Nuclear-grade high-temperature-resistant closed isolating valve

Abstract

The utility model discloses a nuclear-grade high-temperature-resistant closed type isolating valve which comprises a valve body, a valve core, a valve core, a valve core, a valve core, a valve core and a valve core, the opening and closing mechanism comprises a blade, a rotating shaft, a driving rotating rod and an auxiliary rotating rod, the left end and the right end of the rotating shaft are rotationally connected with the valve seat respectively, the two opposite side faces of the blade are a windward face and a leeward face respectively, one end of the driving rotating rod is hinged to the leeward face, and the other end of the driving rotating rod is connected with the rotating shaft. The rotating shaft is located above the connecting point of the auxiliary rotating rod and the valve seat. The driving assembly is mounted on the valve seat and is in driving connection with the rotating shaft; when the blade closes the circulation opening, the leeside is connected with the front wall face of the sealing frame, and the connecting point of the auxiliary rotating rod and the blade is located above the connecting point of the driving rotating rod and the blade. The high-temperature-resistant and fireproof cable has good sealing performance and isolation performance, and can meet the high-temperature-resistant and fireproof requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of isolation valves, in particular to a nuclear-grade high-temperature resistant airtight isolation valve. Background Art

[0002] In certain specific environments, such as at the inlet and outlet of the iodine adsorption device, both fire prevention and isolation valves are required to have the ability to prevent fire and prevent the spread of radioactive substances.

[0003] However, in order to achieve good radioactive material isolation, the isolation valves currently used in existing nuclear power plants have the shafts, rotary rods and other components that control the rotation of the isolation valve blades set on the windward side. When encountering a fire accident, the shafts and rotary rods on the windward side need to withstand the harsh environment of high temperature, impact and other factors, and the probability of abnormalities in the shafts and rotary rods increases, reducing the reliability of isolation and seriously affecting the safety and reliability of the nuclear power plant. In some nuclear power plants, in order to isolate radioactive materials and prevent fire, isolation valves and fire dampers are used in series, and the isolation valves and fire dampers are controlled separately. However, such a setting makes control more difficult and will increase the investment cost of the nuclear power plant. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a nuclear-grade high-temperature resistant airtight isolation valve, which has good sealing and isolation performance and can also meet the requirements of high temperature resistance and fire prevention.

[0005] The solution of the utility model to solve the technical problem is:

[0006] A nuclear-grade high-temperature resistant closed isolation valve, comprising:

[0007] The valve body comprises a valve seat and a sealing frame, wherein the valve seat is provided with a flow opening, and the sealing frame is arranged at the edge of the flow opening and connected to the valve seat;

[0008] The opening and closing mechanism comprises a blade, a rotating shaft, an active rotating rod and an auxiliary rotating rod, wherein the rotating shaft is extended in the left-right direction, the left and right ends of the rotating shaft are respectively connected to the valve seat for rotation, the two opposite side surfaces of the blade are respectively a windward surface and a leeward surface, one end of the active rotating rod is hinged to the leeward surface, the other end of the active rotating rod is connected to the rotating shaft, one end of the auxiliary rotating rod is hinged to the windward surface, the other end of the auxiliary rotating rod is connected to the valve seat for rotation, and the rotating shaft is located above the connection point between the auxiliary rotating rod and the valve seat;

[0009] A drive assembly is installed on the valve seat and is connected to the rotating shaft to drive the rotating shaft to rotate and drive the active rotary rod to drive the blade to open or close the flow port; when the blade closes the flow port, the leeward side is connected to the front wall of the sealing frame, and the connection point between the auxiliary rotary rod and the blade is located above the connection point between the active rotary rod and the blade.

[0010] The utility model has at least the following beneficial effects: the valve body is the installation basis of the entire nuclear-grade high-temperature resistant sealed isolation valve, the opening and closing mechanism is used to open or close the flow port, and the driving component is used to drive the opening and closing mechanism to open or close the flow port. When the flow port is opened, the gas on the front and rear sides of the nuclear-grade high-temperature resistant sealed isolation valve can circulate, and when the flow port is closed, the nuclear-grade high-temperature resistant sealed isolation valve can isolate the space on both sides to avoid leakage of radioactive gas in the nuclear power plant.

[0011] The active rotary rod, blades, auxiliary rotary rod and valve seat together form a four-bar linkage mechanism. When the driving assembly drives the shaft to rotate, the shaft can drive the active rotary rod to rotate. The active rotary rod simultaneously pushes the blades to flip, thereby realizing the opening or closing of the convection port. The auxiliary rotary rod can support the other side of the blade to ensure the stability of the blade flipping process.

