Butterfly fireproof check valve

Abstract

The utility model discloses a butterfly type fireproof check valve, including valve body, first valve piece and second valve piece, be equipped with synchronous device and damping mechanism on first valve piece and second valve piece, make first valve piece and second valve piece can synchronously and flexibly open and close. In addition, the butterfly type fireproof check valve still includes locking mechanism, can in time effectively synchronously lock first valve piece and second valve piece after the fire breaks out. The butterfly type fireproof check valve of the utility model has the beneficial effect that good sealing effect, small noise, long life, small wind resistance etc. can in time effectively prevent the spread of fire.

Description

Technical Field

[0001] This utility model relates to the field of fire safety, and in particular to a butterfly-type 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 butterfly fireproof check valve, comprising a valve body, a central beam fixedly connected to the valve body and dividing the valve body's channel into a left channel and a right channel, a first valve plate rotatably connected to one side of the central beam via a first hinge for opening and closing the left channel downstream of the fireproof check valve, and a second valve plate rotatably connected to the other side of the central beam via a second hinge for opening and closing the right channel downstream of the fireproof check valve, wherein a synchronization device is provided between the first hinge and the second hinge so that the first valve plate and the second valve plate synchronously open and close the left channel and the right channel.

[0007] Furthermore, the synchronization device includes a pair of meshing gears disposed on the outer periphery of the first hinge seat of the first hinge and the second hinge seat of the second hinge, respectively.

[0008] Furthermore, one or both of the first and second valve plates are provided with a damping mechanism for slowing down the opening and closing speeds of the first and second valve plates. For example, the first valve plate is provided with a first damping spring, and the second valve plate is provided with a second damping spring.

[0009] Furthermore, the butterfly fireproof check valve also includes a locking mechanism. The locking mechanism includes a first lever and a second lever for locking the first valve plate and the second valve plate of the butterfly fireproof check valve, respectively, and a first temperature sensing mechanism for sensing the flue gas temperature. The first temperature sensing mechanism is connected to the first lever so that when the flue gas temperature is greater than or equal to a 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] Furthermore, the first temperature sensing mechanism is fixed to the valve body of the butterfly fireproof check valve through the second temperature sensing mechanism.

[0018] 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.

[0019] 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.

[0020] Compared with the prior art, the present invention has at least the following beneficial technical effects: This invention relates to a butterfly-type fireproof check valve, which enables the synchronous and flexible opening and closing of the first and second valve plates on the left and right channels, respectively. Furthermore, its locking mechanism ensures timely and effective synchronous locking of both valve plates in the event of a fire. Compared to existing technologies, this butterfly-type fireproof check valve offers advantages such as superior sealing, lower noise, longer lifespan, and lower air resistance, effectively preventing the spread of fire.

[0021] 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.

[0022] 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.

[0023] 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

[0024] Figure 1 This is a structural schematic diagram of a butterfly-type fireproof check valve according to the present utility model; Figure 2 yes Figure 1 The diagram shows the structure of the hinge used to connect the valve disc in the butterfly fireproof check valve. Figure 3 yes Figure 1 The diagram shows the structural composition of the butterfly fireproof check valve and the locking mechanism. Figure 4 yes Figure 3 A schematic diagram of the locking mechanism in the combination shown; Figure 5 yes Figure 4 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, 311-First hinge, 312-First damping spring, 313-First hinge seat, 32-Second valve plate, 321-Second hinge, 322-Second damping spring, 323-Second hinge seat, 41-Valve body, 411-Center beam. Detailed Implementation

[0025] 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.

[0026] refer to Figure 1-2 According to the present invention, a locking mechanism for a 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, a first valve plate 31 rotatably connected to one side of the central beam 411 via a first hinge 311 for opening and closing the left channel downstream of the fireproof check valve, and a second valve plate 32 rotatably connected to the other side of the central beam 411 via a second hinge 321 for opening and closing the right channel downstream of the fireproof check valve. The outer peripheries of the first hinge seat 313 of the first hinge 311 and the second hinge seat 323 of the second hinge 321 each form a pair of meshing gears, such that the first hinge seat 313 and the second hinge seat 323 are toothed together, enabling the first valve plate 31 and the second valve plate 32 to simultaneously open and close the left channel and the right channel.

[0027] Compared with existing technologies that do not achieve synchronization between the left and right channels, the butterfly-type fireproof check valve of this invention can achieve synchronous opening and closing of the left and right channels by the first valve plate 31 and the second valve plate 32, ensuring that the valve plates on both sides are pressed simultaneously, avoiding poor sealing caused by uneven force on one side (such as smoke or flame leakage when one side is not closed); when the valve plates close synchronously, the medium (such as oil fumes, airflow) is symmetrically cut off, reducing the risk of eddies or local leakage; the synchronous action shortens the valve's full closing time (such as when the temperature sensing element is triggered in a fire, the valve plate can be completely closed within 1-2 seconds), thus blocking the spread of fire more quickly; when the valve plates open synchronously, the flow channel unfolds symmetrically, avoiding turbulence caused by premature opening on one side, reducing system wind resistance; and the symmetrical movement can counteract the impact of asymmetrical airflow, preventing the valve from producing abnormal noise or structural fatigue due to airflow oscillation.

