Two-way protected high volume blast valve

Abstract

This invention discloses a bidirectional protection high-volume explosion-proof valve. It includes a valve frame assembly and a valve blade assembly, with one set of valve blade assemblies and a pair of limiting baffles (3). Each shaft (4) divides the valve blade (5) connected to it into a lower half and an upper half along the axial direction. The width c of the lower half of the top valve blade (5) is greater than the width d of the upper half, and the width h of the lower half of the bottom valve blade (5) is less than the width g of the upper half. When the valve blade (5) is in the open state, the lower part of the upper valve blade (5) and the upper part of the lower valve blade (5) overlap on the vertical plane passing through the shaft (4) between adjacent valve blades (5). This invention is mainly used in explosion-proof buildings in industries such as petrochemicals.

Description

Technical Field

[0001] This invention belongs to the field of ventilation and air conditioning technology, and relates to a bidirectional protection high-volume explosion-proof valve. Background Technology

[0002] In recent years, with the rapid development of my country's petrochemical industry, the explosion-proof control room, as the "nerve center" of petrochemical enterprises, has become increasingly important. Because its building employs an explosion-proof structure, and to withstand sudden external explosions, explosion-proof valves are installed at the ventilation and air conditioning inlets and outlets in the explosion-proof exterior walls to prevent blast waves from entering the room through these openings, thus protecting the safety of personnel and equipment inside. Under normal circumstances, the explosion-proof valves are open, allowing for normal air intake and exhaust for the ventilation and air conditioning system. When an explosion occurs outside and a destructive blast wave arrives, the explosion-proof valves automatically adjust their opening or close based on overpressure, preventing damage to the building's interior from the blast wave. However, after the positive pressure impact has passed, the surrounding air rapidly converges at the explosion center due to air loss, immediately creating a negative pressure impact. Therefore, it is necessary to immediately block the impact caused by the negative pressure shock wave.

[0003] Chinese patent CN111927998A discloses a bidirectional explosion-proof valve for high air volume, which isolates positive and negative pressure shock waves by connecting two sets of unidirectional rotating valve blades in series. Its structure is relatively complex, requiring significant maintenance. Furthermore, due to the large spacing between the valve blades, the valve blades are not rainproof when normally open, necessitating the installation of additional rainproof louvers or other rainproof devices. Summary of the Invention

[0004] The purpose of this invention is to provide a bidirectional protection large-volume explosion-proof valve to solve the problems of complex structure and inability of valve blades to prevent rain when normally open, which exist in existing bidirectional protection large-volume explosion-proof valves.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a bidirectional protection large-volume explosion-proof valve, including a valve frame assembly and a valve blade assembly. The valve frame assembly includes a rectangular frame formed by an upper end plate, a lower end plate, a left end plate, and a right end plate, and limiting baffles disposed on the inner surfaces of the upper and lower end plates. The valve blade assembly includes a shaft, a valve blade connected to the shaft, a first rotating positioning plate disposed on the outer side of the left end plate, and a first connecting rod. The valve blade assembly also includes a second rotating positioning plate disposed on the outer side of the right end plate, a spring, and a positioning block. Each shaft divides the valve blade connected to it into a lower half and an upper half along the axial direction. The width of the lower half of the top valve blade is greater than the width of the upper half. The valve blade assembly is characterized by: one set of valve blade assemblies and one pair of limiting baffles. The width of the lower half of the bottom valve blade is less than the width of the upper half. When the valve blade is in the open state, the lower part of the lower half of the upper valve blade and the upper part of the upper half of the lower valve blade overlap on the vertical plane passing through the shaft between adjacent valve blades.

[0006] The present invention has the following advantages: 1. The explosion-proof valve has only one set of valve leaf assembly, which is simple in structure and can reduce manufacturing costs, post-maintenance workload and post-maintenance costs; 2. The valve leaf can be rainproof when it is in the normal open state (see the description in the detailed implementation section), and there is no need to install additional rainproof louvers or other rainproof devices.

[0007] The explosion-proof valve of this invention has a bidirectional protection function and can quickly isolate positive and negative pressure shock waves; it has a large flow area and low pressure drop under large air volume flow conditions; it is mainly used in explosion-proof buildings in industries such as petrochemicals.

