CN211820778U

CN211820778U - Special two-way soft sealing flange butterfly valve of sea water

Info

Publication number: CN211820778U
Application number: CN201922333702.2U
Authority: CN
Inventors: 陈天顺
Original assignee: Shanghai Kerui Valve Co ltd
Current assignee: Shanghai Kerui Valve Co ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-10-30
Anticipated expiration: 2029-12-23

Abstract

The utility model discloses a special two-way soft sealing flange butterfly valve of sea water belongs to the valve field, including valve body, valve seat, valve rod and butterfly plate, be equipped with the valve seat sealing face of slope on the valve seat, be provided with the seal groove on the circumference lateral wall of butterfly plate, install the elasticity sealing washer in the seal groove, the elasticity sealing washer includes the outside extension portion of this part of body and connection on this part of body with the seal groove looks adaptation, the outside extension portion is opposite with the valve seat sealing face inclination direction, the outside extension portion forms sealedly with valve seat sealing face butt; the butterfly plate is provided with reverse sealing mechanism towards the fixed terminal surface of disk seat one side, and reverse sealing mechanism includes fixed column, lock nut, compression spring, sliding sleeve and clamping ring, and lock nut, sliding sleeve, spring suit are in proper order on the outer wall of fixed column, and the clamping ring passes through connecting piece and sliding sleeve fixed connection, clamping ring and outside extension butt. The utility model has the advantages of simple structure and reasonable design, take place the sealed condition of revealing when can effectually preventing the reverse atress of butterfly plate.

Description

Special two-way soft sealing flange butterfly valve of sea water

Technical Field

The utility model relates to a valve field, in particular to special two-way soft sealing flange butterfly valve of sea water.

Background

The valve is a control part in a fluid conveying system, has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like, has various types, can be divided into a gate valve, a stop valve, a plug valve, a ball valve, a butterfly valve and the like according to the function and the application, is widely used in industries such as natural gas long-line conveying pipelines, metallurgy, hydropower, thermoelectricity, urban water supply and drainage, farmland irrigation and drainage and the like, is suitable for media including natural gas, coal gas, steam, air, water and the like, and is used for stopping or communicating the media in a medium bidirectional exchange pipeline system.

The butterfly valve mainly comprises a valve body, a valve seat and a valve rod, wherein the valve seat is arranged in the valve body, a butterfly plate is arranged on the valve rod, and the valve rod is rotated to drive the butterfly plate to rotate so as to realize the opening and closing of the valve body.

The butterfly valve comprises a single-eccentric butterfly valve, a double-eccentric butterfly valve, a triple-eccentric butterfly valve and a four-eccentric butterfly valve, and the evolution process of the eccentric structure of the butterfly valve aims to reduce the abrasion between a valve plate and a valve seat in the opening and closing process of the valve. When the existing eccentric butterfly valve is closed under forward pressure, medium pressure acts on the butterfly plate, the valve is completely attached to the valve plate sealing ring and the valve seat by means of torque force, and the larger the pressure is, the tighter the sealing is, and the tighter the sealing state is. In the field of butterfly valves for seawater, because the double eccentric seal valve has the comprehensive advantages of simple structure, good sealing effect and the like, the butterfly valve mainly adopting the double eccentric structure is widely applied in the field of seawater sealing. In the field of seawater, a special soft sealing flange butterfly valve for seawater is commonly used, and is suitable for seawater medium pipelines in industries such as petroleum, petrifaction, chemical industry, electric power, environmental protection, nuclear power, seawater desalination and the like in coastal areas for cutting off and adjusting medium flow.

At present, butterfly valves on the market, including seawater special flange butterfly valves, basically realize the sealing effect through simple sealing rings on the butterfly plates, so that the sealing rings are easy to shift or even fall under the pressure effect of media in the using process to influence the sealing effect. In eccentric butterfly valve structure, can set the inner wall of disk seat to unilateral tilting, make on the one hand the valve plate can be on the other hand with its laminating, on the other hand also makes the valve plate avoid the condition appearance that sealing washer offset or drop when receiving medium forward effort, makes the sealing washer atress increase leakproofness. But the valve seat design of unilateral tilting can only play one-way good sealed effect, when rotating the butterfly plate and closing the valve body, has medium reverse acting force easily, and general butterfly valve directly influences the leakproofness of sealing washer when receiving reverse acting force, leads to the unable inseparable conflict with the valve seat inner wall of sealing washer, and then the condition of medium backward flow appears, can't realize two-way good sealed effect.

