Low-leakage high-strength electric heating air valve for nuclear power station

Abstract

The invention belongs to the technical field of nuclear power station ventilation systems, and particularly relates to a low-leakage high-strength electric heating air valve for a nuclear power station. Comprising a valve body, a side sealing valve seat, a butterfly plate, a solid rotating shaft, a connecting rod mechanism, an executing mechanism, a power junction box and a coupler. Side sealing valve seats are arranged on two sides of the valve body; the butterfly plate penetrates through holes in the valve body and the side sealing valve seat to be installed in the valve body. The solid rotating shaft penetrates into the butterfly plate through the valve body and is locked; a plurality of butterfly plate extension electrical parts and the power supply junction box form a parallel circuit, so that the butterfly plate can heat after being electrified; the connecting rod mechanism is fixed on the plurality of solid rotating shafts; the executing mechanism is connected with the connecting rod mechanism and the solid rotating shaft through a coupler to drive opening and closing of the butterfly plate. The air valve blade can be heated and deiced more effectively, the reliable sealing performance of the valve is guaranteed, and meanwhile the overall strength of the air valve is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ventilation systems of nuclear power plants, and in particular relates to a low-leakage and high-strength electric heating air valve for nuclear power plants. Background Art

[0002] In the low temperature, rain and snow environment in winter, the electrically heated valves of nuclear power plants can heat the valve blades through electric heating cables to prevent the valve blades from freezing and being unable to open, thereby ensuring the normal operation of the nuclear power plant ventilation system.

[0003] In the past, electric heating valves often melt ice by wrapping heating elements around blades or arranging heating elements inside the shaft, resulting in high heat loss and unconcentrated heat.

[0004] Most electric heating valves use rubber seals between blades. During the heating process of the blades, the blade sealing rubber will age faster. As the equipment operating time increases, the risk of valve seal failure increases and the valve leakage rate increases.

[0005] In some newly built nuclear power plants in China, electric heating valves are required to be larger in size. The previous structure of electric heating valves could not meet the strength requirements of the equipment. Simply increasing the strength of the valve by thickening the valve body and blade materials would increase the weight of the equipment and investment costs. Summary of the invention

[0006] The purpose of the present invention is to provide a low-leakage and high-strength electrically heated air valve for use in nuclear power plants, which can more effectively heat and melt ice on the air valve blades, ensure reliable sealing performance of the valve, and improve the overall strength of the air valve.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A low-leakage, high-intensity electric heating air valve for a nuclear power plant comprises a valve body, a side sealing valve seat, a butterfly plate, a real rotating shaft, a connecting rod mechanism, an actuator, a power supply junction box and a coupling; the side sealing valve seats are placed on both sides of the valve body; the butterfly plate is installed in the valve body through holes on the valve body and the side sealing valve seat; the real rotating shaft penetrates the butterfly plate through the valve body and is locked; a plurality of butterfly plate extended electrical parts form a parallel circuit with the power supply junction box, so that the butterfly plate can generate heat after power is supplied; the connecting rod mechanism is fixed on the plurality of real rotating shafts; the actuator is connected to the connecting rod mechanism and the real rotating shaft through a coupling to drive the opening and closing of the butterfly plate.

[0009] The valve body consists of an upper frame, a lower frame and two side frames, which are connected by welding or fasteners.

[0010] The upper frame is welded together by an upper valve frame with an oblique convex cross section, an upper rib plate A welded to both ends of the upper valve frame, and an upper rib plate B inside the upper valve frame.

[0011] The lower frame is welded together by a lower valve frame with an oblique concave cross section, a lower rib plate A welded to both ends of the lower valve frame, and a lower rib plate B inside the lower valve frame.

[0012] The side frame is welded by a side valve frame with a [-shaped cross section and a side rib plate inside the side valve frame.

