Nuclear-grade low-leakage fireproof valve

Abstract

The utility model discloses a nuclear-grade low-leakage fireproof valve which comprises a valve body, a connecting rod mechanism, a driving mechanism, blades and a rotating shaft. The valve body comprises valve seats, a left inner frame, a left outer frame, a right inner frame, a right outer frame, an upper frame and a lower frame, the left inner frame, the right inner frame, the upper frame and the lower frame are welded and assembled into a frame structure, and the valve seats are arranged on the inner walls of the upper frame and the lower frame respectively; the rotating shafts are in transmission connection through the connecting rod mechanism, the left outer frame is detachably installed on the left side of the frame structure, the right outer frame is detachably installed on the right side of the frame structure, and closed containing cavities are formed between the left outer frame and the frame structure and between the right outer frame and the frame structure respectively. The problems that an existing installation mode of the connecting rod mechanism of the fireproof valve cannot completely meet the requirement of a high-safety-requirement environment, and normal operation of the fireproof valve is affected are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fire damper structure technical field, especially a nuclear grade low leakage's fire damper. BACKGROUND

[0002] According to "nuclear power plant ventilation and smoke exhaust system fire damper", fire damper is installed on the air supply and return duct of ventilation and air conditioning system or fire boundary, and is in open state usually, and is closed when the temperature of flue gas in the duct or on the fire boundary reaches the set temperature, or is closed by the fire control system.

[0003] At present, the installation mode of the connecting rod mechanism of the fire damper mainly has two kinds: external type and internal type, the external type connecting rod mechanism is installed outside the valve frame of the fire damper, and the internal type connecting rod mechanism is installed inside the valve frame of the fire damper, and is usually integrated with the valve blade or the actuator. However, in the environment involving radioactive medium transportation such as nuclear power station, the sealing performance of the fire damper is crucial, the external type connecting rod mechanism can cause the valve frame to increase a plurality of exposed rotating shafts, thereby increasing the risk of external leakage, which cannot ensure the safe isolation of the radioactive medium, cannot prevent environmental pollution, and after secondary pouring in the wall, the external type connecting rod mechanism cannot act, which is not conducive to the installation of the wall, and the internal type connecting rod mechanism of the fire damper is easy to be jammed by foreign matters, especially when the fire occurs, if the temperature does not reach the set value, the foreign matters at the fire can be jammed to the connecting rod mechanism through the ventilation duct when the fire damper is not closed, which can cause the fire damper to fail to close when the set temperature is reached, and moreover, if the connecting rod mechanism is arranged on the combustion surface, any part of the connecting rod mechanism can be burned or deformed, which can cause the valve to be unable to be sealed, in order to ensure the sealing performance of the fire damper, the connecting rod mechanism is usually arranged on the backfire surface, but in this way, the standard requirement of "nuclear power plant ventilation and smoke exhaust system fire damper" that "both the positive and negative air flow directions of the valve are subjected to fire resistance test" is violated. That is, the installation mode of the two kinds of connecting rod mechanisms cannot completely meet the demand of the high safety requirement environment such as nuclear power station.

[0004] Therefore, a cover is usually added outside the external type connecting rod mechanism to seal the connecting rod mechanism, but in order not to leak externally, full welding or bolt fixation is required, which is large in workload and easy to deform, thereby affecting the normal operation of the fire damper. UTILITY MODEL CONTENTS

[0005] In view of the above defects, the purpose of the utility model is to provide a nuclear grade low leakage fire damper, which solves the problem that the installation mode of the connecting rod mechanism of the current fire damper cannot completely meet the demand of the high safety requirement environment and affects the normal operation of the fire damper.

[0006] To achieve the purpose, the utility model adopts the following technical scheme:

[0007] A nuclear grade low-leakage fire damper valve, comprising a valve body, a connecting rod mechanism, a driving mechanism, a blade and a rotating shaft;

[0008] The valve body comprises a valve seat, a left inner frame, a left outer frame, a right inner frame, a right outer frame, an upper edge frame and a lower edge frame, wherein the left inner frame, the right inner frame, the upper edge frame and the lower edge frame are welded to form a frame structure, and the inner walls of the upper edge frame and the lower edge frame are respectively provided with the valve seat;

[0009] A plurality of blades are rotatably mounted on the frame structure through the rotating shaft, the number of the blades is equal to that of the rotating shafts, the rotating shafts are connected through the connecting rod mechanism, the driving end of the driving mechanism is connected with any rotating shaft, the driving mechanism is used for driving the rotating shaft to rotate, and the rotation of the rotating shaft drives the rotation of the plurality of blades through the connecting rod mechanism.

[0010] The left outer frame is detachably mounted on the left side of the frame structure, the right outer frame is detachably mounted on the right side of the frame structure, and the left outer frame and the right outer frame are respectively provided with airtight accommodating cavities formed between the frame structure and the left outer frame / the right outer frame, and the accommodating cavities are used for accommodating the connecting rod mechanism.

