Check valve and smoke exhaust system comprising same

Abstract

The invention discloses a check valve and a smoke exhaust system comprising the check valve, the check valve is arranged in a user side smoke exhaust pipe, the user side smoke exhaust pipe is communicated with a public flue, the check valve further comprises a locking groove, and the locking groove is formed in a first valve plate and a second valve plate and faces one side of the public flue; the locking part is rotationally arranged on the check valve, the first end of the locking part extends into the public flue, the second end of the locking part extends into the check valve, and when the user side smoke exhaust pipe does not exhaust smoke and the public flue exhausts smoke, the locking part rotates, and the second end of the locking part extends into the locking groove; the driving part is connected with the first valve plate and the second valve plate, the locking part comprises a balance block, the driving part is used for driving the balance block to be far away from or close to the check valve, and when the user side smoke exhaust pipe discharges smoke towards the public flue or when the public flue and the user side smoke exhaust pipe discharge smoke at the same time, the driving part drives the balance block to be far away from the check valve and the locking part to rotate; and the second end of the locking part is separated from the locking groove.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and in particular to a check valve and a smoke exhaust system comprising the check valve. Background Art

[0002] As more and more commercial housing enters the city, the public flue in the commercial housing is also an indispensable smoke exhaust environment. Compared with villas and self-built houses, the public flue also has two inherent defects. One is that the resistance of the public flue is relatively large, which has certain requirements on the maximum static pressure performance of the range hood. On the other hand, since the flue is shared, when the neighbors downstairs cook, it will cause the phenomenon of oil smoke backflow, so it is necessary to embed the oil smoke check valve. At present, the check valve on the market mostly adopts double wing flaps in consideration of cost, relying on the gravity closure of the valve plate to prevent the backflow of oil smoke.

[0003] However, the method of closing the exhaust pipe at the user end by the gravity of the valve plate will cause a certain pressure on the valve plate when a large amount of air is generated in the public flue due to the internal and external pressure difference between the public flue and the user end, causing the valve plate to open and oil smoke to flow back. In response to this situation, an elastic member is generally used to tighten the valve plate, or other anti-rotation mechanisms are used to limit the valve plate to prevent oil smoke from flowing back. The above structure will bring a new problem, that is, when the user and the neighbor are cooking at the same time, the valve plate is restricted from rotating and cannot discharge the oil smoke at the user end into the public flue in time, causing the oil smoke to accumulate at the user end, seriously affecting the health of the user.

[0004] Therefore, a check valve capable of solving the above problems is needed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the valve plate with a limiting mechanism cannot be opened in time when there is airflow at the user end and the public flue, and to provide a check valve and a smoke exhaust system including the same.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A check valve, the check valve is arranged in a user-end smoke exhaust pipe, the user-end smoke exhaust pipe is connected to a public flue, the check valve comprises a first valve plate and a second valve plate which are rotatably arranged, and the check valve also comprises:

[0008] A locking groove, which is arranged on the first valve plate and the second valve plate and is arranged toward one side of the common flue;

[0009] A locking part, wherein the locking part is rotatably arranged on the check valve, wherein the first end of the locking part extends into the public flue, and the second end of the locking part extends into the check valve. When the smoke exhaust pipe at the user end does not exhaust smoke but the public flue exhausts smoke, the locking part rotates, and the second end of the locking part extends into the locking groove, and the check valve closes the smoke exhaust pipe at the user end;

[0010] A driving part, wherein the driving part is connected to the first valve plate and the second valve plate, and the locking part includes a balancing block. The driving part is used to drive the balancing block away from or close to the check valve. When the user-end smoke exhaust pipe exhausts smoke toward the common flue, or when the common flue and the user-end smoke exhaust pipe exhaust smoke at the same time, the driving part drives the balancing block away from the check valve, and the locking part rotates, and the second end of the locking part disengages from the locking groove, and the check valve opens the user-end smoke exhaust pipe.

