CN219082276U

CN219082276U - Plastic-lined three-eccentric sealing butterfly valve

Info

Publication number: CN219082276U
Application number: CN202223553221.0U
Authority: CN
Inventors: 朱少兵; 王学朋; 贾华; 朱耀龙; 徐乐
Original assignee: Wuzhong Instrument Co Ltd
Current assignee: Wuzhong Instrument Co Ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-26
Anticipated expiration: 2032-12-29

Abstract

The utility model provides a plastic-lined three-eccentric sealing butterfly valve, which comprises a valve seat, a valve plate and a valve shaft, wherein a supporting lining is circumferentially wrapped outside the valve plate, a side lining is also fixed on the valve seat corresponding to the contact surface of the valve seat and the valve plate, and the contact surface of the supporting lining and the side lining in the opening and closing movement process is a sealing surface; the valve shaft is deviated from the central line of the sealing surface; the central line of the sealing surface deviates from the central line of the valve seat body; the axle center of the valve shaft deviates from the center line of the valve body. The utility model has reasonable structural design, adopts a three-eccentric structural design, can instantly separate the valve plate from the valve seat, eliminates the friction interference between the valve plate and the valve body when the valve plate is sealed by the sealing surface, effectively eliminates the friction contact in the rotation range of 80%, reduces the torque, and removes the possibility of abrasion and leakage. Meanwhile, by designing a nonmetallic supporting lining on the valve body and the convex metal sealing surface on the valve plate, the valve plate can be prevented from excessively extruding the lining layer or damaging the sealing surface when in closing, and meanwhile, a good limiting effect can be achieved.

Description

Plastic-lined three-eccentric sealing butterfly valve

Technical Field

The utility model relates to the technical field of valves, in particular to a plastic-lined three-eccentric sealing butterfly valve.

Background

The central line butterfly valve is a component for realizing on-off and flow control of a pipeline system, and is structurally characterized in that the axle center of a valve rod, the center of a butterfly plate and the center of a body are positioned at the same position, and a valve plate and a valve seat are always in extrusion and scraping states, and have large resistance distance and rapid abrasion. When the valve is opened and closed, the valve body and the valve plate sealing surfaces are mutually contacted and extruded to lead to the abrasion of the sealing surfaces, and the end surfaces of the two axial sides are always in an extrusion state, which is not beneficial to sealing.

How to carry out the institutional advancement to current central line butterfly valve for it can more effective seal, is the key point of industry technicians' improvement. Meanwhile, in the use process of the existing butterfly valve, the metal lining is easy to wear, the lining layer is easy to damage due to excessive extrusion of the valve plate, and the sealing surface of the lining layer is easy to damage during closing.

Therefore, how to solve the problem that the sealing existing in the existing center line butterfly valve is difficult, the sealing surface is easy to wear and damage, and the butterfly valve needs to be further improved.

Disclosure of Invention

The utility model aims to solve the technical problems that: in order to overcome the defects of the prior art, the utility model provides the plastic-lined tri-eccentric sealing butterfly valve which can effectively seal, reduce extrusion in the sealing process, reduce friction between a valve plate and a valve seat, effectively remove the possibility of abrasion and leakage, and prevent corrosion of the contact part of the valve and a medium.

The technical scheme adopted for solving the technical problems is as follows: the plastic-lined three-eccentric sealing butterfly valve comprises a valve seat, a valve plate and a valve shaft connected to the valve plate, wherein the valve shaft drives the valve plate to open and close relative to the valve seat, a supporting lining is circumferentially wrapped on the valve plate, a side lining is also fixed on the valve seat corresponding to the contact surface of the valve seat and the valve plate, and the contact surface of the supporting lining and the side lining in the opening and closing movement process is a sealing surface; the valve shaft is deviated from the central line of the sealing surface; the central line of the sealing surface deviates from the central line of the valve seat body, the circumferential direction of the sealing surface is 360 degrees continuously, and the circumferential shape of the sealing surface is in an asymmetric shape relative to the central line of the valve seat body; the axle center of the valve shaft deviates from the center line of the valve body.

In the scheme, three eccentric structures are reasonably designed, namely, the valve shaft deviates from the center line of the sealing surface, the center line of the sealing surface deviates from the center line of the valve seat body, the valve shaft center deviates from the center line of the valve body, when the valve is opened and closed, the valve plate rotates to generate a cam effect, and the valve plate can be instantaneously separated from the valve seat when being opened, so that the contact friction between the valve plate and the valve seat is effectively reduced, the torque is reduced, and the possibility of abrasion and leakage is removed. And meanwhile, a lining is arranged on the contact surface of the valve plate and the valve seat, so that the valve plate is prevented from being excessively extruded or damaged when the valve plate is closed relative to the valve body, and good limiting and anti-abrasion supporting effects are achieved.

