KR102255917B1 - Structure sealing of butterfly valve - Google Patents

Abstract

The present invention relates to a sealing structure of a butterfly valve. More particularly, the sealing structure of a butterfly valve maintains airtightness by injecting air into an air supply socket (300), so that a rubber expansion seal (200) mounted in seal grooves (101, 111) of a body (100) and a seal cover (110) expands and closely adheres to a disk (120), forms an arc-shaped convex part (230) and a concave part (121) corresponding to each other on an inner peripheral surface of the rubber expansion seal (200) and an outer peripheral surface of the disk (120) to improve airtightness as the convex part (230) is pushed into the concave part (121) during expansion and adheres closely to each other, and inserts a reinforcing material (400) into an inner central layer of the rubber expansion (seal) 200 to prevent the rubber expansion seal (200) from bursting during expansion.

Description

Sealing structure of butterfly valve {STRUCTURE SEALING OF BUTTERFLY VALVE}

The present invention relates to a sealing structure of a butterfly valve, and more particularly, as the rubber expansion seal expands, air is injected so that air is tightly adhered to the disk to maintain airtightness, and the rubber expansion seal By forming arc-shaped convex portions and concave portions corresponding to each other on the inner circumferential surface of the disk and the outer circumferential surface of the disk, when expanding, the convex portion is pushed into the concave portion and adheres to it to improve airtightness, and a reinforcing material is inserted into the inner central layer of the rubber expansion chamber. It relates to a sealing structure of a butterfly valve to prevent the rubber expansion chamber from bursting during expansion.

In general, butterfly valves are fixedly installed by assembling a valve seat to the inner fluid passage of the valve body, and screwing a disk cover to the outer side thereof, and an opening and closing disk is assembled rotatably by a rotating shaft inside the valve seat, The upper portion of the rotation shaft is connected to the actuator, and the outer surface of the opening/closing disk is separated or adhered to the inner wall of the seat by the operation of the actuator to open and close the fluid passage.

Such a conventional butterfly valve has problems such as shortening the life of the valve seat as well as effectively maintaining the airtightness of the opening and closing disk and the valve seat due to severe contact friction with the inner wall of the valve seat during the opening and closing process of the opening and closing disk. .

Therefore, in recent years, the valve seat has been manufactured to contract and expand by air. When the valve is opened, the valve seat contracts, and when the valve is closed, the valve seat expands to stably maintain the contact force with the opening and closing disk, while the valve seat Butterfly valves equipped with contraction and expansion valve seats that suppress damage or breakage due to friction of the body have been used.

As an example of the prior art, in Korean Utility Model No. 20-0290296, which is the following patent document, a valve seat is assembled into the inner fluid passage of the valve body, and a disk cover is screwed to the outside of the valve body to be fixedly installed, and the inside of the valve seat is The opening/closing disk is assembled to be rotatable by a rotating shaft, and the upper part of the rotating shaft is connected to the actuator to open and close the valve while rotating.The internal fluid passage of the valve body communicates with an air supply port connected to an air supply means not shown. An annular air passage is provided, and a seat holder formed through a plurality of air holes on the circumference and a valve seat in the form of a "C" inserted to the outside of the air passage is inserted in a state spaced apart from the opening/closing disk. A seat inflatable butterfly valve device is disclosed, characterized in that the inner wall of the valve seat is expanded by the pressure of the air supplied to the air passage and is in close contact with the disk cover and is in close contact with the opening/closing disk.

However, since the valve seat of the prior art is simply formed in a "c" shape, the strength and durability of the valve seat are structurally weak, so the valve seat is easily deformed by pressure, and the valve seat's support is weak. There was a problem that the sealing function was deteriorated as a result because it could not be firmly supported.

In particular, the valve seat of the prior art has a problem in that the expanded area easily bursts due to the pressure generated during expansion because the durability of the area expanded and contracted during the repetitive contraction and expansion process is weak. In other words, in the conventional valve seat, when air is supplied like a rubber balloon, the valve seat expands due to its own elasticity and becomes thinner and expands, so the thickness of the expansion part increases by the pressure generated during expansion, such as when a rubber balloon bursts. There was a problem that it popped easily as it became thinner.

