Valve plate and butterfly valve applying same

Abstract

The invention relates to a valve plate and a butterfly valve applying the same. The valve plate is provided with a surrounding plate; the coaming comprises a first side part, a second side part, a first end part and a second end part; the upper edge, matched with the inner side wall of the valve body, of the first side part, the lower edge, matched with the inner side wall of the valve body, of the second side part and the central axis of the valve rod are located in a first plane; the lower edge, matched with the inner side wall of the valve body, of the first side part, the upper edge, matched with the inner side wall of the valve body, of the second side part and the central axis of the valve rod are located in a second plane; when the valve is in a completely closed state, the first plane or the second plane is perpendicular to the inner side wall of the valve body, and the other corresponding plane has an included angle beta, 0 lt relative to the plane in the opening direction of the valve; beta < lt >; and 90 degrees. The butterfly valve adopting the valve plate can effectively avoid interference between the valve plate and the inner wall of the valve body when the valve plate is opened and closed, even if the valve plate is thick, a large distance does not need to be reserved between the valve plate and the inner wall of the valve body, and therefore medium leakage and energy consumption are effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valves, in particular to a valve plate and a butterfly valve using the valve plate. BACKGROUND

[0002] The inventor has two patent applications related to the thickness of the valve plate, which must reach a certain size in structure. One is invention patent CN117212476A, which relates to a high-temperature butterfly valve and its cooling method. The outer surface of the valve plate has a heat preservation layer, which solves the problem that metal valve plates cannot be used in extremely high temperature environments. However, this makes the valve plate thicker. If the radial surface of the valve plate parallel to the valve rod is close to the inner wall of the valve body or the heat insulation layer, interference will occur when opening and closing, so that the valve cannot be opened and closed. If the radial surface of the valve plate parallel to the valve rod is far away from the inner wall of the valve body or the heat insulation layer, although the above interference problem is avoided, another problem is caused: in the closed state, the large distance between the radial surface of the valve plate and the valve body or the heat insulation liner causes a sharp increase in leakage; for high-temperature gas, the increase in leakage is not conducive to energy saving; at the same time, the thick valve plate has a larger pressure loss in the fully open state, which is also not conducive to energy saving; moreover, the adjustment accuracy of the valve with this structure is poor. The second is invention patent CN110360325A, which relates to a valve seatless butterfly valve and its soft sealing method. If the valve involved uses two layers of sealing rings parallelly arranged on the radial surface of the valve plate, it also requires a valve plate with a certain thickness. In order to avoid the above interference problem, the diameters of the two sealing rings need to be large enough, and the expensive price of corrosion-resistant and anti-aging rubber will inevitably lead to a significant increase in cost; moreover, the valve also has the problems of large pressure loss and poor energy saving. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application aims to provide a valve plate that will not interfere with the inner wall of the valve body or the inner wall of the heat insulation liner when opened, even if its thickness is large.

[0004] The technical solution of the present application is as follows: A valve plate on which a valve rod is fixed, the valve plate having a surrounding plate; the surrounding plate is arranged around the inner side of the valve body and cooperates with the sealing surface of the corresponding position of the inner wall of the valve body or the valve seat; the surrounding plate includes a first side portion and a second side portion which are symmetrical with respect to the valve rod, and a first end portion and a second end portion which are along the axial direction of the valve rod; wherein the upper edge of the first side portion cooperating with the inner wall of the valve body, the lower edge of the second side portion cooperating with the inner wall of the valve body, and the central axis of the valve rod are located in a first plane; the lower edge of the first side portion cooperating with the inner wall of the valve body, the upper edge of the second side portion cooperating with the inner wall of the valve body, and the central axis of the valve rod are located in a second plane; In the fully closed state of the valve, the first plane is perpendicular to the inner side wall of the valve body, and the second plane has an included angle β with the first plane in the opening direction of the valve; or, the second plane is perpendicular to the inner side wall of the valve body, and the first plane has an included angle β with the second plane in the opening direction of the valve; wherein 0<β<90°.

