Nuclear-grade low-leakage fireproof valve

Abstract

The nuclear-grade low-leakage fireproof valve 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 present invention relates to the technical field of fire damper structures, and particularly to a nuclear-grade fire damper with low leakage. Background Art

[0002] According to "Fire Dampers for Ventilation and Smoke Exhaust Systems in Nuclear Power Plants" (NB / T 20417-2017), a fire damper is installed on the supply and return air ducts of a ventilation and air conditioning system or on a fire boundary. Usually, it is in an open state. In case of a fire, when the smoke temperature in the duct or on the fire boundary reaches the set temperature, it closes, or is closed by a fire control system.

[0003] Currently, there are mainly two installation methods for the link mechanism of a fire damper: external type and internal type. The external link mechanism is installed outside the damper frame of the fire damper, while the internal link mechanism is installed inside the damper frame of the fire damper and is usually integrated with the blades or actuators of the valve. However, in an environment involving the transportation of radioactive media such as a nuclear power station, the sealing performance of the fire damper is crucial. The external link mechanism will cause multiple exposed rotating shafts to be added to the damper frame, thus increasing the risk of external leakage, which can neither ensure the safe isolation of radioactive media nor prevent environmental pollution. Moreover, after the secondary pouring in the wall, the external link mechanism will not be able to operate, which is not conducive to wall installation. For the fire damper with an internal link mechanism, foreign object jamming is likely to occur. Especially during a fire, if the temperature does not reach the set value and the fire damper is not closed, foreign objects at the fire site may be stuck to the link mechanism along the ventilation duct, resulting in the failure of the fire damper to close when the set temperature is reached. Furthermore, if the link mechanism is set on the combustion surface, any part of the link mechanism being burned or deformed may cause the valve to be unable to be sealed. To ensure the sealing performance of the fire damper, the link mechanism is usually set on the backfire surface, but this violates the standard requirement of "Fire Dampers for Ventilation and Smoke Exhaust Systems in Nuclear Power Plants" that "fire resistance tests are carried out in both positive and negative airflow directions of the valve". That is, these two installation methods of the link mechanism cannot fully meet the requirements of high-safety environments such as nuclear power plants.

[0004] Therefore, generally, on the basis of the external link mechanism, a cover is added outside the link mechanism to seal the link mechanism. However, in order to prevent external leakage, full welding or bolt fixing is required, which has a large workload and is prone to deformation, affecting the normal operation of the fire damper. Summary of the Invention

[0005] Aiming at the above defects, the purpose of the present invention is to provide a nuclear-grade fire damper with low leakage, which solves the problems that the current installation methods of the link mechanism of the fire damper cannot fully meet the requirements of high-safety environments and affect the normal operation of the fire damper.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A nuclear-grade low-leakage fire damper comprises 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 frame and a lower frame, wherein 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 inner walls of the upper frame and the lower frame are respectively provided with the valve seat;

[0009] The plurality of blades are rotatably mounted on the frame structure through the rotating shafts, the number of the blades is equal to the number of the rotating shafts, the plurality of rotating shafts are transmission-connected through the connecting rod 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, 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, and the right outer frame is detachably mounted on the right side of the frame structure. A sealed accommodating cavity is formed between the left outer frame and the right outer frame and the frame structure respectively, and the accommodating cavity is used to accommodate the connecting rod mechanism.

[0011] Preferably, the left outer frame and the right outer frame each include an outer frame plate and a sealing plate, the cross-section of the outer frame plate is in the shape of a "bow", and the sealing plate is welded to both ends of the outer frame plate;

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

[0013] Furthermore, the cross-sectional shape of the upper frame, the lower frame, the left inner frame and the right inner frame is a "[" shape with the opening direction facing outward, a protrusion is provided in the middle of the short sides of the left inner frame and the right inner frame, the left inner frame and the right inner frame are respectively inserted into the middle grooves of the left outer frame and the right outer frame, and the connecting rod mechanism is sealed in the accommodating cavity formed by the left outer frame and the left inner frame and the accommodating cavity formed by the right outer frame and the right inner frame.