[0011] Preferably, the left outer frame and the right outer frame each comprise an outer frame plate and a sealing plate, the cross-sectional shape of the outer frame plate is “arch” shape, and the sealing plate is welded at both ends of the outer frame plate.

[0012] The cross-sectional shape of the sealing plate is “L” shape, the opening direction of the sealing plate faces the upper edge frame / lower edge frame, one side of the sealing plate is located between the outer frame plate and the upper edge frame / lower edge frame, and the other side is welded to the end of the upper edge frame / lower edge frame.

[0013] Further, the cross-sectional shape of the upper edge frame, the lower edge frame, the left inner frame and the right inner frame is “[” shape and the opening direction faces outward, the middle part of the short side of the left inner frame and the right inner frame is provided with a protruding part, the left inner frame and the right inner frame are respectively clamped into the middle groove of the left outer frame and the right outer frame, and the connecting rod mechanism is sealed in the accommodating cavities formed by the left outer frame and the left inner frame and the right outer frame and the right inner frame.

[0014] Further, the thickness of the left inner frame and the right inner frame is smaller than that of the outer frame plate, and the protruding part is an outwardly arched circular arc.

[0015] The width of the left inner frame or the right inner frame plus the total width W1 of the outwardly arched circular arc in the middle part of the short side is greater than the width W2 of the middle groove of the left outer frame or the right outer frame, and the difference between W1 and W2 is 0.2-0.3 mm.

[0016] Preferably, the left inner frame and the right inner frame are respectively provided with corresponding shaft holes, and corresponding two shaft holes are respectively provided with the rotating shaft;

[0017] The number of the connecting rod mechanisms is two, and the two connecting rod mechanisms are respectively located in the left inner frame and the right inner frame.

[0018] The shaft hole is in the shape of a nozzle, and the radius of the shaft hole increases from outside to inside.

[0019] The rotating arm is clamped on both ends of the rotating shaft and located outside the shaft hole.

[0020] Preferably, the rotating shaft is one of a regular quadrangular prism, a regular hexagonal prism and a regular octagonal prism.

[0021] The two blade plates are connected in a central symmetry, the blade plates are in the shape of wings, the two ends of the blade plates are provided with limiting blocks, one blade is provided with four limiting blocks, the limiting blocks are cuboids provided with grooves matched with the shape of the rotating shaft, and the two blade plates together form a limiting hole matched with the shape of the rotating shaft.

[0022] Preferably, the rotating shaft is one of a regular quadrangular prism, a regular hexagonal prism and a regular octagonal prism.

[0023] The two blade plates are connected in a central symmetry, the blade plates are in the shape of wings, the blade plates are welded with limiting blocks, one blade is provided with two limiting blocks, the limiting blocks are in the shape of "[", the limiting blocks have the same length as the blade plates, the two short edges of the limiting blocks are provided with limiting grooves matched with the shape of the rotating shaft, and the two blade plates together form a limiting hole matched with the shape of the rotating shaft.

[0024] Preferably, the upper edge or the lower edge of the blade is provided with a blade sealing element, the edge of the blade provided with the blade sealing element is overlapped with the edge of the adjacent blade without the blade sealing element, the blade sealing element is provided with a deformation part, and the deformation part is located at the abutting position of the adjacent blades.

[0025] Preferably, each of the left inner frame and the right inner frame is provided with a valve body sealing piece, the valve body sealing piece is arched, the middle part of the valve body sealing piece is provided with a plurality of round holes, the round holes of the valve body sealing piece correspond to the rotating shafts, and the rotating shafts can pass through the round holes of the valve body sealing piece.

[0026] Further, the connecting rod mechanism further comprises a plurality of washers and a plurality of pin shafts, the number of the pin shafts is equal to the number of the rotating arms, and the number of the washers is twice the number of the pin shafts.

[0027] One end of the rotating arm is a fixed hole matched with the shape of the rotating shaft, the rotating shaft passes through the fixed hole of the rotating arm and is connected with the rotating arm, and the other end of the rotating arm is a round hole, the round hole of the rotating arm corresponds to the through hole of the long connecting rod in one-to-one mode, and the pin shaft passes through the round hole of the rotating arm and is connected with the through hole of the long connecting rod.

[0028] The technical scheme provided by the utility model can have the following beneficial effects:

[0029] The connecting rod mechanism is arranged between the left and right inner frames and the left and right outer frames, the left and right inner frames and the left and right outer frames form a sealed space, the connecting rod mechanism is sealed, external leakage is reduced, the left and right inner frames are provided with protruding parts, the protruding parts are matched with the middle recesses of the left and right outer frames in an interference fit, internal leakage is reduced, low leakage of the fire damper is ensured, meanwhile, the left and right outer frames are provided with sealing plates, fluid is prevented from flowing out from the frame gap of the fire damper, the height of the fire damper is adapted, the sealing performance of the fire damper is ensured, and the purpose of low leakage is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of an embodiment of the utility model.