[0011] In this solution, by setting a locking part and a locking groove, when the public flue is exhausting smoke but the user-end exhaust pipe is not exhausting smoke, the user-end exhaust pipe is effectively closed to prevent smoke backflow, and overcome the problem of the valve plate loosening and smoke backflow caused by the pressure difference between the exhaust smoke in the public flue and the exhaust pipe at the user end when the valve plate closes the exhaust pipe at the user end by gravity. In addition, by setting a driving part and a balancing block, when the user-end exhaust pipe is exhausting smoke alone, or when the public flue and the user-end exhaust pipe are exhausting smoke at the same time, that is, on the basis of the locking part and the locking groove effectively closing the user-end exhaust pipe, the user-end exhaust pipe can be unlocked in time, so that the user-end exhaust pipe can be opened in time when the user cooks while being effectively sealed, and overcomes the problem that the user-end exhaust pipe cannot be opened again after being sealed by the original limit structure, and responds faster, thereby preventing smoke from accumulating at the user end and ensuring the health of the user.

[0012] Preferably, the locking portion includes a locking member, a connecting member and a lift plate, the connecting member is rotatably connected to the check valve, the lift plate is arranged at the first end of the connecting member, the lift plate is located in the common flue, the locking groove is located on the outer peripheral side of the connecting member, the locking member is arranged at the second end of the connecting member, and the locking member is arranged from the second end of the connecting member toward the locking groove.

[0013] In this solution, the lift plate contacts the flue gas in the common flue, thereby driving the connecting piece to rotate. When the connecting piece rotates, the locking piece is driven closer to or away from the locking groove to lock or unlock the first valve plate and the second valve plate. The locking groove is located on the outer peripheral side of the connecting piece to avoid interference with the locking groove when the connecting piece rotates, thereby improving the reuse rate.

[0014] Preferably, the locking portion also includes an elastic member, which is arranged between the rotating connection between the connecting member and the check valve and the first end of the connecting member, and when the user-end smoke exhaust pipe is exhausting smoke, or when the common flue and the user-end smoke exhaust pipe are exhausting smoke at the same time, the elastic member provides elastic force for the second end of the locking portion to disengage from the locking groove.

[0015] In this solution, through the above arrangement, when the locking member unlocks the first valve plate and the second valve plate, the elastic member provides an unlocking elastic force to overcome part of the lift force on the lift plate when the common flue and the user-end smoke exhaust pipe are exhausting smoke at the same time.

[0016] Preferably, a first rotating shaft and a second rotating shaft are arranged in parallel in the middle area of ​​the valve mouth of the check valve, the first valve plate is connected to the first rotating shaft, the second valve plate is connected to the second rotating shaft, the locking member, the connecting member and the lift plate are arranged in pairs, and the locking member, the connecting member and the lift plate arranged in pairs are respectively used to lock the first valve plate and the second valve plate.

[0017] In this solution, through the above arrangement, the number of structures such as the locking member corresponds to the number of the first valve plate and the second valve plate, and the first valve plate and the second valve plate are effectively locked or unlocked respectively.

[0018] Preferably, the driving part includes a first gear and a second gear, the first gear is coaxially arranged with the first rotating shaft, the second gear is coaxially arranged with the second rotating shaft, and the first gear and the second gear are meshed with each other.

[0019] In this solution, through the above arrangement, the first valve plate and the second valve plate can be opened or closed at the same time to ensure the efficiency of smoke blocking or exhausting.

[0020] Preferably, the first rotating shaft is connected to the first gear via a spline, and the second rotating shaft is connected to the second gear via a spline.

[0021] In this solution, the above arrangement is used to increase the friction between the rotating shaft and the gear to prevent the rotating shaft from idling.

[0022] Preferably, the balancing block is a screw, which is arranged in pairs and meshes with the first gear and the second gear respectively. When the check valve opens the smoke exhaust pipe at the user end, the first valve plate and the second valve plate drive the first gear and the second gear to rotate, so that the screw moves away from the check valve, and the gravity of the screw drives the connecting piece to rotate toward the common flue.

[0023] In the present scheme, through the above-mentioned arrangement, the gear is threadedly connected with the screw rod, thereby driving the screw rod to move. The screw rod itself has gravity, and the position of gravity changes when the screw rod moves, thereby driving the locking part to rotate to overcome the lift during smoke exhaust from the public flue, thereby unlocking the first valve plate and the second valve plate. After the first valve plate and the second valve plate are locked, they can be opened in time to ensure normal smoke exhaust at the user end, and avoid the situation where the first valve plate and the second valve plate cannot be opened due to the limitation of the limiting structure, resulting in smoke accumulation at the user end when cooking.