[0008] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The accompanying drawings and specific embodiments do not limit the scope of protection claimed by the present invention. Attached Figure Description

[0009] Figure 1 This is a three-dimensional schematic diagram of a bidirectional protection high-volume explosion-proof valve of the present invention in a ventilation state;

[0010] Figure 2 This is a front view of a bidirectional protection high-volume explosion-proof valve of the present invention in the ventilation state;

[0011] Figure 3 This is a top view of a bidirectional protection high-volume explosion-proof valve of the present invention in the ventilation state;

[0012] Figure 4 This is a left view of a bidirectional protection high-volume explosion-proof valve of the present invention in the ventilation state;

[0013] Figure 5 This is a left view of a bidirectional protection high-volume explosion-proof valve of the present invention in the ventilation state with the protective plate removed;

[0014] Figure 6 This is a right view of a bidirectional protection high-volume explosion-proof valve of the present invention in the ventilation state with the protective plate removed;

[0015] Figure 7 This is a cross-sectional view of a bidirectional protection, high-volume explosion-proof valve of the present invention in a ventilation state (in...). Figure 2 (Sectional view at position AA in the middle);

[0016] Figure 8 This is a three-dimensional schematic diagram of a bidirectional protection high-volume explosion-proof valve of the present invention in the explosion-proof state;

[0017] Figure 9 This is a left view of a bidirectional protection high-volume explosion-proof valve of the present invention in explosion-proof state with the protective plate removed;

[0018] Figure 10 This is a right view of a bidirectional protection high-volume explosion-proof valve of the present invention in explosion-proof state with the protective plate removed;

[0019] Figure 11 This is a schematic diagram of a bidirectional protection high-volume explosion-proof valve of the present invention blocking positive pressure shock waves in explosion-proof state (in...). Figure 2 (Sectional view at position AA in the middle);

[0020] Figure 12 This is a schematic diagram of a bidirectional protection high-volume explosion-proof valve of the present invention blocking negative pressure shock waves in explosion-proof state (in...). Figure 2 (Sectional view at position AA in the middle);

[0021] Figure 13 This is a right view of the large-volume explosion-proof valve with bidirectional protection in the ventilation state, with the protective plate removed, according to another version of the present invention.

[0022] Figure 14 This is a cross-sectional view of another bidirectional protection high-volume explosion-proof valve of the present invention in the ventilation state (in... Figure 2 (Sectional view at position AA in the middle).

[0023] Figures 1 to 14 In this drawing, the same reference numerals indicate the same technical features. Reference numerals indicate: 101—upper end plate; 102—lower end plate; 201—left end plate; 202—right end plate; 3—limiting baffle; 4—shaft; 5—valve leaf; 6—first rotating positioning plate; 7—first connecting rod; 8—second rotating positioning plate; 9—positioning bolt; 10—tensioning bolt; 11—spring; 12—positioning block; 12a—tightening bolt nut; 13—protective plate; 14—connecting rod bolt; 15—positioning pin; 16—outdoor side; 17—indoor side; 18—second connecting rod; 19—slide groove; 20—bolt hole. Detailed Implementation

[0024] Figure 1 , 2 Figures 3, 4, 5, 6, 7, 13, and 14 are structural diagrams of the bidirectional protection high-volume explosion-proof valve (hereinafter referred to as the explosion-proof valve) of the present invention in the ventilation state (valve leaf 5 is normally open). The explosion-proof valve includes a valve frame assembly and a set of valve leaf assemblies. The valve frame assembly includes a rectangular frame formed by an upper end plate 101, a lower end plate 102, a left end plate 201, and a right end plate 202 with bolt holes 20, and a pair of limiting baffles 3 disposed on the inner surfaces of the upper end plate 101 and the lower end plate 102. The valve frame assembly can be a welded, bolted, or riveted structure. The limiting baffles 3 are used to limit excessive rotation of the valve leaf 5 when it is closed, preventing the valve leaf 5 from opening in the reverse direction when the shock wave is too large. The limiting baffles 3 can be circular plates, rectangular plates, etc.

[0025] The valve vane assembly includes shafts 4 evenly distributed within a rectangular frame, each penetrating the left end plate 201 and right end plate 202 respectively; valve vanes 5 positioned between the left and right end plates 201 and connected to shafts 4; a first rotating positioning plate 6 vertically arranged on one side of the rectangular frame outside the left end plate 201 and penetrated by shafts 4; and a first connecting rod 7 connected to the first rotating positioning plate 6 via connecting rod bolts 14. Shafts 4, the first rotating positioning plate 6, and the first connecting rod 7 connected to the first rotating positioning plate 6 form a whole, ensuring that all shafts 4 rotate synchronously. The valve vane assembly also includes a second rotating positioning plate 8 vertically arranged on the other side of the rectangular frame outside the right end plate 202 and penetrated by shafts 4; a positioning bolt 9 positioned on the second rotating positioning plate 8; a spring 11; a tension bolt 10 positioned above the second rotating positioning plate 8; and a positioning block 12 positioned above the second rotating positioning plate 8 and contacting the upper side of the second rotating positioning plate 8 when the valve vane 5 is open. The positioning bolt 9 is connected to the tension bolt 10 via a spring 11, which holds the second rotating positioning piece 8 in place. The second rotating positioning piece 8 can rotate with the shaft 4. The valve leaf 5 is rectangular, and the cross-sectional shape of the shaft 4 can be square, circular, or other polygonal. The shaft 4 is horizontally positioned and can be connected to the valve leaf 5 by welding, bolting, or riveting. The main purpose of the positioning block 12 is to limit the opening angle of the valve leaf 5 (the opening angle of the valve leaf 5 refers to its maximum opening angle). The positioning block 12 can be cylindrical, cuboid, etc.