[0031] Figure 2 is a structural schematic view of an embodiment of the utility model when the blade is opened.

[0032] Figure 3 is an exploded structural schematic view of an embodiment of the utility model.

[0033] Figure 4 is a structural schematic view of a valve body of the utility model.

[0034] Figure 5 is a front view of an embodiment of the utility model.

[0035] Figure 6 is Figure 5 A-A sectional view of.

[0036] Figure 7 is a structural schematic view of a blade sealing piece of the utility model.

[0037] Figure 8 is Figure 5 a B-B cross-sectional view of the valve.

[0038] Figure 9 is Figure 8 an enlarged view of Q in the valve.

[0039] Figure 10 is a top view structural schematic view of the left outer frame and the left inner frame of the utility model.

[0040] Figure 11 is a contrastive schematic view of the left outer frame and the left inner frame of the utility model.

[0041] Figure 12 is another contrastive schematic view of the left outer frame and the left inner frame of the utility model.

[0042] Figure 13 is a structural schematic view of the connecting rod mechanism of the utility model.

[0043] Wherein: valve body 1, left inner frame 111, left outer frame 112, right inner frame 121, right outer frame 122, upper edge frame 13, lower edge frame 14, valve seat 15, shaft hole 16, protruding part 17, outer frame plate 18, sealing plate 19, connecting rod mechanism 2, long connecting rod 21, rotary arm 22, gasket 23, pin shaft 24, driving mechanism 3, blade 4, blade plate 41, limiting block 42, blade sealing element 43, deformation part 431, rotating shaft 5, outer shaft sleeve 51, inner shaft sleeve 52, valve body sealing element 6. DETAILED DESCRIPTION

[0044] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0045] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as the limitation of the utility model. In addition, the features limited as "first", "second" can explicitly or implicitly include one or more features, used to distinguish the described features, without order, without light and heavy.

[0046] In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0047] In the description of the utility model, it is necessary to explain that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, and can be detachable connection, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication between two elements.

[0048] The utility model provides a kind of nuclear grade low-leakage fire damper, including valve body 1, connecting rod mechanism 2, drive mechanism 3, blade 4 and shaft 5;

[0049] The valve body 1 includes valve seat 15, left inner frame 111, left outer frame 112, right inner frame 121, right outer frame 122, upper frame 13 and lower frame 14, wherein the left inner frame 111, the right inner frame 121, the upper frame 13 and the lower frame 14 are welded and assembled into a frame structure, and the inner walls of the upper frame 13 and the lower frame 14 are respectively provided with the valve seat 15.

[0050] A plurality of blades 4 are rotatably mounted on the frame structure by the shaft 5, the number of the blade 4 and the shaft 5 is equal, a plurality of shafts 5 are drivingly connected by the connecting rod mechanism 2, the driving end of the drive mechanism 3 is connected with any shaft 5, the drive mechanism 3 is used for driving the shaft 5 to rotate, and the rotation of the shaft 5 drives the rotation of a plurality of blades 4 through the connecting rod mechanism 2.

[0051] The left outer frame 112 is detachably mounted on the left side of the frame structure, the right outer frame 122 is detachably mounted on the right side of the frame structure, and the left outer frame 112 and the right outer frame 122 are respectively formed with airtight accommodating cavities between the frame structure, and the accommodating cavities are used for accommodating the connecting rod mechanism 2.

[0052] The utility model discloses a fire damper, left inner frame 111, right inner frame 121, upper border 13 and lower border 14 weld and assemble into frame body structure, left outer frame 112 detachably install in the left side of frame body structure, right outer frame 122 detachably install in the right side of frame body structure, left outer frame 112 with right outer frame 122 form the sealed accommodating cavity between respectively with frame body structure, the accommodating cavity is used for accommodating connecting rod mechanism 2. When the fire breaks out, even if the temperature does not reach the set value, when the fire damper is not closed, the foreign matter at the fire place will follow the ventilation duct to the fire damper, and the connecting rod mechanism 2 will not be blocked, so that the fire damper can be smoothly closed according to the requirement when the set temperature is reached, and the situation that the fire damper cannot be normally closed due to the blocking of the foreign matter will not occur. Meanwhile, compared with the external connecting rod mechanism 2, the utility model seals the connecting rod mechanism 2 in the left frame and the right frame, and is provided with the left outer frame 112 and the right outer frame 122, which form a sealed space with the left inner frame 111 and the right inner frame 121 respectively, so that the leakage of the connecting rod mechanism 2 is further reduced.

[0053] Furthermore, the left inner frame 111, the right inner frame 121, the upper border 13 and the lower border 14 are welded and assembled into a frame body structure, the left outer frame 112 is detachably installed on the left side of the frame body structure, the right outer frame 122 is detachably installed on the right side of the frame body structure, and the left outer frame 112 and the right outer frame 122 enable the fire damper to normally operate after secondary pouring in the wall body.

