Soft-sealed flue valve

Abstract

The present invention belongs to the technical field of flue valves, and particularly relates to a soft-sealing flue valve, which includes a valve body, a valve stem and a valve plate. The valve body is provided with a valve cavity, and the valve body is provided with a through hole penetrating inside and outside the valve cavity. The valve stem passes through the through hole on the valve body and is connected to the valve plate in the valve cavity, driving the valve plate to rotate around the axis of the valve stem. The valve plate is provided with a first mating surface, the inner wall of the valve cavity is provided with a second mating surface, and the valve plate is provided with a soft-sealing body protruding from the first mating surface. The soft-sealing body is continuously arranged along the circumferential direction of the valve plate on the first mating surface. In the closed state of the flue valve, the soft-sealing body on the valve plate is sealingly abutted against the second mating surface, separating the valve cavity into two parts. The flue valve of the present invention does not require a double-eccentric or triple-eccentric structure design, the overall structure is relatively simple, and the manufacturing cost is saved; the detachable setting of the soft-sealing body and the valve plate only requires replacing the soft-sealing body after the seal fails, without the need to repair the valve plate, which is convenient for maintenance, has a short maintenance cycle and low maintenance cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of flue valves, and particularly relates to a soft-sealed flue valve. Background Art

[0002] Existing large-diameter pipeline valves are mainly hard-sealed valves, which rely on the direct contact between a hard butterfly plate and a hard valve seat to form a hard seal. When the two surfaces of the hard seal come into contact with each other, they are prone to bumping. And for a sealed contact, elastic extrusion is required between the two contact surfaces. However, the elasticity of the hard seal is limited. After the valve is opened and closed multiple times, the two contact surfaces are likely to deform, resulting in a significant reduction in the sealing performance of the valve and affecting the use effect of the sealed valve. To avoid the premature failure of the sealing performance of the hard-sealed valve, double-eccentric or triple-eccentric valves are generally used, which leads to a complex structure of the entire valve. And due to the limited elasticity of the hard-sealed contact surface, it is still difficult to avoid the deformation of the valve plate and the reduction of the sealing performance after the structure is changed.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above deficiencies in the prior art. Summary of the Invention

[0004] The purpose of the present invention is to provide a soft-sealed flue valve to at least solve the problem that the sealing performance of large-diameter pipeline valves decreases after being used for a period of time.

[0005] To achieve the above purpose, the present invention provides the following technical solution:

[0006] A soft-sealed flue valve, the flue valve includes a valve body, a valve stem and a valve plate. The valve body is provided with a valve cavity, and the valve body is provided with a through hole penetrating inside and outside the valve cavity. The valve stem passes through the through hole on the valve body and is connected to the valve plate in the valve cavity, driving the valve plate to rotate around the axis of the valve stem. A first mating surface is provided in the radial direction of the valve plate, a second mating surface is provided on the inner wall of the valve cavity, and a soft seal body protruding from the first mating surface is provided on the valve plate. The soft seal body is continuously arranged along the circumferential direction of the valve plate on the first mating surface. In the closed state of the flue valve, the soft seal body on the valve plate is sealingly abutted against the second mating surface, separating the valve cavity into two parts.

[0007] In the soft-sealed flue valve as described above, as a preferred solution, the valve plate is flat. During the closing process of the valve plate, along the rotation direction of the valve plate, the included angle between the first mating surface and the front side surface of the valve plate is greater than 90°; correspondingly, when the valve plate is closed, the gap between the second mating surface and the first mating surface is uniform.

[0008] In the soft-sealed flue valve described above, as a preferred solution, the two sides of the valve plate are respectively a first side and a second side. The first side is formed by enclosing a first arc portion, a second arc portion, and a straight portion. The first arc portion and the second arc portion have opposite openings and are connected by the straight portion. The centers of the arcs of the first arc portion and the second arc portion coincide. The radius of the first arc portion is r 1 , and the radius of the second arc portion is r 2 , r 1 > r 2 ; the axis of the valve plate is located at the center of the thickness of the valve plate, and the center of the arc of the first arc portion is located on the vertical projection line of the axis of the valve stem on the first side; the first side completely coincides with the second side after rotating 180° around the axis of the valve stem.

[0009] In the soft-sealed flue valve described above, as a preferred solution, an installation groove is provided on the first mating surface along the circumferential direction of the valve plate. The soft seal is installed in the installation groove and protrudes from the first mating surface.

