A bladeless range hood

Abstract

The utility model discloses a kind of bladeless range hood, wherein range hood includes: shell, is equipped with suction port, air inlet and air outlet, suction port is attached with oil cup;Vacuum generator is installed in shell, and the vacuum generator includes tube body, air inlet, exhaust port and suction port are equipped on tube body, suction port is connected with suction port, exhaust port is connected with air outlet;Exhaust fan is installed in shell and is located suction port side, tube body side wall separates exhaust fan and suction port in two areas, the exhaust end of the exhaust fan is connected with the air inlet of vacuum generator, the air inlet of exhaust fan is connected with extension pipe, this extension pipe passes through from air inlet and extends to bathroom or dining area.The utility model avoids the contact of exhaust fan and oil fume by vacuum generator, reduces cleaning frequency, prolongs service life, simultaneously exhausts from place outside kitchen, saves exhaust fan cost, saves energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, specifically a bladeless range hood. Background Technology

[0002] As a core piece of equipment in modern kitchens, range hoods play a vital role in extracting cooking fumes and maintaining indoor air quality. Traditional range hoods generally employ a fan structure, where an internal motor drives an impeller to rotate at high speed. Through centrifugal force or negative pressure, a low-pressure zone is created at the air inlet, drawing in cooking fumes and guiding them through the impeller to the exhaust pipe for expulsion. However, during the flow of fumes, the grease carried by the fumes inevitably comes into contact with the surface of the high-speed rotating impeller, causing grease to accumulate rapidly on the impeller blades. This accumulation not only significantly reduces the aerodynamic efficiency of the fan, resulting in reduced airflow and increased noise, but can also lead to equipment instability or even complete failure. After prolonged use, stubborn grease residue on the impeller surface requires deep manual cleaning to restore performance; this process is tedious and time-consuming, and frequent disassembly can damage the equipment structure.

[0003] To address the problem of grease adsorption, existing technologies attempt to melt the grease by heating the surface of components. However, this approach has several limitations: the energy conversion efficiency of the heating process is low, and the additional energy consumption significantly increases operating costs; at the same time, heating causes abnormal increases in the local ambient temperature in the kitchen, affecting cooking comfort and safety; more importantly, heating can only treat the grease that has already adhered, and cannot prevent the fumes from coming into contact with the impeller in the early stages of entering the exhaust fan. Therefore, the problem of grease deposition has not been fundamentally solved.

[0004] Furthermore, in residential or commercial spaces, the need for kitchen fume extraction often coexists with the ventilation needs of areas such as bathrooms and dining rooms. Currently, a common approach is to use separate configurations, where a dedicated range hood is installed in the kitchen, and additional exhaust fans are installed in the bathrooms or dining areas. When multiple areas require ventilation simultaneously, multiple motor-driven devices operate in parallel, resulting in redundant energy consumption and low overall energy efficiency. At the same time, this decentralized equipment layout not only increases initial procurement and installation costs but also increases space occupation and maintenance complexity, making it difficult to meet the energy-saving and integrated requirements of modern buildings.

[0005] For example, during cooking in a home kitchen, high-temperature fumes are drawn into the range hood through the smoke inlet, and grease accumulates on the surface of the fan impeller, reducing the fan's efficiency. Meanwhile, the bathroom exhaust fan needs to be started independently to remove moisture, resulting in both devices consuming electricity simultaneously and leading to low energy efficiency. Furthermore, grease residue on the impeller requires regular deep cleaning, affecting the system's continuous operation, and the parallel operation of multiple exhaust devices keeps overall energy consumption at a consistently high level. Summary of the Invention

[0006] To solve the above-mentioned technical problems, this utility model provides a bladeless range hood.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A bladeless range hood, comprising: The casing is equipped with a smoke inlet, an air inlet, and an air outlet, with an oil cup attached to the smoke inlet; A vacuum generator is installed inside a housing. The vacuum generator includes a tube body with an air inlet, an air outlet, and an air intake. The air intake is connected to the smoke inlet, and the air outlet is connected to the air outlet. An exhaust fan is installed inside the housing and located on the side of the smoke inlet. The side wall of the pipe body separates the exhaust fan and the smoke inlet into two areas. The exhaust end of the exhaust fan is connected to the air inlet of the vacuum generator. An extension pipe is connected to the air inlet of the exhaust fan. The extension pipe passes through the air inlet and extends to the toilet or dining area.

