A gas pressure balancing device for a range hood duct

Abstract

The utility model discloses a range hood air duct air pressure balancing device relates to range hood supporting equipment technical field, including the smoke pipe, and the spiral pipe is wound to the smoke pipe outer ring wall, and the spiral pipe outer periphery is equipped with the heat preservation tube, the smoke pipe one end connects the smoke outlet of range hood, and the other end is connected public flue through the check valve, and the spiral pipe one end connects the air intake component, and the air intake component extends to the outside air introduction, and the other end is connected the air supply component, and the air supply component connects the air supply port of range hood lower end surface, the air supply port opening faces range hood lower cooking area, and is the two mouth symmetrical layout, and is 30 with horizontal direction 45 inclination, and the spiral pipe is equipped with annular heat transfer rib, and the smoke pipe outer ring wall is coated with the graphene coating, and the air supply component pipeline outer periphery is covered with the heat preservation layer. The device can utilize the flue gas waste heat preheating air supply, and the kitchen negative pressure is balanced, and the oil fume is guided to gather the smoke chamber simultaneously, and the exhaust efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of range hood accessories, and in particular to a range hood duct air pressure balancing device. Background Technology When a range hood is working, its built-in fan continuously extracts cooking fumes, creating a negative pressure environment inside the kitchen. This negative pressure can cause several practical problems: the gas stove flame may shift due to the pressure difference, leading to decreased combustion stability; the water seal in the drain trap may be disrupted by the negative pressure, causing sewer odors to back up into the kitchen; and the high-speed airflow entering through gaps in doors, windows, and walls can produce noticeable whistling noises, affecting the daily living experience.

[0002] To alleviate the aforementioned negative pressure problem, existing technologies mainly employ two types of air supply methods: one is to achieve natural air supply by opening doors and windows, using the pressure difference between indoors and outdoors to introduce outdoor air; the other is to force outdoor air into the kitchen through an independently installed fan and associated ductwork.

[0003] However, the two methods of air supply mentioned above share a common drawback: in cold seasons such as winter, the cold outdoor air supplied to the kitchen diffuses directly, causing the temperature inside the kitchen to drop rapidly, reducing the comfort of cooking. This is a problem that existing air supply technologies need to address. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a range hood duct air pressure balancing device to solve the problem that existing air supply methods cannot simultaneously balance negative pressure in the kitchen and supply air temperature.

[0005] The technical solution of this utility model is as follows: A range hood duct pressure balancing device includes an exhaust pipe, which is a flexible tube made of aluminum foil composite fiberglass. One end of the exhaust pipe is connected to the exhaust port of the range hood, and the other end is connected to a common flue via a check valve. A spiral tube is wound around the outer ring wall of the exhaust pipe, and the winding trajectory of the spiral tube is parallel to the axis of the exhaust pipe. An insulation tube made of flame-retardant rubber and plastic sponge is fitted around the outer circumference of the spiral tube. An air outlet with a rectangular structure is provided on the lower end face of the range hood, and the opening of the air outlet faces the cooking area below the range hood. The end of the spiral tube near the check valve passes through the insulation tube and is connected to an air inlet assembly. The end of the air inlet assembly away from the spiral tube passes through the wall and extends to the outside to introduce fresh outdoor air. The end of the spiral tube near the range hood passes through the insulation tube and is connected to an air supply assembly. The end of the air supply assembly away from the spiral tube is connected to the air outlet to deliver the preheated air in the spiral tube to the kitchen.

[0006] Furthermore, multiple annular heat transfer ribs are provided at intervals along the axis of the outer ring wall of the spiral tube. The annular heat transfer ribs are integrally formed with the spiral tube and the spacing between adjacent annular heat transfer ribs is equal. The multiple annular heat transfer ribs are all located on the outer ring wall of the spiral tube inside the insulation tube. By setting the annular heat transfer ribs, the contact area between the spiral tube and the air inside the insulation tube can be increased, thereby improving the efficiency of transferring waste heat from the flue pipe to the spiral tube.

[0007] Furthermore, the check valve includes a mounting base, on which a first connecting ring is vertically mounted. The outer wall of the first connecting ring is tightly fitted to the inner wall of the exhaust pipe. A second connecting ring is provided on the mounting base around the outer periphery of the first connecting ring. The outer wall of the second connecting ring is tightly fitted to the inner wall of one end of the insulation pipe. The other end of the insulation pipe is sealed to the exhaust port of the range hood. The length of the insulation pipe covers the entire winding area of ​​the spiral pipe.