[0005] Specifically, the valve plate includes an upper cover plate and a lower cover plate, and the upper cover plate and the lower cover plate are fixedly connected with the surrounding plate or integrally formed to form a box-shaped structure, and the central axis of the valve rod is located on the middle cross section of the box-shaped structure.

[0006] Alternatively, specifically, the valve plate includes a flip plate, the flip plate is symmetrically arranged relative to the valve rod and surrounded by the surrounding plate in the middle; the surrounding plate is fixedly connected with the valve rod and integrally formed or fixedly connected with the flip plate to form a frame structure.

[0007] Here, the "upper edge" and "lower edge" are in the direction of the central axis of the valve body, one direction is upper, and the opposite direction is lower.

[0008] The application also discloses a butterfly valve using the valve plate.

[0009] Specifically, the valve body of the butterfly valve can be a square cylindrical inner cavity structure, and the inner side walls are parallel to each other; correspondingly, the first side plate and the second side plate of the surrounding plate of the valve plate are parallel to each other.

[0010] Alternatively, specifically, the valve body of the butterfly valve has a cylindrical inner cavity structure; correspondingly, the first side plate and the second side plate are symmetrically arranged relative to the valve rod and are matched with the inner side walls of the valve body at corresponding positions.

[0011] In the two cases, the valve plate can have the following specific structure: the first end and the second end and / or the cross section of the valve plate perpendicular to the axis of the valve rod are parallelogram, the diagonal of the parallelogram intersects the axis of the valve rod; in the closed state of the valve, the shorter diagonal of the parallelogram is perpendicular to the inner side wall of the valve body.

[0012] Further, the inner side wall of the valve body at the matching position with the valve plate (surrounding plate) can be fixedly provided with a heat preservation lining.

[0013] Alternatively, further, the peripheral surface of the valve plate is provided with a soft sealing structure.

[0014] Specifically, the peripheral surface of the valve plate includes the surface of the surrounding plate (including the first side plate, the second side plate, the first end and the second end) matched with the valve body or the valve seat.

[0015] Further, the soft sealing structure can include one or more soft sealing rings, which are fixed in the enclosure.

[0016] Specifically, the material of the soft sealing ring can be one of polytetrafluoroethylene, graphite, mica, ceramic fiber, and rubber. Specifically, the rubber material can be fluororubber.

[0017] Compared with the prior art, the valve plate and the butterfly valve using the valve plate have the following significant technical advantages: The valve plate effectively avoids interference between the valve plate and the inner wall of the valve body during opening and closing, so that a larger gap does not need to be reserved between the valve plate and the inner wall of the valve body even if the valve plate is thicker, thereby effectively reducing the leakage and energy consumption of the medium. At the same time, the valve plate can only be opened and closed in one direction, and the rotation angle during opening and closing is less than 90°, which is less than the rotation angle of the existing valve structure, thereby shortening the opening and closing time of the valve. In the fully open state of the valve, the first side or the second side of the valve plate faces the upstream of the medium and has an oblique sharp angle, which can reduce the pressure loss and energy consumption.

