Range hood

Abstract

The range hood comprises a machine body, a main air duct and a secondary air duct located outside the main air duct are formed in the machine body, the machine body is provided with a smoke inlet face, an air inlet part for smoke to pass through is arranged on the smoke inlet face, and the air inlet part comprises a main air inlet and at least one secondary air inlet; the main air inlet is communicated with the main air duct, the secondary air inlet is arranged outside the left side or the right side of the main air inlet and is communicated with the secondary air duct, the ratio of the air inlet area of the main air inlet to the air inlet area of the secondary air inlet is gamma, and gamma belongs to [2, 10]. According to the range hood disclosed by the utility model, the problem of poor smoke gathering effect caused by unreasonable negative pressure distribution of the air inlet in the actual use process of the range hood is solved.

Description

Technical Field

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

[0002] The range hood with a central air cabinet, that is, part of the air cabinet is located in the cabinet and the other part is located in the smoke hood, is one of the mainstream range hood forms. Since the impeller is located in the center of the unit, in actual use, the smoke source is generally located on both sides of the unit. The airflow path in the central air cabinet has a large turning angle, resulting in poor smoke collection effect. Summary of the invention

[0003] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a range hood to solve the problem of poor smoke collection effect caused by unreasonable negative pressure distribution at the air inlet during actual use of the range hood.

[0004] According to the range hood provided above, it is implemented through the following technical solutions:

[0005] A range hood comprises: a body, a main air duct and a secondary air duct located outside the main air duct are formed inside the body, the body has a smoke inlet surface, an air inlet portion for smoke to pass through is provided on the smoke inlet surface, the air inlet portion comprises a main air inlet and at least one secondary air inlet, the main air inlet is connected to the main air duct, the secondary air inlet is arranged outside the left or right side of the main air inlet and is connected to the secondary air duct, the ratio of the air inlet area of ​​the main air inlet to the air inlet area of ​​the secondary air inlet is γ, γ∈[2,10].

[0006] In some embodiments, the upper edge of the secondary air inlet is lower than the upper edge of the main air inlet; and / or the secondary air inlet is composed of a plurality of strip-shaped filter holes arranged at intervals.

[0007] In some embodiments, the machine body includes a box assembly, an outer shell assembly and an isolation baffle, the box assembly is installed on the top of the outer shell assembly and together form a cavity, the isolation baffle is arranged in the cavity and divides the cavity into a main air duct and a secondary air duct, and a vent for smoke to pass through and connected to the main air duct is provided on the isolation baffle, and the smoke inlet surface is arranged on the outer shell assembly.

[0008] In some embodiments, the isolation baffle includes a back panel and two side panels, the back panel is arranged in the outer shell assembly and located behind the main air inlet, and the vent is provided on the back panel; the two side panels are arranged on the left and right outer sides of the main air inlet, and the rear ends of the two side panels are respectively fixedly connected to the left and right ends of the back panel, and the front ends are respectively connected to or abut the smoke inlet surface.

[0009] In some embodiments, the lower end of the back panel extends downward to below the smoke inlet surface and is connected to or abuts against the front of the outer shell assembly; the upper end of the back panel and the upper ends of the two side panels extend upward into the box assembly and are respectively abutted or connected to the front of the box assembly.

[0010] In some embodiments, a lower guide portion is provided at the lower end of the back plate of the isolation baffle, and / or an upper guide portion is provided at the upper end of the back plate of the isolation baffle.

[0011] In some embodiments, a smoke collecting cavity opening forward is recessed on the front surface of the housing assembly, and a rear cavity wall surface of the smoke collecting cavity constitutes the smoke inlet surface.

[0012] In some embodiments, the housing assembly includes a smoke collecting hood and a smoke baffle, the smoke collecting hood is provided with a front opening on the front side, the smoke baffle is installed at the front opening, and a smoke collecting cavity opening forward is recessed on the smoke baffle.

[0013] In some embodiments, a wind cabinet component is further included, which is installed in the secondary air duct and has a front air suction port and a rear air suction port that are relatively arranged, the rear air suction port is connected to the secondary air duct, and the front air suction port is connected to the main air duct.

[0014] In some embodiments, the wind cabinet assembly includes a volute, a double-suction impeller and a driver, the volute having a front air intake and a rear air intake arranged relatively to each other, the double-suction impeller is rotatably disposed in the volute and includes a middle disk and a plurality of blades, all of the blades are circumferentially spaced at an outer edge of the middle disk, and the driver is provided with a rotating shaft extending toward the middle disk, and the rotating shaft is connected to the middle disk.