Patent Document: Utility Model Registration No. 20-0290296 (Registration Date: 2002.09.12)

An object of the present invention was invented to solve the conventional drawbacks as described above, and when the rubber expansion chamber is contracted and expanded by air, the rubber expansion chamber is contracted to separate it from the disk when it is closed. The purpose is to provide a sealing structure of a butterfly valve that maintains airtightness by injecting air so that the rubber expansion chamber is inflated and tightly adhered to the disk.

In addition, the present invention is a sealing structure of a butterfly valve in which arc-shaped convex portions and concave portions corresponding to each other are formed on the inner circumferential surface of the rubber expansion chamber and the outer circumferential surface of the disk so that the convex portion is pushed into the concave portion during expansion and is in close contact to improve airtightness. It is to provide.

In addition, the present invention is to provide a sealing structure of a butterfly valve in which a reinforcing material is inserted in the inner central layer of the rubber expansion chamber to prevent the rubber expansion chamber from bursting due to pressure during expansion.

In order to achieve the above object, the present invention forms thread grooves concentrically on the outer surface of the body and the inner circumferential surface of the thread cover, and an expansion and contraction space is formed between the expansion and contraction blades on both sides of the thread groove of the body and the thread cover, and an arc-shaped convex portion is formed on the inner circumferential surface. The formed rubber expansion chamber is mounted to be spaced apart from the outer circumferential surface of the disk, and an air supply socket for inflating the rubber expansion chamber so that the rubber expansion chamber is in close contact with the disk when the valve is closed is installed on the seal cover, and the rubber expansion In order to correspond to the convex portion of the seal, a concave portion that is in close contact with the convex portion upon expansion is formed on the outer circumferential surface of the disk, and a reinforcing material for reinforcing strength is inserted into the inner central layer of the rubber expansion chamber.

Further, in the present invention, contact portions are formed in an arc shape on both sides of the convex portion of the rubber expansion chamber, and grooves are formed between the convex portion and the contact portions on both sides.

In addition, in the present invention, an arc-shaped convex surface is formed on the outer circumferential surface between the wings on both sides of the rubber expansion chamber.

In addition, in the present invention, semicircular support grooves and support protrusions are formed on both sides of the seal groove of the seal cover, and fixing protrusions and fixing grooves corresponding to the support grooves and the support protrusions are respectively formed inside the wings of the rubber expansion chamber. .

In addition, in the present invention, the rubber expansion chamber is made of an elastomer, and the reinforcing material is made of a fabric.

In addition, in the present invention, a plurality of grooves are formed on the inner circumferential surface of the rubber expansion chamber.

Further, in the present invention, a pin hole into which a center pin is inserted is formed in the stem assembled to the fixing part and the fixing part of the disk, and the center pin is fixed by bolting while being inserted into the fixing part and the pin hole of the stem.

In addition, in the present invention, a ball insertion hole into which a center ball is inserted is formed in the undercover fixed to the lower part of the body, and a ball insertion groove into which the center ball is inserted is formed in a stem inserted into the undercover.

Further, in the present invention, a plurality of protrusions are formed on the outer surfaces of both sides of the rubber expansion chamber, and a plurality of grooves are formed on the outer circumferential surface of the disk.

In addition, in the present invention, an air nozzle for removing foreign substances is installed on the undercover fixed to the lower part of the body by spraying air to the lower part of the flow path of the stem and the body through the air passage formed in the stem.

According to the sealing structure of the butterfly valve of the present invention, the rubber expansion chamber is mounted in the seal groove of the body and the seal cover so as to be spaced apart from the disk, and the seal cover provides air to the rubber expansion chamber when the valve is closed and expands the air. Since the supply socket is installed, when the valve is opened, the rubber expansion chamber is contracted to separate it from the disk, and when the valve is closed, the rubber expansion chamber expands and air is injected so that it closely adheres to the disk to maintain airtightness. There is an effect.

In addition, since the convex portions and concave portions corresponding to each other on the inner circumferential surface of the rubber expansion chamber and the outer circumferential surface of the disk are formed in an arc shape, when the rubber expansion chamber is expanded, the convex portion is pushed into the concave portion and closely adheres to the concave portion, thereby further improving the airtightness. There is an effect that can be.