[0018] The valve plate described in the application can be applied to various butterfly valves, especially valves used in high-temperature environments such as 1150℃ and 1350℃. The interference problem during valve opening is effectively solved. For example, the high-temperature butterfly valve disclosed in the aforementioned invention patent CN117212476A, the outer thermal insulation layer of the valve plate can be thicker by using the valve plate described in the application, thereby reducing the amount of cooling air and the heat carried away by the cooling air, and achieving the effect of energy saving and consumption reduction by reducing the leakage rate. For example, the valve seat-free butterfly valve disclosed in the invention patent CN110360325A, the diameter of the rubber tube (air bag) can be reduced, thereby reducing the cost of the butterfly valve. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the butterfly valve according to embodiment 1 of the application; Figure 2 is Figure 1 A-A sectional view and a schematic diagram of the valve plate in the fully closed state, which shows the opening direction of the valve; Figure 3 is a schematic diagram of the valve plate in the fully open state of embodiment 1, which shows the closing direction of the valve; Figure 4 is a schematic diagram of the butterfly valve according to embodiment 2 of the application, in which the valve body has a thermal insulation lining; Figure 5 is Figure 4 B-B sectional view, which shows the rotation direction of the valve during opening; Figure 6is a cross-sectional view of the butterfly valve according to the embodiment 3 described in the present application, showing the direction of opening of the valve, wherein the peripheral surface of the valve plate is fixed with two layers of soft sealing structure 6, 6'; Figure 7 is a structural view of the butterfly valve according to the embodiment 4 described in the present application; Figure 8 is Figure 7 a C-C cross-sectional view of the embodiment 3 described in the present application, showing the valve plate structure combined with the frame structure in the valve body of the square tube type inner cavity structure; Figure 9 is a structural view of the butterfly valve according to the embodiment 5 described in the present application; Figure 10 is Figure 7 a D-D cross-sectional view of the embodiment 3 described in the present application, showing the valve plate structure of the box type structure; Figure 11 is a cross-sectional view of the butterfly valve according to the embodiment 6 described in the present application, showing the valve plate structure combined with the frame structure in the valve body of the cylinder type inner cavity structure, in the fully closed state of the valve; in the figure: 1. valve body 2. valve plate 2-1. first side 2-1'. second side 2-2. upper cover plate 2-2'. lower cover plate 2-3, 2-3'. flap 2-4. first end 2-4'. second end 3. valve stem 4. actuator 5. thermal insulation lining 6, 6'. soft sealing ring 7. valve seat 7-1, 7-1'. valve seat sealing surface L. shorter diagonal Y. longer diagonal DETAILED DESCRIPTION

[0020] Hereinafter, the present application will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application, but not to limit the protection scope of the present application. Embodiment 1

[0021] A butterfly valve, as shown in Figure 1 , Figure 2 and Figure 3 , comprises a valve body 1, a valve plate 2, a valve stem 3 and an actuator 4, the valve stem 3 is fixed and supported on two shaft holes of the valve body 1 with the valve plate 2, and a corresponding valve stem support frame (not shown in the figure) is assembled; The valve body 1 has a square-shaped inner cavity structure with parallel inner walls. The valve plate 2 has a box-type structure, including a surrounding plate and upper and lower cover plates 2-2 and 2-2'. The surrounding plate is arranged around the inner side of the valve body 1 and cooperates with the sealing surface of the inner wall of the valve body 1 or the valve seat at the corresponding position. It includes a first side 2-1 and a second side 2-1' symmetrical with respect to the valve stem 3, and a first end 2-4 and a second end 2-4' along the axial direction of the valve stem 3. The first side 2-1 and the second side 2-1' are parallel to each other, the upper cover plate 2-2 and the lower cover plate 2-2' are parallel to each other, and the first end 2-4 and the second end 2-4' are parallel to each other. When the valve is closed, such as Figure 2 As shown, the first side 2-1 and the second side 2-1' of the valve plate 2 are respectively engaged with or sealed to the inner wall of the valve body 1 at the corresponding position; the first end 2-4 and the second end 2-4' are respectively engaged with or sealed to the inner wall of the valve body (or the sealing surface of the valve seat) at the corresponding position.

[0022] The cross-section of the first end 2-4, the second end 2-4', and the valve plate 2 perpendicular to the axis of the valve stem 3 is a parallelogram, and the diagonal of the parallelogram intersects the axis of the valve stem 3, as shown below. Figure 2 As shown; When the valve is closed, the shorter diagonal L of the parallelogram is perpendicular to the inner wall of the valve body 1; along the valve's opening direction, the longer diagonal Y forms an angle β with the shorter diagonal L, where 0 < β < 90°. Figure 2 As shown.