[0010] In the soft-sealed flue valve described above, as a preferred solution, multiple circles of the soft seal are provided, and multiple circles of the soft seal are arranged at intervals. When the flue valve is closed, multiple circles of the soft seal separate at least one sealed chamber between the first mating surface and the second mating surface. Preferably, two circles of the soft seal are provided.

[0011] In the soft-sealed flue valve described above, as a preferred solution, a first ventilation hole is provided in the valve plate. One end of the first ventilation is provided on the first mating surface between two adjacent soft seals. The other end of the first ventilation hole is conducted to the outside of the valve through the valve stem. Preferably, multiple first ventilation holes are provided. One ends of multiple first ventilation holes are evenly distributed along the circumferential direction of the valve plate. Multiple first ventilation holes converge in the valve plate and are conducted to the outside of the valve through the valve stem.

[0012] In the soft-sealed flue valve described above, as a preferred solution, in the flue valve in the closed state, a second ventilation hole penetrating inside and outside the valve body is provided on the second mating surface between two adjacent soft seals; preferably, multiple second ventilation holes are provided, and multiple second ventilation holes are evenly distributed along the circumferential direction of the valve cavity.

[0013] In the soft-sealed flue valve described above, as a preferred solution, the plane formed by the straight portions on the corresponding first side and the second side is perpendicular to the axis of the valve stem, and both the first arc portion and the second arc portion are minor arcs.

[0014] In the soft-sealed flue valve described above, as a preferred solution, during the closing process of the valve plate, along the rotation direction of the valve plate, the included angle between the first mating surface and the front side surface of the valve plate is 91° to 105°.

[0015] In the soft-sealed flue valve described above, as a preferred solution, the minimum radius of the second mating surface along the rotation direction of the valve plate is R w , R w > r 2 .

[0016] Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] For the soft-sealed flue valve provided by the present invention, a soft sealing body protruding from the first mating surface is arranged on the valve plate, thereby ensuring the tightness of the seal and avoiding the problem of seal failure caused by long-term use; by adopting the inclined first mating surface and the second mating surface, the flue valve of the present invention does not need to be designed with a double-eccentric or triple-eccentric structure, and the overall structure is relatively simple, saving manufacturing costs; by arranging multiple circles of soft sealing bodies at intervals and introducing a gas with a preset pressure between two adjacent circles of soft sealing bodies, the entire flue valve can maintain good sealing performance when the pressures at both ends are not equal, avoiding damage to the soft sealing body due to lateral force. The detachable setting of the soft sealing body and the valve plate only requires replacing the soft sealing body after seal failure, without the need to repair the valve plate, which is convenient for maintenance, has a short maintenance cycle, and low maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The schematic diagrams in the specification forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0019] Figure 1 is a schematic structural diagram of the flue valve according to an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of the valve plate according to an embodiment of the present invention;

[0021] Figure 3 is a cross-sectional view of the valve plate in the closed state according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the movement of the valve plate in the valve body according to an embodiment of the present invention.

[0023] In the figure: 1, valve body; 2, valve stem; 3, valve plate; 4, valve cavity; 5, first mating surface; 6, second mating surface; 7, soft sealing body; 8, first ventilation hole; 9, second ventilation hole; 10, first side surface; 11, first arc portion; 12, second arc portion; 13, straight portion. Detailed implementation mode

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0025] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and does not require the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] According to an embodiment of the present invention, as Figures 1 to 4 shown, the present invention provides a soft-sealed flue valve. The flue valve includes a valve body 1, a valve stem 2 and a valve plate 3. The valve body 1 is provided with a valve cavity 4. The valve body 1 is provided with a through hole penetrating inside and outside the valve cavity 4. The valve stem 2 passes through the through hole on the valve body 1 and is connected to the valve plate 3 in the valve cavity 4, driving the valve plate 3 to rotate around the axis of the valve stem 2. A first mating surface 5 is provided in the radial direction of the valve plate 3. A second mating surface 6 is provided on the inner wall of the valve cavity 4. A soft seal body 7 protruding from the first mating surface 5 is provided on the valve plate 3. The soft seal body 7 is continuously arranged along the circumferential direction of the valve plate 3 on the first mating surface 5. In the closed state of the flue valve, the soft seal body 7 on the valve plate 3 is sealed against the second mating surface 6, separating the valve cavity 4 into two parts, realizing the sealing of the flue valve. Figure 1 and Figure 3 The arrows in indicate the direction of the sealing gas introduced below.

