JPS584231B2 - Cantugate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe joint for use in piping that requires permanent airtightness, such as piping for air conditioning equipment.

For pipe fittings that are used for piping that requires permanent airtightness, a metal seal ring is used as the sealing mechanism, and by tightening a union nut, the outer periphery of the metal seal ring can be attached to the end faces of both male and female members that make up the pipe fitting. There are some structures that are cut into the structure.

However, with such a structure, the perfect sealing effect of the metal seal ring cannot be expected unless measures such as regulating the tightening force of the union nut with a torque wrench are taken.

Moreover, when attempting to tighten the union nut using a torque wrench in a narrow space, the torque wrench is difficult to use, and the sealing effect is further impaired.

In addition, this type of pipe joint has a valve body on both the male and female members, and has a structure in which the sliding valves press against each other to open when connected, but conventional pipe joints have a valve body and attached members. After installing the pipe into the main cylinder member of the pipe joint, many processes are required such as drawing, cleaning, and brazing of the joint pipe, which requires equipment and personnel for the work and leakage inspection, which increases the cost. It was causing me to get high.

In view of the above-mentioned drawbacks of a pipe joint equipped with a sealing mechanism and a valve mechanism using a metal seal ring, the present invention
The purpose is to eliminate such drawbacks, improve the completeness of the sealing effect, improve the ease of connecting both male and female members, and further reduce production costs.Based on the embodiment shown in the drawings below, The present invention will be explained in detail.

In the following description, the "front end" refers to the side where both the male and female members are connected to each other, and the "rear end" refers to the side where the conduit is connected to both the male and female members.

The pipe joint of the present invention includes both male and female members 10 and 60, and both members 10 and 60.
．． 60 coupling means 100.

First, the main cylinder part 12 constituting the male member 10 has an inner diameter that allows the valve mechanism 42 described below to be inserted from the front end opening side.
6 and a rear end cylindrical portion 2 to which a conduit 18 can be connected to the rear end small diameter open end.
It consists of two parts of 0, and is not two parts joined by brazing as in the conventional example, but is a single structural tube body, and a truncated conical surface 14 is formed on the outer periphery of the open end side of the front end cylinder part 16. , an appropriate number of disc springs 2 are provided on the rear end side of the outer peripheral flange portion 22 of the main cylinder portion 12.
4 and a receiver 26 for the disc spring are respectively fitted, and a stop ring 28 prevents these two members 24 and 26 from coming off.

30 is a valve body fixed inside the front end cylinder part 16, 36 is a sliding valve that comes into contact with the valve head 32 of the valve body 30 from the right direction in FIG. The valve train 36 is urged by a spring 38.

40 is a holding piece fixed to the rear end of the valve body 30;
0, sliding valve 36, elastic sealing rings 34, 35, spring 38
and the valve mechanism 4 assembled in advance with each member of the holding piece 40.
2 is inserted into the front end opening of the main cylinder portion 12.

The holding piece 40 has a large number of fluid guide holes 44 protruding in the axial direction, and also has an outer circumferential groove 46;
6, an inner circumferential groove 50 is formed on the inner surface 48 of the main cylinder portion 12.
The outer circumferential groove 46 of the valve mechanism 42 assembled in advance by forming
The stop ring 52 is placed in the inner circumferential groove 50 and the stop ring 52 is engaged with the inner circumferential groove 50 to position the valve mechanism 42 so as not to move in the axial direction with respect to the main cylinder portion 12.

The front end opening of the inner surface 48 of the main cylinder part 12 has a gently tapered surface 4 which has a large diameter on the opening side and becomes slightly smaller in diameter until it reaches the back.
8a, and when the valve mechanism 42 is inserted into the main cylinder portion 12 as described above, the stop ring 52 is automatically pressed in the centripetal direction by the tapered surface 48, and at this time, the diameter of the stop ring 52 is gradually reduce the stop ring 52.
When the stop ring 5 faces the inner circumferential groove 50, the stop ring 5
The diameter is restored by the spring action of step 2.

