A fire-proof check valve

Abstract

The present invention provides a fire check valve, comprising a valve body, a valve element and a supporting part, wherein an exhaust passage is arranged in the valve body, the supporting part is formed in the valve body and is located in the exhaust passage, the valve element can be opened and closed on the valve body, the valve element comprises a valve plate part and an air guide part arranged on the periphery of the valve plate part; the valve plate part is provided with an annular seat ring and a valve plate body located inside the annular seat ring, the supporting part has a matching surface, when the valve element is in a closed state, the annular seat ring is attached to the matching surface of the supporting part, so that the valve plate body blocks the exhaust passage to form a sealed connection; the valve body has two opposite side walls, the air guide part has a square profile, the two side edges of the air guide part are gap-matched with the two side walls, and when the valve element is in an open state, the two side walls and the valve plate part and the air guide part form an outlet of the exhaust passage. The present invention is provided with a valve element capable of completely guiding air, so that the gas is discharged smoothly and the resistance of the discharged gas is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of residential exhaust ducts, and in particular relates to a fire-proof check valve capable of completely guiding air. Background Art

[0002] The fire check valve is an important component of the residential exhaust duct system. Its main function is to divert the exhaust smoke and prevent smoke backflow. At the same time, it is equipped with a locking structure to facilitate effective fire prevention when necessary to ensure safety. Its diversion function is mainly to open and close the exhaust channel through the back and forth swing of the valve element. When smoke exhaust is required, the valve element opens to form a flow outlet. After the smoke exhaust is completed, the valve element closes and forms a seal with the valve body to prevent smoke and odor from coming together.

[0003] For example, Chinese patent application 2016106548305 discloses a fire check valve, including a body, a valve plate and a connecting mechanism, wherein the body is provided with an exhaust port, the valve plate cover is arranged on the exhaust port, the body and the valve plate are connected through the connecting mechanism, the fire check valve also includes a fixing part and a flexible part for reducing the force of the valve plate hitting the body, one end of the fixing part is connected to the valve plate, and the other end of the fixing part squeezes the flexible part and clamps the flexible part between the fixing part and the valve plate.

[0004] For another example, Chinese patent application 2018112855827 discloses a fireproof check valve, comprising a valve body having an exhaust port and a valve plate for covering the exhaust port, wherein the inner periphery of the valve plate has an annular joining area for sealingly joining the exhaust port, and the inner side of the valve plate is connected to a guide plate extending into the interior of the valve body along at least a portion of the inner edge of the annular joining area.

[0005] For example, Chinese patent application 2018100495820 discloses a fireproof check valve, including a fireproof panel with an air inlet, a fireproof duct, a fireproof check plate and a fire fuse assembly. The fireproof check plate is fixedly connected to the fireproof duct or the fireproof panel by a hinge. A soft seal is provided at the air outlet end of the fireproof duct and / or the edge of the fireproof check plate. The fire fuse assembly includes a fuse piece and a push-up piece fixedly connected to the fuse piece.

[0006] The existing fire check valve still has the problem of poor exhaust and vortex at the outlet of the exhaust channel. Summary of the invention

[0007] In view of the defects of the prior art, the present invention provides a fire-proof check valve, which, by providing a valve element that can fully guide the air, discharges the gas smoothly, reduces the resistance of the exhaust gas, and avoids the formation of vortices at the outlet of the exhaust channel.

[0008] The specific technical solutions of the present invention are as follows:

[0009] A fireproof check valve comprises a valve body, a valve element and a supporting part, wherein an exhaust passage is arranged in the valve body, the supporting part is formed in the valve body and is located in the exhaust passage, the valve element is arranged on the valve body in an openable and closable manner, and cooperates with the supporting part to open or close the exhaust passage, and the valve element comprises a valve plate part for closing the exhaust passage and an air guide part arranged on the periphery of the valve plate part;

[0010] The valve plate part is provided with an annular seat ring protruding toward the inlet of the exhaust passage and a valve plate body located inside the annular seat ring, and the support part has a mating surface. When the valve element is in a closed state, the annular seat ring is attached to the mating surface of the support part, so that the valve plate body completely blocks the exhaust passage to form a sealed connection;

[0011] The valve body has two opposite side walls, the air guide part has a square profile, the two side edges of the air guide part are gap-fitted with the two side walls, and when the valve element is in an open state, an outlet of the exhaust channel is formed between the two side walls, the valve plate part, and the air guide part.

