Smoke exhaust pipeline of range hood

Abstract

The utility model relates to the field of range hood pipelines. The U-shaped grooves annularly arrayed in the surface of the inner pipe are matched with the annular grooves and the flow guide grooves in the top face of the fixing ring to form a three-stage oil dirt collecting channel, oil drops fall down along the U-shaped grooves, then are collected to the flow guide grooves through the annular grooves and finally flow into the T-shaped box, oil dirt is effectively prevented from leaking at the pipeline connecting position, and the oil dirt collecting effect is improved. The smoke exhaust pipeline of the range hood solves the problem of cabinet pollution caused by oil dirt accumulation of a traditional pipeline, a box body assembly is connected through magnetic attraction of a magnetic attraction block A and a magnetic attraction block B, rapid disassembly of a T-shaped box is achieved, when oil dirt is accumulated, the T-shaped box can be taken out only by separating the magnetic attraction blocks, resetting is conducted after waste oil is poured, and the maintenance efficiency is improved. One end of the L-shaped pipe is sleeved with an inner pipe, a plurality of U-shaped grooves are formed in the surface of the inner pipe in an annular array mode, a fixing ring is arranged at the bottom of the inner pipe, and an annular groove is formed in the top face of the fixing ring and surrounds the outer circle of the bottom of the inner pipe by a circle.

Description

Technical Field

[0001] This utility model relates to the field of range hood duct technology, and in particular to a range hood exhaust duct. Background Technology

[0002] A range hood is a device in the kitchen used to remove cooking fumes and odors. Its main function is to exhaust these fumes and odors outdoors through a duct, keeping the kitchen air fresh. The range hood duct is the channel connecting the range hood to the outdoor exhaust vent, responsible for effectively removing cooking fumes and odors.

[0003] In the prior art, such as in CN213901189U, a range hood exhaust pipe is disclosed. It includes an exhaust pipe with a smoke outlet connected to the bottom end and a smoke outlet at the top of the range hood. A locking device is installed on the outer wall of the exhaust pipe, and a fixing seat is installed on the outer wall of the exhaust pipe above the locking device. A suction cup is provided on the end face of the fixing seat. The top of the locking device is provided with a locking port, and the bottom of the locking device is provided with a thread. A bolt is installed inside the suction cup, and an air extraction plate is fixed on the outer wall of the bolt.

[0004] Although the aforementioned patent effectively solves the problem of easy detachment between the fume duct and the range hood by setting a locking port, a locking device, threads, and internal threads, and by rotating the locking device to compress the locking port, thus fixing the pipe connection, as the range hood is used for a longer period of time, oil leakage will occur at the connection between the pipe and the range hood, making cleaning difficult. At the same time, the negative pressure device of the range hood is located at the suction end, while the end of the pipe is affected by external factors and the slow smoke flow rate, resulting in smoke backflow. Therefore, a new fume hood exhaust pipe is proposed to address the above problems. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing the following technical solution:

[0006] A range hood exhaust duct includes an L-shaped pipe; one end of the L-shaped pipe is fitted with an inner pipe, the surface of the inner pipe has a plurality of U-shaped grooves arranged in a ring array, the bottom of the inner pipe is provided with a fixing ring, the top surface of the fixing ring and around the outer circumference of the bottom of the inner pipe are provided with an annular groove, the surface of the fixing ring is provided with a guide groove, one end of the guide groove is connected to the annular groove, one end of the guide groove is connected to a positioning block, and the surface of the positioning block is provided with a box assembly for oil storage;

[0007] The box assembly includes A magnetic blocks disposed on both sides of the surface of the positioning block, B magnetic blocks magnetically connected to the surface of the A magnetic blocks, and a T-shaped box for storing waste oil fixedly connected to the surface of the B magnetic blocks, and a cover plate for pouring out waste oil is provided on the top of the T-shaped box.

[0008] The other end of the L-shaped tube is connected to a connecting tube, and an A-shaped tapered tube is sleeved inside the connecting tube.

[0009] As an improvement to the above technical solution, the top of the inner tube is connected to a B-shaped tube, which has a structure that is narrow at the top and wide at the bottom, and the diameter of the bottom of the B-shaped tube is the same as the inner diameter of the inner tube.

[0010] As an improvement to the above technical solution, the A-shaped conical tube has a structure that is wider on the left and narrower on the right, with its narrow end facing the exhaust port of the connecting pipe and its wide end facing the L-shaped tube.

[0011] As an improvement to the above technical solution, one end of the connecting pipe is connected to a horizontal pipe, the horizontal pipe is connected to the connecting pipe and is vertically distributed, and both ends of the horizontal pipe are connected.

[0012] As an improvement to the above technical solution, a mounting plate is fixedly connected to the bottom of the fixing ring, and a plug pipe for communicating with the range hood is provided at the bottom of the mounting plate.

