A low-pressure, low-load, low-cost, zero-leakage flue gas valve

Abstract

The utility model discloses a low-pressure, low-load, low-cost, zero-leakage flue gas valve, which relates to the technical field of flue gas valves, including a valve body, a first sleeve, a second sleeve, a shaft sleeve, a valve stem, a valve plate, a connecting portion and a sealing ring. The first sleeve and the second sleeve are coaxially and vertically arranged on the upper and lower sides of the valve body, and the first sleeve and the second sleeve are both provided with shaft sleeves, and the two ends of the valve stem are respectively connected to one of the shaft sleeves. A valve plate is provided in the valve body, and a connecting portion is eccentrically provided on one side of the valve plate, and the connecting portion is connected to the valve stem. An annular groove is also provided on the circumferential surface of the valve plate, and a sealing ring is provided in the annular groove. The low-pressure, low-load, low-cost, zero-leakage flue gas valve proposed by the utility model adopts a similar double eccentric structure, and the sealing surface of the valve plate is a conical surface, so that the sealing ability is strong and the tighter it is closed, the sealing performance is guaranteed. At the same time, the valve body and the valve plate are processed by welding, and the structure is simple and the processing cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke valves, and more specifically to a low-pressure, low-load, low-cost, zero-leakage smoke valve. Background Art

[0002] Valves at key locations in environmental protection equipment are required to have zero leakage. Currently, valves at this location are usually chemical butterfly valves, but they have the following defects: the eccentricity of chemical butterfly valves is relatively small. Under low pressure difference conditions, the sealing force provided by the medium pressure difference is very small, and the specific pressure of the sealing surface decreases, resulting in a decrease in sealing performance. If the sealing performance is to be guaranteed, the size of the actuator will be increased; the valve body and butterfly plate of the chemical valve are cast, which is relatively expensive. Utility Model Content

[0003] In order to overcome the defects of the prior art, the utility model proposes a low-pressure, low-load, low-cost, zero-leakage flue gas valve, which adopts a similar double eccentric structure, and the valve plate sealing surface is a conical surface, so that the sealing ability is strong and the valve becomes tighter as it is closed, thereby ensuring its sealing performance. At the same time, the valve body and valve plate are made of welding, with a simple structure and low processing cost.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a low-pressure, low-load, low-cost, zero-leakage flue gas valve, comprising a valve body, a first sleeve, a second sleeve, a shaft sleeve, a valve stem, a valve plate, a connecting portion and a sealing ring, wherein the first sleeve and the second sleeve are coaxially and vertically arranged on the upper and lower sides of the valve body, shaft sleeves are arranged in the first sleeve and the second sleeve, and the two ends of the valve stem are respectively connected to one of the shaft sleeves, a valve plate is arranged in the valve body, a connecting portion is eccentrically arranged on one side of the valve plate, and the connecting portion is connected to the valve stem, and an annular groove is also arranged on the circumferential surface of the valve plate, and a sealing ring is arranged in the annular groove.

[0006] In a preferred technical solution of the utility model, the connecting part includes a screw plate and an internally threaded cylindrical pin, the screw plate is sleeved on the valve stem, and one side of the screw plate is welded and fixed to the valve plate, threaded holes are provided on the valve stem and the screw plate, and the internally threaded cylindrical pin is connected to the inner thread of the threaded hole.

[0007] In a preferred technical solution of the utility model, a sealing ring is also provided on the inner wall of the valve body, and the sealing ring is arranged concentrically with the valve plate, the inner wall of the sealing ring is provided with a first conical surface, and a second conical surface is provided on the circumferential surface of the valve plate, and the first conical surface and the second conical surface cooperate with each other.

[0008] In a preferred technical solution of the utility model, the sealing ring is a hollow ring.

[0009] In a preferred technical solution of the utility model, a set screw is further provided on one side of the valve plate, and the conical tip of the set screw abuts against the sealing ring.

[0010] In a preferred technical solution of the utility model, a first sealing member is provided on the first sleeve, and the first sealing member includes a packing pressure plate, a packing pressure sleeve, a graphite packing ring and a sealing gasket which are sequentially sleeved on the valve stem from top to bottom, and the packing pressure sleeve, the graphite packing ring and the sealing gasket are located on the inner side of the first sleeve, and the packing pressure plate is connected to the first sleeve by a first fastening bolt.