[0012] Since the active rotary rod and the rotating shaft are arranged on the leeward side of the blade, in the event of a fire on the windward side, the active rotary rod and the rotating shaft are not affected by the high temperature, and the sealing performance of the nuclear-grade high-temperature resistant closed isolation valve is still maintained, which effectively solves the problem of isolation failure during a fire and achieves a fire prevention effect. There is no need to set up a fire damper for fire prevention, which reduces the valve structure that needs to be controlled, is easy to control, and reduces the investment cost of the fire protection system and ventilation system of the nuclear power plant.

[0013] As a further improvement of the above technical solution, there are multiple flow openings, the edges of each flow opening are respectively provided with the sealing frames, two adjacent sealing frames are connected to each other, and there are multiple opening and closing mechanisms, which are arranged one by one with the sealing frames.

[0014] Such a setting can make the nuclear-grade high-temperature resistant sealed isolation valve form a multi-leaf structure, that is, it has multiple blades, to achieve the rectification effect of the ventilation system and reduce the generation of turbulence in the ventilation system. At the same time, during the opening process of the nuclear-grade high-temperature resistant sealed isolation valve, the moment generated by the blade can be reduced, especially when subjected to seismic loads, effectively improving the rigidity of the nuclear-grade high-temperature resistant sealed isolation valve and reducing the driving force required for the drive component.

[0015] As a further improvement of the above technical solution, the plurality of opening and closing mechanisms are arranged in the up and down directions, the driving assembly includes an actuator, a connecting rod and a swing arm, the connecting rod is extended up and down, and the swing arms are provided with a plurality of swing arms, each of the swing arms corresponds one to one with the rotating shaft of the opening and closing mechanism, one end of the swing arm is connected to the rotating shaft, and the other end is rotatably connected to the connecting rod, the actuator is mounted on the valve body, and the output end of the actuator is connected to one of the rotating shafts.

[0016] With such an arrangement, the same actuator can be used to control the actions of all the opening and closing mechanisms. When the actuator drives one of the rotating shafts to rotate, the swing arm connected to the rotating shaft can rotate, and the swing arm drives the connecting rod to move, which can rotate other swing arms, thereby rotating other rotating shafts, thereby realizing the opening and closing control of all opening and closing mechanisms.

[0017] As a further improvement of the above technical solution, the swing arm is provided with a polygonal hole, and the end of the rotating shaft is provided with a polygonal convex block, and the polygonal convex block is matched and connected with the polygonal hole. The connection between the swing arm and the rotating shaft is realized by the matching of the polygonal convex block and the polygonal hole, and the rotating shaft and the swing arm will not rotate relative to each other, so the installation is convenient and quick.

[0018] As a further improvement of the above technical solution, the valve body further includes a reinforcing plate, which is arranged between two adjacent sealing frames, the upper and lower sides of the reinforcing plate are respectively connected to the sealing frames, the reinforcing plate is extended in the front-to-back direction, and the left and right ends of the reinforcing plate are respectively connected to the valve seat. The provision of the reinforcing plate can increase the overall strength and rigidity of the valve body and extend the service life of the nuclear-grade high-temperature resistant closed isolation valve.

[0019] As a further improvement of the above technical solution, the sealing frame includes a frame body and a sealing strip, the frame body is connected to the valve seat, a groove is provided at the edge of the front wall of the frame body, the sealing strip is connected to the inner wall of the groove and protrudes from the front wall of the frame body, and when the blade closes the flow port, the leeward surface abuts against the sealing strip. The provision of the sealing strip can increase the sealing performance between the sealing frame and the blade, and further reduce the leakage of radioactive gas.

[0020] As a further improvement of the above technical solution, the leeward surface is provided with a sealing edge protruding backwards, and the sealing edge is arranged along the edge of the leeward surface, and when the blade closes the flow opening, the sealing edge is embedded in the sealing strip. When the blade closes the flow opening, the sealing edge can be embedded in the sealing strip, further improving the sealing performance between the blade and the sealing frame, and reducing the leakage of radioactive gas.

[0021] As a further improvement of the above technical solution, the opening and closing mechanism further includes a first hinge seat and a second hinge seat, wherein the first hinge seat is installed at the lower part of the leeward surface, the second hinge seat is installed at the upper part of the windward surface, the active rotary rod is hinged to the first hinge seat, and the auxiliary rotary rod is hinged to the second hinge seat. The connection between the blade and the active rotary rod is realized by the first hinge seat, and the connection between the blade and the auxiliary rotary rod is realized by the second hinge seat, which is more conducive to the processing and manufacturing of the blade while being able to realize the flipping action of the blade.

[0022] As a further improvement of the above technical solution, the active rotary rods are provided in plurality, and the plurality of active rotary rods are arranged along the extension direction of the rotating shaft. Arranging a plurality of active rotary rods to control the turning of the blades can improve the stability of the turning of the blades.

