Locking mechanism for butterfly fireproof check valve

Abstract

The utility model discloses a locking mechanism of butterfly type fireproof check valve, including respectively be used for locking the first valve piece and second valve piece of first valve piece and second valve piece of first shift lever and second shift lever and be used for sensing the first temperature sensing mechanism of flue gas temperature, first temperature sensing mechanism is connected with first shift lever to trigger the action of first shift lever locking first valve piece when flue gas temperature is greater than or equal to first setting temperature, and first shift lever is connected with second shift lever through coupling mechanism to trigger the action of second shift lever locking second valve piece when first shift lever locks first valve piece. The locking mechanism of the utility model can lock two valve pieces of butterfly type fireproof check valve in time effectively synchronously after the fire occurs, and has higher sensitivity to the temperature rise caused by the fire, can prevent the spread of fire in time effectively.

Description

Technical Field

[0001] This utility model relates to the field of fire safety, and in particular to a locking mechanism for a butterfly fireproof check valve. Background Technology

[0002] Fire-resistant backflow preventers are typically installed at the air inlet of exhaust ducts, connected to range hoods or exhaust fans. They prevent backflow of gas within the duct and close in the event of a fire to stop its spread. A locking mechanism is installed on the fire-resistant backflow preventer and connects to a temperature-sensing element. When the temperature-sensing element detects that the temperature rise caused by a fire reaches or exceeds a set threshold, it activates the locking mechanism to close the fire-resistant backflow preventer, thus preventing the fire from spreading.

[0003] Butterfly-type fireproof check valves employ two valve discs resembling butterfly wings. Compared to conventional fireproof check valves using a single valve disc, they offer advantages such as smaller overall size, quick and reliable opening and closing, and lower air resistance. However, existing technologies still present some problems with the locking mechanism of butterfly-type fireproof check valves. For example, the temperature sensing element may react slowly to temperature rises caused by a fire, and the separate control of the two valve discs by different temperature sensing elements may lead to the two valve discs not locking synchronously.

[0004] Therefore, improvements to the locking mechanism for butterfly fireproof check valves are still needed to address the aforementioned issues. Summary of the Invention

[0005] To solve the aforementioned technical problems, the inventors, through creative labor, proposed the following locking mechanism for butterfly fireproof check valves. Specifically, this utility model provides the following technical solution.

[0006] In one aspect, the present invention provides a locking mechanism for a butterfly fireproof check valve, comprising a first lever and a second lever for locking a first valve plate and a second valve plate of the butterfly fireproof check valve, respectively, and a first temperature sensing mechanism for sensing the flue gas temperature, wherein the first temperature sensing mechanism is connected to the first lever to trigger the first lever to lock the first valve plate when the flue gas temperature is greater than or equal to a first set temperature, and the first lever is connected to the second lever through a coupling mechanism to trigger the second lever to lock the second valve plate when the first lever locks the first valve plate.

[0007] Furthermore, the proximal ends of the first lever and the second lever are rotatably connected to the valve body of the butterfly fireproof check valve, and the first lever and the second lever are respectively provided with a first elastic element and a second elastic element; the first elastic element is used to drive the first lever to rotate so that its distal end abuts against the first valve plate to lock the first valve plate, and the second elastic element is used to drive the second lever to rotate so that its distal end abuts against the second valve plate to lock the second valve plate.

[0008] Furthermore, the coupling mechanism includes a first protrusion on the first lever and a second protrusion on the second lever. When the locking mechanism is in a first state that allows the first valve plate and the second valve plate to open and close freely, the first protrusion abuts against the second protrusion to prevent the second lever from rotating. When the action of locking the first valve plate is triggered by the first lever, the first lever drives the first protrusion away from the second protrusion, thereby allowing the second lever to rotate to trigger the action of locking the second valve plate, so that the locking mechanism enters a second state of locking the first valve plate and the second valve plate.

[0009] Furthermore, the first convex portion and the second convex portion are a pair of single-tooth or multi-tooth gears capable of meshing with each other.

