A flue check valve and a flue backflow prevention device comprising the same

Abstract

The utility model belongs to radiator technical field provides a flue check valve and including the flue check valve's flue gas anti back -in device, the flue check valve includes the cylindrical valve body, the cylindrical valve body has a flue gas passage, the cylindrical valve body rotates and is installed with the valve cover subassembly in, the cylindrical valve body is equipped with the drive arrangement for driving the valve cover subassembly to open and close outside, the outer wall fixed mounting of cylindrical valve body has the U type mounting seat, the one side of U type mounting seat away from the cylindrical valve body is installed with the insulating board, and the one side of insulating board away from U type mounting seat is installed with the circuit board, the drive arrangement includes the drive motor, and the drive motor is located the one side of circuit board away from insulating board, and drive motor has a motor output shaft, and the motor output shaft extends to the flue gas passage in proper order and is penetrated circuit board, insulating board, U type mounting seat and cylindrical valve body to the flue gas passage, and is connected with valve cover subassembly fixedly. The utility model has good heat -proof electric conductivity performance, and the equipment failure rate is low, and the service life is long, and greatly reduces the occurrence of safety accidents.

Description

Technical Field

[0001] This utility model relates to the field of backflow preventer technology, and in particular to a flue gas backflow preventer valve and a flue gas backflow prevention device including the flue gas backflow preventer valve. Background Technology

[0002] A flue backflow preventer is a valve installed at the flue opening for use in piping systems, typically in the exhaust ducts of household range hoods. This includes range hood backflow preventers, plastic telescopic flue valves, and flue backflow preventers. A backflow preventer mainly consists of a valve body, a rocker arm, and a valve cover.

[0003] Backflow preventers are crucial in flue systems. Their core function is to prevent backflow of cooking fumes, avoid the accumulation of fumes in the kitchen, isolate odors and harmful gases, and prevent the intrusion of foreign objects and insects. For some well-designed backflow preventers, such as electric backflow preventers, they can also reduce airflow interference in the flue, help fumes be discharged quickly, and reduce exhaust resistance.

[0004] Electric flue backflow preventers are generally equipped with an intelligent control system that can automatically sense the operating status of the range hood and automatically open or close the valve, making it more convenient for users. When the range hood is working, the motor of the electric flue backflow preventer opens the valve cover, allowing the fumes to escape smoothly; when the range hood stops working, the motor of the electric flue backflow preventer closes the valve cover, preventing fumes from flowing back into the kitchen through the flue.

[0005] While current electric flue backflow preventers can work in conjunction with the operating status of the range hood, the following shortcomings have gradually been discovered during use: (1) The drive structure and control system such as motor and circuit board are usually directly installed on the outer wall of the valve body, which is inconvenient to install. Moreover, the valve body temperature is high during operation, which will directly affect the normal operation of the drive structure and control system, resulting in a high failure rate and short service life of the equipment. In addition, the motor is prone to conduction with the valve body, which poses a great safety hazard. (2) When a fire occurs in the range hood, the electric flue backflow preventer cannot detect the fire and automatically close the exhaust duct, thus making it impossible to take timely and effective countermeasures based on the fire. (3) The complex installation structure of the valve cover makes the assembly of the entire electric flue check valve cumbersome, time-consuming and labor-intensive, and cannot effectively ensure that the valve cover is flipped into place, thus failing to ensure the accurate opening and closing of the valve cover. (4) There is an installation gap between the valve cover shaft and the valve body, which makes the valve body airtight. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art as mentioned above, in-depth research was conducted, and after a great deal of creative work, this utility model was completed.

[0007] Specifically, the technical problem to be solved by this utility model is to provide a flue gas backflow prevention valve and a flue gas anti-backflow device including the flue gas backflow prevention valve, so as to solve the technical problems of the current electric flue gas backflow prevention valve structure, which has a high failure rate, short service life and significant safety hazards.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A flue gas backflow preventer includes a cylindrical valve body having a flue gas passage, a valve cover assembly for opening and closing the flue gas passage being rotatably mounted inside the cylindrical valve body, and a drive device for opening and closing the valve cover assembly being provided outside the cylindrical valve body. A U-shaped mounting base is fixedly installed on the outer wall of the cylindrical valve body. An insulating plate is fixedly installed on the side of the U-shaped mounting base away from the cylindrical valve body. A circuit board is fixedly installed on the side of the insulating plate away from the U-shaped mounting base. The driving device includes a drive motor located on the side of the circuit board away from the insulating plate, and the drive motor has a motor output shaft that extends sequentially through the circuit board, the insulating plate, the U-shaped mounting base and the cylindrical valve body into the flue gas passage and is fixedly connected to the valve cover assembly.

[0009] As an improved technical solution, the valve cover assembly includes a valve plate and an annular sealing ring, the annular sealing ring covering the outer edge of the valve plate, and the annular sealing ring having an integrally formed flexible sealing edge that is adapted to the inner diameter of the cylindrical valve body; A rotating shaft is rotatably mounted on the cylindrical valve body. The rotating shaft is correspondingly arranged with the motor output shaft. The valve cover assembly is located between the rotating shaft and the motor output shaft. The motor output shaft and the end of the rotating shaft extending into the flue gas passage are respectively fixedly connected to the valve plate.