[0014] Furthermore, the thickness of the left inner frame and the right inner frame is less than the thickness of the outer frame plate, and the raised portion is an arc that arches outwards;

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

[0016] Preferably, the left inner frame and the right inner frame are respectively provided with a plurality of corresponding shaft holes, and the rotating shafts are respectively installed between two corresponding shaft holes;

[0017] There are two link mechanisms, and the two link mechanisms are respectively located inside the left inner frame and the right inner frame. The link mechanism includes a long link and a plurality of rotating arms. The rotating arms correspond to the shaft holes one by one. After the rotating shaft passes through the shaft hole, it then passes through the rotating arm, and a plurality of the rotating arms are arranged on the long link;

[0018] The shaft hole is in the shape of a nozzle, 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 arranged in the shaft hole, and the outer shaft sleeve is adapted to the shape of the shaft hole. The inner shaft sleeve is rotatably arranged inside the outer shaft sleeve, and the inner shaft sleeve is adapted to the shape of the rotating shaft;

[0019] The rotating arm is clamped at both ends of the rotating shaft and is 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 blade is symmetrically connected at the center by two blade plates with the same shape. The blade plate is in the shape of an airfoil. Limiting blocks are provided at both ends of the blade plate. One blade is provided with four limiting blocks. The limiting block is a cuboid provided with a groove 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.

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

[0023] The blade is symmetrically connected at the center by two blade plates with the same shape. The blade plate is in the shape of an airfoil. A limiting block is welded to the blade plate. One blade is provided with two limiting blocks. The limiting block is in the shape of "[", and the limiting block has the same length as the blade plate. Limiting grooves adapted to the shape of the rotating shaft are provided on the two short sides of the limiting block. The two blade plates together form a limiting hole with the same shape as the rotating shaft.

[0024] Preferably, a blade seal is provided on the upper edge or the lower edge of the blade. The edge of the blade provided with the blade seal overlaps with the edge of the adjacent blade not provided with the blade seal. The blade seal is provided with a deformation part, and the deformation part is located at the joint of adjacent blades.

[0025] Preferably, a valve body seal is provided between the blade and each of the left inner frame and the right inner frame. The valve body seal is arched, and a number of round holes are provided in the middle of the valve body seal. 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.

[0026] Furthermore, the link mechanism further includes a number of washers and a number of pin shafts. The number of pin shafts is equal to the number of swing arms, and the number of washers is twice the number of pin shafts.

[0027] One end of the swing arm is a fixing hole adapted to the shape of the rotating shaft. The rotating shaft passes through the fixing hole of the swing arm to connect with the swing arm. The other end of the swing arm is a round hole, and the round holes of the swing arm correspond one-to-one with the through holes of the long link. The pin shaft passes through the round hole of the swing arm and the through hole to connect the long link and the swing arm.

[0028] The technical solution provided by the present invention may include the following beneficial effects:

[0029] The link 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 to seal the link mechanism, reducing external leakage. Moreover, the left and right inner frames are provided with protruding parts, which are adapted to the middle grooves of the left and right outer frames and are in interference fit to reduce the occurrence of internal leakage, ensuring the low leakage of the fire damper. At the same time, the left and right outer frames are provided with sealing plates to prevent fluid from flowing out through the gaps of the fire damper frame, adapting to the height of the fire damper and ensuring the sealing performance of the fire damper to achieve the purpose of low leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural view of an embodiment of the present invention.

[0031] Figure 2 is a schematic structural view of the blade of an embodiment of the present invention when it is opened.

[0032] Figure 3 is an exploded schematic structural view of an embodiment of the present invention.

[0033] Figure 4 is a schematic structural view of the valve body of the present invention.

[0034] Figure 5 is a front view of an embodiment of the present invention.

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

[0036] Figure 7 is a schematic structural view of the blade seal of the present invention.

[0037] Figure 8 isFigure 5 The sectional view taken along line B-B.