[0024] Preferably, the locking portion further includes a bracket, the bracket is connected to the check valve, the bracket is correspondingly arranged at both ends of the screw rod, and the bracket is provided with an accommodating hole for accommodating the end of the screw rod.

[0025] In this solution, a bracket is provided to support the screw rod, so that the screw rod and the connecting member are provided separately, thereby preventing the screw rod from rotating and being separated from the gear when the connecting member rotates.

[0026] Preferably, the first valve plate and the second valve plate are arranged to be inclined from the height direction of the check valve toward the user-end smoke exhaust pipe.

[0027] In this solution, through the above-mentioned setting, the valve plate can rely on its own gravity to close the valve port of the check valve, and there is no need to set up an additional structure to drive the valve plate to close. The mechanical structure is more reliable and has lower cost than other drives, such as motor drive and cylinder drive.

[0028] A smoke exhaust system comprises the check valve as described above.

[0029] In the present solution, the smoke exhaust system includes the above-mentioned check valve to effectively close the user-end smoke exhaust pipe when the public smoke duct is exhausting smoke but the user-end smoke exhaust pipe is not exhausting smoke, so as to prevent smoke backflow; when the user-end smoke exhaust pipe is exhausting smoke alone, or the user-end smoke exhaust pipe and the public smoke duct are exhausting smoke at the same time, the user-end smoke exhaust pipe can also be unlocked in time to avoid smoke accumulation at the user end, thus overcoming the problem that the user-end smoke exhaust pipe cannot be opened again after being sealed by the original limiting structure.

[0030] The positive and progressive effect of the present invention is that the present invention sets a locking part and a locking groove to effectively close the user-end exhaust pipe when the public flue is exhausting smoke and the user-end exhaust pipe is not exhausting smoke, so as to prevent smoke backflow, and overcome the problem of the valve plate loosening and smoke backflow caused by the pressure difference between the exhaust in the public flue and the exhaust pipe at the user end when the valve plate closes the exhaust pipe at the user end by gravity. In addition, by setting a driving part and a balancing block, when the exhaust pipe at the user end is exhausting smoke alone, or when the public flue and the exhaust pipe at the user end are exhausting smoke at the same time, that is, on the basis of the locking part and the locking groove effectively closing the exhaust pipe at the user end, the exhaust pipe at the user end can also be unlocked in time, so that the exhaust pipe at the user end can be opened in time when the user cooks while being effectively sealed, and overcomes the problem that the exhaust pipe at the user end cannot be opened again after the limit structure is set, and the response is faster, thereby preventing smoke from accumulating at the user end and ensuring the health of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a schematic diagram of the valve opening of a check valve according to a preferred embodiment of the present invention.

[0032] Figure 2 The figure is a schematic structural diagram of a check valve according to a preferred embodiment of the present invention.

[0033] Figure 3 It is a structural schematic diagram of a locking portion of a preferred embodiment of the present invention.

[0034] Figure 4 FIG. 1 is a diagram showing the position relationship between the driving part and the balancing weight of a preferred embodiment of the present invention.

[0035] Figure 5 The figure is a schematic diagram of the valve port closure of a check valve according to a preferred embodiment of the present invention.

[0036] Figure 6 It is a schematic diagram of the insertion connection between the locking member and the locking groove according to a preferred embodiment of the present invention.

