CN110454830B - A suction and exhaust device - Google Patents

Abstract

The present invention belongs to the technical field of range hoods, and discloses an air intake and exhaust device, including an inner shell and an outer shell; the outer shell is sleeved outside the inner shell, an air flow channel is formed between the outer shell and the inner shell, and an air blowing port connected to the air flow channel is provided on the outer shell; an isolation air curtain nozzle connected to the air flow channel is provided between the outer shell and the inner shell, and air enters the air flow channel from the air blowing port and is ejected from the isolation air curtain nozzle to form an isolation air curtain; the inner shell has an air intake cavity for allowing smoke to pass through, and the side wall of the inner shell is also provided with a rotating air curtain nozzle that is connected to the air flow channel and can form a rotating air curtain with the gas entering the air flow channel from the air blowing port. The air intake and exhaust device of the present invention solves the problem of poor suction effect of the current air intake and exhaust device and top suction type air hood by combining the isolation air curtain and the rotating air curtain.

Description

A suction and exhaust device

Technical Field

The invention belongs to the technical field of range hoods, and in particular relates to an exhaust device.

Background Art

Range hoods are the main means of collecting oil fumes in kitchens. How to improve the suction efficiency of range hoods has always been an important part of range hood design and research. When traditional suction and exhaust devices and top suction hoods are sucking air, air and contaminated areas will enter through the air inlet and then be discharged to the outside through the exhaust duct. The air flow rate near the air inlet is relatively large, while the air flow rate far from the air inlet will drop rapidly as the distance from the air inlet increases. Therefore, within a very short distance below the air inlet, the upward speed of the air has become very small, making the upward suction force insufficient and easily affected by external factors, such as people walking, fans or air conditioners running, etc., which can disturb the airflow, so that the oil fume or pollutants escape with the flow of disturbed airflow.

Summary of the invention

In view of this, in order to solve the problem that the current suction and exhaust devices and top suction hoods have poor suction effects, the present invention provides a suction and exhaust device.

An air intake and exhaust device comprises an inner shell and an outer shell; the outer shell is sleeved outside the inner shell, an air flow channel is formed between the outer shell and the inner shell, and an air blowing port connected to the air flow channel is arranged on the outer shell;

An isolation air curtain nozzle connected to the air flow channel is arranged between the outer shell and the inner shell, and air enters the air flow channel from the air blowing port and is ejected from the isolation air curtain nozzle to form an isolation air curtain;

The inner shell is provided with an air inhalation cavity for allowing smoke to pass through, and the side wall of the inner shell is also provided with a rotating air curtain nozzle which is connected with the air flow channel and can form a rotating air curtain with the gas entering the air flow channel from the blowing port.

Preferably, the air intake and exhaust device also includes a partition; the partition is arranged in the air flow channel, and the partition divides the air flow channel into a first air flow channel and a second air flow channel, the first air flow channel is connected to the rotating air curtain nozzle, and the second air flow channel is connected to the isolation air curtain nozzle.

Preferably, the upper end of the partition is lower than the air opening.

Preferably, the inner wall of the outer shell is provided with at least two airflow dividing plates for guiding the flow, and the airflow dividing plates are arranged in a radial manner in a spaced relationship within the isolation air curtain nozzle.

Preferably, the spacing distance between two adjacent air flow dividing plates is 8-20 mm, and the axial length of the air flow dividing plate is greater than 20 mm.

Preferably, the inner shell is trumpet-shaped, and the cross-sectional area of one end of the inner shell close to the isolation air curtain nozzle is larger than the cross-sectional area of one end of the inner shell away from the isolation air curtain nozzle.

Preferably, the included angle θ between the generatrix at the lower portion of the inner shell side wall and the central axis of the inner shell is 20° to 70°.

Preferably, the air flow channel is trumpet-shaped, and the cross-sectional area of the end thereof close to the isolation air curtain nozzle is larger than the cross-sectional area of the end thereof away from the isolation air curtain nozzle.

Preferably, the opening direction of the rotating air curtain nozzle is arranged tangentially with respect to the generatrix of the inner shell side wall.

Preferably, the number of the rotating air curtain nozzles is at least three, and the rotating air curtain nozzles are arranged around the air flow channel.

