CN116838831A - Two-way protection large air volume antiknock valve - Google Patents

Abstract

The invention discloses a bidirectional-protection large-air-volume antiknock valve. The valve comprises a valve frame assembly and valve blade assemblies, wherein the valve blade assemblies are arranged in a group, and a pair of limit baffles (3) are arranged. The valve frame assembly comprises an upper end plate (101), a lower end plate (102), a left end plate, a right end plate, a limiting baffle, a valve blade baffle (12), a first positioning baffle (14) and a second positioning baffle (18), and the valve blade assembly comprises a rotating shaft (4), a valve blade (5), a rotating positioning piece, a connecting rod bolt, a spring, a tension bolt and a sealing gasket (9). The width c of the lower half of the top valve vane is greater than the width d of the upper half, and the width h of the lower half of the bottom valve vane is less than the width g of the upper half. When the valve blades (5) are in an open state, projections of the lower part of the upper valve blade half and the upper part of the upper valve blade half of the lower valve blade half on a vertical plane passing through the rotating shaft are overlapped between the adjacent valve blades. The invention is mainly used for antiknock buildings in petrochemical industry and the like.

Description

Two-way protection large air volume antiknock valve

Technical Field

The invention belongs to the technical field of ventilation air conditioners, and relates to a large-air-volume antiknock valve with bidirectional protection.

Background

In recent years, with the rapid development of petrochemical industry in China, as an antiknock control room of a nerve center of petrochemical enterprises, an antiknock structure is adopted in a building, and in order to resist sudden explosion outside, antiknock valves are required to be installed at an air inlet and an air outlet of a ventilation air conditioner arranged on an antiknock outer wall so as to prevent explosion shock waves from being transmitted into the room through a hole on the outer wall, thereby protecting the safety of indoor workers and equipment. Under normal conditions, the antiknock valve is in an open state and is used for normal air intake and exhaust of the ventilation air-conditioning system. When outdoor explosion occurs and destructive explosion shock waves arrive, the opening degree or closing of the anti-explosion valve can be automatically adjusted according to the overpressure, and damage of the explosion shock waves to the inside of the building is blocked. However, when the positive pressure impact passes, the explosion center is rapidly concentrated to the center due to the air loss, and a negative pressure impact is immediately formed to the periphery. Therefore, it is necessary to immediately block the impact caused by the negative pressure shock wave.

Chinese patent CN111927998A discloses an antiknock valve for protecting large air volume in two directions, which separates positive pressure shock wave and negative pressure shock wave by connecting two sets of valve blades in series. The structure is relatively complex, and the later maintenance workload is large. Moreover, because the space between valve blades of the large-air-quantity antiknock valve is larger, the valve blades cannot be rainproof when normally opened, and a rainproof shutter or other rainproof devices are additionally arranged. In addition, when the valve blade is closed due to the impact of the explosion shock wave, the valve blade is limited to excessively rotate only by the contact between the two sets of baffles arranged at the front-back symmetrical positions of the upper end plate and the lower end plate and the upper adjacent valve blade, so the total contact area between the valve blade and the baffles and between the valve blade is small; all the valve blades and the baffle plates are made of high-strength materials, so that the valve blades and the baffle plates cannot be damaged due to the fact that the stress applied to the valve blades and the baffle plates exceeds the allowable stress of the materials at the moment of contact.

Disclosure of Invention

The invention aims to provide a large-air-volume antiknock valve with bidirectional protection, which solves the problems that the existing large-air-volume antiknock valve with bidirectional protection has a complex structure, a valve blade cannot be rain-proof when being normally opened, and the valve blade and a baffle are manufactured by adopting high-strength materials so as to prevent damage.