[0026] Positioning pins 15 are provided at both ends of shaft 4. The first rotating positioning piece 6 contacts the outer surface of the left end plate 201 on one side of the rectangular frame via the positioning pins 15, and the positioning pins 15 restrict the first rotating positioning piece 6 from moving horizontally along the axial direction of shaft 4. The second rotating positioning piece 8 contacts the outer surface of the right end plate 202 on the other side of the rectangular frame via the positioning pins 15, and the positioning pins 15 restrict the second rotating positioning piece 8 from moving horizontally along the axial direction of shaft 4.

[0027] Each shaft 4 divides the valve leaf 5 connected to it into a lower half and an upper half along the axial direction. See also Figure 7The width c (distance from the middle of the connection between the top valve leaf 5 and the shaft 4 to the bottom of the top valve leaf 5) of the lower half is greater than the width d (distance from the middle of the connection between the top valve leaf 5 and the shaft 4 to the top of the top valve leaf 5), and the width h (distance from the middle of the connection between the bottom valve leaf 5 and the shaft 4 to the bottom of the bottom valve leaf 5) of the lower half is less than the width g (distance from the middle of the connection between the bottom valve leaf 5 and the shaft 4 to the top of the bottom valve leaf 5). When the valve leaf 5 is in the open state, the lower part of the lower half of the upper valve leaf 5 and the upper part of the upper half of the lower valve leaf 5 overlap on the vertical plane passing through the shaft 4, with an overlap width generally ranging from 50 to 170 mm. Due to this overlap, when the explosion-proof valve is in the ventilation state, outdoor air carrying rainwater flows through the upward-sloping flow channel between the valve leaves 5 and impacts the valve leaves 5. This impact acts as an air-water separation mechanism, preventing outdoor rainwater from entering the room. The aforementioned overlap also enables the explosion-proof valve of the present invention to have a bidirectional protection function, capable of isolating positive and negative pressure shock waves.

[0028] The valve 5 located between the top valve 5 and the bottom valve 5 is the middle valve 5. The width f of the lower half of the middle valve 5 (the distance from the middle of the connection between the middle valve 5 and the shaft 4 to the bottom of the middle valve 5) is equal to the width e of the upper half (the distance from the middle of the connection between the middle valve 5 and the shaft 4 to the top of the middle valve 5). The total width (f+e) of a middle valve 5 is generally 200 to 400 mm.

[0029] The width c of the lower half of the top valve leaf 5 is equal to f, and the width d of the upper half of the top valve leaf 5 is generally 50-100 mm (preferably 50-75 mm). The width g of the upper half of the bottom valve leaf 5 is equal to e, and the width h of the lower half of the bottom valve leaf 5 is generally 50-100 mm (preferably 50-75 mm). When this invention refers only to valve leaves, it refers to all valve leaves.

[0030] Widths c, e, f, and g should ensure that the top and bottom of a valve leaf 5 connected to a shaft 4 do not touch the shaft 4 adjacent to that shaft 4.

[0031] When valve vane 5 is in the open state, its opening angle B is generally 30° to 60°. The opening angle B is the angle between valve vane 5 and the vertical plane passing through shaft 4.

[0032] When valve leaf 5 is in the closed state (the explosion-proof valve is in the explosion-proof state), a seal is formed between adjacent valve leaves 5. Specifically, a seal is formed between the lower half of the upper valve leaf 5 and the upper half of the lower valve leaf 5. Additionally, a seal is formed between the upper half of the top valve leaf 5 and the limiting baffle 3 on the inner surface of the upper end plate 101, and a seal is formed between the lower half of the bottom valve leaf 5 and the limiting baffle 3 on the inner surface of the lower end plate 102. See also... Figure 9 , Figure 10 , Figure 11 and Figure 12 .

