JPH0712686U - Connector - Google Patents

Abstract

(57) [Summary] [Purpose] The O-ring for gas leakage prevention used in the connector for high-pressure gas piping is easily replaced, and a reliable leakage prevention function is guaranteed even after replacement and reassembly. [Structure] An attaching / detaching portion 2 which is slidably fitted to the outer periphery of a second cylindrical portion 22 formed integrally with a sleeve 3 and is detachable in the axial direction.
3, and the second O-ring 15 is housed in the packing groove 8 formed along the outer periphery of the attachment / detachment portion 23. The first O-ring 21 and the attaching / detaching portion 23 are attached and fixed to the sleeve 3 by screwing the nut portion 19 onto the first male screw portion 18. The replacement of the O-ring 15 is performed for each attachment / detachment unit 23.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a connector for airtightly connecting steel pipes for high-pressure gas piping, for example.

[0002]

[Prior art]

 FIG. 5 shows the external appearance of a conventional connector of this kind, which is used, for example, in a concentrating portion of a high-pressure gas pipe required in a high-pressure gas facility. In the figure, 1 is a valve body for opening and closing a gas flow, which is attached to a collecting pipe container (not shown), and 2 is a high pressure gas pipe that constitutes a gas flow path to a high pressure gas supply source or a load device (not shown) (hereinafter, 3 is a sleeve as a first member to be connected, which will be described later in detail, and is integrally formed with the pipe 2 by welding or the like so that the inside is in communication. Reference numeral 4 denotes a valve port as a second member to be connected, which will be described later in detail, but is formed integrally with the valve body 1 and communicates with the on-off valve portion thereof. Reference numeral 5 is a cap nut as a tightening member for integrally connecting the sleeve 3 and the valve port 4.

Next, details of each part will be described with reference to a sectional view shown in FIG. First, the sleeve 3 is formed with a through hole 6 which forms a flow passage for high-pressure gas in the axial center thereof. Further, the outer periphery of the connecting end side (the left side in FIG. 6) constitutes a packing portion 7 machined into a cylindrical surface having a predetermined outer diameter, and a packing groove 8 is formed along the outer periphery thereof. The convex portion 9 adjacent to the packing portion 7 is the maximum diameter portion of the sleeve 3, and the portion to the right of the convex portion 9 is the first base portion 10 having a reduced outer diameter. The pipe 2 shown in FIG. 5 is joined to the first base portion 10 by welding or the like.

Next, the valve port 4 has a substantially cylindrical shape with a through hole 11 formed therein, and the inner periphery of the fitting portion 12 on the connecting end side (right side in FIG. 6) of the packing portion 7 of the sleeve 3 has a predetermined shape. The outer peripheral surface of the fitting portion 12 is formed with a male screw portion 13 having a diameter larger than the outer diameter of the convex portion 9, the outer peripheral surface of the fitting portion 12 being finished by fitting through the gap. The root portion of the valve port 4 forms the second base portion 14. Reference numeral 15 is an O-ring housed in the packing groove 8. Next, the cap nut 5 is formed with a female screw portion 16 that can be screwed into the male screw portion 13 of the valve port 4, and the inner diameter of its head portion 17 is smaller than the outer diameter of the convex portion 9 of the sleeve 3. It is set to be larger than the outer diameter of the base portion 10.

Next, the procedure for assembling the above-described conventional connecting tool will be described with reference to FIG. First, the O-ring 15 is fitted into the packing groove 8 formed in the packing portion 7 of the sleeve 3. Then, the sleeve 3 and the valve port 4 are held on the same shaft, and then the packing portion 7 of the sleeve 3 is fitted into the fitting portion 12 of the valve port 4. Here, by setting the O-ring 15, the outer diameter of the packing portion 7, the inner diameter of the fitting portion 12, and the dimensions of the packing groove 8 to appropriate values, the O-ring 15 can be set to the sleeve 3 and the valve port. The gap with 4 is closed to surely prevent gas from leaking from this gap. Next, the cap nut 5 is inserted from the right to the left, and the female screw portion 16 thereof is screwed and tightened to the male screw portion 13 of the valve port 4. This tightening is completed by pinching and pressing the convex portion 9 of the sleeve 3 in the axial direction by the head portion 17 of the cap nut 5 and the fitting portion 12 of the valve port 4.

