JP7296114B2 - Joint structure - Google Patents

Description

The present invention relates to a joint structure for connecting sheaths for covering wire cores of electric wires and cables under high temperature, high pressure and high humidity.

In a nuclear power plant or a thermal power plant, a large number of controllers, measuring instruments, etc. are used, and these devices are connected by power supply wires, signal wires, and the like. These cables are covered by a sheath, which is a protective cover. This sheath is a metal tubular member filled with an insulating material, and can prevent outside air from entering even in a high-pressure, high-temperature, and high-humidity atmosphere caused by an accident or the like.

JP-A-55-14375

Since the joints between these cables are not protected by a sheath, the cables are exposed to the outside air and may corrode, requiring joints to protect the joints. Patent Literature 1 discloses a connecting tube that connects a pair of sheaths containing conductors. The end of the connecting pipe and the annular body (protrusion) fitted to the outer peripheral surface of the sheath are welded together, and a gasket is interposed between the outer peripheral surface of the sheath and the inner peripheral surface of the connecting pipe.

If the method described in Patent Document 1 is used with respect to the joint of the connecting portion of the sheath, when the joint is removed, it cannot be reattached, and the entire joint must be replaced. In regular inspections, etc., after removing the joint, the connection state of the cable is checked, and the joint is installed again. desirable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint structure capable of protecting a cable even under high temperature, high pressure, and high humidity, preventing disconnection of the cable, etc., and protecting a sheath which can be easily attached and detached.

The present invention (1) is a joint structure for connecting cables respectively enclosed in a first sheath and a second sheath, the joint structure comprising a tubular first joint member and a tubular second 2 joint member, the first sheath inserted into the first joint member and airtightly joined to the first joint member, and the first sheath inserted into the second joint member and airtightly joined to the second joint member The joined second sheath, an intermediate cylindrical body provided between the first sheath and the second sheath, and an annular gasket interposed between the butting end surfaces of the first and second joint members. and screw means for connecting the first and second joint members, wherein the first sheath and the intermediate tubular body and the intermediate tubular body and the second sheath are engaged, and the first sheath and the second sheath are engaged with each other. and the second sheath are arranged so as not to rotate relative to each other.

In the present invention (1), the first sheath is airtightly joined to the first joint member, the second sheath is airtightly joined to the second joint member, and the first joint member and the second joint member have abutting end faces. Since the annular gasket interposed in the sheath isolates it from the external environment, the inside of the sheath is not exposed even in a high-temperature, high-pressure, and high-humidity environment.

Further, in the joint structure of the present invention (1), an intermediate tubular body is provided between the first sheath and the second sheath, and the first sheath and the intermediate tubular body, and the intermediate tubular body and the second tubular body are provided. Since the sheath is engaged with the first sheath and the second sheath so as not to rotate relative to each other, the sheath will not be twisted even if the nut is rotated when connecting the joint. Since the pair of sheaths do not rotate relative to each other, the cables inside the sheaths will not be cut.

The present invention (2) is a joint structure for connecting cables respectively enclosed in a first sheath and a second sheath, the joint structure comprising a tubular first joint member and a tubular second 2 joint member, the first sheath into which the first sheath is inserted to be airtightly joined to the first sheath, and the first joint member to be inserted into the first joint member and airtightly joined to the first joint member an adapter; and a second adapter into which the second sheath is inserted and airtightly joined with the second sheath, and inserted into the second joint member and airtightly joined with the second joint member. , an intermediate cylindrical body provided between the first adapter and the second adapter, an annular gasket interposed between the abutting end surfaces of the first and second joint members, and the first and second joints screw means for connecting members, wherein the first adapter and the intermediate tubular body and the intermediate tubular body and the second adapter are engaged, and the first sheath and the second sheath are engaged with each other; It is designed so as not to rotate relative to each other.

In the present invention (2), the first adapter is interposed between the first joint member and the first sheath, and the first joint member and the first adapter are airtightly joined. A second adapter is interposed between the second joint member and the second sheath, and the second joint member and the second adapter are airtightly joined. Furthermore, since the first joint member and the second joint member are isolated from the external environment by the thread means that connects the annular gasket and the first and second joint members, the connecting portion of the sheath is exposed to high temperature and heat. No exposure to high pressure and high humidity environments.

Further, in the joint structure of the present invention (2), an intermediate tubular body is provided between the first adapter and the second adapter, and the first adapter and the intermediate tubular body, and the intermediate tubular body and the second adapter are provided. Since the adapter is engaged with the first sheath and the second sheath so as not to rotate relative to each other, the sheath is not twisted even if the nut is rotated when the joint is connected. Since the pair of sheaths do not rotate relative to each other, the cables are not cut.

In the present invention (2), since the first adapter and the second adapter are provided, even if the outer diameter of the sheath and the inner diameter of the joint member are not in a dimensional relationship that allows airtight joining, these adapters can be used. By interposing this adapter, there is no need to prepare a new joint member.