[0023] As a further improvement of the above technical solution, the valve seat includes a left frame, a right frame, an upper frame and a lower frame, the upper end of the left frame and the upper end of the right frame are respectively connected to the left and right ends of the upper frame, the lower end of the left frame and the lower end of the right frame are respectively connected to the left and right ends of the lower frame, and the left frame, the right frame, the upper frame and the lower frame are respectively provided with weight-reducing grooves. Such an arrangement can reduce the plate thickness and weight of each wall surface of the valve seat while ensuring the overall strength and stability of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following is a brief description of the drawings required for the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present utility model, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of a nuclear-grade high-temperature resistant sealed isolation valve (in a closed state) according to an embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of the overall structure of the nuclear-grade high-temperature resistant sealed isolation valve (in a closed state) of an embodiment of the utility model at another angle;

[0027] Figure 3 It is a schematic diagram of the overall structure of a nuclear-grade high-temperature resistant sealed isolation valve (in an open state) according to an embodiment of the utility model;

[0028] Figure 4 It is a schematic diagram of the overall structure of the nuclear-grade high-temperature resistant sealed isolation valve (in an open state) of the embodiment of the utility model at another angle;

[0029] Figure 5This is a front view of a nuclear-grade high-temperature resistant sealed isolation valve according to an embodiment of the utility model;

[0030] Figure 6 It is a rear view of a nuclear-grade high-temperature resistant sealed isolation valve according to an embodiment of the utility model;

[0031] Figure 7 It is a right view of a nuclear-grade high-temperature resistant sealed isolation valve according to an embodiment of the utility model;

[0032] Figure 8 yes Figure 6 Sectional view in the AA direction;

[0033] Fig. 9 yes Figure 8 The structural diagram of the nuclear-grade high-temperature resistant closed isolation valve when the blade and the sealing frame are just separated;

[0034] Fig.10 yes Figure 8 The structural diagram of the nuclear-grade high-temperature resistant closed isolation valve when the blade and the sealing frame are completely separated;

[0035] Fig.11 yes Figure 6 Cross-sectional view in the BB direction;

[0036] Fig.12 yes Fig.11 A partial enlarged schematic diagram of part C in the middle;

[0037] Fig.13 It is a structural schematic diagram of the valve body of a nuclear-grade high-temperature resistant sealed isolation valve according to an embodiment of the utility model;

[0038] Fig.14 It is a schematic structural diagram of the blades of a nuclear-grade high-temperature resistant sealed isolation valve according to an embodiment of the utility model.

[0039] : Reference numerals: 100, valve seat; 110, flow port; 120, reinforcement plate; 130, left frame; 140, right frame; 150, upper frame; 160, lower frame; 200, blade; 210, windward side; 220, leeward side; 230, sealing edge; 240, first hinge seat; 250, second hinge seat; 300, drive assembly; 310, actuator; 320, mounting bracket; 330, connecting rod; 340, swing arm; 341, positioning block; 400, active swing rod; 500, auxiliary swing rod; 510, auxiliary pin; 600, rotating shaft; 610, polygonal protrusion; 620, bearing; 700, sealing frame; 710, sealing strip; 720, frame. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of the present invention, descriptions of orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0044] Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. The various technical features in the utility model can be combined interchangeably without conflicting with each other.

[0045] Reference Figures 1 to 14 The embodiment of the utility model proposes a nuclear-grade high-temperature resistant closed isolation valve, which has more effective and reliable high-temperature resistance, compact overall structure and strong stability, and solves the problems of poor high-temperature resistance and poor use stability of isolation valves used in existing nuclear power plants.

[0046] In this embodiment, the nuclear-grade high-temperature resistant sealed isolation valve includes a valve body, an opening and closing mechanism, and a driving assembly 300. Among them, the valve body is the installation base of the entire nuclear-grade high-temperature resistant sealed isolation valve, which includes a sealing frame 700 and a valve seat 100. A flow port 110 is provided at the valve seat 100, and the sealing frame 700 is provided at the edge of the flow port 110 and connected to the valve seat 100. The opening and closing mechanism is used to open or close the flow port 110, and the driving assembly 300 is used to drive the opening and closing mechanism to open or close the flow port 110. When the flow port 110 is opened, the gas on the front and rear sides of the nuclear-grade high-temperature resistant sealed isolation valve can circulate, and when the flow port 110 is closed, the nuclear-grade high-temperature resistant sealed isolation valve can play the role of isolating the space on both sides to prevent the leakage of radioactive gas in the nuclear power plant.

[0047] In this embodiment, the opening and closing mechanism includes a blade 200, a rotating shaft 600, an active rotary rod 400, and an auxiliary rotary rod 500. Specifically, the rotating shaft 600 extends along the length direction of the valve seat 100, that is, it is extended in the left-right direction, the rotating shaft 600 is installed in the flow port 110, and the left and right ends of the rotating shaft 600 are respectively connected to the valve seat 100. The two opposite sides of the blade 200 are the windward surface 210 and the leeward surface 220, one end of the active rotary rod 400 is hinged to the leeward surface 220, the other end of the active rotary rod 400 is connected to the rotating shaft 600, one end of the auxiliary rotary rod 500 is hinged to the windward surface 210, and the other end of the auxiliary rotary rod 500 is rotatably connected to the valve seat 100.

