JPH0639880Y2 - Compressor intake / exhaust valve sliding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a compressor intake / exhaust valve sliding device, and more particularly to a compression device capable of accurately sliding the compressor intake / exhaust valve in a short time. The present invention relates to a machine suction and discharge valve sliding device.

“Prior Art” Generally, it is provided on the intake side or the discharge side of a compressor (hereinafter, referred to as BOG compressor) that pressurizes a gas (BOG) that is naturally vaporized in a liquefied natural gas (LNG) tank to a predetermined supply pressure. The valve plate of the valve (hereinafter referred to as intake / exhaust valve) is formed in a flat plate shape having a diameter of, for example, about 200 to 300 mm. The valve plate is
As it wears over the time of use, its flatness may decrease and gas leakage may occur.Therefore, it is periodically disassembled and inspected, and sliding is performed to restore the flatness of the valve plate if necessary. Done.

Conventionally, this valve plate sliding has a special valve plate shape,
Further, since the seat surface of the valve is large, it is performed manually by an expert.

[Problems to be solved by the invention] For this reason, the work efficiency is low, and the accuracy of the sliding and the working time vary depending on the skill level of the worker.

The present invention has been made in view of the above circumstances, and provides a BOG compressor intake / exhaust valve sliding device capable of accurately sliding the BOG compressor intake / exhaust valve in a short time. To aim.

[Means for Solving the Problem] In order to achieve the above object, the BOG compressor suction / discharge valve sliding device according to the present invention has a valve plate receiver fixed on a mount and a valve plate on the valve plate receiver. A valve fixing device for fixing the valve plate, a sliding plate mounted on the valve plate fixed to the valve plate receiver, and a large gear arranged on the sliding plate and rotating around the vertical central axis of the valve plate. And a free bearing supported on the lower surface of the large gear and in contact with the upper surface of the sliding plate so that it can roll freely in all directions, a plurality of bolt insertion holes penetrating the large gear in the vertical direction, and free movement in the bolt insertion holes. It is characterized in that it is provided with a bolt which is inserted into the main gear and is loosely connected to the large gear side, a small gear which meshes with the large gear, and a drive device which drives the large gear via the small gear.

[Operation] In the present invention, the valve plate is coaxially placed on the valve plate receiver and is fixed by the valve fixture. On the other hand, the sliding plate is pulled toward the large gear side until it comes into point contact with the free bearing by tightening the bolt inserted in the large gear, and is supported by the large gear. After that, the sliding plate is placed on the valve plate, the large gear and the small gear are meshed with each other to operate the drive device, and an abrasive is supplied between the valve plate and the sliding plate as needed. The large gear rotates about the vertical center axis of the valve plate receiver, but the bolts that support the sliding plate on the large gear can float within the bolt insertion holes, so the sliding plate is random within the range where the bolt can move. Therefore, the upper surface of the valve plate becomes a flat surface, and the sliding is performed until the contact pressure of the sliding plate on the valve plate becomes average.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional front view of a BOG compressor intake / exhaust valve sliding device according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

This device is provided with a valve plate receiver 3 fixed via a mounting plate 2 on a frame 1 made of a steel frame.

The valve plate receiver 3 is formed in a cylindrical shape with a bottom, and in order to fix the valve plate 4 to the peripheral wall 3a, bolts are screwed as valve fixing members 5 at appropriate intervals in the circumferential direction.

The installation position of the valve fixture 5 is not particularly limited, but in this embodiment, four valve fixtures 5 are provided at 90 ° intervals in the circumferential direction so that the valve plate 4 can be easily centered.

The valve plate 4 is horizontally housed in the valve plate receiver 3, and is fixed in a coaxial position with the valve plate receiver 3 by the valve fixture 5.

The sliding plate 6 placed on the upper side of the valve plate 4 fixed to the valve plate receiver 3 guides the guide plate 3b formed on the upper inner peripheral surface of the peripheral wall 3a of the valve plate receiver 3 as a guide. It is loosely connected to the large gear 7 rotating about the central axis as follows.

That is, the large gear 7 is formed with a plurality of (four in this case) bolt insertion holes 8 penetrating through the gear 7 in the vertical direction, and the bolts 9 inserted into the bolt insertion holes 8 are screwed into the sliding plate. By tightening the bolt 9, the sliding plate 6 is supported so as not to fall from the large gear 7. Further, a plurality of (four in this case) free bearings 10 are supported on the lower surface of the large gear 7, and the sliding plate 6 pulled by the bolts 9 is pulled.
Are received by these free bearings 10 in a point contact manner.

In addition, a groove having a spiral shape, a radial shape, or a combination thereof is formed on the lower surface of the sliding plate 6 in order to retain the abrasive as necessary.

The large gear 7 can be inserted into and removed from the valve plate receiver 3 from above, and is engaged with the small gear 11 supported by the mounting plate 2 in a state of being fitted to the valve plate receiver 3 having the valve plate 4 mounted thereon. There is.

