JPH0725501Y2 - Valve rod lubricator for external screw type opening / closing table - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an oil supply device for automatically supplying oil to a valve rod in an external screw type opening / closing table, such as a valve rod of a gate valve.

[Prior Art] For example, a smooth opening / closing operation of a gate valve installed in a waterway connecting a reservoir of a sewage treatment plant and arranged at the boundary between a reservoir and a discharge channel is ensured, and Lubricating oil (eg, grease) is regularly applied to the male screw portion in order to prevent the male screw portion from rusting.

[Problems to be solved by the invention] However, since the conventional lubricating oil application work is performed manually by the worker ascending and descending along the valve rod, workability is poor and improvement in work efficiency cannot be expected. . In addition, the lubricating oil applied to the male thread portion of the valve rod does not effectively enter the threaded portion between the male thread portion and the female thread top, and most of it protrudes into the axial end surface of the female thread top. Therefore, there is a problem that lubrication of the screwed portion between the male screw portion and the female screw top is insufficient.

The present invention has been made in view of the above circumstances, and improves the working efficiency by automating the lubrication and prevents the lubricant from protruding so that the male screw portion and the female screw top are properly screwed together. An object of the present invention is to provide a valve rod lubrication device for an external screw type opening / closing table that can refuel and improve lubricity.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is to screw a male thread portion of a valve rod into an internal thread top, and rotate the female thread top in the forward and reverse directions so that the valve rod has a predetermined stroke. In an external screw type opening / closing table that reciprocates by a certain amount to open and close the valve element, an axial oil feed passage is formed that opens the stroke start end side of the valve rod, and at this oil feed passage and at least the stroke start end of the valve rod. A radial oil passage that connects the female threaded top and the male threaded portion that is screwed is formed, and the stroke starting end is located near the stroke starting end of the valve rod, facing the stroke starting end side end of the valve rod. A pump device is arranged which expands and contracts in the axial direction by reciprocal movement over and compresses the lubricating oil when the contraction occurs.

[Operation] According to the present invention, after the valve rod has moved from the stroke start end corresponding to the fully open position of the valve body to the stroke end end corresponding to the fully closed position of the valve body or to the middle of the stroke of the intermediate opening, the stroke start end is moved. At the time of the return movement to, the stroke start end side pushes the pump device to reduce it by moving from the vicinity of the stroke start end to the stroke start end, and the lubricating oil is discharged and pumped to the oil feed passage.

The lubricating oil that has been pressure-fed to the oil feed passage is automatically fed to the male screw portion that is screwed into the female thread top at the stroke start end of the valve rod through the oil passage.

By the movement of the valve rod from the stroke start end to the vicinity of the stroke start end in the forward movement, the pump device extends and prepares for the next oil supply.

be able to.

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

FIG. 1 is a schematic front view of a gate valve to which the present invention is applied and an elevating and lowering mechanism thereof. In the figure, a gate valve (gate) 1 is hung on a valve rod 2 and a guide 3 is arranged so that it can ascend and descend. Has been done.

The valve rod 2 penetrates the base 4 and a stand 5 provided upright on the base 4, and is inserted into a well-known external screw type opening / closing base 6 arranged on the upper side of the stand 5 and screwed into a female screw top 7. The valve rod cover 9 is connected to the valve rod cover 9 and is provided upright on the outer screw type opening / closing table 6 so as to be lifted up / down by forward / reverse rotation of the operation handle 8, for example. Facing inside.

At the upper end of the valve stem cover 9, the pump device is concentric with the valve stem 2.
10 are arranged. The pump device 10 is, for example, as shown in FIGS. 2 and 3, a pump main body 10A made of an axially expandable and contractible bellows, and a lubricating oil (grease) reservoir provided in communication with an upper portion of the pump main body 10A. It is composed of a tank 10B, and an oil absorption valve 10a that is closed when the pump main part 10A is contracted is provided at the oil absorption port of the pump main part 10A, and the discharge port is always closed by being urged by a spring (not shown). The oil discharge valve 10b is provided.

An axial oil feed passage 2A is formed along the axis of the valve rod 2 and opens on the stroke start end side (upper end side) corresponding to the fully opened position of the gate valve 1. The oil feed passage 2A and the male screw portion 2a are formed. A plurality of oil passages 2B in the radial direction that communicate with and are formed. These plural oil passages 2B are formed at the stroke start end of the valve rod 2 corresponding to the fully opened position where the gate valve 1 in FIG.
As shown in the figure, the external thread 2a that is screwed into the internal thread top 7
Are formed radially in the region H of FIG.

Further, a valve opening head 2C that can push up and open the oil discharge valve 10b when the pump body 10A of the pump device 10 is inserted into the discharge port is attached to the upper end of the valve rod 2.