[0013] The butterfly plate is composed of blades, blade skeletons, sealing sheets, idle shafts, fastening mechanisms and electric heating cables; the blades are fixed to the upper and lower surfaces of the blade skeletons; the blade skeletons and the idle shafts form a cavity, the electric heating cables are arranged in the cavity and wrapped around the edge of the butterfly plate; the idle shaft is a through-hole structure, the electric heating cables are led out of the valve body and connected to the power connection box; the fastening mechanism is composed of a clamping bolt and a pressure plate, the clamping bolts are used to clamp the pressure plate in the blade skeleton through the threaded holes on the blade skeleton, so that the electric heating cables are close to the outside of the butterfly plate The blade skeleton has an oblong hole-shaped cross section, one side is in an arc shape, and the other side is in a "3" shape. The convex part of the arc side can fit tightly with the concave part of the "3" shaped side. The "3" shaped side is wrapped by a sealing sheet. When the valve is closed, the butterfly plate wrapped by the sealing sheet on the "3" shaped side is squeezed and matched by the butterfly plate on the convex part of the arc side to achieve a labyrinth seal. The side sealing valve seat is an arch bridge-shaped spring stainless steel sheet. When the valve is closed, the arc side of the blade skeleton fits tightly with the arch bridge-shaped sealing valve seat to achieve sealing.

[0014] The sealing sheet is made of metal sheet.

[0015] One end of the real rotating shaft is clamped with a butterfly plate by a fastener so as to rotate along with it, and the other end is fixed on the side frame by a fastener through a bearing seat with a bearing.

[0016] One end of the idle shaft is clamped with the blade and the blade skeleton by fasteners, and the other end is fixed to the side frame by fasteners through a bearing seat with a bearing.

[0017] The blade skeleton is composed of an exoskeleton frame, transverse skeletons and vertical skeletons welded together.

[0018] The beneficial effects achieved by the present invention are:

[0019] By improving the blades of the electric heating valve into a cavity structure, the electric heating cable is arranged along the inside of the blade, which reduces the heat loss during heating of the heating cable and improves the utilization rate of heat.

[0020] By using a fastening device to ensure that the electric heating cable fits tightly inside and around the blade, the heat is directly transferred to the most vulnerable part (around the blade), which has a better ice melting effect.

[0021] By improving the blade edge to a concave-convex structure, the blades can be closely fitted when the valve is closed, reducing leakage between the valve blades.

[0022] By adding a metal sealing sheet to the concave edge of the blade, an elastic labyrinth seal is formed between the blades, further enhancing the sealing effect between the valve blades;

[0023] By improving the seal between the valve body and the blade to an "arch bridge-shaped" metal seal, the commonly used rubber seal is replaced, solving the problem of increased leakage caused by aging of the sealing rubber after the blade is heated;

[0024] The blade skeleton is improved to a dense rib structure, which improves the strength of the blade body without increasing the thickness and weight of the blade.

[0025] The valve body side frame is improved to a dense rib structure to increase the overall strength of the valve and solve the problem of insufficient overall strength of larger size valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 for Figure 1 Left view of

[0028] Figure 3 for Figure 1 Sectional view of the middle AA plane;

[0029] Figure 4 for Figure 1 Sectional view of the middle BB plane;

[0030] Figure 5 It is a schematic diagram of the valve body structure;

[0031] Figure 6 It is a schematic diagram of the upper frame structure;

[0032] Figure 7 It is a schematic diagram of the lower frame structure;

[0033] Figure 8 It is a schematic diagram of the side frame structure;

[0034] Fig. 9 It is a three-dimensional cross-sectional view of the butterfly plate of the present invention;

[0035] Fig.10 for Figure 1 A magnified view of the local structure at position I in the middle;

[0036] Fig.11 for Figure 3 A magnified view of the local structure at II in the middle;

[0037] Fig.12 for Figure 4 A magnified view of the local structure at III in the middle;

[0038] Fig.13 for Figure 4 A magnified view of the local structure at position IV in the middle;

[0039] Fig.14 Schematic diagram of leaf skeleton structure. DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] (like Figures 1 to 4 The present invention is a low-leakage and high-strength electric heating air valve for a nuclear power plant, comprising a valve body 100, a side sealing valve seat 200, a butterfly plate 300, a real rotating shaft 400, a connecting rod mechanism 500, an actuator 600, a power junction box 700 and a coupling 800.

