Flue adjustable check valve

Abstract

The utility model discloses a flue adjustable check valve relates to check valve technical field, this flue adjustable check valve, including check valve casing, the inside of check valve casing is provided with two valve plates, two the both ends of valve plate are fixedly connected with the installation shaft, the surface of installation shaft is rotatably connected with the inside of valve plate, the inner wall of check valve casing is fixedly connected with the installation shaft, the surface swing sleeve joint of installation shaft has torsional spring, the both ends of torsional spring are contacted with the surface of two valve plates respectively, the surface fixed connection of check valve casing has servo motor, the output of servo motor is rotatably connected with the inside of check valve casing. This flue adjustable check valve, when using the range hood, according to the gear of range hood setting or the size of flue gas flow, control servo motor's rotation angle, thereby control two valve plate open's range size, avoid the abnormal collision of the unstable airflow and cause damage that two valve plate open and close.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and in particular to an adjustable check valve for flues. Background Technology

[0002] A flue check valve, also known as a backflow valve, non-return valve, back pressure valve, one-way valve, or flue valve, is an automatic valve that opens and closes automatically based on the force generated by the flow of the medium in the pipeline. Flue check valves are an essential component of every household's range hood installation, making optimization of flue check valves necessary.

[0003] However, current flue check valves open and close using torsion springs, which cannot adjust the flow rate according to the range hood's setting. When gas is discharged, both valve plates open. When the amount of discharged gas is unstable, the opening and closing of the valve plates will constantly change, causing the two valve plates to easily collide with each other, resulting in loosening and damage. The collision between the two valve plates also produces noise. Therefore, it is necessary to design a flue check valve that can adjust the opening and closing of the valve plates to control the flow rate according to the range hood's setting. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide an adjustable flue check valve that can solve the problems in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adjustable check valve for a flue, comprising a check valve housing, two valve plates disposed inside the check valve housing, and mounting shafts fixedly connected to both ends of the two valve plates. The surfaces of the mounting shafts are rotatably connected to the interior of the valve plates. The inner wall of the check valve housing is fixedly connected to the mounting shafts, and a torsion spring is movably sleeved on the surface of the mounting shafts. The two ends of the torsion springs respectively contact the surfaces of the two valve plates. A servo motor is fixedly connected to the surface of the check valve housing, and the output end of the servo motor is rotatably connected to the interior of the check valve housing. A rotating shaft is fixedly connected to the output end of the servo motor, and the end of the rotating shaft away from the servo motor is rotatably connected to the interior of the check valve housing. A winding roller is fixedly connected to the surface of the rotating shaft, and a traction rope is fixedly connected to the surface of the winding roller. The end of the traction rope away from the winding roller is fixedly connected to the surface of one of the valve plates. A differential pressure sensor is fixedly connected to the surface of the check valve housing, and the differential pressure sensor is electrically connected to the control panel of the range hood and the servo motor.

[0006] Preferably, a fixing plate is fixedly connected to the inner wall of the check valve housing. The fixing plate is in contact with the surfaces of the two valve plates and is located between the two valve plates. A fixing ring with a conical inner wall is fixedly connected to the inner wall of the check valve housing. The fixing plate is fixedly connected to the inner wall of the fixing ring. The surface of the fixing ring is also in contact with the surfaces of the two valve plates. High-temperature resistant rubber pads are fixedly connected to the side of the fixing plate and the fixing ring closest to the valve plates.

[0007] Preferably, two limiting plates are fixedly connected to the surfaces of both valve plates, and the two ends of the torsion spring are respectively located between the two sets of limiting plates.

[0008] Preferably, both mounting shafts are fixedly connected to shaped gears on the surfaces inside the check valve housing, and the two shaped gears mesh with each other.

[0009] Preferably, an electric telescopic rod is fixedly connected to the surface of the check valve housing, the output end of the electric telescopic rod is slidably connected to the inside of the check valve housing, and the electric telescopic rod is electrically connected to the control panel of the external range hood.

[0010] Preferably, the output end of the electric telescopic rod is fixedly connected to a fan-shaped insert rod, and the end of the rotating shaft near the insert rod is fixedly connected to a spiral trapezoidal adjusting rod, with the notches of the insert rod and the adjusting rod corresponding to each other.

[0011] Compared with the prior art, the beneficial effects of this utility model are: The adjustable check valve in this flue allows the servo motor to rotate at the appropriate angle based on the range hood setting or the amount of flue gas flow. This controls the opening range of the two valve plates, preventing unstable airflow from causing abnormal opening and closing of the two valve plates and resulting in collisions and damage. This also improves the lifespan of the device.

[0012] The adjustable check valve in this flue allows the two valve plates to open or close synchronously, thus preventing the accumulation of grease near the valve plate with a small opening. This avoids the problem of restricted flow and poor smoke exhaust after prolonged use, as well as poor closure when there is no smoke, which can easily cause backflow of flue gas. This improves the effectiveness of the device. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of an adjustable check valve for a flue according to the present invention; Figure 2 This is a schematic diagram of the check valve housing of this utility model; Figure 3 This is a schematic diagram of the surface structure of the rotating shaft of this utility model; Figure 4This is a schematic diagram of the mounting shaft surface structure of this utility model.

