holding member 66 and abutted against the valve seat 58 are urged forward by a coil spring 70.

  The attachment of the valve member 26 to the cylindrical main body 22 is the same as in the case of the female joint member.

  The male joint member 14 is provided with an annular seal member 72 such as an O-ring in the vicinity of the front end of the outer peripheral surface thereof, and can be released to a locking groove 40 formed on the outer periphery of the female joint member 12 at a rear position thereof. And a locking member 74 is provided for connecting and fixing the male joint member 14 fitted to the female joint member 12. In other words, this locking member is fixed to the annular fixing portion 76 set around the male joint member 14, and extends forward from the fixing portion, and is locked to the locking groove 40 of the female joint member 12. It has a locking arm portion 80 having a locking claw 78 and a locking release arm portion 82 connected to the front end portion of the locking arm portion and extending rearward. The fixing portion 76 is fixed by an annular protrusion 84 formed on the outer peripheral surface of the cylindrical main body 22 and an annular locking member 86 fitted on the outer peripheral surface.

  An annular fulcrum member 90 is integrally formed at the front end portion of the outer peripheral surface of the annular locking member 86 and is engaged with the unlocking arm portion 82.

  FIG. 5 shows a state in which the male and female joint members 12 and 14 are started to be fitted, and FIG. 6 shows a state in which the fitting is finished.

  As can be seen from these drawings, when the fitting is started, the contact pins 92 and 93 extending forward from the center of the tip of the valve member of the male and female joint members 12 and 14 respectively contact each other. In contact with each other, the valve members 24 and 26 are retracted, and the annular seal members 50 and 68 are separated from the valve seat portions 36 and 58 so that the respective fluid passages communicate with each other.

  Further, the locking member 74 has its locking claw 78 positioned in the movement path of the outer peripheral surface of the female joint member 12 (path that moves during the fitting), and the fitting of the male and female joint members proceeds. Then, the locking claw 78 engages with the outer peripheral surface and is displaced in a direction away from the female joint member 12, and accordingly, the locking arm portion 80 is bent and the locking release arm portion 82 is a fulcrum. The member 90 is inclined about the center. When the locking claw 78 is in a position where it overlaps the locking groove 40, the locking arm portion 80 fits the locking claw 78 into the locking groove 40 due to its elasticity, so that the male and female joint members 12, 14 They are connected and fixed to each other.

  In order to release the connection between the male and female joint members in the connected state of FIG. 6, the rear end portion of the locking release arm portion 82 is pressed so as to approach the cylindrical body of the male joint member. The stop release arm 82 is operated with the fulcrum member 90 as a fulcrum, and the locking claw 78 is removed from the locking groove 40.

  As shown in FIGS. 3 and 4, in this embodiment, a pair of locking members 74 are provided at positions facing each other in the diameter direction of the cylindrical main body 22.

  7 and 8 have a configuration almost similar to that of the above embodiment, but the fulcrum member 90 is an annular member set between the locking arm portion 80 and the locking release arm portion 82. A rear position (FIG. 7) that is displaceable in the front-rear direction and serves as a fulcrum for displacing the locking release arm 82 to remove the locking claw 78 from the locking groove 40, and forward of the rear position. It is possible to displace between the positions (FIG. 8). In addition, since this pipe joint is the same as that of the above-described embodiment except that a tubular member 22 'bent at a right angle is connected to the cylindrical main body 22, the same reference numerals are assigned to the same elements. A detailed description thereof will be omitted.

  In this pipe joint, when the male and female joint members are fitted and connected by the locking member 74, the fulcrum member 90 is set to the front position (FIG. 8), so that the locking release arm portion Even when a force is applied to 82 to push it down, the locking claw 78 can be prevented from being easily detached from the locking groove 40.

  9 to 12 show an embodiment in which the male and female joint members are connected and fixed by other types of locking members. The male and female joint members according to this embodiment are the same as those of the above-described embodiment except that the means for connecting and fixing are different, so the same elements are given the same reference numerals, Detailed description thereof is omitted.