The advantages of the connector having this structure are listed below. That is, the pressing force required to exert the original leakage prevention function on the O-ring 15 is determined mainly by the size of each part that determines the accommodation space of the O-ring 15, and the sleeve 3 and the valve port. The point is that it is not affected by the force for connecting 4 and 4 together. For example, in the structure of the prior art in which the packing is interposed between the convex portion 9 of the sleeve 3 and the fitting portion 12 of the valve port 4 in FIG. There were drawbacks such as excessive force and damage to the packing, and conversely, insufficient tightening force resulted in incomplete leak prevention, resulting in difficulty in assembly work.

Another great advantage of the method of FIG. 6 is that the pressure applied to the O-ring 15 does not change even after the assembly is completed and during use, even if the threaded portion is slightly loosened due to some cause during use. Since it does not exist, the leak prevention function must be retained as it is.

[0008]

[Problems to be solved by the device]

 Since the conventional connecting device is configured as described above, it has various advantages as described above and is highly useful, but when examined from the viewpoint of continuous use in the field equipment for a long period of time, It turns out that there are problems that cannot be ignored. That is, the operating conditions such as the temperature at the site are sometimes extremely strict, and in general, the O-ring made of synthetic resin reaches its life in a shorter period than other components. In consideration of this, concretely, for example, the work of replacing only the O-ring of the connecting tool with a new one is performed every year, for example. In this work, the connection is released in the reverse order of the assembly procedure described above, the used O-ring 15 is removed from the packing groove 8 of the sleeve 3, and the O-ring is replaced with a new one.

The problem arises when the used O-ring 15 is removed. That is, in this case, the dimensions are small, and the O-ring 15 may be considerably hardened at this point, and an appropriate claw-shaped jig is required for removal, but in an actual work site it is normal. In many cases, instead of jigs, there are many abundant objects such as nails that are used for removal. In such a case, the packing groove 8 is often damaged, and if it is reassembled as it is, a sufficient airtight function cannot be obtained. When the damaged sleeve 3 is to be replaced, as shown in FIG. 5, since the sleeve 3 is connected to the related equipment through the pipe 2, the work is extensive and the time and cost are heavy. .

The present invention has been made in order to solve the above problems, and it is extremely easy to replace the O-ring, and moreover, a connector capable of reliably achieving the leakage prevention function after conversion and reassembly. Aim to get.

[0011]

[Means and Actions for Solving the Problems]

 In the connector according to the present invention, the packing part of the first member to be connected is slidably fitted to the shaft part having the male screw part at the tip of the connecting end side integrally with the convex part and the outer periphery of the shaft part. Is detachable in the axial direction and has a packing groove for accommodating an O-ring on its outer periphery, and the male screw portion of the shaft portion is screwed to the convex portion to sandwich the detachable portion in the axial direction. A nut portion to be fixed, and an O-ring that is housed in a space formed by the nut portion, the attachment / detachment portion and the shaft portion and that seals a gap between the attachment / detachment portion and the shaft portion in an airtight and liquid-tight manner. Is. In this case, in order to replace the O-ring, first, the screwing of the nut portion is tightened to remove it from the first member to be connected, and the attaching / detaching portion with the O-ring accommodated in the packing groove is pulled out from the first member to be connected. Replace the removed attachment / detachment part with a new O-ring in the packing groove, and attach a new attachment / detachment part in the same way as when initially assembling.

[0012]

【Example】

 1 is a sectional view showing a connector according to a first embodiment of the present invention. In the figure, the same parts as those of the related art are designated by the same reference numerals and the description thereof will be omitted. Therefore, the sleeve 3 and a portion detachably attached thereto will be mainly described below. The sleeve 3 is similar to the conventional one in that the through hole 6 is formed in FIG. 1 as well, but the outer peripheral shape is different from the conventional one, and the sleeve 3 is connected from the connecting end side (left side in FIG. 1). This will be explained sequentially.

