JPH0336790Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a pipe joint that allows or restricts axial movement as required.

Prior Art The in-service inspection of the steam generator of a fast breeder reactor that uses liquid metal sodium as a coolant requires volumetric inspection, and the inspection device consists of a positioning device, an insertion device, and a connecting pipe between them. has been done. Since this communication pipe needs to follow the movement of the positioning device, conventionally, a pipe axial slide joint, which is a combination joint of a straight pipe and an expanded pipe, is provided in the middle.

Problems to be Solved by the Invention During the above-mentioned in-service inspection, the sensor is hydraulically fed from the insertion device side. Conventional pipe axial slide joints are simply joints that combine a straight pipe and an expanded pipe, so they receive a reaction force in the pipe axial direction due to the water pressure inside the pipe, and bending moments and pressing forces are generated at the support parts on both sides of the connecting pipe. This resulted in deformation or damage, resulting in problems such as falling off at joints and malfunction.

The present invention is an expansion pipe joint that can be expanded and contracted when no water pressure is applied, such as when moving a connecting pipe, and that prevents the joint from elongating when water pressure is applied, such as during a water pressure inspection, thereby preventing deformation or damage to the joint. The purpose is to provide

Measures to solve the problem The joint provided on the connecting pipe between the header of the steam generator and the inspection device (insertion device) can be expanded and contracted in the axial direction when the connecting pipe is moved, and the joint can be expanded and contracted in the axial direction when the connecting pipe is moved. Suppress the expansion and contraction of the joint to prevent it from elongating.

As shown in FIG. 1, the mechanism for suppressing the expansion and contraction of the joint includes a ball nut 8 that rotates due to the relative movement of the joints 1 and 4 in the tube axis direction;
An electromagnetic clutch 9 is provided to prevent rotation of the motor.

Function When positioning the header side end of a connecting pipe, etc.
When no water pressure is applied and expansion and contraction in the tube axis direction is required, the electromagnetic clutch is demagnetized to allow rotation of the ball nut, that is, expansion and contraction of the expansion pipe joint.

When applying water pressure without requiring expansion or contraction in the pipe axial direction, such as in the case of water pressure inspection, the electromagnetic clutch is energized to stop the rotation of the ball nut and prevent expansion and contraction of the telescopic pipe joint, thereby preventing damage.

Embodiment In FIG. 1, 1 is a female joint that includes an inner cylinder 2 and an outer cylinder 3, 4 is a male joint inserted between the inner cylinder 2 and the outer cylinder 3, and 5 is a female joint that is formed on the outer periphery of the male joint 4. 6 is a bearing attached to the outer circumference of the outer cylinder 3,
7 is a rotating body attached to the outside of the bearing 6;
is integrally connected to the rotating body 7 and is connected to the ball screw 5
9 is the electromagnetic clutch main body fixed to the outer cylinder 3; 10 is a clutch rotating plate that is attached to the rotating body 7 and removably engages with the electromagnetic clutch main body 9; 11 is the outer periphery of the inner cylinder 2. Surface and male joint 4
This is a gasket provided between the inner peripheral surface of the

In such a device, the female joint 1 is connected to the insertion device side communication pipe 12, and the male joint 2 is connected to the positioning device side communication pipe 13. When the positioning device is operated, the electromagnetic clutch body 9 and the clutch rotary plate 10 are separated.

When an axial force is applied to the communication pipe 13 as the positioning device moves, a rotational force acts on the ball nut 8 and rotates together with the rotating body 7, causing the female joint 1 and the male joint 2 to move relative to each other in the axial direction. Moving.

After the positioning is completed, the electromagnetic clutch main body 9 and the clutch rotation plate are connected, and the female joint 1 and the male joint 2 are integrally connected. During in-service inspections, with the electromagnetic clutch main body 9 and the clutch rotary plate 10 connected, a sensor is hydraulically fed from the insertion device side communication pipe 12, and tensile force is generated in the joints 1 and 2, causing the ball nut 8 to Rotational force is generated, but clutches 9 and 1
0 prevents rotation of the ball nut 8.

Effects of the invention When positioning the connecting pipe without applying water pressure, by opening the clutch, the pipe joint can expand and contract in the pipe axis direction, making it easy to move the connecting pipe.

When applying water pressure, such as during water pressure inspections, by fixing the clutch, the pipe joint does not extend in the pipe axis direction. Therefore, the hydraulic reaction force of the pipe joint is not transmitted to the connecting pipe, and damage to the pipe joint is prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram, partially in section, of an embodiment of the expansion pipe joint of the present invention. DESCRIPTION OF SYMBOLS 1... Female joint, 4... Male joint, 5... Ball screw, 8... Ball nut, 9... Electromagnetic clutch body, 10... Clutch rotary plate, 11... Packing.

Claims (1)

[Scope of utility model registration request] a hollow female joint having a nut rotatably attached to its tip; a male joint having a screw on its outer periphery and inserted into said female joint; It comprises a clutch member for blocking and a gasket between the female joint and the male joint, and when the clutch member is released, a ball nut rotates so that the female joint and the male joint can move in the axial direction. Expansion pipe joint.