Range hood

Abstract

A range hood comprises: a box body, the front side wall or the bottom wall of which is provided with a smoke inlet, and the top wall of which is provided with a smoke outlet; the fan system is arranged in the box body and is used for driving oil smoke airflow to enter the box body from the smoke inlet and output from the smoke outlet; the air outlet barrel is vertically arranged above the box body, an air outlet channel extending up and down is defined by the side peripheral wall of the air outlet barrel, an opening in the lower end of the air outlet channel is an air inlet and is opposite to and communicated with the smoke outlet of the box body, and an opening in the upper end of the air outlet channel is an air outlet. The flow area of the cross section of the contraction section is gradually reduced, the flow area of the cross section of the expansion section is gradually increased, the contraction section and the expansion section are connected through the connection section, and an air suction hole penetrating through the wall thickness is formed in the side wall of the connection section. Therefore, external air can enter the connection section through the air suction hole under the action of air flow in the connection section. Compared with the prior art, the kitchen air can be further purified.

Description

Technical Field

[0001] The utility model belongs to the technical field of kitchen appliances, and in particular relates to a range hood. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It uses the negative pressure generated by the internal fan system to suck the fumes generated by cooking into the housing of the range hood, separate and purify the fumes in the housing, and then discharge them from the smoke outlet on the top of the housing. For example, the structures disclosed in the Chinese utility model patent "Ranger hood" with patent number 202322101902.1 (authorization announcement number CN220355500U) and the Chinese utility model patent "Side-suction range hood" with patent number 202222837318.8 (authorization announcement number CN218864276U).

[0003] When the existing range hood is working, smoke may escape due to insufficient suction, wind flow in the kitchen and other reasons. The smoke that is not sucked into the range hood spreads in the kitchen and pollutes the kitchen air. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a range hood which can further purify the kitchen air in view of the current status of the prior art.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a range hood, comprising:

[0006] The box body is hollow inside, and its front side wall or bottom wall is provided with a smoke inlet, and its top wall is provided with a smoke outlet;

[0007] A fan system is arranged in the box body, and is used to drive the oil smoke flow into the box body through the smoke inlet and out through the smoke outlet;

[0008] It is characterized by also including:

[0009] An air outlet cylinder is vertically arranged above the box body, and its side walls define an air outlet channel extending up and down. The lower end opening of the air outlet channel is an air inlet, and is opposite to and connected with the smoke outlet of the box body. The upper end opening of the air outlet channel is an air outlet. Along the flow direction of the airflow from bottom to top, the air outlet channel has a contraction section with a gradually decreasing flow area on the cross section, an expansion section located downstream of the contraction section and with a gradually increasing flow area on the cross section, and a connecting section connecting the contraction section and the expansion section. The side walls of the connecting section are provided with air intake holes that penetrate the wall thickness, so that outside air can enter the connecting section through the air intake holes under the action of the airflow in the connecting section.

[0010] In this way, when the oil smoke in the box is discharged upward through the air outlet pipe, it will undergo accelerated pressure reduction movement in the contraction section, high-speed movement in the connection section, and decelerated pressure increase movement in the expansion section. The oil smoke airflow that is first accelerated and then decelerated has little effect on the normal function of the range hood to absorb oil smoke from the smoke inlet and the overall static pressure of the smoke duct behind. Low pressure will be generated near the high-speed airflow in the connection section, so that the air outside the air outlet can be sucked into the connection section through the suction hole and discharged from the air outlet together with the high-speed airflow in the connection section. Therefore, the utility model can absorb the air around the air outlet pipe and purify the kitchen air.

[0011] In order to further reduce the impact on the normal function of the range hood, the length of the contraction section of the air outlet channel in the up and down directions is consistent with the length of the expansion section.

[0012] Furthermore, the inner diameter of the upper end of the contraction section of the air outlet channel is consistent with the inner diameter of the lower end of the expansion section; the inner diameter of the lower end of the contraction section of the air outlet channel is consistent with the inner diameter of the upper end of the expansion section.

[0013] Furthermore, along the flow direction of the airflow from bottom to top, the flow area on the cross section of the connecting section remains unchanged.