Next, the female member 60 will be described. The main cylinder part 62 constituting the female member 60 also has a front end cylinder part 66 with an inner diameter that allows the valve mechanism 71 described below to be inserted from the front end opening side, and a conduit 68 connected to the rear end with a small diameter opening end. 64 is an inner surface that fits into the outer surface 23 of the outer peripheral flange 22 of the male member.

Reference numeral 74 denotes a sliding valve body having a valve head 72, and a valve mechanism 7 consisting of the valve body 74, a spring 76, and a holding piece 78 for the valve body 74.
1 is inserted into the main cylinder portion 62 from the front end opening side.

The inner surface 80 on the open end side of the front end cylindrical portion 66 has a stepped portion with a different diameter, and a truncated conical surface 82 is formed at the stepped portion, and a truncated conical surface 82 is formed on the inner surface and on the outer peripheral surface. Contacting outer peripheral edge 8
The male member 10 also has a flange-like projection 86 on its inner circumferential surface, and a truncated conical valve seat 88 against which the valve head 72 of the valve body 74 comes into contact with the inner surface of the projection 86. A metal seal ring 92 having an inner peripheral edge 90 that abuts the truncated conical surface 14 is fitted, and a stop ring 94 prevents the metal seal ring 92 from coming off.

Note that 96 is an elastic sealing ring.

Next, the coupling means 100 included in the female member 60 will be explained.

The coupling means 100 consists of a first lever 102 and a second lever 104, both of which have a U-shaped cross section, and the latter 104 is rotatably pivoted to the outer periphery of the main cylindrical portion 62 of the female member 60 with a pin 106. Furthermore, an eccentric cam 108 is fixed to the rotation center of the second lever 104, and the eccentric cam 108 is fitted into a hole 110 formed at the rotation center of the first lever 102, and the second lever 102 is fixed to the rotation center of the second lever 104. It is provided so as to be separated from the lever 104 and rotate independently.

Reference numeral 112 denotes a flange formed by bending the free end opening of the first lever 102 inward, and is used when the male and female members 10, 60 are joined, that is, when the valve mechanisms 42, 71 of both the members 10, 60 are connected. Both are in a closed state, and the outer surface 2 of the flange 22 of the male member 10
3 and the front end opening inner surface 64 of the female member 60 are in a fitted state with each other, when the first lever 102 is rotated around the eccentric cam 108, the bent flange 112 of the first lever 102 is rotated.
engages the disc spring 24 on the male member 10 via the receiver 26.

Next, the operation of the above embodiment will be explained.

After the male and female members 10 and 60 are fitted into each other, the first lever 102 is first tilted to the right as shown in FIG. 2.

In this state, the bent collar portion 112 of the first lever 102 engages with the receiver 26 of the disc spring 24, and both members 10.60 are placed in a temporarily held state.

In this state, both valve mechanisms 42 and 71 are closed.

Next, as shown in FIG. 3, when the second lever 104 is tilted to the right in the figure, the eccentric cam 108 fixed to the center of rotation of the lever 104 rotates together with the second lever 104. The first lever 102 is moved back toward the left in FIG. 3, and the male member 10 is pulled toward the female member 60 until the state shown in FIG. 3B is reached. As a result, the bent flange portion 112 of the first lever 102 strongly presses the disc spring 24, and the disc spring 24
The resilient force strongly presses the male member 10 to the left in FIG.

Therefore, the front end opening of the male member 10 is completely accommodated within the front end opening of the female member 60, and at the same time, the valve head 32 of the valve body 30 presses the valve head 72 of the female member 60, causing the valve body 74 to move to the left in the figure. At the same time, the annular internal protrusion 86 of the metal seal ring 92 provided inside the female member 60
The side sliding valve 36 is moved back to the right in FIG.
, 60 are opened and communicated with each other.

On the other hand, when both members 10 and 60 are completely connected, both the inner and outer peripheral edges 90 of the metal seal ring 92,
84 is the truncated conical surface 1 of each opposing member 10, 60;
4,82.