[0012] In the above technical solution of the present invention, the valve element forms a structure of outer square and inner circle, wherein the circular part is the valve plate part, which has an annular seat ring and a valve plate body, the valve plate body is used to cover the exhaust channel and isolate the exhaust channel, and the annular seat ring is located on the outer periphery of the valve plate body, and is used to cooperate with the supporting part in the exhaust channel to form a seal;

[0013] Specifically, in order to improve the strength of the valve plate body, a reinforced die-casting structure in the shape of inner and outer circles is provided on the valve plate body; further, the center of the valve plate body is recessed away from the supporting part, and accordingly, the central area of ​​the valve plate body can also be set as a curved surface structure.

[0014] In the fire check valve, in order to achieve smooth smoke and gas exhaust, it is necessary to set a guide structure at the part of the fire check valve extending into the exhaust duct. The main purpose of the two side walls in the present invention is to prevent the exhausted gas from diffusing laterally but mainly discharging directly upward; however, the valve plate in the prior art, such as the valve plate structure provided in Chinese Patent 2016106548305, adopts a structure with a circular outer contour, which only covers the valve seat (supporting part), and there is a large gap space between it and the guide structure. When the valve plate is opened, part of the exhausted gas is directly blown onto the valve, and the other part will diffuse to the surroundings, and even diffuse to the rear and lower side of the valve plate along the periphery of the valve plate, forming a vortex phenomenon between the valve plate and the side wall, which is not conducive to the rapid discharge of the gas. The gas diffused to the rear and lower side of the valve plate will also cause the opening position of the valve plate to be unstable, resulting in the valve plate shaking, the valve plate opening reduction and other phenomena.

[0015] The valve element of the present invention is provided with an air guide part outside the valve plate body. The air guide part has a square outline, and the gap between the air guide part and the two side walls is matched. The gap between the two is small, and there is almost no gas infiltration, that is, the gas cannot or will not diffuse to the lower rear side of the valve plate body, and will not form a vortex between the two side walls. After the exhausted gas discharges the valve plate body, it is discharged directly upwards under the joint guidance of the valve plate body and the air guide part.

[0016] The annular seat ring in the valve element of the present invention can achieve good sealing. A matching surface matching the annular seat ring is provided on the support portion. When the valve element is closed, the annular seat ring is attached to the matching surface of the support portion, and the two are in surface-to-surface contact, so that the valve plate body completely blocks the exhaust channel to form a sealed connection, thereby avoiding smoke and odor contamination.

[0017] Preferably, the surface-to-surface contact between the matching surface of the annular seat ring and the supporting portion is an arc surface contact.

[0018] According to another specific embodiment of the present invention, the valve plate portion is located between the annular seat ring and the valve plate body and is provided with an air dispersing inclined surface or an air inducing arc surface, so as to quickly drain the gas blown to the valve plate body.

[0019] According to another specific embodiment of the present invention, the valve body is provided with a valve shaft, and the valve shaft is located at the flow outlet of the exhaust channel. In the height direction, the valve shaft is always located below the valve element. For example, a connecting seat is provided on the rear side of the valve plate body, and the valve element is connected to the valve shaft through the connecting seat so as to rotate around the valve shaft.

[0020] Among them, the valve shaft is located below the valve element, which is conducive to increasing the opening angle of the valve element. Under the condition of the same exhaust gas speed, a larger opening angle can be obtained to quickly discharge the gas; at the same time, the valve shaft is not arranged on the gas discharge path, which can realize the full opening of the valve plate and reduce the resistance to the exhaust gas.

[0021] According to another specific embodiment of the present invention, a hole group for use with each other may be provided on the two side walls, and the holes in the hole group may be provided with, for example, rubber columns. By changing the position of the rubber columns in the hole group, the maximum opening angle position of the valve element can be changed.