Further, the circumferential shape of the sealing surface is inclined to the center line of the valve seat body along one side of the radial section of the valve seat body, and the other side of the radial section of the valve seat body is parallel to the center line of the valve seat body.

Further, the outer peripheral surfaces of the valve plates are wrapped with supporting liners. The supporting lining is wrapped on the outer peripheral surface, so that the whole valve plate is guaranteed to have good mechanical properties, and the service life of the valve plate is prolonged.

Further, the upper side and the lower side of the valve seat corresponding to the sealing surface are respectively provided with an embedded groove, and the side lining is fixed on the valve seat through embedded matching with the embedded grooves. Through the design of embedded groove, the side lining can be conveniently, fast and reasonably firmly connected and fixed with the valve seat.

Furthermore, any side of the circumferential side surface of the inner wall of the groove body of the embedded groove is a wedge surface, so that the side lining and the valve seat are matched and fixed, and the matching is stable and reliable.

Preferably, the support lining and the side lining are made of non-metal materials. The non-metal material is adopted, so that corrosion of the medium in the valve to the valve plate and the valve seat can be effectively avoided, and the service life of the butterfly valve is effectively prolonged.

The plastic-lined three-eccentric sealing butterfly valve has the beneficial effects that the structural design is reasonable, the three-eccentric structural design is adopted, the valve plate opening type and the valve seat can be instantaneously separated, the friction interference between the valve plate and the valve body during sealing is eliminated through the sealing surface, the friction contact in the rotation range of 80% is effectively eliminated, the torque is reduced, and the possibility of abrasion and leakage is eliminated. Meanwhile, by designing a nonmetallic supporting lining on the valve body and the convex metal sealing surface on the valve plate, the valve plate can be prevented from excessively extruding the lining layer or damaging the sealing surface when in closing, and meanwhile, a good limiting effect can be achieved.

Drawings

The utility model will be further described with reference to the drawings and examples.

Fig. 1 is a schematic structural view of a preferred embodiment of the present utility model.

Fig. 2 is an enlarged schematic view at a in fig. 1.

In the figure, 1, a valve shaft 2, a valve plate 3, a support lining 4, a side lining 5 and a valve seat are shown.

Detailed Description

The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only those features which are relevant to the utility model, and orientation and reference (e.g., up, down, left, right, etc.) may be used solely to aid in the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

Embodiment one:

a plastic-lined triple offset seal butterfly valve as shown in fig. 1 and 2 is a first embodiment of the present utility model, and includes a valve seat 5, a valve plate 2, and a valve shaft 1 connected to the valve plate 2. The valve shaft 1 drives the valve plate 2 to open and close relative to the valve seat 5, and controls the opening and closing of the channel in the butterfly valve, so that medium circulation and blocking are realized.

The valve plate 2 is circumferentially wrapped with a supporting lining 3, and a side lining 4 is also fixed on the valve seat 5 corresponding to the contact surface between the valve seat 5 and the valve plate 2. The support lining 3 and the side lining 4 are made of non-metal materials. The nonmetallic material can preferably adopt the lining plastic design, and for original metal valve plate 2 and disk seat 5, the support lining 3 and the side lining 4 of lining plastic material can effectively avoid the corrosion of medium to valve plate 2 and disk seat 5 in the valve, effectively prolong the life of butterfly valve. Meanwhile, the valve plate 2 can play a good limiting role and prevent the sealing surface from being damaged when the valve plate 2 excessively extrudes the lining layer or closes.

The contact surface of the support lining 3 and the side lining 4 in the opening and closing movement process is a sealing surface. The sealing butterfly valve is of a three-eccentric structure design and is respectively:

1. the valve shaft 1 deviates from the center line of the sealing surface, so that the circumferential direction of the sealing surface of the valve plate 2 and the circumferential direction of the valve seat 5 are continuous and 360 degrees, the valve plate 2 and the circumferential direction of the valve seat 5 are simultaneously contacted at 360 degrees when the valve is closed, the sealing is good, and the leakage risk is avoided. As shown in P1 in fig. 1, P1 is the distance of the valve shaft 1 from the center line of the sealing surface.

2. The axis of the valve shaft 1 is offset from the center line of the valve body. That is, as shown by P2 in fig. 1, P2 is the distance of the valve shaft 1 from the center line of the valve body. When the valve plate 2 rotates, the valve plate 2 generates a cam effect relative to the valve seat 5, and when the valve plate 2 is opened, the valve plate 2 and the valve seat 5 can be instantaneously separated, so that the contact friction between the valve plate 2 and the valve seat 5 in the rotation range of 80% is eliminated, and the torque is effectively reduced.

