Flue butterfly valve structure

Abstract

The utility model discloses a flue butterfly valve structure which comprises a valve body, a valve cavity is formed in the valve body, a valve shaft is arranged in the valve cavity in a penetrating mode, a butterfly plate assembly is arranged on the valve shaft, and a first sealing ring capable of being connected with the butterfly plate assembly in an abutting mode is arranged on the inner wall of the circumference of the valve cavity. The check valve is characterized in that a sinking groove is formed in one side of the valve body along the edge contour of the valve cavity, a cover plate capable of reciprocating in the depth direction of the sinking groove is arranged in the sinking groove, the first sealing ring is clamped between the cover plate and the sinking groove, and a pressing component capable of moving along with the cover plate to abut against and compress the peripheral diameter of the first sealing ring is arranged in the sinking groove. A transmission component capable of driving the cover plate to rotate along with the valve shaft to move synchronously is arranged on the valve body. When the butterfly plate assembly is in a valve cavity opening state, the butterfly plate assembly and the inner side of the first sealing ring are in a non-contact state, and therefore the problem of abrasion and leakage caused by long-term continuous contact and friction of the first sealing ring is effectively solved.

Description

Technical Field

[0001] The utility model relates to a flue butterfly valve structure. Background Art

[0002] For current flue butterfly valves, the leakage rates are relatively high. According to Article 4.2.2 of the latest Machinery Industry Standard JB / T8692 - 2013 of the People's Republic of China, the leakage of a butterfly valve is expressed by the leakage rate, which is the ratio of the actual leakage volume to the maximum flow rate of the valve. It is divided into four grades: A, B, C, and D. Among them, the A grade has the lowest leakage rate, and its leakage rate is not greater than 0.3%.

[0003] Existing butterfly valves usually use a rubber ring and a disc flap to cooperate with each other to achieve the sealing of the butterfly valve. However, during the long-term use of the butterfly valve, due to the continuous contact and friction between the disc flap and the rubber ring, the rubber ring is severely worn, the service life is shortened, and thus the leakage risk is easily aggravated, which cannot meet the use requirements. Summary of the Utility Model

[0004] Aiming at the defects existing in the above-mentioned prior art, the technical problem to be solved by the utility model is to provide a butterfly valve structure with convenient disassembly and assembly of the seal.

[0005] A flue butterfly valve structure includes a valve body. A valve cavity is formed inside the valve body. A valve shaft penetrates through the valve cavity. A butterfly plate assembly is arranged on the valve shaft. A first sealing ring that can be abutted against the butterfly plate assembly is arranged along the circumferential inner wall of the valve cavity. A sink is arranged on one side of the valve body along the edge contour of the valve cavity. A cover plate that can reciprocally move along its depth is arranged in the sink. The first sealing ring is clamped between the cover plate and the sink. And a pressing member that can press and compress the outer diameter of the first sealing ring as the cover plate moves is arranged in the sink. A transmission member that can drive the cover plate to move synchronously as the valve shaft rotates is arranged on the valve body.

[0006] In one embodiment, the transmission member includes a gear concentrically arranged on the valve shaft and a rack arranged on one side of the cover plate. An installation groove is concavely arranged on one side of the sink. The gear is located in the installation groove and fixedly connected to the valve shaft. The rack is arranged in the installation groove and meshes with the gear. When the butterfly plate assembly rotates with the valve shaft to open the valve cavity, the cover plate is in a loose state away from the first sealing ring. When the butterfly plate assembly rotates with the valve shaft to seal the valve cavity, the cover plate abuts against the pressing member.

[0007] In one embodiment, the pressing member includes an inclined surface arranged on the side of the cover plate close to the bottom wall of the sink. A plurality of slider pressing plates are arranged at intervals along the circumference on the bottom wall of the sink on the outer peripheral side of the first sealing ring. The slider pressing plates can move closer to or away from the center of the valve cavity, and one end of the slider pressing plate abuts against the inclined surface.

[0008] In one embodiment, a plurality of sliding grooves are concavely formed along the circumferential direction of the bottom wall of the sunk groove, and a plurality of slider pressing plates are movably arranged in the plurality of sliding grooves in a one-to-one correspondence.

[0009] In one embodiment, a second sealing ring capable of abutting against the outer peripheral side of the cover plate is arranged on the inner side wall of the sunk groove.

[0010] In one embodiment, an anti-corrosion outer plate is arranged on one side of the butterfly plate assembly.

[0011] In one embodiment, the inner diameter of the first sealing ring is larger than the diameter of the butterfly plate assembly, and the difference between the two is 0.1 mm to 1 mm.