[0014] Therefore, the overall speed and static pressure of the oil fume airflow remain unchanged after passing through the contraction section, the connection section and the expansion section, so the oil fume absorption effect is not affected.

[0015] Furthermore, along the flow direction of the airflow from bottom to top, the air outlet channel also has a smoke inlet section located upstream of the contraction section and having a constant flow area on the cross section, the lower end of the smoke inlet section is the air inlet of the air outlet channel, the upper end of the smoke inlet section is connected to the lower end of the contraction section, and the inner diameters of the two are consistent. That is, the oil smoke airflow output from the smoke outlet of the box first moves at a uniform speed in the smoke inlet section, and then flows to the contraction section, the connection section and the expansion section downstream.

[0016] Furthermore, along the flow direction of the airflow from bottom to top, the air outlet channel also has a smoke exhaust section located downstream of the expansion section and having a constant flow area on the cross section, the upper end of the smoke exhaust section is the air outlet of the air outlet channel, the lower end of the smoke exhaust section is connected to the upper end of the expansion section, and the inner diameters of the two are consistent. That is, the oil smoke airflow moves at a uniform speed in the smoke exhaust section, which is conducive to the subsequent delivery to the downstream smoke exhaust pipe, and the design of the smoke exhaust section is conducive to the connection with the downstream smoke exhaust pipe.

[0017] In the above schemes, the air intake hole can be always in an open state, or can be opened selectively. Preferably, a cover is provided at the air intake hole, and a driving member for driving the cover to move to open or close the air intake hole, and a controller connected to the driving member are provided. The outer end surface of the cover facing the outside is provided with a sensor for detecting harmful gas or smoke, and the sensor is connected to the controller. Thus, the utility model can control the opening and closing of the air intake hole according to the data detected by the sensor. For example, when the sensor detects that there are more harmful gases or smoke around, the controller controls the driving member to work to open the air intake hole; on the contrary, when the sensor detects that there are less harmful gases or smoke around, or even no harmful gases or smoke, the controller controls the driving member to work to close the air intake hole. At this time, the range hood only absorbs oil smoke through the smoke inlet.

[0018] Preferably, there are at least two air intake holes, which are spaced apart along the circumference. More preferably, the air intake holes are equally spaced apart along the circumference.

[0019] Further, the air intake holes are located at the same height or the air intake holes are located at different heights.

[0020] Furthermore, the ratio of the flow area of ​​a single air intake hole to the flow area of ​​the connecting section on the cross section is 0.05-0.1; the ratio of the sum of the flow areas of the air intake holes to the flow area of ​​the connecting section on the cross section is 0.2-0.4. Thus, the setting of the air intake holes does not affect the flow of the oil smoke airflow in the air outlet.

[0021] Compared with the prior art, the advantage of the utility model lies in that an air outlet pipe with a contraction section, a connection section and an expansion section is arranged above the box body, and when the oil smoke in the box body is discharged upward through the air outlet pipe, it will undergo the accelerated pressure reduction movement of the contraction section, the high-speed movement of the connection section, and the deceleration and pressurization movement of the expansion section. The oil smoke airflow that first accelerates and then decelerates has little effect on the normal function of the range hood to absorb oil smoke from the smoke inlet and the overall static pressure of the rear smoke duct, and low pressure is generated near the high-speed airflow in the connection section, so that the air outside the air outlet can be sucked into the connection section through the suction hole and discharged from the air outlet together with the high-speed airflow in the connection section. Therefore, the utility model can absorb the air around the air outlet pipe and purify the kitchen air. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial structural schematic diagram of an embodiment of the utility model;

[0023] Figure 2 It is a cross-sectional view of a part of the structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] like Figure 1 , 2 As shown, a preferred embodiment of a range hood of the utility model is shown, and the range hood comprises a housing 1, a fan system and an air outlet 2.

[0026] The box body 1 is hollow inside, a smoke inlet 11 is provided on the front side wall, and a smoke outlet 12 is provided on the top wall.

