Range hood

Abstract

The utility model discloses a range hood which comprises an exhaust fume collecting hood and an air bellow arranged above the exhaust fume collecting hood, a fan and an oil fume separator are arranged in the air bellow, the oil fume separator comprises a separation disc, the separation disc comprises a central disc, separation spokes are distributed in the circumferential direction of the central disc, an air inlet of the fan corresponds to the central disc, and an air outlet of the fan corresponds to the central disc. The diameter of the central disc is 0.4-1 time of that of the air inlet of the fan; the distance between the central point of the air inlet of the fan and the rotating central axis of the oil fume separator is 0-7cm; the rotating speed of the fan is not less than 1.2 times of that of the separating disc. According to the utility model, sound waves generated by the wind wheel and the oil-smoke separator are transmitted to the air outlet, so that the transmission to people is reduced, and the exhaust effect is not influenced. The technical problems of large suction force and large noise of the range hood are solved, the durable large suction force of the range hood is ensured, and frequent manual cleaning is not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, and particularly relates to an oil fume machine. Background Art

[0002] China is a big country in terms of diet, but the cooking fumes pose a threat to every family member. Traditional oil fume machines not only discharge the fumes directly, polluting the atmosphere, but also, after working for a period of time, the smoke exhaust effect drops significantly, and the noise increases sharply, requiring frequent manual cleaning. The reason is that the impeller is extremely easy to be contaminated by oil stains, and the accumulation of oil stains leads to a decrease in the motor speed and a decrease in the air intake of the impeller. To solve this problem, the existing technology is to set at least one high-speed rotating separation disk, commonly known as an oil throwing disk, at the air inlet of the oil fume machine. Some also directly set the interception disk on the impeller and run synchronously with the impeller. The high-speed rotating dynamic interception disk collides with the oil fume molecules, adsorbs on the spokes, and then is thrown out by centrifugal force, thereby realizing oil fume separation and ensuring that the inside of the oil fume machine is no longer contaminated by oil stains.

[0003] Chinese Patent CN201020056752.7 discloses a dynamic interception recovery and purification oil fume machine for household kitchens, which uses at least one dynamic physical shield to separate oil fumes at the hood opening of the oil fume machine, and has a certain effect, but the noise is particularly loud. The reason is that the high-speed rotating dynamic interception disk sweeps the air, generating high-frequency noise. Moreover, due to conditions, a large-diameter disk cannot be installed, resulting in too fast air speed and generating a whistling low-frequency noise (two frequencies of noise). At the same time, since the dynamic physical shield is set facing people, the two frequencies of noise plus the noise generated by the fan have a great impact on people, which is also the reason why this product is still difficult to be promoted in the market. Chinese Patent 92211191.x discloses a structure for separating oil stains from an oil fume machine that can be disassembled without cleaning, and installs a spoke-shaped filter screen on the extension shaft of the fan motor and rotates synchronously with the fan. Since it is relatively close to the impeller, the rotating filter screen forms a large wind resistance, seriously blocking the air. At the same time, due to the same rotation speed, resonance is easily formed, generating greater noise, and this product has gradually disappeared from the market.

[0004] Chinese Patent 201710923578.8 discloses an oil fume extractor. The utility model provides an oil fume machine that improves the oil fume extraction rate and the grease separation effect. Although a silencing device is provided between the fan and the rotating interception disk, due to limited space, the silencing air duct is short and the silencing effect is limited. Moreover, the silencing device is easily contaminated by oil stains and fails. At the same time, since the fan outlet and the high-speed rotating interception disk are directly facing people, a direct sound transmission channel is formed, resulting in a horn effect and generating a lot of noise. Content of the Utility Model

[0005] To solve the noise problem of the range hood, the present utility model proposes a range hood, which realizes the propagation of the sound waves generated by the impeller and the oil fume separator to the air outlet through the designed oil fume separation disk structure and installation method, reduces the propagation to people, and thus reduces the noise affecting people.