According to the present invention (3), the intermediate cylindrical body has a protrusion or a notch formed at an end thereof, and the protrusion or the notch is the first and the first end facing the end of the intermediate cylindrical body. The joint structure of the present invention (1) is characterized in that it is engaged with notches or projections formed at the ends of two sheaths, respectively. Since the intermediate tubular body and the end of the sheath are engaged with the protrusion and the notch, the first sheath and the second sheath do not rotate relative to each other.

In the present invention (4), the intermediate cylindrical body has a protrusion or a notch formed at an end thereof, and the protrusion or the notch is the first and the first end facing the end of the intermediate cylindrical body. 2. The joint structure of the present invention (2) is characterized by being engaged with notches or projections formed at the ends of the adapter, respectively. Since the intermediate tubular body and the end of the adapter are engaged with the protrusion and the notch, relative rotational movement between the first sheath and the second sheath is prevented.

In the present invention (5), the intermediate tubular body includes a tubular first cover member housed in the first joint member, a tubular second cover member housed in the second joint member, and both covers. According to the present invention (1) to ( 4) is any one joint structure.

The intermediate tubular body includes a tubular first cover member housed in the first joint member, a tubular second cover member housed in the second joint member, and a tubular body interposed between the two cover members. Since the first cover member and the insert and the second cover member and the insert are engaged, relative rotational movement between the first sheath and the second sheath is possible. do not have. In addition, when a male connector and a female connector are used for connecting cables in the sheath, the insert can cover the connecting portions of both connectors, which facilitates the sheath connecting work.

According to the joint structure of the present invention, the sheath can be easily connected even under high temperature, high pressure, and high humidity, and the sheath is not twisted during the connection.

Fig. 3 shows a partial cross-sectional view of a joint structure in which the sheath is directly and airtightly joined to the joint member; Fig. 10 shows a partial cross-sectional view of a fitting structure in which the sheath is hermetically joined to the adapter and the adapter is hermetically joined to the fitting member; Fig. 2 shows a state in which a pair of cover members and a pair of sheaths are connected by a connector; Fig. 3 shows a top, cross-sectional and side view of the insert;

Embodiments of the present invention will be described below with reference to the drawings. In the following description, "up and down" refers to the top and bottom of the drawing. This "up and down" is for convenience, and when installed, it may be upside down or horizontal.

FIG. 1 shows a joint structure 1 intended to connect a first sheath 40 and a second sheath 50 . The first sheath 40 and the second sheath 50 are metal tubes, respectively, through which cables 61 and 71 are respectively inserted. The cable 61 is connected to the male connector 62 at the end exposed from the first sheath, the cable 71 is connected to the female connector 72 at the end exposed from the second sheath 50, and the connector pins 64 of the male connector 62 are connected. are inserted into the connector pin holes 74 of the female connector 72, and the cables 61 and 71 are electrically connected. The joint structure 1 is formed by connecting the first joint member 10 connected to the first sheath 40 and the second connection member 20 connected to the second sheath 50 .

The first joint member 10 has a through hole into which the first sheath 40 is inserted. A stepped portion is provided in the through-hole and abuts against the stepped portion provided on the first sheath 40 to prevent further insertion of the first joint member. The edge of the first sheath through-hole end and the outer periphery of the first sheath 40 are welded over the entire circumference by a welding portion 42 to be airtightly joined. Similarly, the second joint member 20 has a through hole into which the second sheath 50 is inserted. A stepped portion is provided in the through hole and the second sheath 50 abuts against it to prevent further insertion of the first joint member. A weld portion 52 welds the entire circumference between the peripheral edge of the through-hole end portion and the outer circumference of the first sheath 40 for airtight joining. The method of airtight joining is not limited to welding, and various methods such as bonding, brazing, methods using ultrasonic fusion, and mechanical methods using gaskets or compression rings can be used.

A metallic annular gasket 11 is interposed between the opposing end surfaces of the first joint member 10 and the second joint member 20, thereby maintaining airtightness between the first joint member 10 and the second joint member 20. . The annular gasket 11 is held by a retainer 12 on one of the joint members, and by tightening the screw means 30 screwed into the second joint member 20 from the first joint member 10 side, the first joint member 10 and the second joint member are separated. A force is applied in the direction in which the member 20 approaches and is pressed. The gasket pressing surfaces of the first joint member 10 and the second joint member 20 are each provided with an annular seal projection, and a dent corresponding to the seal projection is formed in the gasket when tightening is completed. A sliding member 13 is provided between the screw means 30 of the second joint member 20 and the first joint member 10 to prevent the first joint member 10 from rotating (co-rotating) together with the tightening of the screw means 30 . is sandwiched. A pure ring is used as the sliding member 13, but it is also possible to use a thrust ball bearing instead.

The first cover member 60 and the second cover member 70 have a cylindrical shape, are divided into halves, and are arranged in the through hole in the first joint member 10 and the through hole in the second joint member 20, respectively. Protrusions 63a and 73a protrude horizontally outward from the outer ends of the respective cover members. 41 and 51 are engaged. Since the cover member is divided in half, it is possible to easily engage these protrusions and notches during assembly. Protrusions 63b and 73b protrude horizontally inward from the inner ends of the respective cover members. It engages notches 81 formed at both ends of a cylindrical insert 80 which is recessed. Due to these engagements, the first sheath 40 and the second sheath 50 do not undergo relative rotational motion.