In addition, since a reinforcing material is inserted in the inner center layer of the rubber expansion chamber to reinforce the strength of the rubber expansion chamber to improve durability, structurally, the rubber expansion chamber is prevented from bursting due to pressure when the rubber expansion chamber is expanded. There is an effect that can be done.

1 is an exemplary view showing a butterfly valve according to the present invention.
2 is a cross-sectional view taken along line A-A of FIG. 1;
Figure 3 is a cross-sectional view showing a separated state of the seal cover and the rubber expansion chamber according to the present invention.
Figure 4 is an enlarged view of the "B" part of Figure 3;
Figure 5 is an enlarged view of the "C" part of Figure 3;
Figure 6 is an enlarged view of the "D" part of Figure 3;
Figure 7 is an enlarged cross-sectional view showing a main part of the present invention.
8 is an enlarged cross-sectional view of a rubber expansion chamber according to the present invention.
9A is a cross-sectional view showing a state in which the rubber expansion chamber is expanded when the valve according to the present invention is closed.
9B is a cross-sectional view showing a state in which the rubber expansion chamber is contracted when the valve according to the present invention is opened.
9C is a cross-sectional view showing a state in which pressure is applied in an outer direction of a rubber expansion chamber and a flow of a fluid by the internal pressure of the pipe according to the present invention.
Figure 10 is an exemplary view showing another embodiment of the rubber expansion chamber according to the present invention.
11 is an exemplary view showing another embodiment of a rubber expansion chamber and a disk according to the present invention.
12A and 12B are exemplary views showing an air nozzle and an air passage for removing foreign substances according to an example of the present invention.
13A and 13B are exemplary views showing an air nozzle and an air passage for removing foreign substances according to another example of the present invention.
14A and 14B are exemplary views showing an air nozzle and an air passage for removing foreign substances according to another example of the present invention.
15 is an exemplary view showing another embodiment of the reinforcement according to the present invention.

Hereinafter, the technical configuration of the present invention will be described in detail according to the accompanying drawings.

The sealing structure of the butterfly valve according to the present invention includes a seal groove 101, 111 formed concentrically on the outer surface of the body 100 and the inner circumferential surface of the seal cover 110, as shown in FIGS. 1 to 11; A rubber expansion chamber 200 provided in the seal groove 111 so as to be spaced apart from the outer circumferential surface of the disk 120 and having an expansion and contraction space 220 formed between the wings 210 on both sides and an arc-shaped convex portion 230 formed on the inner circumferential surface; An air supply socket 300 installed on the seal cover 110 to inflate the rubber expansion chamber 200 so that the rubber expansion chamber 200 is in close contact with the outer circumferential surface of the disk 120 when the valve is closed; A concave portion 121 formed on the outer circumferential surface of the disk 120 to correspond to the convex portion 230 of the rubber expansion chamber 200 and in close contact with the convex portion 230 when expanded; It is a basic feature of the technical construction that is configured to include a reinforcing material 400 that is inserted into the inner central layer of the rubber expansion chamber 200 to reinforce strength.

Here, the butterfly valve according to the present invention is installed between the pipes and is assembled with a body 100 having a flow path formed therein, and a wrench bolt W on the outer surface of the body 100 to provide a rubber expansion chamber 200. A supporting seal cover 110, a disk 120 that is rotatably installed inside the body 100 to open and close a flow path, a stem 130 that rotates the disk 120, and the body 100 ) Consists of an undercover 140 installed in the lower part of the. At this time, the outer circumferential surface of the disk 120 is formed to be inclined with a taper whose outer diameter gradually decreases from the body 100 toward the seal cover 110, and the stem 130 is a fixing portion 120a of the disk 120 It is fixed while being inserted into the stem 130, a driving unit is connected to the stem 130, as is well known, and the lower portion of the stem 130 is fitted to the undercover 140.

According to the present invention, a ball insertion hole 141 into which a center ball B1 is inserted is formed in the undercover 140 fixed to the lower portion of the body 100 as shown in FIGS. 6 and 7, and the undercover 140 A ball insertion groove 131 into which the center ball (B1) is inserted is formed in the stem 130 fitted to the ). At this time, the center ball (B1) serves to guide the stem 130 to be fastened to the correct position. On the other hand, a ground ball (B2) contacting the undercover 140 is mounted under the stem 130 to receive the elasticity of the spring (S). At this time, the ground ball B2 serves to prevent static electricity.