[0054] In addition, the valve seat 15 is provided with two, and the two valve seats 15 are arranged on the inner walls of the upper border 13 and the lower border 14 and are connected with the blades 4, so that gaps are prevented between the blades 4 and the upper border 13 or the lower border 14, and the sealing performance of the fire damper is further improved.

[0055] Preferably, the left outer frame 112 and the right outer frame 122 each include an outer frame plate 18 and a sealing plate 19, the cross-sectional shape of the outer frame plate 18 is "arch" shape, and the sealing plate 19 is welded at both ends of the outer frame plate 18.

[0056] The cross-sectional shape of the sealing plate 19 is "L" shape, the opening direction of the sealing plate 19 is towards the upper border 13 / lower border 14, one side of the sealing plate 19 is located between the outer frame plate 18 and the upper border 13 / lower border 14, and the other side is welded at the end of the upper border 13 / lower border 14.

[0057] Specifically, as Figure 3As shown, the left outer frame 112 or the right outer frame 122 respectively comprises an outer frame plate 18 and two end sealing plates 19, the cross-sectional shape of the outer frame plate 18 is "arch" shape, the arch-shaped cross-section can better disperse stress when under stress, reduce stress concentration phenomenon, thereby improving the overall strength, making it several times of the ordinary shape, the arc structure of the arch-shaped cross-section is similar to the arch structure, which has good mechanical properties, when under stress, the arch-shaped cross-section can disperse external force to the whole structure instead of concentrating on a certain point, thereby improving the stability and anti-deformation ability of the structure. And while maintaining the structural strength, the thickness of the plate can be reduced, achieving the lightweight of the fire damper structure, the fire damper becomes more portable without sacrificing strength, while maintaining the required structural stability and durability.

[0058] Furthermore, the sealing plate 19 is welded to the two ends of the outer frame plate 18, similar to the ship structure, when installing, the left inner frame 111 and the right inner frame 121 have limited the height of the valve frame, the left outer frame 112 and the right outer frame 122 need to be buckled, but there is a manufacturing error, there is a gap between the left outer frame 112 and the left inner frame 111, the right outer frame 122 and the right inner frame 121, if there is no sealing plate 19, only the outer frame plate 18, under the condition of sealing of the fire damper, fluid will flow out from the four corners of the valve frame, that is, there is a gap between the upper edge frame 13 or the lower edge frame 14 and the left edge frame or the right edge frame, which cannot guarantee the sealing. The cross-sectional shape of the sealing plate 19 is "L" shape, the opening direction of the sealing plate 19 corresponds to the upper edge frame 13 / lower edge frame 14, one side of the sealing plate 19 is located between the outer frame plate 18 and the upper edge frame 13 / lower edge frame 14, and the other side is welded to the end of the upper edge frame 13 / lower edge frame 14. Because the sealing plate 19 is welded to the end of the upper edge frame 13 or the lower edge frame 14, gas cannot leak from the gap, that is, it effectively blocks the leakage.

[0059] Further, the upper edge frame 13, the lower edge frame 14, the left inner frame 111 and the right inner frame 121 have a "[ ]" shape cross-section and the opening direction is outward, the left inner frame 111 and the right inner frame 121 have a protruding part 17 in the middle of the short side, the left inner frame 111 and the right inner frame 121 are respectively clamped into the middle groove of the left outer frame 112 and the right outer frame 122, and the connecting rod mechanism 2 is sealed in the accommodating cavities formed by the left outer frame 112 and the left inner frame 111 and the right outer frame 122 and the right inner frame 121.

[0060] To solve the leakage problem of the external connecting rod structure, a certain cover body is arranged outside the external connecting rod structure to seal the connecting rod mechanism 2, which is equivalent to the left outer frame 112 and the right outer frame 122, but as Figure 11As shown, generally, full welding is used for connection, so as to seal the connecting rod mechanism 2 and reduce external leakage, but the welding work is large and the deformation is large, which will deform the left outer frame 112 and the right outer frame 122, and then affect the rotation of the rotating shaft 5, and finally cause the blade 4 to close and seal not tightly and fail. If not welded, as shown, Figure 12 As shown, generally, bolt connection is used, and the installation mode of the bolt needs to be considered, and a countersunk screw is used to open a hole in the left outer frame 112 and the right outer frame 122, but the structure cannot be reinforced after punching, the rigidity of the left outer frame 112 and the right outer frame 122 is reduced, or welding and bolt are used together, but the welding work is large and the bolt is worn out after being disassembled for many times and cannot be replaced, and the service life is limited.

