A closed butterfly valve

Abstract

The present invention relates to the field of valve technology, and in particular to a closed butterfly valve. The present invention has the advantages of simple structure, reasonable design, etc., adopts a rotating shaft assembly to be directly inlaid with a blade iron core, abandons the traditional bolt fastening, and there is no bolt in the valve body, which perfectly solves the problem of bolt catalysis and high processing costs. The blade is assembled with an iron core with a Teflon layer and a sealing ring, which saves costs and makes the blade and the rotating shaft assembly more integrated, which well avoids the risk of the blade loosening and falling, and the linkage mode is more integrated and compact, the rotation is more labor-saving, and the sealing is better.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a closed butterfly valve. Background Art

[0002] The check valve is a valve body commonly used in process exhaust systems. The commonly used circular butterfly valve is opened by tightening through-shaft screws, and the rubber-coated blades are all rubber-coated. This circular closed butterfly valve has some defects: 1. The connection between the valve blade and the shaft is bolted, which is difficult and time-consuming to assemble. At the same time, the valve stem and the blade are generally fastened with PTFE bolts, which are easily catalyzed when used in acidic and alkaline environments, thus affecting the use of the valve; 2. The bolt hole on the valve stem is too small to attach Teflon, making the processing cost of the through-shaft valve stem high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a closed butterfly valve with a simple structure, more labor-saving rotation and better airtightness.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention to solve the technical problems is:

[0005] A closed butterfly valve comprises a valve body, a blade and a driving assembly for controlling the rotation and opening and closing of the blade, wherein the blade matches the valve body and is connected to the valve body via a rotating shaft assembly; the blade comprises an iron core and a sealing ring, wherein the shape of the iron core matches the valve body, the sealing ring is arranged at the edge of the iron core, and a Teflon layer is arranged on the surface of the iron core.

[0006] As a further improvement of the present invention, the rotating shaft assembly includes two clamping blocks, which are respectively connected to the shaft end shaft and the terminal shaft, the shaft end shaft is connected to the first shaft sleeve, and the terminal shaft is connected to the second shaft sleeve.

[0007] As a further improvement of the present invention, a clamping groove for clamping the iron core is provided on the clamping block, a clamping head matching the clamping groove is provided on the edge of the iron core, and the width of the clamping groove is smaller than the thickness of the clamping head.

[0008] As a further improvement of the present invention, a limiting protrusion is provided on the clamping groove, and a positioning groove matching the limiting protrusion is provided on the clamping head.

[0009] As a further improvement of the present invention, the driving assembly includes a valve stem and a handle, the valve stem is rotated on the base, the valve stem is connected to the shaft assembly, the base is arranged on the side wall of the valve body, the handle is provided with a mounting hole, and the valve stem is passed through the mounting hole.

[0010] As a further improvement of the present invention, the drive assembly also includes a limit screw, the limit nut is connected to the base, an arc groove is provided on the handle, the limit screw is passed through the arc groove, a butterfly nut is sleeved on the limit screw, the handle is provided with anti-slip patterns matching the butterfly nut, and a scale is provided on the edge of the arc groove.

[0011] As a further improvement of the present invention, a plurality of arc-shaped drainage grooves are evenly arranged on the edges of both sides of the iron core, one end of each arc-shaped drainage groove is close to the center of the iron core, and the other end is close to the edge of the iron core, and the two cutting angles formed by all the arc-shaped drainage grooves and the outer periphery of the iron core are correspondingly equal.

[0012] As a further improvement of the present invention, the inner wall of each of the arc-shaped drainage grooves is a smooth surface, and the cross-sectional dimensions along the arc-shaped drainage groove are the same as those of the other arc-shaped drainage grooves.

[0013] As a further improvement of the present invention, the sealing strip on the inner wall of the valve body is used to seal the blade and the valve body when the blade is in the closed position. The sealing strip includes a first strip and a second strip. The first strip and the second strip are both provided with sealing protrusions. The sealing protrusions are streamlined, and the sealing protrusions on the first strip and the sealing protrusions on the second strip are staggered.