[0010] Furthermore, the first temperature sensing mechanism is a first hot melt sheet, which includes a free end and a fixed end fixedly connected by a heat-sensitive material. The fixed end of the first hot melt sheet is fixedly connected to the valve body. When the locking mechanism is in the first state, the free end of the first hot melt sheet abuts against the distal end of the first lever to prevent the first lever from rotating. When the flue gas temperature is greater than or equal to the first set temperature, the heat-sensitive material melts, causing the free end of the first hot melt sheet to separate from the fixed end and no longer abut against the distal end of the first lever, thereby allowing the first lever to rotate and triggering the first lever to lock the first valve plate.

[0011] Furthermore, the first temperature sensing mechanism is positioned away from the valve seat of the butterfly fireproof check valve to extend further into the smoke.

[0012] Furthermore, the free end of the first hot melt sheet is provided with an extension, and when the locking mechanism is in the first state, the free end of the first hot melt sheet abuts against the far end of the first lever through the extension to prevent the first lever from rotating.

[0013] Furthermore, the first temperature sensing mechanism is located downstream of the butterfly fireproof check valve, and the locking mechanism also includes a second temperature sensing mechanism located upstream of the butterfly fireproof check valve, wherein the first temperature sensing mechanism and the second temperature sensing mechanism are connected in series, and the second temperature sensing mechanism triggers the first lever to lock the first valve plate when the flue gas temperature is greater than or equal to the second set temperature.

[0014] Furthermore, the first temperature sensing mechanism is fixed to the valve body of the butterfly fireproof check valve through the second temperature sensing mechanism.

[0015] Furthermore, the second temperature-sensing mechanism is a second heat-fused sheet, which includes a free end and a fixed end fixedly connected by a heat-sensitive material. The fixed end of the second heat-fused sheet is fixedly connected to the valve body, and the free end of the second heat-fused sheet is fixedly connected to the fixed end of the first temperature-sensing mechanism by a connecting rod. The connecting rod is rotatably connected to the valve body. When the locking mechanism is in the first state, the second heat-fused sheet prevents the first lever from rotating through the first heat-fused sheet fixedly connected to it. When the flue gas temperature is greater than or equal to the second set temperature, the heat-sensitive material melts, causing the free end and fixed end of the second heat-fused sheet to separate. The first heat-fused sheet no longer prevents the first lever from rotating, thereby allowing the first lever to rotate and triggering the first lever to lock the first valve plate.

[0016] Furthermore, the first set temperature and the second set temperature can each independently be, for example, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 250, 300, 350 degrees Celsius or higher.

[0017] Compared with the prior art, the present invention has at least the following beneficial technical effects: The locking mechanism of this utility model for a butterfly fireproof check valve can promptly and effectively lock the two valve plates (i.e., the first valve plate and the second valve plate) of the butterfly fireproof check valve simultaneously after a fire occurs. Furthermore, the temperature sensing mechanism of the locking mechanism can extend further into the downstream or upstream smoke, thereby effectively avoiding interference from other components on the heat-fused plate's sensing of smoke temperature, improving its sensitivity to temperature rise caused by fire, and ensuring that the butterfly fireproof check valve can promptly and effectively prevent the spread of fire.

[0018] In the description of this utility model, "substantially" does not exclude the meaning of "completely". For example, if a component is "substantially free" of Y, it can also mean that it contains no Y at all. If necessary, "substantially" can be removed from the definition of this utility model. "Contains" includes both the mentioned factor and may include additional, indeterminate factors. "Approximately", "about", and in the case of indicating the concentration system of each component, refer to the standard value of + / - 5%, + / - 4%, + / - 3%, + / - 2%, + / - 1%, + / - 0.5%. "And / or" indicates that the multiple terms connected thereto can each be used individually or in any combination of them.

[0019] In this invention, examples are generally described using a range, merely for the purpose of concise and clear explanation, and not as a limitation of the invention. The described range includes sub-ranges, as well as all individual values ​​within that range. For example, the range 1 to 6 includes sub-ranges such as 1 to 3, 1 to 4, 1 to 5, 2 to 4, 2 to 6, 3 to 6, etc., and also includes individual values ​​within that range, such as 1, 2, 3, 4, 5, and 6.