[0048] It is understandable that the connection point between the auxiliary rotary rod 500 and the blade 200 and the connection point between the active rotary rod 400 and the blade 200 are not at the same height, and the connection point between the auxiliary rotary rod 500 and the valve body and the connection point between the active rotary rod 400 and the rotating shaft 600 are not at the same height. The active rotary rod 400, the blade 200, the auxiliary rotary rod 500 and the valve seat 100 together form a four-bar linkage mechanism. When the active rotary rod 400 rotates around the connection point between the blade 200 and the valve seat 100, the blade 200 can be driven to rotate around the connection point between the blade 200 and the active rotary rod 400, and the conversion between the vertical state and the horizontal state of the blade 200 can be realized.

[0049] The driving assembly 300 is mounted on the valve seat 100 and is drivingly connected to the rotating shaft 600 to drive the rotating shaft 600 to rotate around its central axis and drive the active rotating rod 400 to drive the blade 200 to open or close the flow port 110. When the blade 200 closes the flow port 110, the leeward surface 220 is connected to the front wall of the sealing frame 700.

[0050] It is understandable that, in order to realize the rotation connection between the rotating shaft 600 and the valve seat 100, the two ends of the rotating shaft 600 are respectively penetrated through the left wall and the right wall of the valve seat 100, and extend to the left and right sides of the valve seat 100, respectively, and bearings 620 are provided on the left wall and the right wall of the valve seat 100 to provide support for the rotating shaft 600. Among them, one end of the rotating shaft 600 is connected to the driving assembly 300. An end cover is also provided at the bearing 620, which can prevent the bearing 620 from moving and play a role in sealing and protecting the end of the rotating shaft 600.

[0051] It can be understood that the sealing frame 700 can form a sealing structure on the leeward side 220 to prevent leakage of radioactive gas, and the sealing frame 700 can limit the backward movement of the blade 200. In order to allow the blade 200 to move toward the side of the windward side 210 when opening, and to ensure that the active rotary rod 400 is on the leeward side when the flow port 110 is closed, the rotating shaft 600 is arranged above the connection point between the auxiliary rotary rod 500 and the valve seat 100. When the flow port 110 is closed, the connection point between the auxiliary rotary rod 500 and the blade 200 is located above the connection point between the active rotary rod 400 and the blade 200.

[0052] With such a configuration, when the flow port 110 is closed, a good isolation effect can be achieved to reduce the leakage of radioactive gas. In the event of a fuel assembly accident, a container operation accident or a coolant loss accident, the radioactivity level of the exhaust air can be reduced to an acceptable level. At the same time, it can have a fire prevention function. The active rotary rod 400, the rotating shaft 600 and other components that provide a power source for the blade 200 are located on the side of the leeward surface 220. In the event of a fire on the side of the windward surface 210, the active rotary rod 400 and other components are not affected by the high temperature, and the sealing performance of the nuclear-grade high-temperature resistant closed isolation valve is still maintained, effectively solving the problem of isolation failure during a fire.

[0053] It is understandable that the nuclear-grade high-temperature resistant sealed isolation valve of this embodiment can be used in ventilation systems related to safety and fire protection in nuclear power plants to cut off air flow and prevent fire. It can be arranged at the inlet and outlet of the iodine adsorption device. The drive assembly 300 of the nuclear-grade high-temperature resistant sealed isolation valve can be remotely controlled or manually switched according to the operating conditions on site, and is suitable for ventilation and fire protection systems in nuclear power plants.

[0054] In addition, the four-bar structure formed by the active rotary rod 400, the auxiliary rotary rod 500, the blade 200, and the valve seat 100 allows the blade 200 to perform a forward translational motion when it is opened, that is, when the blade 200 is separated from the sealing frame 700. Fig. 9 , so as to reduce the friction between the blade 200 and the sealing frame 700 and increase the service life of the sealing frame 700.

[0055] In some embodiments, the sealing frame 700 includes a frame body 720 and a sealing strip 710. The frame body 720 is connected to the valve seat 100. A groove is provided on the front wall of the frame body 720. The groove is opened toward the front and is located at the edge of the frame body 720 and arranged along the periphery of the frame body 720. The sealing strip 710 is provided at the groove and connected to the inner wall of the groove. The sealing strip 710 protrudes forward from the front wall of the frame body 720. When the blade 200 closes the flow port 110, the leeward side 220 of the blade 200 abuts against the sealing strip 710, so that the blade 200 seals the flow port 110.