Compared with the prior art, the beneficial effects of the above solution adopted by the air intake and exhaust device of the present invention are as follows:

The present invention designs a device that can significantly improve the suction and exhaust effects by combining an isolation air curtain and a rotating air curtain. The device is provided with a rotating air curtain nozzle on the side wall of an inner shell. After the gas entering the air flow channel from the blowing port flows out from the rotating air curtain nozzle, a rotating air curtain can be formed in the suction cavity; the gas entering the air flow channel from the blowing port is ejected through the isolation air curtain nozzle to form an isolation air curtain;

Due to the existence of the rotating air curtain, when the upper air inlet of the air inlet cavity begins to draw air, the air flow in the air inlet cavity will flow upward in a spiral, and the rotational energy of the spiral air flow will be transmitted downward, so that a weaker spiral air flow will be formed in the air inlet flow field outside the lower air inlet of the air inlet cavity, thereby effectively improving the suction effect and preventing the smoke and pollutants being drawn from escaping;

Due to the existence of the isolation air curtain, the isolation air curtain is equivalent to an air hood relative to the rotating air curtain, which can prevent external airflow from interfering with the gas flow inside the air hood; it can prevent the clean air outside the air hood from entering the air hood as much as possible, while increasing the flow rate of the gas inside the air hood; it can make the negative pressure distance of the air intake port larger and improve the suction effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a perspective view of an air intake and exhaust device provided by an embodiment of the present invention;

FIG2 is a cross-sectional view of FIG1;

FIG3 is a three-dimensional view of an air intake and exhaust device provided by an embodiment of the present invention in another visual state;

In the figure: 1. inner shell; 2. outer shell; 3. air flow channel; 4. partition; 11. air suction cavity; 12. rotating air curtain nozzle; 21. air blowing port; 22. air flow dividing plate; 31. first air flow channel; 32. second air flow channel; 33. isolation air curtain nozzle.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

The present embodiment provides an air intake and exhaust device, as shown in FIGS. 1 to 3 , comprising an inner shell 1 and an outer shell 2; the outer shell 2 is sleeved outside the inner shell 1, the outer shell 2 and the inner shell 1 form an air flow channel 3, and the outer shell 2 is provided with an air blowing port 21 connected to the air flow channel 3;

An isolation air curtain nozzle 33 connected to the air flow channel 3 is provided between the outer shell 2 and the inner shell 1. Air enters the air flow channel 3 from the air blowing port 21 and is ejected from the isolation air curtain nozzle 33 to form an isolation air curtain.

The inner shell 1 has an air intake cavity 11 for allowing smoke to pass through. The side wall of the inner shell 1 is also provided with a rotating air curtain nozzle 12 which is connected to the air flow channel 3 and can form a rotating air curtain with the gas entering the air flow channel 3 from the blowing port 21.

Because the side wall of the inner shell 1 is provided with a rotating air curtain nozzle 12, and an isolation air curtain nozzle 33 connected to the air flow channel 3 is provided between the outer shell 2 and the inner shell 1, part of the air flow entering the air flow channel 3 from the blowing port 21 will flow out from the rotating air curtain nozzle 12 to form a rotating air curtain, and the other part will be ejected from the isolation air curtain nozzle 33 to form an isolation air curtain. This embodiment significantly improves the air intake and exhaust effect by combining the isolation air curtain and the rotating air curtain;

Due to the existence of the rotating air curtain, when the upper air inlet of the air inlet channel 11 starts to draw air, the airflow in the air inlet channel 11 will flow upward in a spiral, and the rotational energy of the spiral airflow will be transmitted downward, so that a weaker spiral airflow is formed in the air inlet flow field outside the lower air inlet of the air inlet channel 11, thereby effectively improving the suction effect and preventing the smoke and pollutants being drawn from escaping;

Due to the existence of the isolation air curtain, the isolation air curtain is equivalent to an air hood relative to the rotating air curtain, which can prevent external airflow from interfering with the gas flow inside the air hood; it can prevent the clean air outside the air hood from entering the air hood as much as possible, while increasing the flow rate of the gas inside the air hood; it can make the negative pressure distance of the air intake port larger, thereby improving the suction effect.

In a specific embodiment, the air intake and exhaust device further includes a partition plate 4, which is arranged in the air flow channel 3, and the partition plate 4 divides the air flow channel 3 into a first air flow channel 31 and a second air flow channel 32, the first air flow channel 31 is connected to the rotating air curtain nozzle 12, and the second air flow channel 32 is connected to the isolation air curtain nozzle 33;

The partition 4 divides the airflow channel 3 into a first airflow channel 31 and a second airflow channel 32. Then, the airflow entering the airflow channel 3 from the air outlet 21 is divided into two parts by the partition 4 after passing through the partition 4, one part enters the first airflow channel 31, and the other part enters the second airflow channel 32.