[0012] In summary, the beneficial effects of the present utility model compared with the prior art are as follows:

[0013] Through the mutual transmission and linkage between the valve shaft, the cover plate, the pressing member and the transmission member, when the valve shaft is driven to rotate to drive the butterfly plate assembly to be in the state of opening the valve cavity, the pressing member is driven to be in a state of loosening and canceling the pressing against the outer peripheral side of the first sealing ring. Furthermore, the first sealing ring restores its initial diameter size under the action of its own elastic deformation, and the butterfly plate assembly is in a non-contact state with the inner side of the first sealing ring when it is in the state of opening the valve cavity, thereby effectively avoiding the wear and leakage problems caused by the long-term continuous contact and friction of the first sealing ring;

[0014] When the valve shaft is driven to rotate to drive the butterfly plate assembly to be in the state of closing the valve cavity, the pressing member is driven by the transmission to press against the outer peripheral side of the first sealing ring. Furthermore, the first sealing ring is compressed and deformed under the pressure of the pressing member on its outer peripheral side and is in a compressed diameter state, so that the first sealing ring can maintain a tightly fitting sealing state with the butterfly plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic cross-sectional structure view of A-A in one embodiment of the present utility model; Figure 4 is a schematic enlarged view of A in one embodiment of the present utility model;

[0016] Figure 2 is a schematic three-dimensional structure view of a flue butterfly valve structure in one embodiment of the present utility model; Figure 1 is a front view of a flue butterfly valve structure in one embodiment of the present utility model;

[0017] Figure 3 is a schematic cross-sectional structure view of B-B in one embodiment of the present utility model;

[0018] Figure 4 is a schematic cross-sectional structure view of B-B in one embodiment of the present utility model;

[0019] Figure 5 is a schematic cross-sectional structure view of B-B in one embodiment of the present utility model; Figure 4 is a schematic cross-sectional structure view of B-B in one embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0021] As Figures 1 to 5 shown, the embodiment of the present utility model preferably provides a flue damper structure, including a valve body 1. A valve cavity 2 is formed inside the valve body 1. A valve shaft 3 is disposed through the valve cavity 2. A butterfly plate assembly 4 is disposed on the valve shaft 3. A first sealing ring 5 capable of abutting against the butterfly plate assembly 4 is disposed along the inner wall of the valve cavity 2 in a circumferential direction. A sunk groove 6 is disposed on one side of the valve body 1 along the edge contour of the valve cavity 2. A cover plate 7 capable of reciprocatingly moving along its depth is disposed in the sunk groove 6. The first sealing ring 5 is clamped between the cover plate 7 and the sunk groove 6. A pressing member 8 capable of pressing and compressing the outer diameter of the first sealing ring 5 as the cover plate 7 moves is disposed in the sunk groove 6. A transmission member 9 capable of driving the cover plate 7 to move synchronously with the rotation of the valve shaft 3 is disposed on the valve body 1.

[0022] Specifically, through the mutual transmission and linkage among the valve shaft, the cover plate, the pressing member and the transmission member, when the valve shaft is driven to rotate to drive the butterfly plate assembly to be in a state of opening the valve cavity, the pressing member is driven to be in a state of loosening and canceling the abutting pressure against the outer side of the first sealing ring. Further, the first sealing ring restores its initial diameter size under the action of its own elastic deformation. When the butterfly plate assembly is in a state of opening the valve cavity, it is in a non-contact state with the inner side of the first sealing ring, thereby effectively avoiding the wear and leakage problems caused by the long-term continuous contact and friction of the first sealing ring;

[0023] When the valve shaft is driven to rotate to drive the butterfly plate assembly to be in a state of closing the valve cavity, the pressing member is driven by the transmission to abut against the outer side of the first sealing ring. Further, the first sealing ring is compressed and deformed under the pressure of the pressing member on its outer side and is in a state of compressed diameter. Thus, the first sealing ring can maintain a tightly fitting sealing state with the butterfly plate assembly.

[0024] Furthermore, the transmission member 9 includes a gear 91 concentrically disposed on the valve shaft 3 and a rack 92 disposed on one side of the cover plate 7. An installation groove 93 is concavely disposed on one side of the sunk groove 6. The gear 91 is located in the installation groove 93 and is fixedly connected to the valve shaft 3. The rack 92 is disposed in the installation groove 93 and meshes with the gear 91. When the butterfly plate assembly 4 rotates with the valve shaft 3 to be in a state of opening the valve cavity 2, the cover plate 7 is in a loosening state away from the first sealing ring 5. When the butterfly plate assembly 4 rotates with the valve shaft 3 to be in a state of sealing the valve cavity, the cover plate 7 abuts against the pressing member 8.

[0025] Specifically, when the valve shaft is driven to rotate relative to the valve body, the gear rotates synchronously with the valve shaft, and then drives the cover plate to move along the depth direction of the sinking groove through the rack. Further, when the butterfly plate assembly rotates with the valve shaft to be in a state of opening the valve cavity, the cover plate is in a loose state away from the first sealing ring. When the butterfly plate assembly rotates with the valve shaft to be in a state of sealing the valve cavity, the cover plate moves and presses against the pressing member, thereby driving the pressing member to tightly press against the outer peripheral side of the first sealing ring, causing the diameter of the first sealing ring to be integrally compressed and in a sealing state of being closely attached to the butterfly plate assembly.