[0027] When in use, the soft seal body 7 is used between the first mating surface 5 and the second mating surface 6 to realize the sealing of the entire flue valve. Since the material of the soft seal body 7 is an elastic material, it has elasticity and can still maintain good sealing performance during the repeated opening and closing of the flue valve.

[0028] Furthermore, the valve plate 3 is in a flat plate shape. As Figure 4 shown, during the closing process of the valve plate 3, along the rotation direction of the valve plate 3, the included angle α between the first mating surface 5 and the front side surface of the valve plate 3 is greater than 90°, so as to Figure 4As shown in the figure, the included angle between the first mating surface 5 on the left side of the valve stem 2 and the upper surface of the valve plate 3 is α, and the included angle between the first mating surface 5 on the right side of the valve stem 2 and the lower surface of the valve plate 3 is α, making the first mating surface 5 present an "inclined plane". Correspondingly, after the valve plate 3 is closed, the gap between the second mating surface 6 and the first mating surface 5 is uniform, and the distance between any corresponding points on the first mating surface 5 and the second mating surface 6 is equal; thus, the second mating surface 6 also presents an "inclined plane" corresponding to the first mating surface 5. During use, the design of the two inclined planes can prevent the valve plate 3 from interfering with the second mating surface 6 during the closing process. At the same time, the design of the inclined plane also squeezes the soft sealing body 7 (such as rubber and other materials that can achieve sealing and meet the requirements of the use conditions) provided on the first mating surface 5 onto the second mating surface 6. Through the extrusion deformation of the soft sealing body 7, close contact with the second mating surface 6 is achieved, thereby realizing the sealed closing of the flue valve.

[0029] After the flue valve is closed, the distance between the first mating surface 5 and the second mating surface 6 is less than the length of the soft sealing body 7 extending out of the surface of the first mating surface 5, ensuring that after the flue valve is closed, the compression of the soft sealing body 7 can be satisfied without damaging the soft sealing body 7.

[0030] Furthermore, since the extrusion force of the soft sealing body 7 comes from the torque transmission of the valve stem 2, the larger the value of α, the greater the torque of the valve stem 2 required to cause the same deformation of the soft sealing body 7, and as the valve plate 3 is the force transmission medium, the higher the strength requirement for it. Therefore, α cannot be too large; however, when α is too small (too close to 90°, such as 90.1°), since the first mating surface 5 is basically perpendicular to the plane of the valve plate 3, during the design of the flue valve, it is necessary to consider whether the valve plate 3 will interfere with the second mating surface 6 during the closing process of the flue valve, and the soft sealing body 7 will not be extruded during the closing process of the flue valve and thus cannot achieve sealing. In this embodiment, α is 91° to 105°.

[0031] Furthermore, the two sides of the valve plate 3 are respectively the first side 10 and the second side. As Figure 2 shown, the first side 10 is enclosed by a first arc portion 11, a second arc portion 12, and a straight portion 13. The first arc portion 11 and the second arc portion 12 have opposite openings and are connected by the straight portion 13. The center of the first arc portion 11 coincides with the center of the second arc portion 12; the radius of the first arc portion 11 is r 1 , the radius of the second arc portion 12 is r 2 , r 1 > r 2 , so that the valve stem can be arranged without eccentricity relative to the valve plate, avoiding interference between the first arc portion and the valve plate. According to Figure 2From the perspective of the orientation of the middle valve plate 3, the first side 10 refers to the upper surface of the valve plate, and the second side refers to the lower surface of the valve plate. The axis of the valve stem 2 is located at the thickness center of the valve plate 3, that is, the valve stem 2 is not eccentrically arranged relative to the valve plate. The center of the arc of the first arc portion 11 is located on the vertical projection line of the axis of the valve stem 2 on the first side 10; after the first side 10 rotates 180° around the axis of the valve stem, it completely coincides with the second side. The portion between the corresponding first arc portion 11 and the second arc portion 12 on the valve plate 3 on the same side of the valve stem 2 forms the first mating surface 5 of the valve plate 3, and this surface is a conical inclined surface, that is, the first mating surface 5 is the conical surface formed between the first arc portion 11 and the second arc portion 12 below it.

[0032] Further, the minimum radius of the second mating surface 6 along the rotation direction of the valve plate 3 is R w , and this R w is equal to the minimum distance from the axis center of the valve stem 2 to the second mating surface 6 in the central plane perpendicular to the axis. In order to avoid interference between the valve plate 3 and the second mating surface 6 during the closing process of the flue gas valve, R w > r 2 .