In order to solve the problems, the invention adopts the following technical scheme: the utility model provides a big amount of wind antiknock valve of two-way protection, including valve frame subassembly and valve leaf subassembly, valve frame subassembly includes the rectangle frame that is enclosed by upper end plate, lower end plate, left end plate and right end plate, still including setting up limit baffle on upper end plate and lower end plate internal surface, valve leaf subassembly includes the pivot, the valve leaf that links to each other with the pivot and set up rotary positioning piece, connecting rod and connecting rod bolt in the left end plate outside, every pivot divide into lower half and upper half with its valve leaf that links to each other along the axial, the width of top valve leaf lower half is greater than the width of upper half, its characterized in that: the valve blade assembly sets up a set of, and limit baffle sets up a pair of, and the width of bottom valve blade lower half is less than the width of first half, and valve frame assembly still includes the valve blade baffle that sets up between left end board and right end board, first location baffle and second location baffle, sets up respectively between each adjacent two pivots one valve blade baffle, except that the top pivot, the top of every pivot of the rest respectively set up one first location baffle, first location baffle is close to indoor side than the valve blade baffle, is equipped with one in the below of top pivot second location baffle, second location baffle is close to outdoor side than the valve blade baffle, the valve blade assembly still including setting up the spring in the left end board outside and set up the tension bolt on the left end board, the top of every rotary positioning piece respectively set up one tension bolt, link bolt on every rotary positioning piece links to each other through the spring between the tension bolt of this rotary positioning piece top.

The upper half of the top valve blade and the side of the upper part of each other valve blade facing the outdoor side are provided with sealing gaskets, and the lower half of the bottom valve blade and the side of the lower part of each other valve blade facing the indoor side are provided with sealing gaskets.

When the valve blades are in an open state, projections of the lower part of the upper valve blade half and the upper part of the upper valve blade half of the lower valve blade half on a vertical plane passing through the rotating shaft are overlapped between the adjacent valve blades.

The invention has the following beneficial effects: 1. the antiknock valve is only provided with a group of valve leaf components, has simple structure, and can reduce the manufacturing cost, the later maintenance workload and the later maintenance cost; 2. the valve blade can be rainproof (see the description of the detailed description of the embodiment part) in a normal opening state, and a rainproof shutter or other rainproof devices are not required to be additionally arranged; 3. when the valve blade is closed by the impact of explosion shock waves (positive pressure shock waves and negative pressure shock waves), the valve blade, the limit baffle and the valve blade baffle are in contact with more parts and larger in total contact area, so that the stress on the parts is smaller (see the description of the detailed description of the embodiment part). The components are not required to be made of high-strength materials, and the materials such as low-carbon steel, stainless steel or aluminum alloy can ensure that the stress applied during contact does not exceed the allowable stress of the materials and cannot be damaged.

The antiknock valve has a bidirectional protection function, and can rapidly separate positive pressure shock waves and negative pressure shock waves; the flow area is large, and the pressure drop under the condition of large air volume flow is small; the method is mainly used for antiknock buildings in petrochemical industry and the like.

The invention will be described in further detail with reference to the drawings and the detailed description. The drawings and detailed description are not intended to limit the scope of the invention as claimed.

Drawings

FIG. 1 is a schematic perspective view of a bi-directional protected large air volume antiknock valve in a ventilation state;

FIG. 2 is a front view of a bi-directionally protected high volume blast resistant valve of the present invention in a vent condition;

FIG. 3 is a top view of a bi-directionally protected large volume blast resistant valve of the present invention in a vent state;

FIG. 4 is a left side view of a bi-directionally protected large volume blast resistant valve of the present invention in a vent condition;

FIG. 5 is a left side view of a shield of the bi-directionally protected high volume blast resistant valve of the present invention in a vent state;

FIG. 6 is a right side view of a shield of the bi-directionally protected high volume blast resistant valve of the present invention in a vent state;

FIG. 7 is a cross-sectional view of a bi-directionally protected high volume blast resistant valve of the present invention in a vented condition (cross-section at position A-A in FIG. 2);

FIG. 8 is a schematic perspective view of a bi-directionally protected large volume blast antiknock valve of the present invention in an antiknock state;

FIG. 9 is a left side view of a de-shield of the bi-directionally protected large volume blast resistant valve of the present invention in an antiknock condition;

FIG. 10 is a right side view of a de-shield of the bi-directionally protected high volume blast resistant valve of the present invention in an antiknock condition;

FIG. 11 is a schematic illustration of a bi-directionally protected large volume blast resistant valve of the present invention in an antiknock state blocking positive pressure shock waves (shown in section at A-A in FIG. 2);

fig. 12 is a schematic view (section A-A in fig. 2) of a bi-directionally protected large volume blast antiknock valve of the present invention in an antiknock state against negative pressure shock waves.