[0038] Figure 9 is Figure 8 An enlarged view of Q in

[0039] Figure 10 It is a schematic top view of the left outer frame and the left inner frame of the present invention.

[0040] Figure 11 It is a comparison schematic diagram of the left outer frame and the left inner frame of the present invention.

[0041] Figure 12 It is another comparison schematic diagram of the left outer frame and the left inner frame of the present invention.

[0042] Figure 13 It is a schematic structural diagram of the link mechanism of the present invention.

[0043] Wherein: valve body 1, left inner frame 111, left outer frame 112, right inner frame 121, right outer frame 122, upper frame 13, lower frame 14, valve seat 15, shaft hole 16, convex portion 17, outer frame plate 18, sealing plate 19, link mechanism 2, long link 21, swing arm 22, washer 23, pin shaft 24, drive mechanism 3, blade 4, blade plate 41, limit block 42, blade seal 43, deformation portion 431, rotating shaft 5, outer shaft sleeve 51, inner shaft sleeve 52, valve body seal 6. Detailed implementation manners

[0044] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the features defined with "first", "second" may explicitly or implicitly include one or more of such features, used to distinguish and describe the features, without order and without importance.

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

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The present invention provides a nuclear-grade low-leakage fire damper, comprising a valve body 1, a connecting rod mechanism 2, a driving mechanism 3, a blade 4 and a rotating shaft 5;

[0049] The valve body 1 comprises a valve seat 15, a left inner frame 111, a left outer frame 112, a right inner frame 121, a right outer frame 122, an upper frame 13 and a 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] The plurality of blades 4 are rotatably mounted on the frame structure through the rotating shafts 5, respectively. The number of the blades 4 is equal to the number of the rotating shafts 5. The plurality of rotating shafts 5 are connected by transmission through the connecting rod mechanism 2. The driving end of the driving mechanism 3 is connected to any of the rotating shafts 5. The driving mechanism 3 is used to drive the rotating shafts 5 to rotate. The rotation of the rotating shaft 5 drives the rotation of the 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, and the right outer frame 122 is detachably mounted on the right side of the frame structure. A sealed accommodating cavity is formed between the left outer frame 112 and the right outer frame 122 and the frame structure respectively, and the accommodating cavity is used to accommodate the connecting rod mechanism 2.

[0052] For the fire damper of the present invention, 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. The left outer frame 112 is detachably installed on the left side of the frame structure, and the right outer frame 122 is detachably installed on the right side of the frame structure. An enclosed accommodation cavity is formed between the left outer frame 112 and the right outer frame 122 and the frame structure respectively, and the accommodation cavity is used to accommodate the link mechanism 2. When a fire occurs, even if the temperature does not reach the set value and the fire damper is not closed, foreign objects at the fire location will not jam the link mechanism 2 as they follow the ventilation duct to the fire damper, ensuring that when the set temperature is reached subsequently, the fire damper can close smoothly as required and there will be no situation where the fire damper cannot close normally due to foreign object jamming. At the same time, compared with the external link mechanism 2, in the present invention, the link mechanism 2 is sealed within the left and right frames. The left outer frame 112 and the right outer frame 122 are provided to form an enclosed space with the left inner frame 111 and the right inner frame 121 respectively, further reducing the external leakage at the link mechanism 2. This solves the problem in the prior art that the external link mechanism 2 and the internal link structure are prone to leakage and cannot fully meet the requirements of high-safety environments such as nuclear power plants.

[0053] Moreover, 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. The left outer frame 112 is detachably installed on the left side of the frame structure, and the right outer frame 122 is detachably installed on the right side of the frame structure. The left outer frame 112 and the right outer frame 122 enable the fire damper to still operate normally after the second pouring in the wall.

[0054] In addition, two valve seats 15 are provided. The two valve seats 15 are respectively arranged on the inner walls of the upper frame 13 and the lower frame 14 and are connected to the blade 4 to prevent gaps between the blade 4 and the upper frame 13 or the lower frame 14, further improving the sealing performance of the fire damper.

