Fixed valve with movable blade

Abstract

The invention relates to a standing valve with movable blades, which comprises a top cover, the movable blades and N support legs, one end of each support leg is fixed on the edge of the lower surface of the top cover, the other end of each support leg is fixedly connected with a tower tray, N intervals are formed along the edge of the top cover, each interval is provided with one movable blade, and the movable blades are fixed on the top cover. The upper portion of each movable blade is movably connected with the side wall of the top cover, and the left side and the right side of each movable blade abut against the two adjacent supporting legs respectively. The standing valve structure provided by the invention has the characteristics of simple structure and lower manufacturing, mounting and maintaining cost.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a fixed valve with movable blades. Background Art

[0002] Plate towers are widely used in petrochemical, fine chemical and other fields. Plate towers can be divided into floating valve towers and fixed valve towers according to the types of valves on the tower plate. The valve in the floating valve tower can have two states depending on the gas velocity: the floating and falling states of the valve. When the gas velocity is low, the gas is not enough to support the weight of the valve, and the valve is in a falling state; as the gas velocity increases, the gas has enough support to lift the valves one by one, and the valve is in a floating state. The advantage of the floating valve is that the opening area can be adjusted with the gas velocity, so it has greater operational flexibility and better anti-leakage ability under low gas velocity conditions. The main disadvantage of the floating valve tower is that the valve body is floated and dropped through two cards on the legs, so once it falls off and gets stuck, the entire valve body needs to be replaced. At the same time, the legs of the valve body are located on the tower plate and are in direct contact with the liquid phase. If it encounters a system that is easy to block or stick, the valve is also prone to getting stuck. The cost and overall maintenance cost of the floating valve are relatively high, and it is not easy to repair and replace it. The shapes of float valves include round, trapezoidal, and long strips.

[0003] The valve in the fixed valve tower is fixed on the surface of the tower plate, and the opening area is fixed and cannot be adjusted with the gas velocity. Therefore, the disadvantage of the fixed valve is that the operation flexibility is small, and there will be leakage under low gas velocity conditions. Compared with the floating valve tower, the advantage of the fixed valve tower is that the structure is relatively simple and the production cost is low. At the same time, there will be no falling off or jamming, so that the valve body needs to be replaced. In addition to the common circular structure, the fixed valve also has trapezoidal, square and other structures.

[0004] CN215428124U uses a floating valve tower plate for the waste gas absorption process, including a tower plate body and multiple groups of floating valve mechanisms arranged on the body, and multiple groups of ventilation islands are opened. The floating valve mechanism includes a fixed cover body and a floating plate, and the fixed cover body is connected to the tower plate body through multiple groups of supporting vertical rods. This technology essentially uses a floating valve tower. The rise and fall of the valve must be achieved by supporting vertical rods. If the movement of the supporting vertical rod is blocked, for example, when encountering a system that is easy to block or stick, it is easy for the valve to fail to open. In addition, when encountering a high gas flow rate, the limit arm may fall off, causing the valve to be blown off from the tower plate.

[0005] CN214913500U adopts a strip-shaped floating valve tray to prevent the floating valve from sticking. A mounting hole is provided on the tray body, and grooves are provided on the left and right sides of the inner wall of the mounting hole. By arranging a rubber pad, a guide rod and a ball, the friction between the guide sleeve and the guide rod is reduced, so that the valve leg will not stick to the inner wall of the mounting hole, and the rubber pad also has an isolation effect. The valve structure design of this method is too complicated. First, the valve body is connected to the guide rod through the groove provided on the inner wall of the mounting hole. The guide rod is connected to the inner wall of the sleeve through a ball. The outer surface is covered with a spring, and the movable plate realizes the opening and closing of the valve by the up and down movement of the spring. Any failure of the internal groove, guide rod, ball, spring, rubber pad, etc. will cause the valve to fail to work properly, and too many connecting parts lead to high manufacturing cost and installation and maintenance cost of the valve.