[0061] Therefore, in the utility model, the left frame of the valve frame includes a left inner frame 111 and a left outer frame 112, the right frame of the valve frame includes a right inner frame 121 and a right outer frame 122, the cross-sectional shape of the left inner frame 111 and the right inner frame 121 is a “[” shape and the opening direction is outward, the cross-sectional shape of the left outer frame 112 and the right outer frame 122 is a “bow” shape, the middle part of the short side of the left inner frame 111 and the right inner frame 121 is provided with a protruding part 17, the left inner frame 111 and the right inner frame 121 are respectively clamped into the middle recess of the left outer frame 112 and the right outer frame 122, the connecting rod mechanism 2 is sealed in the left outer frame 112 and the left inner frame 111, the right outer frame 122 and the right inner frame 121, and the protruding part 17 of the left frame and the right frame and the middle recess of the left outer frame 112 and the right outer frame 122 form an interference fit, as shown, Figure 9 As shown, the precise fitting mode not only ensures that the fire damper can more effectively block the leakage of the gas in the pipeline when closed, but also enhances the sealing performance of the overall structure, and the efficiency of the fire damper in preventing gas leakage is significantly improved, so that the safety performance is ensured, and the reliability and practicability of the product are improved. The problems of large work load, limited service life and influence on normal operation of the fire damper are solved when the closed connecting rod mechanism 2 is used.

[0062] Further, the thickness of the left inner frame 111 and the right inner frame 121 is less than the thickness of the outer frame plate 18, and the protruding part 17 is an outward arching circular arc;

[0063] The width of the left inner frame 111 or the right inner frame 121 plus the total width W1 of the outward arching circular arc of the middle part of the short side is greater than the width W2 of the middle recess of the left outer frame 112 or the right outer frame 122, and the difference between W1 and W2 is 0.2-0.3mm.

[0064] Specifically, the thickness of the left inner frame 111 and the right inner frame 121 is smaller than the plate thickness of the outer frame plate 18, which can quickly buckle the left inner frame 111 and the left outer frame 112, the right inner frame 121 and the right outer frame 122, facilitate the realization of interference fit, and effectively prevent the loosening and relative displacement between the left inner frame 111 and the left outer frame 112, the right inner frame 121 and the right outer frame 122, improve the stability and reliability of the overall structure.

[0065] And, as Figure 10 The difference between the width W1 and the width W2 is 0.2-0.3mm, which is controlled within this difference range to ensure that the contact between the left outer frame 112 and the left inner frame 111, the right outer frame 122 and the right inner frame 121 is more closely, the gap is smaller, further reducing the internal leakage, the valve frame is more stable when bearing external load, reducing the risk of structural failure caused by loose parts or excessive gap. At the same time, by controlling the width difference, the dimensional accuracy after assembly is ensured, further improving the reliability and consistency of the structure.

[0066] Preferably, the left inner frame 111 and the right inner frame 121 are respectively provided with a plurality of corresponding shaft holes 16, and the corresponding two shaft holes 16 are respectively provided with the shaft 5;

[0067] The number of the connecting rod mechanism 2 is two, and the two connecting rod mechanisms 2 are respectively located in the left inner frame 111 and the right inner frame 121. The connecting rod mechanism 2 includes a long connecting rod 21 and a plurality of rotating arms 22. The rotating arm 22 corresponds to the shaft hole 16 one by one. The shaft 5 passes through the shaft hole 16 and then passes through the rotating arm 22. A plurality of rotating arms 22 are arranged on the long connecting rod 21.

[0068] The shaft hole 16 is in the shape of a nozzle, and the radius of the shaft hole 16 increases from outside to inside. The shaft 5 is provided with an outer shaft sleeve 51 and an inner shaft sleeve 52 at both ends. The outer shaft sleeve 51 is rotatably arranged in the shaft hole 16, and the outer shaft sleeve 51 is matched with the shape of the shaft hole 16. The inner shaft sleeve 52 is rotatably arranged in the outer shaft sleeve 51, and the inner shaft sleeve 52 is matched with the shape of the shaft 5.

[0069] The rotating arm 22 is clamped on both ends of the shaft 5 and located outside the shaft hole 16.

[0070] It is worth noting that the left inner frame 111 and the right inner frame 121 are each provided with a corresponding number of shaft holes 16, and the number of shaft holes 16 corresponds one-to-one with the number of rotating shafts 5; the linkage mechanism 2 includes a long connecting rod 21 and a number of rotating arms 22, and the number of rotating arms 22 corresponds one-to-one with the number of shaft holes 16; the number of blades 4 is equal to the number of rotating shafts 5; the drive mechanism 3 is connected to the linkage mechanism 2 and is used to control the linkage mechanism 2 to drive the blades 4 to close. The drive mechanism 3 will drive the long connecting rod 21 of the linkage mechanism 2 to move, thereby driving the rotating arms 22, thus causing the rotating shafts 5 to rotate, driving the blades 4 to rotate, thereby realizing the closing and opening of the fire damper.