[0028] In some cases, a first damping spring 312 and a second damping spring 322 are respectively installed between the first valve plate 31 and the second valve plate 32 and the central beam 411 to slow down the opening and closing speed of the first valve plate 31 and the second valve plate 32, thereby achieving flexible opening and closing. Compared with the prior art, which does not use damping springs, in this invention, the damping springs provide continuous clamping force when the valve plates are close to closing, helping the valve plates to smoothly fit against the valve seat, thereby ensuring the sealing force when closed. At the same time, it can also avoid violent collisions between the valve plates and the valve body when the valve plates open and close, reduce valve plate deformation and damage to the sealing surface, reduce vibration and the noise and structural loosening caused by it, extend the valve life, avoid frequent swinging or "fluttering" of the valve plates when the airflow is unstable (such as the start and stop of the range hood, pressure fluctuations, etc.), and provide redundant protection for valve plate locking under high temperature conditions during fire.

[0029] refer to Figure 3-5 The butterfly fireproof check valve also includes a locking mechanism, which 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, a first spring 13 mounted on the proximal pivot of the first lever 11 for driving the first lever 11 to rotate clockwise, a second spring 14 mounted on the proximal pivot of the second lever 12 for driving the second lever 12 to rotate counterclockwise, and a locking mechanism fixed to the mounting bracket 19 for limiting the first lever 11 and the second lever 12. The first baffle 15 and the second baffle 16 are at the rotational position limit, and the first hot melt sheet 21 is fixed to the middle beam 411 and located downstream of the fireproof check valve. 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. The free end and the fixed end 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.

[0030] 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.

[0031] When a fire occurs downstream of the fireproof check valve, the heat-sensitive material of the first hot melt sheet 21 melts upon reaching a first 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... The second protrusion 18 is released (no longer pressed against), 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 high-temperature smoke downstream of the fireproof check valve from entering upstream through the fireproof check valve in the event of a fire, thus preventing the spread of the fire. The first set temperature can be, for example, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 250, 300, 350 degrees Celsius or higher.

[0032] 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.

[0033] 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.

[0034] When a fire occurs upstream of the fireproof check valve, the heat-sensitive material of the second hot melt sheet 22 melts upon reaching the second 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 position 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, the first lever 11 rotates clockwise... When rotated, the first protrusion 17 releases (no longer abuts) 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 high-temperature smoke upstream of the fireproof check valve from entering downstream through the fireproof check valve in the event of a fire, thus preventing the spread of the fire. The second set temperature can be, for example, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 250, 300, 350 degrees Celsius or higher.

[0035] 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.

[0036] 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.

[0037] 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 butterfly-type fireproof check valve, comprising a valve body, a central beam fixedly connected to the valve body dividing the valve body's passage into a left passage and a right passage, a first valve plate rotatably connected to one side of the central beam via a first hinge for opening and closing the left passage downstream of the fireproof check valve, and a second valve plate rotatably connected to the other side of the central beam via a second hinge for opening and closing the right passage downstream of the fireproof check valve, characterized in that, A synchronization device is provided between the first hinge and the second hinge so that the first valve plate and the second valve plate open and close the left channel and the right channel simultaneously.

2. The butterfly fire-rated check valve of claim 1, wherein, The synchronization device includes a pair of meshing gears disposed on the outer periphery of the first hinge seat of the first hinge and the second hinge seat of the second hinge, respectively.

3. The butterfly fire-rated check valve according to claim 1 or 2, wherein, One or both of the first valve plate and the second valve plate are provided with a damping mechanism for slowing down the opening and closing speed of the first valve plate and the second valve plate.

4. The butterfly fire-rated check valve of claim 3, wherein, It also includes a locking mechanism, wherein the locking mechanism includes a first lever and a second lever for locking the first valve plate and the second valve plate of the butterfly fireproof check valve, respectively, and a first temperature sensing mechanism for sensing the flue gas temperature. The first temperature sensing mechanism is connected to the first lever so that when the flue gas temperature is greater than or equal to a 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.

5. The butterfly fire-rated check valve of claim 4, wherein, 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.

6. The butterfly fire-rated check valve of claim 5, wherein, 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.

7. The butterfly fire-rated check valve of claim 6, wherein, 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.

8. The butterfly fire-rated check valve of claim 6, wherein, 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.

9. The butterfly fire-rated check valve of claim 8, wherein, 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.

10. The butterfly fire-rated check valve of claim 8, wherein, 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.

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