[0014] It can be seen from the above technical scheme that the present invention has the advantages of simple structure and reasonable design. The shaft assembly is directly inlaid with the blade core, abandoning the traditional bolt fastening. There is no bolt in the valve body, which perfectly solves the problems of bolt catalysis and high processing costs. The blades are assembled with an iron core and a sealing ring with a Teflon layer attached. While saving costs, it also makes the blades and the shaft assembly more integrated, which effectively avoids the risk of loosening and falling of the blades. The linkage method is more integrated and compact, the rotation is more labor-saving, and the sealing is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a closed butterfly valve of the present invention.

[0016] Figure 2 It is a side view of the present invention.

[0017] Figure 3 It is a schematic diagram of the sealing strip structure of the present invention.

[0018] Figure 4 It is a schematic diagram of the blade structure of the present invention.

[0019] Description of reference numerals: 1, valve body; 11, first gear bar; 12, second gear bar; 2, iron core; 21, sealing ring; 22, arc-shaped guide groove; 3, handle; 31, valve stem; 32, base; 33, arc-shaped groove; 34, limit screw; 4, clamping block; 41, end shaft; 42, shaft end shaft; DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0021] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 A closed butterfly valve comprises a valve body 1, a blade and a driving assembly for controlling the rotation and opening and closing of the blade, wherein the blade matches the valve body 1 and is connected to the valve body 1 through a rotating shaft assembly; the blade comprises an iron core 2 and a sealing ring 21, wherein the shape of the iron core 2 matches the valve body 1, the sealing ring 21 is arranged at the edge of the iron core 2, and a Teflon layer is arranged on the surface of the iron core 2.

[0022] The rotating shaft assembly includes two clamping blocks 4, and the two clamping blocks 4 are respectively connected to the shaft end shaft 42 and the terminal shaft 41, the shaft end shaft 42 is connected to the first shaft sleeve, and the terminal shaft 41 is connected to the second shaft sleeve.

[0023] The clamping block 4 is provided with a clamping groove for clamping the iron core 2, and the edge of the iron core 2 is provided with a clamping head matching the clamping groove, and the width of the clamping groove is smaller than the thickness of the clamping head.

[0024] The clamping groove is provided with a limiting protrusion, and the clamping head is provided with a positioning groove matching the limiting protrusion.

[0025] The shaft end shaft 42 and the terminal shaft 41 can be directly embedded in the iron core 2, abandoning the traditional bolt fastening. There is no bolt in the valve body 1, which perfectly solves the problem of bolt catalysis and high processing cost; it makes the blade and the shaft assembly more integrated, and well avoids the risk of loosening and falling of the blade.

[0026] The driving assembly includes a valve stem 31 and a handle 3. The valve stem 31 is rotated on a base 32. The valve stem 31 is connected to a rotating shaft assembly. The base 32 is arranged on a side wall of the valve body 1. A mounting hole is arranged on the handle 3, and the valve stem 31 is inserted into the mounting hole.

[0027] The driving assembly also includes a limit screw 34, the limit nut is connected to the base 32, an arc groove 33 is provided on the handle 3, the limit screw 34 is passed through the arc groove 33, a butterfly nut is sleeved on the limit screw 34, the handle 3 is provided with anti-slip patterns matching the butterfly nut, and a scale is provided on the edge of the arc groove 33.

[0028] A plurality of arc-shaped drainage grooves are evenly arranged on the edges of both sides of the core 2, one end of each arc-shaped drainage groove is close to the center of the core 2, and the other end is close to the edge of the core, and the two cutting angles formed by all the arc-shaped drainage grooves and the outer periphery of the core 2 are equal.

[0029] The inner wall of each of the arc-shaped drainage grooves is a smooth surface, and the cross-sectional dimensions along the arc-shaped drainage groove are the same as those of other arc-shaped drainage grooves.

[0030] The arc-shaped guide groove 22 includes a first arc line and a second arc line, wherein the first arc line is connected to one end of the second arc line, and the connection point between the two is close to the center of the iron core 2 or coincides with the center.

[0031] Drawing on the wing structure suitable for flying birds, the arc-shaped drainage groove imitates the shape of flying bird wings and the wing gap structure between the wing feathers to design the end face groove contour. There are multiple wing gaps between the wing feathers and the upper wing surface for airflow to pass through, which has a stronger guiding and converging effect on the front flow, and can effectively prevent the airflow from leaving the wing surface too early and forming vortices.