[0006] The technical solution adopted by the present utility model is to design a range hood, which includes a smoke collecting hood and an air box arranged above the smoke collecting hood. A fan and an oil fume separator are arranged in the air box. The oil fume separator includes a separation disk, and the separation disk includes a central disk. Separation spokes are circumferentially distributed on the central disk. The air inlet of the fan corresponds to the central disk. The diameter of the central disk is 0.4 to 1 times that of the air inlet of the fan, and the distance from the center point of the air inlet of the fan to the rotation central axis of the oil fume separator is 0 to 7 cm: the rotation speed of the fan is not less than 1.2 times that of the separation disk.

[0007] In some embodiments, the rotation speed of the fan is 1200 - 2000 revolutions per minute, and the rotation speed of the oil mist separator motor is 880 - 980 revolutions per minute.

[0008] In some embodiments, the diameter of the separation spokes is 1.2 - 3.0 mm.

[0009] In some embodiments, the included angle between the lead line of the distance from the outer edge of the air inlet of the fan to the outer circle of the separation disk and the separation disk surface is 15° - 55°.

[0010] In some embodiments, the length of the air inlet of the air box is 400 - 530 mm, the width is 45 - 95 mm, and the cross-sectional area is 0.02 - 0.04 ㎡.

[0011] In some embodiments, the opening ratio of the central disk ≤ 25%.

[0012] In some embodiments, the central disk is a solid disk.

[0013] In some embodiments, an oil fume separation chamber is arranged in the air box. The oil fume separation chamber is located between the air inlet of the fan and the air inlet of the air box. The separation disk is located in the oil fume separation chamber. Radially, the edge of the separation disk corresponds to the inner side wall of the separation chamber. A oil blocking convex rib is circumferentially arranged on the inner side wall of the separation chamber between the separation disk and the air inlet of the fan.

[0014] In some embodiments, the inner cavity of the separation chamber is a tubular cavity. A circle of the oil blocking convex rib is arranged at the port of the tubular cavity corresponding to the air inlet of the fan. The other end of the tubular cavity is located above the air inlet of the air box. An oil box for collecting the oil flowing out from the air inlet of the air box is arranged below the air inlet of the air box.

[0015] Compared with the prior art, the present utility model has the following beneficial effects:

[0016] 1. Most of the wind noise generated by the wind wheel of the present utility model is blocked by the central disk and returns, and is transmitted out from the air outlet of the fan.

[0017] 2. The separation disk of the present utility model generates sound waves when rubbing against the wind. Most of the sound waves are first transmitted in the oil fume separation chamber. Since the oil fume separation chamber is a circular pipe, it can only propagate in two directions, namely, towards the two ends of the pipe body. It enters the fan on the left, and after a complex path, it is transmitted to the fan outlet. On the right, it hits the fan back plate and is refracted and returned. Only a small amount of sound waves enter the smoke collecting hood through the diffused ventilation box air inlet. Since the direction of the sound wave is opposite to that of the air inlet, and the air inlet is narrow and the wind speed is fast, the sound waves in the air box are further reduced from being transmitted to the smoke collecting hood. The sound waves generated by the wind wheel and the oil fume separator are transmitted to the air outlet, reducing the transmission to people, and at the same time not affecting the exhaust effect. It solves the technical problem of large suction and high noise of the range hood, ensures the continuous large suction of the range hood, and does not require frequent manual cleaning. Description of the Drawings

[0018] The following will describe the present utility model in detail with specific embodiments and drawings. For the purpose of showing details and facilitating the understanding of its principle, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:

[0019] Figure 1 is a schematic cross-sectional view of the use state of the range hood in the first embodiment.

[0020] Figure 2 is a schematic diagram of the oil fume separator in the first embodiment.

[0021] In the figure, 1. Smoke collecting hood; 2. Air box; 3. Fan; 4. Central disk; 5. Motor; 6. Separation spokes; 7. Outer circle; 8. Fan air inlet; 9. Air box air inlet; 10. Straight circular pipe; 11. Step; 12. Oil box; 13. Separation disk. Detailed Embodiments

[0022] The following are specific embodiments of the present utility model, and the technical solutions of the present utility model will be further described in conjunction with the drawings. However, the present utility model is not limited to these embodiments, and the following embodiments do not limit the utility model involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solution of the utility model.