The small gear 11 is directly connected and fixed to an output shaft 13 of a drive device 12 which is an air motor fixed to the lower surface of the mounting plate 2.

The large gear 7 is formed integrally with a weight 14 for bringing the sliding plate 6 into contact with the valve plate 4 with an appropriate contact pressure.

Further, valve stem insertion holes 16 and 17 are formed at the central portions of the sliding plate 6 and the large gear 7 in order to eliminate interference with the valve stem 15 connected to the valve plate 4.

In addition, as shown in FIG. 2, the peripheral wall 3a of the valve plate receiver 3 is provided with a restrictor 18 that elastically restricts the moving region of the sliding plate 6 to a certain level or less.

As shown in FIG. 3, the restrictor 18 is provided with a peripheral wall of the valve plate receiver 3.
A spring 18b and a spring receiver 18 are provided in a casing 18a screwed to the 3a.
c and the plunger 18d connected to the spring receiver 18c via the screw rod 18e are brought into contact with the peripheral surface of the sliding plate 6. The maximum amount of advance of the plunger 18d from the peripheral wall 3a can be adjusted by rotating a screw rod 18e threaded in the spring receiver 18c to move it back and forth.

In this BOG compressor intake / exhaust valve sliding device, the valve plate 4 is placed on the valve plate receiver 3 and fixed at the coaxial center position by the valve fixture 5, and then the sliding plate 6 and the large gear 7 are attached to the valve plate 4 When mounted on it and actuating the drive device 12, the large gear 7 rotates about the longitudinal central axis of the valve plate receiver 3. The rotation of the large gear 7 is transmitted to the sliding plate 6 via the bolt 9 and the free bearing 10, but since the bolt 9 supporting the sliding plate 6 on the large gear 7 can move freely in the bolt insertion hole 8, The sliding plate 6 rotates while being eccentrically randomly within the range where the bolt 9 can move. Then, the upper surface of the valve plate 4 becomes a flat surface and the valve plate 4
The sliding is performed until the contact pressure of the sliding plate 6 to the average becomes uniform. As can be seen from FIG. 2, the outer diameter of the sliding plate 6 is
It is formed in a generally triangular shape, and the screw rod 18e of the limiter 18 is pressed against the outer periphery of the sliding plate 6 by the spring 18b and abuts on it. The limiter 18 is arranged at a position dividing the circumference into two equal parts. Since the outer diameter of the sliding plate 6 is formed in a generally triangular shape as a result of being formed, the sliding plate 6 is sufficiently loosened so that the upper surface of the valve plate 4 is slid evenly.

The rotation direction of the drive device 12 is constant,
The air circuit is switched by a solenoid valve at appropriate intervals to switch between forward and reverse rotation.

Further, the sliding work may be performed for a time set empirically, and the work time may be automatically controlled by, for example, a timer.

Table 1 compares the time required for sliding one valve and the polishing accuracy with the conventional manual work.
Immediately, the working time could be shortened by about 60%, and the polishing accuracy could be finished with such high accuracy that no rework was required.

[Advantage of the Invention] As described above, according to the present invention, the sliding plate is randomly eccentrically rotated while the sliding plate is brought into uniform contact with the valve plate at an appropriate pressure. The plates can be slid together.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a BOG compressor intake / exhaust valve sliding device according to an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a vertical sectional side view of a restrictor thereof. 1 ... Mounting base 2 ... Mounting plate 3 ... Valve plate receiver 4 ... Valve plate 5 ... Valve fixture 6 ... Mating plate 7 ... Large gear 8 ... Bolt insertion hole 9 ... Bolt 10 ... Free Bearing 11 …… Small gear 12 …… Drive device 13 …… Output shaft 14 …… Weight (Large gear) 15 …… Valve handle 16 …… Valve handle insertion hole 17 …… Valve handle insertion hole 18 …… Limiter

Claims (1)

[Scope of utility model registration request] 1. A valve plate receiver 3 fixed on a pedestal 1, a valve fixture 5 for fixing a valve plate 4 on the valve plate receiver 3, and a valve plate receiver 3
Sliding plate 6 placed on the upper side of the valve plate 4 fixed to the, the large gear 7 arranged on the upper side of the sliding plate 6 and rotating around the vertical center axis of the valve plate 4, and the large gear 7 integrated Formed weight
14, a free bearing 10 supported on the lower surface of the weight 14 and in contact with the upper surface of the sliding plate 6 so as to be rollable in all directions, and a plurality of bolt insertion holes 8 penetrating the weight 14 in the vertical direction.
, A bolt 9 that is movably inserted into the bolt insertion hole 8 and that connects the sliding plate 6 to the large gear 7 side in a floating manner, a small gear 11 that meshes with the large gear 7, and the large gear 7 via the small gear 11. And a drive device (12) for driving the compressor intake and discharge valve sliding device which rotates the sliding plate (6) while randomly eccentrically rotating the sliding plate (6) within a range in which the bolt (9) can freely move within the bolt insertion hole (8).