[0037] Description of reference numerals:

[0038] First valve plate 1

[0039] Second valve plate 2

[0040] Locking groove 3

[0041] Locking part 4

[0042] Balance weight 41

[0043] Locking member 42

[0044] Connector 43

[0045] Lifting plate 44

[0046] Elastic member 45

[0047] Driving unit 5

[0048] First gear 51

[0049] Second gear 52

[0050] First shaft 6

[0051] Second shaft 7

[0052] Bracket 8 DETAILED DESCRIPTION

[0053] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0054] This embodiment provides a check valve, the specific structure is as follows Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the check valve is arranged in a user-end smoke exhaust pipe (not shown in the figure), the user-end smoke exhaust pipe is connected to a public flue (not shown in the figure), the check valve includes a first valve plate 1 and a second valve plate 2 which are rotatably arranged, and the check valve also includes:

[0055] A locking groove 3, which is arranged on the first valve plate 1 and the second valve plate 2 and faces the common flue;

[0056] The locking part 4 is rotatably arranged on the check valve, the first end of the locking part 4 extends into the public flue, and the second end of the locking part 4 extends into the check valve. When the user-end smoke exhaust pipe does not exhaust smoke but the public flue exhausts smoke, the locking part 4 rotates, the second end of the locking part 4 extends into the locking groove 3, and the check valve closes the user-end smoke exhaust pipe;

[0057] The driving part 5 is connected to the first valve plate 1 and the second valve plate 2. The locking part 4 includes a balancing block 41. The driving part 5 is used to drive the balancing block 41 away from or close to the check valve. When the user-end smoke exhaust pipe exhausts smoke toward the public flue, or when the public flue and the user-end smoke exhaust pipe exhaust smoke at the same time, the driving part 5 drives the balancing block 41 away from the check valve, the locking part 4 rotates, and the second end of the locking part 4 disengages from the locking groove 3, and the check valve opens the user-end smoke exhaust pipe.

[0058] Specifically, the check valve includes a valve, and in this embodiment, the valve is a circular hole. Accordingly, the first valve disc 1 and the second valve disc 2 are semicircular plates, so that the valve port can be opened or closed by combining the first valve disc 1 and the second valve disc 2. A locking groove 3 is provided on the first valve disc 1 and the second valve disc 2. Accordingly, a rotatable locking portion 4 is also provided on the check valve, and the second end of the locking portion 4 is provided corresponding to the locking groove 3. Along the height direction of the check valve, the locking portion 4 is located above the first valve disc 1 and the second valve disc 2, and the locking groove 3 is located below the locking portion 4, so that when the locking portion 4 rotates, the second end of the locking portion 4 can extend into or out of the locking groove 3, so as to achieve locking or unlocking of the first valve disc 1 and the second valve disc 2. It can be understood that the middle area of ​​the locking portion 4 is connected to the check valve through a rotating shaft, so as to achieve the rotation of the locking portion 4 relative to the check valve.

[0059] It should be noted that when the public flue is exhausting smoke but the user-end smoke exhaust pipe is not exhausting smoke, the smoke in the public flue has lift, which pushes the first end of the locking part 4 through the lift to rotate the locking part 4, and the second end of the locking part 4 extends into the locking groove 3, and the locking part 4 and the locking groove 3 are plugged into each other to effectively close the user-end smoke exhaust pipe, preventing the smoke in the public flue from flowing back to the user end, and overcoming the problem of the first valve plate 1 and the second valve plate 2 loosening and smoke backflow caused by the pressure difference between the smoke exhaust in the public flue and the airflow in the user-end smoke exhaust pipe when the first valve plate 1 and the second valve plate 2 close the user-end smoke exhaust pipe by gravity.

[0060] In addition, in the present embodiment, the locking portion 4 also includes a balancing block 41, and the balancing block 41 can move in a direction away from or close to the check valve. The balancing block 41 is driven by the driving portion 5, and the position of its own gravity changes with the movement. When the balancing block 41 moves in a direction away from the check valve, the gravity of the balancing block 41 is toward the first end of the locking portion 4, so that the locking portion 4 rotates and the second end of the locking portion 4 disengages from the locking groove 3. Similarly, when the balancing block 41 moves in a direction close to the check valve, the gravity of the balancing block 41 is toward the second end of the locking portion 4, so that the locking portion 4 rotates and the second end of the locking portion 4 extends into the locking groove 3 and is plugged therewith.

