A smoke exhaust hood check valve

Abstract

A kind of oil fume exhaust fan flue check valve, it includes seat body installed on flue, the middle part of seat body is hollow to form air duct with flue conduction, the front face of seat body extends outwardly with the pipe of butt joint;It also includes valve body, the valve body includes mounting ring, the rear end of mounting ring extends backward with the rear connecting pipe of butt joint, the front end of mounting ring extends forward with the front connecting pipe and the exhaust pipe of oil fume exhaust fan is connected;The rear connecting pipe is sleeved on the inner hole of butt joint pipe, and a plurality of positioning clamping platforms are arranged on the cylindrical surface of rear connecting pipe, and a plurality of positioning clamping grooves corresponding to positioning clamping platform are arranged on the inner wall of butt joint pipe.The beneficial effects of the utility model are that: the utility model is set up the sleeving structure of rear connecting pipe and butt joint pipe, and the positioning clamping platform on the cylindrical surface of rear connecting pipe and the positioning clamping groove on the inner wall of butt joint pipe are designed, the quick rotary butt joint of valve body and seat body is realized.

Description

Technical Field

[0001] This utility model relates to the field of kitchen and bathroom technology, specifically a range hood flue check valve. Background Technology

[0002] A range hood duct check valve is a device commonly used in household kitchen exhaust systems. Its main function is to prevent backflow or odors from entering the room, ensuring a hygienic and safe kitchen environment. While there are many types of range hood duct check valves available, they generally have some drawbacks that can affect their effectiveness and user experience. These problems mainly manifest in the following aspects:

[0003] 1. Complex valve body and seat connection: In existing check valve designs, the valve body and seat are typically connected by a rotary connection. However, in actual operation, the rotation angle between the valve body and seat is relatively large, requiring the user to apply a significant torque to complete the connection. This design not only makes the installation process complex and labor-intensive but also easily leads to incomplete connection due to insufficient torque during the connection process, affecting the sealing performance and working effect of the check valve.

[0004] 2. Poor reliability of snap-fit ​​fixing: Some existing check valves use a simple snap-fit ​​fixing method after docking. Due to insufficient precision or small force-bearing area in the snap-fit ​​design, loosening may occur after a period of use. Loosening will cause the valve body to shift, damaging its seal with the seat, and in severe cases, it may even affect the check function, allowing backflow of flue gas or odors to enter the room.

[0005] 3. Prone to Installation Errors: Existing check valve designs often lack clear directional markings, making it easy for users to install them incorrectly. If the valve body is installed in the wrong direction, the valve plate may not open or close properly, resulting in check valve failure or a significant increase in airflow resistance. This situation is particularly likely to occur when operated by non-professional installers, further increasing inconvenience during use.

[0006] 4. Insufficient user experience and ease of maintenance: Most current check valves lack modular design, making disassembly and cleaning complex and inconvenient, which fails to meet users' daily maintenance needs. Furthermore, the valve body has low transparency, making it difficult for users to visually determine whether the valve body is clean or whether components are functioning properly. Therefore, further improvements are necessary. Utility Model Content

[0007] The purpose of this utility model is to overcome the shortcomings of existing technologies and provide a range hood flue check valve that is simple in structure, easy to use, and improves the reliability of buckle fixing by optimizing the docking method between the valve body and the seat.

[0008] The purpose of this utility model is achieved in the following way: a range hood flue check valve, which includes a seat installed on the flue, the middle of the seat is hollowed out to form an air duct that is connected to the flue, and a connecting pipe extends outward from the front of the seat.

[0009] It also includes a valve body, which includes a mounting ring. The rear end of the mounting ring extends rearward to connect with a connecting pipe, and the front end of the mounting ring extends forward to connect with a front connecting pipe that connects to the exhaust pipe of the range hood.