[0015] In some embodiments, the center disk divides each of the blades into a front air intake section and a rear air intake section, and the ratio of the length of the front air intake section to the length of the rear air intake section is α, α / γ∈[0.8,1.2].

[0016] In some embodiments, the lower end of the wind cabinet assembly is located behind the main air duct, and the upper edge of the secondary air inlet is lower than the rotation axis of the wind cabinet assembly.

[0017] In some embodiments, a flap assembly is further included, wherein the flap assembly is rotatably connected to the machine body and is used to open or close the air inlet.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. The range hood of the utility model makes the main air duct and the secondary air duct relatively independent, and designs the air inlet area ratio of the main and secondary air inlets, thereby reducing the turbulent state of the air flow inside the range hood during operation, reducing the "wind grabbing" phenomenon, and solving the problem of poor smoke collection effect caused by unreasonable negative pressure distribution at the air inlet during actual use of the range hood;

[0020] 2. By designing the upper edge of the secondary air inlet to be lower than the upper edge of the main air inlet, the negative pressure area of ​​the secondary air inlet is moved downward, the smoking effect is better, and the "wind grabbing" phenomenon between the main and secondary air inlets is reduced;

[0021] 3. By setting the wind cabinet component in the machine body, and its front air intake and rear air intake are respectively connected to the main air duct and the secondary air duct, and by designing the wheel position of the double-suction impeller in the wind cabinet component, the negative pressure distribution of the main air inlet and the secondary air inlet is made more reasonable, further improving the overall smoke collection effect of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the range hood in the embodiment of the utility model in an open state;

[0023] Figure 2 This is a schematic diagram of the structure of the range hood in the embodiment of the utility model in a closed state;

[0024] Figure 3 is a cross-sectional view of the range hood in the embodiment of the utility model in a closed state;

[0025] Figure 4 is an exploded view of the range hood in the embodiment of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the smoke shield in the embodiment of the utility model;

[0027] Figure 6 It is a structural schematic diagram of the isolation baffle in the embodiment of the utility model;

[0028] Figure 7 It is a cross-sectional view of a double-suction impeller in an embodiment of the utility model;

[0029] Figure 8 It is a schematic diagram of the air flow velocity distribution of the range hood.

[0030] In the figure: 1-machine body, 101-main air duct, 102-secondary air duct, 103-smoke inlet surface, 104-main air inlet, 105-strip filter hole, 11-box assembly, 12-housing assembly, 121-smoke hood, 1210-installation port, 1211-front opening, 122-smoke baffle, 1221-smoke chamber, 1222-flange, 13-isolation baffle, 131-vent, 132-side plate, 1321-vertical edge, 133-lower guide part; 2-wind cabinet assembly, 21-volute, 211-front air inlet, 212-rear air inlet, 22-double-suction impeller, 221-middle plate, 222-blades, 23-driver, 231-rotating shaft, 24-air guide ring; 3-flap assembly; 4-oil net assembly. DETAILED DESCRIPTION

[0031] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific implementation of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed for protection in the present invention.

[0032] refer to Figure 1-3 The present embodiment provides a range hood, comprising a body 1, wherein a main air duct 101 and a secondary air duct 102 independent of each other are formed inside the body 1, and the secondary air duct 102 is located outside the main air duct 101. In the present embodiment, the secondary air duct 102 embraces the main air duct 101, thereby reducing the disorder of the airflow inside the body during the operation of the range hood and reducing the "wind grabbing" phenomenon.

[0033] The body 1 has a smoke inlet surface 103, which is located in front of the main air duct 101 and the secondary air duct 102, and an air inlet portion (not shown in the figure) for smoke to pass through is provided on the smoke inlet surface 103. In this embodiment, the air inlet portion includes a main air inlet 104, which is arranged in the middle of the left and right directions of the smoke inlet surface 103 and is connected to the main air duct 101 to form a main air inlet channel. The air inlet portion also includes two secondary air inlets, which are respectively arranged at the left and right ends of the smoke inlet surface 103, and each secondary air inlet is connected to the secondary air duct 102 to form an auxiliary air inlet channel. Thus, through the cooperation of the main air inlet channel and the two auxiliary air inlet channels, the range hood can be three-chambered, increasing the unit smoke intake area, and the two auxiliary air inlet channels can capture the oil smoke escaping from the main air inlet 101 to the outside of the range hood, reducing the escape of oil smoke, and effectively improving the overall smoke collection effect of the range hood.