[0010] As an improved technical solution, the annular sealing ring has an annular groove that fits the outer edge of the valve plate. The annular sealing ring is sleeved on the valve plate through the annular groove. The valve plate has a plurality of through holes evenly opened along its circumference at its edge position. The annular sealing ring has a plurality of integrally formed connecting posts that are respectively arranged corresponding to the through holes. The connecting posts pass through the through holes. The annular sealing ring is connected to the valve plate through the through holes and the connecting posts. And / or, the annular sealing ring is provided with positioning grooves respectively corresponding to the motor output shaft and the rotating shaft, and the ends of the motor output shaft and the rotating shaft extending into the flue gas channel are both semi-cylindrical structures with planar positioning sides, and the planar positioning sides of the motor output shaft and the rotating shaft are both facing the valve plate; And / or, the annular sealing ring also has an integrally formed marking protrusion, which is located near the motor output shaft.

[0011] As an improved technical solution, the outer wall of the cylindrical valve body is provided with a shaft end sealing cap corresponding to the rotating shaft. The shaft end sealing cap is an integrally formed structure of the cylindrical valve body, and the shaft end sealing cap is sealed to the outer wall of the cylindrical valve body.

[0012] As an improved technical solution, a temperature sensor is fixedly installed on the inner wall of the cylindrical valve body. The temperature sensor is located between the valve cover assembly and the smoke inlet of the cylindrical valve body, and the temperature sensor is positioned close to the circuit board.

[0013] As an improved technical solution, a follower rocker arm is provided between the drive motor and the circuit board. The follower rocker arm includes an integrally formed mounting part, a trigger part, and a pointer part. The mounting part is located between the trigger part and the pointer part, and the mounting part has a fitting hole adapted to the motor output shaft. The follower rocker arm is fitted onto the motor output shaft through the fitting hole. Two microswitches are fixedly installed on the side of the circuit board near the drive motor, and the trigger part is located between the two microswitches.

[0014] As an improved technical solution, the U-shaped mounting base is provided with a plurality of first positioning holes, and the insulating plate is provided with a plurality of first positioning protrusions on the side near the U-shaped mounting base, which are respectively provided with the first positioning holes. The first positioning protrusions are adapted to the first positioning holes, and the insulating plate is positioned and installed on the U-shaped mounting base through the first positioning holes and the first positioning protrusions. And / or, the U-shaped mounting base is provided with a first wire hole corresponding to the temperature sensor, and the insulating plate is provided with a second wire hole corresponding to the first wire hole; And / or, the insulating plate is provided with a plurality of second positioning protrusions on the side near the circuit board, and the circuit board is provided with a plurality of second positioning holes respectively corresponding to the second positioning protrusions. The second positioning holes are adapted to the second positioning protrusions, and the circuit board is positioned and installed on the insulating plate through the second positioning holes and the second positioning protrusions. And / or, the insulating plate is provided with mounting posts and positioning posts on the side near the circuit board, and there are at least two sets of mounting posts and positioning posts. The circuit board is provided with a clearance groove for the mounting posts and positioning posts to avoid each other. The mounting posts and positioning posts pass through the circuit board through the clearance groove. The drive motor has an integrally formed mounting ear. The mounting ear is provided with a third mounting hole corresponding to the mounting post and a third positioning hole corresponding to the positioning post. And / or, the U-shaped mounting base has a first clearance hole corresponding to the motor output shaft, the insulating plate has a second clearance hole corresponding to the motor output shaft, and the circuit board has a third clearance hole corresponding to the motor output shaft.

[0015] As an improved technical solution, the cylindrical valve body has several integrally formed reinforcing ribs, and the several reinforcing ribs are arranged along the axial direction of the cylindrical valve body; And / or, the cylindrical valve body is provided with a protective cover covering the insulating plate, the circuit board and the drive motor. The U-shaped mounting base has a plurality of snap-fit ​​slots. The protective cover has a plurality of snap-fit ​​protrusions respectively provided corresponding to the snap-fit ​​slots. The protective cover is detachably installed on the U-shaped mounting base through the snap-fit ​​protrusions and the snap-fit ​​slots. A wiring clearance groove is provided on one side of the protective cover. The top of the protective cover is provided with a clearance part for realizing the swing clearance of the pointer part.

[0016] This utility model also discloses a flue gas backflow prevention device, including the flue gas anti-backflow valve as described above, and also includes a mounting base and a flue gas connecting cylinder. The mounting base and the flue gas connecting cylinder are respectively installed at the flue gas inlet end and the flue gas outlet end of the cylindrical valve body.