[0010] The rear connecting pipe is fitted onto the inner hole of the connecting pipe. Several positioning plates are provided on the cylindrical surface of the rear connecting pipe. Correspondingly, several positioning slots that cooperate with the positioning plates are provided on the inner wall of the connecting pipe. The open end of the positioning slot is connected to the inlet slot. After the positioning plate extends into the inlet slot, the positioning plate is rotated to make it circumferentially engage with the positioning slot and fix it.

[0011] The inner hole of the mounting ring is provided with a first hinge seat and a second hinge seat, which are connected by a crossbeam. A first valve plate and a second valve plate are mounted opposite to each other on the first hinge seat and the second hinge seat. The first valve plate and the second valve plate always swing in the closing direction under the drive of the reset mechanism.

[0012] Furthermore: the inlet of the front connecting pipe is inclined towards the mounting ring and a guide ring is provided, and the first hinge seat and the second hinge seat are located at the innermost end of the guide ring.

[0013] Furthermore: the first hinge seat and the second hinge seat are asymmetrically arranged, with the first hinge seat located at the upper end being close to the air inlet of the rear connecting pipe, and the second hinge seat located at the lower end being far away from the air inlet of the connecting pipe. The first valve plate and the second valve plate are inclinedly arranged within the mounting ring.

[0014] Furthermore: the first hinge seat and the second hinge seat are provided with hinge holes, and an opening slot is opened through the hinge holes; the first valve plate and the second valve plate are provided with hinge shafts, and the hinge shafts on the first valve plate and the second valve plate are inserted into the hinge holes through the guide slot.

[0015] Furthermore, a pressure plate is installed on the surface of the inlet groove.

[0016] Furthermore, the mounting ring, rear connecting tube, and front connecting tube are integrally injection molded from transparent plastic material.

[0017] Furthermore, the mounting ring is provided with a direction indicator for upward installation and a rotation indicator for the direction of rotation during docking.

[0018] Furthermore, at least three sets of positioning slots and positioning platforms are provided, arranged in a circular array.

[0019] Furthermore, at least two positioning slots and positioning platforms are provided axially, and the two positioning slots and positioning platforms extend in a multi-line spiral direction.

[0020] Furthermore, the mounting ring is provided with an external auxiliary positioning hole, and the connecting pipe is provided with an internal auxiliary positioning hole. The positioning screw passes through the external auxiliary positioning hole and is screwed into the internal auxiliary positioning hole for fixation.

[0021] The beneficial effects of this utility model are: 1. Simple structure, low production cost, and improved market competitiveness.

[0022] 2. This utility model achieves rapid rotational docking between the valve body and the seat by setting up a packaged structure of the rear connecting pipe and the connecting pipe, and designing a positioning platform on the cylindrical surface of the rear connecting pipe and a positioning groove on the inner wall of the connecting pipe. The positioning platform and positioning groove extend using a multi-threaded design, significantly reducing the rotation angle required for docking in traditional structures, lowering the user's installation difficulty and torque requirements, and improving operational convenience.

[0023] 3. This utility model features an upward-facing installation direction indicator and a rotation direction indicator on the mounting ring, significantly reducing the risk of valve plate failure due to incorrect installation direction. The intuitive and clear markings allow even non-professionals to install correctly, effectively improving the user experience and assembly accuracy.

[0024] 4. This utility model, through the asymmetrical arrangement of the first and second hinge seats, makes the first and second valve plates tilted within the mounting ring, enabling more effective use of airflow force to achieve opening and closing actions. The reset mechanism ensures that the valve plates always swing in the closing direction, providing a stable anti-reverse effect, making it particularly suitable for backflow protection in complex smoke exhaust environments.

[0025] 5. This utility model has a guide ring at the inlet of the front connecting pipe. The guide ring is arranged at an angle so that there are no steps inside the pipe. This not only optimizes the path of airflow into the valve body and reduces eddy currents, but also further reduces the smoke exhaust resistance, thereby improving the smoke exhaust efficiency and the working performance of the check valve.