[0008] As a further improvement, the pipe body includes an intake section, a transition section and an exhaust section. One end of the transition section is connected to the intake section and the other end of the transition section is connected to the exhaust section. The intake port is located in the intake section and the exhaust port is located in the exhaust section. The intake section is connected to the smoke inlet and the exhaust section is connected to the air outlet. The exhaust fan is located on one side of the intake section.

[0009] As a further improvement, the internal diameters of the intake section, transition section, and exhaust section of the pipe are equal.

[0010] As a further improvement, a vent pipe is installed and connected to the exhaust end of the exhaust fan or the air inlet of the vacuum generator. The vent pipe extends from the air inlet toward the exhaust port. The air outlet of the vent pipe is defined as the jet nozzle, which is located in the exhaust section or the inlet area of ​​the exhaust section. The outer diameter of the vent pipe is smaller than the inner diameter of the exhaust port.

[0011] As a further improvement, a check valve is installed inside the vacuum generator.

[0012] As a further improvement, the tube body is provided with an inclined oil-guiding sidewall, the upper end of which is connected to the sidewall of the vent pipe, and the lower end of which extends to the intake section.

[0013] As a further improvement, an oil mesh with several vent holes is installed at the smoke inlet of the housing. The oil mesh has several protruding conduits, and the sidewalls of the conduits have several through holes. The conduits protrude into the air intake section of the pipe body.

[0014] As a further improvement, the extension tube is a hollow rigid tube or flexible tube, with its outlet end connected to the air inlet end of the exhaust fan and its inlet end connected to the restroom or dining area.

[0015] As a further improvement, the exhaust fan is connected via a power cord to a first dual-control switch and a second dual-control switch, which are configured to have dual control functions. The first dual-control switch is installed in the area where the range hood is located, and the second dual-control switch is installed in the bathroom or dining area where the extension pipe extends.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: 1. By installing a separate vacuum generator inside the range hood, the exhaust fan and the smoke inlet are staggered. The exhaust fan creates negative pressure inside the vacuum generator, drawing in external cooking fumes through the suction port. The fumes are then exhausted through the exhaust port. During exhaust, the fumes do not pass through the exhaust fan, preventing the grease from contacting the fan impeller. This avoids the fan impeller absorbing too much grease, which could lead to a decrease in efficiency or even shutdown. This increases the efficient operating time of the exhaust fan. Furthermore, the fan impeller does not occupy the space of the exhaust channel at the suction port, allowing full use of the upward buoyancy of the fumes to improve the exhaust efficiency of the range hood and save energy.

[0017] 2. By extending the extension pipe to the bathroom or dining area, the range hood can extract air from these areas while it is running. This not only expands the range hood's operating range but also increases its exhaust volume and efficiency, thus providing ventilation in these areas. This saves on the need for a separate exhaust fan in the bathroom. Furthermore, the extracted air enters the range hood and exits directly from the exhaust vent, preventing backflow into the kitchen through the vacuum generator's intake. This allows for ventilation of the bathroom or dining area while the range hood is running. Additionally, a dual-control switch allows the exhaust fan in the bathroom or dining area to be turned on directly, achieving the same exhaust process. This separate exhaust does not affect the air quality in the kitchen area where the range hood is located, saving on exhaust fan installation costs. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the vacuum generator of this utility model; Figure 3 This is a schematic diagram of the extension tube of this utility model; Figure 4 This is a schematic diagram of the structure of the oil mesh in this utility model; Figure 5 This is a schematic diagram of the exhaust fan in this utility model; Figure 6 This is a schematic diagram of the structure of the dual-control switch in this utility model; Figure 7This is a partial cross-sectional schematic diagram of the assembly of the vent pipe and the vacuum generator tube in this utility model.

[0019] Figure label: 1. Exhaust port; 2. Oil cup; 3. Air jet port; 4. Bracket; 5. Vent pipe; 6. Air inlet; 7. Sealing plate; 8. Guide sidewall; 9. Housing; 10. Intake port; 11. Intake section; 12. Transition section; 13. Exhaust section; 14. Vacuum generator; 15. Toilet or dining area; 16. Conduit; 17. Connector; 18. Separator; 30. Exhaust fan; 31. Motor; 32. Impeller; 33. Intake end; 34. Exhaust end; 39. High flow zone edge; 41. Power cord; 50. Extension tube; 53. Oil filter; 70. Fixing bracket; 72. Smoke port; 75. First double-control switch; 76. Second double-control switch; 80. High flow zone; A. Terminal block; B. Contact post; C. Contact post; D. Contact piece; N. Insulating post; M. Switch button; K. Power supply; H. Double-control switch housing; W. Live wire; S. Neutral wire. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Example