In fig. 1 to 12, the same reference numerals denote the same technical features. Reference numerals denote: 101-an upper end plate; 102-a lower end plate; 201—left end plate; 202-right end plate; 3-a limit baffle; 4-a rotating shaft; 5-valve blade; 6, rotating the positioning sheet; 7, connecting rods; 8, connecting rod bolts; 9, a sealing gasket; 10-tightening bolts; 11-a spring; 12-valve leaf baffle; 13-guard board; 14-a first positioning baffle; 15-outdoor side; 16-indoor side; 17-bolt holes; 18-a second positioning baffle.

Detailed Description

Fig. 1, 2, 3, 4, 5, 6 and 7 are schematic structural diagrams of the bi-directional protection large-air-volume antiknock valve (simply referred to as antiknock valve) in a ventilation state (valve blade 5 is normally opened). The antiknock valve includes a valve frame assembly and a set of valve vane assemblies. The valve frame assembly includes a rectangular frame surrounded by an upper end plate 101 provided with bolt holes 17, a lower end plate 102, a left end plate 201, and a right end plate 202, and further includes a pair of limit stops 3 provided on the inner surfaces of the upper end plate 101 and the lower end plate 102, a valve blade stop 12 provided between the left end plate 201 and the right end plate 202, and a first positioning stop 14 and a second positioning stop 18. One valve leaf baffle 12 is respectively arranged between every two adjacent rotating shafts 4. Except for the top shaft 4 (i.e., the uppermost shaft 4, i.e., the shaft 4 where the top valve blade 5 is located), one of the first positioning baffles 14 is disposed above each of the remaining shafts 4, and the first positioning baffles 14 are located closer to the indoor side 16 than the valve blade baffles 12. Below the top shaft 4 is provided a second positioning baffle 18, which second positioning baffle 18 is closer to the outdoor side 15 than the valve flap 12. The valve leaf flaps 12 are arranged parallel to each other and horizontally in the longitudinal direction, and both ends of the valve leaf flaps 12 are fixed to the left end plate 201 and the right end plate 202, respectively. The first positioning baffle 14 and the second positioning baffle 18 are parallel to each other and horizontally arranged in the longitudinal direction, and both ends of the first positioning baffle 14 and the second positioning baffle 18 are fixed to the left end plate 201 and the right end plate 202, respectively. Each spindle 4 is parallel to each valve vane flap 12, first positioning flap 14 and second positioning flap 18. The valve frame assembly may be a welded, bolted or riveted structure. The limit baffle 3 and the valve blade baffle 12 are used for limiting excessive rotation when the valve blade 5 is closed, and preventing the valve blade 5 from opening reversely when the shock wave is excessive. The first positioning baffle 14 and the second positioning baffle 18 serve to limit the opening angle at which the valve blade 5 is opened (the opening angle of the valve blade 5 refers to the maximum opening angle of the valve blade 5). The limit stop 3, the valve vane stop 12, the first positioning stop 14 and the second positioning stop 18 may be in planar contact with the valve vane 5, and may be generally rectangular plates, or may be planar plates of other shapes.