[0061] It should be noted that when the user-end smoke exhaust pipe is exhausting smoke alone, or the public flue and the user-end smoke exhaust pipe are exhausting smoke at the same time, the smoke generated by cooking at the user-end needs to be discharged to the public flue, and the first valve plate 1 and the second valve plate 2 have been locked and closed by the locking part 4 and the locking groove 3 without preventing smoke backflow. The smoke in the user-end smoke exhaust pipe pushes the first valve plate 1 and the second valve plate 2, and then drives the driving part 5 connected thereto. The driving part 5 drives the balance block 41 to move in the direction away from the check valve, so that the locking part 4 and the locking groove 3 effectively close the user-end smoke exhaust pipe, so that the locking part 4 rotates, and the second end of the locking part 4 disengages from the locking groove 3, and the user-end smoke exhaust pipe is unlocked in time, so that the user-end smoke exhaust pipe can be effectively sealed and opened in time when the user cooks, overcoming the problem that the user-end smoke exhaust pipe cannot be opened again after being sealed by the original limiting structure, such as a limiting rod or a tension spring, and responds faster, thereby preventing smoke from accumulating at the user end and ensuring the health of the user.

[0062] It can be understood that when the smoke generated by cooking at the user end pushes the first valve plate 1 and the second valve plate 2, compared with the method of detecting the temperature and driving the unlocking through electric drive or hydraulic drive and other structures, the unlocking method in this embodiment adopts a mechanical structure, which has high reliability and will not be affected by the complex temperature of the smoke, and the response is more timely and accurate.

[0063] In this embodiment, the locking portion 4 includes a locking member 42, a connecting member 43 and a lift plate 44. The connecting member 43 is rotatably connected to the check valve, the lift plate 44 is arranged at the first end of the connecting member 43, the lift plate 44 is located in the common flue, the locking groove 3 is located on the outer peripheral side of the connecting member 43, the locking member 42 is arranged at the second end of the connecting member 43, and the locking member 42 is arranged from the second end of the connecting member 43 toward the locking groove 3.

[0064] Specifically, the connector 43 is a bent rod, wherein the first end of the connector 43 is fixedly connected to the lift plate 44 and the lift plate 44 is located in the common flue. The lift plate 44 is a rectangular plate, and the length direction of the lift plate 44 is perpendicular to the extension direction of the common flue, so as to maximize the contact area between the smoke in the common flue and the lift plate 44. The locking member 42 is located at the second end of the connector 43 and is perpendicular to the connector 43. The locking member 42 extends toward the outer peripheral side of the connector 43 and extends in the length direction of the check valve. From the appearance, the locking member 42 and the connector 43 are connected to form an "L"-shaped member. Correspondingly, the locking groove 3 is located on the outer peripheral side of the connector 43, and the slotting direction of the locking groove 3 is set along the height direction of the check valve to avoid interference between the connector 43 and the locking groove 3 when rotating, thereby improving the reuse rate. When the common flue is exhausting smoke, the lift plate 44 is lifted by the smoke to drive the connecting piece 43 to rotate. Correspondingly, the locking piece 42 follows the connecting piece 43 to rotate along the height direction of the check valve and is inserted into the locking groove 3 below the locking part 4 to lock the first valve plate 1 and the second valve plate 2.

[0065] Furthermore, in this embodiment, if Figure 4 As shown, the locking portion 4 also includes an elastic member 45, which is arranged between the rotating connection between the connecting member 43 and the check valve and the first end of the connecting member 43. When the user-end smoke exhaust pipe is exhausting smoke, or when the public flue and the user-end smoke exhaust pipe are exhausting smoke at the same time, the elastic member 45 provides elastic force for the second end of the locking portion 4 to disengage from the locking groove 3.

[0066] Specifically, the elastic member 45 is arranged between the connection part 43 and the rotation connection of the check valve and the first end of the connection part 43. One end of the elastic member 45 is connected to the frame on the check valve, and the other end is connected to the connection part 43. When the locking part 4 locks the first valve plate 1 and the second valve plate 2, the locking part 4 rotates and compresses the elastic member 45, so that the elastic member 45 has the elastic force to drive the connection part 43 to rotate. At this time, the locking member 42 of the locking part 4 is inserted into the locking groove 3, and when the user-end smoke exhaust pipe is exhausting smoke , or when the public flue and the user-end smoke exhaust pipe are exhausting smoke at the same time, the smoke pushes the first valve plate 1 and the second valve plate 2, so that the driving part 5 cooperates with the balance block 41, and the balance block 41 moves toward the first end of the connecting member 43. Under the action of gravity, the partial lift of the lift plate 44 when the public flue and the user-end smoke exhaust pipe are exhausting smoke at the same time is overcome, so that the connecting member 43 rotates. At the same time, the elastic member 45 also provides elastic force to facilitate the rotation of the connecting member 43, that is, the elastic member 45 provides the unlocking elastic force of the locking part 4. Then the valve port of the check valve is opened in time to ensure that when the public flue is exhausting smoke, the user-end smoke exhaust pipe can also exhaust smoke, and overcome the situation where the user end cannot exhaust smoke due to the closing of the check valve by the limit structure to prevent smoke backflow. In this embodiment, the elastic member 45 is a lightweight spring.