[0071] Specifically, the rotating arm 22 is engaged at both ends of the rotating shaft 5, and the long connecting rod 21 is connected to the rotating arm 22. One end of the rotating arm 22 is a round hole, and the long connecting rod 21 has a round hole corresponding to the rotating arm 22. The rotating arm 22 and the round hole of the long connecting rod 21 are constrained to slide by a pin 24. Under the drive of the driving mechanism 3, the rotating shaft 5 connected to the driving mechanism 3 rotates, which drives the rotating arm 22 connected to the rotating shaft 5, and then drives the long connecting rod 21 to move. The sliding of the long connecting rod 21 drives all the rotating arms 22 connected to it to rotate together. All the rotating shafts 5 have the same rotation angle, thereby controlling the rotation of the blade 4 and changing the state of the fire damper.

[0072] In this design, both the outer bushing 51 and the inner bushing 52 can rotate, while only the valve frame is fixed. This greatly reduces resistance and significantly reduces the torque required by the fire damper during operation, thereby reducing energy consumption and operating costs. It also prevents the deformation of the valve frame from affecting the rotation of the rotating shaft 5, thus improving efficiency.

[0073] In addition, such as Figure 4 As shown, the shaft hole 16 is nozzle-shaped. The nozzle-shaped shaft hole 16, through its special geometric structure, can disperse stress to a larger area, thereby reducing local stress peaks and achieving a reinforcement effect at the opening, ensuring that the strength requirements of the structure are met. At the same time, the nozzle shape of the shaft hole 16 is adapted to the shape of the outer bushing 51, which is conducive to the smooth rotation of the outer bushing 51. The nozzle-shaped shaft hole 16 can enhance the structural stability of the left inner frame 111 and the right inner frame 121, and also ensure the flexibility and precision of the outer bushing 51 in operation.

[0074] Preferably, the shaft hole 16 is formed by precision stamping, which can effectively ensure the dimensional and shape accuracy of the shaft hole 16, reduce processing defects, avoid stress concentration caused by inaccurate processing, and thus improve the overall strength of the structure.

[0075] Preferably, the rotating shaft 5 is one of a regular square prism, a regular hexagonal prism, and a regular octagonal prism;

[0076] The blade 4 is connected by two identical blade plates 41 which are centrally symmetrical, the blade plates 41 are airfoil-shaped, and the two ends of the blade plates 41 are provided with limiting blocks 42, one blade 4 is provided with four limiting blocks 42, the limiting blocks 42 are cuboids provided with grooves suitable for the shape of the rotating shaft 5, and two blade plates 41 together form a limiting hole with the same shape as the rotating shaft 5.

[0077] It is worth noting that the rotating shaft 5 penetrates the entire blade 4, that is, the length of the rotating shaft 5 is greater than the blade 4, and the rotating shaft 5 is one of a regular quadrangular prism, a regular hexagonal prism and a regular octagonal prism, so that the limiting block 42 can limit the rotating shaft 5 together with the blade plate 41, and when the rotating shaft 5 rotates, a certain pressure is applied to the limiting block 42 and the blade plate 41, driving the blade 4 to rotate, and selecting one of the regular quadrangular prism, the regular hexagonal prism and the regular octagonal prism ensures that the rotating shaft 5 can drive the blade 4 to rotate, and the regular prism has uniform stress and higher transmission efficiency.

[0078] In addition, the two ends of the blade plate 41 are provided with limiting blocks 42, the limiting blocks 42 are cuboids provided with grooves suitable for the shape of the rotating shaft 5, when two identical blade plates 41 are connected centrally symmetrically, the grooves of the limiting blocks 42 and the blade plates 41 together fix the rotating shaft 5, the limiting blocks 42 adopt a cuboid structure, which is easy to process and manufacture, and the shape of the grooves of the limiting blocks 42 can be accurately matched with the rotating shaft 5, ensuring the coaxiality and centring after assembly, and improving the assembly efficiency.

[0079] Preferably, the rotating shaft 5 is one of a regular quadrangular prism, a regular hexagonal prism and a regular octagonal prism;

[0080] The blade 4 is connected by two identical blade plates 41 which are centrally symmetrical, the blade plates 41 are airfoil-shaped, and the two ends of the blade plates 41 are provided with limiting blocks 42, one blade 4 is provided with two limiting blocks 42, the limiting blocks 42 are in the shape of "[", the limiting blocks 42 have the same length as the blade plates 41, the two short edges of the limiting blocks 42 are provided with limiting grooves suitable for the shape of the rotating shaft 5, and two blade plates 41 together form a limiting hole with the same shape as the rotating shaft 5.

[0081] Specifically, two blade plates 41 together form a limiting hole, the limiting blocks 42 are in the shape of "[", and the length of the limiting blocks 42 is equal to the length of the blade plates 41, such a structure is easy to process and manufacture, and the number of parts required for assembly is reduced, the efficiency is higher, the accuracy of assembly is ensured, and such a design can effectively disperse stress and avoid stress concentration, thereby improving the overall strength and service life of the blade 4.