First, a first male screw portion 18 is formed at the tip and a nut portion 19 described later is screwed. Next, a first cylindrical portion 20 having the same diameter as the first male screw portion 18 is formed, and this also constitutes one surface forming a space for accommodating a first O-ring 21, which will be described later. Next is a second cylindrical portion 22 having a larger diameter than the first cylindrical portion 20 and having an outer diameter smaller than the outer diameter of the conventional packing portion 7 by the amount of fitting the detachable portion 23, which will be described later, on the outer periphery. . The next third cylindrical portion 24 is equivalent to the conventional convex portion 9. The root portion at the right end is the first base portion 10.

The attachment / detachment portion 23 is configured to be slidably fitted on the outer periphery of the second cylindrical portion 22 so as to be detachable in the axial direction, and the packing groove 8 for accommodating the second O-ring 15 is formed on the outer periphery thereof. ing. The nut portion 19 is screwed with the first male screw portion 18 to attach and fix the attaching / detaching portion 23 integrally with the sleeve 3.

Next, a procedure for assembling the connector according to the first embodiment will be described. FIG. 2 is a diagram showing a state before the sleeve 3 and the components fixed integrally with the sleeve 3 are assembled. First, the attaching / detaching portion 23 in which the second O-ring 15 is housed in the packing groove 8 is fitted into the second cylindrical portion 22 of the sleeve 3. Next, after inserting the first O-ring 21 into the groove formed by the outer peripheral surface of the first cylindrical portion 20, the left side surface of the second cylindrical portion 22 and the inner peripheral surface of the attaching / detaching portion 23, the nut is inserted. The portion 19 is screwed into the first male screw portion 18, and the attaching / detaching portion 23 is integrally fixed to the sleeve 3 with the third cylindrical portion 24. Here, since it is equivalent to the sleeve 3 shown in FIG. 6 of the related art, the assembly as a connecting tool can be carried out in the same manner as the prior art.

In this case, the gap between the attachment / detachment portion 23 and the fitting portion 12 of the valve port 4 closes the second O-ring 15 as in the conventional case to prevent leakage from this portion. In addition, since the conventional packing has a double structure, the first O-ring 21 reliably ensures the leakage from the gap between the attachment / detachment portion 23 and the second cylindrical portion 22 of the sleeve 3, which is a newly generated gap. Block.

When the O-rings 15 and 21 are replaced, the work is performed in the reverse order to the above description, and the nut 3 is first loosened from the sleeve 3 in which the attaching / detaching portion 23 is integrated, and the first O-ring is replaced. The ring 21 and the attachment / detachment portion 23 are separated from the sleeve 3, and a new replacement is attached. In this case, since the new second O-ring 15 is housed in the new attachment / detachment section 23, there is no need to remove the second O-ring 15 itself, and the handling at the site becomes extremely simple, and The leak prevention function after assembly is also reliably achieved.

3 and 4 are cross-sectional views showing a connector according to a second embodiment of the present invention. The difference from the first embodiment is the structure of the portion that accommodates the first O-ring 21. In the case of the first embodiment, the step for securing the accommodation space of the first O-ring 21 is formed on the sleeve 3 side (the first cylindrical portion 20 and the second cylindrical portion 22). In the case of 2, it is formed on the attaching / detaching portion 23 side. That is, as shown in FIGS. 3 and 4, the sleeve 3 side is followed by the first male screw portion 18 at the tip and the first cylindrical portion 20 having the same diameter. Then, the third cylindrical portion 24 having an outer diameter larger than this becomes the maximum outer diameter portion (corresponding to the convex portion). An enlarged diameter portion 25 having an enlarged inner peripheral diameter is formed on the first male screw portion 18 side (left side in the drawing) of the attachment / detachment portion 23, and the first O-ring 21 is accommodated therein.

The procedure for assembling, disassembling, and replacing the O-rings 15 and 21 is the same as that of the first embodiment, so the description thereof will be omitted. However, replacement work of the O-ring is extremely simple, and leakage prevention after reassembly is prevented. The same effect as that of the first embodiment is achieved in that the function is surely achieved.

In each of the above embodiments, the second O-ring 15 and the attachment / detachment portion 23 are both replaced with new ones. However, the attachment / detachment portion 23 together with the used O-ring 15 is removed from the sleeve 3. After the removal, the O-ring 15 may be removed from the attaching / detaching part 23 with a dedicated jig and only the O-ring 15 may be replaced with a new one. In this case, the object handled by the jig is the small-sized detachable portion 23 having a simple shape, so that the handling becomes easy.