[0067] In this embodiment, a first rotating shaft 6 and a second rotating shaft 7 are arranged in parallel in the middle area of ​​the valve mouth of the check valve, the first valve plate 1 is connected to the first rotating shaft 6, the second valve plate 2 is connected to the second rotating shaft 7, the locking member 42, the connecting member 43 and the lift plate 44 are arranged in pairs, and the locking member 42, the connecting member 43 and the lift plate 44 arranged in pairs are respectively used to lock the first valve plate 1 and the second valve plate 2.

[0068] Specifically, along the height direction of the check valve, a symmetry axis is provided in the middle area of ​​the valve port, the first valve disc 1 and the second valve disc 2 are symmetrically arranged along the symmetry axis and are arranged close to each other, the first rotating shaft 6 and the second rotating shaft 7 are also symmetrically arranged along the symmetry axis and are arranged close to each other, the first rotating shaft 6 and the second rotating shaft 7 are rotatably connected with the check valve to realize that the first valve disc 1 and the second valve disc 2 are hinged at the valve port, and correspondingly, the locking grooves 3 on the first valve disc 1 and the second valve disc 2 are also symmetrically arranged along the symmetry axis, and the locking parts 4 are arranged in pairs and correspond to the first valve disc 1 and the second valve disc 2 to lock or unlock the first valve disc 1 and the second valve disc 2. By making the number of locking members 42, connecting members 43 and lifting plates 44 correspond to the number of the first valve disc 1 and the second valve disc 2, the first valve disc 1 and the second valve disc 2 can be effectively locked or unlocked respectively.

[0069] It can be understood that when the first rotating shaft 6 and the second rotating shaft 7 are close to each other, the lift plates 44 arranged in pairs are close to each other and can be combined to form a plate with a larger area, so as to shorten the time for the lift to push the lift plates 44 and then drive the connecting member 43 to rotate when they come into contact with the smoke in the common flue, that is, shorten the response time of the check valve to prevent smoke backflow.

[0070] In this embodiment, the driving part 5 includes a first gear 51 and a second gear 52 . The first gear 51 is coaxially arranged with the first rotating shaft 6 , and the second gear 52 is coaxially arranged with the second rotating shaft 7 . The first gear 51 and the second gear 52 are meshed with each other.

[0071] Specifically, the first gear 51 and the second gear 52 are arranged at one end of the first rotating shaft 6 and the second rotating shaft 7 facing the locking part 4, the first rotating shaft 6 is connected to the first valve plate 1, and the second rotating shaft 7 is connected to the second valve plate 2. The smoke generated by cooking at the user end pushes the first valve plate 1 and the second valve plate 2, so that the first rotating shaft 6 and the second rotating shaft 7 rotate, and the first gear 51 and the second gear 52 are driven to rotate accordingly. The first gear 51 and the second gear 52 are meshed with each other, so that when the amount of smoke is small and pushes the first valve plate 1 or the second valve plate 2, the first valve plate 1 and the second valve plate 2 can be opened at the same time to ensure the smoke exhaust efficiency. Similarly, the first gear 51 and the second gear 52 are meshed with each other, and when the smoke in the public flue pushes the lift plate 44 corresponding to the first valve plate 1 or the second valve plate 2, the first valve plate 1 and the second valve plate 2 can be closed at the same time to ensure the efficiency of smoke blocking.