The valve blade assembly comprises rotating shafts 4 which are equidistantly distributed in a rectangular frame and two ends of the rotating shafts penetrate through a left end plate 201 and a right end plate 202 respectively, valve blades 5 which are arranged between the left end plate 201 and the right end plate 202 and connected with the rotating shafts 4, sealing gaskets 9 which are arranged on the valve blades 5, rotating positioning pieces 6 which are vertically arranged outside the left end plate 201 on one side of the rectangular frame and penetrated by the rotating shafts 4, and connecting rods 7 which are connected with the rotating positioning pieces 6 through connecting rod bolts 8. The rotary positioning sheet 6 is fixed on the rotating shaft 4 and can rotate along with the rotating shaft 4. The rotation positioning piece 6 is in contact with the outer surface of the left end plate 201 on one side of the rectangular frame. The rotating shaft 4, the rotary positioning sheet 6 and the connecting rod 7 connected with the rotary positioning sheet 6 form a whole, so that all the rotating shafts 4 are ensured to synchronously rotate. The valve vane assembly further comprises a spring 11, a tension bolt 10 arranged above each rotary spacer 6. The connecting rod bolts 8 on each rotary locating plate 6 are connected with the tension bolts 10 above the rotary locating plate 6 through springs 11, and the springs 11 pull the rotary locating plates 6. The valve blade 5 is a generally rectangular plate, and the cross-sectional shape of the shaft 4 may be square, circular or other polygonal shape. The rotating shaft 4 is horizontally arranged and can be connected with the valve blade 5 by welding, bolting or riveting.

Each shaft 4 divides the valve vane 5 connected thereto into a lower half and an upper half in the axial direction. Referring to fig. 7, the width c of the lower half of the top valve blade 5 (i.e., the uppermost valve blade 5) (the distance from the middle of the junction of the top valve blade 5 with the rotating shaft 4 to the bottom of the top valve blade 5) is greater than the width d of the upper half (the distance from the middle of the junction of the top valve blade 5 with the rotating shaft 4 to the top of the top valve blade 5), and the width h of the lower half of the bottom valve blade 5 (i.e., the lowermost valve blade 5) (the distance from the middle of the junction of the bottom valve blade 5 with the rotating shaft 4 to the bottom of the bottom valve blade 5) is smaller than the width g of the upper half (the distance from the middle of the junction of the bottom valve blade 5 with the rotating shaft 4 to the top of the bottom valve blade 5). The upper half of the top valve leaf 5 and the sides of the upper half of the remaining valve leaves 5 facing the outdoor side 15 are provided with gaskets 9, the lower half of the bottom valve leaf 5 and the sides of the lower half of the remaining valve leaves 5 facing the indoor side 16 are provided with gaskets 9, and the gaskets 9 are arranged on the backing plates at the corresponding positions on the sides of the valve leaves 5. In the drawings of the present invention, the cross section of the gasket 9 is shown with a black filling pattern. The material of the gasket 9 is typically ethylene propylene diene monomer, silica gel or polyvinyl chloride.

When the valve flaps 5 are in the open state, the projections of the lower part of the lower half of the upper valve flap 5 and the upper part of the upper half of the lower valve flap 5 on the vertical plane passing through the rotation shaft 4 overlap each other between the adjacent valve flaps 5 (the overlapping width is generally 50 to 170 mm). Due to the overlapping, when the antiknock valve is in a ventilation state, air with outdoor rainwater is enabled to flow through the upward inclined circulation channels between the valve blades 5 and impact the valve blades 5, so that the impact plays a role in gas-water separation, and the outdoor rainwater can be prevented from entering a room. The overlapping also enables the antiknock valve of the invention to have a bidirectional protection function and to be capable of blocking positive pressure and negative pressure shock waves. In order to more tightly block the outdoor rainwater from entering the room, it is also possible to overlap the gasket 9 provided on the side of the upper half of the top valve blade 5 facing the outdoor side 15 with the projected portion of the limit stop 3 on the inner surface of the upper end plate 101 on the vertical plane passing through the rotation shaft 4, and overlap the gasket 9 provided on the side of the lower half of the bottom valve blade 5 facing the indoor side 16 with the projected portion of the limit stop 3 on the inner surface of the lower end plate 102 on the vertical plane passing through the rotation shaft 4.

The valve vane 5 located between the top valve vane 5 and the bottom valve vane 5 is a middle valve vane 5. Referring to fig. 7, the width f of the lower half of the middle valve blade 5 (the distance from the middle of the junction of the middle valve blade 5 with the rotating shaft 4 to the bottom of the middle valve blade 5) is equal to the width e of the upper half (the distance from the middle of the junction of the middle valve blade 5 with the rotating shaft 4 to the top of the middle valve blade 5), and the total width (f+e) of one middle valve blade 5 is generally 200 to 400mm. The width c of the lower half of the top valve vane 5 is equal to f and the width d of the upper half of the top valve vane 5 is generally 50 to 100mm. The width g of the upper half of the bottom valve vane 5 is equal to e and the width h of the lower half of the bottom valve vane 5 is generally 50 to 100mm. When reference is made to only a valve vane, this means all valve vanes.