[0023] like Figure 1-5 As shown, a bladeless range hood includes: a housing 9, which has a smoke inlet 72, an air inlet, and an air outlet, with an oil cup 2 connected to the smoke inlet 72; a vacuum generator 14, installed inside the housing 9, the vacuum generator 14 including a tube body, with an air inlet 6, an exhaust outlet 1, and an air intake 10 on the tube body, the air intake 10 being connected to the smoke inlet 72, and the exhaust outlet 1 being connected to the air outlet; and an exhaust fan 30, which has a motor 31, an impeller 32, an air inlet end 33, an exhaust end 34, and a power cord 41, installed inside the housing 9 and located on one side of the smoke inlet 72, the side wall of the tube body separating the exhaust fan 30 and the smoke inlet 72 into two areas, the exhaust end 34 of the exhaust fan 30 being connected to the air inlet 6 of the vacuum generator 14, and the air inlet end 33 of the exhaust fan 30 being connected to an extension pipe 50, which passes through the air inlet and extends to the bathroom or dining area 15 outside the kitchen. The fumes do not need to enter the exhaust fan for exhaust.

[0024] A vacuum generator is a device that uses Bernoulli's principle to create negative pressure in a specific area. It generates a low-pressure zone near the exhaust port of the tube by using high-speed airflow. Its main purpose is to allow oily fumes to be drawn in from the smoke inlet without passing through the exhaust fan impeller.

[0025] The exhaust fan can be a centrifugal or axial fan, and its installation position is separated from the smoke inlet by the side wall of the duct body, ensuring physical isolation between the oil fume area and the fan area, and preventing grease from accumulating inside the fan. The extension duct, which can be flexible or rigid, extends through the kitchen wall to a designated area, drawing air from the bathroom or dining area into the exhaust fan's intake. Its extension path passes through the housing from the intake and connects to the target area. Thus, this application utilizes the synergistic effect of the vacuum generator and the exhaust fan's airflow to create a high-flow area at the exhaust port, generating a negative pressure effect. This causes the oil fume gas to be drawn in through the intake and flow along the duct body to the exhaust port, while the exhaust fan draws air from other areas through the extension duct to enhance airflow intensity. Specifically, this structure avoids direct contact between oil fumes and the exhaust fan impeller, reducing grease adhesion to the impeller; the extension duct integrates the exhaust needs of the kitchen and other areas, reducing the energy consumption of separately installed exhaust equipment, eliminating the need for a separate exhaust fan in the bathroom; and for dining areas, especially restaurants, the installation of exhaust fans can be reduced.

[0026] The extension pipe 50 is either a rigid or flexible tube, with its outlet end connected to the air inlet end of the exhaust fan and its inlet end extending into the bathroom to stably extract stale air from the bathroom. This implementation ensures the flexibility and sealing of the airflow channel while maintaining the exhaust fan's ability to simultaneously process air from multiple areas. By integrating the exhaust functions of the kitchen and bathroom or dining area through the extension pipe, the need for separate exhaust equipment is reduced, thus lowering overall energy consumption.

[0027] As two preferred areas of this utility model, one is that the extension pipe extends to the bathroom, reducing the installation of bathroom exhaust fans, saving costs, and sharing a single exhaust fan with the range hood.

[0028] On the other hand, the extension pipe can be extended to the dining area, especially the restaurant area. For places like restaurants, the dining area needs to install a large number of exhaust fans. By using the extension pipe, the number of exhaust fans that need to be installed can be reduced.

[0029] In other words, when the range hood is actively absorbing oil fumes, it also exhausts air from the bathroom or dining area. When the range hood is not operating normally, you only need to turn on the switch separately to exhaust air from the bathroom or dining area. At this time, the exhaust fan is working. When there is no cooking in the kitchen, the exhaust fan only plays the role of exhausting and exchanging air.

[0030] Therefore, this utility model solution increases the operating range of the exhaust fan in the range hood on the one hand, and saves the cost of installing exhaust fans in other places on the other hand.