[0055] Preferably, both the left outer frame 112 and the right outer frame 122 include an outer frame plate 18 and a sealing plate 19. The cross-sectional shape of the outer frame plate 18 is in the shape of a "bow", and the sealing plate 19 is welded to both ends of the outer frame plate 18;

[0056] The cross-sectional shape of the sealing plate 19 is in the shape of an "L". The opening direction of the sealing plate 19 faces the upper frame 13 / lower frame 14. One side of the sealing plate 19 is located between the outer frame plate 18 and the upper frame 13 / lower frame 14, and the other side is welded to the end of the upper frame 13 / lower frame 14.

[0057] Specifically, as Figure 3As shown, the left outer frame 112 or the right outer frame 122 respectively includes an outer frame plate 18 and sealing plates 19 at both ends. The cross-sectional shape of the outer frame plate 18 is a "bow" shape. The bow-shaped cross-section enables it to better disperse stress when subjected to force, reduce stress concentration, thereby improving the overall strength to several times that of the ordinary shape. The arc structure of the bow-shaped cross-section is similar to an arch structure and has good mechanical properties. When subjected to force, the bow-shaped cross-section can disperse the external force to the entire structure instead of concentrating it at a certain point, thereby improving the stability and deformation resistance of the structure. In addition, while maintaining the structural strength, the thickness of the plate can be reduced, realizing the lightweight of the fire damper structure. The fire damper becomes lighter without sacrificing strength, while maintaining the required structural stability and durability.

[0058] In addition, the sealing plate 19 is welded to both ends of the outer frame plate 18, similar to the hull structure. During installation, the left inner frame 111 and the right inner frame 121 have limited the height of the valve frame, and the left outer frame 112 and the right outer frame 122 need to be snapped together. However, there are manufacturing errors. There are gaps between the left outer frame 112 and the left inner frame 111, and between the right outer frame 122 and the right inner frame 121. If there is no sealing plate 19, but only the outer frame plate 18, when the fire damper is closed, the fluid will flow out from the four corners of the valve frame, that is, there is a gap between the upper frame 13 or the lower frame 14 and the left frame or the right frame, and the sealing cannot be guaranteed. The cross-sectional shape of the sealing plate 19 is "L"-shaped, and the opening direction of the sealing plate 19 corresponds to the upper frame 13 / lower frame 14. One side of the sealing plate 19 is located between the outer frame plate 18 and the upper frame 13 / lower frame 14, and the other side is welded to the end of the upper frame 13 / lower frame 14. Because the sealing plate 19 is welded to the end of the upper frame 13 or the lower frame 14, the gas cannot leak from the gap, which effectively blocks external leakage.

[0059] Furthermore, the cross-sectional shape of the upper frame 13, the lower frame 14, the left inner frame 111 and the right inner frame 121 is a "[" shape with the opening direction facing outward, a protrusion 17 is provided in the middle of the short sides of the left inner frame 111 and the right inner frame 121, the left inner frame 111 and the right inner frame 121 are respectively inserted into the middle grooves of the left outer frame 112 and the right outer frame 122, and the connecting rod mechanism 2 is sealed in the accommodating cavity formed by the left outer frame 112 and the left inner frame 111 and the accommodating cavity formed by the right outer frame 122 and the right inner frame 121.

[0060] In order to solve the leakage problem of the external connecting rod structure, a certain cover body is set 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. Figure 11As shown, full welding is generally used for connection to seal the link mechanism 2 and reduce external leakage. However, welding requires a large amount of work and causes significant deformation, which can deform the left outer frame 112 and the right outer frame 122, thereby affecting the rotation of the rotating shaft 5 and ultimately resulting in ineffective sealing when the blade 4 closes and failure. If not welded, as Figure 12 shown, bolt connection is usually adopted, and the installation method of the bolts needs to be considered. Countersunk head screws are used to drill holes in the left outer frame 112 and the right outer frame 122. However, the structure cannot be strengthened by drilling holes, and the rigidity of the left outer frame 112 and the right outer frame 122 decreases. Or welding and bolts are used for joint fixation, but welding requires a large amount of work and the bolts will wear after being disassembled and installed multiple times and cannot be replaced, resulting in limited service life.

