Check valve with fireproof function

Abstract

The utility model relates to the technical field of check valves, and discloses a check valve with a fireproof function, which comprises a mounting seat, a sleeve is arranged on the mounting seat, two rotating shafts are rotatably arranged in the sleeve, one side of each rotating shaft is fixedly provided with a valve clack, and the other side of each rotating shaft is fixedly provided with a valve rod. A closing assembly for automatically closing and fixing the valve clack when open fire appears is arranged in the sleeve, and an unlocking assembly for relieving the limiting effect on the closing assembly when open fire appears is arranged on one side of the closing assembly. By arranging the closing assembly and the unlocking assembly, when open fire or high temperature occurs, the unlocking assembly can be melted by the high temperature, in this way, the closing assembly loses limitation of the unlocking assembly, the closing assembly can be automatically opened, after the closing assembly is opened, the two valve clacks can be pushed and abut against each other, and the sleeve can be completely closed through the two valve clacks; air circulation is avoided, and meanwhile flames can be limited to a certain degree.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a check valve with a fire prevention function. Background Art

[0002] At present, flue check valves are generally used in household range hood exhaust ducts, including range hood check valves, plastic telescopic smoke pipes and flue check valves. The check valve is mainly composed of a valve body, a rocker, a valve cover, etc.

[0003] A new type of public flue check valve is disclosed in the Chinese utility model patent with the announcement number CN202884135U. Although the above-mentioned prior art can be applied to different situations, has strong versatility, and is easy and quick to install, when an open flame appears in the environment, the spring on the check valve will be burned by the open flame and lose its elasticity, causing the valve flap of the check valve to be unable to close tightly, allowing air to circulate. This not only fails to limit the fire, but also causes a small amount of flame to enter the house. Therefore, it is necessary to design a check valve that can automatically close the valve flap of the check valve to block the flame when an open flame appears. Utility Model Content

[0004] In order to solve the technical problem that the current check valve loses its original effect and cannot limit the fire when encountering open flames, the utility model provides a check valve with a fire prevention function.

[0005] The utility model is implemented by the following technical solutions: a check valve with a fire-proof function, comprising a mounting seat, a sleeve provided on the mounting seat, two rotating shafts provided for internal rotation of the sleeve, a valve disc fixedly installed on one side of each rotating shaft, a closing component provided inside the sleeve for automatically closing and fixing the valve disc when an open flame occurs, an unlocking component provided on one side of the closing component for releasing the restrictive effect of the closing component when an open flame occurs, the closing component comprising a fixed plate fixedly mounted inside the sleeve, a mounting frame fixedly mounted on one side of the fixing plate and arranged in a concave shape, two bent push rods provided on one side of the mounting frame, one end of the two bent push rods both pass through the mounting frame and the fixing plate, a torsion spring is sleeved on the two bent push rods, and the two torsion springs are both located inside the mounting frame.

[0006] Through the above technical solution, when an open flame or high temperature appears, the unlocking component will be melted by the high temperature, so that the closing component will lose the restriction of the unlocking component, allowing the closing component to open automatically. After the closing component is opened, it will push and press the two valve flaps, so that the two valve flaps will completely close the sleeve to prevent air circulation, while also restricting the flame to a certain extent.

[0007] As a further improvement of the above solution, a pulling hook is fixedly installed at one end of the two torsion springs, and the pulling ends of the two pulling hooks are clamped with adjacent bent push rods.

[0008] Through the above technical solution, the rotation of the torsion spring will cause the pulling hook to pull the bent push rod to move, thereby pushing the valve disc to resist.

[0009] As a further improvement of the above solution, first limiting plates are fixedly installed on both sides of the mounting frame, and a first limiting groove is formed on one side of the two first limiting plates.

[0010] Through the above technical solution, the first limit plate can prevent the bending push rod from opening at too large an angle, thereby affecting the closing of the valve disc.

[0011] As a further improvement of the above solution, a second limiting plate fixedly installed on the mounting frame is provided between the two first limiting plates, and second limiting grooves are opened on both sides of the second limiting plate, and the two bent push rods are both in contact with the inner walls of adjacent second limiting grooves.

[0012] Through the above technical solution, the second limiting groove supports the bending push rod, preventing the bending push rod from deviating from the mounting frame and the torsion spring.