[0026] 6. This utility model uses a transparent plastic material to integrally injection mold the mounting ring, rear connecting pipe and front connecting pipe, so that users can clearly observe the working status and cleanliness of the valve body, which is convenient for daily maintenance.

[0027] 7. This utility model provides an additional fixing method by using external auxiliary positioning holes and internal auxiliary positioning holes in conjunction with positioning screws, which effectively enhances the stability of the entire check valve structure, adapts to vibration and external impact during long-term use, and extends the service life of the product. Attached Figure Description

[0028] Figure 1 , 2 This is a diagram showing the final assembly and usage effect of this utility model.

[0029] Figure 3 This is a cross-sectional view of the structure of this utility model.

[0030] Figure 4 This is an exploded view of the structure of this utility model.

[0031] Figure 5 In this utility model Figure 4 Enlarged view of the structure of part A.

[0032] Figure 6 In this utility model Figure 4 Enlarged view of the structure of part B.

[0033] Figure 7 This is a schematic diagram of the valve plate of the valve body in the closed state in this utility model.

[0034] Figure 8 This is a schematic diagram of the valve plate of the valve body in the open state in this utility model.

[0035] Figure 9 This is an exploded view of the valve body structure in this utility model.

[0036] Figure 10 In this utility model Figure 9 Enlarged view of the C-section structure. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings. A range hood flue check valve includes a seat 1 installed on the flue, the middle of the seat 1 is hollowed out to form an air duct 11 that is connected to the flue, and a connecting pipe 12 extends outward from the front of the seat 1;

[0038] It also includes a valve body 2, which includes a mounting ring 21. The rear end of the mounting ring 21 extends rearward to connect with a rear connecting pipe 22 and docking with the connecting pipe 12. The front end of the mounting ring 21 extends forward to connect with a front connecting pipe 23 and connecting with the exhaust pipe of the range hood.

[0039] The rear connecting pipe 22 is fitted onto the inner hole of the connecting pipe 12. Several positioning platforms 3 are provided on the cylindrical surface of the rear connecting pipe 22. Correspondingly, several positioning grooves 4 that cooperate with the positioning platforms 3 are provided on the inner wall of the connecting pipe 12. The open end of the positioning groove 4 is connected to the guide groove 41. After the positioning platform 3 extends into the guide groove 41, the positioning platform 3 is rotated to make it circumferentially inserted into the positioning groove 4 for fixation.

[0040] The inner hole of the mounting ring 21 is provided with a first hinge seat 24 and a second hinge seat 25, which are connected by a crossbeam 26. A first valve plate 27 and a second valve plate 28 are mounted opposite to each other on the first hinge seat 24 and the second hinge seat 25. The first valve plate 27 and the second valve plate 28 always swing in the closing direction under the drive of the reset mechanism.

[0041] In one embodiment: the port of the front connecting pipe 23 is provided with a guide ring 29 inclined towards the mounting ring 21, and the first hinge seat 24 and the second hinge seat 25 are located at the innermost end of the guide ring 29.

[0042] In one embodiment: the first hinge seat 24 and the second hinge seat 25 are asymmetrically arranged, with the first hinge seat 24 located at the upper end being close to the air inlet of the rear connecting pipe 22, and the second hinge seat 25 located at the lower end being far away from the air inlet of the connecting pipe, and the first valve plate 27 and the second valve plate 28 being inclinedly arranged within the mounting ring 21.

[0043] In one embodiment: the first hinge seat 24 and the second hinge seat 25 are provided with hinge holes 5, and an opening slot 51 is opened through the hinge holes 5; the first valve plate 27 and the second valve plate 28 are provided with hinge shafts 52, and the hinge shafts 52 on the first valve plate 27 and the second valve plate 28 are inserted into the hinge holes 5 through the guide slot 41.

[0044] In one embodiment: a pressure plate 53 is installed on the surface of the inlet groove 41, and the pressure plate fixes the hinge shaft in the inlet groove.

[0045] In one embodiment: the mounting ring 21, the rear connecting tube 22, and the front connecting tube 23 are integrally injection molded from transparent plastic material.

