Anti-sticking fully-sealed kitchen flue check valve

Abstract

The utility model provides an anti-sticking fully-sealed kitchen flue check valve, which solves the problems that a valve plate is easy to stick after the existing flue check valve is used for a long time, so that a flue is difficult to open and shield, and adopts the technical scheme that a frame body inclined towards an inlet direction is arranged on the inner wall of a channel at the middle section of a valve body; a double-door type valve plate is hinged to the middle of the frame through a longitudinal supporting beam, the inner side of the valve plate is in lap joint with an edge opening of the frame in a sealed mode, a steel wire torsional spring used for closing the double valve plate is arranged on the outer side of the longitudinal supporting beam, a sealing gasket is arranged on the inner side edge of the valve plate, the inner side edge of the sealing gasket is arranged in an inserting groove of the valve plate, and the sealing gasket is fixed through a pressing plate. And a sealing rib which is provided with a hard sharp edge and correspondingly abuts against the sealing gasket when the valve plate is in a closed state is arranged at the edge opening of the frame body. The valve plate and a channel opening are reliably sealed, adhesion is prevented, opening is easy, the fireproof performance is high, the service life is long, and a flue is not shielded.

Description

Technical Field

[0001] This utility model relates to a backflow preventer for exhaust ducts, and in particular to a non-stick, fully sealed kitchen exhaust duct backflow preventer, which is suitable for connecting the indoor exhaust fume outlet to the shared kitchen exhaust duct. Background Technology

[0002] Currently, kitchen exhaust vents in urban residential buildings are typically connected to a shared, vertical exhaust duct. To prevent backflow of smoke and odors, as well as for fire prevention, backflow preventers are installed at the exhaust vent. These valves are generally made of plastic, and over time, accumulated dirt can cause the valve cover seal to stick to the valve body frame, blocking the exhaust duct and preventing the smooth expulsion of smoke. This not only fails to prevent fire but also poses a fire hazard. According to the requirements of the Ministry of Construction, backflow preventers in exhaust ducts should have fire-resistant functions. The inventors disclosed a multi-purpose kitchen exhaust backflow preventer valve in patent document CN204512551U. The valve features a double-leaf valve plate, and its body structure comprises a cylindrical valve body consisting of a front section, a middle section, and a rear section connected by an annular insertion interface. A middle frame is located at the smoke vent of the middle section, and a double-leaf semi-circular valve plate is hinged to the middle frame for sealing with the inner frame. The valve plate gradually tilts upwards towards the channel inlet. A sealing strip is assembled along the edge of the smoke vent. A steel wire torsion spring is located behind the middle frame to close the double-leaf valve plate. When exhausting air, the increased outward air pressure causes the double-leaf valve plate to overcome the pressure of the steel wire torsion spring and flip open, connecting the inside and outside of the smoke vent, allowing smoke to escape. When exhausting air stops, the valve plate tilts inwards and closes under gravity and the pressure of the steel wire torsion spring. After prolonged use, the sealing strips become sticky with oil and dirt, and due to the large contact area with the valve plate, they are prone to adhesion. This can cause the valve plate to fail to open, the valve body to malfunction, and difficulties in opening and closing, posing a safety hazard. Summary of the Invention

[0003] The purpose of this invention is to provide a non-stick, fully sealed kitchen flue backflow preventer valve, which solves the problem that existing flue backflow preventers tend to stick together after long-term use, making them difficult to open and obstructing the flue. Its valve plate provides a reliable seal with the flue opening, prevents sticking, is easy to open, and has strong fire resistance.

[0004] The technical solution adopted by this utility model is as follows: The anti-stick, fully sealed kitchen flue backflow preventer valve includes a cylindrical valve body. The inner wall of the channel in the middle section of the valve body is provided with a frame that is inclined towards the inlet direction. The middle part of the frame is hinged with a double-door valve plate by a longitudinal support beam. The inner side of the valve plate is sealed and overlaps the edge of the frame. A steel wire torsion spring for closing the double-door valve plate is provided on the outer side of the longitudinal support beam. The key technical point is that a sealing gasket is provided on the inner edge of the valve plate. The inner edge of the sealing gasket is set in the slot of the valve plate and the sealing gasket is fixed by a pressure plate. The edge of the frame is provided with a sealing ridge with a hard pointed edge that corresponds to the sealing gasket when the valve plate is closed.