[0031] The pipe body includes an intake section 11, a transition section 12, and an exhaust section 13. One end of the transition section 12 is connected to the intake section 11, and the other end is connected to the exhaust section 13. An intake port 10 is located in the intake section 11, and an exhaust port 10 is located in the exhaust section 13. The intake section 11 is connected to a smoke inlet 72, and the exhaust section 13 is connected to an air outlet. A fan 30 is located on one side of the intake section 11. The transition section 12 is inclined or arc-shaped, which facilitates the sliding of grease accumulated on the inner wall of the pipe down to the intake port and then into the grease cup from the smoke inlet. The intake and exhaust sections are typically vertical. Example

[0032] like Figure 1-7 As shown, a vent pipe 5 is installed and connected to the exhaust end 33 of the exhaust fan 30 or the air inlet 6 of the vacuum generator 14. The vent pipe 5 extends from the air inlet 6 toward the exhaust port 1. The air outlet of the vent pipe is defined as the jet nozzle 3, which is located within the exhaust section 13 or in the inlet area of ​​the exhaust section 13. The outer diameter of the vent pipe 5 is smaller than the inner diameter of the exhaust port 1 to prevent the vent pipe 5 from blocking the exhaust port. The pipe body has a uniform cross-section to avoid airflow contraction or expansion effects caused by diameter changes. The air outlet of the vent pipe 5 forms the jet nozzle 3 of the vacuum generator, from which gas is ejected to the exhaust port.

[0033] Regarding the specific extension distance of the vent pipe, the connection point between the transition section 12 and the exhaust section 13 is defined as the separation point 18, and the jet nozzle 3 of the vent pipe 5 preferably extends to a position flush with the separation point 18.

[0034] The vent pipe refers to the flow guiding component used to constrain and guide airflow. It can be implemented using a rigid metal pipe or a flexible plastic pipe. The purpose is to prevent the airflow from diffusing and losing energy before entering the pipe body, ensuring that the airflow source is efficiently introduced into the key area. The extension direction of the vent pipe refers to the axial path from the air inlet to the air outlet. It can be designed as a straight line or with a gently curved shape, in order to reduce lateral turbulence and directional deviation and maintain the consistency of airflow direction. The air outlet position of the vent pipe refers to a specific point located inside the exhaust section or in the inlet area, such as the dividing point 18 defined above. It can be set near the inner wall of the exhaust section or at the inlet, in order to allow the high-speed airflow to directly act on the high-flow area of ​​the gas, while preventing the gas discharged from the vent pipe 5 from entering the interior of the transition section 12 and then being discharged into the kitchen through the air inlet and smoke outlet, thus avoiding backflow problems.

[0035] Furthermore, the dimensional relationship between the outer diameter of the vent pipe 5 and the inner diameter of the exhaust port 1 is such that the outer diameter of the vent pipe 5 is smaller than the inner diameter of the exhaust port 1, thus forming an annular gap between them. This gap can be achieved by matching different pipe diameters, with the aim of utilizing the fluid acceleration effect to increase airflow velocity and enhance the local low-pressure area. By setting the distance of the vent pipe, the formation process of the high-flow area of ​​gas is stabilized, negative pressure fluctuations are reduced, and the continuity of fume inhalation and overall fume extraction efficiency are improved.

[0036] By limiting the position of the air outlet of the vent pipe 5, it is ensured that the gas discharged from the vent pipe 5 will not touch the transition section 12 of the vacuum generator 14 and thus rebound to the suction section 11 and be discharged from the smoke outlet, causing gas pollution inside the kitchen.

[0037] In addition, a check valve is installed inside the vacuum generator 14. Depending on actual usage requirements, multiple check valves can be installed. For example, one check valve can be installed inside the transition section of the vacuum generator, and another check valve can be installed inside the exhaust section. The check valve opens with the intake port facing the exhaust port. A check valve is a one-way valve device that automatically controls the flow direction. It can be implemented using a duckbill valve, ball valve, or flap valve, etc. Its purpose is to trigger the valve's opening and closing action by changing the airflow direction, ensuring that the airflow can only flow in the set direction, thereby blocking the reverse airflow path.

[0038] When the exhaust fan stops running or the system pressure fluctuates, outside air or the oily fumes that have already been discharged may flow back into the vacuum generator through the exhaust port, causing the oily fumes to flow back into the smoke inlet area, resulting in secondary pollution of the kitchen environment or contamination of the grease in the oil cup, affecting the cleanliness and reliability of the equipment. The above problems can be solved by installing a check valve.

[0039] In addition, the internal diameters of the intake section 11, transition section 12 and exhaust section 13 of the pipe are equal, and the exhaust end 34, ventilation pipe 5, air inlet 6 and air outlet of the exhaust fan 30 are located on the same central axis.

[0040] By ensuring that the internal diameter of each section of the pipe remains consistent, a constant flow cross-section is maintained when the oil fume gas flows through the intake section, transition section, and exhaust section. This prevents abrupt changes in cross-section during the transition between sections, effectively reducing turbulence and energy loss. Due to the more uniform distribution of airflow velocity and pressure, oil droplets in the oil fume are less likely to detach from the airflow and adhere to the pipe wall due to sudden changes in flow velocity. At the same time, it ensures the stable formation of negative pressure inside the vacuum generator, providing a reliable foundation for the smooth discharge of oil fume.