[0046] In one embodiment: the mounting ring 21 is provided with a direction indicator 6 indicating upward installation and a rotation indicator 61 indicating the direction of docking rotation.

[0047] In one embodiment, at least three sets of positioning slots 4 and positioning platforms 3 are provided, arranged in a circular array.

[0048] In one embodiment: at least two positioning slots 4 and positioning platforms 3 are provided axially, and the two positioning slots 4 and positioning platforms 3 extend in a multi-line spiral direction.

[0049] In one embodiment: the mounting ring 21 is further provided with an outer auxiliary positioning hole 7, and the connecting pipe 12 is provided with an inner auxiliary positioning hole 71. The positioning screw 73 passes through the outer auxiliary positioning hole 7 and is screwed to the inner auxiliary positioning hole 71 for fixation.

[0050] Working principle: In this case, the valve body 2 and the seat 1 are connected by a sleeve structure of the rear connecting pipe 22 and the connecting pipe 12. Several positioning plates 3 are provided on the cylindrical surface of the rear connecting pipe 22, and correspondingly, positioning grooves 4 are provided on the inner wall of the connecting pipe 12. During installation, the positioning plates 3 of the rear connecting pipe 22 slide in along the guide groove 41, and after rotating a small angle, the positioning plates 3 embed into the positioning grooves 4, thereby achieving a secure lock.

[0051] The design includes at least two axially distributed positioning slots 4 and positioning platforms 3, extending in a multi-threaded spiral direction. This design simplifies the installation process. Compared to traditional structures requiring larger rotation angles, this invention uses a multi-threaded approach for the positioning slots and platforms, allowing for docking with only a small rotation angle, significantly improving installation convenience and efficiency. Furthermore, at least three sets of positioning slots 4 and positioning platforms 3 are arranged in a circular array. Each set has a different width, ensuring proper alignment before installation, thus guaranteeing the valve plate's correct installation position and preventing mistaken installation.

[0052] Furthermore, a first hinge seat 24 and a second hinge seat 25 are provided inside the mounting ring 21, and the two hinge seats are connected by a crossbeam 26. A first valve plate 27 and a second valve plate 28 are respectively hinged to the hinge seats. The valve plates are always kept swinging in the closed direction under the action of the reset mechanism, which usually uses a torsion spring. When the range hood exhausts, the airflow pressure pushes the valve plate to swing in the open direction against the reset force, so that the exhaust is smooth; when the exhaust stops or backflow occurs in the flue, the reset mechanism immediately drives the valve plate to close, preventing backflow into the room.

[0053] The asymmetrical hinged seat and the angled valve plate design optimize the valve plate's movement path, allowing it to contact the air intake at an angle. This enables the valve plate to open even under low airflow pressure, reducing exhaust resistance and ensuring a tight seal during backflow.

[0054] Furthermore, a guide ring 29 is installed at the inlet of the front connecting pipe 23. This guide ring ensures a smooth flow within the pipe and guides the airflow. The inclined design of the guide ring optimizes the direction of airflow entering the valve body, reducing airflow turbulence and eddies, thereby further improving exhaust efficiency and backflow prevention. This design is particularly suitable for kitchen environments with large exhaust volumes, effectively avoiding the problems of frequent valve opening and closing or poor backflow prevention caused by airflow turbulence in traditional structures.

[0055] It should be noted that this utility model has an upward installation direction indicator 6 and a rotation direction indicator 61 on the mounting ring 21. These markings can intuitively guide the user to complete the installation correctly, avoiding valve plate malfunction due to incorrect installation direction. At the same time, the outer auxiliary positioning hole 7 and the inner auxiliary positioning hole 71 are fixed by positioning screws 73, further enhancing the installation accuracy and structural stability.

[0056] Furthermore, the mounting ring 21, rear connecting pipe 22, and front connecting pipe 23 are integrally injection molded from transparent plastic material. This design allows users to intuitively observe the working status and cleanliness of the valve body's interior, improving maintenance convenience while also enhancing the product's aesthetics and user experience.

