Range hood capable of improving oil smoke suction effect

Abstract

The range hood comprises a box body and an air suction panel, an induced air return structure communicated with the box body is arranged on the edge of the upper side of the air suction panel, an induced air return opening is formed in the induced air return structure, and a fan-shaped induced airflow area is formed in front of the induced air return opening. The leaked oil fume flows upwards along the air suction panel, according to the wall attachment effect, the speed of the leaked oil fume reaching the edge of the upper side of the air suction panel is very low, and according to the Bernoulli effect, after the leaked oil fume at the edge of the upper side of the air suction panel meets airflow entering the lower portion of the induced air return structure from the induced airflow area, the leaked oil fume enters the induced air return structure. And the mixed airflow leaves the upper side edge of the air suction panel, enters the air suction area of the range hood and finally enters the air suction opening of the air suction panel, so that oil smoke leakage can be effectively reduced. The power needed by the induction fan is small, the power of the main fan in the box body can be further reduced, and the effects of saving energy, reducing carbon, saving electricity and reducing noise can be achieved.

Description

Technical Field

[0001] The invention relates to kitchen ventilation and smoke exhaust equipment, in particular to a range hood. Background Art

[0002] The air intake of the range hood in the prior art is arranged in the middle or upper middle position of the air intake panel, and the air intake is at a certain distance from the upper edge of the air intake panel. In particular, in the range hood with an inclined air intake panel as disclosed in CN212615441U or a "7"-shaped air intake panel as disclosed in CN220453747U, the oil smoke that is not sucked in in time will leak from the upper edge of the air intake panel, resulting in an unsatisfactory oil smoke suction effect. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a range hood which can reduce air leakage and improve the oil fume extraction effect.

[0004] The technical solution adopted by the present invention to solve its technical problem is: A range hood for improving the oil fume extraction effect comprises a housing and an air suction panel located on the housing, the air suction panel being provided with an air suction port, the upper edge of the air suction panel being provided with an induced return air structure connected with the housing, the induced return air structure comprising an induced return air port and an induced fan, an air duct pipe being installed in the induced return air port, the air duct pipe being provided with an induced air outlet inclined toward the inner side of the induced return air port; the housing is provided with an induced air inlet connected with the air inlet side of the induced fan, the air outlet side of the induced fan is connected with the air duct pipe, the air sucked from the induced air inlet is blown out from the induced air outlet, forming a fan-shaped induced airflow area in front of the induced return air port.

[0005] As a further improvement of the present invention, the air duct pipe is provided with two mirror-arranged ones, and the induced air outlet is located on a side close to the induced return air outlet.

[0006] As a further improvement of the present invention, the side of the air duct pipe away from the induced air outlet has an air guide surface, and a trumpet-shaped return air duct that gradually expands along the return air direction is formed between the air guide surfaces of the two air duct pipes.

[0007] As a further improvement of the present invention, the wind guide surfaces are respectively the first guide surface, the second guide surface, the third guide surface and the fourth guide surface along the direction of the blown air flow, the first guide surface is an arcuate surface, and the second guide surface, the third guide surface and the fourth guide surface are all planes.

[0008] As a further improvement of the present invention, the angle between the fourth guide surface and the horizontal direction is greater than the angle between the second guide surface and the horizontal direction, and the angle between the second guide surface and the horizontal direction is greater than the angle between the third guide surface and the horizontal direction; the width of the second guide surface is greater than the width of the fourth guide surface, and the width of the fourth guide surface is greater than the width of the third guide surface.

[0009] As a further improvement of the present invention, the induced air inlet is located at the top or both sides of the box body, and an air filter is installed at the induced air inlet.

[0010] As a further improvement of the present invention, the induced return air outlet runs through the entire upper side of the air intake panel, and the induced return air outlet can be directed toward the front, below, above, obliquely below or above the box body.