At this time, the hardness of the metal seal ring 92 is 1 on the truncated conical surface.
4.82, the inner and outer peripheral edges 90, 84 have a truncated conical surface 1.
4 and 82 individually to perform a perfect metal sealing function.

On the other hand, if the metal seal ring 92 is softer than the material of the main cylinder members 12, 62, both the inner and outer peripheral edges 90, 84 of the metal seal ring 92 are crushed to provide a similar metal seal.

In addition, in determining the hardness of the metal seal ring 92,
The hardness of the metal seal ring 92 should be the same as that of the main cylinder portions 12, 62, or slightly smaller if the male and female members 10, 60 are attached and detached frequently. Thus, sealing is performed mainly at the surface contact portion between the metal seal ring 92 and the elastic seal ring 35 of the slide valve 36.

If both the inner and outer circumferential edges 90.84 of the metal seal ring 92 become deformed or worn and the sealing function deteriorates, all you need to do is remove the stop ring 94 and the valve body 74 will be freed. With the elastic force of 76, it can be removed very easily, and the metal seal ring 92 can be replaced very easily.

In the above-mentioned sealed state, since the bent flange 112 formed at the free end of the first lever 102 is engaged with the receiver 26, the male and female members 10 and 60, once connected, cannot be accidentally separated. Absolutely not.

The present invention has been described above based on the embodiments, but the present invention includes the following valve bodies 74, 30 and a spring 76 for closing the same valve bodies. ,38
The valve mechanism 7 includes the holding pieces 78, 40, etc. of the valve body.
It is formed with a single structure pipe body consisting of two parts: a front end cylinder part 66, 16 with an inner diameter that allows insertion of 1.42 mm, and a rear end cylinder part 70, 20 that can connect a conduit 68, 18 to a small diameter opening at the rear end. In the female member 60, a valve body 74 that slides in the axial direction within the main cylinder portion 62 is in surface contact with the valve head 72 of the valve body 74 and the inner surface of the main cylinder portion 62, and A metal seal ring 92 whose outer peripheral edge 84 abuts against the truncated conical surface 82 on the inner surface of the main cylinder part 62 and a retaining ring 94 of the metal seal ring 92 are removably fitted. A second lever 104 with an eccentric cam 108 fixed to the rotation center is pivotally mounted on the outer periphery, and a first lever 102 having a flange 112 that engages with the outer periphery of the male member 10 is pivoted on the eccentric cam 108. The male member 10 also has a fixed valve body 30 in its main cylinder portion 12 that faces the sliding valve body 74.
When the male and female members 60, 10 are not coupled, the main cylinder portion 12
The front end opening of the metal seal ring 9 is sealed, and the metal seal ring 9 is
A sliding valve body 36 is provided in pressure contact with the main cylinder portion 1.
2 is formed with a truncated conical surface 14 that comes into contact with the inner peripheral edge 90 of the metal seal ring 92 at the time of coupling, and furthermore, when the first lever 102 is tilted and then the second lever 104 is tilted, A metal seal ring 92 is interposed between the main cylinder parts 62 and 12 of the male and female members 60 and 10 on the end surface of the main cylinder part 12 that receives the pressing force of the collar part 112 of the first lever 102.
Since the spring 24 is provided to firmly press the main cylinder portions 62 and 12 together, the following effects can be achieved.

(1) First and second levers 10 as coupling means 100
2,104 and by operating the first lever 102,
First, the male and female members 60, 10 are placed in a state where they are completely prevented from separating, and then the male and female members 60, 10 are operated to separate the male and female members 60, 10.
The structure is such that the valve bodies 76 and 30 of both members 60 and 10 are opened at the same time as to ensure the integrity of the seal between 0 and 10, compared to conventional products that use an introduction method using a union nut. By operating the lever above,
Easy and perfect joining is possible, and workability in narrow spaces is extremely good.