In this embodiment, the bottom end of the partition plate 4 is sealed with the inner shell 1, so the gas entering the first air flow channel 31 can only flow out from the rotating air curtain nozzle 12 to form a rotating air curtain in the air suction channel 11; and the gas entering the second air flow channel 32 can only be ejected from the isolation air curtain nozzle 33 to form an isolation air curtain;

The provision of the partition 4 can reduce the mutual interference between the gases in the first air flow channel 31 and the second air flow channel 32, thereby making the air flow more stable.

In addition, the sizes of the first airflow channel 31 and the second airflow channel 32 can be changed by changing the radial distance of the partition 4; for example, when the radial distance of the partition 4 becomes smaller, the first airflow channel 31 becomes smaller, and the corresponding second airflow channel 32 becomes larger. At this time, the amount of air flowing through the first airflow channel 31 becomes smaller, while the amount of air flowing through the second airflow channel 32 becomes larger, and the gas flow rate flowing out of the rotating air curtain nozzle 12 and the gas flow rate flowing out of the isolation air curtain nozzle 33 both change accordingly.

In a specific implementation, the partition 4 may be an integrally formed whole, or may be formed by connecting a plurality of plates;

In a specific embodiment, the number of partitions 4 can be one or more, such as two, three, etc.; when the number of partitions is multiple, such as two, or three, etc., multiple partitions 4 are spaced apart and arranged in the airflow channel 3 to divide the airflow channel 3 into a first airflow channel 31 and a second airflow channel 32; when the number of partitions 4 is one, it directly divides the airflow channel 3 into a first airflow channel 31 and a second airflow channel 32, as shown in Figure 2, compared with the case where multiple partitions 4 are spaced apart, using one partition 4 can play a better role in stabilizing the flow.

In a specific embodiment, the upper end of the partition 4 is lower than the blowing port 21 , so as to ensure that the gas blown into the air flow channel 3 from the blowing port 21 can enter both the first air flow channel 31 and the second air flow channel 32 .

In this embodiment, the upper edge of the partition 4 is lower than the lower edge of the blowing port 21, as shown in Figure 2, so that the partition 4 can avoid blocking the gas blown in from the blowing port 21. Because if the upper edge of the partition 4 is higher than the lower edge of the blowing port 21 and lower than the upper edge of the blowing port 21, then part of the gas blown in from the blowing port 21 will not be able to enter the first air flow channel 31, which results in less gas entering the first air flow channel 31. If the gas flow rate in the first air flow channel 31 is small, there may be gas flowing out from the rotating air curtain nozzle 12, and the energy of the rotating airflow formed is low, which in turn affects the suction effect of this embodiment.

In a specific embodiment, at least two airflow dividing plates 22 for guiding airflow are disposed on the inner side wall of the outer shell 2, and the airflow dividing plates 22 are disposed in a radial manner in the isolation air curtain nozzle 33 at intervals from each other;

Due to the presence of the radially arranged airflow dividing plates 22, the gas in the airflow channel 3 flows in a direction away from the central axis of the inner shell 1, so that the radial distance of the formed isolation air curtain is longer; in addition, the airflow dividing plates 22 also have the function of stabilizing the airflow, ensuring that the gas flowing out of the outlet at the lower end of the airflow channel 3 can form a stable isolation air curtain;

In this embodiment, the lower end surface of the air flow dividing plate 22 is flush with the lower end surface of the outer shell 2, ensuring that the gas is guided by the air flow dividing plate 22 for a distance before flowing out of the air flow channel 3, thereby ensuring the stability of the isolation air curtain.

In a specific embodiment, the interval between two adjacent air flow dividing plates 22 is 8 to 20 mm, and the axial length of the air flow dividing plate 22 is greater than 20 mm. After testing, it is found that only when the interval between two adjacent air flow dividing plates 22 is 8 to 20 mm and the axial length of the air flow dividing plate 22 is greater than 20 mm, the air flow dividing plate 22 can play a better role in guiding and stabilizing the flow;

In this embodiment, the interval between two adjacent air flow dividers 22 is 15 mm, and the axial length of the air flow divider 22 is 30 mm.

In addition, in a specific embodiment, the specific number of the air flow dividing plates 22 provided is determined according to the circumferential distance of the isolation air curtain nozzles 33 .