[0011] The beneficial effect of the present invention is as follows: the present invention is provided with an induced return air structure connected to the box body at the upper edge of the air suction panel, and a fan-shaped induced airflow area is formed in front of the induced return air port, most of the airflow in the induced airflow area is sucked into the induced return air port, a small part of the airflow flows into the upper part of the induced return air structure, and the other part of the airflow flows into the lower part of the induced return air structure, and the leaked oil smoke flows upward along the air suction panel. According to the wall attachment effect, the speed of the leaked oil smoke when reaching the upper edge of the air suction panel is very small, and its direction is opposite to the airflow direction of the induced airflow area, and the negative pressure of the air suction area of ​​the range hood is much greater than the negative pressure of the induced airflow area. According to the Bernoulli effect, after the leaked oil smoke at the upper edge of the air suction panel meets the airflow entering the lower part of the induced return air structure in the induced airflow area, the mixed airflow will leave the upper edge of the air suction panel and turn to enter the air suction area of ​​the range hood, and finally enter the air suction port of the air suction panel, which can effectively reduce the leakage of oil smoke. The power required by the induced fan of the present invention is small, which can further reduce the power of the main fan in the box, and can achieve the effects of energy saving, carbon reduction, electricity saving and noise reduction.

[0012] In addition, the induced return air structure includes two parallel and symmetrically arranged air duct pipes, each of which has an induced air outlet and an air guide surface. A trumpet-shaped return air duct that gradually expands along the return air direction is formed between the air guide surfaces of the two air duct pipes. The airflow blown out from the induced air outlet is inclined toward the air guide surface. This structure makes the airflow channel at the outlet end of the return air duct reach more than 15 times the airflow channel at the inlet end, which can accelerate the air flow rate at the inlet end of the airflow. The induced return air structure only needs a very small power, namely, an induced fan, to achieve the return air effect, and can further achieve the effects of energy saving, carbon reduction, electricity saving, and noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1It is a structural schematic diagram of an embodiment; Figure 2 It is a structural schematic diagram of the induced return air structure; Figure 3 It is a structural diagram of the air duct; Figure 4 This is a schematic diagram of the structure of the first implementation method of the induced return air outlet; Figure 5 It is a schematic structural diagram of a second implementation method of the induced return air outlet; Figure 6 It is a schematic structural diagram of a third implementation method of the induced return air outlet; Figure 7 It is a schematic structural diagram of a fourth implementation method of the induced return air outlet; Figure 8 It is a schematic structural diagram of a fifth implementation method of the induced return air outlet; Fig. 9 It is a schematic diagram of the airflow in the induced return air structure; Fig.10 It is a schematic structural diagram of a first implementation method of an induced return air structure; Fig.11 It is a structural schematic diagram of a second implementation method of the induced return air structure; Fig.12 It is a schematic structural diagram of a third implementation method of the induced return air structure; Fig.13 It is a schematic structural diagram of a fourth implementation method of the induced return air structure; Fig.14 It is a schematic diagram of air flow when the range hood is working. DETAILED DESCRIPTION

[0015] Reference Figures 1 to 14 A range hood for improving the oil fume suction effect comprises a housing 1 and an air suction panel 2 located on the housing 1, wherein the air suction panel 2 is provided with an air suction port 3. A main fan is provided in the housing 1, and the air suction panel 2 is provided on the front of the housing 1, and may be an inclined air suction panel disclosed in CN212615441U, such as a "7"-shaped air suction panel disclosed in CN220453747U, or may be provided at the bottom of the housing 1, such as a flat air suction panel disclosed in CN207438688U.

[0016] The range hoods in general households are installed against the wall. The rear side of the suction panel 2 is the side close to the installation wall, the front side of the suction panel 2 refers to the side close to the user, and the two sides of the suction panel 2 refer to the parts located between the rear side and the front side. The oil fume leakage of the range hood mainly occurs on the upper side (front side) of the suction panel 2, especially the range hood with a slanted suction panel or a "7"-shaped suction panel. At this time, it is only necessary to solve the oil fume leakage problem on the upper side (front side) of the range hood.

[0017] In order to solve the problem of oil smoke leakage on the upper side (front side) of the range hood, the present invention is provided with an induced return air structure 4 connected to the box body 1 on the upper edge of the air suction panel 2, the induced return air structure 4 includes an induced return air port 41 and an induced fan 42, an air duct pipe 5 is installed in the induced return air port 41, and the air duct pipe 5 is provided with an induced air outlet 51 inclined toward the inner side of the induced return air port 41; the box body 1 is provided with an induced air inlet 53 connected to the air inlet side of the induced fan 42, the air outlet side of the induced fan 42 is connected to the air duct pipe 5, the air sucked from the induced air inlet 53 is blown out from the induced air outlet 51, and a fan-shaped induced airflow area B is formed in front of the induced return air port 41. The power of the main fan is much greater than that of the induced fan 42, and the negative pressure in the suction area A of the range hood is also much greater than the negative pressure in the induced airflow area B. The induced airflow area B sucks air inward, and the power required is very small compared to the isolation air curtain that blows air outward. Moreover, the phenomenon of leaked oil smoke being blown away by the isolation air curtain is avoided.