[0041] By setting the diameter of each area of ​​the pipe to be the same, the disturbance and grease accumulation caused by the sudden change in diameter of the airflow are avoided, the flow resistance is reduced and the suction efficiency is improved, thereby extending the cleaning cycle of the equipment and improving the reliability of the range hood in long-term operation.

[0042] The vacuum generator can be made of high-temperature resistant rubber tubing or stainless steel tubing and installed as a separate component inside the range hood. Alternatively, the vacuum generator can be integrally molded inside the range hood's casing.

[0043] In addition, to ensure airtightness, all connection points, such as the exhaust port and air inlet, are sealed using gaskets or adhesive. Where the extension pipe passes through a wall, it can be sealed with sealant. A sealing plate 7 can be installed at the air inlet 6 of the vacuum generator, with the exhaust end of the exhaust fan connecting to the inlet via the sealing plate 7 to ensure a tight seal.

[0044] Preferred locations, such as Figure 7 As shown, the sealing plate 7 completely seals the gap between the exhaust end 34 of the exhaust fan 30 or the outer wall of the vent pipe 5 and the wall of the inlet 6. The vacuum generator 14 can be fixedly mounted inside the housing 9 by the fixed bracket 70 or by screws. The vent pipe 5 can be kept in the middle position of the exhaust section 13 in the vacuum generator 14 by the bracket 4.

[0045] In addition, the tube body is provided with an inclined oil-guiding sidewall 8, the upper end of which is connected to the sidewall of the vent pipe 5, and the lower end of which extends to the suction section 11. The oil-guiding sidewall can be a separate component or a sidewall formed inside the tube body.

[0046] The inclined structure of the oil-guiding sidewall, connected to the vent pipe and intake section, creates a continuous grease flow path. The upper end of the oil-guiding sidewall connects to the vent pipe sidewall, allowing grease formed in the high-flow area to flow directly into it. The inclined design utilizes gravity to guide the grease downwards. The lower end extends to the intake section, guiding the grease to the vicinity of the intake section, where it finally flows into the grease cup for collection. This design effectively reduces grease residue in key airflow paths within the pipe body, maintaining negative pressure and smoke extraction efficiency.

[0047] The oil guide sidewall can be made of stainless steel with a polished surface to enhance its oleophobicity, or the hose can be made with a smooth surface. Its upper end is firmly connected to the outer wall of the vent pipe by welding. Its lower end extends into the interior of the suction section, close to the oil cup installation position. Example

[0048] like Figure 1-6As shown, an oil mesh 53 with several vent holes is installed at the smoke inlet 72 of the housing 9. This oil mesh 53 can filter out harmful substances in the fumes, preventing these substances from being emitted into the atmosphere through the exhaust section 13 and polluting the environment. The oil mesh 53 has several protruding n-shaped conduits 16, and the sidewalls of the conduits 16 have several through holes. The conduits 16 protrude into the intake section 11 of the pipe body. By setting the protruding conduits, the contact area is increased, thereby increasing the intake volume.

[0049] The duct has a hollow internal structure with an opening at the bottom to facilitate the entry of oil fumes. Once inside, the fumes are discharged into the vacuum generator through through-holes in the side wall of the duct. The duct wall is densely covered with through-holes, and there are gaps between the ducts, allowing for filtration and discharge of oil fumes from all sides and the top of each duct. Increasing the height or thickness of the oil mesh expands its surface area. Because the two oil meshes have the same pore diameter, the larger surface area allows for more pores and thus a greater exhaust volume. Even if some pores are partially blocked by grease, the exhaust efficiency will not be significantly affected. This results in stronger anti-clogging capabilities.

[0050] The main body of the catheter is made of rigid metal or plastic. It can also be made of elastic materials such as metal wire or plastic wire. The elasticity of the catheter allows it to bend and pass through curved pipes. The height of the catheter is no longer limited by the bending of the pipes and can be further increased, improving exhaust efficiency.

[0051] Although the oil filter increases the surface area of ​​the oil filter, it only increases the height or thickness of the oil filter. The duct is hidden inside the air intake section and the transition section, so it does not take up space in the range hood. On the one hand, it avoids increasing the size of the range hood by increasing the surface area of ​​the oil filter, and on the other hand, it avoids the range hood being too large and taking up too much kitchen space.

[0052] The oil filter can be installed by snap-fit ​​or screws to lock it to the housing.

[0053] Several conduits 16 can form a three-dimensional honeycomb structure, and each conduit 16 can be connected to the other conduits 17 to ensure the reliability of stability.