FIG. 2 is a joint having a joint construction similar to that of FIG. Description of the same points as in FIG. 1 is partially omitted. 1 in that a first adapter 90 is interposed between the first sheath 40 and the first joint member 10, and a second adapter 100 is interposed between the second sheath 50 and the second joint member 20. is that By interposing such an adapter, even if the size of the sheath varies in various ways, it can be adapted to the existing joint member, so that it is possible to cope with it without increasing the types of joint members. In addition, since the welding position between the sheath and the adapter can be changed, it is possible to connect cables with various lengths exposed from the sheath. The weld 42 between the sheath 40 and the first adapter 90 , the weld 52 between the sheath 50 and the second adapter 100 , the weld 92 between the first adapter 90 and the first joint member 10 , the second The adapter 100 and the second joint member 20 are airtightly joined by a welded portion 102 .

The protrusions 63a, 73a of the first cover member 60 and the second cover member 70 are engaged with notches 91 and 101 formed in the first adapter 90 and the second adapter 100, respectively. The engagement relationship of the first adapter 90, the first cover member 60, the insert 80, the second cover member 70, the second adapter 100 and the presence of the welds 42, 92, 102 and 52 allow the first sheath 40 and the second The sheath 50 does not rotate relative to each other.

FIG. 3 shows how the first sheath 40 and the second sheath 50 are connected. Cables 61 and 71 extend inward from the ends of the first sheath 40 and the second sheath 50, respectively, and the cables 61 and 71 are connected to male connectors 62 and female connectors 72, respectively. The connector pins 64 of the male connector 62 are fitted into the connector pin holes 74 so that the cables 61 and 71 are electrically connected.

4 shows a cross-sectional view (a), a top view (b) and a side view (C) of the insert 80. FIG. Notches 81 are formed in the upper surfaces of both ends.

According to the joint structure of the present invention, the cable at the sheath connection can be protected even under high temperature, high pressure, and high humidity, and the sheath will not be twisted during connection.

1: Joint 10: First Joint Member 11: Annular Gasket 12: Retainer 13: Pure Ring 20: Second Joint Member 30: Screw Means 40: First Sheath 41: Notch 42: Weld Portion 50: Second Sheath 51: Notch 52: Welding portion 60: First cover member 61: Cable 62: Male connector 63a: Projection 63b: Projection 64: Connector pin 70: Second cover member 71: Cable 72: Female connector 73a: Projection 73b: Projection 74: Connector pin hole 80: Insert 81: Notch 90: First adapter 91: Notch 92: Welding portion 100: Second adapter 101: Notch 102: Welding portion

Claims (5)

A joint structure for connecting cables respectively enclosed in a first sheath and a second sheath,
The joint structure is
a cylindrical first joint member;
a cylindrical second joint member;
the first sheath inserted into the first joint member and airtightly joined to the first joint member;
the second sheath inserted into the second joint member and airtightly joined to the second joint member;
an intermediate tubular body provided between the first sheath and the second sheath;
an annular gasket interposed between the abutting end surfaces of the first and second joint members;
screw means connecting the first and second joint members;
The first sheath and the intermediate tubular body, and the intermediate tubular body and the second sheath are engaged with each other so that the first sheath and the second sheath do not rotate relative to each other. and joint structure. A joint structure for connecting cables respectively enclosed in a first sheath and a second sheath,
The joint structure is
a cylindrical first joint member;
a cylindrical second joint member;
a first adapter into which the first sheath is inserted and airtightly joined with the first sheath, and inserted into the first joint member and airtightly joined with the first joint member;
a second adapter into which the second sheath is inserted and airtightly joined with the second sheath, and inserted into the second joint member and airtightly joined with the second joint member;
an intermediate cylindrical body provided between the first adapter and the second adapter;
an annular gasket interposed between the abutting end surfaces of the first and second joint members;
screw means connecting the first and second joint members;
The first adapter and the intermediate tubular body and the intermediate tubular body and the second adapter are engaged so that the first sheath and the second sheath are prevented from rotating relative to each other. and joint structure. The intermediate tubular body has a protrusion or a notch formed at one end thereof, and the protrusion or notch is formed at the ends of the first and second sheaths facing the end of the intermediate tubular body. 2. The joint structure according to claim 1, wherein the joint structure is engaged with a cutout or protrusion, respectively. The intermediate cylindrical body has a protrusion or a notch formed at one end, and the protrusion or notch is formed at the end of each of the first and second adapters facing the end of the intermediate cylindrical body. 3. The joint structure according to claim 2, wherein the joint structure is engaged with a cutout or protrusion, respectively. The intermediate tubular body is interposed between a tubular first cover member housed in the first joint member, a tubular second cover member housed in the second joint member, and both cover members. 5. An insert according to any one of claims 1 to 4, comprising a tubular insert, wherein said first cover member and said insert and said second cover member and said insert are engaged. joint structure.

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