The width c, e, f, g should ensure that the top and bottom of the valve vane 5 associated with one shaft 4 does not touch the shaft 4 adjacent to that shaft 4.

The valve blade 5 has an opening angle B of generally 30 ° to 60 ° in the open state. The opening angle B is the angle between the valve leaf 5 and the vertical plane passing through the rotation shaft 4.

Referring to fig. 5, 6 and 7, in the open state of the valve flap 5, the lower part of the lower half of the top valve flap 5 is in contact with the second positioning baffle 18 below the rotation shaft 4 where the valve flap 5 is located, and the upper part of the upper half of each of the remaining valve flaps 5 is in contact with the first positioning baffle 14 above the rotation shaft 4 where the valve flap 5 is located.

Referring to fig. 9, 10, 11 and 12, in the closed state of the valve flap 5 (antiknock valve in antiknock state), contact is made between the gasket 9 provided on the side of the upper half of the top valve flap 5 facing the outdoor side 15 and the stopper 3 on the inner surface of the upper end plate 101 to form a seal, and contact is made between the gasket 9 provided on the side of the lower half of the bottom valve flap 5 facing the indoor side 16 and the stopper 3 on the inner surface of the lower end plate 102 to form a seal. Seals are formed between adjacent valve flaps 5, in particular: between adjacent valve flaps 5, a gasket 9 provided on a side surface of a lower part of the upper valve flap 5 facing the indoor side 16 contacts with a side surface of a lower part of the upper part of the lower valve flap 5 facing the outdoor side 15 to form a seal, and a gasket 9 provided on a side surface of an upper part of the lower valve flap 5 facing the outdoor side 15 contacts with a side surface of an upper part of the lower part of the upper valve flap 5 facing the indoor side 16 to form a seal. The side surface of the middle part of the lower half of the upper valve vane 5 facing the indoor side 16 and the side surface of the middle part of the upper half of the lower valve vane 5 facing the outdoor side 15 are in contact with one valve vane baffle 12 provided between the two rotating shafts 4 where the two valve vanes 5 are located.

As is clear from the above description, when the valve blade 5 is closed, the contact points are large, the total contact area is large, and thus the stress to which all the valve blade 5, the limit stop 3, and the valve blade stop 12 are subjected is small.

In the present invention, the valve frame assembly may be provided with guard plates 13 on the left and right end plates 201 and 202 to protect the moving members of the valve blade assembly, such as the spring 11, the connecting rod 7, the rotation positioning piece 6, the rotation shaft 4, etc., from the external environment.

The use condition of the antiknock valve of the invention is as follows:

referring to fig. 5, 6 and 7, during normal ventilation, the valve blade 5 is in an initial open position by the interaction of the rotary shaft 4 and the rotary positioning piece 6, the spring 11 and the first positioning baffle 14 and the second positioning baffle 18, and air flow enters the indoor side 16 from the outdoor side 15 through the ventilation channel between the valve blades 5 with a certain opening angle B.

Referring to fig. 8, 9, 10, 11, when the opened valve leaf 5 is impacted by a positive pressure shock wave from the outdoor side 15, since the projection between adjacent valve leaves 5, 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 rotation shaft 4, the upper part of the upper half of the lower valve leaf 5 is shielded by the lower part of the lower half of the upper valve leaf 5, and the width c of the lower half of the top valve leaf 5 is larger than the width d of the upper half, resulting in that the impact force received by the top valve leaf 5 and the lower half of each middle valve leaf 5 is larger than the impact force received by the upper half. The moment generated by the difference of impact forces applied to the upper half part and the lower half part of all valve blades 5 to each rotating shaft 4 overcomes the moment generated by the tension force of a spring 11 to each rotating shaft 4 through a rotating positioning piece 6, so that the top valve blade 5 and the middle valve blade 5 drive the rotating shaft 4 where the top valve blade 5 is positioned and the rotating positioning piece 6 on the rotating shaft 4 to rotate together, and then the connecting rod 7 moves; the connecting rod 7 drives the rotary positioning sheet 6 on the rotary shaft 4 where the bottom valve blade 5 is located and the rotary shaft 4 to rotate, so that the bottom valve blade 5 rotates until all the valve blades 5 are in a closed state, and positive pressure shock waves are blocked from entering the indoor side 16.