[0061] Therefore, in the present invention, the left side frame of the valve frame includes a left inner frame 111 and a left outer frame 112, the right side frame of the valve frame includes a right inner frame 121 and a right outer frame 122. The cross-sectional shapes of the left inner frame 111 and the right inner frame 121 are in the shape of "[", with the opening direction facing outwards. The cross-sectional shapes of the left outer frame 112 and the right outer frame 122 are in the shape of "bow". A convex portion 17 is provided in the middle of the short sides of the left inner frame 111 and the right inner frame 121. The left inner frame 111 and the right inner frame 121 are respectively inserted into the middle grooves of the left outer frame 112 and the right outer frame 122. The link mechanism 2 is sealed within the left outer frame 112 and the left inner frame 111, and the right outer frame 122 and the right inner frame 121. An interference fit is formed between the convex portions 17 of the left side frame and the right side frame and the middle grooves of the left outer frame 112 and the right outer frame 122, as Figure 9 shown. This precise fitting method not only ensures that the fire damper can more effectively block the leakage of gas in the pipeline when closed, but also enhances the sealing performance of the overall structure. The efficiency of the fire damper in preventing gas leakage has been significantly improved, thereby improving the reliability and practicality of the product while ensuring safety performance. Solve the problems of large workload, limited service life, and affecting the normal operation of the fire damper when sealing the link mechanism 2.

[0062] Furthermore, the thicknesses of the left inner frame 111 and the right inner frame 121 are less than the thickness of the outer frame plate 18, and the convex portion 17 is an arc arched outwards;

[0063] The total width W1 of the width of the left inner frame 111 or the right inner frame 121 plus the arc arched outwards in the middle of its short side is greater than the width W2 of the middle groove of the left outer frame 112 or the right outer frame 122, and the difference between W1 and W2 is 0.2 - 0.3 mm.

[0064] Specifically, the thicknesses of the left inner frame 111 and the right inner frame 121 are less than the thickness of the plate of the outer frame plate 18, which can quickly snap-fit the left inner frame 111 with the left outer frame 112 and the right inner frame 121 with the right outer frame 122, facilitating interference fit and effectively preventing loosening and relative displacement between the left inner frame 111 and the left outer frame 112, and between the right inner frame 121 and the right outer frame 122, thereby improving the stability and reliability of the overall structure.

[0065] Moreover, as Figure 10 shown, the difference between the width W1 and the width W2 is 0.2 - 0.3 mm. Controlling within this difference range ensures closer contact and smaller gaps between the left outer frame 112 and the left inner frame 111, and between the right outer frame 122 and the right inner frame 121, further reducing internal leakage, making the valve frame more stable when bearing external loads, and reducing the risk of structural failure caused by component loosening or excessive gaps. 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 corresponding number of shaft holes 16, and the rotating shafts 5 are respectively installed between the two corresponding shaft holes 16;

[0067] The number of the link mechanisms 2 is two, and the two link mechanisms 2 are respectively located inside the left inner frame 111 and the right inner frame 121. The link mechanism 2 includes a long link 21 and a plurality of rotating arms 22. The rotating arms 22 correspond to the shaft holes 16 one by one. After the rotating shaft 5 passes through the shaft hole 16, it then passes through the rotating arms 22, and a plurality of the rotating arms 22 are arranged on the long link 21;

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

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

[0070] It should be noted that the left inner frame 111 and the right inner frame 121 are respectively provided with a corresponding number of shaft holes 16, and the number of the shaft holes 16 corresponds to the number of the rotating shafts 5 one by one; the link mechanism 2 includes a long link 21 and a plurality of swing arms 22, and the number of the swing arms 22 corresponds to the number of the shaft holes 16 one by one; the number of the blades 4 is equal to that of the rotating shafts 5, and the driving mechanism 3 is connected to the link mechanism 2 and is used to control the link mechanism 2 to drive the blades 4 to close. The driving mechanism 3 drives the long link 21 of the link mechanism 2 to move, and then drives the swing arms 22, so that the rotating shafts 5 rotate, driving the blades 4 to rotate, realizing the closing and opening of the fire damper.