[0022] According to another specific embodiment of the present invention, the valve element is inclined from top to bottom toward the inlet of the exhaust channel, and the maximum inclination angle of the valve element is 15°, for example, the inclination angle of the valve element is 10°; in the fire check valve in the prior art, the valve element (valve plate) has a larger inclination angle, and some inclination angles are above 30°. The main purpose is to enhance the sealing of the valve element and enhance the tendency of the valve element to rebound to the closed valve state, so as to save the service life of the reset elastic element (spring); however, after setting a larger inclination angle, there will be problems such as a small opening angle of the valve element, increased opening resistance, a small outflow port of the exhaust channel and a short life of the reset element, which is not conducive to the smoke exhaust process and is prone to smoke exhaust blockage during use.

[0023] Correspondingly, the present invention is also provided with a force-applying portion for pulling the valve element toward the valve closing position, the force-applying portion includes a flip link, a balancing link and a link torsion spring, a first axis is provided on the inlet side of the valve body at the exhaust passage, the head end of the flip link is hinged to the valve body through the first axis, the link torsion spring is sleeved on the first axis and is arranged to be pressed by the flip link; the end of the flip link and the head end of the balancing link are hinged to each other, and the end of the balancing link is hinged to the valve element.

[0024] Wherein, when the valve element is in the valve closing position, the end of the flip connecting rod is preferably located on the side of the first axis away from the valve element, at which time the center of gravity of the flip connecting rod and the balancing connecting rod is located on the side of the first axis away from the valve element, and the flip connecting rod and the balancing connecting rod provide a gravity closing effect for the closing of the valve element, so as to further improve the sealing performance of the closing of the valve element;

[0025] Furthermore, when the valve element is in the open state, the end of the flip connecting rod is located on the side of the first axis close to the valve element, and the center of the flip connecting rod and the balancing connecting rod is located on the side of the first axis close to the valve element; the flip connecting rod and the balancing connecting rod will provide a gravity opening effect for the opening of the valve element, so as to further increase the opening range of the valve element, so that it is in the maximum opening position, thereby quickly exhausting smoke and exhaust.

[0026] In the present invention, the effect of gravity-driven tendencies in different directions when the flip connecting rod and the supporting connecting rod are in different positions is utilized, and a valve element with a smaller inclination angle is cooperated to realize a smooth opening and closing process of the valve element. While significantly increasing the opening angle of the valve element, the resistance to the opening of the valve element is reduced, the sealing performance of the valve element in the closed state is improved, and the service life of the connecting rod torsion spring is also increased.

[0027] According to another specific embodiment of the present invention, the annular seat ring has a bearing surface perpendicular to the air guide part, and when the valve element is in a closed state, the bearing surface and the mating surface are perpendicular to each other. A sealing rubber ring is sleeved on the bearing surface, and the sealing rubber ring is at least partially attached to the mating surface; the sealing rubber ring is further improved by the sealing rubber ring.

[0028] According to another specific embodiment of the present invention, the edges around the air guide part are provided with a flange structure facing away from the supporting part, and the edges around the air guide part have a narrow contact plane that matches the gap between the two side walls. One of the purposes of such a setting is to limit the shaking of the valve element when the exhaust gas speed is high, and the flow rate of the exhaust gas acts more on the opening valve element to obtain a larger opening angle.

[0029] According to another specific embodiment of the present invention, in any position state of the valve element, the lower edge of the air guide part is arranged to always be located below the mating surface of the supporting part, and the exhausted gas will be blown directly onto the valve element instead of being blown from the bottom of the valve element into the guide structure.

[0030] In order to achieve the complete air guiding effect of the valve element of the present invention, as an extension of the present invention, a lower sealing plate is arranged below the flow outlet of the valve body in the exhaust channel, and the lower sealing plate is respectively connected to the two side walls. In any position state of the valve element, there is an overlapping area between the projection of the valve element on the horizontal plane and the projection of the lower sealing plate on the horizontal plane.