Simultaneously, clearance volume, valve plate elastic deformation and valve rod deflection between valve rod and the axle sleeve, three accumulate the deflection, lead to the sealed face of valve plate to break away from the sealed face of valve seat very easily, are the trend of breaking away from between valve plate sealing washer and the sealed face of valve seat, and sealed vice difficult formation is sealed the specific pressure, and pressure is bigger, and is sealed looser more, is the trend of pressing looser more.

SUMMERY OF THE UTILITY MODEL

The problem to the sea water that prior art exists with two eccentric butterfly valve two-way seal effect poor, appear sealed inefficacy easily, the utility model aims to provide a special two-way soft sealing flange butterfly valve of sea water.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a bidirectional soft sealing flange butterfly valve special for seawater comprises a valve body, a valve seat, a valve rod and a butterfly plate, wherein an inclined valve seat sealing surface is arranged on one side, facing the butterfly plate, of the valve seat; the butterfly plate orientation the fixed reverse sealing mechanism that is provided with of terminal surface of disk seat one side, reverse sealing mechanism includes fixed column, lock nut, compression spring, sliding sleeve and clamping ring, the fixed column is fixed on the terminal surface of butterfly plate, the sliding sleeve suit is in on the outer wall of fixed column, lock nut threaded connection be in the end of fixed column, compression spring suit is in on the fixed column outer wall and one end butt sliding sleeve, other end butt the butterfly plate, the clamping ring pass through the connecting piece with sliding sleeve fixed connection, the clamping ring with outside extension butt.

Preferably, the clamping ring is coaxially sleeved outside the circumferential side wall of the butterfly plate, the connecting piece is L-shaped, one end of the connecting piece is fixed to the clamping ring, and the other end of the connecting piece is fixed to the sliding sleeve.

Preferably, the connecting pieces are a plurality of, and the connecting pieces are evenly distributed in the circumferential direction.

Preferably, the elastic sealing ring is manufactured in an integral molding mode.

Preferably, the elastic sealing ring is EPDM.

Preferably, the valve body and the butterfly plate are made of nichrome cast iron or nichrome nodular cast iron; the valve rod and the valve seat are made of duplex stainless steel or copper alloy.

Preferably, the inner surface and the outer surface of the butterfly valve are both coated with epoxy resin or heavy anti-corrosion paint.

By adopting the technical scheme, the inclination directions of the valve seat sealing surface and the outward extension part of the elastic sealing ring are opposite, so that when the butterfly plate is stressed positively, the outward extension part is restrained by the valve seat sealing surface to generate a contraction effect, and the contact between the outward extension part and the valve seat is ensured to be tighter; due to the arrangement of the reverse sealing mechanism, when the valve plate is stressed reversely and displaces, and a gap is formed between the outward extending part and the valve seat sealing surface, the elastic potential energy of the compression spring is released, the outward extending part is forced to open, the diameter of the outer edge end of the outward extending part is enlarged, the sealing position with the enlarged diameter on the valve seat sealing surface can be well matched, and the butterfly plate can still be tightly attached to the valve seat sealing surface after being displaced reversely.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a front view of the reverse sealing mechanism of the present invention installed on the butterfly plate.

In the figure, 1-valve body, 11-packing groove, 12-packing gland, 13-shaft sleeve, 2-butterfly plate, 3-valve rod, 4-valve seat, 5-elastic sealing ring, 51-body part, 52-outward extension part, 6-fixing column, 7-locking nut, 8-compression spring, 9-sliding sleeve, 10-pressing ring and 14-connecting piece.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "back", etc. indicate the orientation or position relationship of the structure of the present invention based on the drawings, and are only for the convenience of describing the present invention, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the technical scheme, the terms "first" and "second" are only used for referring to the same or similar structures or corresponding structures with similar functions, and are not used for ranking the importance of the structures, or comparing the sizes or other meanings.

In addition, unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two structures can be directly connected or indirectly connected through an intermediate medium, and the two structures can be communicated with each other. To those skilled in the art, the specific meanings of the above terms in the present invention can be understood in relation to the present scheme in specific terms according to the general idea of the present invention.

As shown in fig. 1-3, a bidirectional soft seal flange butterfly valve special for seawater comprises a valve body 1 and a butterfly plate 2 made of nickel-chromium alloy cast iron or nickel-chromium alloy nodular cast iron material, a valve rod 3 and a valve seat 4 made of duplex stainless steel or copper alloy material, wherein flange connection faces for connecting with a pipeline are formed on two opposite end faces of the valve body 1, and the valve seat 4 is arranged inside the valve body 1; the top of the valve body 1 is provided with a shaft hole for the valve rod 3 to pass through, the top of the valve body 1 is provided with a packing groove 11 for sealing the valve rod 3 and a packing gland 12 for sealing the packing groove, and the packing gland 12 is fastened through screws; meanwhile, a shaft sleeve 13 is sleeved at the position where the valve rod 3 is contacted with the packing; the top of the valve body 1 is provided with a flange surface for connecting with a driving mechanism (a pneumatic actuator or an electric actuator or a worm turbine and the like), and the upper end of the valve rod 3 penetrates through the flange surface at the top of the valve body 1.