[0026] Further, the pressing member 8 includes an inclined surface 81 provided on one side of the cover plate 7 close to the bottom wall of the sinking groove 6. A plurality of slider pressing plates 82 are arranged at intervals along the circumference on the bottom wall of the sinking groove 6 on the outer peripheral side of the first sealing ring 5. The slider pressing plates 82 can move closer to or away from the center of the valve cavity 2, and one end of the slider pressing plate 82 abuts against the inclined surface 81. Specifically, by moving the cover plate, the inclined surface of the cover plate presses against one end of a plurality of slider pressing plates, and then drives a plurality of slider pressing plates to synchronously gather towards the center of the valve cavity, so as to realize the pressing against the outer peripheral side of the first sealing ring, causing its overall diameter to deform and compress.

[0027] Further, a plurality of sliding grooves 83 are concavely formed along the circumference on the bottom wall of the sinking groove 6, and a plurality of slider pressing plates 82 are correspondingly and movably arranged in the plurality of sliding grooves 83.

[0028] Further, a second sealing ring (not marked in the figure) capable of abutting against the outer peripheral side of the cover plate 7 is provided on the inner side wall of the sinking groove 6. Further, the sealed movement of the cover plate relative to the sinking groove is realized.

[0029] Further, an anti-corrosion outer plate (not marked in the figure) is provided on one side of the butterfly plate assembly 4. Further, the corrosion resistance of the butterfly plate assembly is effectively enhanced, and the service life is enhanced.

[0030] Further, the inner diameter of the first sealing ring 5 is larger than the diameter of the butterfly plate assembly 4, and the difference therebetween is 0.1 mm to 1 mm. Further, when the first sealing ring elastically returns to the initial state, its inner side is in a non-contact state with the butterfly plate assembly. And preferably, the difference between the inner diameter of the first sealing ring and the diameter of the butterfly plate assembly is controlled between 0.1 mm and 1 mm.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A flue butterfly valve structure, comprising a valve body (1), a valve cavity (2) formed in the valve body (1), a valve shaft (3) penetrating the valve cavity (2), a butterfly plate assembly (4) arranged on the valve shaft (3), a first sealing ring (5) capable of abutting against the butterfly plate assembly (4) arranged along the circumferential inner wall of the valve cavity (2), characterized in that: A recessed groove (6) is provided on one side of the valve body (1) along the edge contour of the valve cavity (2); a cover plate (7) is provided in the recessed groove (6) and can reciprocate along the depth of the recessed groove; the first sealing ring (5) is clamped between the cover plate (7) and the recessed groove (6); a pressing component (8) is provided in the recessed groove (6) and can press and compress the outer diameter of the first sealing ring (5) as the cover plate (7) moves; and a transmission component (9) is provided on the valve body (1) and can drive the cover plate (7) to move synchronously with the rotation of the valve shaft (3).

2. A flue butterfly valve structure according to claim 1, characterized in that: The transmission component (9) comprises a gear (91) coaxially arranged on the valve shaft (3) and a rack (92) arranged on one side of the cover plate (7); a mounting groove (93) is recessed on one side of the sink groove (6); the gear (91) is located in the mounting groove (93) and is fixedly connected to the valve shaft (3); the rack (92) is arranged in the mounting groove (93) and meshes with the gear (91), so that when the butterfly plate assembly (4) rotates with the valve shaft (3) and is in a state of opening the valve cavity (2), the cover plate (7) is in a loose state away from the first sealing ring (5); when the butterfly plate assembly (4) rotates with the valve shaft (3) and is in a state of sealing the valve cavity, the cover plate (7) is pressed against the pressing component (8).

3. A flue butterfly valve structure according to claim 2, characterized in that: The pressing component (8) includes an inclined surface (81) arranged on the side of the cover plate (7) close to the bottom wall of the sink groove (6); the bottom wall of the sink groove (6) is located on the outer peripheral side of the first sealing ring (5) and is provided with a plurality of slider pressure plates (82) at intervals along the circumference; the slider pressure plate (82) can move closer to or away from the center of the valve cavity (2), and one end of the slider pressure plate (82) abuts against the inclined surface (81).

4. A flue butterfly valve structure according to claim 1, characterized in that: The bottom wall of the sink (6) is concavely provided with a plurality of slide grooves (83) along the circumference, and a plurality of slider pressure plates (82) are movably arranged in the plurality of slide grooves (83) in a one-to-one corresponding manner.

5. The flue butterfly valve structure according to claim 1, characterized in that: The inner side wall of the sink (6) is provided with a second sealing ring capable of abutting against the outer peripheral side of the cover plate (7).

6. A flue butterfly valve structure according to claim 1, characterized in that: An anti-corrosion outer plate is provided on one side of the butterfly plate assembly (4).

7. The flue butterfly valve structure according to claim 1, characterized in that: The inner diameter of the first sealing ring (5) is greater than the diameter of the butterfly plate assembly (4), and the difference between the inner diameter and the diameter is 0.1 mm to 1 mm.

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