[0013] As an improvement to the above technical solution, mounting holes are provided at the four corners of the top surface of the mounting plate, and threaded bolts for fixing to the range hood are provided inside the mounting holes.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model uses a U-shaped groove array on the inner pipe surface, combined with an annular groove and a guide groove on the top surface of the fixed ring, to form a three-stage oil collection channel. After oil droplets fall along the U-shaped groove, they are collected in the guide groove through the annular groove and finally flow into the T-shaped box, effectively preventing oil leakage at the pipe connection and solving the problem of cabinet pollution caused by oil accumulation in traditional pipes. The box assembly is connected by magnetic blocks A and B, enabling quick disassembly of the T-shaped box. When oil accumulates, the T-shaped box can be removed simply by separating the magnetic blocks, emptying the waste oil, and then resetting the box, thus improving maintenance efficiency.

[0016] 2. The A-shaped tube inside the connecting pipe of this utility model adopts a structure that is wider on the left and narrower on the right, with the narrow end facing the smoke exhaust port, forming a gradually narrowing airflow channel. This design accelerates the exhaust airflow at the outlet, increases the exhaust flow rate, and effectively suppresses the backflow of smoke caused by external airflow interference. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the inner tube structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the box assembly structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the connecting pipe structure of this utility model.

[0021] In the diagram: 1. L-shaped tube; 2. Inner tube; 3. U-shaped groove; 4. Fixing ring; 5. Annular groove; 6. Guide groove; 7. Positioning block; 8. Box assembly; 81. A magnetic block; 82. B magnetic block; 83. T-shaped box; 84. Cover plate; 9. Connecting tube; 91. A tapered tube; 10. B tapered tube; 11. Horizontal tube; 12. Mounting plate; 13. Threaded bolt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following provides a more detailed description of the utility model. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the utility model.

[0023] Please see Figures 1-4 As shown, a range hood exhaust pipe includes an L-shaped pipe 1; one end of the L-shaped pipe 1 is fitted with an inner pipe 2, the surface of the inner pipe 2 is provided with a plurality of U-shaped grooves 3 in a ring array, the bottom of the inner pipe 2 is provided with a fixing ring 4, the top surface of the fixing ring 4 and around the bottom outer ring of the inner pipe 2 are provided with an annular groove 5, the surface of the fixing ring 4 is provided with a guide groove 6, and one end of the guide groove 6 is connected to the annular groove 5, one end of the guide groove 6 is connected to a positioning block 7, the surface of the positioning block 7 is provided with a box assembly 8 for storing oil; the box assembly 8 includes A magnetic blocks 81 provided on both sides of the surface of the positioning block 7, the surface of the A magnetic blocks 81 is magnetically connected to B magnetic blocks 82, the surface of the B magnetic blocks 82 is fixedly connected to a T-shaped box 83 for storing waste oil, and the top of the T-shaped box 83 is provided with a cover plate 84 for pouring out waste oil.

[0024] During operation, the U-shaped groove 3 expands the contact area of ​​oil droplets, the annular groove 5 collects them, and the guide groove 6 directs the flow to the oil storage box, achieving a fully enclosed flow of oil. The oil droplets flow downwards along the U-shaped groove 3 on the surface of the inner tube 2 and converge into the annular groove 5 at the top of the fixed ring 4. The oil in the annular groove 5 flows directionally to the positioning block 7 through the guide groove 6, and the oil enters the T-shaped box 83 through the opening at the end of the guide groove 6.

[0025] Furthermore, the other end of the L-shaped pipe 1 is connected to a connecting pipe 9, and an A-shaped tapered pipe 91 is sleeved inside the connecting pipe 9. One end of the connecting pipe 9 is connected to a horizontal pipe 11, which is connected to the connecting pipe 9 and is vertically distributed. Both ends of the horizontal pipe 11 are connected. The A-shaped tapered pipe 91 has a structure that is wider on the left and narrower on the right. Its narrow end faces the exhaust port of the connecting pipe 9, while its wide end faces the L-shaped pipe 1.

[0026] During operation, the oil fume airflow enters the connecting pipe 9 from the L-shaped pipe 1 and flows through the internal A-shaped conical pipe 91. The tapered structure accelerates the airflow, increases the exhaust speed, and prevents backflow of external airflow. The A-shaped conical pipe 91, which is wider on the left and narrower on the right, forms a tapered channel to accelerate the airflow speed. The horizontal pipe 11 vertically divides the airflow to balance the internal and external air pressure and suppress reverse airflow. The vertical division design of the horizontal pipe 11 balances the internal and external pressure of the pipe, reduces turbulence resistance, and ensures stable exhaust.