In each of the above embodiments, the case where the target fluid inside the connector is a high-pressure gas has been described, but it goes without saying that it may be a liquid. Further, although one packing groove 8 is formed in the attachment / detachment portion 23 to accommodate one O-ring 15, it is necessary to enhance the leakage prevention function or in relation to the specifications of the O-ring. The present invention can be similarly applied to a structure in which more than one packing groove is formed in parallel and the O-ring is housed in each groove, and in that case, the effect of the present invention can exert a higher value. There is expected.

[0022]

[Effect of device]

 As described above, according to the present invention, the packing portion of the first member to be connected is composed of the predetermined shaft portion, the attaching / detaching portion, the nut portion, and the O-ring, so that the replacement work of the O-ring is extremely simple. In addition, the function of preventing leakage of the O-ring after replacement and reassembly is surely achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a connector according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an assembling procedure of main parts of FIG.

FIG. 3 is a sectional view showing a connector according to a second embodiment of the present invention.

FIG. 4 is a diagram for explaining an assembling procedure of main parts of FIG.

FIG. 5 is a diagram showing an appearance of a conventional connecting tool.

6 is a cross-sectional view showing the internal structure of FIG.

[Explanation of symbols]

 3 Sleeve as 1st connected member 4 Valve opening as 2nd connected member 5 Cap nut 6, 11 Through hole 7 Packing part 8 Packing groove 9 Convex part (3rd cylindrical part 24) 10 1st Base portion 12 Fitting portion 13 Male screw portion 14 Second base portion 15 Second O-ring 16 Female screw portion 17 Head portion 18 First male screw portion 19 Nut portion as shaft portion 20 First cylinder as shaft portion Part 21 First O-ring 22 Second cylindrical part as shaft part 23 Attachment / detachment part 24 Third cylindrical part as convex part 25 Expanded part

Claims (3)