  That is, the male and female joint members 12 and 14 according to this embodiment are annularly abutting against each other as shown in FIG. 9 in a state in which the joint members 12 and 14 have been fitted to the outer peripheral surface. First and second contact portions 94 and 96 are provided. 10 and 11 show a connecting member 98 for connecting the male and female joint members. The connecting member 98 includes a pair of arcuate portions 100 and 100 that are opposed in the diameter direction, a central connecting portion 102 that connects one end thereof, and the other end of the arcuate portions 100 and 100 outward. It consists of extended end portions 101 and 101 extending away from each other.

  When the male and female joint members 12 and 14 are fitted to each other to be in the state shown in FIG. 12, the connecting member 98 passes through the opening 103 on the diametrically opposite side of the connecting portion 98 and the first and The second contact portions 94 and 96 are fitted around. As shown in FIG. 11, elongated openings 104 and 104 extending from the extended end portions 101 and 101 through the arc-shaped portions 100 and 100 to the central coupling portion 102 are formed, and the arc-shaped portions 100 and 100 are male and female. When engaged with the outer peripheral surface of the mold joint member, the first and second contact portions 94 and 96 extend outward through the openings 104 and 104 of the arcuate portions, and both side edges of the openings 104 and 104. 106 and 106 prevent the pipe joint from moving in the axial direction.

It is the figure which showed the upper part of the male type | mold and female type | mold joint member of the pipe joint which concerns on the 1st Embodiment of this invention in the cross section. FIG. 2 is a sectional view taken along line II-II in FIG. It is a side view which shows the state with which the male type | mold and the female type | mold joint member were connected. It is a top view of the pipe joint of FIG. It is sectional drawing of the upper half part which shows the state which started fitting a male type | mold and a female type | mold joint member. It is sectional drawing of the upper half part when the fitting of a male type | mold and a female type | mold joint member is completed. It is the figure which showed the upper part of the male type | mold and female type | mold joint member in the cross-section when the mutual completion of the pipe joint which concerns on the 2nd Embodiment of this invention was performed. It is the figure which showed the upper part of the male type | mold and female type | mold joint member of the state which displaced the fulcrum member ahead in the same pipe joint by the cross section. It is the figure which showed the upper part of the male type | mold and female type | mold joint member of the pipe joint which concerns on the 3rd Embodiment of this invention in the cross section. It is the figure which looked at the connecting member for connecting and fixing the pipe joint of the embodiment in the axial direction of the pipe joint. It is a side view of the connection member. It is a figure which shows the state attached to the male type | mold and female type | mold joint member which fitted the connection member mutually.

Explanation of symbols

Pipe joint 10; Female joint member 12; Male joint member 14; Fluid passage 16, 18; Cylindrical body (tubular body) 20, 22; Pipe member 22 '; Valve member 24, 26; Valve sliding part 32; Spring holding part 34; Valve seat part 36; Rear fluid passage part 38; Locking groove (locking part) 40; Slide part 42; Stem part 44; Seal holding part 46; Seal 50; Coil spring 52; Sliding part 54; Spring holding part 56; Valve seat part 58; Rear fluid passage part 60; Slide part 62; Stem part 64; Ring seal member 68; Coil spring 70: Ring seal member 72; Fixing member 76; locking claw 78; locking arm portion 80; locking release arm portion 82; annular protrusion 84; annular locking member 86; fulcrum member 90; And second contact portions (first and second locking projections) 94, 96; connecting member 98; arcuate portions 100, 100; extended end portions 101, 101; central connecting portion (connecting portion) 102; Openings (connection openings) 104, 104; side edges 106, 106

Claims (5)