[0006] CN210993060U adopts a differential fixed valve plate. Through the cooperation between the thick tube, opening, inclined rod, cross rod, nut and stud, the fixed valve plate throughput can be adjusted, which can be applied to different usage needs. The defects of this technology or the shortcomings of the present invention are: the opening adjustment of this technology is to adjust the height of the cross rod through the cooperation between the second cross tube, stud, nut and two inclined rods. The structure of this invention is relatively complex. Although it can play a role in the size of the conditional opening, it has too many connectors and conduction devices inside the fixed valve, which deviates from the characteristics of the fixed valve with simple structure, low cost and maintenance cost. Summary of the invention

[0007] The object of the present invention is to provide a fixed valve with movable blades to solve the problems of low operating flexibility and liquid leakage under low gas velocity conditions in the fixed valve tower in the prior art, as well as the replacement and maintenance problems caused by valve falling off and jamming of the floating valve tower.

[0008] To achieve the above-mentioned purpose, the present invention provides a fixed valve with movable blades, including a top cover, movable blades and support legs, one end of the support legs is fixed to the edge of the lower surface of the top cover, and the other end is fixedly connected to the tower plate. The number of the support legs is N, and N intervals are formed along the edge of the top cover. Each interval is provided with a movable blade, and the upper part of each movable blade is movably connected to the side wall of the top cover. The left and right sides of each movable blade are respectively placed on two adjacent support legs.

[0009] The fixed valve of the present invention adopts a detachable design for the movable blades. Once a problem occurs, only the blades need to be replaced without replacing the entire valve, and the cost of later inspection, repair and maintenance is low. The blades do not directly contact the materials on the tray, so the blades are less likely to get stuck or stick, solving the replacement and maintenance problems of the floating valve caused by the stuck valve.

[0010] In the fixed valve with movable blades described in the present invention, at least one door stop is provided at the lower left corner and the lower right corner of each movable blade, and the left and right sides of the movable blade are respectively rested on two adjacent legs through the door stops.

[0011] The inclination angle of the blades to the vertical angle is called the blade opening and closing angle. Under low gas velocity conditions, the blades are in a naturally closed state due to the effect of gravity. At this time, the tower plate has the minimum opening area, and the movable blades have the minimum opening and closing angle. The minimum blade opening and closing angle can be 3 degrees to 15 degrees. Under high gas velocity conditions, the gas phase has a large enough thrust to push the movable blades open. When the gas velocity reaches a large enough level, the blades can be fully opened. At this time, the tower plate has the maximum opening area, and the movable blades have the maximum opening and closing angle. The maximum opening and closing angle of the movable blades can be 80 degrees to 120 degrees. The door bump can be placed on the legs when the blades are in a naturally closed state. The main functions of the door bump are two: one is to prevent the blades from being completely closed, so that the gas cannot pass through and cause pressure; the other is that the door bump can prevent the blades from being blown inward by the gas (at this time, the blade opening and closing angle is a negative number), thereby causing internal leakage.

[0012] In the fixed valve with movable blades of the present invention, each movable blade is movably connected to the side wall of the top cover via a connecting rod.

[0013] The fixed valve with movable blades described in the present invention has the connecting rods arranged on the left and right sides of the upper part of each movable blade, the side wall of the top cover is provided with grooves matching the connecting rods, and the connecting rods are inserted into the grooves to realize the movable connection between the movable blades and the top cover.

[0014] The fixed valve with movable blades of the present invention has a sleeve for the connecting rod to pass through on the upper edge of each movable blade, a groove matching the sleeve is provided on the side wall of the top cover, the sleeve can be placed in the groove, and the connecting rod passes through the sleeve and the groove to realize the movable blade and the top cover to be movably connected. The sleeve can be integrally formed with the movable blade or fixed on the movable blade through later processing, the sleeve can be equal in length to the upper edge of the movable blade, or can be only provided at both ends of the movable blade, or can be provided at intervals on the upper edge of the movable blade, the groove on the side wall of the top cover matches the shape of the sleeve, and small holes are provided on the side walls of the top cover on the left and right sides of the groove, which are connected to the groove and for the connecting rod to pass through, and the movable blade and the top cover are movably connected together by the connecting rod through the small holes.

[0015] In the fixed valve with movable blades of the present invention, the top cover is circular, the movable blades are arc-shaped, and the curvature of the movable blades is the same as that of the top cover.