[Scope of utility model registration request] 1. A substantially cylindrical shape having a through hole formed in the axial direction, and a convex portion having an outer diameter larger than that of other portions is formed at a predetermined position in the axial direction, and a portion on the connecting end side of the convex portion is formed. A packing part and a portion on the side opposite to the connecting end are used as a first base part, and the packing part has a first connected member in which a packing groove is formed along the outer periphery thereof, and a substantially through hole is formed in the axial direction. Cylindrical, its connecting end side is a fitting part and its anti-connecting end side is a second base part, and the inner periphery of the fitting part is a cylindrical surface on which the packing part is fitted through a predetermined gap, The outer periphery of the fitting portion is a second connected member formed in a male screw portion having an outer diameter larger than the convex portion, and is accommodated in the packing groove and interposed in a gap between the packing portion and the fitting portion. An O-ring that closes this part airtightly and liquid-tightly, and a female screw that is in the shape of a cap nut and that can be screwed into the male screw part. A head portion having an inner diameter smaller than the outer diameter of the convex portion and larger than the outer diameter of the first base portion,
Tightening for connecting the first and second connected members in an air-tight and liquid-tight manner by screwing the two screw parts together and sandwiching and fixing the convex part in the axial direction by the head part and the fitting part. In a connector provided with a member, a packing part of the first member to be connected is a shaft part which is integrally formed with the convex part and has a male screw part at a tip of a connecting end side, and is slidably fitted on an outer periphery of the shaft part. Then, the attaching / detaching portion is axially attachable / detachable, and the attaching / detaching portion is formed by forming a packing groove for accommodating the O-ring on the outer periphery thereof and the male screw portion of the shaft portion. The nut part that is clamped and fixed to the
A coupling tool comprising an O-ring which is housed in a space formed by the attachment / detachment portion and the shaft portion and seals a gap between the attachment / detachment portion and the shaft portion in an airtight and liquid-tight manner. 2. A through hole having a predetermined diameter is formed in the center of the shaft, and the outer periphery is sequentially provided with a first male screw portion having a predetermined diameter and a predetermined axial length from the connecting end side, and a predetermined diameter same as the first male screw portion. A first cylindrical portion having an axial length, and a second cylindrical portion having a diameter larger than the first cylindrical portion and having a predetermined axial length.
A cylindrical portion, a third cylindrical portion having a diameter larger than the second cylindrical portion and having a predetermined axial length, and a first base portion having a diameter smaller than the third cylindrical portion and having a predetermined axial length are formed. 1 connected member,
The first male screw portion, the first and second cylindrical portions of the first male screw portion, the first and second cylindrical portions, each of which has a packing groove formed along the outer periphery thereof so as to be slidably fitted to the outer periphery of the second cylindrical portion and detachable in the axial direction. A nut part that has an axial length shorter than the sum of the lengths, a nut part that is screwed into the first male screw part and clamps the detachable part in the axial direction with the third cylindrical part, the side face of the nut part and the above It is housed in a space formed by the outer peripheral surface of the first cylindrical portion, the side surface of the second cylindrical portion, and the inner peripheral surface of the detachable portion, and is accommodated in the space between the detachable portion and the second cylindrical portion. A first O-ring for preventing fluid leakage, a substantially cylindrical shape with a through hole formed in the axial direction, the connecting end side of which is a fitting part and the opposite connecting end side of which is a second base part,
The inner circumference of the fitting portion is a cylindrical surface that fits the detachable portion with a predetermined gap, and the outer circumference of the fitting portion is a second male screw portion having an outer diameter larger than the third cylindrical portion. A formed second connected member, a second O-ring that is housed in the packing groove, is interposed in a gap between the attachment / detachment portion and the fitting portion, and prevents fluid from leaking from the gap, and a cap nut. The above, the second
And a head portion having an inner diameter smaller than the outer diameter of the third cylindrical portion and larger than the outer diameter of the first base portion, and the second male screw portion. And the female threaded portion are screwed together, and the third cylindrical portion is axially clamped and fixed by the head portion and the fitting portion, so that the first and second connected members are airtight and liquidtight. A coupling tool having a fastening member for coupling. 3. A through hole having a predetermined diameter is formed at the center of the shaft, and the outer periphery is sequentially provided with a first male screw portion having a predetermined diameter and a predetermined axial length from the connecting end side, and a predetermined diameter which is the same as the first male screw portion. A first cylindrical portion having an axial length, and a third cylindrical portion having a diameter larger than the first cylindrical portion and having a predetermined axial length.
A first connected member having a cylindrical portion and a first base portion having a diameter smaller than that of the third cylindrical portion and having a predetermined axial length, and is slidably fitted on the outer periphery of the first cylindrical portion. Removable in the axial direction, a packing groove is formed along the outer periphery thereof, and has a shaft length shorter than the sum of the axial lengths of the first male screw portion and the first cylindrical portion, and the first male screw portion side The inner peripheral diameter of the second mounting portion is enlarged over a predetermined axial length, and the second male member is screwed into the first male screw portion.
And a nut portion for sandwiching and fixing the detachable portion in the axial direction with the cylindrical portion, and is housed in a space formed by the side surface of the nut portion, the outer peripheral surface of the first cylindrical portion, and the inner peripheral surface of the detachable portion. A first O-ring for preventing fluid from leaking from a gap between the attachment / detachment portion and the first cylindrical portion, a substantially cylindrical shape having a through hole formed in an axial direction, and a connecting end side thereof being a fitting portion, The anti-connection end side is the second base portion, the inner circumference of the fitting portion is a cylindrical surface that fits the detachable portion through a predetermined gap, and the outer circumference of the fitting portion is the third outer diameter. A second connected member formed in a second male screw portion larger than the cylindrical portion of the above, a fluid is leaked from this gap which is housed in the packing groove and is interposed in the gap between the attaching / detaching portion and the fitting portion. A second O-ring for preventing the above, and a cap nut-shaped female screw portion that can be screwed into the second male screw portion and an inner diameter of the third male screw portion. A head portion smaller than the outer diameter of the cylindrical portion and larger than the outer diameter of the first base portion, and the second male screw portion and the female screw portion are screwed together to form the head portion and the fitting portion. A connector including a tightening member for air-tightly and liquid-tightly connecting the first and second members to be connected to each other by sandwiching and fixing the third cylindrical portion in the axial direction.