A pipe joint composed of male and female joint members connected and fitted to each other,
A locking member fixed to one outer peripheral surface of the male and female joint members;
Formed on the outer peripheral surface of the other of the male and female joint members and engaged by the locking member when the male and female joint members are engaged with each other, whereby the male mold And a locking portion for connecting and fixing the female joint member;
With
The locking member includes a fixing portion fixed to the outer peripheral surface of the one joint member, a locking arm portion having a locking claw that extends forward from the fixing portion and is locked to the locking portion. A locking release arm portion connected to the front portion of the locking arm portion and extending backward,
The one joint member has a fulcrum member that engages with a rear portion of the unlocking arm portion,
By pushing down a portion extending rearward from the fulcrum member of the locking release arm toward the outer peripheral surface of the one joint member, the locking action is achieved by lever action using the fulcrum member of the locking release arm as a fulcrum. The arm portion is bent in a direction away from the locking portion, and the locking claw can be unlocked from the locking portion,
When the locking claw of the locking arm portion is located in the movement path of the outer peripheral surface of the other coupling member fitted into the one coupling member, the other coupling member is inserted into the other coupling member. When the engagement portion is displaced outside the path by the joint member, and the engagement portion reaches the position of the engagement claw, it is configured to be engaged in the engagement claw by the elastic force of the engagement arm portion,
The unlocking arm portion extends from the locking arm portion at a predetermined interval on the radially outer side of the pipe joint,
The fulcrum member is set between the locking arm portion and the locking release arm portion, and can be displaced in the front-rear direction, and the locking release arm is displaced to remove the locking claw from the locking recess. A pipe joint characterized by being displaceable between a rear position serving as a fulcrum for the position and a position ahead of the rear position . At least one of the male and female joint members is
A cylindrical body having a fluid passage;
A valve member displaceable in the fluid passage of the cylindrical body and opening and closing the fluid passage;
Have
On the peripheral wall surface of the fluid passage of the cylindrical body,
A valve sliding portion having a first diameter extending rearward from the front end side where the other joint member is fitted and connected;
A valve seat portion having a second diameter smaller than the first diameter at a position rearward of the valve sliding portion;
A rear fluid passage portion having a diameter larger than the second diameter at a position behind the valve seat portion;
Formed,
The valve member is
A slide portion having a sliding surface to be slid with respect to the valve sliding portion, a stem portion extending rearward from the slide portion, and a third diameter connected to the stem portion and smaller than the valve seat portion A valve body having a seal holding portion set at a rear position from the valve seat portion,
An annular seal member attached around the seal holding portion and having a diameter larger than the second diameter;
2. The pipe joint according to claim 1 , wherein the annular seal member is pressed and engaged with the valve seat portion by being biased by a spring . 3. The cylindrical body is made of resin,
The slide part is a cylindrical part that is slidably engaged with the valve sliding part, and is provided on the inner peripheral surface of the cylindrical part at a circumferential interval and extends radially inward. The pipe joint according to claim 2 , further comprising a connecting portion connected to the stem portion at a central position of the pipe. The male and female joint members have first and second locking projections on their outer peripheral surfaces, respectively.
The first and second locking projections are positioned adjacent to each other when the male and female coupling members are fitted together;
The pipe joint further has a connecting member that prevents the male and female joint members from separating from each other by engaging the first and second locking projections located adjacent to each other. The pipe joint according to any one of claims 1 to 3 . The connecting member includes a pair of arcuate portions which are configured to engage the cylindrical outer peripheral surface mutually facing portions in the diametrical direction of the main body of the mutually mated male and female coupling members, It is arranged at an intermediate position in the circumferential direction of the arcuate part, and connects the end parts of both arcuate parts, and a position of the arcuate parts opposite to each other in the diametrical direction in the tubular body. a setting opening which is formed between the extension end extending in a direction and away from each other outwardly from the end of the circular arc-shaped portion across the opening for the setting through the the circular arc portion from the extension end A connecting opening that reaches the connecting portion,
When the connecting member is set around the cylindrical member of the male and female joint members fitted to each other such that the arcuate portion engages the outer peripheral surface of the cylindrical body , claims, wherein the first and second and the locking projection is fitted in the coupling opening the first and second locking projections is such that prevents the leaves in the axial direction of the fitting Item 5. The pipe joint according to Item 4 .

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