[0013] As a further improvement of the above solution, the unlocking assembly includes a fusible link arranged between two bent push rods and fixed blocks fixedly installed at both ends of the fusible link, and the two fixed blocks are fixedly sleeved on adjacent bent push rods.

[0014] Through the above technical solution, the fusible line is made of plastic with a low melting point, so that no matter it encounters open flame or high temperature, the fusible line will break, allowing the bent push rod to push the valve disc closed.

[0015] As a further improvement of the above solution, both valve flaps are provided with multiple fixing holes passing through them, a rubber sheet is provided inside the sleeve, and multiple rubber protrusions are fixedly installed on one side of the rubber sheet, and one end of each rubber protrusion passes through an adjacent fixing hole.

[0016] Through the above technical solution, the rubber sheet is installed on the valve disc through the rubber protrusion, which can improve the sealing degree of the valve disc to the sleeve.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model provides a closing component and an unlocking component. When an open flame or high temperature appears, the unlocking component will be melted by the high temperature, so that the closing component will lose the restriction of the unlocking component, and the closing component can be automatically opened. After the closing component is opened, the two valve flaps will be pushed and pressed against each other, so that the two valve flaps will completely seal the sleeve to prevent air circulation, and at the same time can also limit the flame to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the utility model with a closing component;

[0021] Figure 3 This is a schematic diagram of the structure of the unlocking component of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the utility model with a rubber sheet;

[0023] Figure 5 This is a structural diagram of another installation method of the rubber sheet of the utility model.

[0024] Description of main symbols:

[0025] 1. Mounting seat; 2. Sleeve; 3. Rotating shaft; 4. Valve disc; 501. Fixing plate; 502. Mounting frame; 503. Bending push rod; 504. Torsion spring; 601. Fusible link; 602. Fixing block; 7. Pull hook; 8. First limit plate; 9. Second limit plate; 10. Rubber sheet. DETAILED DESCRIPTION

[0026] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] Please combine Figure 1-Figure 5, a check valve with a fireproof function in this embodiment includes a mounting seat 1, a sleeve 2 is provided on the mounting seat 1, two rotating shafts 3 are provided for rotation inside the sleeve 2, and a valve flap 4 is fixedly installed on one side of each rotating shaft 3, and a closing component is provided inside the sleeve 2 for automatically closing and fixing the valve flap 4 when an open flame appears, and an unlocking component is provided on one side of the closing component for releasing the restriction effect of the closing component when an open flame appears. When an open flame or high temperature appears, the unlocking component will be melted by the high temperature, so that the closing component will lose the restriction of the unlocking component, so that the closing component can be automatically opened, and after the closing component is opened, it will push and resist the two valve flaps 4, so that the two valve flaps 4 will completely seal the sleeve 2 to prevent air circulation, while also restricting the flame to a certain extent;

[0028] Combine Figure 1-Figure 3 The closing assembly includes a fixed plate 501 fixedly installed inside the sleeve 2, a concave mounting bracket 502 fixedly installed on one side of the fixed plate 501, and two bent push rods 503 arranged on one side of the mounting bracket 502. One end of the two bent push rods 503 passes through the mounting bracket 502 and the fixed plate 501. The two bent push rods 503 are both sleeved with torsion springs 504. The two torsion springs 504 are both located inside the mounting bracket 502. One end of the two torsion springs 504 is fixedly installed with a pulling hook 7. The pulling ends of the two pulling hooks 7 are both clamped with adjacent bent push rods 503. When the torsion spring 504 rotates, the pulling hook 7 will pull the bent push rod 503 to move, thereby pushing the valve disc 4 to resist.

[0029] Combine Figure 1-Figure 3 A first limiting plate 8 is fixedly installed on both sides of the mounting frame 502, and a first limiting groove is opened on one side of the two first limiting plates 8. A second limiting plate 9 fixedly installed on the mounting frame 502 is provided between the two first limiting plates 8, and a second limiting groove is opened on both sides of the second limiting plate 9. The two bent push rods 503 are both in contact with the inner walls of the adjacent second limiting grooves. The second limiting grooves will support the bent push rod 503 to prevent the bent push rod 503 from deviating from the mounting frame 502 and the torsion spring 504.

[0030] Combine Figure 1-Figure 3 The unlocking assembly includes a fusible link 601 arranged between the two bent push rods 503 and fixed blocks 602 fixedly installed at both ends of the fusible link 601. The two fixed blocks 602 are fixedly sleeved on the adjacent bent push rods 503. The fusible link 601 is made of plastic with a low melting point. In this way, whether it encounters open flame or high temperature, the fusible link 601 will break, allowing the bent push rod 503 to push the valve disc 4 closed.