[0071] Specifically, the swing arms 22 are clamped at both ends of the rotating shafts 5, the long link 21 is connected to the swing arms 22, one end of the swing arms 22 is a round hole, the long link 21 is provided with a round hole corresponding to the swing arms 22, and the round holes of the swing arms 22 and the long link 21 are constrained to slide through a pin shaft 24. Driven by the driving mechanism 3, the rotating shafts 5 connected to the driving mechanism 3 rotate, driving the swing arms 22 connected to the rotating shafts 5, and then driving the long link 21 to move. The sliding of the long link 21 drives all the swing arms 22 connected thereto to rotate together, and the circumferential angles of all the rotating shafts 5 are the same, so as to control the rotation of the blades 4 and change the state of the fire damper.

[0072] Among them, both the outer shaft sleeve 51 and the inner shaft sleeve 52 can rotate, and only the valve frame is fixed. This greatly reduces the resistance, significantly reduces the torque requirement of the fire damper during operation, thereby reducing the energy consumption and operation cost, and also avoids the valve frame deformation affecting the rotation of the rotating shafts 5, improving the efficiency.

[0073] In addition, as Figure 4 shown, the shaft holes 16 are in a nozzle shape. Through its special geometric structure, the nozzle-shaped shaft holes 16 can disperse the stress to a larger area, thereby reducing the local stress peak value, achieving the reinforcement effect of the opening part, ensuring that the strength requirements of the structure are met. At the same time, the nozzle shape of the shaft holes 16 is adapted to the shape of the outer shaft sleeve 51, which is beneficial to the smooth rotation of the outer shaft sleeve 51. The nozzle-shaped shaft holes 16 can enhance the structural stability of the left inner frame 111 and the right inner frame 121, and also ensure the flexibility and accuracy of the outer shaft sleeve 51 during operation.

[0074] Preferably, the shaft holes 16 are formed by precision stamping process, which can effectively ensure the dimensional accuracy and shape accuracy of the shaft holes 16, reduce processing defects, and avoid stress concentration caused by inaccurate processing, thereby improving the overall strength of the structure.

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

[0076] The blade 4 is formed by symmetrically connecting two blade plates 41 with the same shape at the center. The blade plates 41 are in the shape of an airfoil. Limit blocks 42 are provided at both ends of the blade plates 41. One blade 4 is provided with four limit blocks 42. The limit blocks 42 are cuboids provided with grooves adapted to the shape of the rotating shaft 5. The two blade plates 41 together form a limit hole with the same shape as the rotating shaft 5.

[0077] It should be noted that the rotating shaft 5 penetrates the entire blade 4, that is, the length of the rotating shaft 5 is greater than that of the blade 4. The rotating shaft 5 is one of a regular quadrangular prism, a regular hexagonal prism, and a regular octagonal prism. In this way, the limit block 42 and the blade plate 41 can jointly limit the rotating shaft 5. When the rotating shaft 5 rotates, it exerts a certain pressure on the limit block 42 and the blade plate 41, driving the blade 4 to rotate. Selecting one of a regular quadrangular prism, a regular hexagonal prism, and a regular octagonal prism ensures that the rotation of the rotating shaft 5 can drive the blade 4 to rotate. The regular prism has uniform stress and better transmission efficiency.