[0017] As an improved technical solution, the mounting base has a connecting cylinder, the inner diameter of which is adapted to the outer diameter of the cylindrical valve body, and the bottom of the mounting base is provided with a plurality of valve body support plates, which are evenly arranged along the circumference of the connecting cylinder, and one end of the valve body support plate extends to the inner side of the connecting cylinder. The cylindrical valve body is mounted on the mounting base through the connecting cylinder and the valve body support plate, and the cylindrical valve body is disposed against the valve body support plate. And / or, the flue connecting cylinder has a first annular snap-fit ​​groove adapted to the cylindrical valve body at one end near the cylindrical valve body, and the flue connecting cylinder is installed on the cylindrical valve body through the first annular snap-fit ​​groove. The other end of the flue connecting cylinder has a second annular snap-fit ​​groove adapted to the flue pipe opening. The inner wall of the flue connecting cylinder has an integrally formed flue baffle and a support limiting piece. There are a plurality of support limiting pieces, and the plurality of support limiting pieces are evenly arranged along the circumference of the flue connecting cylinder.

[0018] After adopting the above technical solution, the beneficial effects of this utility model are: This flue gas check valve uses a drive motor to rotate the valve cover assembly. When the drive motor opens the valve cover assembly, fumes can be smoothly discharged through the flue gas channel. When the drive motor closes the valve cover assembly, the flue gas channel is blocked by the valve cover assembly, preventing fumes from flowing back into the flue gas channel. Furthermore, the U-shaped mounting base and insulating plate of this flue gas check valve facilitate the installation of the circuit board and drive motor, while significantly reducing the heat conduction effect of the cylindrical valve body. This greatly reduces the impact of the cylindrical valve body temperature on the drive motor, circuit board, and components on the circuit board, ensuring the normal operation of the drive system and control system components, reducing equipment failure rate, and extending equipment lifespan. The insulating plate effectively prevents electrical conduction between the drive motor and the cylindrical valve body, thus significantly reducing the occurrence of safety accidents.

[0019] This backflow prevention device facilitates the installation and use of the flue backflow preventer in the flue system through the mounting base and flue connection cylinder, providing convenience for the installation and connection of the flue backflow preventer. This backflow prevention device can work according to the operating status of the range hood, helping to quickly exhaust the fumes and preventing the fumes from flowing back into the kitchen from the flue. It is also highly safe to use, has a low failure rate, and a long service life. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a three-dimensional structural diagram of the flue gas anti-backflow valve of this utility model; Figure 2 This is another three-dimensional structural diagram of the flue gas anti-reverse valve of this utility model; Figure 3 This is another three-dimensional structural diagram of the flue gas anti-backflow valve of this utility model; Figure 4This is a schematic diagram of the exploded structure of the flue gas backflow preventer valve of this utility model; Figure 5 This is a schematic diagram of the installation structure of the U-shaped mounting base on the cylindrical valve body of this utility model; Figure 6 This is a schematic diagram of the valve cover assembly of this utility model; Figure 7 This is an exploded structural diagram of the valve cover assembly of this utility model; Figure 8 This is a schematic diagram of the assembly structure of the U-shaped mounting base, insulating plate, circuit board and drive motor of this utility model; Figure 9 This is an exploded structural diagram of the U-shaped mounting base, insulating plate, circuit board, and drive motor of this utility model; Figure 10 This is a schematic diagram of the mating and installation structure of the U-shaped mounting base, insulating plate, and circuit board of this utility model; Figure 11 This is a schematic diagram of the structure of the U-shaped mounting base of this utility model; Figure 12 This is a three-dimensional structural diagram of the insulating board of this utility model; Figure 13 This is another three-dimensional structural diagram of the insulating board of this utility model; Figure 14 This is a schematic diagram of the mounting structure of the micro switch on the circuit board of this utility model; Figure 15 This is a schematic diagram of the drive motor of this utility model; Figure 16 This is a schematic diagram of the structure of the follower swing arm of this utility model; Figure 17 This is a schematic diagram of the structure of the protective cover of this utility model; Figure 18 This is a three-dimensional structural diagram of the flue gas backflow prevention device of this utility model; Figure 19 This is another three-dimensional structural diagram of the flue gas backflow prevention device of this utility model; Figure 20 This is a schematic diagram of the exploded structure of the flue gas backflow prevention device of this utility model; Figure 21 This is a cross-sectional structural diagram of the flue gas backflow prevention device of this utility model; Figure 22 This is a schematic diagram of the structure of the mounting base of this utility model; Figure 23 This is a schematic diagram of the structure of the flue connecting cylinder of this utility model; Figure label: 1-Cylindrical valve body; 101-Reinforcing rib; 2-Valve plate; 201-Through hole; 202-First mounting hole; 3-Annular sealing ring; 301-Flexible sealing edge; 302-Positioning groove; 303-Identification protrusion; 304-Second mounting hole; 4-U-shaped mounting base; 401-First positioning hole; 402-First wire guide hole; 403-First clearance hole; 404-Mounting slot; 5-Insulating plate; 501-First positioning protrusion; 502-Second wire hole; 503-Second positioning protrusion; 504-Mounting post; 505-Positioning post; 506-Second clearance hole; 6-Circuit board; 601-Second positioning hole; 602-Allowing groove; 603-Third clearance hole; 7-Drive motor; 701-Mounting ear; 7011-Third mounting hole; 7012-Third positioning hole; 8-Motor output shaft; 9-Rotating shaft; 10-Shaft end sealing cap; 11-Temperature sensor; 12-Follow-up rocker arm; 1201-Mounting part; 12011-Fitting hole; 1202-Trigger part; 1203-Pointer part; 13-Micro switch; 14-Protective cover; 1401-Snap-fit ​​protrusion; 1402-Wiring clearance groove; 1403-Clearing part; 15-Mounting base; 1501-Connecting cylinder; 1502-Valve body support plate; 16-Fluorise connecting cylinder; 1601-First annular snap-fit ​​groove; 1602-Second annular snap-fit ​​groove; 1603-Fluorise baffle; 1604-Supporting and limiting piece. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0025] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] like Figures 1 to 17 As shown in the figure, this embodiment provides a flue gas backflow preventer, including a cylindrical valve body 1. The cylindrical valve body 1 has a flue gas passage for oil fumes to pass through. A valve cover assembly for opening and closing the flue gas passage is rotatably installed inside the cylindrical valve body 1. A driving device for opening and closing the valve cover assembly is provided outside the cylindrical valve body 1. When the valve cover assembly is open, oil fumes can be discharged from the flue gas passage. When the valve cover assembly is closed, oil fumes can be prevented from flowing back into the flue gas passage.