[0014] Reference numerals in the attached diagram: 1. Check valve housing; 2. Fixing plate; 3. Fixing ring; 4. Valve plate; 5. Differential pressure sensor; 6. Servo motor; 7. Electric telescopic rod; 8. Mounting shaft; 9. Limiting plate; 10. Rotating shaft; 11. Traction rope; 12. Take-up roller; 13. Fixing rod; 14. Torsion spring; 15. Insert rod; 16. Adjusting rod; 17. Irregular gear. Detailed Implementation

[0015] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0016] Please see Figure 1-4 This utility model provides a technical solution: an adjustable check valve for a flue, including a check valve housing 1. Two valve plates 4 are disposed inside the check valve housing 1. Mounting shafts 8 are fixedly connected to both ends of the two valve plates 4. The surfaces of the mounting shafts 8 are rotatably connected to the interior of the valve plates 4. A fixing plate 2 is fixedly connected to the inner wall of the check valve housing 1. The fixing plate 2 contacts the surfaces of the two valve plates 4 and is located between the two valve plates 4, used to seal the gap between the two valve plates 4 to prevent smoke from escaping through the gap. A fixing ring 3 with a conical inner wall is fixedly connected to the inner wall of the check valve housing 1. The fixing plate 2 is fixedly connected to the inner wall of the fixing ring 3. The surface of the fixing ring 3 also contacts the surfaces of the two valve plates 4, used to seal the gap between the valve plates 4 and the inner wall of the check valve housing 1.

[0017] High-temperature resistant rubber pads are fixedly connected to the side of the fixed plate 2 and the fixed ring 3 near the valve plate 4. The high-temperature resistant rubber pads can seal the gap between the fixed plate 2 and the fixed ring 3 and the valve plate 4, thereby further preventing the smoke from escaping after the check valve is closed. At the same time, the high-temperature resistant rubber pads can buffer the collision between the valve plate 4 and the fixed ring 3 when the check valve is closed, thereby reducing the noise generated when the check valve is closed and improving the performance of the device.

[0018] A mounting shaft 8 is fixedly connected to the inner wall of the check valve housing 1. A torsion spring 14 is movably sleeved on the surface of the mounting shaft 8. The two ends of the torsion spring 14 are in contact with the surfaces of the two valve plates 4 respectively. Two limiting plates 9 are fixedly connected to the surfaces of the two valve plates 4 respectively. The two ends of the torsion spring 14 are located between the two sets of limiting plates 9 respectively. Thus, by setting the limiting plates 9, the position of the torsion spring 14 can be restricted, avoiding the torsion spring 14 from moving randomly in the device and ensuring the stability of the device during use.

[0019] A servo motor 6 is fixedly connected to the surface of the check valve housing 1. The output end of the servo motor 6 is rotatably connected to the interior of the check valve housing 1. A rotating shaft 10 is fixedly connected to the output end of the servo motor 6. The end of the rotating shaft 10 away from the servo motor 6 is rotatably connected to the interior of the check valve housing 1. A take-up roller 12 is fixedly connected to the surface of the rotating shaft 10. A traction rope 11 is fixedly connected to the surface of the take-up roller 12. The end of the traction rope 11 away from the take-up roller 12 is fixedly connected to the surface of a valve plate 4. Thus, the valve plate 4 is pulled by the take-up roller 12 winding the traction rope 11, causing the valve plate 4 to flip within the check valve housing 1, thereby opening the check valve.

[0020] A differential pressure sensor 5 is fixedly connected to the surface of the check valve housing 1. The differential pressure sensor 5 is electrically connected to the control panel of the range hood and to the servo motor 6. This allows the device to adjust the rotation angle of the servo motor 6 according to the flow rate of the flue gas inside the check valve housing 1, thereby adjusting the flip angle of the valve plate 4 and realizing the adjustability of the check valve.

[0021] Two mounting shafts 8 are fixedly connected to shaped gears 17 on the surfaces inside the check valve housing 1. The two shaped gears 17 mesh with each other, so that when one valve plate 4 rotates, it can drive the other valve plate 4 to rotate synchronously through the meshing of the two shaped gears 17. This allows the two valve plates 4 to open or close synchronously, thus avoiding the accumulation of soot near the valve plate 4 with a small opening. This prevents the flow channel from being restricted and the smoke from being poorly discharged after long-term use. It also prevents the valve plate from closing poorly when there is no smoke, which can easily cause backflow of smoke. This improves the performance of the device.

