KR20080046455A - Butterfly valve having expansible sealant - Google Patents

Abstract

A butterfly valve having an expansible sealant is provided to block a fluid flow by maintaining sealing between a valve housing and a valve disk when the valve disk is closed. A butterfly valve includes a housing, a rotary shaft(12), and a blocking member(13). The housing has a passage(F) with a circular cross section. The rotary shaft is rotatably coupled with a lower end of an inner peripheral surface of the passage by vertically passing through an upper end of an outer peripheral surface of the housing. The disk-shaped blocking member is coupled with the rotary shaft inside the passage. The butterfly valve further includes a metal sealing(17) and an expansible sealing member. The metal sealing is in contact with upper and lower ends of the rotary shaft inside the passage and coupled along an inner peripheral surface of the housing, which is perpendicular to an axial direction of the passage. The metal sealing is close to an outer peripheral surface of the blocking member. The expansible sealing member is installed along an inner peripheral surface of the meal sealing which is the closest to the outer peripheral surface of the blocking member.

Description

Butterfly valve having expansible sealant

1 is a view showing a conventional butterfly valve.

Figure 2 is a view showing that the airtight is maintained by the valve disc and the valve housing in FIG.

3 shows a butterfly valve with an inflatable seal according to the invention.

Figure 4 is a view showing that the airtight is maintained by the blocking member and the valve housing in FIG.

Figure 5 is a view showing in detail the valve housing the expansion sealing member is installed.

            <Description of Symbols for Main Parts of Drawings>

11 housing 12 rotating shaft 13 blocking member

14: sealing support plate 15: sealing fixing bolt 16: rubber sealing

17 metal sealing 18 expandable sealing member F: flow path

N: Fluid supply pipe V: Valve P: Pump

The present invention relates to a butterfly valve which is installed in a conduit for conveying a fluid and opens and closes to control a fluid flowing in the conduit.

Modern society is an urban society. The most basic precondition for the existence of a city where many people gather collectively is the supply of drinking water. The smooth supply of drinking water has become the most basic precondition for the existence of the city. It is largely based on the various pollutions brought together.

In other words, before the modern city was established, the old city was not polluted, and the groundwater such as wells was clean everywhere, and the nearby river could be used as drinking water. Except for the case, there was no big problem in the supply of drinking water.

However, with industrialization, various sewage water discharged from factories around the city and the amount of daily sewage generated from various daily necessities increases, contaminating groundwater and river water flowing in the city, and so on. It is almost impossible to find drinking water at.

Therefore, today's urban drinking water is rivers or lakes that are located some distance from the city, that is, with little or no contaminant inflow, which are collected from them, co-disinfected in the water purification plant, and then supplied to drinking water. Bar water is collected in this way, and in order to supply it as drinking water after sterilizing it, tap water pipes are required.

The water supply pipe as described above has a very long pipe length, and according to long-term use, partial replacement of pipes is required continuously due to deposition of various foreign matters contained in the water or deterioration or damage of the pipe itself.

Therefore, water supply shut-off valves are generally installed in various places of the water supply pipes for the purpose of pipe replacement and repair, and in order to prevent unnecessary water leakage when performing pipe replacement or various constructions, and to provide temporary piping as necessary. Multiple valves are coupled onto the water pipe.

By the way, when the valve coupled to the water pipe passage as described above is locked or partially open, the valve is subjected to a considerable hydraulic pressure, the aging of the valve proceeds by this hydraulic pressure.

In other words, the supply of water through the water supply pipe is made between the supply source and the demand source, which are separated by a considerable distance, and thus, a considerable amount of supply pressure is required for the water supplied from the supply source to reach the demand source while maintaining proper water pressure. It becomes

Therefore, when the valve is locked, the pressure applied to the valve is very large, and in the open state, since the wear of the contact surface is inevitable due to friction with water, the valve ages, so that the piping as well as the valve are repaired or replaced at regular intervals. Should be done.

In addition, in recent years, in addition to the above water supply pipes, large pipelines for transporting fluids, such as water pipes, oil pipelines, or gas pipes, have been installed throughout the country beyond the water supply pipes, and a large number of valves are installed in such large pipelines. As high pressure is applied like the valve installed in water supply pipe, wear due to friction with fluid is inevitable.

As described above, the role of the valve, which is essential for various large pipelines, is to block or regulate the flow of the fluid as necessary, and when the flow of the fluid is blocked, the flow of the valve must be completely blocked, and the replacement cycle It must have sufficient durability to be extended as far as possible.

1 is a view showing a conventional butterfly valve, Figure 1 is a view showing a conventional butterfly valve, Figure 2 is a view showing that the airtight is maintained by the valve disk and the valve housing in FIG.

Referring to these drawings, the conventional butterfly valve has a structure to block the flow of fluid by the valve disk (3) which is supported by the rotating shaft (2) formed through the inner peripheral surface of the valve housing (1) to rotate. .