[0027] like Figures 1 to 15 As shown, a U-shaped mounting base 4 is fixedly installed on the outer wall of the cylindrical valve body 1. The U-shaped mounting base 4 is a bent metal plate structure, and there is a heat insulation gap between the U-shaped mounting base 4 and the outer wall of the cylindrical valve body 1. An insulating plate 5 is fixedly installed on the side of the U-shaped mounting base 4 away from the cylindrical valve body 1, and a circuit board 6 is fixedly installed on the side of the insulating plate 5 away from the U-shaped mounting base 4. The driving device includes a drive motor 7, which is located on the side of the circuit board 6 away from the insulating plate 5. The drive motor 7 has a motor output shaft 8, which extends through the circuit board 6, the insulating plate 5, the U-shaped mounting base 4 and the cylindrical valve body 1 in sequence into the flue gas passage and is fixedly connected to the valve cover assembly.

[0028] The flue gas anti-backflow valve uses a drive motor 7 to rotate the valve cover assembly. When the drive motor 7 drives the valve cover assembly to the open state, the fumes can be smoothly discharged through the flue gas channel. When the drive motor 7 drives the valve cover assembly to the closed state, the flue gas channel is blocked by the valve cover assembly, which can prevent the fumes from flowing back into the flue gas channel.

[0029] The flue gas check valve is equipped with a U-shaped mounting base 4 and an insulating plate 5, which facilitates the installation of the circuit board 6 and the drive motor 7. At the same time, it can greatly reduce the heat conduction effect of the cylindrical valve body 1, thereby greatly reducing the impact of the temperature of the cylindrical valve body 1 on the drive motor 7, the circuit board 6 and the components on the circuit board 6, ensuring the normal operation of the drive system and the control system components, reducing the equipment failure rate, and extending the service life of the equipment. The insulating plate 5 can effectively prevent electrical conduction between the drive motor 7 and the cylindrical valve body 1, thereby greatly reducing the occurrence of safety accidents.

[0030] In one embodiment, such as Figures 1 to 4 , Figure 6 and Figure 7 As shown, the valve cover assembly includes a valve plate 2 and an annular sealing ring 3. The annular sealing ring 3 covers the outer edge of the valve plate 2, and the annular sealing ring 3 has an integrally formed flexible sealing edge 301 that is adapted to the inner diameter of the cylindrical valve body 1. When the valve cover assembly is in the closed state, the flexible sealing edge 301 can fit tightly against the inner wall of the cylindrical valve body 1, so that the valve cover assembly and the cylindrical valve body 1 have good sealing performance, thereby effectively preventing oil fumes from flowing back into the flue channel.

[0031] In one embodiment, such as Figures 1 to 4 , Figure 6 and Figure 7 As shown, to enable the valve cover assembly to be rotatably mounted within the cylindrical valve body 1, a rotating shaft 9 is rotatably mounted on the cylindrical valve body 1. The rotating shaft 9 is correspondingly positioned with the motor output shaft 8. The valve cover assembly is located between the rotating shaft 9 and the motor output shaft 8, and the ends of the motor output shaft 8 and the rotating shaft 9 extending into the flue gas passage are respectively fixedly connected to the valve plate 2. The drive motor 7 operates, driving the valve cover assembly to rotate via the motor output shaft 8, thereby opening and closing the valve cover assembly.

[0032] In one embodiment, such as Figures 1 to 4 , Figure 6 and Figure 7 As shown, to achieve the installation and connection between the annular sealing ring 3 and the valve plate 2, the annular sealing ring 3 has an annular groove that matches the outer edge of the valve plate 2. The annular sealing ring 3 is sleeved on the valve plate 2 through the annular groove, and several through holes 201 are evenly opened along the circumference of the edge of the valve plate 2. The annular sealing ring 3 has several integrally formed connecting posts that are respectively arranged corresponding to the through holes 201. The connecting posts pass through the through holes 201, and the annular sealing ring 3 is connected to the valve plate 2 through the through holes 201 and the connecting posts. The valve cover assembly can be prepared by placing the valve plate 2 in an injection mold. The preparation operation is simple and convenient, and the connection between the annular sealing ring 3 and the valve plate 2 is firm and reliable.