[0023] Figure 3 The display shows the valve in the fully open state. It can be seen that at this time, the side portion 2-1' of valve plate 2 is not perpendicular to the direction of the medium flow; the valve closes in the opposite direction to its opening direction, as shown below. Figure 3 As shown in the image. Example 2

[0024] Based on the butterfly valve described in Example 1, and according to the specific application requirements, the inner circumference of the valve body 1 (i.e., the inner sidewall of the valve body 1 that mates with the surrounding plate of the valve plate 2) can be fixed with an insulation lining 5, such as... Figure 4 and Figure 5 As shown. Example 3

[0025] A butterfly valve, based on Embodiment 1, has a soft sealing ring 6 fixedly fitted around the circumferential surface of the valve plate 2 (i.e., the surface where the surrounding plate mates with the inner wall of the valve body 1); further, such as Figure 6 As shown, two soft sealing rings 6 and 6' can be simultaneously encircled and fixed on the circumferential surface of the valve plate 2; The soft sealing ring 6 or 6′ can be made of one of the following materials: polytetrafluoroethylene, graphite, mica, ceramic fiber, and rubber; specifically, fluororubber can be used as the rubber material.

[0026] For further details regarding the structure of the soft sealing ring and its corresponding sealing method, please refer to the valve seatless butterfly valve and its soft sealing method disclosed in patent CN 110360325. Example 4

[0027] A type of butterfly valve, such as Figure 7 As shown, the main difference between this embodiment and Embodiment 1 is that the valve plate 2 is a combined frame structure. The valve plate 2 includes two symmetrical rectangular flaps 2-3 and 2-3' and a surrounding plate. The surrounding plate includes a first end 2-4 and a second end 2-4' of a parallelogram arranged in parallel and symmetrical arrangement, and a first side portion 2-1 and a second side portion 2-1' arranged in parallel and symmetrical arrangement. The two flaps 2-3 and 2-3' are symmetrically connected to the two wings of the valve stem 3 and are surrounded by the surrounding plate in the middle. The surrounding plate and the flaps are integrally formed or fixedly connected as a frame structure, and rotate synchronously with the rotation of the valve stem. In the valve closed state, the shorter diagonal L of the parallelogram is perpendicular to the inner wall of the valve body 1. Along the valve opening direction, the longer diagonal Y has an included angle β with respect to the shorter diagonal L, where 0 < β < 90°. Figure 8 As shown. Example 5

[0028] A type of butterfly valve, such as Figure 9 As shown, the main difference between this embodiment and Embodiment 1 is that the valve body 1 has a cylindrical internal cavity structure, and the first side portion 2-1 and the second side portion 2-1' of the valve plate 2 are symmetrically arranged relative to the valve stem 3 and respectively cooperate with the inner sidewall of the valve body 1 at the corresponding position. Similar to Embodiment 1, the valve plate 2 is also a box-type structure, including an upper cover plate 2-2 and a lower cover plate 2-2', a first side portion 2-1 and a second side portion 2-1', and a first end portion 2-4 and a second end portion 2-4'; wherein, the upper cover plate 2-2 and the lower cover plate 2-2' are parallel to each other; the first end portion 2-4 and the second end portion 2-4' are parallel to each other and cooperate with the sealing surfaces 7-1 and 7-1' of the valve seat.

[0029] The cross-sections of the first end 2-4, the second end 2-4', and the valve plate 2 perpendicular to the axis of the valve stem 3 are parallelograms, and the diagonals of the parallelograms intersect the axis of the valve stem 3. In the closed state, the shorter diagonal L of the cross-section of the parallelogram passing through the central axis of the valve body 1 is perpendicular to the inner wall of the valve body 1. Figure 10 As shown. Example 6