And, both ends of the valve housing (1) is provided with a flange (F), respectively, a plurality of coupling holes (h) are formed in the edge of the flange (F) to facilitate connection with other pipes.

Looking at this in more detail, the outer circumferential surface forming the rim of the valve disk (3) rotatably coupled to the inner circumferential surface of the valve housing (1) in order to effectively maintain the airtight with the valve housing (1) rubber sealing (6) A pair of annular sealing support plates 4 are disposed on the front and rear surfaces, respectively, in order to couple the edges of the rubber sealing 6 and the valve disc 3, and the sealing fixing bolts 5 penetrate them. As a result, the sealing support plates 4 on both sides are firmly fixed.

Then, when the valve disc 3 is rotated by the handle (H) to be placed in a position to block the flow of fluid on the inner circumferential surface of the valve housing (1), in order to effectively maintain the airtight, to the rubber seal (6) A ring-shaped metal sealing 7 is fixed to the inner circumferential surface of the opposite valve housing 1 by a sealing fixing bolt 5.

Thus, the airtightness is maintained by the rubber sealing 6 in contact with the metal sealing 7, thereby effectively blocking the fluid flow in the valve housing 1.

However, in the sealing structure of the butterfly valve according to the prior art, when the knob (H) is frequently turned to frequently prevent or open the flow of fluid on the inner circumferential surface of the valve housing (1), the metal sealing (7) is frequently contacted. The outer circumferential surface of the rubber seal 6 which is operated while causing wear and tear occurs, and a gap is gradually formed between the metal seal 7 and the rubber seal 6, and the air supply field is not kept confidential, so that the rapeseed leaks into the gap. There was a problem going out.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a sealing structure of a butterfly valve that not only completely maintains the airtight between the valve housing and the valve disc, but also maintains the airtight maintained as described above for a long time.

The above object of the present invention is achieved by providing an expandable sealing member on an inner circumferential surface of a valve housing that is mated with a valve disk that is a blocking member.

The butterfly valve having an expandable sealing according to the present invention includes a housing formed with a passage having a circular cross section, a rotating shaft vertically penetrating the upper end of the outer peripheral surface of the housing and rotatably coupled to the lower end of the inner peripheral surface of the passage, and a disc coupled to the rotating shaft in the passage. A butterfly valve comprising an upper blocking member, wherein the butterfly valve meets the upper and lower ends of the rotating shaft in the flow path, is coupled along a housing inner circumferential surface perpendicular to the flow path axial direction, and the inner circumferential surface is adjacent to the outer circumferential surface of the blocking member. ; The bar is characterized by consisting of an expandable sealing member that is fixed along the inner circumferential surface of the metal sealing closest to the outer circumferential surface of the blocking member, looking at each component as follows.

The butterfly valve having an expandable sealing according to the present invention has a structure having a valve disc, ie, a blocking member, which is supported by a rotating shaft penetratingly formed on an inner circumferential surface of the valve housing, and has a blocking member, wherein both ends of the valve housing form a through hole. As the outer periphery of the both ends are provided with a flange, respectively, a plurality of coupling holes are formed in the tedrid portion of the flange to facilitate connection with other pipes.

The blocking member rotatably coupled to the rotating shaft fixedly extended to the handle is provided with a rubber seal on the outer circumferential edge thereof, and the metal sealing, which is the subject of the present invention, is provided on the inner circumferential surface of the valve housing when the blocking member is closed. An expansion sealing member is fixedly coupled along the inner circumferential surface thereof.

That is, the metal sealing meets the upper and lower ends of the rotating shaft in the flow path, is coupled along the inner circumferential surface of the housing perpendicular to the flow path axial direction, and at the same time the inner circumferential surface is fixedly installed close to the outer circumferential surface of the blocking member. It is fixed to the inner circumference of the valve housing by two sealing bolts.

The expandable sealing member is fixedly installed along the inner circumferential surface of the metal sealing, and the expandable sealing member is a hollow tube body in which the volume is expanded and contracted. A fluid such as air is provided on one side of the outer circumferential surface of the expandable sealing member. The fluid supply pipe to be supplied is installed to penetrate the side wall of the valve housing, the fluid supply pipe extending out of the side wall of the valve housing is equipped with a valve for controlling the inflow of fluid, the end of the fluid supply pipe for supplying fluid The pump is coupled.

Hereinafter, a preferred embodiment of a butterfly valve having an inflatable seal according to the present invention will be described with reference to the accompanying drawings.

3 is a view showing a butterfly valve having an inflatable seal according to the present invention.

