Range hood check valve with low wind resistance, low noise and reliable sealing

Abstract

The utility model relates to a range hood check valve with low wind resistance, low noise and reliable sealing, which comprises a valve body (1) and a valve plate (2), a first magnetic suction block (13) is arranged on the valve body (1), a second magnetic suction block (22) matched with the first magnetic suction block (13) is arranged on the valve plate (2), the axial direction of a smoke exhaust hole (11) in the valve body (1) is the horizontal direction when the smoke exhaust hole (11) is installed, and the axial direction of the smoke exhaust hole (11) is the horizontal direction when the smoke exhaust hole (11) is installed. The hinged shaft of the valve plate (2) and the valve body (1) inclines to the vertical installation direction of the valve body (1) by a small angle, the upper side of the hinged shaft (21) is close to the vertical center line of the valve body (1), and the lower side of the hinged shaft (21) is far away from the vertical center line of the valve body (1). Wind power needed for maintaining opening of the valve plate is small, noise is low in the using process, and the sealing effect is good when the valve plate is closed. When the valve is opened, generated wind resistance is small, the valve plate can be opened to the maximum degree more easily, oil smoke can be discharged more easily, and the smoke discharging efficiency of the smoke exhaust ventilator can be guaranteed. The ideal effects of electric energy saving, high oil smoke exhaust efficiency, low noise and good sealing effect can be achieved.

Description

Technical Field

[0001] The utility model relates to an oil fume extractor, in particular to a check valve for an oil fume extractor with low wind resistance, low noise and reliable sealing. Background Art

[0002] An oil fume extractor is a common kitchen appliance, and a check valve is installed on the exhaust port or exhaust duct of the oil fume extractor to prevent the smoke in the flue from flowing back into the room through the oil fume extractor when the oil fume extractor is not working, resulting in the phenomenon of reverse smoke. When the oil fume extractor is turned on, the valve plate of the check valve will be blown open by the wind force of the oil fume extractor, and then the oil fume can be discharged outdoors. The valve plates of the check valves of oil fume extractors are either single valve plates or double valve plates. After the oil fume extractor stops running, some of these valve plates are closed and sealed by gravity, and some are closed and sealed by spring force. The check valves with these two structures have the following defects: First, in order to keep the valve plate in an open state, the wind force consumed by the oil fume extractor to overcome the gravity and spring force of the valve plate is relatively large, so it will affect the smoke exhaust efficiency of the oil fume extractor; Second, the larger the opening degree of the valve plate, the greater the resistance that the wind force needs to overcome for the valve plate to return, so the valve plate cannot be too heavy and the spring force cannot be too large, which will also lead to the sealing force between the valve plate and the check valve body when the valve plate is closed not being large enough, affecting the sealing effect; Third, the continuous blowing of the wind force on the valve plate to keep it in an open state will cause the valve plate to vibrate all the time, and will cause the noise during the smoke exhaust of the oil fume extractor to increase greatly, which is not conducive to reducing the noise in the kitchen and will also make people feel irritable. Summary of the Invention

[0003] The purpose of the utility model is to provide a check valve for an oil fume extractor with low wind resistance, low noise and reliable sealing, which requires less wind force to keep the valve plate open, has low noise during use, and has good sealing effect when closed.

[0004] The technical solution of the utility model is: it includes a valve body with a smoke exhaust hole, a valve plate matching with the smoke exhaust hole is arranged on the smoke outlet side of the valve body, a hinge shaft is arranged at the edge position of the valve plate, a hinge seat matching with the hinge shaft is arranged on the valve body, the hinge shaft on the valve plate is hinged on the valve body in cooperation with the hinge seat, a magnetic attraction block one is arranged at a position on the valve body far from the hinge seat, a magnetic attraction block two matching with the magnetic attraction block one is arranged at a position on the valve plate corresponding to the magnetic attraction block one, the axial direction of the smoke exhaust hole on the valve body during installation is the horizontal direction, the hinge axis of the valve plate and the valve body is inclined at a small angle to the vertical direction of the valve body installation, and the upper side of the hinge shaft is close to the vertical center line of the valve body and the lower side is far from the vertical center line of the valve body, so that the valve plate is both easily blown open by the wind force and can be automatically closed by gravity.