[0011] In a preferred technical solution of the utility model, a second seal is provided on the second sleeve, and the second seal includes a split ring, an O-ring, a bottom cover and a second fastening bolt. The bottom cover is connected to the second sleeve by the second fastening bolt, an O-ring is provided between the bottom cover and the second sleeve, and a split ring is also provided between the bottom cover and the sleeve located in the second sleeve, and the split ring is sleeved on the valve stem.

[0012] The beneficial effects of the utility model are:

[0013] 1. Low cost. The valve body is welded from steel plates. The wall thickness of the valve body can be selected according to actual conditions. The selected wall thickness is generally much thinner than that of traditional chemical valves, especially for large-diameter valves, where the cost advantage is more obvious. The valve plate is a double-plate stacked welding structure, which reduces the number of welds, reduces the deformation of the valve plate and ensures the overall strength. Compared with traditional chemical valve butterfly plates, the structure is simple and the weight is reduced.

[0014] 2. Zero leakage. It adopts a similar double eccentric structure, the valve plate sealing surface is made of soft sealing material, and the sealing surface is a conical surface, which has strong sealing ability and becomes tighter as it is closed, ensuring its sealing performance; the sealing ring is a hollow ring with high elasticity, large compressibility, and adjustable sealing position.

[0015] 3. More suitable for low pressure difference working conditions. The large eccentric structure increases the utilization of pressure difference, increases the specific pressure of the sealing surface, and helps to improve the sealing performance.

[0016] 4. Simple sealing ring fixation. The sealing ring of the traditional chemical valve is fixed by a pressure plate and a tightening bolt, which is large and complicated, while the smoke valve of this embodiment is fixed by a locking screw and has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a low-pressure, low-load, low-cost, zero-leakage flue gas valve provided by a specific implementation method of the utility model;

[0018] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0019] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle;

[0020] Figure 4 yes Figure 1 A partial enlarged view of point C in the middle;

[0021] Figure 5 yes Figure 1 Right view of .

[0022] In the figure:

[0023] 1. Valve body; 2. First sleeve; 3. Second sleeve; 4. Bushing; 5. Valve stem; 6. Valve plate; 61. Annular groove; 62. Second cone surface; 63. Set screw; 7. Connecting part; 71. Screw plate; 72. Internal threaded cylindrical pin; 73. Threaded hole; 8. Sealing ring; 9. Sealing ring; 91. First cone surface; 10. First sealing member; 101. Packing pressure plate; 102. Packing pressure sleeve; 103. Graphite packing ring; 104. Sealing gasket; 105. First fastening bolt; 11. Second sealing member; 111. Split ring; 112. O-ring; 113. Bottom cover; 114. Second fastening bolt. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0025] like Figure 1-5As shown, in the embodiment, a low-pressure, low-load, low-cost zero-leakage flue gas valve is provided, including a valve body 1, a first sleeve 2, a second sleeve 3, a sleeve 4, a valve stem 5, a valve plate 6, a connection part 7 and a sealing ring 8. The first sleeve 2 and the second sleeve 3 are coaxially arranged vertically on the upper and lower sides of the valve body 1. The first sleeve 2 and the second sleeve 3 are both provided with a sleeve 4, and the two ends of the valve stem 5 are respectively connected to one of the sleeves 4. A valve plate 6 is provided in the valve body 1, and a connection part 7 is eccentrically provided on one side of the valve plate 6, and the connection part 7 is connected to the valve stem 5. An annular groove 61 is also provided on the circumferential surface of the valve plate 6, and a sealing ring 8 is provided in the annular groove 61. In this embodiment, the valve body 1 is welded with steel plates, and the wall thickness of the valve body 1 can be selected according to actual conditions. The selected wall thickness is generally much thinner than that of traditional chemical valves, especially large-diameter valves have more obvious cost advantages, and a conveying channel for liquid or gas to pass through is provided in the valve body 1. The first sleeve 2 is located at the top of the valve body 1, and the second sleeve 3 is located at the bottom of the valve body 1. The top of the first sleeve 2 is fixedly connected to the bracket by bolts, and the top of the valve stem 5 is rotatably connected to the bracket to provide support for the valve stem 5. When the valve body 1 is processed, it should be ensured that the central axis of the first sleeve 2 and the second sleeve 3 does not intersect with the central axis of the conveying channel, so that the valve stem 5 is eccentrically arranged compared with the valve plate 6. At the same time, since the valve adopts a large eccentric structure, the utilization of the pressure difference is increased, the specific pressure of the sealing surface is increased, and it is helpful to improve the sealing performance. The shaft sleeve 4 is set so that the valve stem 5 can rotate around the central axis of the first sleeve 2 and the second sleeve 3, and then it can drive the valve plate 6 to rotate, open or close the conveying channel, so as to realize the opening and closing function. There are two connecting parts 7, and the two connecting parts 7 are arranged symmetrically up and down along the horizontal center axis of the valve plate 6. The valve plate 6 adopts a double-plate stacking welding structure and reduces the number of welds, which can reduce the deformation of the valve plate 6 and ensure the overall strength. Compared with the traditional chemical valve butterfly plate, the structure is simple and the weight is reduced. The diameter of the sealing ring 8 should be greater than the depth of the annular groove 61 so that the sealing ring 8 will protrude out of the annular groove 61 during installation. The sealing ring 8 is made of elastic material and can adaptively deform when squeezed to achieve a better sealing effect.