[0078] In addition, limit blocks 42 are provided at both ends of the blade plate 41. The limit blocks 42 are cuboids provided with grooves adapted to the shape of the rotating shaft 5. When two blade plates 41 with the same shape are symmetrically distributed and connected at the center, the grooves of the limit blocks 42 and the blade plates 41 jointly fix the rotating shaft 5. The limit blocks 42 adopt a cuboid structure, which is easy to process and manufacture. At the same time, the shape of the grooves of the limit blocks 42 can be precisely matched with the rotating shaft 5, ensuring the coaxiality and centering 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 formed by symmetrically connecting two blade plates 41 with the same shape at the center. The blade plates 41 are in the shape of an airfoil. A limit block 42 is welded to the blade plate 41. One blade 4 is provided with two limit blocks 42. The limit block 42 is in the shape of "[", and the limit block 42 has the same length as the blade plate 41. Limiting grooves adapted to the shape of the rotating shaft 5 are provided on the two short sides of the limit block 42. The two blade plates 41 together form a limit hole with the same shape as the rotating shaft 5.

[0081] Specifically, by jointly forming a limit hole by two blade plates 41, the limit block 42 is in the shape of "[", and the length of the limit block 42 is equal to the length of the blade plate 41. This structure is easy to process and manufacture, and the number of parts to be assembled is reduced during assembly, with higher efficiency, ensuring the accuracy of assembly. And this design can effectively disperse stress, avoid stress concentration, thereby improving the overall strength and service life of the blade 4.

[0082] The blade 4 is formed by symmetrically connecting two blade plates 41 with the same shape at the center, effectively reducing the weight of the blade 4. Preferably, the blade plate 41 adopts a cold forming process to achieve a streamlined structure, enhancing the rigidity of the blade 4, effectively reducing the flow resistance, reducing the pressure loss when the fluid passes through, optimizing the aerodynamic performance, and improving the efficiency of the fire damper.

[0083] Preferably, a blade seal 43 is provided at the upper edge or the lower edge of the blade 4. The edge of the blade 4 provided 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 joint of the adjacent blades 4.

[0084] Specifically, when the fire damper is closed, as Figure 6 shown, the edge of the blade 4 provided 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. When the fire damper is closed, the adjacent blades 4 overlap, the deformation part 431 is located at the joint of the adjacent blades 4, and the blade seal 43 deforms to ensure that there is no gap between the adjacent blades 4, that is, the blade seal 43 closes the gap between the blades 4, improving the sealing performance of the fire damper and further ensuring 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 respectively. The valve body seal 6 is arched, and a plurality of round holes are provided in the middle of the valve body seal 6. 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. A plurality of round holes are provided in the middle of the valve body seal 6, 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 the 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 or the rotation of the blade 4. The blade 4, the left inner frame 111, and the right inner frame 121 jointly press the valve body seal 6 tightly to ensure efficient sealing.

[0087] Furthermore, the link mechanism 2 further includes a plurality of washers 23 and a plurality of pin shafts 24. The number of the pin shafts 24 is equal to the number of the swing arms 22, and the number of the washers 23 is twice the number of the pin shafts 24;

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

[0089] like Figure 13 As shown, one end of the swing arm 22 can be buckled in the rotating shaft 5, and its axial sliding can be limited by a positioning screw. The other end of the swing arm 22 is a circular hole. After the washer 23 is padded to be consistent with the through hole on the long connecting rod 21, the sliding is constrained by the pin shaft 24, and the pin shaft 24 can be fixed by a cotter pin to prevent axial displacement of the swing arm 22 during operation, ensuring its stability and reliability on the rotating shaft 5, ensuring that the connecting rod mechanism 2 can adapt to the application environment of high vibration, high load and frequent start and stop, and under the drive of the driving mechanism 3, it can respond quickly, allowing the fire damper to be flexibly opened when needed, and at the same time, through the cooperation of the washer 23 and the pin shaft 24, the smoothness of the movement is ensured, the friction and wear between the components are reduced, and the service life and reliability of the fire damper are improved.