[0031] In this solution, the lower sealing plate limits the upward flow of gas in the exhaust duct and will not affect the gas discharged from the exhaust channel in the valve body. That is, when the valve element is in the open exhaust state, the gas in the exhaust duct will not affect the gas being discharged by the fire check valve.

[0032] According to another specific embodiment of the present invention, an upper sealing plate is arranged above the flow outlet of the valve body in the exhaust channel, and the upper sealing plate is respectively connected to the two side walls. When the valve element is in a closed state, the upper sealing plate is arranged to cover the upper edge of the air guide part and not exceed the lower edge of the air guide part.

[0033] The main purpose of the upper sealing plate is to prevent debris in the exhaust duct from falling onto the valve body, especially to prevent it from falling onto the valve element, so as to avoid the problem of regular cleaning caused by debris falling on the fireproof check valve of the present invention during long-term use.

[0034] According to another specific embodiment of the present invention, the valve body further has a vertical connecting plate located on a side of the side wall away from the supporting portion, the vertical connecting plate being connected to the two side walls respectively, wherein the upper end edge of the vertical connecting plate is arranged to exceed the upper sealing plate.

[0035] Specifically, the two side walls are both vertically arranged, which can reduce the resistance of the main airflow in the exhaust duct to the upward flow. The lower sealing plate and the vertical connecting plate are not connected, and a large gap is formed between the two. When the valve element is not opened, the rising airflow in the exhaust duct can flow upward from the aforementioned gap with almost no resistance.

[0036] The upper edge of the vertical connecting plate is set to extend beyond the upper sealing plate, that is, the upper edge of the vertical connecting plate extends beyond the upper end of the valve element, and the lower edge of the vertical connecting plate is lower than the upper sealing plate, but there is a large distance between it and the lower sealing plate. The purpose of this setting is that the gas flowing out along the valve element flows to the vertical connecting plate in an oblique upward posture, and then flows out vertically upward under the action of the vertical connecting plate, so as to avoid affecting the flow of the main airflow in the exhaust duct.

[0037] The present invention has the following beneficial effects:

[0038] The present invention has a good flow guiding effect, and is provided with a valve element with a square outer surface and a round inner surface. The air guiding part in the valve element has a square profile, which is matched with the clearance between the two side walls to reduce the resistance of gas discharge, and can avoid the vortex phenomenon generated by the exhaust gas at the outlet of the exhaust channel to the greatest extent;

[0039] The valve element of the present invention has a large opening angle, and the valve shaft is located at the rear and lower part of the valve element, which reduces the resistance of gas discharge and is conducive to the rapid discharge of gas;

[0040] The valve element of the present invention has a better sealing effect. Through the surface-to-surface sealing method between the annular seat ring with an outward protrusion and the matching surface in the support part, and the sealing method between the annular seat ring and the matching surface, the smoke and odor cross-talk phenomenon is effectively avoided. Especially after the fire protection element is triggered, the cooperation between the valve element and the support part is more stable and the sealing effect is good.

[0041] The present invention can achieve complete air guidance, and is provided with a lower sealing plate and a vertical connecting plate, thereby avoiding the influence of the main airflow in the exhaust duct on the exhaust gas of the fire check valve, and the exhausted gas flows out vertically upward, making the main airflow in the exhaust duct flow more stable.

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the fire-proof check valve of the present invention;

[0044] Figure 2 is a cross-sectional schematic diagram of a fire check valve, which shows the valve element in the normal closed position;

[0045] Figure 3 It is a schematic diagram of the structure of the valve element of the present invention;

[0046] Figure 4 yes Figure 3 A quarter section diagram of

[0047] Figure 5 It is a structural schematic diagram of the support part of the present invention;

[0048] Figure 6 The invention discloses a schematic structural diagram of an upper sealing plate and a lower sealing plate of a fireproof check valve.