[0023] The principle and structure of the present utility model will be described in detail below with reference to the drawings and embodiments.

[0024] First Embodiment

[0025] As Figure 1 、2 As shown in the figure, an oil fume extractor includes a smoke collecting hood 1 located above the cooking range and a blower box 2 provided above the smoke collecting hood. A blower 3 and an oil fume separator are arranged inside the blower box. The oil fume separator includes a separation disc 13. The separation disc includes a central disc 4. The central disc is fixedly connected to the shaft of a motor 5 and can be driven by the motor to rotate. Separation spokes 6 are circumferentially distributed on the central disc. The separation spokes are evenly distributed radially between the central disc and the outer ring 7. The air inlet of the blower corresponds to the central disc. The aperture ratio of the central disc is ≤ 25%. The separation spokes are smooth round bars with a diameter of 1.2 - 3.0 and are evenly distributed radially between the central disc and the outer ring.

[0026] In order to reduce the noise conduction of the blower, the air inlet of the blower faces the central disc. The central disc is preferably solid, so that the sound waves generated by the blower are reflected back. The central disc cannot be too small relative to the air inlet, otherwise the sound wave reflection surface is too small to play a noise reduction role, nor can it be too large, otherwise it will block the wind. The preferred size of the central disc is: the diameter of the central disc is 0.4 - 1 times the diameter of the air inlet of the blower.

[0027] The central disc cannot deviate too much from the air inlet 8 of the blower. The preferred position is: the distance from the center point of the air inlet of the blower to the rotation central axis of the oil fume separator is 0 - 7 cm. Further, in order to prevent the impeller from resonating with the separation disc and their motor speeds are inconsistent, and at the same time not affecting the smoking effect, the preferred ratio is: the rotation speed of the blower is more than 1.2 times the rotation speed of the separation disc. The best rotation speed of the blower is 1200 - 2000 revolutions per minute, and the rotation speed of the separation disc is 880 - 980 revolutions per minute (6 - pole motor). In this way, it not only ensures the smoking effect, does not increase the cost, but also reduces the noise to a lower value.

[0028] The distance between the air inlet and the separation disc should not be too close, otherwise it is easy to block the wind, nor should it be too far, otherwise the reflected sound waves will decrease. The diameter of the separation disc cannot be too small, otherwise the air flow speed is too fast and the separation of oil fume decreases. Nor can it be too large, otherwise it will cause an increase in noise and production cost. The preferred position and size are: the angle α between the lead line of the shortest distance from the outer edge of the air inlet of the blower to the outer ring of the separation disc and the plane of the separation disc is 15° - 55°, that is, from any point on the outer edge of the air inlet, draw a line to the nearer outer ring of the separation disc, and the angle α formed by this line and the plane where the separation surface is located is 15° - 55°.

[0029] The rotating separation disc will also generate noise. To maximally block the conduction of its sound waves, the above - mentioned blower box is below the motor of the separator, that is, a relatively narrow and small air inlet 9 is opened on the bottom plate of the blower box. Its size is that the length of the air inlet of the blower box is 400 - 530 mm, the width is 45 - 95 mm, and the cross - sectional area is 0.02 - 0.04 ㎡, so as to prevent the sound waves from spreading out in the blower box.