[0033] Further, the plane formed by the straight portions 13 on the corresponding first side 10 and the second side is perpendicular to the axis of the valve stem 2, and both the first arc portion 11 and the second arc portion 12 are minor arcs. During the rotation of the valve plate 3, the soft seal 7 on the plane formed by the straight portions 13 on the corresponding first side 10 and the second side is always in elastic contact with the valve body 1.

[0034] Further, an installation groove is provided on the first mating surface 5 along the circumferential direction of the valve plate 3, and the soft seal 7 is installed in the installation groove and protrudes from the first mating surface 5. In a specific embodiment of the present invention, the soft seal 7 can be in a ring shape. When in use, a ring-shaped soft seal 7 with a suitable size is sleeved and installed in the installation groove on the first mating surface 5.

[0035] Further, multiple circles of soft seals 7 are provided, and the multiple circles of soft seals 7 are arranged at intervals. When the flue gas valve is closed, the multiple circles of soft seals 7 separate at least one sealed chamber between the first mating surface 5 and the second mating surface 6; preferably, two circles of soft seals 7 are provided.

[0036] Further, a first ventilation hole 8 is provided in the valve plate 3. One end of the first ventilation hole is disposed on the first mating surface 5 between two adjacent soft seal bodies 7, and the other end of the first ventilation hole 8 is conducted to the outside of the valve body 1 through the valve stem 2. Preferably, a plurality of first ventilation holes 8 are provided. One ends of the plurality of first ventilation holes 8 are evenly distributed along the circumference of the valve plate 3. The plurality of first ventilation holes 8 converge within the valve plate 3 and are conducted to the outside of the valve body 1 through the valve stem 2. A first valve (not shown in the figure) is provided at the first ventilation hole 8 on the valve stem 2, and the opening and closing of the first ventilation hole 8 can be achieved through the first valve. After the flue valve is closed, a sealing gas with a preset pressure can be injected into the closed space between two adjacent soft seal bodies 7 through the first ventilation hole 8 on the valve stem 2. This operation is used for the case where there is a pressure difference on both sides of the valve. The pressure of the sealing gas is the intermediate value of the pressures on both sides. This method can reduce the pressure difference on both sides of the soft seal body 7, reduce the lateral force on the soft seal body 7, and avoid lateral deformation. For example, if the pressures on both sides of the valve plate 3 are 0.3 Mpa and 0.5 Mpa respectively, the pressure of the injected gas can be 0.4 Mpa.

[0037] In other embodiments of the present invention, the above-mentioned first ventilation hole 8 may not be provided, and a second ventilation hole 9 may be provided on the valve body 1. Specifically: in the flue valve in the closed state, a second ventilation hole 9 penetrating through the inside and outside of the valve body 1 is provided on the second mating surface 6 between two adjacent soft seal bodies 7; a valve is provided at the opening of the second ventilation hole 9 outside the valve body 1. Preferably, a plurality of second ventilation holes 9 are provided, and the plurality of second ventilation holes 9 are evenly distributed along the circumference of the valve cavity 4. Since the valve body 1 remains stationary during the entire use process of the flue valve, setting the second ventilation hole 9 on the valve body 1 is relatively simpler in operation compared to setting the first ventilation hole 8 on the valve plate 3 and the valve stem 2. In still other embodiments of the present invention, the above-mentioned first ventilation hole 8 and the above-mentioned second ventilation hole 9 may also be provided simultaneously. Their functions are all to introduce gas into the closed space between two adjacent soft seal bodies 7, and the pressure of the introduced gas is the same as the above requirements, which will not be elaborated here.