[0027] The above-mentioned fan system is a prior art, which is arranged in the box body 1 and is used to drive the oil smoke airflow generated by cooking to enter the box body 1 through the smoke inlet 11 and be discharged through the smoke outlet 12.

[0028] The air outlet 2 is vertically arranged above the box body 1, and its side wall defines an air outlet channel 20 extending up and down. The lower end of the air outlet channel 20 is open as an air inlet 2a, which is opposite to and connected with the smoke outlet 12 of the box body 1, and the upper end of the air outlet channel 20 is open as an air outlet 2b. The air outlet channel 20 has a smoke inlet section 24, a contraction section 21, a connection section 22, an expansion section 23 and a smoke exhaust section 25 arranged from bottom to top. Among them, the lower end of the smoke inlet section 24 is the air inlet 2a of the air outlet channel 20, and the upper end of the smoke exhaust section 25 is the air outlet 2b of the air outlet channel 20. In addition, along the flow direction of the airflow from bottom to top, the flow area on the cross section of the smoke inlet section 24 remains unchanged, the flow area on the cross section of the contraction section 21 gradually decreases, the flow area on the cross section of the connection section 22 remains unchanged, the flow area on the cross section of the expansion section 23 gradually increases, and the flow area on the cross section of the smoke exhaust section 25 remains unchanged. At the same time, the length of the contraction section 21 in the up and down directions is consistent with the length of the expansion section 23, and the inner diameter of the upper end of the contraction section 21 is consistent with the inner diameter of the lower end of the expansion section 23, and the two are connected by the connecting section 22; the inner diameter of the lower end of the contraction section 21 is consistent with the inner diameter of the upper end of the expansion section 23, and the lower end of the contraction section 21 is connected with the upper end of the smoke inlet section 24, and the inner diameters of the two are consistent, and the upper end of the expansion section 23 is connected with the lower end of the smoke exhaust section 25, and the inner diameters of the two are consistent.

[0029] In this way, when the oil smoke in the box body 1 is discharged upward through the air outlet 2, it will successively go through the uniform speed movement of the smoke inlet section 24, the accelerated pressure reduction movement of the contraction section 21, the high speed movement of the connection section 22, the decelerated pressure increase movement of the expansion section 23, and the uniform speed movement of the smoke exhaust section 25, and then be output from the air outlet 2b of the air outlet 2. The air outlet 2b of the air outlet can be connected to the existing smoke exhaust pipe, and the diameter of the air outlet 2b is designed according to the diameter of the smoke exhaust pipe so that the air outlet 2b can be connected to the pipe mouth of the smoke exhaust pipe.

[0030] At the same time, the side wall of the connecting section 22 is provided with an air intake hole 220 that penetrates the wall thickness. There are four air intake holes 220, which are arranged at equal intervals along the circumference, and the heights of the air intake holes 220 are consistent. The ratio of the flow area of ​​a single air intake hole 220 to the flow area of ​​the connecting section on the cross section is 0.05-0.1 (the ratio is any value between 0.05 and 0.1, such as 0.05, 0.08, 0.1, etc.). A cover 3 is provided at each air intake hole 220, and a driving member for driving the cover 3 to move to open or close the air intake hole 220, and a controller connected to the driving member are provided. The outer end surface 31 of the cover 3 facing the outside is provided with a sensor (an existing sensor) for detecting harmful gases or smoke, and the sensor is connected to the controller. In this embodiment, the cover 3 can be rotatably connected to the air intake hole 220, and can also be arranged at the air intake hole 220 to move inside and outside to open and close the air intake hole 220. When the cover is rotatably connected to the air intake hole 220, the driving member may be a motor that drives the cover to rotate; when the cover is arranged in a manner that it can move inward and outward, the driving member may be a telescopic member that drives the cover to move. When the range hood is working, when the sensor detects that there are more harmful gases or smoke around, the controller controls the driving member to work to open the air intake hole 220. At this time, the air in the kitchen can enter the connecting section 22 from the air intake hole 220 under the action of the high-speed airflow in the connecting section 22; on the contrary, when the sensor detects that there are less harmful gases or smoke around, or even no harmful gases or smoke, the controller controls the driving member to work to close the air intake hole 220. At this time, the range hood only performs oil fume extraction through the smoke inlet 11.