[0005] The outer edge of the sealing gasket overlaps the valve plate, and an elastic sealing section is formed between the outer edge and the inner edge of the sealing gasket. The sealing ridge corresponds to the elastic sealing section of the sealing gasket.

[0006] The pressure plate is fixed to the inner side of the valve plate via a slot.

[0007] The elastic sealing section has a gap with the inner side of the valve plate.

[0008] The valve plate and / or pressure plate are made of plastic.

[0009] The advantages and beneficial effects of this utility model are as follows: Because this anti-stick, fully sealed kitchen flue backflow preventer valve uses a double-door valve plate, a sealing gasket is installed on the inner side of the valve plate. The inner edge of the sealing gasket is set in a slot in the valve plate and fixed by a pressure plate. The frame has a sealing ridge with a hard, pointed edge that corresponds to the sealing gasket when the valve plate is closed. This allows the sealing ridge to form an effective, fully sealed contact with the sealing gasket. Since the sealing gasket is set on the valve plate and faces downwards towards the valve inlet, it is frequently opened and closed, making it less prone to grease buildup. Furthermore, the hard, pointed edge of the sealing ridge forms a linear contact seal with the sealing gasket, greatly reducing the contact area and effectively preventing the sticky residue formed by grease from adhering between the sealing ridge and the sealing gasket. Therefore, after long-term use, it can prevent the valve core from failing to open, ensuring smooth flue ventilation. It has the advantages of long service life and not obstructing the flue. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings.

[0011] Figure 1 This is a structural schematic diagram of the outlet end direction of an embodiment of the present invention;

[0012] Figure 2 yes Figure 1 Sectional view along axis AA;

[0013] Figure 3 yes Figure 2 A magnified view of part B;

[0014] Figure 4 This is a schematic diagram of the valve plate structure according to an embodiment of the present utility model;

[0015] Figure 5 This is a schematic diagram of the usage state structure of an embodiment of this utility model.

[0016] The numbers in the diagram are explained as follows: 1. Valve body, 2. Valve plate, 3. Frame, 4. Longitudinal support beam, 5. Sealing ridge, 6. Steel wire torsion spring, 7. Pin, 8. Mounting steel strip, 9. Sealing gasket, 91. Inner edge, 92. Elastic sealing section, 93. Outer edge, 94. Gap, 10. Pressure plate, 11. Plastic ratchet strip, 12. Elastic hook, 13. Slot, 14. Slot, 15. Fume exhaust outlet, 16. Public flue wall. Detailed Implementation

[0017] according to Figure 1-5 This utility model will be described in detail, and its implementation will be illustrated by examples. Figure 1 and Figure 2 As shown, an anti-stick, fully sealed kitchen exhaust backflow preventer valve is an improvement based on a multi-purpose kitchen exhaust backflow preventer valve in the patent document CN204512551U published by the inventor. The valve body of the anti-stick, fully sealed kitchen exhaust backflow preventer valve includes a valve body front section, a valve body middle section, and a valve body rear section connected by plug-in and externally provided elastic hooks 12. The valve body front section is the inlet for connecting to the indoor exhaust pipe. The valve body rear section is provided with a mounting steel strip 8 and a plastic ratchet pull strip 11 for connecting to the exhaust outlet and fixing it to the wall of the public exhaust duct. The inner wall of the channel in the valve body middle section is provided with a frame 3 inclined towards the valve body inlet. The upper part of the frame is inclined at 10-30 degrees towards the valve body front section. The frame 3 is two nearly semi-circular frame shapes symmetrically arranged in a circular channel. A longitudinal support beam 4 is provided in the middle of the frame 3. Symmetrical pins 7 are provided at both ends of the longitudinal support beam, which are hinged to symmetrical double-door semi-circular valve plates 2. The valve plate 2 has an inner sealing overlap with the frame 3 along its edge, and a steel wire torsion spring 6 for closing the double-leaf valve plate is provided on the outer side of the longitudinal support beam 4. This structure is identical to a multi-purpose kitchen exhaust backflow preventer valve in the embodiment of patent document CN204512551U. The improvement is as follows: Figure 3 and Figure 4 As shown, a sealing gasket 9 is provided on the inner edge of the valve plate 2. The sealing gasket can be an elastic rubber sealing gasket. A slot 14 corresponding to the sealing gasket is provided on the inner side of the valve plate. The inner edge 91 of the sealing gasket 9 is inserted into the slot 14 of the valve plate 2 by means of a protrusion and is fixed by a pressure plate 10 provided on the inner side of the valve plate. The pressure plate can be installed and fixed to the inner side of the valve plate 2 by means of a slot 13 or by means of adhesive bonding, which facilitates the installation and fixing of the sealing gasket. The valve plate 2 and / or the pressure plate 10 can be made of plastic. A sealing ridge 5 with a hard pointed edge is provided along the edge of the frame 3 corresponding to the elastic sealing section. When the valve plate is closed, the hard pointed edge of the sealing ridge abuts against the sealing gasket. The sealing ridge can be made of hard plastic and can be integrally formed with the frame.