3. The central line of the sealing surface deviates from the central line of the valve seat 5 body, and the circumferential shape of the sealing surface is asymmetric relative to the central line of the valve seat 5 body. Specifically, the circumferential shape of the sealing surface is inclined to the body center line of the valve seat 5 along one side of the radial section of the body of the valve seat 5, and the other side is parallel to the body center line of the valve seat 5. The center line of the sealing surface deflects by an angle A relative to the center line of the valve, the valve is not interfered when being opened and closed, and the unbalanced moment is small, namely, the friction interference of the rest 20 percent is eliminated, and the possibility of abrasion and leakage is avoided.

The three eccentric sealing butterfly valve is characterized in that three eccentric structures are reasonably designed, when the valve is at 0-90 degrees, the valve plate 2 and the valve seat 5 are not interfered, when the valve is closed, the valve plate 2 and the sealing surface of the valve seat 5 are simultaneously contacted at 360 degrees, the sealing effect is achieved by completely depending on the contact surface pressure of the valve seat 5 and the valve plate 2, and the sealing between the sealing surface of the valve plate 2 and the valve seat 5 is realized by pressing the valve plate 2 to the valve seat 5 by the torque of a transmission device.

The valve plate 2 can be instantaneously separated from the valve seat 5 when being opened, so that the contact friction between the valve plate 2 and the valve seat 5 is effectively reduced, the torque is reduced, and the possibility of abrasion and leakage is removed. Meanwhile, a lining is arranged on the contact surface of the valve plate 2 and the valve seat 5, so that the valve plate 2 is prevented from being excessively extruded or damaged when the valve plate 2 is closed relative to the valve body, and good limiting and anti-abrasion supporting effects are achieved.

Embodiment two:

a plastic-lined triple eccentric seal butterfly valve as shown in FIG. 1 is a second embodiment of the utility model. Second embodiment further improvements are made to the support liner 3 and the side liner 4 on the basis of the first embodiment.

Specifically, the outer peripheral surfaces of the valve plates 2 are wrapped with supporting liners 3. The supporting lining 3 is wrapped on the outer peripheral surface, so that the whole valve plate 2 is guaranteed to have good mechanical properties, the service life of the valve plate 2 is prolonged, meanwhile, the thickness of the valve plate 2 can be increased according to requirements, the axial distance of a sealing surface is widened, the sealing reliability is further improved, and the influence of local defects on the whole sealing is reduced.

The upper and lower sides of the valve seat 5 corresponding to the sealing surface are respectively provided with an embedded groove, the side lining 4 is fixed on the valve seat 5 through embedded matching with the embedded grooves, and the inner side surface of the circumferential side surface of the inner wall of the groove body of the embedded grooves is a wedge surface. Through the design of embedded groove, side lining 4 can be convenient quick and rationally firmly be connected fixedly with disk seat 5, realizes that side lining 4 is fixed with disk seat 5's cooperation, and wedge cooperation is firm reliable, also can effectively support and fixed firm when receiving the extrusion.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims

1. The utility model provides a three eccentric seal butterfly valve is moulded to lining, includes disk seat (5), valve plate (2) and connects valve shaft (1) on valve plate (2), valve shaft (1) drive valve plate (2) and do the motion of opening and shutting for disk seat (5), its characterized in that: the valve plate (2) is circumferentially wrapped with a supporting lining (3), a side lining (4) is also fixed on the valve seat (5) corresponding to the contact surface between the valve seat (5) and the valve plate (2), and the contact surface between the supporting lining (3) and the side lining (4) in the opening and closing movement process is a sealing surface;

the valve shaft (1) is deviated from the central line of the sealing surface;

the central line of the sealing surface deviates from the central line of the valve seat (5) body, the circumferential direction of the sealing surface is 360 degrees continuously, and the circumferential shape of the sealing surface is in an asymmetric shape relative to the central line of the valve seat (5) body;

the axle center of the valve shaft (1) deviates from the center line of the valve body.

2. The plastic lined tri-eccentric seal butterfly valve of claim 1, wherein: the circumferential shape of the sealing surface is inclined to the central line of the valve seat (5) body along one side of the radial section of the valve seat (5) body, and the other side of the radial section is parallel to the central line of the valve seat (5) body.

3. The plastic lined tri-eccentric seal butterfly valve of claim 1, wherein: the outer peripheral surfaces of the valve plates (2) are wrapped with supporting liners (3).

4. The plastic lined tri-eccentric seal butterfly valve of claim 1, wherein: the upper side and the lower side of the valve seat (5) corresponding to the sealing surface are respectively provided with an embedded groove, and the side lining (4) is fixed on the valve seat (5) through embedded matching with the embedded grooves.

5. The plastic lined tri-eccentric seal butterfly valve of claim 4, wherein: any side of the circumferential side surface of the inner wall of the groove body of the embedded groove is a wedge surface.

6. The plastic lined tri-eccentric seal butterfly valve of claim 1, wherein: the support lining (3) and the side lining (4) are made of nonmetal materials.