Referring to fig. 8, 9, 10, 12, when the opened valve leaf 5 is impacted by the negative pressure shock wave from the indoor side 16, since the projection between the adjacent valve leaves 5, 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 rotation shaft 4, the lower part of the lower half of the upper valve leaf 5 is shielded by the upper part of the upper half of the lower valve leaf 5, and 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 that the impact force received by the bottom valve leaf 5 and the upper half of each middle valve leaf 5 is greater than that received by the lower half. The moment generated by the difference of impact forces applied to the upper half part and the lower half part of all valve blades 5 to each rotating shaft 4 overcomes the moment generated by the tension force of a spring 11 to each rotating shaft 4 through a rotary positioning piece 6, so that the bottom valve blade 5 and the middle valve blade 5 drive the rotating shaft 4 where the bottom valve blade 5 is positioned and the rotary positioning piece 6 on the rotating shaft 4 to rotate together, and then the connecting rod 7 moves; the connecting rod 7 drives the rotary positioning sheet 6 on the rotating shaft 4 where the top valve blade 5 is located and the rotating shaft 4 to rotate, so that the top valve blade 5 rotates until all the valve blades 5 are in a closed state, and negative pressure shock waves are blocked from entering the outdoor side 15.

Referring to fig. 5, 6 and 7, when the positive or negative pressure shock wave disappears, the spring 11 pulls the rotary positioning plate 6 to rotate through the connecting rod bolt 8, and the rotary positioning plate 6 drives the rotating shaft 4 and the valve blade 5 to rotate. The valve blade 5 is rotated to the initial open position and the antiknock valve is normally vented.

In summary, when the antiknock valve of the present invention is impacted by the positive pressure and negative pressure shock waves, the valve leaf 5 is automatically closed and reset opened under the combined action of the impact force and the spring force of the upper half and the lower half of the valve leaf 5. When the valve flap 5 is opened, the bottom is close to the outdoor side 15 and the top is close to the indoor side 16.

The large air volume refers to the air volume not less than 16000 cubic meters per hour under the conditions of 1 standard atmospheric pressure (absolute pressure), 20 ℃ and 100Pa pressure drop per unit valve body flow cross section area.

In the description of the present invention, the terms "inner", "outer", "upper", "lower", "front", "rear", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, only for convenience in describing the present invention, and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

When the antiknock valve is used, the antiknock valve is arranged at an outdoor air inlet and outlet of a ventilation air-conditioning system of an antiknock building; the anti-explosion wall can be arranged on the outer side of the anti-explosion wall, the inner side of the anti-explosion wall and the middle of the anti-explosion wall, and engineering design can be flexibly adjusted according to different conditions. The valve frame component can be additionally provided with accessories such as a ventilation grille, a ventilation elbow and the like so as to prevent explosion fragments from damaging actuating mechanisms such as valve blades 5 and the like.

Claims (10)