[0082] The blade 4 is formed by two identical blade plates 41 connected symmetrically at the center, effectively reducing the weight of the blade 4. Preferably, the blade plate 41 is streamlined by cold forming process, which enhances the rigidity of the blade 4, effectively reduces flow resistance, reduces pressure loss when fluid passes through, optimizes aerodynamic performance, and improves the efficiency of the fire damper.

[0083] Preferably, the blade 4 is provided with a blade seal 43 on its upper or lower edge, and the edge of the blade 4 with the blade seal 43 overlaps with the edge of the adjacent blade 4 without the blade seal 43. The blade seal 43 is provided with a deformation part 431, and the deformation part 431 is located at the contact point of the adjacent blades 4.

[0084] Specifically, when the fire damper is closed, such as Figure 6 As shown, the edge of the blade 4 with the blade seal 43 overlaps with the edge of the adjacent blade 4 without the blade seal 43. The blade seal 43 has a deformation part 431. When the fire damper is closed, the adjacent blades 4 overlap, and the deformation part 431 is located at the contact point of the adjacent blades 4. The blade seal 43 deforms to ensure that there is no gap between the adjacent blades 4. That is, the blade seal 43 seals the gap between the blades 4, improves the sealing performance of the fire damper, and further ensures that the fire damper has the required low leakage performance.

[0085] Preferably, a valve body seal 6 is provided between the blade 4 and the left inner frame 111 and the right inner frame 121. The valve body seal 6 is arched and has several round holes in the middle. The round holes of the valve body seal 6 correspond to the rotating shaft 5, and the rotating shaft 5 can pass through the round holes of the valve body seal 6.

[0086] Specifically, the valve body seal 6 is located between the blade 4 and the left inner frame 111 and the right inner frame 121, that is, the valve body seal 6 is located on both sides of the blade 4. The valve body seal 6 has several round holes in the middle, and the round holes correspond to the rotating shaft 5. That is, the number of round holes on one side is equal to the number of rotating shafts 5. The rotating shaft 5 can pass through the round holes of the valve body seal 6, indicating that the valve body seal 6 does not affect the rotation of the rotating shaft 5, nor does it affect the rotation of the blade 4. The blade 4, the left inner frame 111, and the right inner frame 121 together press the valve body seal 6 tightly to ensure efficient sealing.

[0087] Furthermore, the linkage mechanism 2 also includes a number of washers 23 and a number of pins 24, the number of pins 24 being equal to the number of rotating arms 22, and the number of washers 23 being twice the number of pins 24;

[0088] One end of the rotating arm 22 is a fixing hole adapted to the shape of the rotating shaft 5. The rotating shaft 5 passes through the fixing hole of the rotating arm 22 and is connected to the rotating arm 22. The other end of the rotating arm 22 is a round hole. The round hole of the rotating arm 22 corresponds one-to-one with the through hole of the long connecting rod 21. The pin 24 passes through the round hole and the through hole of the rotating arm 22 and connects the long connecting rod 21 and the rotating arm 22.

[0089] like Figure 13 As shown, one end of the rotating arm 22 can be fastened into the rotating shaft 5, and its axial sliding can be restricted by the positioning screw. The other end of the rotating arm 22 is a round hole. After the washer 23 is placed and it matches the through hole on the long connecting rod 21, the sliding is constrained by the pin 24. The pin 24 can be fixed to slide axially by the cotter pin, which effectively prevents the axial displacement of the rotating arm 22 during operation, ensuring its stability and reliability on the rotating shaft 5. This ensures that the linkage mechanism 2 is adaptable to application environments with high vibration, high load and frequent start and stop. Under the drive of the drive mechanism 3, it can respond quickly, allowing the fire damper to open flexibly when needed. At the same time, the cooperation of the washer 23 and the pin 24 ensures the smoothness of the movement, reduces friction and wear between the components, and improves the service life and reliability of the fire damper.

[0090] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A nuclear-grade low-leakage fire damper, characterized in that: It includes the valve body, linkage mechanism, drive mechanism, blades, and shaft; The valve body includes a valve seat, a left inner frame, a left outer frame, a right inner frame, a right outer frame, an upper frame, and a lower frame. The left inner frame, the right inner frame, the upper frame, and the lower frame are welded and assembled into a frame structure. The valve seat is provided on the inner wall of the upper frame and the lower frame, respectively. A plurality of blades are rotatably mounted on the frame structure via the rotating shafts. The number of blades is equal to the number of rotating shafts. The plurality of rotating shafts are connected by the linkage mechanism. The driving end of the driving mechanism is connected to any of the rotating shafts. The driving mechanism is used to drive the rotating shafts to rotate. The rotation of the rotating shafts drives the rotation of the plurality of blades through the linkage mechanism. The left outer frame is detachably installed on the left side of the frame structure, and the right outer frame is detachably installed on the right side of the frame structure. The left and right outer frames respectively form a sealed cavity with the frame structure, and the cavity is used to accommodate the linkage mechanism.