[0008] Furthermore, there are two air outlets, which are symmetrically distributed along the width of the range hood. The angle between the tilt direction of the air outlet and the horizontal direction is 30° to 45°, and the tilt direction is consistent with the opening direction of the air outlet. This tilt angle and position design makes the preheated air discharged from the air outlet form an "airflow barrier". On the one hand, it fills the negative pressure in the kitchen, and on the other hand, it guides the cooking fumes to converge into the smoke collection chamber of the range hood, reducing the spread and escape of fumes and helping to improve the exhaust efficiency of the range hood.

[0009] Furthermore, the air supply assembly includes a main air supply pipe, a first branch pipe connected to the end of the main air supply pipe away from the spiral tube, and second branch pipes connected to both ends of the first branch pipe, with the ends of the two second branch pipes away from the first branch pipe respectively connected to the air outlet.

[0010] Furthermore, a transition section is provided at the connection between the first branch pipe and the main air supply pipe. The diameter of the transition section gradually decreases from the end of the main air supply pipe to the end of the first branch pipe. The transition section allows the airflow to smoothly transition from the large-diameter main air supply pipe to the small-diameter first branch pipe, avoiding airflow turbulence caused by sudden changes in pipe diameter.

[0011] Furthermore, the outer ring walls of the main air supply pipe, the first branch pipe, and the second branch pipe are all covered with a heat insulation layer. The heat insulation layer is made of rubber and plastic sponge, and its inner wall is in contact with the outer ring walls of the main air supply pipe, the first branch pipe, and the second branch pipe. This structure can prevent the preheated air in the air supply pipe from losing heat during the transportation process, and ensure that the temperature deviation between the air discharged from the air outlet and the air temperature in the spiral pipe is reduced.

[0012] Furthermore, the air intake assembly includes a mounting base that fits into the wall. One end of the mounting base is connected to an L-shaped air intake pipe, with the air inlet of the air intake pipe arranged vertically downwards. The other end of the mounting base is connected to a connecting pipe, and a filter screen, a baffle grille, and a duckbill valve are sequentially arranged inside the connecting pipe along the direction of the incoming airflow. The opening of the duckbill valve faces the spiral tube. The baffle grille includes a circular frame, and at least four blades are arranged radially at intervals on the inner wall of the frame. All blades are at a 45° angle to the plane of the frame in the same direction. Guided by the blades, outdoor air enters the connecting pipe and forms a spiral airflow, making the airflow pass through the duckbill valve more evenly, while extending the residence time of the airflow in the connecting pipe, preparing for subsequent heat exchange with the spiral tube.

[0013] Furthermore, the spiral tube is made of copper, and the outer ring wall of the exhaust pipe is coated with a graphene coating. The graphene coating can improve the heat conduction efficiency of the exhaust hose, reduce the thermal resistance between the exhaust pipe and the spiral tube, and ensure that the exhaust waste heat is efficiently transferred to the make-up air in the spiral tube.

[0014] The beneficial effects of this utility model are as follows: 1. This utility model introduces outdoor air through the air intake component. After heat exchange with the residual heat of the spiral tube and the exhaust pipe, it is delivered to the kitchen by the air supply component. This not only fills the negative pressure formed by the exhaust of the range hood and solves the problems of flame deviation, odor backflow, and airflow howling, but also avoids the cold air from directly entering the kitchen during the low-temperature season, which would cause the kitchen temperature to drop, thus improving the comfort of cooking.

[0015] 2. In this utility model, the annular heat transfer ribs on the outer ring wall of the spiral tube are integrally formed with the spiral tube, increasing the heat exchange area between the spiral tube and the flue pipe. Combined with the high thermal conductivity of the copper spiral tube, the efficiency of transferring waste heat from the flue to the make-up air is further improved, the preheating time of the make-up air is shortened, and the make-up air temperature is ensured to increase.

[0016] 3. In this utility model, the filter screen filters dust and impurities in the outdoor air to ensure clean air supply; the baffle guides the air to form a spiral airflow, so that the airflow enters the spiral tube evenly and improves the heat exchange uniformity; the duckbill valve prevents kitchen air from flowing back to the outside and also prevents outdoor debris from entering the pipe, ensuring stable operation of the device. Attached Figure Description

[0017] Figure 1 This is a top view of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of this utility model from a bottom view.