[0056] It can be understood that the provision of the sealing strip 710 can increase the sealing performance between the sealing frame 700 and the blade 200, and further reduce the leakage of radioactive gas.

[0057] Furthermore, the leeward side 220 of the blade 200 is provided with a sealing edge 230, which protrudes backward and is arranged along the edge of the leeward side 220. When the blade 200 closes the flow port 110, the sealing edge 230 can be embedded in the sealing strip 710, thereby further improving the sealing performance between the blade 200 and the sealing frame 700 and reducing the leakage of radioactive gas.

[0058] In this embodiment, the blade 200 is formed by stamping to obtain the structure of the sealing edge 230 , which can improve the rigidity of the blade 200 .

[0059] In some embodiments, the opening and closing mechanism further includes a first hinge seat 240 and a second hinge seat 250. The first hinge seat 240 is connected to the lower part of the leeward surface 220 of the blade 200, and the active rotary rod 400 is hinged to the first hinge seat 240 to achieve the connection between the active rotary rod 400 and the blade 200. The second hinge seat 250 is connected to the upper part of the windward surface 210 of the blade 200, and the auxiliary rotary rod 500 is hinged to the second hinge seat 250 to achieve the connection between the auxiliary rotary rod 500 and the blade 200.

[0060] In this embodiment, the first hinge seat 240 and the second hinge seat 250 are both fixed to the blade 200 by welding. Since the first hinge seat 240 and the second hinge seat 250 are arranged at different heights of the blade 200 and are not arranged on the same side of the blade 200, the blade 200 can be turned over under the driving action of the active rotary rod 400 and drive the auxiliary rotary rod 500 to rotate.

[0061] It is understandable that when the blade 200 closes the flow opening 110, the second hinge seat 250 is close to the rotation shaft 600, and when the blade 200 opens the flow opening 110, the second hinge seat 250 is away from the rotation shaft 600. When the blade 200 is converted from a closed state to an open state, the distance between the first hinge seat 240 and the rotation shaft 600 in the vertical direction gradually decreases.

[0062] It is understandable that in order to maintain the movement balance of the left and right sides of the blade 200, two auxiliary rotary rods 500 are provided, and the two auxiliary rotary rods 500 are respectively connected to the left and right side walls of the valve body through the auxiliary pin 510. Specifically, the auxiliary connecting rod is installed on the auxiliary pin 510 through structures such as copper washers and bolts. The auxiliary pin 510 is fixed to the left and right side walls of the valve body by welding and extends in the left and right directions. In the process of the blade 200 opening and closing the flow port 110, the auxiliary rotary rod 500 can rotate around the central axis of the auxiliary pin 510. Correspondingly, two second hinge seats 250 are provided, and the two second hinge seats 250 are respectively located at the left and right ends of the blade 200, and the two second hinge seats 250 are located at the same height of the blade 200.

[0063] In some embodiments, multiple active rotating rods 400 are provided, such as two, three, etc., and the multiple active rotating rods 400 are arranged along the extension direction of the rotating shaft 600, that is, arranged along the left and right direction. It can be understood that the provision of multiple active rotating rods 400 to control the flipping of the blade 200 can improve the stability of the flipping of the blade 200.

[0064] It is understandable that in order to ensure the force balance of the blade 200, the first hinge seats 240 for mounting the active rotary rod 400 are evenly arranged in the middle of the blade 200 along the left-right direction, and the distance between every two first hinge seats 240 is equal.

[0065] Preferably, two active rotary rods 400 are provided, which can ensure the stability of the blade 200 flipping and reduce the production cost. The two active rotary rods 400 are provided at the position between the two auxiliary rotary rods 500, and correspondingly, two first hinge seats 240 are provided, and the two first hinge seats 240 are provided at the position between the two second hinge seats 250, and the two first hinge seats 240 are located at the same height of the blade 200.

[0066] In some embodiments, a special-shaped hole is provided at one end of the active rotary rod 400 connected to the rotating shaft 600, and the position on the rotating shaft 600 for installing the active rotary rod 400 matches the special-shaped hole on the active rotary rod 400. The rotating shaft 600 is inserted into the special-shaped hole of the rotary rod and locked by a positioning pin. Such a configuration is more conducive to the production and processing of the rotating shaft 600 and the active rotary rod 400, and the installation process is more convenient and quick. When the rotating shaft 600 rotates, under the limiting effect of the special-shaped hole, the active rotary rod 400 can rotate with the rotation of the rotating shaft 600.

[0067] The end of the active rotary rod 400 connected to the first hinge seat 240 is hinged by a pin, a copper washer, a gasket and a split pin. The end of the auxiliary rotary rod 500 connected to the second hinge seat 250 is also hinged by a pin, a copper washer, a gasket and a split pin.