[0022] An electric telescopic rod 7 is fixedly connected to the surface of the check valve housing 1. The output end of the electric telescopic rod 7 is slidably connected to the inside of the check valve housing 1. A fan-shaped insert rod 15 is fixedly connected to the output end of the electric telescopic rod 7. A spiral trapezoidal adjusting rod 16 is fixedly connected to one end of the rotating shaft 10 near the insert rod 15. The notches of the insert rod 15 and the adjusting rod 16 correspond to each other. The electric telescopic rod 7 is electrically connected to the control panel of the external range hood, so that the user can adjust the extension length of the electric telescopic rod 7, thereby adjusting the rotation angle of the rotating shaft 10, and thus adjusting the opening degree of the check valve.

[0023] Working principle: During use, the differential pressure sensor 5 sends a signal to the servo motor 6 based on the flow rate of the flue gas in the check valve housing 1, thereby causing the servo motor 6 to rotate at different angles, which in turn drives the rotating shaft 10 to rotate. This causes the take-up roller 12 to wind up the traction rope 11, which in turn stretches the valve plate 4, causing the mounting shaft 8 to rotate. Simultaneously, through the meshing of two non-standard gears 17, another mounting shaft 8 is driven to rotate, allowing the two valve plates 4 to rotate synchronously. This causes the torsion spring 14 between the two valve plates 4 to twist and deform, opening the check valve and allowing the smoke to flow.

[0024] When the user operates the range hood, to control the opening degree of the check valve, the user can operate the range hood's control panel to close the differential pressure sensor 5. Then, by adjusting the range hood's opening level, the electric telescopic rod 7 can extend to different distances, allowing the insertion rod 15 to be inserted into different parts of the adjusting rod 16. Because the angle at which the rotating shaft 10 can rotate when the insertion rod 15 is in different positions on the adjusting rod 16, the degree of opening of the check valve is different, making the check valve adaptable to a wide range of applications.

[0025] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A flue adjustable check valve, comprising a check valve housing (1), characterized in that: The check valve housing (1) has two valve plates (4) inside. Each valve plate (4) has a mounting shaft (8) fixedly connected to both ends. The surface of the mounting shaft (8) is rotatably connected to the interior of the valve plate (4). The inner wall of the check valve housing (1) is fixedly connected to the mounting shaft (8). A torsion spring (14) is movably sleeved on the surface of the mounting shaft (8). Both ends of the torsion spring (14) are in contact with the surfaces of the two valve plates (4). A servo motor (6) is fixedly connected to the surface of the check valve housing (1). The output end of the servo motor (6) is rotatably connected to the interior of the check valve housing (1). The output end of 6) is fixedly connected to a rotating shaft (10). The end of the rotating shaft (10) away from the servo motor (6) is rotatably connected to the inside of the check valve housing (1). A winding roller (12) is fixedly connected to the surface of the rotating shaft (10). A traction rope (11) is fixedly connected to the surface of the winding roller (12). The end of the traction rope (11) away from the winding roller (12) is fixedly connected to the surface of a valve plate (4). A differential pressure sensor (5) is fixedly connected to the surface of the check valve housing (1). The differential pressure sensor (5) is electrically connected to the operation panel of the range hood. The differential pressure sensor (5) is electrically connected to the servo motor (6).

2. The adjustable check valve for a flue gas duct according to claim 1, characterized in that: A fixing plate (2) is fixedly connected to the inner wall of the check valve housing (1). The fixing plate (2) is in contact with the surfaces of the two valve plates (4) and is located between the two valve plates (4). A fixing ring (3) with a conical inner wall is fixedly connected to the inner wall of the check valve housing (1). The fixing plate (2) is fixedly connected to the inner wall of the fixing ring (3). The surface of the fixing ring (3) is also in contact with the surfaces of the two valve plates (4). High-temperature resistant rubber pads are fixedly connected to the side of the fixing plate (2) and the fixing ring (3) near the valve plates (4).

3. The adjustable check valve for a flue gas duct according to claim 2, characterized in that: Two limiting plates (9) are fixedly connected to the surfaces of the two valve plates (4), and the two ends of the torsion spring (14) are located between the two sets of limiting plates (9).

4. The adjustable check valve for a flue gas duct according to claim 3, characterized in that: The two mounting shafts (8) are fixedly connected to the surfaces inside the check valve housing (1) with shaped gears (17), and the two shaped gears (17) mesh with each other.

5. The adjustable check valve for a flue gas duct according to claim 4, characterized in that: An electric telescopic rod (7) is fixedly connected to the surface of the check valve housing (1). The output end of the electric telescopic rod (7) is slidably connected to the inside of the check valve housing (1). The electric telescopic rod (7) is electrically connected to the control panel of the external range hood.

6. The adjustable check valve for a flue gas duct according to claim 5, characterized in that: The output end of the electric telescopic rod (7) is fixedly connected to a fan-shaped insert rod (15), and the end of the rotating shaft (10) near the insert rod (15) is fixedly connected to a spiral trapezoidal adjusting rod (16), with the notches of the insert rod (15) and the adjusting rod (16) corresponding to each other.

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