With such a configuration, the gate valve 1 returns from the stroke end of the valve rod 2 in the fully closed position shown by the solid line in FIG. 1 to the stroke start end shown by the phantom line by the forward rotation of the operating handle 7. When moving, the valve opening head 1C at the upper end of the valve rod 2 is inserted into the discharge port of the pump body 10A by moving from the vicinity of the stroke start end to the stroke start end, pushing up the oil discharge valve 10b and opening the pump body part. Press 10A upward to reduce it. In this case, the pushing force acts on the lubricating oil inside the pump body 10A, and the oil suction valve 10a
Since the valve is opened, the lubricating oil is discharged from the discharge port
2A is pressure-fed, and the oil is supplied to the male screw portion 2a of the region H screwed with the female screw top 7 through the plurality of oil passages 2B, that is, the screwed portion of the male screw portion 2a and the female screw top 7.

When the gate valve 1 moves from the stroke start end of the fully open position shown by the phantom line to the stroke end end or the intermediate opening position of the fully closed position shown by the solid line by the reverse rotation of the operation handle 7, the stroke starts from the stroke start end of the valve rod 2. The upward pressing force of the pump main body 10A is gradually reduced by the movement to the vicinity of the start end, so that the pump main body 10A elastically expands and returns.

In this case, the pressure inside the pump body 10A drops and the oil absorption valve 1
Since the valve 0b is opened, the lubricating oil in the lubricating oil storage tank 10B is sucked and replenished into the pump body 10A from the oil suction port. Also,
When the valve opening head 1C is separated from the discharge port of the pump body 10A, the oil discharge valve 10b is opened to prepare for the next oil supply.

The lubricating oil supplied to the threaded portion between the male screw portion 2a and the female screw top 7 is applied to the male screw portion 2a above the area H as the valve rod 2 moves from the stroke start end to the stroke end. When the valve rod 2 moves from the stroke end to the stroke start end, the lubricating oil is applied again to the male screw portion 2a above the area H while being applied.

As described above, the refueling is automatically performed, so that the working efficiency is significantly improved as compared with the conventional lubricating oil application work that is performed while the worker is ascending and descending along the valve rod 2, and the internal thread is also increased. Since most of the lubricating oil can be properly supplied to the axial end surface of the top 7 without protruding, the lubricity of the threaded portion between the male screw portion 2a and the female screw top 7 can be enhanced.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects.

That is, when the valve rod goes back from the stroke start end corresponding to the fully open position of the valve body to the stroke end corresponding to the fully open position of the valve body or to the middle of the stroke of the intermediate opening degree, when returning to the stroke start end, the stroke By moving from the vicinity of the start end to the stroke start end, the stroke start end side presses the pump device to reduce it, discharges lubricating oil and pressure-feeds it to the oil feed passage, and through the oil passage, internal thread screwing at the stroke start end of the valve rod. Since the male thread that is screwed in with is automatically lubricated, the work efficiency is significantly improved and the female thread is greatly improved compared to the conventional lubricating oil application work that is performed while the worker is ascending and descending along the valve rod. Since most of the lubricating oil does not leak to the axial end surface of the top, the lubrication of the threaded portion between the male screw portion and the female screw top is enhanced.

Although the present invention is applied to the gate valve in the above embodiment, it is needless to say that the present invention can also be applied to other valves which are opened and closed by an external screw type opening / closing table system.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a gate valve and its opening / closing table to which the present invention is applied, FIG. 2 is an enlarged cross-sectional view of an essential part, and FIG. 3 is an enlarged cross-sectional view showing an operating state of a pump device. 1 ... Valve body (gate valve) 2 ... Valve rod 2A ... Oil passage 2B ... Oil passage 2a ... Male screw part 7 ... Female screw top 10 ... Pump device

Claims (1)

[Scope of utility model registration request] 1. A male screw portion of a valve rod is screwed into a female screw top,
In an external screw type opening / closing table for opening and closing the valve element by reciprocating the valve rod by a predetermined stroke amount by rotating the female screw top in the forward and reverse directions, an axial oil feed passage opening the stroke starting end side of the valve rod. Is formed, and a radial oil passage that connects the oil feed passage and the male threaded portion that is screwed with the female threaded top at least at the stroke start end of the valve rod is formed, and the stroke start end side of the valve rod is formed. A pump device is arranged opposite to the end face so as to expand and contract in the axial direction by reciprocating movement from the vicinity of the stroke start end of the valve rod to the stroke start end, and pump the lubricating oil to the oil feed passage when the valve is contracted. Valve rod oiling device for external screw type opening / closing table.