[0020] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of a combination of a locking mechanism and a butterfly fireproof check valve according to the present invention. Figure 2 yes Figure 1 A schematic diagram of the locking mechanism in the combination shown; Figure 3 yes Figure 2 Top view of the locking mechanism shown; In the picture: 11-First lever, 12-Second lever, 13-First spring, 14-Second spring, 15-First baffle, 16-Second baffle, 17-First protrusion, 18-Second protrusion, 19-Mounting bracket, 21-First hot melt sheet, 22-Second hot melt sheet, 23-Extension, 25-Connecting rod, 31-First valve plate, 32-Second valve plate, 41-Valve body, 411-Center beam. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] refer to Figure 1-3According to the present invention, a locking mechanism for a butterfly fireproof check valve is provided. The butterfly fireproof check valve includes a valve body 41, a central beam 411 fixedly connected to the valve body 41 and dividing the channel of the valve body 41 into a left channel and a right channel, and a first valve plate 31 for opening and closing the left channel downstream of the fireproof check valve and a second valve plate 32 for opening and closing the right channel downstream of the fireproof check valve, which are rotatably connected to both sides of the central beam 411 respectively. The locking mechanism includes a mounting bracket 19 for fixing it to the valve body 41, a first lever 11 and a second lever 12 rotatably connected to the mounting bracket 19 respectively, a first spring 13 installed at the proximal shaft of the first lever 11 for driving the first lever 11 to rotate clockwise, and a locking mechanism for fixing the first lever 11 to the valve body 41. The first lever 11 and the second lever 12 are respectively equipped with a second spring 14 for driving the second lever 12 to rotate counterclockwise at the proximal pivot of the second lever 12, a first baffle 15 and a second baffle 16 for limiting the rotational position limits of the first lever 11 and the second lever 12, and a first hot melt sheet 21 fixed to the middle beam 411 and located downstream of the fireproof check valve. The proximal ends of the first lever 11 and the second lever 12 are respectively provided with a first protrusion 17 and a second protrusion 18 that cooperate with each other. The first hot melt sheet 21 includes a free end and a fixed end, which are connected by a heat-sensitive material (e.g., a heat-sensitive alloy that is melted at a set temperature so that the free end and the fixed end can be separated from each other). The free end of the first hot melt sheet 21 is provided with an extension 23.

[0024] When the locking mechanism is in the first state that allows the first valve plate 31 and the second valve plate 32 to open and close freely, the extension 23 fixed to the free end of the first hot melt sheet 21 abuts against the far end of the first lever 11 away from its axis of rotation, thus preventing the first lever 11 from rotating clockwise above the first valve plate 31 so as to allow the first valve plate 31 to open and close freely; at the same time, the first protrusion 17 at the proximal end of the first lever 11 abuts against the second protrusion 18 at the proximal end of the second lever 12, thus preventing the second lever 12 from rotating counterclockwise above the second valve plate 32 so as to allow the second valve plate 32 to open and close freely.

[0025] When a fire occurs downstream of the fireproof check valve, the heat-sensitive material of the first hot melt sheet 21 melts upon reaching the set temperature, causing its free end and fixed end to separate. This causes the extension 23 to disengage from the first lever 11. Driven by the first spring 13, the first lever 11 rotates clockwise to its maximum rotational position defined by the first baffle 15. The distal end of the first lever 11 abuts against the upper side of the first valve plate 31, causing the first valve plate 31 to close the left side passage of the valve body 41. Simultaneously, as the first lever 11 rotates clockwise, the first protrusion 17 releases... (No longer against) the second protrusion 18, thereby the second lever 12 rotates counterclockwise under the drive of the second spring 14 to the rotational position limit defined by the second stop plate 16. The distal end of the second lever 12 abuts against the upper side of the second valve plate 32, causing the second valve plate 32 to close the right side channel of the valve body 41. Correspondingly, at this time the locking mechanism is in the second state of locking the first valve plate 31 and the second valve plate 32, effectively preventing the high-temperature smoke downstream of the fireproof check valve from entering the upstream through the fireproof check valve when a fire occurs, thus avoiding the spread of the fire.

