JPS649501B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Since piping in power plants is displaced due to temperature changes, spring-type hangers are widely used to comfortably support the piping. Furthermore, vibration dampers are used to suppress sudden vibrations caused by earthquakes, etc., but vibration dampers are designed to tolerate gradual displacement of piping due to temperature changes without any problem. There are several types of vibration dampers, but those used in nuclear power plants use mechanical snubbers that handle everything mechanically to ensure safety and maintenance-free operation. As a result, many spring-type hangers and mechanical snubbers are installed at key points along long piping in nuclear power plants, but from a design standpoint, it is often necessary to install both at the same location on the piping. There is a demand for a device that can serve both purposes. The present invention meets this need.

Examples will be described with reference to the drawings. The main cylinder 1 consists of a large diameter part 1a and a small diameter part 1b, and a handle 1c is fixed to the outer end of the large diameter part. The sub cylinder 2 is inserted into and out of the main shaft small diameter portion 1b, a ball nut N is attached to the inner end, and a puller 2b is attached to the outer end lid 2a.
is fixed. The load receiving ring 3 is the main cylinder large diameter portion 1a.
It is fixed inside. The threaded rod 4 consists of a straight part 4a and a ball screw part 4b, and is rotatably supported by the load bearing ring 3 via a bearing B at the end of the straight part, and the ball screw part is screwed into a ball nut N. There is.
The threaded rod 4 is restricted from moving in the axial direction relative to the main cylinder. Therefore, due to the relative movement of main cylinder 1 and sub cylinder 2,
The threaded rod 4 can be rotated in forward and reverse directions. The weight ring 5 is fixed to the straight portion 4a. The brake wheel 6 is slidably inserted into the straight portion 4a, and a plurality of conical holes are bored on the surface facing the weight wheel 5 at corresponding positions on the same circumference, and a ball 7 is formed between the opposing conical holes. can be pinched. The weight wheel 5 and the brake wheel 6 are provided with flanges 5a and 6a at alternate ends, respectively, and a spring 8 is inserted between the flanges. The two wheels 5 and 6 are constantly urged closer together by the spring 8, and press against the ball 7. Therefore, when the weight wheel 5 turns together with the threaded rod 4, if the turning is slow, both wheels 5 and 6 turn as one, but if the turning is sudden, the static inertia of the brake wheel 6 prevents the ball 7 from moving on the slope of the conical hole. move along the
The brake wheel 6 is pushed out in the axial direction. Thereby, the brake wheel 6 and the load receiving wheel 3 come into frictional contact. The spring cylinder 9 is fixed to the lid 2a of the sub cylinder and surrounds the small diameter portion 1b of the main cylinder. The small diameter portion 1b and the spring tube 9 have flanges 1d and 9a at alternate ends, and a spring 10 is inserted between the flanges. That is, the sub cylinder 2 is always energized in the direction of entry into the main cylinder 1.

The present invention is configured as described above, and has two handles 1
c, 2b are used by connecting one to the piping and the other to the structure. In any case, it is assumed that the load on the piping is supported between the flanges of the spring cylinder 9 and the small diameter portion 1b of the main cylinder by pressing the spring 10, and the piping is stationary. Even if the piping in this state approaches and separates from both handles due to displacement due to temperature changes, the spring 10 prevents strain on the piping support. At this time, the threaded rod 4 rotates slowly, but the threaded rod 4, weight wheel 5, and brake wheel 6 rotate as one, and the displacement of the piping is not restricted. Next, let's assume that piping vibrations caused by an earthquake cause rapid reciprocating vibrations between both pulls. The threaded rod is forced to make a sharp turn against the static inertia of the weight wheel, causing frictional contact between the brake wheel and the load receiving wheel as described above. That is, by the inertial resistance and frictional resistance described above, vibration damping is performed appropriately for each stroke of reciprocating vibration. This device also effectively acts on unidirectional reaction forces. For example, if a part of the piping breaks and a shocking unidirectional reaction force is applied between the two pullers due to the ejected steam, the shock at the time of ejection is first cushioned by a sudden turn of the threaded rod, and then the There is a natural transition to continuous support by the spring 10.

As described above, the present invention is characterized in that a spring balancer and a mechanical snubber are organically combined, and a single device serves three functions.This makes it possible to reduce the number of support points for piping. Piping design and turning can be facilitated.

[Brief explanation of drawings]

The figure is a cutaway front view of the present invention. 1... Main cylinder, 1a... Large diameter part, 1b... Small diameter part, 1c... Handle, 1d... Tsuba, 2... Sub-tube, 2
a...Lid, 2b...Handle, 3...Load receiving ring, 4
... Threaded rod, 4a ... Straight part, 4b ... Ball screw part, 5 ... Weight wheel, 5a ... Tsuba, 6 ... Brake wheel, 6a ... Tsuba, 7 ... Ball, 8 ... Spring,
9... Spring tube, 9a... Tsuba, 10... Spring, N...
...Ball nut, B...Bearing.

Claims (1)

[Claims] 1 A main cylinder consisting of a large-diameter part and a small-diameter part and equipped with a handle at the outer end of the large-diameter part, a main cylinder that is inserted into and out of the small-diameter part and equipped with a nut at the inner end, and another handle on the outer end lid. A threaded rod consisting of a secondary cylinder, a load receiving ring fixed in the large diameter part of the main cylinder, a straight part and a threaded part, rotatably supported on the centerline of the main cylinder, and screwed into the secondary cylinder nut at the threaded part. A weight ring is fixed to the straight part of the threaded rod, and the weight ring is slidably inserted into the straight part of the threaded rod, and is normally urged to approach the weight ring by an attached spring, and when the weight ring rotates rapidly, an attached pushing device is applied. A mechanical vibration damping device that also serves as a hanger, consisting of a brake ring that can make frictional contact with the load receiving wheel, and a spring tube that is fixed to the outer end cover of the sub-tube and uses an attached spring to bias the sub-tube in the direction of entry into the main cylinder.