The lower part of the valve rod 3 penetrates into the valve body 1 and is connected with the butterfly plate 2, generally, the valve rod 3 eccentrically penetrates through the central axis of the valve body 1 (the axis of the valve rod 3 deviates from the central axis of the valve body 1), and the butterfly plate 2 is also eccentrically installed on the valve rod 3 (the central axis of the butterfly plate 2 deviates from the axis of the valve rod 3), so that the butterfly valve forms a double-eccentric flange butterfly valve. The lower end of the valve rod 3 is rotatably connected to the valve body 1 through a shaft sleeve or a bearing made of copper alloy material, and similarly, the upper part of the valve rod 3 is also rotatably connected to the valve body 1 through a shaft sleeve or a bearing made of copper alloy material.

As a valve dedicated to seawater, in addition to corrosion resistance of the material of the member, in this embodiment, epoxy resin or heavy anti-corrosive paint is coated on both the inner and outer surfaces of the butterfly valve.

In the present embodiment, the side of the valve seat 4 facing the butterfly plate 2 is provided with an inclined valve seat sealing surface whose diameter gradually increases from the side away from the butterfly plate 2 to the side close to the butterfly plate 2. The butterfly plate 2 adopts a double-flat-plate flow type design, the strength and the low head loss under the dynamic impact of water can be ensured, a sealing groove is arranged on the circumferential side wall of one end, facing the valve seat 4, of the butterfly plate 2, an elastic sealing ring 5 is installed in the sealing groove, the elastic sealing ring 5 comprises a body part 51 matched with the sealing groove and an outward extending part 52 connected to the body part 51, the inclination directions of the outward extending part 52 and the sealing surface of the valve seat are opposite, and the outward extending part 52 is in soft sealing after being abutted against the sealing surface of the valve seat. When the butterfly plate 2 is subjected to the positive force of a medium, such as the right side force shown in fig. 1, the butterfly plate 2 has a tendency and a force to move to the left side, the outward extension portion 52 presses against the valve seat sealing surface, and the larger the positive force of the butterfly plate 2 is, the tighter the seal between the outward extension portion 52 and the valve seat sealing surface is, so that the positive seal is ensured.

Meanwhile, in this embodiment, the end surface of the butterfly plate 2 facing one side of the valve seat 4 is fixedly provided with a reverse sealing mechanism, and the reverse sealing mechanism comprises a fixing column 6, a locking nut 7, a compression spring 8, a sliding sleeve 9 and a compression ring 10. Wherein, the fixed column 6 is fixedly connected on the end surface of the butterfly plate 2 in a welding or thread way; the sliding sleeve 9 is sleeved on the outer wall of the fixed column 6, and the sliding sleeve 9 is in clearance fit with the fixed column 6; the locking nut 7 is in threaded connection with the tail end of the fixed column 6, and the diameter of the locking nut 7 is larger than the inner diameter of the sliding sleeve 9, so that the locking nut 7 can limit the position of the sliding sleeve 9; the compression spring 8 is sleeved on the outer wall of the fixed column 6, one end of the compression spring is abutted against the sliding sleeve 9, and the other end of the compression spring is abutted against the end face of the butterfly plate 2; the pressing ring 10 is fixedly connected with the sliding sleeve 9 through the connecting piece 14, and the pressing ring 10 is abutted against the outward extending part 52. The arrangement is such that by screwing the lock nut 7 to make the compression spring 8 have a compression elastic force, in the case where the inner end of the outward extension 52 (the end of the connecting body portion 51) deforms the fulcrum, the pressing ring 10 forces the outward extension 52 to expand (the angle with the axis of the valve body 1 increases); therefore, when the butterfly plate 2 is subjected to reverse force and is displaced (as shown in fig. 1, the butterfly plate 2 is stressed on the left side and integrally moves rightwards), a gap appears between the outward extension part 52 and the valve seat sealing surface, the gap can cause medium leakage, but the gap exists, so that the elastic force of the compression spring 8 has a released space, at the moment, the pressing ring 10 can move rightwards under the elastic force action of the compression spring 8, so that the outward extension part 52 expands outwards (the angle between the outward extension part 52 and the axis of the valve body 1 is increased, and the angle between the outward extension part 52 and the valve rod 3 is reduced), and the gap is filled again, and the medium is ensured not to be leaked.