[0030] A fume separation bin is arranged inside the bellows. The fume separation bin is located between the air inlet of the fan and the air inlet of the bellows. The separation disk is located inside the fume separation bin. Radially, the edge of the separation disk corresponds to the inner side wall of the separation bin. A oil-blocking rib is circumferentially arranged on the inner side wall of the separation bin between the separation disk and the air inlet of the fan. The inner cavity of the separation bin is a tubular cavity. A circle of the oil-blocking ribs is arranged at the port of the tubular cavity corresponding to the air inlet of the fan. The other end of the tubular cavity is located above the air inlet of the bellows. An oil box is arranged below the air inlet of the bellows for collecting the oil flowing out from the air inlet of the bellows. In this embodiment, the motor controlling the central disk is preferably fixed on the back plate of the bellows, and secondly fixed on the fume separation bin through a bracket. The separation disk is arranged inside the fume separation bin and keeps a certain distance from the inner side wall of the fume separation bin. The fume separation bin is installed and fixed on the inner wall of the bellows, and the side wall is sealed with the inner side wall of the bellows to prevent the fume from entering the fan without being separated. As shown in the figure, the oil separation bin is a straight circular pipe 10, forming a separation cavity. One end of the circular pipe close to the fan is internally provided with a circle to form a step 11 as the oil-blocking rib to prevent the separated oil from flowing towards the fan and polluting the wind wheel. The other end of the separation bin is flat, which is convenient for the separated oil to flow out, flow towards the smoke collecting hood through the air inlet of the bellows, and fall into the oil box 12 for collection. When the fume passes through the separation spokes, the oil particles in the fume will adhere to the separation spokes. Under the action of the rotation of the separation disk, the adhered oil will be thrown onto the inner side wall of the separation cavity.

[0031] According to the principle of linear propagation of sound waves, the separation disk generates sound waves when rubbing against the wind. Most of the sound waves are first transmitted in the fume separation bin. Since the fume separation bin is a circular pipe, it can only propagate in two directions, namely, towards the two ports of the pipe body, towards the left into the fan, and after a complex path, towards the fan outlet. Towards the right, it hits the back plate of the fan and is refracted back. Only a small amount of sound waves enter the smoke collecting hood through the diffused air inlet of the bellows. Since the direction of the sound wave is opposite to that of the air inlet and the air inlet is narrow and the wind speed is fast, the sound waves in the bellows propagating towards the smoke collecting hood are further reduced. The utility model propagates the sound waves generated by the wind wheel and the fume separator towards the air outlet, reduces the propagation towards people, and does not affect the exhaust effect at the same time. It solves the technical problem of large suction and high noise of the range hood, ensures the long-term large suction of the range hood, and does not require frequent manual cleaning.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements or use similar methods to replace the described specific embodiments, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A range hood, comprising a fume hood and a bellows disposed above the fume hood, wherein a fan and a fume separator are disposed in the bellows, wherein the fume separator comprises a separation plate, wherein the separation plate comprises a center plate, and wherein separation spokes are distributed circumferentially on the center plate, wherein: The fan air inlet corresponds to the center disk, the diameter of the center disk is 0.4 to 1 times of the fan air inlet, and the distance between the center point of the fan air inlet and the rotation center axis of the oil fume separator is 0 to 7 cm: the fan speed is not less than 1.2 times the separation disk speed.

2. The range hood according to claim 1, characterized in that: The fan speed is 1200-2000 rpm, and the oil mist separator motor speed is 880-980 rpm.

3. The range hood according to claim 1, characterized in that: The separated spoke diameter is 1.2-3.0 mm.

4. The range hood according to claim 1, characterized in that: The angle between the distance line from the outer edge of the fan air inlet to the outer ring of the separation disk and the separation disk surface is 15°-55°.

5. The range hood according to claim 1, characterized in that: The air inlet of the bellows has a length of 400 to 530 mm, a width of 45 to 95 mm, and a cross-sectional area of ​​0.02 to 0.04 m2.

6. The range hood according to claim 1, characterized in that: The opening rate of the central disk is ≤25%.

7. The range hood according to claim 6, characterized in that: The central disk is a solid disk.

8. The range hood according to claim 1, characterized in that: An oil fume separation bin is provided in the bellows, and the oil fume separation bin is located between the fan air inlet and the bellows air inlet. The separation plate is located in the oil fume separation bin, and the edge of the separation plate corresponds to the inner side wall of the separation bin in the radial direction. The inner side wall of the separation bin is circumferentially provided with an oil-blocking ridge located between the separation plate and the fan air inlet.

9. The range hood according to claim 8, characterized in that: The inner cavity of the separation bin is a tubular cavity, and a circle of oil-blocking ridges is arranged at the port of the tubular cavity corresponding to the air inlet of the fan, the other end of the tubular cavity is located above the air inlet of the bellows, and an oil box for collecting oil flowing out of the air inlet of the bellows is arranged below the air inlet of the bellows.

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