[0026] In some cases, the locking mechanism further includes a second heat-fused sheet 22 located upstream of the fireproof check valve. The second heat-fused sheet 22 includes a free end and a fixed end, which are connected by a heat-sensitive material (e.g., a heat-sensitive alloy that melts at a set temperature to separate the free end and the fixed end). The fixed end of the first heat-fused sheet 21 is fixedly connected to one end of a connecting rod 25 rotatably connected to the central beam 411. The other end of the connecting rod 25 passes through the central beam 411 and is connected to the free end of the second heat-fused sheet 22. The fixed end of the second heat-fused sheet 22 is fixedly connected to the central beam 411.

[0027] When the locking mechanism is in the first state that allows the first valve plate 31 and the second valve plate 32 to open and close freely, the second hot melt sheet 22 prevents the first hot melt sheet 21 from rotating through the connecting rod 25. The extension 23 fixed to the free end of the first hot melt sheet 21 abuts against the far end of the first lever 11 away from its axis of rotation, thus preventing the first lever 11 from rotating clockwise to above the first valve plate 31 so as to allow the first valve plate 31 to open and close freely. At the same time, the first protrusion 17 at the proximal end of the first lever 11 abuts against the second protrusion 18 at the proximal end of the second lever 12, thus preventing the second lever 12 from rotating counterclockwise to above the second valve plate 32 so as to allow the second valve plate 32 to open and close freely.

[0028] When a fire occurs upstream of the fireproof check valve, the heat-sensitive material of the second hot melt sheet 22 melts upon reaching a set temperature, causing its free end and fixed end to separate. This allows the connecting rod 25 to rotate, causing the extension 23 of the free end of the first hot melt sheet 21 to disengage from the first lever 11. Driven by the first spring 13, the first lever 11 rotates clockwise to the rotational limit defined by the first baffle 15. The distal end of the first lever 11 abuts against the upper side of the first valve plate 31, causing the first valve plate 31 to close the left passage of the valve body 41. Simultaneously, as the first lever 11 rotates clockwise... When activated, the first protrusion 17 releases (no longer abuts against) the second protrusion 18, thereby causing the second lever 12 to rotate counterclockwise under the drive of the second spring 14 to the rotational position limit defined by the second stop plate 16. The distal end of the second lever 12 abuts against the upper side of the second valve plate 32, causing the second valve plate 32 to close the right side passage of the valve body 41. Correspondingly, the locking mechanism is in the second state of locking the first valve plate 31 and the second valve plate 32, effectively preventing the high-temperature smoke upstream of the fireproof check valve from entering the downstream through the fireproof check valve when a fire occurs, thus avoiding the spread of the fire.

[0029] In the locking mechanism of this utility model, when in the first state, the first protrusion 17 abuts against the second protrusion 18, causing the first lever 11 and the second lever 12 to be interconnected. That is, the rotation of the second lever 12 is restricted by restricting the rotation of the first lever 11. Therefore, when a fire occurs, after the first fusible link 21 or the second fusible link 22 melts and releases the first lever 11, the second lever 12 will be released immediately, causing the locking mechanism to change from the first state to the second state. This achieves the synchronous locking of the first valve plate 31 and the second valve plate 32 of the butterfly fireproof check valve, ensuring that the butterfly fireproof check valve can effectively prevent the spread of fire.

[0030] Furthermore, in the locking mechanism of this utility model, by employing the extension 23 and the connecting rod 25, the first hot melt sheet 21 and the second hot melt sheet 22 can be kept away from the locking mechanism such as the middle beam 411 and other components of the butterfly fireproof check valve, and can extend further into the downstream or upstream smoke. This effectively avoids interference from these components with the hot melt sheet's sensing of smoke temperature, improves its sensitivity to temperature rise caused by fire, and ensures the timely response of the butterfly fireproof check valve to fire.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and not restrictive in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description, and any reference numerals in the claims should not be construed as limiting the scope of the claims, and all variations falling within the meaning of equivalents of the claims are covered within the scope of this invention.