[0068] It is understandable that the auxiliary pin 510 for installing the auxiliary rotary rod 500 is arranged on the front side of the sealing frame 700, that is, the windward side, and the rotating shaft 600 for installing the active rotary rod 400 is arranged on the rear side of the sealing frame 700, that is, the leeward side, and the groove of the frame body 720 in the sealing frame 700 opens toward one side of the auxiliary pin 510. When the blade 200 closes the flow port 110, the rotating shaft 600 tightens the first hinge seat 240 through the active rotary rod 400, so that the blade 200 and the sealing strip 710 on the sealing frame 700 are closely fitted, thereby realizing the sealing of the nuclear-grade high-temperature resistant closed isolation valve.

[0069] In some embodiments, a plurality of flow openings 110 are provided on the valve seat 100, and a sealing frame 700 is provided at the edge of each flow opening 110, and two adjacent sealing frames 700 are connected to each other. A plurality of opening and closing mechanisms are also provided correspondingly, and the opening and closing mechanisms are arranged one by one with the sealing frames 700, that is, one opening and closing mechanism is used to open or close one flow opening 110.

[0070] It is understandable that such a configuration can allow the nuclear-grade high-temperature resistant sealed isolation valve to form a multi-leaf structure, that is, to have multiple blades 200, to achieve a rectification effect of the ventilation system and reduce the generation of turbulence in the ventilation system. At the same time, during the opening process of the nuclear-grade high-temperature resistant sealed isolation valve, the moment generated by the blade 200 can be reduced, especially when subjected to seismic loads, effectively improving the rigidity of the nuclear-grade high-temperature resistant sealed isolation valve and reducing the driving force required by the driving assembly 300.

[0071] It is understandable that multiple opening and closing mechanisms can be independently controlled by multiple drive assemblies 300, but arranging drive assemblies 300 one by one corresponding to the number of opening and closing mechanisms undoubtedly increases production and control costs. Therefore, in some embodiments, using the same drive assembly 300 to control the actions of all opening and closing mechanisms can not only reduce production costs, but also facilitate control of each opening and closing mechanism.

[0072] In this embodiment, the flow ports 110 are arranged in the up-down direction, and correspondingly, the opening and closing mechanisms are also arranged in the up-down direction. The driving assembly 300 includes an actuator 310, a connecting rod 330, and a swing arm 340. The connecting rod 330 is extended in the up-down direction, and a plurality of swing arms 340 are provided. The swing arms 340 are arranged one-to-one with the rotating shaft 600 of the opening and closing mechanism. One end of the swing arm 340 is connected to the rotating shaft 600, and the other end is rotatably connected to the connecting rod 330. The connecting rod 330 and the plurality of swing arms 340 together form a parallelogram-shaped planar connecting rod mechanism. The actuator 310 is mounted on the valve body, and the output end of the actuator 310 is connected to the rotating shaft 600 of one of the opening and closing mechanisms. Under the driving action of the actuator 310, the rotating shaft 600 connected to the actuator 310 rotates, and drives the swing arm 340 connected to the rotating shaft 600 to rotate, so that the connecting rod 330 moves in position, and drives the other swing arms 340 to rotate at the same time, so that the rotating shafts 600 of each opening and closing mechanism rotate at the same time, realizing the simultaneous opening and closing of each blade 200.

[0073] The actuator 310 may be a component such as a motor that can drive the rotating shaft 600 to rotate around its own central axis, and can be turned on and off by remote control or manual control.

[0074] Since each swing arm 340 is connected to the same connecting rod 330, when the connecting rod 330 moves under the action of the actuator 310, the end of each swing arm 340 connected to the connecting rod 330 moves the same distance, thereby driving the rotating shaft 600 in each opening and closing mechanism to rotate the same angle, and the opening angles of the blades 200 in each opening and closing mechanism are consistent.

[0075] In this embodiment, the connecting rod 330 is "L" shaped, which can reduce the thickness of the connecting rod 330 and make the connecting rod 330 lighter. The connecting rod 330 is connected to the swing arm 340 through a pin, a copper washer, a gasket and a split pin, which ensures the stability of the connection.

[0076] In this embodiment, a polygonal hole is provided on the swing arm 340, and a polygonal protrusion 610 is provided at the end of the rotating shaft 600, and the polygonal protrusion 610 is matched and connected with the polygonal hole. The connection between the swing arm 340 and the rotating shaft 600 is achieved by the matching of the polygonal protrusion 610 and the polygonal hole, and the rotating shaft 600 and the swing arm 340 will not rotate relative to each other, so the installation is convenient and quick.

[0077] Furthermore, a positioning block 341 is provided on the swing arm 340, and the positioning block 341 is fixed by welding at one edge position of the polygonal hole of the swing arm 340. It can be understood that the position of the positioning block 341 on each swing arm 340 is the same, and the positioning block 341 can provide a reference basis for the installer of the nuclear-grade high-temperature resistant closed isolation valve, so that each swing arm 340 can be quickly and accurately connected with the corresponding rotating shaft 600.