[0057] In summary, this utility model, through optimized structural design and material selection, not only significantly improves the ease of installation and check valve performance, but also enhances the user experience, demonstrating significant technological advantages.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A check valve for the flue gas duct of a range hood, characterized in that: It includes a seat (1) installed on the flue, with a hollowed-out middle part of the seat (1) forming an air duct (11) that communicates with the flue, and a connecting pipe (12) extending outward from the front of the seat (1). It also includes a valve body (2), which includes a mounting ring (21). The rear end of the mounting ring (21) extends backward to connect to the connecting pipe (12), and the front end of the mounting ring (21) extends forward to connect to the exhaust pipe of the range hood. The rear connecting pipe (22) is fitted onto the inner hole of the connecting pipe (12). Several positioning plates (3) are provided on the cylindrical surface of the rear connecting pipe (22). Correspondingly, several positioning slots (4) that cooperate with the positioning plates (3) are provided on the inner wall of the connecting pipe (12). The open end of the positioning slot (4) is connected to the guide slot (41). After the positioning plate (3) extends into the guide slot (41), the positioning plate (3) is rotated to make it circumferentially inserted into the positioning slot (4) and fixed. The inner hole of the mounting ring (21) is provided with a first hinge seat (24) and a second hinge seat (25), which are connected by a crossbeam (26). A first valve plate (27) and a second valve plate (28) are mounted opposite to each other on the first hinge seat (24) and the second hinge seat (25). The first valve plate (27) and the second valve plate (28) always swing in the closing direction under the drive of the reset mechanism. The surface of the inlet groove (41) is covered with a pressure plate (53).

2. The range hood flue check valve according to claim 1, characterized in that: The front connecting pipe (23) has a guide ring (29) inclined towards the mounting ring (21) at its opening, and the first hinge seat (24) and the second hinge seat (25) are located at the innermost end of the guide ring (29).

3. The range hood flue check valve according to claim 1, characterized in that: The first hinge seat (24) and the second hinge seat (25) are asymmetrically arranged. The first hinge seat (24) located at the upper end is located near the air inlet of the rear connecting pipe (22), and the second hinge seat (25) located at the lower end is located away from the air inlet of the connecting pipe. The first valve plate (27) and the second valve plate (28) are inclinedly arranged inside the mounting ring (21).

4. The range hood flue check valve according to claim 1, characterized in that: The first hinge seat (24) and the second hinge seat (25) are provided with hinge holes (5), and an opening groove (51) is provided through the hinge holes (5); the first valve plate (27) and the second valve plate (28) are provided with hinge shafts (52), and the hinge shafts (52) on the first valve plate (27) and the second valve plate (28) are inserted into the hinge holes (5) through the guide groove (41).

5. A range hood flue check valve according to claim 1, characterized in that: The mounting ring (21), rear connecting pipe (22), and front connecting pipe (23) are integrally injection molded from transparent plastic material.

6. A range hood flue check valve according to claim 1, characterized in that: The mounting ring (21) is provided with a direction indicator (6) indicating upward installation and a rotation indicator (61) indicating the direction of docking rotation.

7. A range hood flue check valve according to claim 1, characterized in that: The positioning slot (4) and positioning platform (3) are provided in at least three sets, arranged in a circular array.

8. A range hood flue check valve according to claim 1 or 7, characterized in that: The positioning slots (4) and positioning platforms (3) are arranged axially, with at least two of them. The two positioning slots (4) and positioning platforms (3) extend in a multi-line spiral direction.

9. A range hood flue check valve according to claim 1, characterized in that: The mounting ring (21) is also provided with an external auxiliary positioning hole (7), and the connecting pipe (12) is provided with an internal auxiliary positioning hole (71). The positioning screw (73) passes through the external auxiliary positioning hole (7) and is screwed to the internal auxiliary positioning hole (71) for fixation.

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