[0038] In summary, the soft-sealed flue valve provided by the present invention has a soft seal body protruding from the first mating surface on the valve plate, thereby ensuring the tightness of the seal and avoiding the problem of seal failure caused by long-term use; by adopting the inclined first mating surface and the second mating surface, the flue valve of the present invention does not require a double-eccentric or triple-eccentric structure design, the overall structure is relatively simple, and the manufacturing cost is saved; by providing multiple circles of soft seal bodies arranged at intervals and introducing a gas with a preset pressure between two adjacent circles of soft seal bodies, the entire flue valve can maintain good sealing performance when the pressures at both ends are not equal, and avoid damage to the soft seal body due to lateral force. The detachable setting of the soft seal body and the valve plate only requires replacing the soft seal body after seal failure, without the need to repair the valve plate, which is convenient for maintenance, has a short maintenance cycle, and low maintenance cost.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A soft-sealed flue valve, characterized in that, the flue valve comprises a valve body, a valve stem and a valve plate. The valve body is provided with a valve cavity, and the valve body is provided with a through hole penetrating inside and outside the valve cavity. The valve stem passes through the through hole on the valve body and is connected to the valve plate in the valve cavity, driving the valve plate to rotate around the axis of the valve stem. A first mating surface is provided on the radial direction of the valve plate, a second mating surface is provided on the inner wall of the valve cavity, and a soft sealing body protruding from the first mating surface is provided on the valve plate. The soft sealing body is continuously arranged along the circumferential direction of the valve plate on the first mating surface. In the closed state of the flue valve, the soft sealing body on the valve plate is sealingly abutted against the second mating surface, separating the valve cavity into two parts; The two sides of the valve plate are respectively a first side and a second side. The first side is enclosed by a first arc portion, a second arc portion and a straight portion. The first arc portion and the second arc portion have opposite openings and are connected by the straight portion. The center of the arc of the first arc portion coincides with the center of the arc of the second arc portion; the radius of the first arc portion is r1, the radius of the second arc portion is r2, and r1 > r2; The soft sealing body is provided with multiple turns, and the multiple turns of the soft sealing body are arranged at intervals. When the flue valve is closed, the multiple turns of the soft sealing body space out at least one sealed chamber between the first mating surface and the second mating surface; A first ventilation hole is arranged inside the valve plate. One end of the first ventilation hole is arranged on the first mating surface between two adjacent soft sealing bodies, and the other end of the first ventilation hole is conducted to the outside of the valve body through the valve stem; after the flue valve is closed, a sealing gas with a preset pressure is injected into the sealed chamber between two adjacent soft sealing bodies through the first ventilation hole on the valve stem. This operation is used for the situation where there is a pressure difference on both sides of the valve, and the pressure of the sealing gas is the intermediate value of the pressures on both sides.

2. The soft-sealed flue valve according to claim 1, characterized in that, the valve plate is in a flat shape. During the closing process of the valve plate, along the rotation direction of the valve plate, the included angle between the first mating surface and the front side surface of the valve plate is greater than 90°; correspondingly, when the valve plate is closed, the gap between the second mating surface and the first mating surface is uniform.

3. The soft-sealed flue valve according to claim 2, characterized in that, the axis of the valve plate is located at the center of the thickness of the valve plate, and the center of the arc of the first arc portion is located on the perpendicular projection line of the axis of the valve stem on the first side surface; the first side surface coincides completely with the second side surface after rotating 180° around the axis of the valve stem.

4. The soft-sealed flue valve according to claim 1, characterized in that, an installation groove is arranged on the first mating surface along the circumferential direction of the valve plate, and the soft sealing body is installed in the installation groove and protrudes from the first mating surface.

5. The soft-sealed flue valve according to claim 1 or 4, characterized in that, the soft sealing body is provided with two turns.

6. The soft-sealed flue valve according to claim 5, characterized in that, The first ventilation holes are provided in plurality, one ends of the plurality of first ventilation holes are circumferentially distributed along the circumference of the valve plate, the plurality of first ventilation holes converge within the valve plate, and are conducted to the outside of the valve body through the valve stem.

7. The soft-sealed flue valve according to claim 5, characterized in that in the flue valve in the closed state, second ventilation holes penetrating inside and outside the valve body are provided on the second mating surface between two adjacent soft-sealing bodies.

8. The soft-sealed flue valve according to claim 7, characterized in that the second ventilation holes are provided in plurality, and the plurality of second ventilation holes are circumferentially distributed along the circumference of the valve cavity.

9. The soft-sealed flue valve according to claim 3, characterized in that the plane formed by the straight portions on the corresponding first side surface and the second side surface is perpendicular to the axis of the valve stem, and both the first arc portion and the second arc portion are minor arcs.

10. The soft-sealed flue valve according to claim 2, characterized in that during the closing process of the valve plate, along the rotation direction of the valve plate, the included angle between the first mating surface and the front side surface of the valve plate is 91° to 105°.

11. The soft-sealed flue valve according to claim 3, characterized in that The minimum radius of the second mating surface along the rotation direction of the valve plate is R w , R w >r 2 .

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