2. The nuclear-grade low-leakage fire damper according to claim 1, characterized in that: Both the left outer frame and the right outer frame include an outer frame plate and a sealing plate. The cross-sectional shape of the outer frame plate is "bow" shaped, and the sealing plate is welded to both ends of the outer frame plate. The sealing plate has an "L" shaped cross-section, with its opening facing the upper / lower frame. One side of the sealing plate is located between the outer frame and the upper / lower frame, while the other side is welded to the end of the upper / lower frame.

3. The nuclear-grade low-leakage fire damper according to claim 2, characterized in that: The cross-sectional shape of the upper frame, the lower frame, the left inner frame, and the right inner frame is "[" shaped with the opening facing outwards. The middle of the short side of the left inner frame and the right inner frame is provided with a protrusion. The left inner frame and the right inner frame are respectively inserted into the middle groove of the left outer frame and the right outer frame. The linkage mechanism is sealed in the receiving cavity formed by the left outer frame and the left inner frame and the receiving cavity formed by the right outer frame and the right inner frame.

4. A nuclear-grade low-leakage fire damper according to claim 3, characterized in that: The thickness of the left inner frame and the right inner frame is less than the thickness of the outer frame plate, and the protrusion is an outwardly arched arc. The total width W1 of the left inner frame or right inner frame plus the arc that arches outward from the middle of its short side is greater than the width W2 of the groove in the middle of the left outer frame or right outer frame, and the difference between W1 and W2 is 0.2-0.3mm.

5. A nuclear-grade low-leakage fire damper according to claim 1, characterized in that: The left inner frame and the right inner frame are respectively provided with a number of corresponding shaft holes, and the rotating shaft is installed between two corresponding shaft holes; There are two linkage mechanisms, which are located in the left inner frame and the right inner frame respectively. Each linkage mechanism includes a long connecting rod and several rotating arms. Each rotating arm corresponds to a shaft hole. The rotating shaft passes through the shaft hole and then through the rotating arm. Several rotating arms are mounted on the long connecting rod. The shaft hole is nozzle-shaped, and the radius of the shaft hole increases from the outside to the inside. Both ends of the rotating shaft are provided with an outer shaft sleeve and an inner shaft sleeve. The outer shaft sleeve is rotatably disposed in the shaft hole and is adapted to the shape of the shaft hole. The inner shaft sleeve is rotatably disposed in the outer shaft sleeve and is adapted to the shape of the rotating shaft. The rotating arms are engaged at both ends of the rotating shaft and located outside the shaft hole.

6. A nuclear-grade low-leakage fire damper according to claim 1, characterized in that: The rotating shaft is one of a regular square prism, a regular hexagonal prism, and a regular octagonal prism; The blade is formed by connecting two blade plates of the same shape symmetrically at the center. The blade plates are wing-shaped and have limiting blocks at both ends. Each blade has four limiting blocks. The limiting blocks are cuboids with grooves that are adapted to the shape of the rotating shaft. The two blade plates together form a limiting hole with the same shape as the rotating shaft.

7. A nuclear-grade low-leakage fire damper according to claim 1, characterized in that: The rotating shaft is one of a regular square prism, a regular hexagonal prism, and a regular octagonal prism; The blade is formed by connecting two blade plates of the same shape symmetrically at the center. The blade plate is wing-shaped. A limiting block is welded to the blade plate. Each blade has two limiting blocks. The limiting blocks are "[" shaped. The limiting blocks are the same length as the blade plates. The two short sides of the limiting blocks are provided with limiting grooves that are adapted to the shape of the rotating shaft. The two blade plates together form a limiting hole with the same shape as the rotating shaft.

8. A nuclear-grade low-leakage fire damper according to claim 1, characterized in that: The blade is provided with a blade seal on its upper or lower edge. The edge of the blade with the blade seal overlaps with the edge of the adjacent blade without the blade seal. The blade seal is provided with a deformation part located at the contact point of the adjacent blades.

9. A nuclear-grade low-leakage fire damper according to claim 1, characterized in that: A valve body seal is provided between the blade and the left inner frame and the right inner frame. The valve body seal is arched and has several round holes in the middle. The round holes of the valve body seal correspond to the rotating shaft, and the rotating shaft can pass through the round holes of the valve body seal.

10. A nuclear-grade low-leakage fire damper according to claim 5, characterized in that: The linkage mechanism also includes a number of washers and a number of pins, the number of pins being equal to the number of the rotating arms, and the number of washers being twice the number of pins; One end of the rotating arm has a fixing hole that matches the shape of the rotating shaft. The rotating shaft passes through the fixing hole of the rotating arm and is connected to the rotating arm. The other end of the rotating arm has a round hole. The round hole of the rotating arm corresponds one-to-one with the through hole of the long connecting rod. The pin passes through the round hole and the through hole of the rotating arm and connects the long connecting rod to the rotating arm.

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