In this embodiment, the pressing ring 10 is coaxially sleeved outside the circumferential side wall of the butterfly plate 2, the connecting member 14 is in an L shape, one end of the connecting member 14 is fixed on the pressing ring 10, and the other end of the connecting member is fixed on the sliding sleeve 9. Meanwhile, the connecting pieces 14 are arranged in a plurality, and the connecting pieces 14 are circumferentially and uniformly distributed.

In this embodiment, the elastic seal ring 5 is integrally formed, and the material of the elastic seal ring 5 is EPDM.

When the butterfly valve is used, the valve rod 3 is driven to rotate by external forces such as a pneumatic actuator, an electric actuator or a worm turbine, and the butterfly plate 2 is attached to the valve seat 4 by a low friction contact force under the action of a double-eccentric structure, so that the outward extending part 52 of the elastic sealing ring 5 is tightly pressed on a sealing surface of the valve seat; when the butterfly plate 2 is subjected to the positive force of a medium, as shown in fig. 1, the right side is stressed, at this time, the butterfly plate 2 has the tendency and the force of moving towards the left side, the outward extension part 52 extrudes towards the valve seat sealing surface, and the larger the positive stress of the butterfly plate 2 is, the tighter the sealing between the outward extension part 52 and the valve seat sealing surface is, so that the positive sealing is ensured; when the butterfly plate 2 is subjected to reverse force and displaces (such as the butterfly plate 2 is stressed on the left side and integrally moves rightwards as shown in fig. 1), a gap exists between the outward extension part 52 and the valve seat sealing surface, the gap can cause medium leakage, but the gap exists, so that the elastic force of the compression spring 8 has a released space, at this time, the pressing ring 10 can move rightwards under the elastic force of the compression spring 8, so that the outward extension part 52 expands outwards (the angle between the outward extension part 52 and the axis of the valve body 1 is increased, the angle between the outward extension part 52 and the valve rod 3 is reduced), the diameter of the outer edge end of the outward extension part 52 is enlarged, a new sealing position with the enlarged diameter on the valve seat sealing surface can be well adapted, the butterfly plate 2 can still be tightly attached to the valve seat sealing surface after the butterfly plate 2 displaces reversely, and the gap is filled again, ensuring that the medium cannot leak.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.

Claims

1. The utility model provides a special two-way soft sealing flange butterfly valve of sea water, includes valve body, disk seat, valve rod and butterfly plate, its characterized in that: the butterfly plate is provided with a circumferential side wall, an inclined valve seat sealing surface is arranged on one side, facing the butterfly plate, of the valve seat, a sealing groove is formed in the circumferential side wall of the butterfly plate, an elastic sealing ring is installed in the sealing groove, the elastic sealing ring comprises a body part matched with the sealing groove and an outward extension part connected to the body part, the inclination direction of the outward extension part is opposite to that of the valve seat sealing surface, and the outward extension part is abutted to the valve seat sealing surface to form sealing; the butterfly plate orientation the fixed reverse sealing mechanism that is provided with of terminal surface of disk seat one side, reverse sealing mechanism includes fixed column, lock nut, compression spring, sliding sleeve and clamping ring, the fixed column is fixed on the terminal surface of butterfly plate, the sliding sleeve suit is in on the outer wall of fixed column, lock nut threaded connection be in the end of fixed column, compression spring suit is in on the fixed column outer wall and one end butt sliding sleeve, other end butt the butterfly plate, the clamping ring pass through the connecting piece with sliding sleeve fixed connection, the clamping ring with outside extension butt.

2. The seawater special bidirectional soft sealing flange butterfly valve according to claim 1, characterized in that: the clamping ring is coaxially sleeved outside the circumferential side wall of the butterfly plate, the connecting piece is L-shaped, one end of the connecting piece is fixed to the clamping ring, and the other end of the connecting piece is fixed to the sliding sleeve.

3. The seawater special bidirectional soft sealing flange butterfly valve according to claim 2, characterized in that: the connecting pieces are a plurality of and are circumferentially and uniformly distributed.

4. The seawater special bidirectional soft sealing flange butterfly valve according to claim 1, characterized in that: the elastic sealing ring is manufactured in an integrated mode.

5. The seawater special bidirectional soft sealing flange butterfly valve according to claim 1, characterized in that: the elastic sealing ring is EPDM.

6. The seawater special bidirectional soft sealing flange butterfly valve according to claim 1, characterized in that: the valve body and the butterfly plate are made of nickel-chromium alloy cast iron or nickel-chromium alloy nodular cast iron; the valve rod and the valve seat are made of duplex stainless steel or copper alloy.

7. The seawater special bidirectional soft sealing flange butterfly valve according to claim 1, characterized in that: the inner surface and the outer surface of the butterfly valve are coated with epoxy resin or heavy anti-corrosion paint.