In a specific embodiment, the inner shell 1 is trumpet-shaped, and the cross-sectional area of one end of the inner shell 1 close to the isolation air curtain nozzle 33 is larger than the cross-sectional area of one end of the inner shell 1 away from the isolation air curtain nozzle 33; the purpose is to enable the lower end of the inner shell 1 to include a larger suction area, so that the area of the rotating air curtain can be larger;

In a specific embodiment, the angle θ between the busbar at the lower part of the side wall of the inner shell 1 and the central axis of the inner shell 1 is 20°~70°. The purpose of this setting is to ensure that the gas flowing out from the second air flow channel 32 can form a complete and stable isolation air curtain after being guided and stabilized by the air flow dividing plate 22, and the isolation air curtain can prevent the external air flow from interfering with the air flow in the isolation air curtain, and at the same time prevent the clean air outside the isolation air curtain from entering the isolation air curtain.

When θ is less than 20° or greater than 70°, it may be difficult to form an isolation air curtain, or the formed isolation air curtain may be unstable, resulting in failure to prevent external airflow from interfering with the airflow inside the isolation air curtain, and failure to prevent clean air outside the isolation air curtain from entering the isolation air curtain.

In a specific embodiment, the air flow channel 3 is trumpet-shaped, and the cross-sectional area of the end close to the isolation air curtain nozzle 33 is larger than the cross-sectional area of the end away from the isolation air curtain nozzle 33. The purpose is to make the gas entering from the blowing port 21 gradually have a tendency to move around away from the central axis of the inner shell 1 when flowing in the air flow channel 3; at the same time, the gas ejected from the rotating air curtain nozzle 12 has a larger tangential velocity, which can better form a rotating airflow; the gas ejected from the isolation air curtain nozzle has a larger tangential velocity, which can form a wider range of isolation air curtain.

In a specific embodiment, the opening direction of the rotating air curtain nozzle 12 is arranged tangentially with respect to the generatrix of the side wall of the inner shell 1, so as to ensure that the gas entering the first air flow channel 31 from the blowing port 21 can better form a rotating air curtain after passing through the rotating air curtain nozzle 12, rather than being directly ejected from the rotating air curtain nozzle 12.

In this embodiment, the number of the rotating air curtain nozzles 12 is at least three, and the opening directions of the three rotating air curtain nozzles 12 are the same, so that the gas flowing out of the rotating air curtain nozzles 12 can more easily form a rotating air curtain.

In addition, while the opening of the rotating air curtain nozzle 12 is arranged tangentially with respect to the generatrix of the side wall of the inner shell 1, the opening of the rotating air curtain nozzle 12 can be inclined upward, horizontal, or inclined downward relative to the plane where the lower edge of the inner shell 1 is located;

When the rotating air curtain nozzle 12 is inclined upward, the upward energy of the rotating air curtain formed is higher, which is more conducive to improving the overall suction effect of the air intake and exhaust device of this embodiment.

In this embodiment, a baffle is provided on the rotating air curtain nozzle 12, and a gap for gas circulation is left between the baffle and the side wall of the inner shell 1, as shown in Figure 2; because the rotating air curtain nozzle 12 is arranged around the side wall of the inner shell 1, the baffle is also arranged around the side wall of the inner shell 1, and a gap for gas circulation is left between the baffle and the side wall of the inner shell 1, and the gap is arranged tangentially compared to the busbar of the side wall of the inner shell 1, so that the gas in the rotating air curtain channel 31 can better form a rotating air curtain when it flows out from the gap.

In a specific embodiment, the number of the rotating air curtain nozzles 12 is at least three, and the rotating air curtain nozzles 12 are arranged around the air flow channel 3; it is difficult to form a rotating airflow by only setting one or two rotating air curtain nozzles 12, and three rotating air curtain nozzles 12 may form a rotating airflow; in this embodiment, the number of the rotating air curtain nozzles 12 is six.

In a specific embodiment, the number of the air outlets 21 is at least one, for example, it can be two, three, etc. In the present embodiment, the number of the air outlets 21 is two, and the two air outlets 21 are symmetrically arranged with each other, in order to ensure that the gas flow rate flowing out of the rotating air curtain channel 31 and the isolation air curtain channel 32 is as uniform as possible.