On the other hand, according to the present invention, as shown in Figs. 2 and 3, the packing follower (F) supporting the packing part installed on the upper part of the stem 130 is fastened in a simple structure by one snap ring (N). At this time, conventionally, the packing follower supporting the packing part installed on the upper part of the stem was fastened in a complicated structure by a flange, a plurality of bolts, and a plurality of nuts, but in the present invention, the packing follower (F) is It is fastened in a simple structure by one snap ring (N).

According to the present invention, as shown in FIG. 7, pin holes 120b and 132 into which the center pin P is inserted into the stem 130 assembled to the fixing part 120a and the fixing part 120a of the disk 120 Each is formed, and the center pin (P) is characterized in that the pin hole (120b, 132) is fixed by fastening bolts 150 in a state of being fitted. At this time, after the center ball (B1) is seated, the center pin (P) is inserted into the pin hole (120b) (132) and fixed by fastening the bolt (150), and a plurality of wrench bolts ( When the fastening is completed by mounting 151, the disk 120 and the stem 130 can be fastened to the correct position.

The seal grooves 101 and 111 are formed concentrically on the outer surface of the body 100 and the inner circumferential surface of the seal cover 110, respectively, and the seal groove 101 formed in the body 100 and the seal cover 110 as described above. In 111, a rubber expansion chamber 200 that contracts and expands when the valve is opened and closed is mounted. At this time, the body 100 and the seal grooves 101 and 111 of the seal cover 110 serve to support the rubber expansion chamber 200.

The concave portion 121 is formed in an arc shape at the center of the outer circumferential surface of the disk 120 so as to correspond to the convex portion 230 of the rubber expansion chamber 200, and the concave portion formed on the outer circumferential surface of the disk 120 ( When the rubber expansion chamber 200 is inflated, the convex portion 230 is pushed in and airtightly adhered to the rubber expansion chamber 200, so that airtightness can be further improved.

The rubber expansion chamber 200 is mounted to be spaced apart from the outer circumferential surface of the disk 120 in the seal groove 111, and wings 210 are integrally formed on both sides of the rubber expansion chamber 200, and both wings An expansion and contraction space 220 is formed between the 210, and a convex portion 230 is formed to protrude in an arc shape at the center of the inner circumferential surface of the rubber expansion chamber 200. At this time, the rubber expansion chamber 200 is contracted when the valve is opened to maintain a state spaced apart from the disk 120 as shown in FIG. 9B, and when the valve is closed, the rubber expansion chamber 200 is shown in FIG. 9A. As shown in FIG. 1, while being inflated by the pressure of the air supplied from the air supply socket 300, it is kept in close contact with the outer circumferential surface of the disk 120. In particular, according to the present invention, the rubber expansion chamber 200 is expanded. As the convex portion 230 is pushed into the concave portion 121 of the disk 120 by the pressure of the air, the airtightness can be further improved.

According to the present invention, arc-shaped contact portions 231 are formed on both sides of the convex portion 230 of the rubber expansion chamber 200, and a groove 232 is formed between the convex portion 230 and the contact portion 231. It is characterized in that each is formed. At this time, when the valve is closed, the contact portions 231 are in close contact with each other in airtight manner to the outer circumferential surface of the disk 120 while expanding as in FIG. 9A, and the groove 232 is the rubber expansion chamber 200 when the valve is closed. Since the convex portion 230 and the contact portion 231 of the disc 120 are in close contact with the concave portion 121 of the disk 120 and the outer circumferential surface more airtightly, structurally, as shown in the double-dashed line arrow of FIG. Airtightness may be further improved by forming sealing points at four points on the inner circumferential surface of the pension room 200. Meanwhile, when the valve is opened, the contact portions 231 on both sides of the rubber expansion chamber 200 are contracted to maintain a state spaced apart from the disk 120 as shown in FIG. 9B.