[0027] Furthermore, the top of the inner tube 2 is connected to a B-shaped tube 10, which has a structure that is narrow at the top and wide at the bottom, and the diameter of the bottom of the B-shaped tube 10 is the same as the inner diameter of the inner tube 2.

[0028] During operation, the B-shaped conical tube 10 at the top of the inner tube 2 guides the airflow to smoothly transition to the L-shaped tube 1, avoiding airflow turbulence and noise at sharp bends. At the same time, the B-shaped conical tube 10 has a narrow top and wide bottom structure, and its narrow top part forms a gap with the inner wall of the L-shaped tube 1, allowing oil stains to enter the U-shaped groove 3 along this gap, preventing oil stains inside the L-shaped tube 1 from flowing back into the range hood.

[0029] Furthermore, the bottom of the fixing ring 4 is fixedly connected to the mounting plate 12. The bottom of the mounting plate 12 is provided with a plug pipe for communicating with the range hood. Mounting holes are provided at the four corners of the top surface of the mounting plate 12, and threaded bolts 13 for fixing to the range hood are provided inside the mounting holes.

[0030] During operation, ensure a secure connection to the range hood's air outlet to prevent the duct from shaking or falling off, ensure airtightness, and distribute the force evenly among the four corner bolts to avoid cracking at the connection due to stress concentration at a single point.

[0031] Working principle: During cooking, oil droplets are carried by airflow into L-shaped tube 1 and adhere to the surface of inner tube 2. The oil droplets flow downward along U-shaped groove 3 on the surface of inner tube 2 and flow into annular groove 5 at the top of fixed ring 4. The oil in annular groove 5 flows directionally to positioning block 7 through guide groove 6. The oil enters T-shaped box 83 through the end opening of guide groove 6. When the oil in T-shaped box 83 is more than half full, it is separated by magnetic block A 81 and magnetic block B 82. The box is removed, the cover 84 is opened to pour out the waste oil, and the magnetic attraction is reset to complete the cleaning.

[0032] The oil fume airflow enters the connecting pipe 9 from the L-shaped pipe 1, flows through the internal A-shaped tapered pipe 91, and the tapered tapered structure accelerates the airflow, increases the exhaust speed, and prevents the external airflow from flowing back. The accelerated airflow enters the horizontal pipe 11 through the connecting pipe 9.

[0033] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A range hood exhaust duct, characterized in that, include: Includes an L-shaped tube (1); one end of the L-shaped tube (1) is fitted with an inner tube (2), the surface of the inner tube (2) is provided with a number of U-shaped grooves (3) in a ring array, a fixing ring (4) is provided at the bottom of the inner tube (2), an annular groove (5) is provided on the top surface of the fixing ring (4) and around the bottom of the inner tube (2), a flow guide groove (6) is provided on the surface of the fixing ring (4), and one end of the flow guide groove (6) is connected to the annular groove (5), a positioning block (7) is connected through the one end of the flow guide groove (6), and a box assembly (8) for oil storage is provided on the surface of the positioning block (7); The box assembly (8) includes A magnetic blocks (81) disposed on both sides of the surface of the positioning block (7), B magnetic blocks (82) are magnetically connected to the surface of the A magnetic blocks (81), and a T-shaped box (83) for storing waste oil is fixedly connected to the surface of the B magnetic blocks (82), and a cover plate (84) for pouring waste oil is opened on the top of the T-shaped box (83). The other end of the L-shaped tube (1) is connected to a connecting tube (9), and an A-shaped tapered tube (91) is sleeved inside the connecting tube (9).

2. The range hood exhaust duct according to claim 1, characterized in that: The top of the inner tube (2) is connected to a B-shaped conical tube (10), which has a narrow top and wide bottom structure, and the diameter of the bottom of the B-shaped conical tube (10) is the same as the inner diameter of the inner tube (2).

3. The range hood exhaust duct according to claim 1, characterized in that: The A-shaped tapered tube (91) has a structure that is wider on the left and narrower on the right. Its narrow end faces the exhaust port of the connecting tube (9), while its wide end faces the L-shaped tube (1).

4. The exhaust duct of a range hood according to claim 1, characterized in that: One end of the connecting pipe (9) is connected to a horizontal pipe (11), which is connected to the connecting pipe (9) and is vertically distributed. Both ends of the horizontal pipe (11) are connected.

5. The exhaust duct of a range hood according to claim 1, characterized in that: The bottom of the fixing ring (4) is fixedly connected to the mounting plate (12), and the bottom of the mounting plate (12) is provided with a plug pipe for communicating with the range hood.

6. The exhaust duct of a range hood according to claim 5, characterized in that: Mounting holes are provided at the four corners of the top surface of the mounting plate (12), and threaded bolts (13) for fixing to the range hood are provided inside the mounting holes.

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