[0054] Of course, the oil mesh can also be made into a planar structure, but its effect is not as superior as that of a conduit.

[0055] In addition, the exhaust fan 30 is connected to a first dual-control switch 75 and a second dual-control switch 76 with dual-control function via a power cord 41. The first dual-control switch 75 is installed in the area where the range hood is located, and the second dual-control switch 76 is installed in the bathroom or dining area where the extension pipe extends.

[0056] A control circuit system capable of independent operation in two locations is constructed by electrically connecting the exhaust fan to two dual-control switches. The first dual-control switch is located in the area where the range hood is located, allowing users to directly control the equipment during cooking. The second dual-control switch is located in the bathroom or dining area where the extension pipe extends, matching the control point to the user's activity location. This setup fully utilizes the structural feature of the extension pipe extending to multiple areas, allowing users to directly switch the exhaust fan status when operating the switch in either area, thereby eliminating the operational delay caused by fixed switch positions and improving the equipment's response efficiency.

[0057] The first double-pole switch is installed at normal operating height on the kitchen wall, and the second double-pole switch is installed in a conspicuous area on the bathroom wall. The two switches are connected by standard wiring to form a double-control circuit. Users can start or stop the exhaust fan by pressing either switch in either the kitchen or bathroom without having to move to another area. Double-pole switches are a type of switch in existing technology and are not limited to a specific model.

[0058] This application enables independent control of multiple zones of the exhaust fan, effectively solving the problem of inconvenience for users in the extension area of ​​the extension pipe, avoiding energy waste caused by back-and-forth movement, and improving the convenience and practicality of the equipment.

[0059] like Figure 6 As shown, the power cord 41 of the exhaust fan 30 is connected to the power supply through two identical double-control switches, the first double-control switch 75 and the second double-control switch 76. The first double-control switch and the second double-control switch have the same structure. The first double-control switch 75 includes: a housing H, a terminal A, two separate contact terminals B and C, a contact piece D, an insulating post N, and a switch button M. The terminal A and the contact piece D are connected. The contact piece D is connected to the switch button M through the insulating post N. The contact piece D can be arbitrarily connected to either contact terminal B or C by moving the switch button M up and down.

[0060] The first double-control switch 75 contact post B and the second double-control switch 76 contact post B are connected by a cable. The first double-control switch 75 contact post C and the second double-control switch 76 contact post C are also connected by a cable. The terminal A of the first double-control switch 75 is connected to the live wire W of the power supply K. The terminal A of the second double-control switch 76 is connected to the live wire W of the exhaust fan power supply line 41. The neutral wire S of the exhaust fan power supply line 41 is connected to the neutral wire S of the power supply K.

[0061] Each dual-control switch can independently control the on / off state of the exhaust fan 30 in the range hood. Dual-control switches 75 and 76 are installed in the kitchen and bathroom respectively. When people need to ventilate the kitchen, they can toss the button M of dual-control switch 75 up and down to control the exhaust fan 30, thus controlling whether the range hood starts or stops ventilating. When people need to ventilate the bathroom, they can toss the button M of dual-control switch 76 up and down to control the exhaust fan 30, thus controlling whether the range hood starts or stops ventilating. This avoids the need for people to walk back and forth between two locations to use the range hood, expanding the range of control and improving the ease of use of the range hood.

[0062] According to the Chinese standard GB / T 18204.1-2025, "Hygienic Inspection Methods for Public Places Part 1: Physical Indicators," there are strict requirements for air quality in public places. For example, there are specific limits on pollutants such as O2 and CO2 in the air inside restaurants where guests dine, and these limits cannot be exceeded. The newly published GB / T 18204.1-2025 adds a fresh air volume standard, which clearly stipulates the average amount of fresh air entering the room from the outside per person per unit time, expressed in cubic meters per person per hour (m³ / (person·h)). The formula for calculating fresh air volume is as follows: Where Q is the average fresh air volume per person, which is the average amount of air entering the room from the outside per person per unit time, expressed in cubic meters per person per hour (m³ / (person·h)); A is the number of air exchanges; and V is the indoor air volume, expressed in cubic meters (m³). 3 P represents the higher of the designed pedestrian flow and the actual maximum pedestrian flow, expressed in people.

[0063] Therefore, it is evident that exhaust fans are required in certain specific locations, and this application can reduce or replace individual exhaust fans, thereby reducing costs.