According to the present invention, an arc-shaped convex surface 240 is formed on an outer circumferential surface between the wings 210 on both sides of the rubber expansion chamber 200. At this time, since the convex surface 240 of the rubber expansion chamber 200 is contracted by pressure as shown in FIG. 9A when the valve is closed to compensate for the thickness, the rubber expansion chamber 200 is You can prevent it from popping. Therefore, in this invention, unlike a conventional rubber balloon, the valve seat expands due to its own elasticity and its thickness decreases and expands, whereas the convex surface 240 contracts to compensate for the thickness. It is possible to prevent the rubber expansion chamber 200 from bursting. Meanwhile, as shown in FIG. 9B, the inner circumferential surface of the seal cover 110 is formed as an arc-shaped concave surface so as to be spaced apart from the convex surface 240 of the rubber expansion chamber 200.

According to the present invention, a semicircular support groove 112 and a support protrusion 113 are formed on both sides of the seal groove 111 of the seal cover 110, and inside the wings 210 of both sides of the rubber expansion chamber 200 It is characterized in that the fixing protrusion 211 and the fixing groove 212 corresponding to the support groove 112 and the support protrusion 113 are formed. At this time, the fixing protrusions 211 on both sides of the rubber expander chamber 200 are fitted into the support grooves 112 on both sides of the seal cover 110, respectively, and the support protrusions 113 on both sides of the seal cover 110 are rubber Since the expansion chamber 200 is assembled while being fitted into the fixing grooves 212 on both sides of the expansion chamber 200, structurally, the rubber expansion chamber 200 can be rigidly fixed to the seal cover 110.

The air supply socket 300 is installed on the seal cover 110, and the air supply socket 300 is a rubber so that the rubber expansion chamber 200 is in close contact with the outer circumferential surface of the disk 120 when the valve is closed. It serves to expand the expansion chamber 200. At this time, the air supply socket 300 is installed on one side of the seal cover 110 as shown in Figs. 1 and 2, and an air supply unit for supplying air is connected to the air supply socket 300, and the seal cover In 110, an air passage 110a communicating with the expansion and contraction space 220 of the rubber expansion chamber 200 is formed. Therefore, when the valve is closed, air is supplied to the air supply socket 300 through the air supply unit, and the air supplied from the air supply socket 300 is expanded and contracted through the air passage 110a. Since it is supplied to the space 220, the rubber expansion chamber 200 is thereby expanded as shown in FIG. 9A to be in close contact with the disk 120. On the other hand, when the valve is opened, the air supply from the air supply socket 300 is blocked, and when the supply of air is blocked, the rubber expansion chamber 200 is contracted as shown in FIG. 9B by its own restoring force, and the disk 120 And spaced apart.

That is, when the valve is closed, it rotates in the direction in which the disk 120 is closed integrally with the stem 130 according to the operation of the driving unit, and the expansion space of the rubber expansion chamber 200 through the air supply socket 300 Since air is supplied to 220, the rubber expansion chamber 200 is hermetically attached to the disk 120 while expanding as shown in FIG. 9A. On the contrary, when the valve is opened, the air supply from the air supply socket 300 is stopped, and when the supply of air is stopped, the rubber expansion chamber 200 contracts as shown in FIG. 9B by its own restoring force, whereby the rubber expansion Since the seal 200 is separated from the disk 120, when the disk 120 is rotated to open the valve, contact between the disk 120 and the rubber expansion chamber 200 does not occur. ) Damage is prevented. Meanwhile, FIG. 9C shows a state in which pressure is applied to the outside of the rubber expansion chamber 200 due to the internal pressure of the pipe and the flow of the fluid.

The reinforcing material 400 is inserted into the inner central layer of the rubber expansion chamber 200, and the reinforcing material 400 reinforces the strength of the rubber expansion chamber 200 to improve durability. At this time, the reinforcing material 400 is inserted in a structure surrounding the inner central layer of the body of the rubber expansion chamber 200 and the inner central layer of the wings 210 on both sides, that is, the reinforcing material 400 is a rubber expansion chamber ( 200) is inserted into the center layer during molding, and the reinforcing material 400 is formed by the pressure when the rubber expansion chamber 200 expands by receiving the air pressure supplied from the air supply socket 300. 200) prevents popping. Meanwhile, FIG. 15 shows another embodiment of the reinforcement material 400 according to the present invention. According to another embodiment of the present invention, the reinforcement material 400 is an inner surface of the rubber expansion chamber 200 as shown in FIG. 15. It is also possible to put the reinforcing material 400 to be molded on the inner surface of the rubber expansion chamber 200.