[0019] Figure 3 This is a schematic diagram of the assembly of the exhaust pipe, insulation pipe, spiral pipe, air inlet assembly, and air supply assembly of this utility model.

[0020] Figure 4This is a disassembly diagram of the insulation pipe, smoke exhaust pipe, spiral pipe, air inlet assembly, and air supply assembly of this utility model.

[0021] Figure 5 This is a disassembly diagram of the exhaust pipe and spiral pipe of this utility model.

[0022] Figure 6 This is a disassembly diagram of the air intake component of this utility model.

[0023] Figure 7 This is a schematic diagram of the air supply component structure of this utility model.

[0024] Figure 8 This is a schematic diagram of the spoiler grid structure of this utility model.

[0025] Attached reference numerals: 1. Exhaust pipe; 2. Check valve; 3. Spiral pipe; 3-1. Annular heat transfer fin; 4. Insulation pipe; 5. Air outlet; 6. Air inlet assembly; 6-1. Air inlet pipe; 6-2. Connecting pipe; 6-2.1. Filter screen; 6-2.2. Baffle; 6-2.2.1. Frame; 6-2.2.2. Blade; 6-2.3. Duckbill valve; 7. Air supply assembly; 7-1. Main air supply pipe; 7-2. First branch pipe; 7-3. Second branch pipe. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] like Figures 1 to 8 As shown, a range hood duct air pressure balancing device includes an exhaust pipe 1, which is a flexible hose made of aluminum foil composite fiberglass. One end of the exhaust pipe 1 is connected to the exhaust port of the range hood, and the other end is connected to the common flue through a check valve 2. A spiral tube 3 is wound around the outer ring wall of the exhaust pipe 1, and the winding trajectory of the spiral tube 3 is parallel to the axis of the exhaust pipe 1. An insulation tube 4 is sleeved around the spiral tube 3, and the insulation tube 4 is made of flame-retardant rubber and plastic sponge. An air outlet 5 is provided on the lower end face of the range hood. The air outlet 5 has a rectangular structure, and the opening of the air outlet 5 faces the cooking area below the range hood.

[0028] The end of the spiral tube 3 near the check valve 2 passes through the insulation pipe 4 and is connected to the air inlet assembly 6. The end of the air inlet assembly 6 away from the spiral tube 3 passes through the wall and extends to the outside, for introducing fresh outdoor air.

[0029] The end of the spiral tube 3 closest to the range hood passes through the insulation pipe 4 and is connected to the air supply component 7. The end of the air supply component 7 away from the spiral tube 3 is connected to the air outlet 5, which is used to deliver the preheated air in the spiral tube 3 to the kitchen.

[0030] Furthermore, multiple annular heat transfer ribs 3-1 are provided at intervals along the axis of the outer ring wall of the spiral tube 3. The annular heat transfer ribs 3-1 and the spiral tube 3 are integrally formed and the spacing between adjacent annular heat transfer ribs 3-1 is equal. The multiple annular heat transfer ribs 3-1 are all located on the outer ring wall of the spiral tube 3 inside the insulation pipe 4. By setting the annular heat transfer ribs 3-1, the contact area between the spiral tube 3 and the air inside the insulation pipe 4 can be increased, thereby improving the efficiency of transferring waste heat from the flue pipe 1 to the spiral tube 3.

[0031] Furthermore, the check valve 2 includes a mounting base, on which a first connecting ring is vertically mounted. The outer wall of the first connecting ring is tightly fitted to the inner wall of the exhaust pipe 1. A second connecting ring is provided on the mounting base around the outer periphery of the first connecting ring. The outer wall of the second connecting ring is tightly fitted to the inner wall of one end of the insulation pipe 4. The other end of the insulation pipe 4 is sealed to the exhaust port of the range hood. The length of the insulation pipe 4 covers the entire winding area of ​​the spiral pipe 3.

[0032] Furthermore, there are two air outlets 5, which are symmetrically distributed along the width of the range hood. The angle between the tilt direction of the air outlets 5 and the horizontal direction is 30° to 45°, and the tilt direction is consistent with the opening direction of the air outlets 5. This tilt angle and position design makes the preheated air discharged from the air outlets 5 form an "airflow barrier". On the one hand, it fills the negative pressure in the kitchen, and on the other hand, it guides the cooking fumes to converge into the smoke collection chamber of the range hood, reducing the spread and escape of fumes and helping to improve the exhaust efficiency of the range hood.