[0033] In this invention, the valve frame assembly may be provided with protective plates 13 on the left end plate 201 and the right end plate 202 to protect the moving components such as the spring 11, the first connecting rod 7, the first rotating positioning plate 6, and the second rotating positioning plate 8 in the valve leaf assembly from the influence of the external environment.

[0034] This invention Figures 1 to 12 The explosion-proof valve shown has a fixed positioning block 12 (fixed to the outer surface of the right end plate 202), whose position remains unchanged (same as the positioning block described in CN111927998A). This prevents on-site adjustment of the valve leaf 5's opening angle to meet the requirements of different airflow rates. To solve this problem, the positioning block 12 of this invention can be non-fixed, such as... Figure 13 and Figure 14 As shown. The non-fixed positioning block 12 is clamped at the slide groove 19 using a tightening bolt and nut 12a. The slide groove 19 is located on the right end plate 202. Multiple non-fixed positioning blocks 12 are preferably connected by a second connecting rod 18 to ensure that all positioning blocks 12 slide synchronously along their respective slide grooves 19 after the tightening bolt and nut 12a is loosened. Each positioning block 12 is fixedly connected to the second connecting rod 18. The second rotating positioning piece 8 is always located outside the second connecting rod 18 and may or may not be in contact with it. Using the non-fixed positioning block 12 allows for on-site adjustment of the valve leaf 5 within a certain range to meet the requirements of different airflow rates, while ensuring that the valve leaf 5 does not vibrate or generate noise under normal ventilation conditions.

[0035] The application of the explosion-proof valve of this invention is as follows:

[0036] See Figure 5 , 6 7. During normal ventilation, valve leaf 5 is in the initial open position through shaft 4 and the second rotating positioning plate 8, and under the mutual action of spring 11 and positioning block 12, airflow enters the indoor side 17 from the outdoor side 16 through the flow channel between valve leaf 5 with a certain opening angle B.

[0037] See Figure 8 , 910, 11. When the opened valve leaf 5 is impacted by the positive pressure shock wave from the outdoor side 16, the projections of the lower half of the upper valve leaf 5 and the upper half of the lower valve leaf 5 on the vertical plane passing through the axis 4 overlap, causing the upper half of the lower valve leaf 5 to be blocked by the lower half of the upper valve leaf 5. Moreover, the width c of the lower half of the top valve leaf 5 is greater than the width d of the upper half, resulting in the impact force on the lower half of the top valve leaf 5 and each middle valve leaf 5 being greater than the impact force on the upper half. The difference in impact force between the upper and lower halves of all valve leaves 5 generates a torque on each shaft 4 that overcomes the tension of the spring 11. This torque is generated on each shaft 4 by the second rotating positioning plate 8, causing the top valve leaf 5 and the middle valve leaf 5 to rotate together with their respective shafts 4 and the first rotating positioning plate 6 on those shafts 4. This causes the first connecting rod 7 to move. The first connecting rod 7 then drives the first rotating positioning plate 6 on the shaft 4 where the bottom valve leaf 5 is located and the shaft 4 to rotate, causing the bottom valve leaf 5 to rotate until all valve leaves 5 are in the closed state, blocking the positive pressure shock wave from entering the indoor side 17.

[0038] See Figure 8 , 9 10, 12. When the opened valve leaf 5 is impacted by the negative pressure shock wave from the indoor side 17, the projections of the lower half of the upper valve leaf 5 and the upper half of the lower valve leaf 5 on the vertical plane passing through the axis 4 overlap, causing the lower half of the upper valve leaf 5 to be blocked by the upper half of the lower valve leaf 5. Moreover, the width h of the lower half of the bottom valve leaf 5 is smaller than the width g of the upper half, resulting in the bottom valve leaf 5 and the upper half of each middle valve leaf 5 experiencing a greater impact force than the lower half. The difference in impact force between the upper and lower halves of all valve leaves 5 generates a torque on each shaft 4 that overcomes the tension of the spring 11. This torque is generated on each shaft 4 by the second rotating positioning plate 8, causing the bottom valve leaf 5 and the middle valve leaf 5 to rotate together with their respective shafts 4 and the first rotating positioning plate 6 on those shafts 4. This causes the first connecting rod 7 to move. The first connecting rod 7 then drives the first rotating positioning plate 6 on the shaft 4 where the top valve leaf 5 is located and the shaft 4 to rotate, causing the top valve leaf 5 to rotate until all valve leaves 5 are in the closed state, blocking the negative pressure shock wave from entering the outdoor side 16.

[0039] See Figure 5 , 6 7. When the positive or negative pressure shock wave disappears, spring 11 pulls the second rotating positioning plate 8 to rotate until its upper side contacts the positioning block 12. The second rotating positioning plate 8 then drives shaft 4 and valve leaf 5 to rotate. Valve leaf 5 rotates to its initial open position, and the explosion-proof valve performs normal ventilation.