[0031] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "upper", "lower", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0032] The term "vertical" is also used in the specification and claims of the present utility model, which means basically along the up and down direction, and is not limited to the vertical direction only, and can also be slightly inclined relative to the vertical direction.

Claims

1. A range hood, comprising: A box body (1) having a hollow interior, a front side wall or a bottom wall of which is provided with a smoke inlet (11), and a top wall of which is provided with a smoke outlet (12); A fan system is arranged in the box (1) and is used to drive the oil smoke flow into the box (1) through the smoke inlet (11) and out through the smoke outlet (12); Features Also included are: An air outlet duct (2) is vertically arranged above the box body (1), and its side peripheral wall defines an air outlet channel (20) extending up and down. The lower end of the air outlet channel (20) is open to form an air inlet (2a) and is opposite to and connected to the smoke outlet (12) of the box body (1). The upper end of the air outlet channel (20) is open to form an air outlet (2b). Along the flow direction of the airflow from bottom to top, the air outlet channel (20) has a contraction section (21) with a gradually decreasing flow area in a cross section, an expansion section (23) located downstream of the contraction section (21) and with a gradually increasing flow area in a cross section, and a connecting section (22) connecting the contraction section (21) and the expansion section (23). The side wall of the connecting section (22) is provided with an air intake hole (220) penetrating the wall thickness, so that outside air can enter the connecting section (22) through the air intake hole (220) under the action of the airflow in the connecting section (22).

2. The range hood according to claim 1, characterized in that: The length of the contraction section (21) of the air outlet channel (20) in the up-down direction is consistent with the length of the expansion section (23).

3. The range hood according to claim 2, characterized in that: The inner diameter of the upper end of the contraction section (21) of the air outlet channel (20) is consistent with the inner diameter of the lower end of the expansion section (23); the inner diameter of the lower end of the contraction section (21) of the air outlet channel (20) is consistent with the inner diameter of the upper end of the expansion section (23).

4. The range hood according to claim 3, characterized in that: Along the flow direction of the airflow from bottom to top, the flow area on the cross section of the connecting section (22) remains unchanged.

5. The range hood according to claim 1, characterized in that: Along the flow direction of the airflow from bottom to top, the air outlet channel (20) further comprises a smoke inlet section (24) located upstream of the contraction section (21) and having a constant flow area in the cross section; the lower end of the smoke inlet section (24) is the air inlet (2a) of the air outlet channel (20); the upper end of the smoke inlet section (24) is connected to the lower end of the contraction section (21), and the inner diameters of the two are the same.

6. The range hood according to claim 5, characterized in that: Along the flow direction of the airflow from bottom to top, the air outlet channel (20) further comprises a smoke exhaust section (25) located downstream of the expansion section (23) and having a constant flow area in the cross section, the upper end of the smoke exhaust section (25) being the air outlet (2b) of the air outlet channel (20), the lower end of the smoke exhaust section (25) being connected to the upper end of the expansion section (23), and the inner diameters of the two are the same.

7. The range hood according to any one of claims 1 to 6, characterized in that: The air intake hole (220) is provided with a cover (3), a driving member for driving the cover (3) to move and open or close the air intake hole (220), and a controller connected to the driving member. The outer end surface (31) of the cover (3) facing the outside is provided with a sensor for detecting harmful gas or smoke, and the sensor is connected to the controller.

8. The range hood according to any one of claims 1 to 6, characterized in that: There are at least two air suction holes (220), which are arranged at equal intervals along the circumferential direction.

9. The range hood according to claim 8, characterized in that: The air intake holes (220) are located at the same height or the air intake holes (220) are located at different heights.

10. The range hood according to claim 8, characterized in that: The ratio of the flow area of ​​a single air intake hole (220) to the flow area of ​​the connecting section on the cross section is 0.05-0.1; the ratio of the sum of the flow areas of the air intake holes (220) to the flow area of ​​the connecting section on the cross section is 0.2-0.4.

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