[0033] Furthermore, the air supply assembly 7 includes an air supply main pipe 7-1, with a first branch pipe 7-2 connected to the end of the air supply main pipe 7-1 away from the spiral pipe 3, and second branch pipes 7-3 connected to both ends of the first branch pipe 7-2, with the ends of the two second branch pipes 7-3 away from the first branch pipe 7-2 respectively connected to the air supply outlet 5.

[0034] Furthermore, a transition section is provided at the connection between the first branch pipe 7-2 and the main air supply pipe 7-1. The diameter of the transition section gradually decreases from the end of the main air supply pipe 7-1 to the end of the first branch pipe 7-2. The transition section allows the airflow to smoothly transition from the large-diameter main air supply pipe 7-1 to the small-diameter first branch pipe 7-2, avoiding airflow turbulence caused by sudden changes in pipe diameter.

[0035] Furthermore, the outer ring walls of the main air supply pipe 7-1, the first branch pipe 7-2, and the second branch pipe 7-3 are all covered with an insulation layer. The insulation layer is made of rubber and plastic sponge. The inner wall of the insulation layer is in contact with the outer ring walls of the main air supply pipe 7-1, the first branch pipe 7-2, and the second branch pipe 7-3. This structure can prevent the preheated air in the air supply pipe from losing heat during the transportation process, and ensure that the temperature of the air discharged from the air outlet 5 is reduced from the temperature of the air in the spiral pipe 3.

[0036] Furthermore, the air intake assembly 6 includes a mounting base that fits into the wall. One end of the mounting base is connected to an L-shaped air intake pipe 6-1, with the air inlet of the air intake pipe 6-1 arranged vertically downwards. The other end of the mounting base is connected to a connecting pipe 6-2. Inside the connecting pipe 6-2, along the direction of the incoming airflow, a filter screen 6-2.1, a baffle grille 6-2.2, and a duckbill valve 6-2.3 are arranged in sequence. The opening of the duckbill valve 6-2.3 faces the spiral tube 3. The baffle grille 6-2.2 includes a circular frame 6-2.2. 1. The inner wall of the frame 6-2.2.1 is provided with at least 4 blades 6-2.2.2 at radial intervals. All blades 6-2.2.2 are arranged in the same direction at a 45° angle to the plane of the frame 6-2.2.1. Guided by the blades 6-2.2.2, the outdoor air enters the connecting pipe 6-2 and forms a spiral airflow, so that the airflow passes through the duckbill valve 6-2.3 more evenly, and at the same time prolongs the residence time of the airflow in the connecting pipe 6-2, in preparation for subsequent heat exchange with the spiral tube 3.

[0037] Furthermore, the filter screen 6-2.1 has four elastic lugs spaced circumferentially on its annular wall, and the inner wall of the connecting pipe 6-2 has an annular groove that matches the elastic lugs. In the assembled state, the elastic lugs are snapped into the snap-fit ​​groove; the baffle 6-2.2 is installed with an interference fit to the inner wall of the connecting pipe 6-2.

[0038] Furthermore, the spiral tube 3 is made of copper, and the outer ring wall of the exhaust pipe 1 is coated with a graphene coating. The graphene coating can improve the heat conduction efficiency of the exhaust pipe 1, reduce the thermal resistance between the exhaust pipe 1 and the spiral tube 3, and ensure that the exhaust waste heat is efficiently transferred to the make-up air in the spiral tube 3.

[0039] The working principle of this utility model: 1. After the range hood is started, the built-in fan draws out the fumes, which enter the exhaust pipe 1. The kitchen is then under negative pressure, and outdoor air enters the L-shaped air inlet pipe 6-1 of the air inlet assembly 6 under the action of the air pressure difference.

[0040] 2. Air enters the connecting pipe 6-2 and passes sequentially through the filter screen 6-2.1 (filtering fine dust), the baffle 6-2.2 (the blades 6-2.2.2 guide the spiral airflow), and the duckbill valve 6-2.3 (preventing backflow of air) before entering the spiral pipe 3.