[0005] The technical effects of the present utility model are as follows: It requires a small amount of wind force to keep the valve plate open, has low noise during use, and has good sealing effect when closed. It has small wind resistance when opened, and the valve plate is easier to open to the maximum opening degree, which can reduce the smoke exhaust resistance and energy consumption of the fan, and is more conducive to exhausting oil fumes and ensuring the smoke exhaust efficiency of the range hood. Since the wind resistance after the valve plate is opened is relatively small, the jitter phenomenon of the valve plate will be reduced, and the generated noise will be lower, which is more conducive to a quiet kitchen. After the valve plate is closed, the suction force of the magnet is used to assist the valve plate in sealing, without the need for a complex sealing structure and with guaranteed sealing effect. It overcomes the defect that the existing check valve of the range hood requires a relatively large amount of wind force to keep the valve plate open, and has a simple structure and low cost, achieving the ideal effects of saving electricity, high oil fume exhaust efficiency, low noise and good sealing effect.

[0006] Practice has proved that since the valve plate of this check valve is easily blown open and maintained at the maximum opening degree, the oil fume exhaust is smoother, the valve body and valve plate of the check valve are not easy to accumulate oil dirt, and the service life of the check valve is longer. At the same time, the range hood using this check valve is not easy to accumulate oil dirt, does not need to be cleaned, and can also greatly extend the service life of the range hood. Description of the Drawings

[0007] Figure 1 Three-dimensional view of the valve plate in the closed state of the embodiment of the present utility model;

[0008] Figure 2 Three-dimensional view of the valve plate in the open state of the embodiment of the present utility model. Detailed Implementation Manner

[0009] As Figure 1 、 Figure 2 shown, it includes a valve body 1 having a smoke exhaust hole 11. A valve plate 2 matching the smoke exhaust hole 11 is provided on the smoke outlet side of the valve body 1. A hinge shaft 21 is provided at the edge position of the valve plate 2. A hinge seat 12 matching the hinge shaft 21 is provided on the valve body 1. The hinge shaft 21 on the valve plate 2 is hinged to the valve body 1 in cooperation with the hinge seat 12. A magnetic suction block one 13 is provided at a position on the valve body 1 far from the hinge seat 12. A magnetic suction block two 22 matching the magnetic suction block one 13 is provided at a position on the valve plate 2 corresponding to the magnetic suction block one 13. The axial direction of the smoke exhaust hole 11 on the valve body 1 during installation is the horizontal direction. The hinge axis of the valve plate 2 and the valve body 1 is inclined at a small angle to the vertical direction of the valve body 1 installation, and the upper side of the hinge shaft 21 is close to the vertical center line of the valve body 1, and the lower side is far from the vertical center line of the valve body 1, so that the valve plate 2 is both easily blown open by the wind force and can be automatically closed by gravity.

[0010] The valve body 1 is an annular body with a circular smoke exhaust hole at the center position, and the valve plate 2 is a circular thin sheet body.

[0011] At the edge position of the valve plate 2, two hinge shafts 21 in the same axial direction are provided at an interval. On the valve body 1, two hinge seats 12 respectively cooperating with the two hinge shafts 21 are provided. The two hinge shafts 21 and the valve plate 2 are of an integral structure and protrude beyond the edge of the valve plate 2, and the two hinge seats 12 and the valve body 1 are of an integral structure. An opening groove 14 cooperating with the hinge shaft 21 is provided on the hinge seat 12. The bottom of the opening groove 14 is a hinge shaft hole 15 cooperating with the hinge shaft 21. The width of the notch of the opening groove 14 is smaller than the diameter of the hinge shaft hole 15, so that the hinge shaft 21 can be embedded into the hinge shaft hole 15 on the opening groove 14 to rotate and cooperate with the hinge seat 12, and will not fall off from the hinge seat 12.