[0016] The fixed valve with movable blades of the present invention has a top cover with a diameter of 20-60 mm and a thickness of 0.5-2.5 mm.

[0017] In the fixed valve with movable blades described in the present invention, the support legs have a height of 4-25 mm, a width of 3-8 mm, and a thickness of 0.5-2.5 mm.

[0018] The fixed valve with movable blades of the present invention has a length of 30-55 mm, a width of 4-25 mm, and a thickness of 0.5-2.5 mm.

[0019] The fixed valve with movable blades of the present invention has a width of the movable blades that is less than or equal to a height of the supporting legs.

[0020] The distance that the movable blade extends in the radial direction of the top cover is called the width of the blade. It is very important to select the appropriate width and thickness of the movable blade according to different systems. Usually, a larger movable blade width is selected for a system with a larger gas phase flow rate and a smaller liquid phase flow rate. Conversely, a smaller movable blade width is selected for a system with a smaller gas phase flow rate and a larger liquid phase flow rate. The appropriate interval range is selected according to the system with different gas and liquid phase flow rates.

[0021] The width of the movable blade is less than or equal to the height of the leg, which can prevent the occurrence of tailing and scraping the tower plate. The material of the movable blade can be carbon steel, stainless steel (including but not limited to 304 stainless steel, 316L stainless steel, polished stainless steel, etc.), and polytetrafluoroethylene, functional ceramics, special ceramics, etc. can also be selected for corrosive systems.

[0022] In the fixed valve with movable blades of the present invention, the width of the movable blades is 0.5 mm to 1.5 mm lower than the height of the supporting legs.

[0023] The fixed valve with movable blades described in the present invention has 2-8 legs.

[0024] The fixed valve with movable blades of the present invention has an opening and closing angle of 3 to 15 degrees when the movable blades naturally rest on the supporting legs.

[0025] The fixed valve with movable blades described in the present invention has a connecting rod with a length of 32-58 mm and a diameter of 0.5-2.5 mm.

[0026] Beneficial effects of the present invention:

[0027] The present invention aims at the advantages and disadvantages of the float valve and the fixed valve respectively, and designs a novel fixed valve structure with movable blades, which not only overcomes the disadvantages of the fixed valve having low operating elasticity and liquid leakage under low gas velocity conditions, but also overcomes the disadvantage of the float valve having high maintenance cost due to the need to replace the entire valve body due to jamming and falling off.

[0028] The fixed valve structure provided by the present invention has the characteristics of simple structure and low manufacturing, installation and maintenance costs; it can be naturally closed under low gas velocity conditions and has a small opening area, which can solve the common leakage problem on the tower plate under low gas velocity conditions; it can be opened to increase the opening and closing angle under high gas velocity conditions, which solves the problem of excessive pressure drop on the tower plate under high gas velocity conditions and increases operational flexibility; unlike the rising and falling connecting rod of the floating valve located on the tower plate, the blades of the present invention are movably connected and located at the upper end of the valve body and are not in direct contact with the material, so that the problem of the valve being unable to open due to easy blockage or easy adhesion of materials can be overcome, and the replacement and maintenance problems of the floating valve caused by jamming are solved. The valve body of the present invention is a fixed valve, which avoids the problem of the floating valve body falling off, and the blades are detachable in design. Once a problem occurs, only the blades need to be replaced without replacing the entire valve, and the subsequent inspection, repair and maintenance costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a top view (close to a closed state) of the fixed valve of the present invention.

[0030] Figure 2 It is a schematic diagram of a top view (fully open state) of the fixed valve of the present invention.

[0031] Figure 3 is a schematic side view of a fixed valve of the present invention;

[0032] Figure 4 It is a schematic diagram of a fixed valve whose blades cannot be opened or closed.

[0033] Wherein, the reference numerals are:

[0034] 1. Top cover; 2. Movable blades; 3. Support legs; 4. Connecting rod; 5. Door stop; 6. Blade opening and closing angle. DETAILED DESCRIPTION

[0035] The present invention is described in detail below by way of examples. It is necessary to point out that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Those skilled in the art in this field can make some non-essential improvements and adjustments to the present invention based on the above content of the present invention.