[0042] Furthermore, side sealing valve seats 200 are placed on both sides of the valve body 100 of the electric heating air valve;

[0043] Further, the butterfly plate 300 is installed in the valve body 100 through the holes on the valve body 100 and the side sealing valve seat 200;

[0044] Furthermore, the real rotating shaft 400 passes through the other side of the valve body 100 and penetrates into the clamping butterfly plate 300 and is locked by bolts;

[0045] Furthermore, the electrical parts of the plurality of butterfly plates 300 and the power junction box 700 form a parallel circuit, so that the butterfly plates 300 can generate heat after being powered on;

[0046] Furthermore, the connecting rod mechanism 500 is fixed to the plurality of real rotating shafts 400 by bolts;

[0047] Furthermore, the actuator 600 is connected to the connecting rod mechanism 500 and the real rotating shaft 400 through the coupling 800 to drive the butterfly plate 300 to open and close.

[0048] (like Figures 5 to 8 As shown), the valve body 100 is composed of an upper frame 110, a lower frame 120 and two side frames 130, which can be connected by welding or fasteners;

[0049] Furthermore, the upper frame 110 is formed by welding an upper valve frame 111 with an oblique convex cross-section, an upper rib plate A112 welded to both ends of the upper valve frame 111 , and an upper rib plate B113 inside the upper valve frame 111 .

[0050] Furthermore, the lower frame 120 is formed by welding a lower valve frame 121 with a “concave” cross-section, a lower rib plate A122 welded to both ends of the lower valve frame 121 , and a lower rib plate B123 inside the lower valve frame 121 .

[0051] Furthermore, the side frame 130 is formed by welding a side valve frame 131 having a “[”-shaped cross section and a side rib plate 132 inside the side valve frame 131 .

[0052] (like Figures 9-11 As shown), the butterfly plate 300 is composed of a blade 310, a blade skeleton 320, a sealing sheet 330, an idle shaft 360, a fastening mechanism 340 and an electric heating tape 350.

[0053] Furthermore, the blade 310 is fixed to the upper and lower surfaces of the blade skeleton 320 by bolts;

[0054] Furthermore, the blade skeleton 320 and the idle shaft 360 form a cavity, and the electric heating tape 350 is arranged in the cavity and wrapped around the edge of the butterfly plate 300.

[0055] Furthermore, the idle shaft 360 is a through-hole structure, and the electric heating cable 350 can be led out of the valve body 100 and connected to the power connection box 700.

[0056] (like Fig.10 As shown), the fastening mechanism 340 is composed of a clamping bolt 341 and a pressure plate 342. The clamping bolt 341 presses the pressure plate 342 inside the blade skeleton 320 through the threaded hole on the blade skeleton 320, so that the electric heating belt 350 is close to the outer edge of the butterfly plate 300.

[0057] (like Fig.11 As shown), the cross section of the blade skeleton 320 is in the shape of an oblong hole, but one side is in the shape of an arc, and the other side is in the shape of a "3", and the "convex" part of the arc side and the "concave" part of the "3" side can fit tightly;

[0058] Further, the "3"-shaped side is wrapped by a sealing sheet 330;

[0059] Furthermore, the sealing sheet 330 is made of a metal sheet. When the valve is closed, the butterfly plate (300) wrapped by the sealing sheet 330 on the "3"-shaped side is squeezed and matched by the butterfly plate 300 on the "convex" part of the arc side to achieve a "labyrinth" seal.

[0060] (like Fig.12 As shown), the side sealing valve seat 200 is an "arch bridge" type spring stainless steel sheet. When the valve is closed, the arc side of the blade skeleton 320 fits tightly with the "arch bridge" type sealing valve seat 200 to achieve sealing.

[0061] Furthermore, one end of the real rotating shaft 400 is clamped to the butterfly plate 300 by a fastener so as to rotate therewith, and the other end is fixed to the side frame 130 by a fastener through a bearing seat with a bearing.