[0034] Furthermore, the ratio of the air inlet area of ​​the main air inlet 1041 to the air inlet area of ​​the secondary air inlet is γ, γ∈[2,10]. In this way, by designing the ratio of the air inlet areas of the main and secondary air inlets, the negative pressure distribution at the main air inlet 103 and the secondary air inlet is more reasonable, thereby solving the problem of poor smoke collection effect caused by unreasonable negative pressure distribution at the air inlet during actual use of the range hood.

[0035] Furthermore, the two secondary air inlets are respectively located on the left and right outer sides of the main air inlet 1041, and the upper edge of each secondary air inlet is lower than the upper edge of the main air inlet 104, so that the negative pressure area of ​​the secondary air inlet moves downward, the smoking effect is better, and the oil smoke escaping from the main air inlet 101 to the outside of the range hood is better captured, while the "wind grabbing" phenomenon between the main and secondary air inlets is reduced. In this embodiment, an oil net assembly 4 is detachably installed at the main air inlet 104 to filter the oil smoke flowing through the main air inlet 104; the secondary air inlet is composed of a plurality of strip filter holes 105 arranged at intervals to achieve primary filtering of the oil smoke flowing through the secondary air inlet. In addition, in order to reduce the escape of oil smoke at the air inlet, a smoke collecting chamber 1221 that is concave toward the inside and open to the front is provided on the front of the body 1, and the rear cavity wall of the smoke collecting chamber 1221 constitutes the smoke inlet surface 103.

[0036] refer to Figure 1-6 In this embodiment, the machine body 1 includes a box assembly 11, a shell assembly 12 and an isolation baffle 13. A mounting port is provided at the top of the shell assembly 12. A smoke collecting cavity 1221 with a front opening 1211 is recessed on the front of the shell assembly 12. The rear cavity wall of the smoke collecting cavity 1221 constitutes a smoke inlet surface 103 with an air inlet. The box assembly 11 is inserted into the mounting port and connected to the shell assembly 12. The box assembly 11 is connected to the shell assembly 12 and encloses a cavity together (not shown in the figure). The isolation baffle 13 is arranged in the cavity and divides the cavity into a main air duct 101 and a secondary air duct 102 that are independent of each other. A vent 131 is provided on the isolation baffle 13 for smoke to pass through and is connected to the main air duct 101. The main air duct 101 is used to be connected to the front air inlet 211 of the wind cabinet assembly 2 through the vent 131.

[0037] Furthermore, the housing assembly 12 includes a smoke hood 121 and a smoke baffle 122. The front of the smoke hood 121 is provided with a front opening 1211. The smoke baffle 122 is detachably mounted at the front opening 1211. A smoke collecting cavity 1221 opening forward is recessed on the smoke baffle 122. To facilitate the detachable mounting of the smoke baffle 122 on the smoke hood 121, convex edges (not shown in the figure) are provided on the four sides of the front opening 1211. A flange 1222 extending outward is integrally formed on the periphery of the smoke baffle 122. The flange 1222 abuts against the front of the convex edge, and the two are fastened and connected by screws. Of course, the two can also be connected by welding, bonding, riveting or magnetic attraction.

[0038] In this embodiment, the upper end of the isolation baffle 13 is arranged in the box assembly 11 and abuts or connects with the front of the box assembly 11, and the lower end is arranged in the shell assembly 12 and abuts or connects with the front of the shell assembly 12, so that the area of ​​the main air duct 101 enclosed by the isolation baffle 13, the box assembly 11 and the shell assembly 12 is larger, so that a larger wind cabinet assembly can be adapted. Of course, the isolation baffle 13 can also be completely arranged in the shell assembly 12 and cover the main air inlet 103, in which case a smaller wind cabinet assembly can be adapted.

[0039] Furthermore, the isolation baffle 13 includes a back plate and two side plates 132. The back plate is arranged in the smoke hood 121 and is located behind the smoke baffle 122 and the main air inlet. The lower end of the back plate extends downward to below the smoke inlet surface 103 and is connected or abutted with the front of the housing assembly 12. The back plate is provided with a vent 131 for smoke to pass through. The two side plates 132 are arranged on the left and right outer sides of the main air inlet 103, and the two side plates 132 are formed by the left and right ends of the back plate being integrally bent outward. The front end of each side plate 132 abuts against the back of the smoke baffle 122, the lower end is integrally formed with the lower end of the back plate, and the upper end extends upward into the box assembly and abuts against the lower end of the front of the box assembly 11. A vertical edge 1321 bent inwardly toward the front is integrally formed at the front end of each side panel 132 at the position corresponding to the smoke baffle 122. The vertical edge 1321 is tightly abutted against the back of the smoke baffle 122 to increase the contact area between the isolation baffle 13 and the smoke baffle 122, thereby improving the sealing between the two and preventing air cross-talk between the main and secondary air ducts.