1. The utility model provides a big amount of wind antiknock valve of two-way protection, including valve frame subassembly and valve leaf subassembly, the valve frame subassembly includes the rectangle frame that is enclosed by upper end plate (101), lower end plate (102), left end plate (201) and right end plate (202), still including setting up limit baffle (3) on upper end plate (101) and lower end plate (102) internal surface, the valve leaf subassembly includes pivot (4), valve leaf (5) and the rotatory spacer (6) of setting in left end plate (201) outside that link to each pivot (4) divide into lower half and last half with its continuous valve leaf (5) along the axial, width c of top valve leaf (5) lower half is greater than width d of last half, its characterized in that: the valve blade subassembly sets up a set of, and limit baffle (3) set up a pair of, and width h of bottom valve blade (5) lower half is less than width g of first half, and valve frame subassembly still includes valve blade baffle (12), first location baffle (14) and second location baffle (18) that set up between left end board (201) and right end board (202), set up respectively between each adjacent two pivot (4) valve blade baffle (12), except top pivot (4), the top of every pivot (4) each set up one first location baffle (14), first location baffle (14) are close to indoor side (16) than valve blade baffle (12), be equipped with one below at top pivot (4) second location baffle (18) be close to outdoor side (15) than valve blade baffle (12), valve blade subassembly still includes spring (11) and tensioning bolt (10) that set up on left end board (201) outside, each rotary positioning piece (6) each set up through tensioning bolt (10) on rotary positioning piece (6) each rotary positioning bolt (10) between this rotary positioning bolt (8).

2. An antiknock valve according to claim 1 in which: the upper half of the top valve blade (5) is provided with a sealing gasket (9) on the side of the upper part of the upper half of each other valve blade (5) facing the outdoor side (15), and the lower half of the bottom valve blade (5) is provided with a sealing gasket (9) on the side of the lower part of the lower half of each other valve blade (5) facing the indoor side (16).

3. The antiknock valve according to claim 1 or 2, characterized in that: when the valve blades (5) are in an open state, projections of the lower part of the lower half part of the upper valve blade (5) and the upper part of the upper half part of the lower valve blade (5) on a vertical plane passing through the rotating shaft (4) are overlapped between the adjacent valve blades (5).

4. A valve according to claim 3, the width f of the lower half of the central valve vane (5) being equal to the width e of the upper half, characterized in that: the total width (f+e) of the middle valve blade (5) is 200-400 mm.

5. The antiknock valve of claim 4 wherein: the width c of the lower half part of the top valve blade (5) is equal to f, the width d of the upper half part of the top valve blade (5) is 50-100 mm, the width g of the upper half part of the bottom valve blade (5) is equal to e, and the width h of the lower half part of the bottom valve blade (5) is 50-100 mm.

6. An antiknock valve according to claim 5 in which: when the valve blade (5) is in an open state, the opening angle B is 30-60 degrees.

7. An antiknock valve according to claim 3 in which: when the valve blades (5) are in an open state, the side surface of the lower part of the top valve blade (5) facing the outdoor side (15) is contacted with a second positioning baffle (18) below the rotating shaft (4) where the valve blade (5) is positioned, and the side surface of the upper part of each other valve blade (5) facing the indoor side (16) is contacted with a first positioning baffle (14) above the rotating shaft (4) where the valve blade (5) is positioned.

8. An antiknock valve according to claim 3 in which: when the valve blades (5) are in a closed state, a sealing gasket (9) arranged on the side surface of the upper half part of the upper valve blade (5) facing the outdoor side (15) is contacted with a limit baffle (3) on the inner surface of the upper end plate (101) to form a seal, a sealing gasket (9) arranged on the side surface of the lower half part of the lower valve blade (5) facing the indoor side (16) is contacted with the limit baffle (3) on the inner surface of the lower end plate (102) to form a seal, a sealing gasket (9) arranged on the side surface of the lower half part of the upper valve blade (5) facing the indoor side (16) is contacted with the side surface of the lower part of the lower valve blade (5) facing the outdoor side (15) to form a seal, and a sealing gasket (9) arranged on the side surface of the upper half part of the upper valve blade (5) facing the indoor side (16) is contacted with the side surface of the rotary shaft (12) of the upper half part of the upper valve blade (5) facing the indoor side (15).

9. An antiknock valve according to claim 3 in which: when the valve blades (5) are in an open state, the top valve blade (5) and the lower half of each middle valve blade (5) receive a greater impact force than the upper half when impacted by a positive pressure shock wave from the outdoor side (15).

10. An antiknock valve according to any one of claims 1 to 8 in which: when the valve blades (5) are in an open state, when being impacted by negative pressure shock waves from the indoor side (16), the impact force exerted by the bottom valve blade (5) and the upper half part of each middle valve blade (5) is larger than that exerted by the lower half part.