(2) Unlike conventional products that use a union nut tightening method, there is no need to use torque regulating means such as a torque wrench, and the male and female members can be connected and separated simply by operating the first lever 102 and the second lever 104. Especially when separating, the male and female members 60, 10 can be separated by operating the first lever 102 after the valve bodies 76, 30 are closed together by operating the second lever 104. , 18 can be safely used even when there is residual fluid pressure.

(3) Both the male and female members 60, 10 have a structure in which the valve mechanisms 71, 42 are assembled from the front end opening side, and the female member 60 has a metal seal link 92, and the male member 10 has an elastic seal link 35. Since each valve mechanism has a structure that can be easily replaced, even if the valve mechanisms 71 and 42 become worn out, they can be used permanently by simply replacing specific parts.

(4) The main cylindrical parts 62, 12 of the male and female members 60, 10 are single-structure tubular bodies, and for example, the main cylindrical parts 62, 12 can be easily made by cutting. There is no need for brazing and joining, and therefore there is no need for equipment such as a drawing machine, a washing machine, a brazing machine, etc. At the same time, the number of man-hours for assembly work is reduced, and there is no need for a leakage test.

(5) The seal between the male and female members 60, 10 is a combination of metal/metal sealing and metal/rubber sealing ring, which is different from the case where a rubber sealing ring is used alone. Leakage can be completely prevented.

(6) Overall assembly work is simple, and there are fewer checkpoints for process control and quality control, so production costs can be significantly reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view showing a separated state of both male and female members constituting a pipe joint, and FIG. 1A is a cut taken along line A-A in FIG. 1. FIG. 2 is a side view showing a temporarily joined state of both male and female members, FIG. 3 is a side view showing a completely joined state of both male and female members, and FIG. FIG. 4 is a perspective view of the second lever, and FIG. 5 is a perspective view of the first lever. DESCRIPTION OF SYMBOLS 10... Male member, 12... Main cylindrical part, 14... truncated conical surface, 24... Belleville spring, 26... Receiver, 30...
・Valve body, 42... Valve mechanism, 60... Female member, 62.
... Main cylinder part, 71 ... Valve mechanism, 74 ... Valve body, 82
. . . truncated conical surface, 84 . . . outer periphery, 90 . . . inner periphery, 92 . 2 lever, 108... eccentric cam, 112... flange.

Claims (1)

[Claims] 1. The main cylindrical portion of both male and female members has an inner diameter that allows insertion of the following valve body, a valve mechanism including the valve body closing spring, the valve body retaining piece, etc. from the front end opening side, and a rear end cylindrical portion. The female member is formed with a single structure pipe body consisting of two parts: a rear end cylinder part that can connect a conduit to a small diameter opening at the end, and a valve body that slides in the axial direction within the main cylinder part, and a valve body that slides in the axial direction within the main cylinder part; A metal sealing surface is in contact with the valve head of the valve body and the inner surface of the main cylinder part, and the outer peripheral edge is in contact with the truncated conical surface of the inner surface of the main cylinder part, and a retaining ring of the metal seal ring is attached to the female member. It is removably fitted into the inner surface of the front end cylinder part, and on the other hand, a second lever having an eccentric cam fixed to the center of rotation is pivotally attached to the outer periphery of the main cylinder part, and the outer periphery of the male member is mounted on the eccentric cam. A first lever having a flange that engages with the male member is pivotally mounted, and the male member has a fixed valve body in its main cylindrical portion that faces the sliding valve body, and the male member has a fixed valve body that faces the sliding valve body when the male and female members are uncoupled. A sliding valve body is provided to seal the front end opening of the main cylinder part and come into pressure contact with the metal seal ring when coupled, and the outer periphery of the main cylinder part has a truncated head that comes into contact with the inner peripheral edge of the metal seal ring when coupled. forming a conical surface, and further,
When the first lever is tilted and then the second lever is tilted, a metal seal interposed between the main cylinder parts of both the male and female members is attached to the end face of the main cylinder part that receives the pressing force of the collar of the first lever. A pipe joint equipped with a spring to firmly press the rings against each other in the main cylinder.