[0036] Please refer to Figures 1 to 3The fixed valve with movable blades provided by the present invention comprises a top cover 1, three legs 3 are fixed at the edge of the lower surface of the top cover 1, a movable blade 2 is provided between every two legs 3, connecting rods 4 are provided on the left and right sides of the root of the movable blade 2, and a groove (not shown in the figure) that is not matched with the connecting rod is provided on the side wall of the top cover for inserting the connecting rod. The movable blade 2 is movably fixed on the top cover 1 through the connecting rod 4 and the groove, and a door stop 5 is provided at the lower left corner and the lower right corner of the inner side of the movable blade 2. When the movable blade 2 falls naturally, the door stop 5 rests on the legs 3 on both sides.

[0037] In a specific embodiment, the top cover has a diameter of 20-60 mm and a thickness of 0.5-2.5 mm.

[0038] In a specific embodiment, the height of the support leg 3 is 4-25 mm, the width of the support leg 4 is 3-8 mm, and the thickness is 0.5-2.5 mm.

[0039] In a specific embodiment, the movable blade 2 has a length of 30-55 mm, a width of 4-25 mm, and a thickness of 0.5-2.5 mm.

[0040] In a specific embodiment, the connecting rod 4 has a length of 32-58 mm and a diameter of 0.5-2.5 mm.

[0041] In a specific embodiment, the width of the movable blade 2 is less than or equal to the height of the leg 3 .

[0042] In a specific embodiment, the width of the movable blade 2 is 0.5 mm to 1.5 mm lower than the height of the leg 3 .

[0043] In a specific embodiment, when the movable blade 2 naturally rests on the support leg 3, the opening and closing angle 6 of the movable blade 2 is 3 degrees to 15 degrees.

[0044] Example 1

[0045] This embodiment adopts Figures 1 to 3 The fixed valve tray design with movable blades shown in the figure has a top cover height of 10mm from the tray plane, a top cover diameter of 48mm, and a top cover thickness of 1.5mm; the leg height is 10mm, the leg width is 6mm, and the leg plate thickness is 1.5mm. The movable blade length is 44mm, the movable blade width is 9mm, and the movable blade thickness is 1.5mm. The connecting rod length is 44mm and the connecting rod diameter is 2mm. The entire valve, including the legs, blades, and top cover, is made of 304L stainless steel.

[0046] The system used in the experiment of this embodiment is an air / water system, the system pressure is normal pressure, the gas flow rate (the flow rate through the opening) is 0.063m / s, and the liquid phase flow rate is 6.38m / s. 3 / h. Under the operating conditions of the present embodiment, the gas phase flow rate is small and the liquid phase flow rate is large. The operating condition is in the leakage interval of the tower tray. When using a fixed valve or a sieve plate, the tower tray will have a large leakage. Under this operating condition, the gas phase flow rate is not enough to open the movable blades. The movable blades are in a closed state. The gap between the blade below and the tower plate plane and the gap between the door bump and the legs form a space for the gas phase to pass through. The valve opening area is 14%, and the valve has the smallest opening area. Therefore, the leakage can be minimized under this operating condition. The leakage rate measured under this operating condition is 7.8%. The opening area is defined as the area through which the gas phase can pass / the area when the valve is fully opened. The leakage rate is defined as the flow rate / total liquid phase flow rate of the liquid leaking to the lower tower plate through the opening.

[0047] Example 2

[0048] This embodiment adopts the valve design of the same size as that of Embodiment 1, that is, the height of the top cover from the tower plate plane is 10mm, the top cover diameter is 48mm, and the top cover thickness is 1.5mm; the leg height is 10mm, the leg width is 6mm, and the leg plate thickness is 1.5mm. The length of the movable blade is 44mm, the width of the movable blade is 9mm, and the thickness of the movable blade is 1.5mm. The length of the connecting rod is 44mm, and the diameter of the connecting rod is 2mm. The entire valve, including the legs, blades, top cover, etc., is made of 304L stainless steel.