Claims

1. A locking mechanism for a butterfly fireproof check valve, comprising a first lever and a second lever for locking a first valve plate and a second valve plate of the butterfly fireproof check valve, respectively, and a first temperature sensing mechanism for sensing the temperature of smoke gas, characterized in that, The first temperature sensing mechanism is connected to the first lever so that when the flue gas temperature is greater than or equal to the first set temperature, the first lever is triggered to lock the first valve plate. The first lever is connected to the second lever through a coupling mechanism so that when the first lever locks the first valve plate, the second lever is triggered to lock the second valve plate.

2. The locking mechanism according to claim 1, characterized in that, The proximal ends of the first lever and the second lever are rotatably connected to the valve body of the butterfly fireproof check valve, and the first lever and the second lever are respectively provided with a first elastic element and a second elastic element; the first elastic element is used to drive the first lever to rotate so that its distal end abuts against the first valve plate to lock the first valve plate, and the second elastic element is used to drive the second lever to rotate so that its distal end abuts against the second valve plate to lock the second valve plate.

3. The locking mechanism according to claim 2, characterized in that, The coupling mechanism includes a first protrusion on a first lever and a second protrusion on a second lever. When the locking mechanism is in a first state that allows the first valve plate and the second valve plate to open and close freely, the first protrusion abuts against the second protrusion to prevent the second lever from rotating. When the action of locking the first valve plate is triggered by the first lever, the first lever drives the first protrusion away from the second protrusion, thereby allowing the second lever to rotate to trigger the action of locking the second valve plate, so that the locking mechanism enters a second state of locking the first valve plate and the second valve plate.

4. The locking mechanism according to claim 3, characterized in that, The first convex part and the second convex part are a pair of single-tooth or multi-tooth gears that can mesh with each other.

5. The locking mechanism according to claim 3, characterized in that, The first temperature sensing mechanism is a first hot melt sheet, which includes a free end and a fixed end fixedly connected by a heat-sensitive material. The fixed end of the first hot melt sheet is fixedly connected to the valve body. When the locking mechanism is in the first state, the free end of the first hot melt sheet abuts against the distal end of the first lever to prevent the first lever from rotating. When the flue gas temperature is greater than or equal to a first set temperature, the heat-sensitive material melts, causing the free end of the first hot melt sheet to separate from the fixed end and no longer abut against the distal end of the first lever, thereby allowing the first lever to rotate and triggering the first lever to lock the first valve plate.

6. The locking mechanism according to any one of claims 1-5, characterized in that, The first temperature sensing mechanism is positioned away from the valve seat of the butterfly fireproof check valve to extend further into the smoke.

7. The locking mechanism according to claim 5, characterized in that, The free end of the first hot melt sheet is provided with an extension, and when the locking mechanism is in the first state, the free end of the first hot melt sheet abuts against the far end of the first lever through the extension to prevent the first lever from rotating.

8. The locking mechanism according to any one of claims 1-5, characterized in that, The first temperature sensing mechanism is located downstream of the butterfly fireproof check valve, and the locking mechanism also includes a second temperature sensing mechanism located upstream of the butterfly fireproof check valve. The first temperature sensing mechanism and the second temperature sensing mechanism are connected in series. When the flue gas temperature is greater than or equal to a second set temperature, the second temperature sensing mechanism triggers the first lever through the first temperature sensing mechanism to lock the first valve plate.

9. The locking mechanism according to claim 8, characterized in that, The first temperature sensing mechanism is fixed to the valve body of the butterfly fireproof check valve through the second temperature sensing mechanism.

10. The locking mechanism according to claim 9, characterized in that, The second temperature-sensing mechanism is a second heat-fused sheet, which includes a free end and a fixed end fixedly connected by a heat-sensitive material. The fixed end of the second heat-fused sheet is fixedly connected to the valve body, and the free end of the second heat-fused sheet is fixedly connected to the fixed end of the first temperature-sensing mechanism by a connecting rod. The connecting rod is rotatably connected to the valve body. When the locking mechanism is in the first state, the second heat-fused sheet prevents the first lever from rotating by the first heat-fused sheet fixedly connected to it. When the flue gas temperature is greater than or equal to the second set temperature, the heat-sensitive material melts, causing the free end and fixed end of the second heat-fused sheet to separate. The first heat-fused sheet no longer prevents the first lever from rotating, thereby allowing the first lever to rotate and triggering the first lever to lock the first valve plate.

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