[0033] In one embodiment, such as Figures 1 to 4 , Figure 6 and Figure 7As shown, to facilitate precise and rapid assembly and connection of the rotating shaft 9 and the motor output shaft 8 with the valve cover assembly, the annular sealing ring 3 is provided with positioning grooves 302 respectively corresponding to the motor output shaft 8 and the rotating shaft 9. The positioning grooves 302 realize the positioning and limiting of the motor output shaft 8 and the rotating shaft 9. The end of the motor output shaft 8 and the rotating shaft 9 extending into the flue gas channel is a semi-cylindrical structure with a planar positioning side, and the planar positioning side of the motor output shaft 8 and the rotating shaft 9 are both set towards the valve plate 2, which can ensure that the installation of the motor output shaft 8 and the rotating shaft 9 is firm and reliable.

[0034] In one embodiment, such as Figure 1 , Figure 4 , Figure 6 and Figure 7 As shown, the annular sealing ring 3 also has an integrally formed marking protrusion 303, which is located near the motor output shaft 8. The marking protrusion 303 is used to help the operator correctly identify the installation orientation of the valve cover assembly. When assembling and installing the valve cover assembly inside the cylindrical valve body 1, the position of the marking protrusion 303 on the valve cover assembly is aligned with the motor output shaft 8, which can avoid incorrect installation of the valve cover assembly and make the assembly and installation of the valve cover assembly accurate and fast.

[0035] In one embodiment, such as Figure 6 and Figure 7 As shown, the valve plate 2 has a first mounting hole 202, and the annular sealing ring 3 has a second mounting hole 304 at the positioning groove 302 position, which is respectively provided with the first mounting hole 202. The motor output shaft 8 and the rotating shaft 9 are fixedly connected to the valve plate 2 by mounting bolts passing through the first mounting hole 202 and the second mounting hole 304.

[0036] In one embodiment, such as Figure 1 and Figure 2 As shown, the outer wall of the cylindrical valve body 1 is provided with a shaft end sealing cap 10 corresponding to the rotating shaft 9. The shaft end sealing cap 10 is an integrally formed structure of the cylindrical valve body 1, and the shaft end sealing cap 10 is sealed to the outer wall of the cylindrical valve body 1. When installing the rotating shaft 9, the mounting end of the rotating shaft 9 is placed against the shaft end sealing cap 10, and then the connecting end of the rotating shaft 9 is connected and fixed to the valve cover assembly. The shaft end sealing cap 10 facilitates the installation of the rotating shaft 9 and effectively prevents oil fume leakage from the flue gas passage.

[0037] In one embodiment, such as Figure 2 As shown, a temperature sensor 11 is fixedly installed on the inner wall of the cylindrical valve body 1. The temperature sensor 11 is located between the valve cover assembly and the flue gas inlet of the cylindrical valve body 1, and the temperature sensor 11 is set close to the circuit board 6. The temperature sensor 11 is used to realize the real-time detection of the temperature in the flue gas channel.

[0038] In one embodiment, the temperature sensor 11 is a ceramic temperature sensor 11, which can operate stably in a temperature range of -40°C to +200°C and has excellent characteristics of high temperature resistance and fire resistance.

[0039] During operation, the temperature sensor 11 detects the temperature inside the flue gas duct in real time. When a fire occurs in the range hood, the flame enters the flue gas duct, causing the temperature inside the flue gas duct to rise. When the temperature inside the flue gas duct reaches the set value of the temperature sensor 11, the temperature sensor 11 feeds back the detection signal to the control system. The control system controls the drive motor 7 to work, drives the valve cover assembly to close, and blocks the flue gas duct to achieve safety protection.

[0040] In one embodiment, such as Figure 3 , Figure 4 , Figures 8 to 10 , Figures 14 to 16 As shown, a follower rocker arm 12 is provided between the drive motor 7 and the circuit board 6. The follower rocker arm 12 includes an integrally formed mounting part 1201, a trigger part 1202, and a pointer part 1203. The mounting part 1201 is located between the trigger part 1202 and the pointer part 1203, and the mounting part 1201 has a fitting hole 12011 adapted to the motor output shaft 8. The follower rocker arm 12 is fitted onto the motor output shaft 8 through the fitting hole 12011. Two microswitches 13 are fixedly installed on the side of the circuit board 6 near the drive motor 7, and the trigger part 1202 is located between the two microswitches 13. When the drive motor 7 drives the valve cover assembly to flip, the follower rocker arm 12 swings synchronously with the motor output shaft 8. When the valve cover assembly flips to the closed state, the trigger part 1202 abuts against one of the micro switches 13. The micro switch 13 feeds a signal back to the control system, which controls the drive motor 7 to stop working, ensuring that the valve cover assembly stops accurately. When the valve cover assembly flips to the open state, the trigger part 1202 abuts against the other micro switch 13. The micro switch 13 feeds a signal back to the control system, which controls the drive motor 7 to stop working, ensuring that the valve cover assembly stops accurately. The pointer part 1203 allows the operator to intuitively understand the opening and closing status of the valve cover assembly. Through the follower rocker arm 12 and the micro switch 13, the valve cover assembly can be effectively ensured to flip into place, thereby ensuring the accurate opening and closing of the valve cover assembly.