[0072] In this embodiment, the first rotating shaft 6 is connected to the first gear 51 through a spline, and the second rotating shaft 7 is connected to the second gear 52 through a spline. The spline is a surface treatment in the prior art, and the splines are provided on the first rotating shaft 6 and the second rotating shaft 7 to increase the friction between the first rotating shaft 6 and the first gear 51, and the friction between the second rotating shaft 7 and the second gear 52, so as to prevent the first rotating shaft 6 and the second rotating shaft 7 from idling.

[0073] Of course, in other embodiments, other structures in the prior art for increasing friction may be provided, for example, protrusions and grooves are provided between the gear and the shaft, and the protrusions and grooves are engaged to increase friction. This is the prior art and will not be elaborated on here.

[0074] In this embodiment, the balance block 41 is a screw, which is arranged in pairs and meshes with the first gear 51 and the second gear 52 respectively. When the check valve opens the smoke exhaust pipe at the user end, the first valve plate 1 and the second valve plate 2 drive the first gear 51 and the second gear 52 to rotate, so that the screw moves away from the check valve, and the gravity of the screw drives the connecting piece 43 to rotate toward the common flue.

[0075] Specifically, the balancing blocks 41 are arranged in pairs and are respectively screwed with the first gear 51 and the second gear 52. When the first valve disc 1 and the second valve disc 2 are pushed by the smoke generated by cooking at the user end, the first gear 51 and the second gear 52 are driven to rotate, thereby driving the screw connected thereto to move. The screw itself has gravity, and the position of gravity changes when the screw moves, thereby driving the connecting member 43 of the locking part 4 to rotate. When the first valve disc 1 and the second valve disc 2 are locked by the locking part 4, and when the user end is cooking, the screw moves away from the check valve to overcome the lift when the public flue is exhausted, and the connecting member 43 rotates to unlock the first valve disc 1 and the second valve disc 2. After the first valve disc 1 and the second valve disc 2 are locked, they can be opened in time to ensure normal smoke exhaust at the user end, and avoid the situation that the first valve disc 1 and the second valve disc 2 cannot be opened due to the restriction of the limiting structure, resulting in smoke accumulation at the user end when cooking at the user end.

[0076] In this embodiment, the locking portion 4 further includes a bracket 8, which is connected to the check valve. The bracket 8 is correspondingly arranged at both ends of the screw rod, and a receiving hole for receiving the end of the screw rod is opened on the bracket 8.

[0077] Specifically, the bracket 8 is a plate and extends along the height direction of the check valve. The bracket 8 is located at both ends of the screw. The bracket 8 is provided with a receiving hole, which is a through hole for the screw to pass through. The bracket 8 is provided to support the screw so that the screw and the connecting member 43 are separately provided. In this embodiment, the screw and the connecting member 43 are provided in parallel to save space in the height direction of the locking portion 4. At the same time, when the connecting member 43 rotates, the screw does not rotate with it to avoid the connection member 43 driving the screw to rotate and separate from the first gear 51 or the second gear 52.

[0078] In this embodiment, the first valve plate 1 and the second valve plate 2 are arranged to be inclined from the height direction of the check valve toward the user-end smoke exhaust pipe.

[0079] Specifically, the valve mouth is inclined from the height direction of the check valve toward the user-end smoke exhaust pipe, and the first valve plate 1 and the second valve plate 2 arranged in the valve mouth are similar. Since the first valve plate 1 and the second valve plate 2 have their own gravity, the first valve plate 1 and the second valve plate 2 can rely on their own gravity to close the valve mouth of the check valve on the basis of the inclined setting, so that the first valve plate 1 and the second valve plate 2 do not need to be additionally provided with a driving structure. The first valve plate 1 and the second valve plate 2 rely on gravity to close the valve mouth in the form of a mechanical structure. Compared with other driving structures, such as motor drive and cylinder drive, the mechanical structure is more reliable and has lower cost.