[0018] As a further improvement, such as Figure 3 and Figure 4As shown, the outer edge 93 of the sealing gasket 9 can overlap with the valve plate, forming an elastic sealing section 92 between the outer edge 93 and the inner edge 91. A gap 94 can be left between the elastic sealing section 92 and the corresponding inner surface of the valve plate to create a deformation space for the elastic sealing section under pressure, thereby increasing the sealing effect. The elastic sealing section increases the overall area of ​​the sealing gasket and also increases the installation firmness. The elastic sealing section between the outer and inner edges of the sealing gasket serves as the sealing contact part, forming an elastic seal, thus increasing the sealing effect with the sealing ridge and preventing adhesion.

[0019] In use, the rear section of valve body 1 is fixed to the common flue wall 16 of the fume exhaust outlet 15 using a steel strip and a plastic ratchet pull strip. After installation and connection, in the natural state, valve plate 2 closes due to its own weight and the elastic pressure of the steel wire torsion spring, and the sealing gasket of valve plate is pressed against the sealing protrusion of the frame, which is the closed state. In the exhaust state, the air supply to the valve body outlet pushes open the valve plate, and the valve plate is in the open state, connecting the exhaust channel. The frame edge is provided with a sealing protrusion with a hard pointed edge corresponding to the elastic sealing section, which can form an effective sealing contact between the sealing gasket and the elastic sealing section. Since the sealing gasket is set on the valve plate and faces downwards with the valve plate, it is frequently opened and closed, making it difficult for grease to accumulate on the sealing gasket. Furthermore, the hard pointed edge of the sealing protrusion forms a line contact seal with the sealing gasket, which greatly reduces the contact area and effectively avoids the adhesion of viscous substances formed by grease between the sealing protrusion and the sealing gasket. Therefore, after long-term use, it can prevent the valve core from failing to open, allowing the smoke exhaust to pass smoothly. It has the advantages of long service life and not obstructing the flue.

[0020] In summary, the purpose of this utility model has been achieved.

Claims

1. A non-stick, fully sealed kitchen flue backflow preventer valve, comprising a cylindrical valve body, a frame inclined towards the inlet direction provided on the inner wall of the channel in the middle section of the valve body, a double-leaf valve plate hinged to the middle of the frame by a longitudinal support beam, the inner side of the valve plate sealingly overlapping the edge of the frame, and a steel wire torsion spring for closing the double-leaf valve plate provided on the outer side of the longitudinal support beam, characterized in that: The inner edge of the sealing gasket is arranged in the insertion slot of the valve plate, and the sealing gasket is fixed by the pressing plate.

2. The stick-resistant, totally sealed, kitchen vent check valve according to claim 1, wherein: The outer edge of the sealing gasket overlaps the valve plate, and the elastic sealing section is formed between the outer edge and the inner edge of the sealing gasket.

3. A stick-resistant, totally sealed, kitchen vent check valve according to claim 1 or 2, characterized in that: The pressing plate is fixed to the inner side of the valve plate through the clamping slot.

4. The stick-resistant, totally sealed, kitchen vent check valve of claim 2, wherein: The elastic sealing section leaves a gap with the inner side of the valve plate.

5. A stick-resistant, totally sealed, kitchen vent check valve according to claim 1 or 2, characterized in that: The valve plate and / or the pressing plate are plastic plates.

Images