[0049] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “horizontal” and “vertical” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention. They do not indicate or imply that the device or feature referred to must have a specific direction, be constructed and operated in a specific orientation. For those skilled in the art, the above terms should be understood in a broad sense and therefore should not be understood as limitations on the present invention. DETAILED DESCRIPTION

[0050] like Figure 1 As shown in Figure 6, a fire check valve comprises a valve body 1, a valve element 2 and a supporting portion 3; an exhaust passage 11 is arranged in the valve body 1, the exhaust passage 11 has an inlet 111 and an outlet 112, the supporting portion 3 is formed in the valve body 1 and is located in the exhaust passage 11, and is located between the inlet 111 and the outlet 112; a valve shaft 12 is arranged on the valve body 1, and the valve element 2 performs an opening and closing movement around the valve shaft 12 to open or close the exhaust passage 11.

[0051] The supporting portion 3 includes a cylindrical valve seat 31 and a matching surface 32 formed at one end of the valve seat 31;

[0052] The valve element 2 includes a valve plate portion 21 and an air guide portion 22, wherein the valve plate portion 21 is used to close the exhaust passage 11, and a sealing connection can be formed between the valve plate portion 21 and the mating surface 32, and the air guide portion 22 is located at the periphery of the valve plate portion 21, and is used for the gas discharged from the outlet 112 of the exhaust passage 11 to flow out;

[0053] The valve plate part 21 includes an annular seat ring 211 and a valve plate body 212. The outer contour of the valve plate body 212 is circular and adapted to the valve seat 31. The annular seat ring 211 protrudes toward the inlet 111 of the exhaust passage 11 in the circumferential direction of the valve plate body 212. Preferably, a wind dispersion inclined surface 213 is provided between the annular seat ring 211 and the valve plate body 212 to quickly drain and discharge the gas blown to the valve plate body 212.

[0054] Specifically, in order to improve the strength of the valve plate body 212, a reinforced die-cast structure in the shape of an inner and outer ring can be provided on the valve plate body 212; further, the center of the valve plate body 212 is recessed away from the support portion 3, and when the valve element 2 is in a closed state, the annular seat ring 211 is attached to the mating surface 32, so that the valve plate body 212 completely blocks the exhaust channel 11 to form a sealed connection.

[0055] The annular seat ring 211 is provided with a bearing surface 214 which is perpendicular to the air guide portion 22, and a sealing ring 215 is sleeved on the bearing surface 214. When the valve element 2 is in a closed state, the bearing surface 214 and the mating surface 32 are perpendicular to each other, and the sealing rubber ring 215 is completely fitted to the mating surface 32, so as to further improve the sealing performance between the valve element 2 and the supporting portion 3.

[0056] Among them, a shape of the sealing rubber ring 215 is as follows Figure 4 The cross section shown in FIG. 1 is L-shaped, having a long side that can be closely attached to the mating surface 32 to increase the sealing performance when the valve element 2 is in the closed state.

[0057] The outer contour of the air guide part 22 is a square contour. Two opposite side walls 13 are arranged on the valve body 1. The two side edges of the air guide part 22 are gap-fitted with the two side walls 13. When the valve element 2 is in the open state, the two side walls 13 and the valve plate part 21 and the air guide part 22 form an outlet 112 of the exhaust channel 11.

[0058] Furthermore, the edges around the air guide part 22 are provided with a flange structure 221 facing away from the supporting part 3. The edges around the air guide part 22 have a narrow contact plane that fits with the gap between the two side walls 13, thereby preventing the valve element 2 from shaking between the two side walls 13 and improving the smoothness of opening the valve element 2.

[0059] In a preferred example of the present invention, a connection seat 23 is provided at the rear side of the valve element 2 , and the valve element 2 is connected to the valve shaft 12 via the connection seat 23 , wherein the valve shaft 12 is always located below the valve element 2 .

[0060] In order to facilitate the opening or closing process of the valve element 2, a preferred structure of the valve element 2 is set as follows:

[0061] The valve element 2 is arranged to be inclined from top to bottom toward the inlet 111 of the exhaust passage 11. Figure 2In the case where the inclination angle is 10°, a force-applying portion 4 is provided on the valve body 1, and the force-applying portion 4 includes a flip link 41 and a balancing link 42, which are used to pull the valve element 2 toward the valve closing position; a double rocker structure is formed between the flip link 41, the balancing link 42 and the valve element 2. Specifically, a first axis 14 parallel to the valve shaft 12 is provided at the inlet 111 of the exhaust channel 11 of the valve body 1, the head end of the flip link 41 is hinged to the valve body 1 through the first axis 14, the end of the flip link 41 and the head end of the balancing link 42 are hinged to each other, and a connecting piece 24 is provided at the center of the side of the valve element 2 facing the inlet 111 of the exhaust channel 11, the connecting piece 24 has a hinged end, and the end of the balancing link 42 is hinged to the hinged end of the connecting piece 24, thereby forming a double rocker structure with the first axis 14 and the valve shaft 12 as a frame, the flip link 41 and the valve element 2 as rockers, and the balancing link 42 as a connecting rod.

[0062] In order to facilitate the automatic closing of the valve element 2, one of the rockers is selected to apply the automatic reset force. In a preferred example of the present invention, the force applying part 4 can also be a connecting rod torsion spring 43, which is sleeved on the first shaft 14 and is configured to be pressed by the flip connecting rod 41;

[0063] When smoke and gas need to be exhausted, an airflow with a certain rate blows the valve element 2 open and further compresses the connecting rod torsion spring 43. When the gas is completely exhausted, the valve element 2 is reset to the closed position under the action of the connecting rod torsion spring 43.

[0064] In other preferred examples of the present invention, the auxiliary driving force during the opening or closing process of the valve element 2 can be provided by designing the length and action position of the flip link 41 and the balance link 42, specifically:

[0065] When the valve element 2 is in the valve closing position, the end of the flip link 41 is preferably located on the side of the first axis 14 away from the valve element 2. At this time, the center of gravity of the flip link 41 and the balancing link 42 are located on the side of the first axis 14 away from the valve element 2, and the flip link 41 and the balancing link 42 provide a gravity closing effect for the closing of the valve element 2.

[0066] When the valve element 2 is in the open state, the end of the flip link 41 is located on the side of the first axis 14 close to the valve element 2. At this time, the centers of the flip link 41 and the balance link 42 are located on the side of the first axis 14 close to the valve element 2; the flip link 41 and the balance link 42 provide a gravity opening effect for the opening of the valve element 2.

[0067] Furthermore, in order to make the gravity closing effect more obvious, the flip connecting rod 41 preferably has a curved portion, such as Figure 2As shown; this design can greatly improve the smoothness of the opening or closing process of the valve element 2, so that the valve element 2 has a larger opening angle and a stronger sealing performance in the closed position.

[0068] In order to achieve the complete air guiding effect of the valve element 2 of the present invention, in another preferred example of the present invention, a lower sealing plate 15 is provided on the valve body 1 below the flow outlet 112 of the exhaust channel 11, and the lower sealing plate 15 is respectively connected to the two side walls 13. In any position state of the valve element 2, there is an overlapping area between the projection of the valve element 2 on the horizontal plane and the projection of the lower sealing plate 15 on the horizontal plane, so as to limit the gas in the exhaust channel from flowing upward to the flow outlet 112 of the exhaust channel 11.

[0069] The valve shaft 12 is preferably installed on the lower sealing plate 15 .

[0070] Furthermore, an upper sealing plate 16 is provided on the valve body 1 above the outflow port 112 of the exhaust passage 11, and the upper sealing plate 16 is respectively connected to the two side walls 13. When the valve element 2 is in a closed state, the upper sealing plate 16 is configured to cover the upper edge of the air guide portion 22 and not exceed the lower edge of the air guide portion 22 to prevent debris in the exhaust passage from falling onto the valve element 2.

[0071] Among them, matching hole groups are arranged on the two side walls 13, and the maximum opening position of the control valve element 2 is realized by arranging, for example, a rubber plug or a stud in a specific space in the hole group. Especially in the exhaust duct of high-rise buildings, the opening of the fire check valve in the bottom section is greater than the opening of the fire check valve in the top section. The openings of multiple fire check valves decrease from bottom to top, which can well adjust the wind resistance of smoke exhaust on the upper and lower floors and achieve a balanced smoke exhaust volume on the upper and lower floors.