Working process:

The gas enters the air flow channel 3 from the two air blowing ports 21 respectively. Due to the presence of the partition plate 4, the air flow is divided into two parts, one part enters the first air flow channel 31, and the other part enters the second air flow channel 32;

The gas entering the first air flow channel 31 is finally ejected from the six rotating air curtain nozzles 12, because the six rotating air curtain nozzles 12 are arranged around the lower end of the side wall of the trumpet-shaped inner shell 1, and the opening directions of the six rotating air curtain nozzles 12 are arranged tangentially with respect to the generatrix of the side wall of the inner shell 1, and the rotating air curtain nozzles 12 are also provided with baffles, and the gas is ejected from the gap formed by the baffles and the side wall of the inner shell 1, forming a rotating airflow at the lower end of the air intake channel 11; at this time, if the upper end air intake port of the air intake channel 11 starts to draw air, the airflow in the air intake channel 11 will flow upward in a spiral, and the rotational energy of the spiral airflow will be transmitted downward, so that the air intake flow field outside the lower end air intake port of the air intake channel 11 forms a weaker spiral airflow, thereby effectively improving the suction effect and preventing the smoke and pollutants being sucked from escaping;

The gas entering the second air flow channel 32 is guided and stabilized by the air flow dividing plate 22, flows in the direction away from the central axis of the inner shell 1, and is ejected from the isolation air curtain nozzle 33 to form an isolation air curtain; because there are multiple air flow dividing plates 22, which are arranged radially, the diameter of the isolation air curtain is larger than the circumferential diameter of the lower end of the inner shell 1; the isolation air curtain can prevent the external air flow from interfering with the air flow in the isolation air curtain, and at the same time prevent the clean air outside the isolation air curtain from entering the isolation air curtain, and prevent the escape of the sucked gas and pollutants in the isolation air curtain.

The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (9)

1. An air intake and exhaust device, characterized in that it comprises an inner shell (1) and an outer shell (2); the outer shell (2) is sleeved outside the inner shell (1), an air flow channel (3) is formed between the outer shell (2) and the inner shell (1), and the outer shell (2) is provided with an air blowing port (21) connected to the air flow channel (3); An isolation air curtain nozzle (33) connected to the air flow channel (3) is provided between the outer shell (2) and the inner shell (1); air enters the air flow channel (3) from the air blowing port (21) and is ejected from the isolation air curtain nozzle (33) to form an isolation air curtain; The inner shell (1) has an air intake cavity (11) for allowing smoke to pass through, and the side wall of the inner shell (1) is also provided with a rotating air curtain nozzle (12) which is in communication with the air flow channel (3) and can form a rotating air curtain with the gas entering the air flow channel (3) from the air blowing port (21); The air intake and exhaust device further comprises a partition (4); the partition (4) is arranged in the air flow channel (3), and the partition (4) divides the air flow channel (3) into a first air flow channel (31) and a second air flow channel (32), the first air flow channel (31) being connected to the rotating air curtain nozzle (12), and the second air flow channel (32) being connected to the isolation air curtain nozzle (33). 2. The air intake and exhaust device according to claim 1, characterized in that the upper end of the partition (4) is lower than the air outlet (21). 3. The air intake and exhaust device according to claim 1 is characterized in that the inner wall of the outer shell (2) is provided with at least two air flow dividing plates (22) for guiding the flow, and the air flow dividing plates (22) are arranged in the isolation air curtain nozzle (33) at intervals and in a radial arrangement. 4. The air intake and exhaust device according to claim 3, characterized in that the spacing distance between two adjacent air flow dividing plates (22) is 8-20 mm, and the axial length of the air flow dividing plate (22) is greater than 20 mm. 5. The air intake and exhaust device according to claim 1, characterized in that the inner shell (1) is trumpet-shaped, and the cross-sectional area of one end of the inner shell (1) close to the isolation air curtain nozzle (33) is larger than the cross-sectional area of one end of the inner shell (1) away from the isolation air curtain nozzle (33). 6. The air intake and exhaust device according to claim 5, characterized in that the angle θ between the generatrix of the lower part of the side wall of the inner shell (1) and the central axis of the inner shell (1) is 20° to 70°. 7. The air intake and exhaust device according to claim 1, characterized in that the air flow channel (3) is trumpet-shaped, and the cross-sectional area of the end close to the isolation air curtain nozzle (33) is larger than the cross-sectional area of the end away from the isolation air curtain nozzle (33). 8. The air intake and exhaust device according to any one of claims 5 to 7, characterized in that the opening direction of the rotating air curtain nozzle (12) is arranged tangentially with respect to the generatrix of the side wall of the inner shell (1). 9. The air intake and exhaust device according to any one of claims 1 to 7, characterized in that the number of the rotating air curtain nozzles (12) is at least three, and the rotating air curtain nozzles (12) are arranged around the air flow channel (3).