[0026] Specifically, the connecting portion 7 includes a screw plate 71 and an internal threaded cylindrical pin 72. The screw plate 71 is sleeved on the valve stem 5, and one side of the screw plate 71 is welded and fixed on the valve plate 6. The valve stem 5 and the screw plate 71 are both provided with threaded holes 73, and the internal threaded cylindrical pin 72 is connected to the internal thread of the threaded hole 73. In this embodiment, the screw plate 71 is a rectangular sleeve, and the screw plate 71 is fixed to the valve plate 6 by welding, so that there is no need to drill holes on the surface of the valve plate 6, and the strength of the valve plate 6 can be ensured. The threaded hole 73 on the valve stem 5 and the threaded hole 73 on the screw plate 71 are arranged concentrically, and the internal threaded cylindrical pin 72 is provided to fix the screw plate 71 to the valve stem 5, so that the valve stem 5 and the valve plate 6 are fixed as a whole.

[0027] Specifically, a sealing ring 9 is further provided on the inner side wall of the valve body 1, and the sealing ring 9 is arranged concentrically with the valve plate 6, a first conical surface 91 is provided on the inner side wall of the sealing ring 9, a second conical surface 62 is provided on the circumferential surface of the valve plate 6, and the first conical surface 91 cooperates with the second conical surface 62. In this embodiment, the sealing ring 9 is used to assist the valve plate 6 in sealing the delivery channel, and the conical surface of the sealing surface has a strong sealing ability and becomes tighter as it is closed, thereby ensuring its sealing performance.

[0028] Specifically, the sealing ring 8 is a hollow ring. In this embodiment, the sealing ring 8 is a hollow ring, which has high elasticity, high compressibility, and adjustable sealing position, thereby ensuring its sealing performance.

[0029] Specifically, a set screw 63 is further provided on one side of the valve plate 6, and the conical tip of the set screw 63 abuts against the sealing ring 8. In this embodiment, the set screw 63 is used to fix the sealing ring 8 in the annular groove 61 to prevent it from sliding, and the use of screw fixation is simple to operate and easy to install.

[0030] Specifically, the first sleeve 2 is provided with a first sealing member 10, which includes a packing plate 101, a packing sleeve 102, a graphite packing ring 103 and a sealing gasket 104, which are sequentially sleeved on the valve stem 5 from top to bottom, and the packing sleeve 102, the graphite packing ring 103 and the sealing gasket 104 are located inside the first sleeve 2, and the packing plate 101 is connected to the first sleeve 2 through a first fastening bolt 105. In this embodiment, the first sealing member 10 is used to seal the gap between the first sleeve 2 and the valve stem 5 to prevent leakage. Among them, the sealing gasket 104 is arranged above the shaft sleeve 4, and the packing sleeve 102, the graphite packing ring 103 and the sealing gasket 104 are all annular structures, and the packing sleeve 102, the graphite packing ring 103 and the sealing gasket 104 cooperate with each other, which can play a role of multiple sealing, and the sealing effect is better. The packing pressing plate 101 is used to fix the packing pressing sleeve 102, the graphite packing ring 103 and the sealing gasket 104 on the inner side of the first sleeve 2 to prevent them from falling off and ensure the sealing ability. It is fixed by bolts and has a simple structure.