[0078] Furthermore, in order to improve the connection stability between the swing arm 340 and the rotating shaft 600, a positioning pin is also provided on the swing arm 340, and positioning pin holes are provided on the positioning block 341 and the polygonal protrusion 610. After the polygonal protrusion 610 is passed through the polygonal hole, the positioning pin hole on the polygonal protrusion 610 overlaps with the positioning pin hole on the positioning block 341, and the positioning pin is passed through the positioning pin hole of the positioning block 341 and the positioning pin hole of the polygonal protrusion 610, thereby achieving fixation between the swing arm 340 and the rotating shaft 600.

[0079] In this embodiment, the drive assembly 300 also includes a mounting bracket 320, which is arranged on the outer wall of the valve seat 100, and the mounting bracket 320 and the valve seat 100 are fixed by fasteners. The body of the actuator 310 is fixed to the mounting bracket 320 by fasteners, thereby realizing the installation connection between the actuator 310 and the valve seat 100.

[0080] In some embodiments, the valve body also includes a reinforcing plate 120, which is disposed between two adjacent sealing frames 700, and the upper and lower side surfaces of the reinforcing plate 120 are respectively connected to the sealing frames 700 on the upper and lower sides, and the reinforcing plate 120 is extended along the front-to-back direction, and the left end and the right end of the reinforcing plate 120 are respectively connected to the valve seat 100.

[0081] It is understood that the reinforcing plate 120 can be connected to the valve seat 100 by welding. The provision of the reinforcing plate 120 can increase the overall strength and rigidity of the valve body. It is understood that the reinforcing plate 120 can be provided to protrude forward from the front side of the sealing frame 700, or can protrude from the front and rear sides of the sealing frame 700 at the same time. In order to further improve the strength and rigidity of the valve body, the reinforcing plate 120 can extend forward to a position flush with the front end surface of the valve seat 100, or can extend forward and backward at the same time to a position flush with the front and rear end surfaces of the valve seat 100.

[0082] In some embodiments, the valve seat 100 includes a left frame 130, a right frame 140, an upper frame 150 and a lower frame 160, the upper end of the left frame 130 and the upper end of the right frame 140 are respectively connected to the left and right ends of the upper frame 150, and the lower end of the left frame 130 and the lower end of the right frame 140 are respectively connected to the left and right ends of the lower frame 160.

[0083] Specifically, the connections among the left frame 130 , the right frame 140 , the upper frame 150 and the lower frame 160 are all achieved by welding.

[0084] Among them, the left and right ends of the rotating shaft 600 are respectively penetrated through the left frame 130 and the right frame 140, and the bearing 620 is installed at the left frame 130 and the right frame 140. The left and right ends of the reinforcing plate 120 are respectively welded to the left frame 130 and the right frame 140. The auxiliary pin 510 is also connected to the left frame 130 or the right frame 140 by welding. It can be understood that the left frame 130 and the right frame 140 are used as the supporting bodies of the rotating shaft 600, the auxiliary pin 510 and other structures, and positioning holes are set at corresponding positions to facilitate installation by the installer. For example, positioning holes for installing the auxiliary pin 510 are set in both the left frame 130 and the right frame 140. The auxiliary pin 510 has a large diameter end and a small diameter end. The large diameter end of the auxiliary pin 510 is fixed at the positioning hole by welding, and the small diameter end is connected to the auxiliary rotating rod 500. Such an arrangement can effectively implement measures to reinforce the opening, thereby achieving the goal of not reducing the overall strength of the valve seat 100 at the same weight.

[0085] In some embodiments, in order to reduce the weight of the entire valve seat 100, the left frame 130, the right frame 140, the upper frame 150 and the lower frame 160 are respectively provided with weight-reducing grooves. In some embodiments, the weight-reducing grooves are in the shape of "[__]". In this way, the thickness and weight of each wall surface of the valve seat 100 can be reduced while ensuring the overall strength and stability of the valve seat 100.

[0086] In this embodiment, the left frame 130, the right frame 140, the upper frame 150 and the lower frame 160 all include a mounting plate, two extension plates and two support plates. The two extension plates are respectively located at the two ends of the mounting plate along the width direction and are arranged perpendicular to the mounting plate. The two support plates are respectively connected to the two extension plates. The two support plates are arranged opposite to each other and there is a distance between the ends of the two support plates. The mounting plate, the two extension plates and the two support plates together surround and form a "[__]"-shaped weight-reducing groove.