Referring to FIG. 3, a butterfly valve having an expandable sealing according to the present invention includes a housing in which a flow path having a circular cross section passes, a rotation shaft penetrating vertically through an upper end of the outer circumferential surface of the housing, and rotatably coupled to a lower end of the inner circumferential surface of the flow passage; In the butterfly valve comprising a disk-shaped blocking member coupled to the rotating shaft therein, the housing 11 which meets the upper and lower ends of the rotating shaft 12 in the flow path (F) and is perpendicular to the flow direction (F) axis direction A metal seal ring 17 coupled along the inner circumferential surface, the inner circumferential surface proximate to the outer circumferential surface of the blocking member 13; Characterized in that it consists of an expandable sealing member 18 is fixed along the inner circumferential surface of the metal sealing 17 closest to the outer circumferential surface of the blocking member (13).

In particular, the inflatable sealing member 18 is composed of a hollow tube body in which the volume is expanded and contracted, and in order to inject a fluid such as air into the hollow tube body, one of the inflatable sealing members 18 is used. and fluid supply line (N) of the tubular with a through-connection to the side wall, the other end of said fluid supply line (N), it is preferred that a pump (P) coupled.

In addition, a valve (V) for intermitting the flow of fluid is added to the middle of the fluid supply pipe (N), so that the fluid such as air is supplied to the fluid supply pipe (N) by the pump, and the expansion sealing member at a constant pressure. When 18 is filled, it is necessary to stop the operation of the pump and to close the valve V to prevent the back flow of the fluid.

4 is a view showing that the airtight is maintained by the valve disc and the valve housing in Figure 3, Figure 5 is a view showing in detail the valve housing in which the expandable sealing member is installed.

Referring to these drawings, the butterfly valve according to the present invention, by turning the handle (H) is brought to the closing member 13 is closed position, coupled to form an arc on the outer peripheral surface of the blocking member (13) The rubber seal 16 is placed at the position closest to the valve housing 11.

At this time, there is a weak gap between the metal sealing 17 and the rubber sealing 16 coupled to the inner circumferential surface of the housing 11 by a sealing fixing bolt 15, but the blocking member 13 The expandable sealing member 18 fixed along the inner circumferential surface of the metal sealing 17 closest to the outer circumferential surface closes the gap and presses the outer circumferential surface of the rubber sealing 16 at a constant pressure, thereby expanding the sealing member ( 18) and an airtight between the rubber seal 16 is formed in a circular arc on the outer circumferential surface of the blocking member 13 is more perfect.

That is, the expansion-type sealing member 18 fixed along the inner circumferential surface of the metal sealing 17 fixed closest to the outer circumferential surface of the blocking member 13 by the sealing fixing bolt 15, the volume is expanded and contracted A hollow tube body, in particular, the tubular fluid supply pipe (N) is penetrated and connected to one side wall of the inflatable sealing member (18), the pump (P) is coupled to the other end of the fluid supply pipe (N).

And, in the middle of the fluid supply pipe (N) is added a valve (V) for intermitting the flow of the fluid, if you want to block the housing using the butterfly valve of the present invention by using the pump (P) By supplying a fluid such as air to the fluid supply pipe (N) to ensure that the expandable sealing member 18 is kept airtight with the blocking member 13, the expansion sealing member 18 has reached the proper internal pressure In the case of stopping the operation of the pump (P), by holding the valve (V) coupled in the middle of the fluid supply pipe (N), to maintain the airtight holding force of the expandable sealing member (18).

Of course, when the shutoff member 13 of the butterfly valve of the present invention does not need to maintain airtightness, the valve V may be opened to draw out all the fluid inside the expandable sealing member 18. It is possible.

Not only completely maintains the airtight between the valve housing and the valve disk as the blocking member, there is an effect that the airtight maintained as described above is maintained for a long time.

Claims (4)

A butterfly valve comprising a housing formed with a passage having a circular cross section, a rotating shaft vertically penetrating the upper end of the outer circumferential surface of the housing and rotatably coupled to the lower end of the inner circumferential surface of the passage, and a disc blocking member coupled to the rotating shaft in the passage, A metal which meets the upper and lower ends of the rotation shaft 12 in the flow path F and is coupled along the inner circumferential surface of the housing 11 perpendicular to the flow path F axial direction, and whose inner circumferential surface is close to the outer circumferential surface of the blocking member 13. Sealing 17; Butterfly valve, characterized in that consisting of the expansion sealing member (18) fixedly installed along the inner circumferential surface of the metal sealing (17) closest to the outer circumferential surface of the blocking member (13). The method of claim 1, The inflatable sealing member (18) is a butterfly valve with an inflatable seal, characterized in that the hollow tube body is expanded and contracted in volume. The method of claim 2, One side wall of the inflatable sealing member 18, the tubular fluid supply pipe (N) is penetrated and connected, the other end of the fluid supply pipe (N) is an inflatable sealing characterized in that the pump (P) is coupled Butterfly valve equipped. The method of claim 3, wherein A butterfly valve having an expandable seal, characterized in that a valve (V) is added to the middle of the fluid supply pipe (N) to control the flow of fluid.

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