[0012] The angle between the axial direction of the hinge shaft 21 of the valve plate 2 and the installation vertical direction of the valve body 1 is 10 to 25 degrees. The optimal angle between the axial direction of the hinge shaft 21 of the valve plate 2 and the installation vertical direction of the valve body 1 is 15 degrees, so that the valve plate 2 is easy to be blown open and can be automatically closed under the action of the gravity of the valve plate 2.

[0013] On the valve body 1, two magnetic attraction blocks one 13 are provided on the radially opposite sides of the smoke exhaust hole 11. On the valve plate 2, two magnetic attraction blocks two 22 respectively cooperating with the two magnetic attraction blocks one 13 are provided. At the positions where the valve body 2 is provided with the two magnetic attraction blocks one 13, there is respectively a suction block seat 16 which is of an integral structure with the valve body 1 and protrudes into the smoke exhaust hole 11. On the side of each suction block seat 16 facing away from the valve plate 2, there is respectively a suction block groove one 17. At the positions where the valve plate 2 is provided with the two magnetic attraction blocks two 22, there is respectively a suction block groove two 23. The magnetic attraction blocks one 13 and the magnetic attraction blocks two 22 are respectively embedded and pasted in the suction block groove one 17 and the suction block groove two 23. The magnetic attraction blocks one 13 and the magnetic attraction blocks two 22 are respectively permanent magnets with NS poles cooperating with each other, or the magnetic attraction block one 13 is a permanent magnet and the magnetic attraction block two 22 is an iron block, or the magnetic attraction block one 13 is an iron sheet and the magnetic attraction block two 22 is a permanent magnet.

[0014] At the peripheral position of the smoke exhaust hole 11 on the side where the valve body 1 is hermetically cooperated with the valve plate 2, there is an annular sealing plane 18 protruding from the valve body 1.

[0015] At the edge positions of the valve body 1 at the upper and lower sides during installation, there are respectively an upper pasting ear 19 and a lower pasting ear 20 protruding outside the valve body 1 for determining the installation direction.

[0016] On the outer side of the valve plate 2 on the smoke exhaust side of the valve body 1, there is an annular sealing plane one 30 cooperating with the periphery of the smoke inlet on the flue. At the inner edge position of the annular sealing plane one 30 on the valve body 1, there is an annular vertical edge 31 protruding from the annular sealing plane one 30 and inserted into the smoke inlet of the flue during installation.

[0017] On the smoke inlet side of the valve body 1, there are a thin smoke exhaust pipe connector 32 and a thick smoke exhaust pipe connector 33 that protrude from the valve body 1 and are located outside the smoke exhaust hole 11. The height at which the thin smoke exhaust pipe connector 32 protrudes outside the valve body 1 is greater than the height at which the thick smoke exhaust pipe connector 33 protrudes outside the valve body 1, so as to facilitate the connection of the thin smoke exhaust pipe.

[0018] Working principle:

[0019] After starting the range hood, the wind force of the range hood will overcome the suction force between the magnetic suction block one 13 and the magnetic suction block two 22, blow open the valve plate 2 to open the check valve. After the distance between the magnetic suction block one 13 and the magnetic suction block two 22 exceeds the effective attraction distance, the valve plate 2 is no longer affected by the magnetic force. Since the hinge shaft 21 on the valve plate 2 is axially inclined at a small angle to the vertical direction, the center of gravity of the valve plate 2 will gradually and slowly rise during the opening process. However, the height difference of the center of gravity between the maximum opening and the closed state is relatively small, so that the self-resetting force of the valve plate 2 is relatively small, and a relatively small wind force can maintain the valve plate 2 at the maximum opening. After turning off the range hood, the valve plate 2 is no longer affected by the wind force, and the valve plate 2 will automatically close by gravity. After reaching the effective attraction distance between the magnetic suction block one 13 and the magnetic suction block two 22, the valve plate 2 will be attracted to the valve body 1 to seal the smoke exhaust hole 11, and the sealing effect is very reliable. It overcomes the defect that the check valve that completely relies on gravity for sealing requires the valve plate to have a certain weight and consumes a large amount of wind force to keep the valve plate open. It also overcomes the defect that the spring type check valve consumes a large amount of wind force when the valve plate opens and the elastic force of the spring is not large enough when it closes. It achieves the goal of requiring a small amount of wind force to maintain the opening of the valve plate and having a good sealing effect when the valve plate closes, and can reduce noise. The use and sealing effect are very ideal, and it solves various problems existing in the check valves of existing range hoods.