[0018] Reference Fig.14 Most of the airflow in the induced airflow area B of the present invention is sucked into the induced return air port 41, a small part of the airflow flows into the top of the induced return air structure 4, and the other part of the airflow flows into the bottom of the induced return air structure 4. The leaked oil smoke flows upward along the air suction panel 2. According to the wall attachment effect, the speed of the leaked oil smoke when it reaches the upper edge of the air suction panel 2 is very small, and its direction is opposite to the airflow direction of the induced airflow area B. The negative pressure of the suction area A of the range hood is much greater than the negative pressure of the induced airflow area B. According to the Bernoulli effect, after the leaked oil smoke at the upper edge of the air suction panel 2 meets the airflow from the induced airflow area B entering the bottom of the induced return air structure 4, the mixed airflow will leave the upper edge of the air suction panel 2 and turn to enter the suction area A of the range hood, and finally enter the air suction port 3 of the air suction panel 2, which can effectively reduce the leakage of oil smoke. The power required by the induced fan 42 of the present invention is relatively small, which can further reduce the power of the main fan in the box 1, and can achieve the effects of energy saving, carbon reduction, electricity saving, and noise reduction.

[0019] The air duct pipe 5 can be one or two, and the cross-section of the air duct pipe 5 can be rectangular, triangular or any other shape. The position of the induced air outlet 51 of the air duct pipe 5 can be located at the front side, rear side or middle part of the air duct pipe 5. The air outlet direction of the induced air outlet 51 can be blown out horizontally inward, or can be blown out obliquely upward or obliquely downward. The return air duct formed between the two air duct pipes 5 can be parallel rectangular, or can be a gradually shrinking cone or any other shape. In this embodiment, it is best that the air duct pipe 5 is provided with two mirror-arranged ones, and the induced air outlet 51 is located on the side close to the induced return air outlet 41. Specifically, refer to Figure 2 and Figure 3 The air duct 5 has an air guide surface 52 on one side away from the induced air outlet 51, and a trumpet-shaped return air duct gradually expanding along the return air direction is formed between the air guide surfaces 52 of the two air duct pipes 5. Moreover, the air guide surface 52 is a first guide surface 54, a second guide surface 55, a third guide surface 56 and a fourth guide surface 57 in sequence along the blown air flow direction. The first guide surface 54 is an arc surface, and the second guide surface 55, the third guide surface 56 and the fourth guide surface 57 are all planes (horizontally or inclinedly arranged plane surfaces). The angle a1 between the fourth guide surface 57 and the horizontal direction is greater than the angle a2 between the second guide surface 55 and the horizontal direction, and the angle a2 between the second guide surface 55 and the horizontal direction is greater than the angle a3 between the third guide surface 56 and the horizontal direction; the width h1 of the second guide surface 55 is greater than the width h2 of the fourth guide surface 57, and the width h2 of the fourth guide surface 57 is greater than the width h3 of the third guide surface 56.

[0020] The airflow in the induced return air structure 4 is as follows Fig. 9 As shown, the airflow blown out from the induced air outlet 41 flows along the first guide surface 54, the second guide surface 55, the third guide surface 56 and the fourth guide surface 57. When the airflow leaves the fourth guide surface 57, a vortex of turbulent airflow is generated. Coupled with the trumpet-shaped return air duct design, the airflow channel at the outlet end of the return air duct is more than 15 times the airflow channel at the inlet end. Under the strong suction force of the main fan, according to the Bernoulli effect, the faster the wind speed, the lower the pressure, which can accelerate the air flow rate at the inlet end of the return air duct. The induced return air structure only needs a small power, namely the induced fan 42, to achieve the return air effect, and can further achieve the effects of energy saving, carbon reduction, electricity saving and noise reduction.