[0064] The working principle of this utility model is as follows: When the switch is turned on, the exhaust fan starts running, drawing air from the restroom or dining area through the extension pipe. The air enters the exhaust fan 30 through the extension pipe 50, and is discharged to the exhaust port 1 of the vacuum generator 14 through the exhaust end 33 of the exhaust fan 30. A high flow zone 80 of gas is formed between the air jet port and the exhaust section of the vent pipe, and the gas flows rapidly in the high flow zone. Using Bernoulli's principle, a negative pressure is formed inside the vacuum generator 14. The air pressure inside the suction port 10 of the vacuum generator 14 is lower than the external air pressure, causing the oily fumes to be drawn into the vacuum generator 14 through the suction port 10. The fumes then flow along the suction section 11, transition section 12, and exhaust section 13 of the vacuum generator 14 to the high-flow zone 80. There, the oily fumes mix with the gas drawn from the bathroom or dining area and are discharged outwards through the exhaust vent. The edge 39 of the high-flow zone ensures that the fumes do not bounce back into the transition section 12.

[0065] By combining a vacuum generator and an exhaust fan in a coordinated airflow manner, and introducing an extension pipe connecting to the bathroom or dining area, a negative pressure is created in the high-flow area of ​​the gas to draw in cooking fumes and isolate the exhaust fan from contact with the fumes, thus avoiding the problem of grease buildup on the exhaust fan impeller. Simultaneously, by integrating the exhaust needs of multiple areas through the extension pipe, the installation of separate exhaust equipment is reduced, achieving the effect of lower energy consumption and manufacturing costs. Specifically, the exhaust fan only processes the air introduced through the extension pipe, ensuring that its interior is free of grease contamination and maintaining long-term high-efficiency operation. Inside the vacuum generator, in the exhaust port area, a high-flow area of ​​gas is created due to the continuously blowing, rapidly flowing gas from the exhaust fan, creating a suction effect on the internal space of the vacuum generator, thereby generating a stable negative pressure to drive the flow of cooking fumes. The path of the cooking fumes is completely isolated from the exhaust fan, fundamentally eliminating the risk of grease adhesion. The extension pipe design allows for the sharing of exhaust systems between the kitchen and adjacent areas, avoiding energy waste and increased hardware costs caused by installing additional exhaust fans. This technical solution effectively solves the technical problems of reduced efficiency due to grease adsorption on the exhaust fan impeller and high energy consumption of independent exhaust equipment in multiple areas.

[0066] Furthermore, this application avoids placing the exhaust fan's air intake inside the kitchen. If the exhaust fan's air intake is located inside the kitchen, it will draw in air from inside the kitchen. Although most cooking fumes enter through the smoke inlet, the strong suction at the exhaust fan's air intake will draw in fumes from near the smoke inlet, especially noticeable in smaller kitchens. Therefore, a small amount of fumes will still be drawn into the exhaust fan's air intake. Moreover, drawing in fresh air from the kitchen is not conducive to maintaining a clean environment and will also cause grease to adhere to the exhaust fan's impeller. Therefore, it is necessary to extend the exhaust pipe to other areas, such as the bathroom or dining area, to solve the exhaust problem in these areas and reduce the cost of installing separate exhaust fans.

[0067] The exhaust section 13 is connected to the exhaust area outside the kitchen through the exhaust pipe. The angle between the exhaust pipe and the exhaust section 13 is greater than 90 degrees and less than 180 degrees, preferably around 150 degrees. This allows the gas in the high flow zone 80 to come into 360-degree contact with the inner wall of the end of the exhaust section 13 before being discharged from the exhaust port 1, forming an air seal to enhance the suction of the vacuum generator.

[0068] Preferably, the exhaust volume of the exhaust fan 30 is calculated by the exhaust volume Q being equal to the wind speed V and the exhaust end 34 of the exhaust fan 30. The product of cross-sectional areas F is given by the formula Q = V × F, where wind speed V is in meters per second (m / s), cross-sectional area F is in square meters (m²), s represents time in seconds, m represents length, and exhaust volume Q is in cubic meters per second (m³ / s). 3 / s.

[0069] Preferably, as described above, the maximum flow rate of gas discharged per second from the exhaust end 34 of the exhaust fan 30 is the exhaust volume of the exhaust fan 30.