Claims

1. A low-drag, low-noise, and reliable-sealing range hood check valve, comprising a valve body (1) having a smoke exhaust hole (11), a valve plate (2) matched with the smoke exhaust hole (11) being provided on the smoke outlet side of the valve body (1), a hinge shaft (21) being provided at the edge of the valve plate (2), a hinge seat (12) matched with the hinge shaft (21) being provided on the valve body (1), the hinge shaft (21) on the valve plate (2) being matched with the hinge seat (12) and being hinged on the valve body (1), characterized in that: A magnetic suction block 1 (13) is provided at a position on the valve body (1) away from the hinge seat (12), and a magnetic suction block 2 (22) matching the magnetic suction block 1 (13) is provided at a position on the valve plate (2) corresponding to the magnetic suction block 1 (13). The axial direction of the smoke exhaust hole (11) on the valve body (1) is horizontal when installed, and the hinge axis of the valve plate (2) and the valve body (1) is inclined at a small angle to the vertical direction of the valve body (1) when installed. The upper side of the hinge axis (21) is close to the vertical center line of the valve body (1) and the lower side is away from the vertical center line of the valve body (1), so that the valve plate (2) can be easily blown open by wind and can be automatically closed by gravity.

2. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 1, characterized in that The valve body (1) is a circular ring-shaped body with a circular smoke exhaust hole at the center, and the valve plate (2) is a circular thin plate-shaped body.

3. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 1, characterized in that Two hinge shafts (21) with the same axial direction are provided at an interval at the edge of the valve plate (2); the valve body (1) is provided with two hinge seats (12) respectively matched with the two hinge shafts (21); the two hinge shafts (21) and the valve plate (2) are an integral structure and protrude beyond the edge of the valve plate (2); the two hinge seats (12) and the valve body (1) are an integral structure.

4. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 3, characterized in that The hinge seat (12) is provided with an open groove (14) matched with the hinge shaft (21), the bottom of the open groove (14) is a hinge shaft hole (15) matched with the hinge shaft (21), and the groove width of the open groove (14) is smaller than the diameter of the hinge shaft hole (15).

5. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 1, characterized in that The axial direction of the hinge axis (21) of the valve plate (2) is inclined at an angle of 10 to 25 degrees relative to the vertical installation direction of the valve body (1).

6. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 5, characterized in that The axial direction of the hinge axis (21) of the valve plate (2) is inclined at an angle of 15 degrees to the vertical installation direction of the valve body (1).

7. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 1, characterized in that The valve body (1) is provided with two magnetic suction blocks (13) respectively located on radially opposite sides of the smoke exhaust hole (11), and the valve plate (2) is provided with magnetic suction blocks (22) respectively matched with the two magnetic suction blocks (13).

8. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 1, characterized in that An annular sealing plane (18) protruding from the valve body (1) is provided at the periphery of the smoke exhaust hole (11) on the side where the valve body (1) and the valve plate (2) are sealed and matched.

9. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 1, characterized in that The valve plate (2) on the smoke exhaust side of the valve body (1) is provided with an annular sealing plane (30) matching the periphery of the smoke inlet on the flue, and the inner edge of the annular sealing plane (30) on the valve body (1) is provided with an annular vertical edge (31) protruding from the annular sealing plane (30) and inserted into the smoke inlet of the flue during installation.

10. The low wind resistance, low noise and reliable sealing check valve for range hoods as claimed in claim 1, characterized in that The smoke inlet side of the valve body (1) is provided with a thin smoke exhaust pipe connector (32) and a thick smoke exhaust pipe connector (33) located outside the smoke exhaust hole (11) and protruding from the valve body (1); the height of the thin smoke exhaust pipe connector (32) protruding outside the valve body (1) is greater than the height of the thick smoke exhaust pipe connector (33) protruding outside the valve body (1).

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