[0031] Specifically, the second sleeve 3 is provided with a second seal 11, which includes a split ring 111, an O-ring 112, a bottom cover 113 and a second fastening bolt 114. The bottom cover 113 is connected to the second sleeve 3 through the second fastening bolt 114. An O-ring 112 is provided between the bottom cover 113 and the second sleeve 3. A split ring 111 is also provided between the bottom cover 113 and the shaft sleeve 4 located in the second sleeve 3, and the split ring 111 is sleeved on the valve stem 5. In this embodiment, the second seal 11 is used to seal the gap between the second sleeve 3 and the valve stem 5 to prevent leakage. Among them, the bottom cover 113 is a stepped truncated cone, and a rotation groove is provided on the top of the bottom cover 113. The bottom end of the valve stem 5 is rotatably connected to the rotation groove, so as to support and fix the bottom end of the valve stem 5. The split ring 111, the O-ring 112 and the bottom cover 113 cooperate with each other to seal the bottom end of the second sleeve 3 to ensure the sealing effect.

[0032] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A low-pressure, low-load, low-cost, zero-leakage flue gas valve, characterized by: The invention comprises a valve body (1), a first sleeve (2), a second sleeve (3), a shaft sleeve (4), a valve stem (5), a valve plate (6), a connecting portion (7) and a sealing ring (8); the first sleeve (2) and the second sleeve (3) are coaxially arranged vertically on the upper and lower sides of the valve body (1); the first sleeve (2) and the second sleeve (3) are both provided with shaft sleeves (4); and the two ends of the valve stem (5) are respectively connected to one of the shaft sleeves (4); a valve plate (6) is provided in the valve body (1); a connecting portion (7) is eccentrically provided on one side of the valve plate (6); and the connecting portion (7) is connected to the valve stem (5); an annular groove (61) is also provided on the circumferential surface of the valve plate (6); and a sealing ring (8) is provided in the annular groove (61).

2. A low-pressure, low-load, low-cost, zero-leakage flue gas valve according to claim 1, characterized in that: The connecting portion (7) comprises a screw plate (71) and an internally threaded cylindrical pin (72); the screw plate (71) is sleeved on the valve stem (5), and one side of the screw plate (71) is welded and fixed on the valve plate (6); the valve stem (5) and the screw plate (71) are both provided with a threaded hole (73), and the internally threaded cylindrical pin (72) is connected to the internal thread of the threaded hole (73).

3. A low-pressure, low-load, low-cost, zero-leakage flue gas valve according to claim 1, characterized in that: The inner wall of the valve body (1) is also provided with a sealing ring (9), and the sealing ring (9) is arranged concentrically with the valve plate (6), the inner wall of the sealing ring (9) is provided with a first conical surface (91), and the circumferential surface of the valve plate (6) is provided with a second conical surface (62), and the first conical surface (91) and the second conical surface (62) cooperate with each other.

4. A low-pressure, low-load, low-cost, zero-leakage flue gas valve according to claim 1, characterized in that: The sealing ring (8) is a hollow ring.

5. The low-pressure, low-load, low-cost, zero-leakage flue gas valve according to claim 1, characterized in that: A set screw (63) is also provided on one side of the valve plate (6), and the conical tip of the set screw (63) abuts against the sealing ring (8).

6. A low-pressure, low-load, low-cost, zero-leakage flue gas valve according to claim 1, characterized in that: A first sealing member (10) is provided on the first sleeve (2), and the first sealing member (10) comprises a packing pressure plate (101), a packing pressure sleeve (102), a graphite packing ring (103) and a sealing gasket (104) which are sequentially sleeved on the valve stem (5) from top to bottom, and the packing pressure sleeve (102), the graphite packing ring (103) and the sealing gasket (104) are located on the inner side of the first sleeve (2), and the packing pressure plate (101) is connected to the first sleeve (2) via a first fastening bolt (105).

7. A low-pressure, low-load, low-cost, zero-leakage flue gas valve according to claim 1, characterized in that: A second sealing member (11) is provided on the second sleeve (3), and the second sealing member (111) comprises a split ring (111), an O-ring (112), a bottom cover (113) and a second fastening bolt (114); the bottom cover (113) is connected to the second sleeve (3) via the second fastening bolt (114); an O-ring (112) is provided between the bottom cover (113) and the second sleeve (3); a split ring (111) is further provided between the bottom cover (113) and the shaft sleeve (4) located in the second sleeve (3); and the split ring (111) is sleeved on the valve stem (5).

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