Here, according to a preferred embodiment of the present invention, the rubber expansion chamber 200 is made of an elastomer, and the reinforcing material 400 is made of a fabric. At this time, since the rubber expansion chamber 200 is made of an elastomer having a property of increasing several times when pulled by applying an external force and returning to its original length when the external force is removed, it can faithfully perform the role of contraction and expansion, and the reinforcing material Since 400 is made of a fabric (cloth), it is possible to prevent the rubber expansion chamber 200 from bursting due to pressure during expansion by reinforcing the overall strength of the rubber expansion chamber 200.

According to another embodiment of the present invention, as shown in FIG. 10, a plurality of grooves 250 are formed on the inner circumferential surface of the rubber expansion chamber 200. At this time, if a plurality of grooves 250 are formed on the inner circumferential surface of the rubber expansion chamber 200, the inner circumferential surface of the rubber expansion chamber 200 that is airtightly adhered to the outer circumferential surface of the disk 120 as it expands when the valve is closed. Since many sealing points are formed, the airtightness can be further improved.

According to another embodiment of the present invention, as shown in FIG. 11, a plurality of protrusions 260 are formed on both outer surfaces of the rubber expansion chamber 200, and a plurality of grooves 122 are formed on the outer circumferential surface of the disk 120. It is characterized by being formed. At this time, the protrusion 260 serves to improve the sealing contact sealing ability of the outer surfaces of both sides of the rubber expansion chamber 200, and the groove 122 of the disk 120 is formed with the rubber expansion chamber 200. It plays the role of reinforcing the sealing contact sealing ability.

Meanwhile, according to the present invention, as shown in FIGS. 12A to 14B, the undercover 140 fixed to the lower portion of the body 100 has the stem 130 and the body ( It is characterized in that the air nozzle 500 for removing foreign substances to remove foreign substances by spraying air under the flow path of 100) is installed. At this time, the air nozzle 500 is installed on the undercover 140, and an air supply unit for supplying air is connected to the air nozzle 500, and the stem 130 communicates with the inner flow path of the body 100. The air passage 133 is formed. Therefore, if air is supplied to the air nozzle 500 in advance and air is injected into the air passage 133 before opening the valve, foreign matter accumulated in the lower portion of the passage of the stem 130 and the body 100 is blown out by air pressure to remove it. In this way, if the disk 120 is rotated and opened after removing the foreign material, it is possible to prevent the disk 120 from being split from the foreign material.

According to an example of the present invention, as shown in FIGS. 12A and 12B, one discharge port 133a is formed in the discharge portion of the air passage 133 of the stem 130 to inject air as shown by an arrow.

According to another example of the present invention, as shown in Figs. 13A and 13B, two discharge ports 133a are formed at both sides in the discharge portion of the air passage 133 of the stem 130 to inject air as shown by an arrow.

According to another example of the present invention, as shown in FIGS. 14A and 14B, two discharge ports 133a are formed on both sides in the discharge part of the air passage 133 of the stem 130, and a circular discharge part 133b is formed at the edge. By forming an arrow, it is possible to inject air as a whole (360 degrees in front) under the flow path of the body 100.

Therefore, in the present invention, the rubber expansion chamber 200 is mounted in the seal groove 111 of the body 100 and the seal cover 110 so as to be spaced apart from the disk 120, and the seal cover 110 has rubber when the valve is closed. Since an air supply socket 300 for supplying air to and expanding the expansion chamber 200 is installed, when the valve is opened, the rubber expansion chamber 200 is contracted and separated from the disk 120, and the valve is closed. When the rubber expansion chamber 200 is expanded, air is injected so as to tightly adhere to the outer circumferential surface of the disk 120 to maintain airtightness.

In addition, in the present invention, since the convex portion 230 and the concave portion 121 corresponding to each other on the inner circumferential surface of the rubber expansion chamber 200 and the outer circumferential surface of the disk 120 are formed in an arc shape, the rubber expansion chamber 200 The convex portion 230, which is subjected to pressure during expansion of the disk 120, is pushed into the concave portion 121 of the disk 120 and tightly adheres, so that the airtightness can be further improved.