[0087] It is understandable that the mounting plate provides a mounting position for other components, for example, the bearing 620 is mounted on the mounting plates of the left frame 130 and the right frame 140. The provision of the support plate can increase the contact area between the valve seat 100 and the mounting position, making the installation of the nuclear-grade high-temperature resistant sealed isolation valve more stable.

[0088] It is understandable that the opening of the weight-reducing groove is set toward the outside, specifically, the opening of the weight-reducing groove of the left frame 130 is toward the left, the opening of the weight-reducing groove of the right frame 140 is toward the right, the opening of the weight-reducing groove of the upper frame 150 is toward the top, and the opening of the weight-reducing groove of the lower frame 160 is toward the bottom. The left frame 130, the right frame 140, the upper frame 150 and the lower frame 160 can be formed by a process such as stamping.

[0089] The preferred implementation modes of the present invention are specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A nuclear-grade high-temperature resistant sealed isolation valve, characterized in that: include: The valve body comprises a valve seat and a sealing frame, wherein the valve seat is provided with a flow opening, and the sealing frame is arranged at the edge of the flow opening and connected to the valve seat; The opening and closing mechanism comprises a blade, a rotating shaft, an active rotating rod and an auxiliary rotating rod, wherein the rotating shaft is extended in the left-right direction, the left and right ends of the rotating shaft are respectively connected to the valve seat for rotation, the two opposite side surfaces of the blade are respectively a windward surface and a leeward surface, one end of the active rotating rod is hinged to the leeward surface, the other end of the active rotating rod is connected to the rotating shaft, one end of the auxiliary rotating rod is hinged to the windward surface, the other end of the auxiliary rotating rod is connected to the valve seat for rotation, and the rotating shaft is located above the connection point between the auxiliary rotating rod and the valve seat; A drive assembly is installed on the valve seat and is connected to the rotating shaft to drive the rotating shaft to rotate and drive the active rotary rod to drive the blade to open or close the flow port; when the blade closes the flow port, the leeward side is connected to the front wall of the sealing frame, and the connection point between the auxiliary rotary rod and the blade is located above the connection point between the active rotary rod and the blade.

2. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 1 is characterized in that: There are multiple flow openings, and the edges of each flow opening are respectively provided with the sealing frames, and two adjacent sealing frames are connected to each other. There are multiple opening and closing mechanisms, and the opening and closing mechanisms are arranged in one-to-one correspondence with the sealing frames.

3. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 2 is characterized in that: The multiple opening and closing mechanisms are arranged in the up and down directions, and the driving assembly includes an actuator, a connecting rod and a swing arm. The connecting rod is extended up and down, and there are multiple swing arms. The swing arms correspond one by one to the rotating shafts of the opening and closing mechanisms. One end of the swing arm is connected to the rotating shaft, and the other end is rotatably connected to the connecting rod. The actuator is installed on the valve body, and the output end of the actuator is connected to one of the rotating shafts.

4. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 3 is characterized in that: The rotary arm is provided with a polygonal hole, and the end of the rotating shaft is provided with a polygonal convex block, and the polygonal convex block is matched and connected with the polygonal hole.

5. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 2 is characterized in that: The valve body also includes a reinforcing plate, which is arranged between two adjacent sealing frames, and the upper and lower side surfaces of the reinforcing plate are respectively connected to the sealing frames. The reinforcing plate extends along the front-to-back direction, and the left and right ends of the reinforcing plate are respectively connected to the valve seat.

6. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 1 is characterized in that: The sealing frame includes a frame body and a sealing strip, the frame body is connected to the valve seat, a groove is provided at the edge of the front wall of the frame body, the sealing strip is connected to the inner wall of the groove and protrudes from the front wall of the frame body, and when the blade closes the flow port, the leeward side abuts against the sealing strip.

7. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 6 is characterized in that: The leeward surface is provided with a sealing edge protruding backwards, and the sealing edge is arranged along the edge of the leeward surface. When the blade closes the flow opening, the sealing edge is embedded in the sealing strip.

8. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 1 is characterized in that: The opening and closing mechanism also includes a first hinge seat and a second hinge seat, the first hinge seat is installed at the lower part of the leeward surface, the second hinge seat is installed at the upper part of the windward surface, the active rotary rod is hinged to the first hinge seat, and the auxiliary rotary rod is hinged to the second hinge seat.

9. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 1, characterized in that: There are a plurality of active rotating rods, and the plurality of active rotating rods are arranged along the extending direction of the rotating shaft.

10. The nuclear-grade high-temperature resistant sealed isolation valve according to claim 1, characterized in that: The valve seat includes a left frame, a right frame, an upper frame and a lower frame. The upper end of the left frame and the upper end of the right frame are respectively connected to the left and right ends of the upper frame, the lower end of the left frame and the lower end of the right frame are respectively connected to the left and right ends of the lower frame, and the left frame, the right frame, the upper frame and the lower frame are respectively provided with weight reduction grooves.

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