[0041] In one embodiment, such as Figure 11 and Figure 13As shown, in order to facilitate the quick and accurate installation of the insulating plate 5 on the U-shaped mounting base 4, the U-shaped mounting base 4 is provided with a number of first positioning holes 401. The side of the insulating plate 5 near the U-shaped mounting base 4 is provided with a number of first positioning protrusions 501 respectively corresponding to the first positioning holes 401. The first positioning protrusions 501 are adapted to the first positioning holes 401. The insulating plate 5 is positioned and installed on the U-shaped mounting base 4 through the first positioning holes 401 and the first positioning protrusions 501, which makes the assembly and installation of the insulating plate 5 simple and convenient, and greatly improves the assembly efficiency of the insulating plate 5.

[0042] In one embodiment, such as Figure 8 , Figure 9 , Figures 11 to 13 As shown, the U-shaped mounting base 4 has a first wire hole 402 corresponding to the temperature sensor 11, and the insulating plate 5 has a second wire hole 502 corresponding to the first wire hole 402; the first wire hole 402 and the second wire hole 502 facilitate the wire connection between the circuit board 6 and the temperature sensor 11.

[0043] In one embodiment, such as Figure 9 , Figure 10 , Figure 12 and Figure 14 As shown, to facilitate the rapid and accurate installation of the circuit board 6 on the insulating plate 5, the insulating plate 5 is provided with a number of second positioning protrusions 503 on the side near the circuit board 6. The circuit board 6 is provided with a number of second positioning holes 601 respectively corresponding to the second positioning protrusions 503. The second positioning holes 601 are adapted to the second positioning protrusions 503. The circuit board 6 is positioned and installed on the insulating plate 5 through the second positioning holes 601 and the second positioning protrusions 503, which makes the assembly and installation of the circuit board 6 simple and convenient, and greatly improves the assembly efficiency of the circuit board 6.

[0044] In one embodiment, such as Figure 3 , Figure 4 , Figures 8 to 10 , Figures 12 to 15As shown, the insulating plate 5 has a mounting post 504 and a positioning post 505 on the side near the circuit board 6. There are at least two sets of mounting posts 504 and positioning posts 505. The circuit board 6 has a clearance groove 602 for the mounting posts 504 and positioning posts 505 to avoid each other. The mounting posts 504 and positioning posts 505 pass through the circuit board 6 through the clearance groove 602. The drive motor 7 has an integrally formed mounting ear 701. The mounting ear 701 has a third mounting hole 7011 corresponding to the mounting post 504 and a third positioning hole 7012 corresponding to the positioning post 505. The positioning post 505 and the third positioning hole 7012 facilitate the quick and accurate installation of the drive motor 7. The mounting post 504 and the third mounting hole 7011 facilitate the fixing of the drive motor 7 with mounting bolts, making the assembly operation of the drive motor 7 simple and convenient, and greatly improving the assembly efficiency of the drive motor 7.

[0045] In one embodiment, such as Figures 8 to 14 As shown, the U-shaped mounting base 4 has a first clearance hole 403 corresponding to the motor output shaft 8, the insulating plate 5 has a second clearance hole 506 corresponding to the motor output shaft 8, and the circuit board 6 has a third clearance hole 603 corresponding to the motor output shaft 8. The motor output shaft 8 passes through the circuit board 6, the insulating plate 5, and the U-shaped mounting base 4 in sequence through the third clearance hole 603, the second clearance hole 506, and the first clearance hole 403.

[0046] In one embodiment, such as Figure 12 and Figure 13 As shown, the first positioning protrusion 501, the second positioning protrusion 503, the mounting post 504 and the positioning post 505 are all integrally formed structures of the insulating plate 5, with high structural strength.

[0047] In one embodiment, such as Figures 1 to 5 As shown, the cylindrical valve body 1 has a number of integrally formed reinforcing ribs 101, which are arranged along the axial direction of the cylindrical valve body 1. The presence of these reinforcing ribs 101 greatly improves the structural strength of the cylindrical valve body 1, making the cylindrical valve body 1 sturdy, firm, and not easily deformed.

[0048] In one embodiment, such as Figure 1 , Figure 2 , Figure 4 and Figure 17 As shown, the cylindrical valve body 1 is provided with a protective cover 14 covering the insulating plate 5, the circuit board 6 and the drive motor 7. The protective cover 14 provides safety protection for the drive system and the control system.