In addition, since the present invention can improve durability by reinforcing the strength of the rubber expansion chamber 200 by inserting a reinforcing material 400 in the inner central layer of the rubber expansion chamber 200, it is structurally resistant to pressure during expansion. There is an advantage of preventing the rubber expansion chamber 200 from bursting.

100: body 101: thread groove
110: thread cover 111: thread groove
112: support groove 113: support protrusion
120: disk 120a: fixing part
120b: pin hole 121: concave
122: groove 130: stem
131: ball insertion groove 132: pin ball
133: air passage 140: undercover
141: ball insertion hole 150: bolt
200: rubber expansion room 210: wing
211: fixing protrusion 212: fixing groove
220: new space 230: convex
231: contact portion 232: groove
240: convex surface 250: concave
260: protrusion 300: air supply socket
400: reinforcement material 500: air nozzle
B1: Center ball P: Center pin

Claims (10)

Seal grooves 101 and 111 formed concentrically on the outer surface of the body 100 and the inner circumferential surface of the seal cover 110;
A rubber expansion chamber 200 provided in the seal groove 111 to be spaced apart from the outer circumferential surface of the disk 120 and having an expansion and contraction space 220 formed between the wings 210 on both sides and an arc-shaped convex portion 230 formed on the inner circumferential surface;
An air supply socket 300 installed on the seal cover 110 to inflate the rubber expansion chamber 200 so that the rubber expansion chamber 200 is in close contact with the disk 120 when closed;
A concave portion 121 formed on the outer circumferential surface of the disk 120 to correspond to the convex portion 230 of the rubber expansion chamber 200 and in close contact with the convex portion 230 when expanded;
The sealing structure of the butterfly valve including a reinforcing material 400 that is inserted into the inner central layer of the rubber expansion chamber 200 to reinforce strength. The method of claim 1,
An arc-shaped contact portion 231 is formed on both sides of the convex portion 230 of the rubber expansion chamber 200, and a groove 232 is formed between the convex portion 230 and the contact portion 231. Butterfly valve sealing structure. The method of claim 1,
The sealing structure of the butterfly valve, characterized in that an arc-shaped convex surface 240 is formed on an outer circumferential surface between the wings 210 on both sides of the rubber expansion chamber 200. The method of claim 1, wherein a semicircular support groove (112) and a support protrusion (113) are formed on both sides of the seal groove (111) of the seal cover (110), and both wings (210) of the rubber expansion chamber (200) The sealing structure of the butterfly valve, characterized in that a fixing protrusion 211 and a fixing groove 212 corresponding to the support groove 112 and the support protrusion 113 are formed inside. The sealing structure of a butterfly valve according to claim 1, wherein the rubber expansion chamber (200) is made of an elastomer, and the reinforcing material (400) is made of a fabric. The sealing structure of a butterfly valve according to claim 1, wherein a plurality of grooves (250) are formed on the inner circumferential surface of the rubber expansion chamber (200). The method of claim 1, wherein a pin hole (120b) (132) into which a center pin (P) is inserted is formed in the stem 130 assembled to the fixing part (120a) and the fixing part (120a) of the disk (120), The center pin (P) is a sealing structure of a butterfly valve, characterized in that the pin hole (120b) is fixed by fastening the bolt (150) in a state inserted into the (132). The stem according to claim 1, wherein a ball insertion hole (141) into which a center ball (B1) is inserted is formed in the undercover (140) fixed to the lower portion of the body (100), and is fitted into the undercover (140). (130) The sealing structure of the butterfly valve, characterized in that the center ball (B1) is inserted into the ball insertion groove (131) is formed. The butterfly of claim 1, wherein a plurality of protrusions (260) are formed on both outer surfaces of the rubber expansion chamber (200), and a plurality of grooves (122) are formed on the outer circumferential surface of the disk (120). Valve sealing structure. The method of claim 1, wherein the undercover (140) fixed to the lower portion of the body (100) is provided with air through an air passage (133) formed in the stem (130). The sealing structure of the butterfly valve, characterized in that the air nozzle 500 for removing foreign substances by spraying to remove foreign substances is installed.

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