[0049] The system used in the experiment of this embodiment is the same air / water system as in embodiment 1, the system pressure is normal pressure, the gas flow rate (the flow rate through the opening) is 0.315m / s, the liquid phase flow rate is 6.38m / s 3 / h. Under the operating conditions of this embodiment, the gas phase flow rate is equivalent to the liquid phase flow rate. The operating condition is in the high gas-liquid flow rate range of the tower plate. If a small opening area is maintained, the tower pressure drop will be too large, and in severe cases, it will cause liquid flooding. Under this operating condition, the gas phase flow rate can open the movable blade to the maximum. Under this condition, the valve opening area is 100%, and the pressure drop is 101mm water column (0.98KPa) per plate.

[0050] Example 3

[0051] This embodiment adopts Figures 1 to 3The fixed valve tray design with movable blades shown in the figure has a top cover height of 10mm from the tray plane, a top cover diameter of 48mm, and a top cover thickness of 1.5mm; the leg height is 10mm, the leg width is 6mm, and the leg plate thickness is 1.5mm. The movable blade length is 44mm, the movable blade width is 9mm, and the movable blade thickness is 1.5mm. The connecting rod length is 44mm and the connecting rod diameter is 2mm. The entire valve, including the legs, blades, and top cover, is made of corrosion-resistant polytetrafluoroethylene.

[0052] The material system used in the experiment of this embodiment is a system of lactic acid and air, which is a weakly corrosive substance. The system pressure is normal pressure, the gas flow rate (the flow rate through the opening) is 0.063m / s, and the liquid phase flow rate is 6.38m / s. 3 / h. Under the operating conditions of the present embodiment, the gas phase flow rate is small and the liquid phase flow rate is large. The operating condition is in the leakage interval of the tower tray. When using a fixed valve or a sieve plate, the tower tray will have a large leakage. Under this operating condition, the gas phase flow rate is not enough to open the movable blades. The movable blades are in a closed state. The gap between the blade below and the tower plate plane and the gap between the door bump and the legs form a space for the gas phase to pass through. The valve opening area is 14%, and the valve has the smallest opening area. Therefore, the leakage can be minimized under this operating condition. The leakage rate measured under this operating condition is 7.8%. The opening area is defined as the area through which the gas phase can pass / the area when the valve is fully opened. The leakage rate is defined as the flow rate / total liquid phase flow rate of the liquid leaking to the lower tower plate through the opening.

[0053] Example 4

[0054] This embodiment adopts Figures 1 to 3 The fixed valve tray design with movable blades shown in the figure has a top cover height of 10mm from the tray plane, a top cover diameter of 48mm, and a top cover thickness of 1.5mm; the leg height is 10mm, the leg width is 6mm, and the leg plate thickness is 1.5mm. The movable blade length is 44mm, the movable blade width is 9mm, and the movable blade thickness is 1.5mm. The connecting rod length is 45mm and the connecting rod diameter is 2mm. The entire valve, including the legs, blades, and top cover, is made of 304L stainless steel.

[0055] The system used in the experiment of this embodiment is an air / water system, the system pressure is normal pressure, the gas flow rate (the flow rate through the opening) is 0.063m / s, and the liquid phase flow rate is 6.38m / s. 3 / h. Under the operating conditions of the present embodiment, the gas phase flow rate is small and the liquid phase flow rate is large. The operating condition is in the leakage interval of the tower tray. When using a fixed valve or a sieve plate, the tower tray will have a large leakage. Under this operating condition, the gas phase flow rate is not enough to open the movable blades. The movable blades are in a closed state. The gap between the blade below and the tower plate plane and the gap between the door bump and the legs form a space for the gas phase to pass through. The valve opening area is 14%, and the valve has the smallest opening area. Therefore, the leakage can be minimized under this operating condition. The leakage rate measured under this operating condition is 7.8%. The opening area is defined as the area through which the gas phase can pass / the area when the valve is fully opened. The leakage rate is defined as the flow rate / total liquid phase flow rate of the liquid leaking to the lower tower plate through the opening.

[0056] Example 5

[0057] This embodiment adopts Figures 1 to 3 The fixed valve tray design with movable blades shown in the figure has a top cover height of 4.5mm from the tray plane, a top cover diameter of 22mm, and a top cover thickness of 0.5mm; the leg height is 4.5mm, the leg width is 3mm, and the leg plate thickness is 0.5mm. The movable blade length is 30mm, the movable blade width is 4mm, and the movable blade thickness is 0.5mm. The connecting rod length is 31mm and the connecting rod diameter is 0.5mm. The entire valve, including the legs, blades, and top cover, is made of 304L stainless steel.