[0090] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A nuclear grade low leakage fire damper, characterized by: It includes a valve body, a connecting rod mechanism, a driving mechanism, blades and a rotating shaft; 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 frame and a lower frame, wherein 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 inner walls of the upper frame and the lower frame are respectively provided with the valve seat; The plurality of blades are rotatably mounted on the frame structure through the rotating shafts, the number of the blades is equal to the number of the rotating shafts, the plurality of rotating shafts are transmission-connected through the connecting rod 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, and the rotation of the rotating shaft drives the rotation of the plurality of blades through the connecting rod mechanism; The left outer frame is detachably mounted on the left side of the frame structure, and the right outer frame is detachably mounted on the right side of the frame structure. A sealed accommodating cavity is formed between the left outer frame and the right outer frame and the frame structure respectively, and the accommodating cavity is used to accommodate the connecting rod mechanism.

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

3. A 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 a "[" shape with the opening direction facing outwards. A protrusion is provided in the middle of the short sides of the left inner frame and the right inner frame. The left inner frame and the right inner frame are respectively inserted into the middle grooves of the left outer frame and the right outer frame. The connecting rod mechanism is sealed in the accommodating cavity formed by the left outer frame and the left inner frame and the accommodating 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 raised portion is an arc that arches outward; The total width W1 of the left inner frame or right inner frame plus the arc arched outward in the middle of its short side is greater than the width W2 of the middle groove 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 plurality of corresponding shaft holes, and the rotating shaft is respectively installed between two corresponding shaft holes; There are two connecting rod mechanisms, which are respectively located in the left inner frame and the right inner frame. The connecting rod mechanism includes a long connecting rod and a plurality of swing arms, and the swing arms correspond to the shaft holes one by one. The rotating shaft passes through the shaft hole and then passes through the swing arms, and the plurality of swing arms are arranged on the long connecting rod. The shaft hole is in the shape of a nozzle, the radius of the shaft hole increases from the outside to the inside, both ends of the shaft are provided with an outer shaft sleeve and an inner shaft sleeve, the outer shaft sleeve is rotatably arranged in the shaft hole, the outer shaft sleeve is adapted to the shape of the shaft hole, the inner shaft sleeve is rotatably arranged in the outer shaft sleeve, and the inner shaft sleeve is adapted to the shape of the shaft; The swing arms are clamped at two ends of the rotating shaft and are 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 quadrangular prism, a regular hexagonal prism and a regular octagonal prism; The blade is formed by two blade plates of the same shape connected symmetrically to the center. The blade plates are wing-shaped. Limit blocks are provided at both ends of the blade plates. One blade is provided with four limit blocks. The limit blocks are rectangular blocks with grooves adapted to the shape of the rotating shaft. The two blade plates together form a limit 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 quadrangular prism, a regular hexagonal prism and a regular octagonal prism; The blade is formed by two blade plates of the same shape connected symmetrically to the center, the blade plate is in the shape of a wing, a limit block is welded to the blade plate, one blade is provided with two limit blocks, the limit block is in the shape of "[", the limit block is the same length as the blade plate, the two short sides of the limit block are provided with limit grooves adapted to the shape of the rotating shaft, and the two blade plates together form a limit 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 upper edge or the lower edge of the blade is provided with a blade seal, the edge of the blade provided with the blade seal overlaps the edge of the adjacent blade not provided with the blade seal, and the blade seal is provided with a deformation portion, which is located at the joint of 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 respectively. The valve body seal is arched and has a plurality of circular holes in the middle thereof. The circular holes of the valve body seal correspond to the rotating shaft, and the rotating shaft can pass through the circular holes of the valve body seal.

10. A nuclear-grade low-leakage fire damper according to claim 5, characterized in that: The connecting rod mechanism further comprises a plurality of washers and a plurality of pins, the number of the pins is equal to the number of the swing arms, and the number of the washers is twice the number of the pins; One end of the swing arm is a fixing hole adapted to the shape of the rotating shaft, and the rotating shaft passes through the fixing hole of the swing arm and is connected to the swing arm. The other end of the swing arm is a circular hole, and the circular hole of the swing arm corresponds one-to-one to the through hole of the long connecting rod. The pin passes through the circular hole of the swing arm and the through hole to connect the long connecting rod and the swing arm.

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