[0049] In one embodiment, such as Figure 1 , Figure 2 , Figure 4 , Figures 8 to 11 , Figure 17As shown, to facilitate the installation of the protective cover 14, the U-shaped mounting base 4 has several snap-fit ​​slots 404, and the protective cover 14 has several snap-fit ​​protrusions 1401 respectively corresponding to the snap-fit ​​slots 404. The protective cover 14 is detachably installed on the U-shaped mounting base 4 through the snap-fit ​​protrusions 1401 and the snap-fit ​​slots 404. A wiring clearance groove 1402 is provided on one side of the protective cover 14 to facilitate wire threading. The top of the protective cover 14 is provided with a clearance part 1403 to allow the pointer part 1203 to swing and avoid the pointer part 1203. The clearance part 1403 allows the pointer part 1203 to swing and avoid the pointer part 1203.

[0050] like Figures 1 to 23 As shown in the figure, this embodiment also discloses a flue gas backflow prevention device, including the flue gas anti-backflow valve as described above, and also including a mounting base 15 and a flue gas connecting cylinder 16. The mounting base 15 and the flue gas connecting cylinder 16 are respectively installed at the flue gas inlet end and the flue gas outlet end of the cylindrical valve body 1.

[0051] In one embodiment, such as Figures 18 to 22 As shown, the mounting base 15 has a connecting cylinder 1501, which is an integrally formed structure of the mounting base 15. The inner diameter of the connecting cylinder 1501 is adapted to the outer diameter of the cylindrical valve body 1. The bottom of the mounting base 15 is provided with several valve body support plates 1502, which are evenly arranged along the circumference of the connecting cylinder 1501. One end of each valve body support plate 1502 extends to the inner side of the connecting cylinder 1501. The cylindrical valve body 1 is mounted on the mounting base 15 via the connecting cylinder 1501 and the valve body support plates 1502, and the cylindrical valve body 1 is positioned against the valve body support plates 1502. This mounting base 15 facilitates the installation of the flue gas check valve in the flue gas system.

[0052] In one embodiment, such as Figures 18 to 21 , Figure 23 As shown, the flue connecting cylinder 16 has a first annular snap-fit ​​groove 1601 adapted to the cylindrical valve body 1 at one end near the cylindrical valve body 1. The flue connecting cylinder 16 is installed on the cylindrical valve body 1 through the first annular snap-fit ​​groove 1601. The other end of the flue connecting cylinder 16 has a second annular snap-fit ​​groove 1602 adapted to the flue pipe opening. The inner wall of the flue connecting cylinder 16 has an integrally formed flue baffle 1603 and a support limiting piece 1604. Several support limiting pieces 1604 are provided, and the several support limiting pieces 1604 are evenly arranged along the circumference of the flue connecting cylinder 16. The flue baffle 1603 and the support limiting piece 1604 provided in the flue connecting cylinder 16 facilitate the insertion connection with flue gas pipes of different diameters.

[0053] This backflow prevention device facilitates the installation and use of the flue backflow preventer in the flue system through the mounting base 15 and flue connecting cylinder 16, providing convenience for the installation and connection of the flue backflow preventer. This backflow prevention device can work according to the operating status of the range hood, helping to quickly exhaust fumes and preventing fumes from flowing back into the kitchen from the flue. It is also highly safe to use, has a low failure rate, and a long service life.

[0054] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A flue gas backflow preventer, characterized in that, The device includes a cylindrical valve body having a flue gas passage, a valve cover assembly for opening and closing the flue gas passage being rotatably mounted inside the cylindrical valve body, and a drive device for opening and closing the valve cover assembly being provided outside the cylindrical valve body. A U-shaped mounting base is fixedly installed on the outer wall of the cylindrical valve body. An insulating plate is fixedly installed on the side of the U-shaped mounting base away from the cylindrical valve body. A circuit board is fixedly installed on the side of the insulating plate away from the U-shaped mounting base. The driving device includes a drive motor located on the side of the circuit board away from the insulating plate, and the drive motor has a motor output shaft that extends sequentially through the circuit board, the insulating plate, the U-shaped mounting base and the cylindrical valve body into the flue gas passage and is fixedly connected to the valve cover assembly.

2. The flue gas backflow preventer valve according to claim 1, characterized in that, The valve cover assembly includes a valve plate and an annular sealing ring. The annular sealing ring covers the outer edge of the valve plate and has an integrally formed flexible sealing edge that is adapted to the inner diameter of the cylindrical valve body. A rotating shaft is rotatably mounted on the cylindrical valve body. The rotating shaft is correspondingly arranged with the motor output shaft. The valve cover assembly is located between the rotating shaft and the motor output shaft. The motor output shaft and the end of the rotating shaft extending into the flue gas passage are respectively fixedly connected to the valve plate.

3. The flue gas check valve according to claim 2, characterized in that, The annular sealing ring has an annular groove that fits the outer edge of the valve plate. The annular sealing ring is sleeved on the valve plate through the annular groove. The valve plate has a plurality of through holes evenly distributed around its circumference at its edge position. The annular sealing ring has a plurality of integrally formed connecting posts that are respectively arranged corresponding to the through holes. The connecting posts pass through the through holes. The annular sealing ring is connected to the valve plate through the through holes and the connecting posts. And / or, the annular sealing ring is provided with positioning grooves respectively corresponding to the motor output shaft and the rotating shaft, and the ends of the motor output shaft and the rotating shaft extending into the flue gas channel are both semi-cylindrical structures with planar positioning sides, and the planar positioning sides of the motor output shaft and the rotating shaft are both facing the valve plate; And / or, the annular sealing ring also has an integrally formed marking protrusion, which is located near the motor output shaft.