[0070] Preferably, as described above: In this utility model, the air intake end 33 at the rear of the exhaust fan 30 of the kitchen range hood is extended from the kitchen to the bathroom or dining area 15 via an extension pipe 50, thus expanding the operating range of the range hood from the kitchen to the bathroom or dining area 15. After the exhaust fan 30 is started, the air intake end 33 at the rear of the exhaust fan 30 draws in the stale air in the bathroom or dining area 15 through the inlet end of the extension pipe 50, and then discharges it to the outside of the kitchen through the exhaust end 34 of the exhaust fan 30, the high-flow gas zone 80, the exhaust port 1 of the vacuum generator 14, and the exhaust pipe. The maximum amount of gas discharged per second by the exhaust end 34 of the exhaust fan 30 is already the maximum exhaust volume of the exhaust fan 30. In front of the exhaust end 34 of the exhaust fan 30, through the transition section 12, the suction section 11, and the smoke inlet 72, the smoke-containing gas in the kitchen is absorbed. The additional exhaust volume discharged outside the kitchen through exhaust section 13 and the exhaust pipe is extra. Therefore, compared with existing technology, this utility model not only expands the operating range of the exhaust fan 30 in the range hood, but also increases the exhaust volume of the exhaust fan 30 without increasing its energy consumption. As described above, this utility model not only expands the operating range of the range hood but also improves its exhaust volume and working efficiency, thus saving energy.

[0071] The exhaust end 34 of the exhaust fan 30 and the jet nozzle 3 of the vent pipe 5 have the same shape, diameter, and cross-sectional area. Therefore, the exhaust volume of the exhaust end 34 of the exhaust fan 30 and the exhaust volume of the jet nozzle 3 are the same.

[0072] Preferably, the oil cup 2 is bowl-shaped, with vent holes at the top to facilitate the passage of oil fumes, and no vent holes at the middle and lower ends, which are used to collect and store the grease dripping from the vacuum generator 14.

[0073] The pipe walls at the connection points of the transition section with the intake section and the exhaust section, the connection point of the intake port with the intake section, the connection point of the exhaust port with the exhaust section, and the connection point of the intake section with the smoke inlet are sealed by welding, or preferably by at least one of the following: threaded connection, snap-fit ​​connection, and magnetic connection, while the pipes are interconnected.

[0074] It should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bladeless range hood, characterized in that, include: The casing is equipped with a smoke inlet, an air inlet, and an air outlet, with an oil cup attached to the smoke inlet; A vacuum generator is installed inside a housing. The vacuum generator includes a tube body with an air inlet, an air outlet, and an air intake. The air intake is connected to the smoke inlet, and the air outlet is connected to the air outlet. An exhaust fan is installed inside the housing and located on the side of the smoke inlet. The side wall of the pipe body separates the exhaust fan and the smoke inlet into two areas. The exhaust end of the exhaust fan is connected to the air inlet of the vacuum generator. An extension pipe is connected to the air inlet of the exhaust fan. The extension pipe passes through the air inlet and extends to the toilet or dining area.

2. The bladeless range hood according to claim 1, characterized in that, The pipe body includes an intake section, a transition section and an exhaust section. One end of the transition section is connected to the intake section and the other end of the transition section is connected to the exhaust section. The intake port is located in the intake section and the exhaust port is located in the exhaust section. The intake section is connected to the smoke inlet and the exhaust section is connected to the air outlet. The exhaust fan is located on one side of the intake section.

3. The bladeless range hood according to claim 2, characterized in that, The exhaust end of the exhaust fan or the air inlet of the vacuum generator is connected to a vent pipe. The vent pipe extends from the air inlet toward the exhaust port. The air outlet of the vent pipe is defined as the jet nozzle. The jet nozzle is located in the exhaust section or the inlet area of ​​the exhaust section. The outer diameter of the vent pipe is smaller than the inner diameter of the exhaust port.

4. The bladeless range hood according to claim 1, characterized in that, The vacuum generator is equipped with a check valve.

5. The bladeless range hood according to claim 4, characterized in that, The tube body is provided with an inclined oil-guiding sidewall, the upper end of which is connected to the sidewall of the vent pipe, and the lower end of which extends to the air intake section.

6. The bladeless range hood according to claim 2, characterized in that, The smoke inlet of the casing is equipped with an oil mesh with several vent holes. The oil mesh has several protruding guide tubes, and the sidewalls of the guide tubes have several through holes. The guide tubes protrude into the air intake section of the casing.

7. The bladeless range hood according to claim 1, characterized in that, The extension tube is a hollow rigid tube or flexible tube. The outlet end of the extension tube is connected to the air inlet end of the exhaust fan, and the inlet end of the extension tube is connected to the toilet or dining area.

8. The bladeless range hood according to claim 1, characterized in that, The exhaust fan is connected to a first dual-control switch and a second dual-control switch via a power cord. The first dual-control switch is installed in the area where the range hood is located, and the second dual-control switch is installed in the bathroom or dining area where the extension pipe extends.

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