[0031] Combine Figure 2 and Figure 4, both valve discs 4 are provided with a plurality of fixing holes penetrating through them, a rubber sheet 10 is provided inside the sleeve 2, a plurality of rubber bumps are fixedly mounted on one side of the rubber sheet 10, one end of each rubber bump passes through the adjacent fixing hole, and the rubber sheet 10 is mounted on the valve disc 4 through the rubber bumps, which can improve the sealing degree of the valve disc 4 to the sleeve 2;

[0032] Combine Figure 5 The rubber sheet 10 and the valve flap 4 can also be installed in the following way: the rubber sheet 10 is located on one side of the valve flap 4, a first clip is provided on one side of the rubber sheet 10, and a second clip is provided on one side of the valve flap 4. The positions of the first clip and the second clip correspond to each other, and the screws pass through the second clip, the valve flap 4, the rubber sheet 10 and the first clip in sequence and are tightened.

[0033] The implementation principle of a fireproof check valve in the embodiment of the present application is as follows: when there is high temperature or open flame, the fusible link 601 will be melted. Because the fusible link 601 is made of plastic with a low melting point, such as polyethylene, polypropylene, and polyvinyl chloride, the fusible link 601 will break regardless of whether it encounters open flame or high temperature.

[0034] After the fusible link 601 breaks, the torsion spring 504 loses its restrictive force and rotates. The rotation of the torsion spring 504 moves the pulling hook 7, thereby pushing the bent push rod 503. After the bent push rod 503 moves, it pushes the valve flap 4 against the valve flap 4, so that the valve flap 4 cannot be opened. In conjunction with the rubber sheet 10, air circulation can be prevented, and the flame can be blocked to a certain extent.

[0035] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A check valve with a fireproof function, comprising a mounting seat (1), a sleeve (2) provided on the mounting seat (1), two rotating shafts (3) provided for rotation inside the sleeve (2), a valve disc (4) fixedly mounted on one side of each rotating shaft (3), characterized in that: The interior of the sleeve (2) is provided with a closing component that automatically closes and fixes the valve flap (4) when an open flame occurs, and one side of the closing component is provided with an unlocking component that releases the restrictive effect of the closing component when an open flame occurs. The closing component comprises a fixing plate (501) fixedly mounted inside the sleeve (2), a mounting frame (502) fixedly mounted on one side of the fixing plate (501) and arranged in a concave shape, and two bent push rods (503) arranged on one side of the mounting frame (502), one end of each of the two bent push rods (503) passes through the mounting frame (502) and the fixing plate (501), and a torsion spring (504) is sleeved on each of the two bent push rods (503), and the two torsion springs (504) are both located inside the mounting frame (502).

2. A check valve with fire protection function as claimed in claim 1, characterized in that: One end of each of the two torsion springs (504) is fixedly mounted with a pulling hook (7), and the pulling ends of the two pulling hooks (7) are both engaged with adjacent bent push rods (503).

3. A check valve with fire protection function as claimed in claim 1, characterized in that: First limiting plates (8) are fixedly mounted on both sides of the mounting frame (502), and a first limiting groove is provided on one side of each of the two first limiting plates (8).

4. A fire-proof check valve according to claim 3, characterized in that: A second limiting plate (9) fixedly mounted on the mounting frame (502) is provided between the two first limiting plates (8), and second limiting grooves are provided on both sides of the second limiting plate (9), and the two bent push rods (503) are both fitted with the inner walls of adjacent second limiting grooves.

5. A check valve with fire protection function as claimed in claim 1, characterized in that: The unlocking assembly comprises a fusible link (601) arranged between two bent push rods (503) and fixed blocks (602) fixedly mounted on both ends of the fusible link (601), and the two fixed blocks (602) are fixedly sleeved on adjacent bent push rods (503).

6. A check valve with fire protection function as claimed in claim 1, characterized in that: The two valve flaps (4) are each provided with a plurality of fixing holes passing through them, a rubber sheet (10) is provided inside the sleeve (2), a plurality of rubber protrusions are fixedly mounted on one side of the rubber sheet (10), and one end of each rubber protrusion passes through an adjacent fixing hole.

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