[0058] The system used in the experiment of this embodiment is the same air / water system as in embodiment 1, the system pressure is normal pressure, the gas flow rate (the flow rate through the opening) is 0.15m / s, the liquid phase flow rate is 3.04m / s 3 / h. Under the operating conditions of this embodiment, the gas phase flow rate is equivalent to the liquid phase flow rate. The operating condition is in the high gas-liquid flow rate range of the tower plate. If a small opening area is maintained, the tower pressure drop will be too large, and in severe cases, it will cause liquid flooding. Under this operating condition, the gas phase flow rate can open the movable blade to the maximum. Under this condition, the valve opening area is 100%, and the pressure drop is 105mm water column (1.02KPa) per plate.

[0059] Example 6

[0060] This embodiment adopts Figures 1 to 3 The fixed valve tray design with movable blades shown in the figure has a top cover height of 20mm from the tray plane, a top cover diameter of 60mm, and a top cover thickness of 2.5mm; the leg height is 24mm, the leg width is 8mm, and the leg plate thickness is 2.5mm. The movable blade length is 55mm, the movable blade width is 24mm, and the movable blade thickness is 2.5mm. The connecting rod length is 57mm and the connecting rod diameter is 2.5mm. The entire valve, including the legs, blades, and top cover, is made of 304L stainless steel.

[0061] The system used in the experiment of this embodiment is an air / water system, the system pressure is normal pressure, the gas flow rate (the flow rate through the opening) is 0.1m / s, and the liquid phase flow rate is 10.2m / s. 3 / h. Under the operating conditions of the present embodiment, the gas phase flow rate is small and the liquid phase flow rate is large. The operating condition is in the leakage interval of the tower tray. When using a fixed valve or a sieve plate, the tower tray will have a large leakage. Under this operating condition, the gas phase flow rate is not enough to open the movable blades. The movable blades are in a closed state. The gap between the blade below and the tower plate plane, as well as the gap between the door and the legs, form a space for the gas phase to pass through. The valve opening area is 13.8%, and the valve has the smallest opening area. Therefore, the leakage can be minimized under this operating condition. The leakage rate measured under this operating condition is 7.5%. The opening area is defined as the area through which the gas phase can pass / the area when the valve is fully opened. The leakage rate is defined as the flow rate / total liquid phase flow rate of the liquid leaking to the lower tower plate through the opening.

[0062] Comparative Example 1

[0063] This comparative example adopts a fixed valve tray design with non-openable blades. Figure 4 As shown, the blades and the top cover are processed in an integrated manner. There is no connecting rod between the blades and the top cover, and the blades cannot be opened. The height of the top cover from the tower plate plane is 10mm, the diameter of the top cover is 48mm, and the thickness of the top cover is 1.5mm; the height of the legs is 10mm, the width of the legs is 6mm, and the thickness of the leg plate is 1.5mm. The length of the blade is 44mm, the width of the blade is 9mm, and the thickness of the blade is 1.5mm. The gap between the bottom of the blade and the tower plate plane, as well as the gap between the door and the legs, form a space for the gas phase to pass through, and the valve opening area is 14%. The entire valve, including the legs, blades, and top cover, is made of 304L stainless steel.

[0064] The system used in this comparative experiment is an air / water system, the system pressure is normal pressure, the gas flow rate (the flow rate through the opening) is 0.063m / s, and the liquid phase flow rate is 6.38m / s. 3 / h. Under the operating conditions of this comparative example, the gas phase flow rate is small and the liquid phase flow rate is large. The operating condition is in the leakage range of the tower plate. When a fixed valve or sieve plate is used, the tower plate will have a large leakage. The leakage rate measured under this condition is 15.1%. The opening area is defined as the area through which the gas phase can pass / the area when the valve is fully open. The leakage rate is defined as the flow rate of the liquid leaking through the opening to the lower tower plate / the total liquid phase flow rate.