[0062] (like Fig.13As shown), one end of the idle shaft 360 is clamped to the blade 310 and the blade skeleton 320 by fasteners, and the other end is fixed to the side frame 130 by fasteners through a bearing seat with a bearing.

[0063] (like Fig.14 As shown), the blade skeleton 320 is composed of an exoskeleton frame 321, a transverse skeleton 322 and a vertical skeleton 323 welded together.

Claims

1. A low leakage and high strength electric heating air valve for nuclear power plants, characterized in that: It includes a valve body, a side sealing valve seat, a butterfly plate, a real rotating shaft, a connecting rod mechanism, an actuator, a power connection box and a coupling; side sealing valve seats are placed on both sides of the valve body; the butterfly plate is installed in the valve body through the holes on the valve body and the side sealing valve seat; the real rotating shaft passes through the valve body to penetrate the butterfly plate and is locked; multiple butterfly plate extended electrical parts form a parallel circuit with the power connection box, so that the butterfly plate can generate heat after power is turned on; the connecting rod mechanism is fixed on multiple real rotating shafts; the actuator is connected with the connecting rod mechanism and the real rotating shaft through the coupling to drive the opening and closing of the butterfly plate.

2. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 1 is characterized in that: The valve body consists of an upper frame, a lower frame and two side frames, which are connected by welding or fasteners.

3. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 2 is characterized in that: The upper frame is welded together by an upper valve frame with an oblique convex cross section, an upper rib plate A welded to both ends of the upper valve frame, and an upper rib plate B inside the upper valve frame.

4. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 2 is characterized in that: The lower frame is welded together by a lower valve frame with an oblique concave cross section, a lower rib plate A welded to both ends of the lower valve frame, and a lower rib plate B inside the lower valve frame.

5. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 2 is characterized in that: The side frame is welded by a side valve frame with a [-shaped cross section and a side rib plate inside the side valve frame.

6. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 2 is characterized in that: The butterfly plate is composed of blades, blade skeletons, sealing sheets, idle shafts, fastening mechanisms and electric heating cables; the blades are fixed to the upper and lower surfaces of the blade skeletons; the blade skeletons and the idle shafts form a cavity, the electric heating cables are arranged in the cavity and wrapped around the edge of the butterfly plate; the idle shaft is a through-hole structure, the electric heating cables are led out of the valve body and connected to the power connection box; the fastening mechanism is composed of a clamping bolt and a pressure plate, the clamping bolts are used to clamp the pressure plate in the blade skeleton through the threaded holes on the blade skeleton, so that the electric heating cables are close to the outside of the butterfly plate The blade skeleton has an oblong hole-shaped cross section, one side is in an arc shape, and the other side is in a "3" shape. The convex part of the arc side can fit tightly with the concave part of the "3" shaped side. The "3" shaped side is wrapped by a sealing sheet. When the valve is closed, the butterfly plate wrapped by the sealing sheet on the "3" shaped side is squeezed and matched by the butterfly plate on the convex part of the arc side to achieve a labyrinth seal. The side sealing valve seat is an arch bridge-shaped spring stainless steel sheet. When the valve is closed, the arc side of the blade skeleton fits tightly with the arch bridge-shaped sealing valve seat to achieve sealing.

7. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 6 is characterized in that: The sealing sheet is made of metal sheet.

8. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 2 is characterized in that: One end of the real rotating shaft is clamped with a butterfly plate by a fastener so as to rotate along with it, and the other end is fixed on the side frame by a fastener through a bearing seat with a bearing.

9. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 6, characterized in that: One end of the idle shaft is clamped with the blade and the blade skeleton by fasteners, and the other end is fixed to the side frame by fasteners through a bearing seat with a bearing.

10. The low leakage and high strength electric heating air valve for nuclear power plants according to claim 6, characterized in that: The blade skeleton is composed of an exoskeleton frame, transverse skeletons and vertical skeletons welded together.

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