[0041] 3. The high-temperature oil fumes inside the exhaust pipe 1 are transferred to the outside of the exhaust pipe 1 through the graphene coating, and then the heat is transferred to the air inside the spiral tube 3 made of copper, which raises the air temperature; the insulation pipe 4 completely wraps the spiral tube 3 to reduce heat loss.

[0042] 4. The preheated air enters the air supply assembly 7 and is distributed to the two air outlets 5 via the main air supply pipe 7-1, the first branch pipe 7-2, and the second branch pipe 7-3.

[0043] 5. Air is discharged from the air outlet 5 at an angle of 30° to 45°, which on the one hand fills the negative pressure in the kitchen (balances the air pressure and prevents the flame from shifting and the odor from spreading), and on the other hand forms an airflow barrier to guide the fumes to converge into the smoke collection chamber of the range hood and reduce escape. 6. After the range hood stops working, the duckbill valve 6-2.3 will automatically close to prevent kitchen air from flowing back to the outside.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressure balancing device for a range hood duct, comprising an exhaust pipe, one end of which is connected to the exhaust port of the range hood, and the other end of which is connected to a common flue via a check valve, characterized in that, A spiral tube is wound around the outer ring wall of the exhaust pipe, and the winding trajectory of the spiral tube is parallel to the axis of the exhaust pipe; an insulation tube is sleeved around the outer periphery of the spiral tube; an air outlet is provided on the lower end face of the range hood, and the opening of the air outlet faces the cooking area below the range hood. The end of the spiral tube near the check valve passes through the insulation pipe and is connected to the air inlet assembly. The end of the air inlet assembly away from the spiral tube passes through the wall and extends to the outside. The end of the spiral tube closest to the range hood passes through the insulation pipe and is connected to the air supply component, while the end of the air supply component away from the spiral tube is connected to the air outlet.

2. The range hood duct air pressure balancing device according to claim 1, characterized in that, Multiple annular heat transfer ribs are provided at intervals along the axis of the outer ring wall of the spiral tube, with the spacing between adjacent annular heat transfer ribs being equal, and all annular heat transfer ribs are located on the outer ring wall of the spiral tube inside the insulation tube.

3. The range hood duct air pressure balancing device according to claim 1, characterized in that, One end of the insulation pipe is sealed to the check valve, and the other end is sealed to the exhaust port of the range hood. The length of the insulation pipe covers the entire winding area of ​​the spiral pipe.

4. The range hood duct air pressure balancing device according to claim 1, characterized in that, There are two air outlets, which are symmetrically distributed along the width of the range hood. The angle between the tilt direction of the air outlet and the horizontal direction is 30° to 45°, and the tilt direction is consistent with the opening direction of the air outlet.

5. The range hood duct air pressure balancing device according to claim 4, characterized in that, The air supply assembly includes a main air supply pipe, a first branch pipe connected to the end of the main air supply pipe away from the spiral tube, and second branch pipes connected to both ends of the first branch pipe. The ends of the two second branch pipes away from the first branch pipe are respectively connected to the air outlet.

6. The range hood duct air pressure balancing device according to claim 5, characterized in that, A transition section is provided at the connection between the first branch pipe and the main air supply pipe, and the diameter of the transition section gradually decreases from the end of the main air supply pipe to the end of the first branch pipe.

7. The range hood duct air pressure balancing device according to claim 5, characterized in that, The outer ring walls of the main air supply pipe, the first branch pipe, and the second branch pipe are all covered with a heat insulation layer. The heat insulation layer is made of rubber and plastic sponge, and its inner wall is attached to the outer ring walls of the main air supply pipe, the first branch pipe, and the second branch pipe.

8. The range hood duct air pressure balancing device according to claim 1, characterized in that, The air intake assembly includes a mounting base that fits into the wall, one end of which is connected to an L-shaped air intake pipe, and the air intake of the air intake pipe is arranged vertically downwards. The other end of the mounting base is connected to a connecting pipe. Inside the connecting pipe, along the direction of the incoming airflow, a filter screen, a baffle grille, and a duckbill valve are arranged in sequence, with the opening of the duckbill valve facing the spiral tube. The spoiler grid includes a circular frame, and at least four blades are arranged radially on the inner wall of the frame. All blades are arranged in the same direction at a 45° angle to the plane of the frame.

9. The air pressure balancing device for the range hood duct according to claim 1, characterized in that, The spiral tube is made of copper, and the outer ring wall of the exhaust pipe is coated with a graphene coating.

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