[0040] In summary, when the explosion-proof valve of the present invention is subjected to positive and negative pressure shock waves, the valve leaf 5 automatically closes and resets under the combined action of the difference in impact force between the upper and lower parts of the valve leaf 5 and the spring force. When the valve leaf 5 is open, the bottom is closer to the outdoor side 16 and the top is closer to the indoor side 17.

[0041] The "large air volume" mentioned in this invention refers to a ventilation volume of not less than 16,000 cubic meters per hour when the pressure drop is 100 Pa at 1 standard atmosphere (absolute pressure), 20°C, and per unit valve body flow cross-sectional area (per square meter).

[0042] In the description of this invention, the terms "inner", "outer", "upper", "lower", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and do not require that this invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0043] The explosion-proof valve of this invention is installed at the outdoor air inlet and outlet of the ventilation and air conditioning system of an explosion-proof building. It can be installed on the outside of the explosion-proof wall, the inside of the explosion-proof wall, or embedded in the middle of the explosion-proof wall. The engineering design can be flexibly adjusted according to different needs. Ventilation grilles, ventilation elbows, and other accessories can be additionally installed on the valve frame assembly to prevent explosion fragments from damaging the valve leaf and other actuators.

Claims

1. A bidirectional protection high-volume explosion-proof valve, comprising a valve frame assembly and a valve blade assembly, wherein the valve frame assembly comprises a rectangular frame formed by an upper end plate (101), a lower end plate (102), a left end plate (201), and a right end plate (202), and limiting baffles (3) disposed on the inner surfaces of the upper end plate (101) and the lower end plate (102); the valve blade assembly comprises a shaft (4), a valve blade (5) connected to the shaft (4), and a first rotating positioning plate (6) and a first connecting rod (7) disposed on the outer side of the left end plate (201); the valve blade assembly further comprises a second rotating positioning plate (8), a spring (11), and a positioning block (12) disposed on the outer side of the right end plate (202); each shaft (4) divides the valve blade (5) connected to it into a lower half and an upper half along the axial direction, wherein the width c of the lower half of the top valve blade (5) is greater than the width d of the upper half; characterized in that: A set of valve leaf assemblies is provided, and a pair of limit baffles (3) are provided. The width h of the lower half of the bottom valve leaf (5) is less than the width g of the upper half. When the valve leaf (5) is in the open state, the lower part of the lower half of the upper valve leaf (5) and the upper part of the upper half of the lower valve leaf (5) overlap on the vertical plane passing through the shaft (4). The width f of the lower half of the middle valve leaf (5) is equal to the width e of the upper half. The total width (f+e) of the middle valve leaf (5) is 200-400mm. The width c of the lower half of the top valve leaf (5) is equal to f. The width d of the upper half of the top valve leaf (5) is 50-100mm. The width g of the upper half of the bottom valve leaf (5) is equal to e, and the width h of the lower half of the bottom valve leaf (5) is 50-100 mm. When the valve leaf (5) is in the open state, when it is impacted by a positive pressure shock wave from the outdoor side (16), the impact force on the lower half of the top valve leaf (5) and each middle valve leaf (5) is greater than the impact force on the upper half, causing the valve leaf (5) to close. When the valve leaf (5) is in the open state, when it is impacted by a negative pressure shock wave from the indoor side (17), the impact force on the upper half of the bottom valve leaf (5) and each middle valve leaf (5) is greater than the impact force on the lower half, causing the valve leaf (5) to close.

2. The explosion-proof valve according to claim 1, characterized in that: When the valve leaf (5) is in the open state, its opening angle B is 30° to 60°.

3. The explosion-proof valve according to claim 1, characterized in that: When the valve leaf (5) is in the closed state, a seal is formed between adjacent valve leaves (5). The upper half of the top valve leaf (5) is in contact with the limiting baffle (3) on the inner surface of the upper end plate (101) to form a seal, and the lower half of the bottom valve leaf (5) is in contact with the limiting baffle (3) on the inner surface of the lower end plate (102) to form a seal.

4. The explosion-proof valve according to any one of claims 1 to 3, characterized in that: The positioning block (12) can be fixed or non-fixed.

5. The explosion-proof valve according to claim 4, characterized in that: The positioning block (12) is not fixed and is clamped in the slide groove (19) by tightening bolts and nuts (12a). The slide groove (19) is located on the right end plate (202).

6. The explosion-proof valve according to claim 5, characterized in that: Multiple non-fixed positioning blocks (12) are connected by a second link (18).

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