[0065] Comparative Example 2

[0066] This comparative example 2 adopts the same fixed valve tray design as comparative example 1, and the design is as follows Figure 4As shown, the blade is fixed on the valve and cannot be opened. The height of the top cover from the tower plate plane is 10mm, the diameter of the top cover is 48mm, and the thickness of the top cover is 1.5mm; the height of the leg is 10mm, the width of the leg is 6mm, and the thickness of the leg plate is 1.5mm. The length of the blade is 44mm, the width of the blade is 9mm, and the thickness of the blade is 1.5mm. The gap between the bottom of the blade and the tower plate plane, as well as the gap between the door and the leg, form a space for the gas phase to pass through, and the valve opening area is 14%. The entire valve, including the legs, blades, top cover, etc., are made of 304L stainless steel.

[0067] The system used in this comparative experiment is the same air / water system as in Example 2, the system pressure is normal pressure, the gas flow rate (the flow rate through the opening) is 0.315 m / s, the liquid phase flow rate is 6.38 m / s 3 / h. Under the operating conditions of this comparative example, the gas phase flow rate is equivalent to the liquid phase flow rate. The operating condition is in the high gas-liquid flow rate range of the tower plate. If a small opening area is maintained, the tower pressure drop will be too large. Under this operating condition, the pressure drop is 286mm water column (2.77KPa) per plate.

[0068] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. A fixed valve with a movable blade, characterized in that: include: A top cover, movable blades and legs, one end of the legs is fixed to the edge of the lower surface of the top cover, and the other end is fixedly connected to the tower plate. The number of the legs is N, and N intervals are formed along the edge of the top cover. Each interval is provided with a movable blade. The upper part of each movable blade is movably connected to the side wall of the top cover, and the left and right sides of each movable blade rest on two adjacent legs respectively.

2. The fixed valve with movable blades according to claim 1, characterized in that: At least one door stop is arranged at the lower left corner and the lower right corner of each movable blade, and the left and right sides of the movable blade are respectively placed on two adjacent supporting legs through the door stops.

3. The fixed valve with movable blades according to claim 1, characterized in that: Each movable blade is movably connected to the side wall of the top cover via a connecting rod.

4. The fixed valve with movable blades according to claim 3, characterized in that: The connecting rod is arranged on the left and right sides of the upper part of each movable blade, and the side wall of the top cover is provided with a groove matching the connecting rod, and the connecting rod is inserted into the groove to realize the movable connection between the movable blade and the top cover.

5. The fixed valve with movable blades according to claim 3, characterized in that: The upper edge of each movable blade is provided with a sleeve for the connecting rod to penetrate, and the side wall of the top cover is provided with a groove matching the sleeve. The sleeve can be placed in the groove, and the connecting rod passes through the sleeve and the groove to realize the movable connection between the movable blade and the top cover.

6. The fixed valve with movable blades according to claim 1, characterized in that: The top cover is circular, the movable blades are arc-shaped, and the curvature of the movable blades is the same as that of the top cover.

7. The fixed valve with movable blades according to claim 1, characterized in that: The top cover has a diameter of 20-60 mm and a thickness of 0.5-2.5 mm.

8. The fixed valve with movable blades according to claim 1, characterized in that: The legs have a height of 4-25 mm, a width of 3-8 mm, and a thickness of 0.5-2.5 mm.

9. The fixed valve with movable blades according to claim 1, characterized in that: The movable blade has a length of 30-55 mm, a width of 4-25 mm, and a thickness of 0.5-2.5 mm.

10. The fixed valve with movable blades according to claim 1, characterized in that: The width of the movable blade is less than or equal to the height of the supporting leg.

11. The fixed valve with movable blades according to claim 10, characterized in that: The width of the movable blade is 0.5 mm to 1.5 mm lower than the height of the leg.

12. The fixed valve with movable blades according to claim 1, characterized in that: The number of the legs is 2-8.

13. The fixed valve with movable blades according to claim 2, characterized in that: When the movable blades naturally rest on the supporting legs, the opening and closing angles of the movable blades are 3 degrees to 15 degrees.

14. The fixed valve with movable blades according to claim 4, characterized in that: The connecting rod has a length of 32-58 mm and a diameter of 0.5-2.5 mm.

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