[0032] The arc groove has the function of circumferential guidance and flow balancing and pressure stabilization for the fluid. The roots of the arc-shaped drainage grooves converge to the center of the iron core 2, which has the function of circumferential guidance for the fluid, thereby effectively avoiding the occurrence of excessive flow velocity in the valve when the blades are opened and closed, reducing the erosion of impurities in the fluid medium, and extending the service life of the iron core 2. At the same time, it makes its rotation more labor-saving and has better sealing.

[0033] The present invention can realize stable operation of the valve under different working conditions by changing the circumferential width ratio of the drainage groove, the radial width ratio of the arc groove and the position relative to the drainage groove.

[0034] The sealing strip on the inner wall of the valve body 1 is used to seal the blade and the valve body 1 when the blade is in the closed position. The sealing strip includes a first strip 11 and a second strip 12. The first strip 11 and the second strip 12 are both provided with sealing protrusions. The sealing protrusions are streamlined. The sealing protrusions on the first strip 11 and the sealing protrusions on the second strip 12 are staggered.

[0035] The sealing protrusions on the first gear bar 11 and the sealing protrusions on the second gear bar 12 are arranged alternately. When closing the valve, there is no need to accurately find the sealing angle, and the valve can be directly opened and closed by rotating, which is simple and convenient.

[0036] After the blade is put on the molded sealing ring 21, the end shaft 41 and the shaft end shaft 42 are embedded in the blade, and the sealing strip perfectly wraps the connection between the shaft and the iron core 2. No screws can be seen inside the valve body 1. The linkage method is more integrated and compact, the rotation is more labor-saving, and the sealing is better.

[0037] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A closed butterfly valve, characterized in that: The invention comprises a valve body, a blade and a driving assembly for controlling the rotation opening and closing of the blade, wherein the blade matches the valve body and is connected to the valve body through a rotating shaft assembly; the blade comprises an iron core and a sealing ring, wherein the shape of the iron core matches the valve body, the sealing ring is arranged at the edge of the iron core, and a Teflon layer is arranged on the surface of the iron core; the rotating shaft assembly comprises two clamping blocks, wherein the clamping blocks are provided with a clamping groove for clamping the iron core, the clamping groove is provided with a limiting protrusion, the iron core is provided with a positioning groove matching the limiting protrusion, and a plurality of arc-shaped drainage grooves are evenly arranged on the edges of both sides of the iron core, and one end of each arc-shaped drainage groove is close to the iron core The arc guide groove has one end near the center and the other end near the edge of the iron core, and the two tangent angles formed by all the arc guide grooves and the outer periphery of the iron core are corresponding and equal, the arc guide groove includes a first arc line and a second arc line, the first arc line is connected to one end of the second arc line, and the connection point of the two is close to the center of the iron core or coincides with the center; the sealing strip on the inner wall of the valve body is used to seal the blade and the valve body when the blade is in the closed position, and the sealing strip includes a first strip and a second strip, and the first strip and the second strip are both provided with sealing protrusions, the sealing protrusions are streamlined, and the sealing protrusions on the first strip and the sealing protrusions on the second strip are staggered.

2. The closed butterfly valve according to claim 1, characterized in that: The two clamping blocks are connected to the shaft end shaft and the terminal shaft respectively. The shaft end shaft is connected to the first shaft sleeve, and the terminal shaft is connected to the second shaft sleeve.

3. The closed butterfly valve according to claim 2, characterized in that: The edge of the core is provided with a clamping head matching the clamping groove, and the width of the clamping groove is smaller than the thickness of the clamping head.

4. The closed butterfly valve according to claim 1, characterized in that: The driving assembly includes a valve stem and a handle. The valve stem is rotated on a base. The valve stem is connected to a rotating shaft assembly. The base is arranged on a side wall of the valve body. A mounting hole is arranged on the handle. The valve stem is inserted into the mounting hole.

5. The closed butterfly valve according to claim 4, characterized in that: The driving assembly also includes a limiting screw, the limiting nut is connected to the base, an arc groove is provided on the handle, the limiting screw is passed through the arc groove, a butterfly nut is sleeved on the limiting screw, the handle is provided with anti-slip patterns matching the butterfly nut, and a scale is provided on the edge of the arc groove.

6. The closed butterfly valve according to claim 1, characterized in that: The inner wall of each of the arc-shaped drainage grooves is a smooth surface, and the cross-sectional dimensions along the direction of the arc-shaped drainage groove are the same as those of other arc-shaped drainage grooves.

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