[0080] The present embodiment also provides a smoke exhaust system, which includes the above-mentioned check valve to effectively close the user-end smoke exhaust pipe when the public smoke duct is exhausting smoke but the user-end smoke exhaust pipe is not exhausting smoke, so as to prevent smoke backflow; when the user-end smoke exhaust pipe is exhausting smoke alone, or the user-end smoke exhaust pipe and the public smoke duct are exhausting smoke at the same time, the user-end smoke exhaust pipe can also be unlocked in time to avoid smoke accumulation at the user end, thus overcoming the problem that the user-end smoke exhaust pipe cannot be opened again after being sealed by the original limiting structure.

[0081] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A check valve, the check valve is arranged in a user-end smoke exhaust pipe, the user-end smoke exhaust pipe is connected to a public flue, the check valve comprises a first valve plate and a second valve plate which are rotatably arranged, characterized in that: The check valve also includes: A locking groove, which is arranged on the first valve plate and the second valve plate and is arranged toward one side of the common flue; A locking part, wherein the locking part is rotatably arranged on the check valve, wherein the first end of the locking part extends into the public flue, and the second end of the locking part extends into the check valve. When the smoke exhaust pipe at the user end does not exhaust smoke but the public flue exhausts smoke, the locking part rotates, and the second end of the locking part extends into the locking groove, and the check valve closes the smoke exhaust pipe at the user end; A driving part, wherein the driving part is connected to the first valve plate and the second valve plate, and the locking part includes a balancing block. The driving part is used to drive the balancing block away from or close to the check valve. When the user-end smoke exhaust pipe exhausts smoke toward the common flue, or when the common flue and the user-end smoke exhaust pipe exhaust smoke at the same time, the driving part drives the balancing block away from the check valve, and the locking part rotates, and the second end of the locking part disengages from the locking groove, and the check valve opens the user-end smoke exhaust pipe.

2. The check valve according to claim 1, characterized in that: The locking portion includes a locking member, a connecting member and a lift plate, the connecting member is rotatably connected to the check valve, the lift plate is arranged at the first end of the connecting member, the lift plate is located in the common flue, the locking groove is located on the outer peripheral side of the connecting member, the locking member is arranged at the second end of the connecting member, and the locking member is arranged from the second end of the connecting member toward the locking groove.

3. The check valve according to claim 2, characterized in that: The locking portion also includes an elastic member, which is arranged between the rotating connection between the connecting member and the check valve and the first end of the connecting member. When the user-end smoke exhaust pipe is exhausting smoke, or when the common flue and the user-end smoke exhaust pipe are exhausting smoke at the same time, the elastic member provides elastic force for the second end of the locking portion to disengage from the locking groove.

4. The check valve according to claim 3, characterized in that: A first rotating shaft and a second rotating shaft are arranged in parallel in the middle area of ​​the valve opening of the check valve, the first valve plate is connected to the first rotating shaft, the second valve plate is connected to the second rotating shaft, the locking member, the connecting member and the lift plate are arranged in pairs, and the locking member, the connecting member and the lift plate arranged in pairs are respectively used to lock the first valve plate and the second valve plate.

5. The check valve according to claim 4, characterized in that: The driving part includes a first gear and a second gear, the first gear is coaxially arranged with the first rotating shaft, the second gear is coaxially arranged with the second rotating shaft, and the first gear and the second gear are meshed with each other.

6. The check valve according to claim 5, characterized in that: The first rotating shaft is connected to the first gear via a spline, and the second rotating shaft is connected to the second gear via a spline.

7. The check valve according to claim 5, characterized in that: The balancing block is a screw rod, which is arranged in pairs and meshes with the first gear and the second gear respectively. When the check valve opens the smoke exhaust pipe at the user end, the first valve plate and the second valve plate drive the first gear and the second gear to rotate, so that the screw rod moves away from the check valve, and the gravity of the screw rod drives the connecting piece to rotate toward the common flue.

8. The check valve according to claim 7, characterized in that: The locking portion further includes a bracket, the bracket is connected to the check valve, the bracket is correspondingly arranged at both ends of the screw rod, and the bracket is provided with an accommodating hole for accommodating the end of the screw rod.

9. The check valve according to claim 1, characterized in that: The first valve plate and the second valve plate are arranged to be inclined from the height direction of the check valve toward the user-end smoke exhaust pipe.

10. A smoke exhaust system, characterized in that: The smoke exhaust system comprises a check valve according to any one of claims 1 to 9.

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