[0021] In this embodiment, the induced air inlet 53 is located at the top or both sides of the box body 1. Preferably, the induced air inlet 53 is located at the top of the box body 1. The induced fan 42 can be one, such as Fig.10 As shown, it is vertically installed at one end of the air duct 5 (installed in the box 1), as shown in FIG. Fig.12As described above, it is horizontally installed on the box 1 at one end of the air duct 5 (installed outside the box 1), and two can also be set, such as Fig.11 As shown, they are respectively installed vertically at both ends of the air duct 5, and can also be Fig.13 As shown, they are horizontally installed on the box body 1 at both ends of the air duct pipe 5 (installed outside the box body 1), and an air filter 43 is installed at the induced air inlet 53. The air filter 43 can be replaced after being used for a period of time.

[0022] As a further improvement of the present invention, the induced return air vent 41 runs through the upper side of the entire air suction panel 2, and the induced return air vent 41 can be oriented toward Figure 4 The front of the box 1 shown in FIG. Figure 5 Directly below the box body 1 shown, it can be directed toward Figure 6 The top of the box body 1 shown in FIG. Figure 7 The lower part of the box body 1 shown in the figure can also be directed toward Figure 8 The oblique upper side of the box body 1 is shown.

[0023] In this embodiment, the lower end of the induced return air structure 4 protrudes downward and is lower than the surface of the air suction panel 2. The angle a4 formed by the outer wall of the induced return air structure 4 and the surface of the top of the air suction panel 2 is preferably a right angle or an acute angle, so that the oil fume purification effect is more ideal.

[0024] The above implementation modes cannot limit the protection scope of the present invention. The equivalent modifications and changes made by those skilled in the art without departing from the overall concept of the present invention are still within the scope of the present invention.

Claims

1. A range hood for improving the fume extraction effect, comprising a housing and an air suction panel located on the housing, wherein the air suction panel is provided with an air suction port, characterized in that An induced return air structure connected to the box body is provided at the upper edge of the air suction panel, and the induced return air structure includes an induced return air port and an induced air fan. An air duct pipe is installed in the induced return air port, and the air duct pipe is provided with an induced air outlet inclined toward the inner side of the induced return air port; the box body is provided with an induced air inlet connected to the air inlet side of the induced air fan, and the air outlet side of the induced air fan is connected to the air duct pipe, and the air sucked in from the induced air inlet is blown out from the induced air outlet, forming a fan-shaped induced airflow area in front of the induced return air port.

2. The range hood for improving the oil fume extraction effect according to claim 1, characterized in that The air duct pipe is provided with two mirror-arranged ones, and the induced air outlet is located on a side close to the induced air return outlet.

3. The range hood for improving the oil fume absorption effect according to claim 2, characterized in that The air duct pipe has an air guiding surface on one side away from the induced air outlet, and a trumpet-shaped return air duct gradually expanding along the return air direction is formed between the air guiding surfaces of the two air duct pipes.

4. The range hood for improving the oil fume extraction effect according to claim 3, characterized in that The wind guide surfaces are respectively a first guide surface, a second guide surface, a third guide surface and a fourth guide surface along the direction of the blown air flow. The first guide surface is an arcuate surface, and the second guide surface, the third guide surface and the fourth guide surface are all plane surfaces.

5. The range hood for improving the oil fume extraction effect according to claim 4, characterized in that The included angle between the fourth guide surface and the horizontal direction is greater than the included angle between the second guide surface and the horizontal direction, and the included angle between the second guide surface and the horizontal direction is greater than the included angle between the third guide surface and the horizontal direction.

6. The range hood for improving the oil fume extraction effect according to claim 5, characterized in that The width of the second guide surface is greater than that of the fourth guide surface, and the width of the fourth guide surface is greater than that of the third guide surface.

7. The range hood for improving the oil fume absorbing effect according to claim 1, characterized in that The induced air inlets are located at the top or both sides of the box body.

8. The range hood for improving the oil fume extraction effect according to claim 7, characterized in that An air filter is installed at the induced air inlet.

9. The range hood for improving the oil fume absorbing effect according to claim 1, characterized in that The induced return air port runs through the entire upper side of the air suction panel.

10. The range hood for improving the oil fume absorbing effect according to claim 1, characterized in that The induced return air outlet faces directly in front of, directly below, directly above, obliquely below or obliquely above the box body.

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