JPS5833346Y2 - Grand packing dust sealing and removal mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gland packing debris sealing and removing mechanism applied to a valve that controls fluid flow.

Generally, a valve has a stuffing box formed in the upper part of the valve box and a gland packing inserted therein, and is configured to prevent the fluid handled within the valve from leaking to the outside through between the valve box and the valve stem. ing.

However, in such a valve, each time the valve is opened or closed, the valve stem rotates and moves up and down while slidingly contacting the gland packing, so the gland packing wears out due to friction.

In order to minimize wear on the gland packing, a lubricant may be used, but this cannot be used especially in the case of fluids that require cleanliness or ultra-low temperature fluids.

For this reason, in many cases, molded packings made of tetrafluoroethylene resin, trifluorochloride ethylene resin, etc., which have a particularly low coefficient of friction, are used.

However, no matter how good the gland packing is, it will wear out little by little due to friction with the valve stem, and gland packing debris will be generated.

Gland packing debris may be naturally removed upwards as the valve stem moves up and down, but most of it falls downwards and mixes with the fluid being handled within the valve body.

As a result, the fluid to be handled is contaminated by the gland packing debris, reducing its cleanliness.

In addition, it adheres or adheres to the valve box seat and valve body seat, resulting in an incompletely closed valve state and causing the handled fluid to leak.

This invention was devised in view of the above-mentioned problems and to solve them, and its purpose is to prevent gland packing debris generated due to friction with the valve stem from getting mixed into the handled fluid. Therefore, it is an object of the present invention to provide a gland packing debris sealing and removing mechanism that prevents a decrease in the cleanliness of the handled fluid and eliminates the cause of leakage of the handled fluid.

The gland packing debris sealing and removing mechanism of the present invention has an inner chamber formed between the valve body and the valve stem and located below the gland packing, and an outer chamber located inside the inner chamber that slides into contact with the valve stem. An annular scraper that is fitted and scrapes off ground packing debris;
An annular filter that is interposed between the scraper and the valve box to prevent the passage of gland packing debris while allowing the handling fluid to pass through, an expulsion passage that communicates the interior chamber above the filter with the outside, and an expulsion passage. It consists of an opening/closing tool for opening and closing.

The gland packing debris generated due to the friction between the gland packing and the valve stem falls onto the filter in the inner chamber, and the gland packing debris adhering to the valve stem is also scraped off by the scraper and falls onto the filter. .

This prevents gland packing debris from getting mixed into the fluid being handled.

When the opening/closing device installed in the removal path is opened, the handled fluid passes through the filter, enters the inner chamber, and is discharged to the outside via the removal path, so that the gland packing debris accumulated on the filter due to the handled fluid is removed from the outside. be excluded from

According to the present invention, since gland packing debris generated due to friction with the valve stem is prevented from being mixed into the handled fluid, the handled fluid will not be contaminated and its cleanliness will not deteriorate.

Moreover, it is possible to prevent gland packing debris from adhering or adhering to the valve box seat or valve body seat, resulting in an incomplete valve closing state, and to eliminate the cause of leakage of the handled fluid.

Furthermore, according to the present invention, the gland packing debris can be discharged to the outside simply by opening the opening/closing device, which makes cleaning extremely easy and prevents the gland packing debris sealing function from being degraded due to too much gland packing debris accumulating. I can't wait to invite you.

However, since the scraper T is used to scrape off the gland packing debris adhering to the valve stem, it does not interfere with the rotation or elevation of the valve stem, and all the gland packing debris can be easily removed. I can do it.

Since the scraper is provided in the valve box via the filter, no new member is required to support the scraper, and the structure is simplified accordingly.

Embodiments of the present invention will be described below based on the drawings.

The drawing is a longitudinal sectional view showing a gland packing debris sealing and removing mechanism according to an embodiment of the present invention.

In the figure, 1 is the valve box body, and 2 is the valve box lid, which together constitute the valve box.

3 is a valve stem, 4 is a packing ring, and 5 is a gland packing.

Although the lower parts of the valve body 1 and the valve stem 3 are not shown, a valve hole and a valve seat are provided in the lower central part of the valve body 1, and an inlet hole and an outlet hole are provided on both sides.

Further, a valve body (not shown) is fixed below the valve stem 3.

Above the valve box lid 2 and valve stem 3, there is a cap nut and a handle (
(not shown), etc. are provided, and the gland packing 5 is pressed downward by a packing presser (not shown).

A threaded portion is provided between the valve stem 3 and the valve box (valve box body 1 or valve box lid 2), and when the handle is turned, the valve stem 3 rotates and moves up and down.

The gland packing dust sealing and removing mechanism is characterized in that a scraper 6, a filter 7, etc. are newly installed in the inner chamber A surrounding the valve stem, and a removal passage 12 communicating with the inner chamber A is added.

The scraper 6 has an annular shape and is located in the inner chamber A, surrounding the valve stem 3 and provided in sliding contact therewith.

The scraper 6 has the function of stripping off gland packing debris adhering to the valve stem 3.

The filter 7 has an annular shape, is provided between the scraper 6 and the valve box, and supports the scraper 6.

The filter 7 has a mesh that is thinner than that of the ground packing waste and does not allow it to pass through.

On the contrary, the handling fluid is allowed to pass through.

8 is a filter retaining ring, and 9 is a retaining ring.

These are for fixing the filter 7 to the valve box.

The exclusion path 12 is newly provided on the side of the valve box cover 2.

That is, a raised part 13 is formed on the valve box lid 2, and a discharge passage 12 is bored in the raised part 13.

The end of the removal path 12 becomes a female thread 11, into which a plug 10, which is an opening/closing tool, is detachably provided.

The operation of the above configuration will be explained.

Assume that the gland packing 5 is worn out due to friction with the valve stem 3.

The gland packing debris travels along the valve stem 3, or the valve stem 3
The filter leaves the filter and falls onto the filter 7.

On the other hand, the gland packing debris adhering to the valve stem 3 is scraped off by the scraper 6 and dropped into the filter 7.

In any case, the gland packing debris is blocked by the filter 7 and does not fall below this.

Therefore, the handled fluid is not contaminated by gland packing debris.

To discharge the gland packing debris, it is sufficient to remove and open the plug 10, which is an opening/closing tool.

The high-temperature handled fluid in the valve box passes through the filter 7 and enters the inner chamber A, blowing up gland packing debris and discharging it into the removal path 1.
It gushes out from 2.

Gland packing debris can be removed to the outside in a short amount of time.

After this, the plug 10 is tightened again.

Note that a valve 14 may be provided as the opening/closing device instead of the plug 10.

Easier to open and close than plugs.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing a gland packing debris removal mechanism according to an embodiment of the present invention. 1 is the valve box body, 2 is the valve box cover body, 3 is the valve stem, 5 is the gland packing, 6 is the scraper, 7 is the filter, 10 is the plug, 12 is the exclusion path, 14 is the valve, and A is the inner chamber.

Claims (1)

[Scope of utility model registration request] an inner chamber formed between the valve body and the valve stem and located below the gland packing, and an annular scraper located inside the inner chamber and fitted onto the outside to make sliding contact with the valve stem and scraping off gland packing debris. , an annular filter interposed between the scraper and the valve box that blocks the passage of gland packing debris and allows the passage of handled fluid; an expulsion path that communicates the interior chamber above the filter with the outside; A gland packing debris sealing and removing mechanism characterized by comprising an opening/closing tool for opening and closing a passage.