4. The flue gas check valve according to claim 2, characterized in that, The outer wall of the cylindrical valve body is provided with a shaft end sealing cap corresponding to the rotating shaft. The shaft end sealing cap is an integrally formed structure of the cylindrical valve body, and the shaft end sealing cap is sealed to the outer wall of the cylindrical valve body.

5. The flue gas check valve according to any one of claims 1-4, characterized in that, A temperature sensor is fixedly installed on the inner wall of the cylindrical valve body. The temperature sensor is located between the valve cover assembly and the smoke inlet of the cylindrical valve body, and the temperature sensor is positioned close to the circuit board.

6. The flue gas check valve according to claim 5, characterized in that, A follower rocker arm is provided between the drive motor and the circuit board. The follower rocker arm includes an integrally formed mounting part, a trigger part, and a pointer part. The mounting part is located between the trigger part and the pointer part, and the mounting part has a fitting hole adapted to the output shaft of the motor. The follower rocker arm is fitted onto the output shaft of the motor through the fitting hole. Two microswitches are fixedly installed on the side of the circuit board near the drive motor, and the trigger part is located between the two microswitches.

7. The flue gas check valve according to claim 6, characterized in that, The U-shaped mounting base has a plurality of first positioning holes, and the insulating plate has a plurality of first positioning protrusions on the side near the U-shaped mounting base that are respectively provided with the first positioning holes. The first positioning protrusions are adapted to the first positioning holes, and the insulating plate is positioned and installed on the U-shaped mounting base through the first positioning holes and the first positioning protrusions. And / or, the U-shaped mounting base is provided with a first wire hole corresponding to the temperature sensor, and the insulating plate is provided with a second wire hole corresponding to the first wire hole; And / or, the insulating plate is provided with a plurality of second positioning protrusions on the side near the circuit board, and the circuit board is provided with a plurality of second positioning holes respectively corresponding to the second positioning protrusions. The second positioning holes are adapted to the second positioning protrusions, and the circuit board is positioned and installed on the insulating plate through the second positioning holes and the second positioning protrusions. And / or, the insulating plate is provided with mounting posts and positioning posts on the side near the circuit board, and there are at least two sets of mounting posts and positioning posts. The circuit board is provided with a clearance groove for the mounting posts and positioning posts to avoid each other. The mounting posts and positioning posts pass through the circuit board through the clearance groove. The drive motor has an integrally formed mounting ear. The mounting ear is provided with a third mounting hole corresponding to the mounting post and a third positioning hole corresponding to the positioning post. And / or, the U-shaped mounting base has a first clearance hole corresponding to the motor output shaft, the insulating plate has a second clearance hole corresponding to the motor output shaft, and the circuit board has a third clearance hole corresponding to the motor output shaft.

8. The flue gas check valve according to claim 7, characterized in that, The cylindrical valve body has several integrally formed reinforcing ribs, and the several reinforcing ribs are arranged along the axial direction of the cylindrical valve body; And / or, the cylindrical valve body is provided with a protective cover covering the insulating plate, the circuit board and the drive motor. The U-shaped mounting base has a plurality of snap-fit ​​slots. The protective cover has a plurality of snap-fit ​​protrusions respectively provided corresponding to the snap-fit ​​slots. The protective cover is detachably installed on the U-shaped mounting base through the snap-fit ​​protrusions and the snap-fit ​​slots. A wiring clearance groove is provided on one side of the protective cover. The top of the protective cover is provided with a clearance part for realizing the swing clearance of the pointer part.

9. A flue gas backflow prevention device, characterized in that, The flue gas check valve according to claim 1 further includes a mounting base and a flue gas connecting cylinder, wherein the mounting base and the flue gas connecting cylinder are respectively installed at the flue gas inlet end and the flue gas outlet end of the cylindrical valve body.

10. The flue gas backflow prevention device according to claim 9, characterized in that, The mounting base has a connecting cylinder, the inner diameter of which is adapted to the outer diameter of the cylindrical valve body, and the bottom of the mounting base is provided with a plurality of valve body support plates, which are evenly arranged along the circumference of the connecting cylinder, and one end of the valve body support plate extends to the inner side of the connecting cylinder. The cylindrical valve body is mounted on the mounting base through the connecting cylinder and the valve body support plates, and the cylindrical valve body is set against the valve body support plates. And / or, the flue connecting cylinder has a first annular snap-fit ​​groove adapted to the cylindrical valve body at one end near the cylindrical valve body, and the flue connecting cylinder is installed on the cylindrical valve body through the first annular snap-fit ​​groove. The other end of the flue connecting cylinder has a second annular snap-fit ​​groove adapted to the flue pipe opening. The inner wall of the flue connecting cylinder has an integrally formed flue baffle and a support limiting piece. There are a plurality of support limiting pieces, and the plurality of support limiting pieces are evenly arranged along the circumference of the flue connecting cylinder.

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