[0030] A type of butterfly valve, such asFigure 11 As shown, it has the same cylindrical valve body 1 internal cavity structure as Embodiment 5, referring to... Figure 9 The main difference lies in that its valve plate 2 is a combined frame structure similar to that of embodiment 4, including a fixedly connected flap and a surrounding plate. The flap consists of two symmetrical arc-edged flaps 2-3 and 2-3'; each of the arc-edged flaps 2-3 and 2-3' has one arc edge (or narrow arc surface) and three straight edges (or narrow planes), wherein the first straight edge (or narrow plane) is opposite to the arc edge (or narrow arc surface), and the second straight edge (or narrow plane) is opposite to the third straight edge (or narrow plane); each of the two arc-edged flaps 2-3 and 2-3' is symmetrically connected to the two wings of the valve stem 3 at its first straight edge (or narrow plane), and is also connected to the first side 2-1 and the second side 2-1' of the surrounding plate at its arc edge (or narrow arc surface), and is connected to the first end 2-4 and the second end 2-4' of the surrounding plate at its second straight edge (or narrow plane) and the third straight edge (or narrow plane). Similar to Embodiment 5, the first side portion 2-1 and the second side portion 2-1' respectively cooperate with the inner wall of the valve body 1 at the corresponding position, and the first end portion 2-4 and the second end portion 2-4' respectively cooperate with the sealing surfaces 7-1 and 7-1' of the valve seat.

[0031] The above embodiments are only some embodiments of the present invention, and not all embodiments. Based on this, any technical solution obtained by those skilled in the art, within the scope of the technology disclosed in this invention, through equivalent substitution or modification of the technical solution and inventive concept of the present invention without creative effort, should be covered within the protection scope of this invention.

Claims

1. A valve plate, on which a valve stem is fixed, the valve plate having a surrounding plate; the surrounding plate is arranged around the inner side of the valve body and cooperates with the sealing surface of the corresponding position of the inner side wall of the valve body or the valve seat; characterized in that: the surrounding plate comprises a first side portion and a second side portion which are symmetrical with respect to the valve stem, and a first end portion and a second end portion which are along the axial direction of the valve stem; wherein the upper edge of the first side portion which cooperates with the inner side wall of the valve body, the lower edge of the second side portion which cooperates with the inner side wall of the valve body, and the central axis of the valve stem are located in a first plane; the lower edge of the first side portion which cooperates with the inner side wall of the valve body, the upper edge of the second side portion which cooperates with the inner side wall of the valve body, and the central axis of the valve stem are located in a second plane; in the fully closed state of the valve, the first plane is perpendicular to the inner side wall of the valve body, and the second plane has an included angle β with respect to the first plane in the opening direction of the valve; or, the second plane is perpendicular to the inner side wall of the valve body, and the first plane has an included angle β with respect to the second plane in the opening direction of the valve; wherein, 0 < β < 90°.

2. The valve plate according to claim 1, characterized in that: the valve plate comprises an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are fixedly connected with or integrally formed with the surrounding plate to form a box structure, and the central axis of the valve stem is located on the middle cross section of the box structure.

3. The valve plate according to claim 1, characterized in that: the valve plate comprises a turning plate, the turning plate is arranged symmetrically with respect to the valve stem and is surrounded by the surrounding plate in the middle; the surrounding plate is fixedly connected with the valve stem and is integrally formed or fixedly connected with the turning plate to form a frame structure.

4. A butterfly valve using the valve plate according to claim 1.

5. A butterfly valve using the valve plate according to claim 2.

6. A butterfly valve using the valve plate according to claim 3.

7. The butterfly valve according to any one of claims 4-6, characterized in that: the valve body of the butterfly valve has a square tube type inner cavity structure, and the inner side walls are parallel to each other in pairs; the first side portion and the second side portion of the valve plate are parallel to each other.

8. The butterfly valve according to any one of claims 4-6, characterized in that: the valve body of the butterfly valve has a circular tube type inner cavity structure.

9. The butterfly valve according to any one of claims 4-6, characterized in that: the inner side wall of the valve body at the position cooperating with the valve plate is fixed with a heat preservation lining.

10. The butterfly valve according to any one of claims 4-6, characterized in that: a soft sealing structure is arranged on the circumferential surface of the valve plate.

11. The butterfly valve according to claim 10, characterized in that: the soft sealing structure comprises a soft sealing ring.

12. The butterfly valve according to claim 11, characterized in that: the material of the soft sealing ring is one of polytetrafluoroethylene, graphite, mica, ceramic fiber, and rubber.

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