[0040] In this embodiment, a lower guide portion 133 is provided at the lower end of the back plate of the isolation baffle 13. The lower guide portion 133 is a lower inclined surface or a lower arc surface arranged from back to front and tilted downward, and is used to quickly guide the oil smoke to the vent 131. An upper guide portion is provided at the upper end of the back plate of the isolation baffle 13. The upper guide portion is an upper inclined surface or an upper arc surface arranged from back to front and tilted upward, and is used to quickly guide the oil smoke to the vent 131.

[0041] refer to Figure 1-4 The range hood further comprises a wind cabinet assembly 2, which is obliquely installed in the secondary air duct 102. Of course, it can also be vertically installed in the secondary air duct 102, with its upper end located in the box assembly 11, and its lower end extending downward into the shell assembly 12 and located behind the main air duct 101, so that part of the wind cabinet assembly 2 extends into the shell assembly 12, thereby facilitating the reduction of the overall height of the machine body 1. The wind cabinet assembly 2 has a front air inlet 211 and a rear air inlet 212 arranged relatively, the rear air inlet 212 is connected to the secondary air duct 102, and the front air inlet 211 is connected to the main air duct 101 through the vent 131.

[0042] In this embodiment, the wind cabinet assembly 2 includes a volute 21, a double-suction impeller 22 and a driver 23. The volute 21 is installed in the secondary air duct 102 from top to bottom and tilted backward, and the volute has a front air inlet 211 and a rear air inlet 212 arranged relatively. The double-suction impeller 22 is rotatably arranged in the volute 21, and includes a middle disk 221 and a plurality of blades 222, and all the blades 222 are circumferentially spaced and arranged on the outer edge of the middle disk 221. The driver 23 is installed behind the middle disk 221 of the impeller 22, and has a rotating shaft 231 extending forward. The rotating shaft 231 is connected to the middle disk 221 of the impeller 22, and is used to drive the double-suction impeller 22 to rotate. Furthermore, the upper edge of the secondary air inlet is lower than the rotating shaft 231, so that the negative pressure area of ​​the secondary air inlet moves downward and closer to the smoke source, ensuring that the auxiliary air inlet channel can re-suck the oil smoke escaping from the main air inlet 103 to the outside of the range hood into the range hood without interfering with the main air inlet channel.

[0043] refer to Figure 7 The middle disk 221 divides each blade 222 into a front air intake section and a rear air intake section. The ratio of the length L1 of the front air intake section to the length L2 of the rear air intake section is α, α∈[1.6,2], α / γ∈[0.8,1.2]. In this way, by designing the position of the disk 221 of the double-suction impeller 22, the negative pressure distribution of the main air inlet 101 and the secondary air inlet is more reasonable, further improving the overall smoke collection effect of the range hood.

[0044] The wind cabinet assembly 2 also includes an air guide ring 24, which can be detachably installed at the front air intake port 211 of the volute 21 and is connected to the air vent 131 of the isolation baffle 13. In the present embodiment, the isolation baffle 13 can be installed on the front side of the volute 21 through the air guide ring 24. Of course, the isolation baffle 13 can also be directly installed on the front side of the volute 21 so that the isolation baffle 13 and the volute 21 are connected as a whole.

[0045] refer to Figure 1-4 The range hood further comprises a flap assembly 3, which is rotatably connected to a housing assembly 12 of the machine body 1, and is used to open or close the air inlet portion to ensure that when the flap assembly 3 is in a closed state, the main air inlet 103 and each secondary air inlet can be completely blocked.

[0046] Since the range hood of the present application has a main air inlet channel and two auxiliary air inlet channels, the negative pressure provided by the main air inlet 103 located in the middle guides the entire path of the oil smoke to the main air inlet of the impeller in the middle of the hood; the secondary air inlets located on both sides and closer to the smoke source are used to capture the oil smoke escaping from the main air inlet 103 to the outside of the range hood, so that the overall smoke collection effect of the range hood is improved. Most of the oil smoke enters the main air inlet channel. Due to the presence of the isolation baffle 13, the oil smoke entering the interior of the range hood will be discharged by the wind cabinet assembly 2 to the public flue or the external environment, and will not flow and diffuse in the space of the body 1 except the wind cabinet assembly 2. At the same time, the negative pressure of the auxiliary air inlet channel is provided by the rear air inlet section blades of the double-suction impeller. The area of ​​the secondary air inlet matches the length of the rear air inlet section of the corresponding blade, and the secondary air inlet is closer to the smoke source. Therefore, the auxiliary air inlet channel can re-inhale the oil smoke escaping from the main air inlet to the outside of the range hood into the range hood without interfering with the main air inlet channel. Figure 8 The air flow velocity distribution of the three-chamber air intake of the present application, the traditional single-chamber air intake and the traditional two-chamber air intake is shown. It can be seen that under the same air volume, the effective air intake area of ​​the range hood of the present application in the width direction is significantly increased, and it has a better smoke collection effect.