[0072] Furthermore, the valve body 1 also has a vertical connecting plate 17, see Figure 2 The vertical connecting plate 17 is located on the side of the side wall 13 away from the supporting portion 3, and the vertical connecting plate 17 is respectively connected to the two side walls 13, wherein the upper end edge of the vertical connecting plate 17 is set to exceed the upper sealing plate 16, and the gas flowing out along the valve element 2 flows to the vertical connecting plate 17 in an oblique upward posture, and then flows out vertically upward under the action of the vertical connecting plate 17, avoiding affecting the flow of the main airflow in the exhaust duct.

[0073] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art can make some improvements without departing from the scope of the present invention, that is, all equivalent improvements made according to the present invention should be covered by the scope of the present invention.

Claims

1. A fireproof check valve, comprising a valve body, a valve element, a support portion and a force-applying portion, wherein an exhaust passage is arranged in the valve body, the support portion is formed in the valve body and is located in the exhaust passage, the valve element is openably arranged on the valve body and cooperates with the support portion to open or close the exhaust passage, and is characterized in that: The valve element comprises a valve plate portion for closing the exhaust passage and an air guide portion arranged at the periphery of the valve plate portion; The valve plate part is provided with an annular seat ring protruding toward the inlet of the exhaust passage and a valve plate body located inside the annular seat ring, and the outer contour of the valve plate body is circular; the support part has a mating surface, and the valve element is in a closed state, and the annular seat ring is attached to the mating surface of the support part, so that the valve plate body completely blocks the exhaust passage to form a sealed connection; wherein the annular seat ring has a bearing surface perpendicular to the air guide part, and the valve element is in a closed state, and the bearing surface and the mating surface are perpendicular to each other, and a sealing rubber ring is sleeved on the bearing surface, and the sealing rubber ring is at least partially attached to the mating surface; the cross-sectional shape of the sealing rubber ring is L-shaped, and it has a long side that can be tightly attached to the mating surface; The valve body has two opposite side walls, the air guide portion has a square profile, the two side edges of the air guide portion are gap-matched with the two side walls, and when the valve element is in an open state, the two side walls, the valve plate portion, and the air guide portion form an outlet of the exhaust channel; The edges of the wind guide portion are provided with flange structures facing away from the support portion; The force-applying part is used to pull the valve element toward the valve-closing position, and includes a flip connecting rod and a balancing connecting rod. A double rocker structure is formed between the flip connecting rod, the balancing connecting rod and the valve element.

2. The fire check valve according to claim 1, characterized in that: The valve plate portion is located between the annular seat ring and the valve plate body and is provided with an air dispersing and inducing inclined surface or an air inducing arc surface.

3. The fire check valve according to claim 1, characterized in that: The valve body is provided with a valve shaft, and the valve shaft is located at the outflow port of the exhaust passage. In the height direction, the valve shaft is always located below the valve element.

4. The fire check valve according to claim 1, characterized in that: The valve element is arranged to be inclined from top to bottom toward the inlet of the exhaust passage, and the maximum inclination angle of the valve element is 15°.

5. The fire-proof check valve according to any one of claims 1 to 4, characterized in that: A lower sealing plate is arranged below the outlet of the exhaust passage of the valve body, and the lower sealing plate is respectively connected to the two side walls. In any position state of the valve element, there is an overlapping area between the projection of the valve element on the horizontal plane and the projection of the lower sealing plate on the horizontal plane.

6. The fire check valve according to claim 5, characterized in that: An upper sealing plate is arranged above the outlet of the exhaust passage of the valve body, and the upper sealing plate is respectively connected to the two side walls. When the valve element is in a closed state, the upper sealing plate is arranged to cover the upper edge of the air guide part and not exceed the lower edge of the air guide part.

7. The fire check valve according to claim 6, characterized in that: The valve body further comprises a vertical connecting plate, which is located at a side of the side wall away from the supporting portion, and the vertical connecting plate is respectively connected to the two side walls, wherein the upper end edge of the vertical connecting plate is arranged to exceed the upper sealing plate.

8. The fire check valve according to claim 1, characterized in that: In any position state of the valve element, the lower edge of the air guide portion is arranged to always be located below the mating surface of the support portion.

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