[0047] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A range hood, characterized in that: include: A machine body (1), wherein a main air duct (101) and a secondary air duct (102) located outside the main air duct (101) are formed inside the machine body (1), the machine body (1) has a smoke inlet surface (103), an air inlet portion for smoke to pass through is provided on the smoke inlet surface (103), the air inlet portion comprises a main air inlet (104) and at least one secondary air inlet, the main air inlet (104) is connected to the main air duct (101), the secondary air inlet is arranged outside the left or right side of the main air inlet (104) and is connected to the secondary air duct (102), The ratio of the air inlet area of ​​the main air inlet (104) to the air inlet area of ​​the secondary air inlet is γ, γ∈[2,10].

2. A range hood according to claim 1, characterized in that: The upper edge of the secondary air inlet is lower than the upper edge of the main air inlet (104); and / or the secondary air inlet is composed of a plurality of strip-shaped filter holes (105) arranged at intervals.

3. A range hood according to claim 1 or 2, characterized in that: The machine body (1) comprises a box assembly (11), an outer shell assembly (12) and an isolation baffle (13); the box assembly (11) is mounted on the top of the outer shell assembly (12) and together they enclose a cavity; the isolation baffle (13) is arranged in the cavity and divides the cavity into a main air duct (101) and a secondary air duct (102); a vent (131) for smoke to pass through and connected to the main air duct (101) is provided on the isolation baffle (13); and the smoke inlet surface (103) is arranged on the outer shell assembly (12).

4. The range hood according to claim 3, characterized in that: The isolation baffle (13) comprises a back plate and two side plates (132); the back plate is arranged in the housing assembly (12) and is located behind the main air inlet (104); the vent (131) is provided on the back plate; the two side plates (132) are arranged on the left and right outer sides of the main air inlet (104), and the rear ends of the two side plates (132) are respectively fixedly connected to the left and right ends of the back plate, and the front ends are respectively connected to or abut against the smoke inlet surface (103).

5. The range hood according to claim 4, characterized in that: The lower end of the back panel extends downward to below the smoke inlet surface (103) and is connected to or abuts against the front surface of the outer shell assembly (12); the upper end of the back panel and the upper ends of the two side panels (132) both extend upward into the box assembly (11) and are respectively abutted against or connected to the front surface of the box assembly (11).

6. The range hood according to claim 3, characterized in that: A lower flow guide portion (133) is provided at the lower end of the back plate of the isolation baffle (13), and / or an upper flow guide portion is provided at the upper end of the back plate of the isolation baffle (13).

7. A range hood according to claim 1 or 2, characterized in that: It also comprises a wind cabinet component (2), the wind cabinet component (2) being installed in the secondary air duct (102) and having a front air inlet (211) and a rear air inlet (212) arranged relatively to each other, the rear air inlet (212) being connected to the secondary air duct (102), and the front air inlet (211) being connected to the main air duct (101).

8. The range hood according to claim 7, characterized in that: The wind cabinet component (2) comprises a volute (21) and a double-suction impeller (22), wherein the volute (21) has a front air inlet (211) and a rear air inlet (212) arranged relatively to each other, and the double-suction impeller (22) is rotatably arranged in the volute (21) and comprises a middle disk (221) and a plurality of blades (222), wherein all the blades (222) are circumferentially spaced and arranged on the outer edge of the middle disk (221), and the middle disk (221) divides each blade (222) into a front air inlet section and a rear air inlet section, and the ratio of the length of the front air inlet section to the length of the rear air inlet section is α, and α / γ∈[0.8,1.2].

9. The range hood according to claim 7, characterized in that: The lower end of the wind cabinet assembly (2) is located behind the main air duct (101), and the upper edge of the secondary air inlet is lower than the rotation axis (231) of the wind cabinet assembly (2).

10. A range hood according to claim 1 or 2, characterized in that: It also comprises a flap assembly (3), wherein the flap assembly (3) is rotatably connected to the machine body (1) and is used to open or close the air inlet.

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