Range hood and size control method thereof

Abstract

The present invention discloses a range hood and a method for controlling the size of a range hood. The range hood includes a fan and a power box. The inner cavity of the power box is connected to the area where the fan's impeller is located via an air duct. The maximum flow rate of the fan is Q, and the maximum air intake volume that the air duct can convey is Q1. The ratio Q1 / Q must be no greater than 0.1. An air duct is provided to introduce air with a lower temperature outside the fan into the power box and blow air to cool the power board and other electronic components in the power box. The air duct is connected to the fan's impeller so that the range hood does not need an additional wind system to blow air to the power box, thereby reducing manufacturing costs. By limiting the ratio of the fan's maximum flow rate to the maximum air intake volume that the air duct can convey, the cooling requirements of the power box and the power board can be met, while also preventing flow dispersion from affecting the main flow of the range hood's exhaust channel.

Description

Technical Field

[0001] The present invention relates to the technical field of gas cookers, and in particular to a range hood and a size control method thereof. Background Art

[0002] As an indispensable household appliance in the kitchen, the range hood has always been popular among users. It is used to purify the air in the kitchen to prevent users from being choked by cooking fumes, protect the user's respiratory tract and lungs, and improve the user's cooking experience.

[0003] When a range hood is operating, a certain amount of power is lost when current passes through the electronic components of the power board, generating heat. This heat is currently dissipated primarily through the heat sink on the power board. If the heat cannot be dissipated in time, the electronic components will continue to heat up, which not only affects the conversion efficiency but also may damage the electronic components if it is operated for a long time. In the prior art, power board heat dissipation is mainly achieved through natural heat dissipation through heat sink fins, which has low heat dissipation efficiency. To improve heat dissipation efficiency, the market generally increases the size of the heat sink to increase the heat dissipation area. This solution not only increases the cost of the heat dissipation module but also increases the size of the power board. The large area occupied by the heat sink may make it difficult to arrange the heat. Some solutions coat the heat sink with thermally conductive silicone to transfer heat to the power box for heat dissipation. However, the performance of the thermal silicone gradually weakens over time, resulting in poor heat dissipation. Other range hoods add a small fan to the power board for turbulent heat dissipation. This not only increases the manufacturing cost of the range hood, but also causes the relatively high air temperature near the power board. If the turbulent airflow cannot be discharged in time, the heat cannot be dissipated in time. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the heat-generating power board cannot be effectively cooled and the cooling cost is high, and to provide a range hood and a size control method for the range hood.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A range hood comprises a fan and a power supply box, wherein the inner cavity of the power supply box is connected to the area where the impeller of the fan is located through an air duct, the maximum flow rate of the fan is Q, the maximum air intake volume that can be delivered by the air duct is Q1, and the ratio of Q1 / Q must be no greater than 0.1.

[0007] In this solution, the fan of the range hood itself has a smoke exhaust channel, and the amount of air that the smoke exhaust channel can inhale when the fan is started is the maximum flow rate Q of the fan. The range hood also includes an air duct, which is used to introduce air with a lower temperature outside the range hood into the power box and cool the power board in the power box. The cooled air is introduced into the fan through the air duct so that the fan can absorb air and drain it from the air duct to the power box. The maximum air intake of the air duct is Q1. By limiting the ratio of the air intake volume of the air duct to the air intake volume of the fan, the air flow rate attracted by the fan can be dispersed through the air duct when the fan is started, which can not only ensure effective heat dissipation for the power board, but also ensure that the air flow dispersed by the air duct has little effect on the air flow rate attracted by the fan. In other words, the range hood is less affected by the absorption of air mixed with oil smoke, avoiding a major impact on the normal absorption of air mixed with oil smoke by the range hood, improving the user experience and ensuring the service life of the electronic components of the power box.

[0008] Preferably, the ratio of Q1 / Q is less than 0.1 and greater than 0.05.

[0009] In this solution, the ratio range of Q1 to Q is further limited so that the air duct can ensure that enough low-temperature air enters the power box to remove the heat of the power board and effectively control the impact of the air duct flow on the fan flow.

[0010] Preferably, the upper cover of the power box is provided with an air inlet, the lower cover of the power box is provided with an air outlet, and one end of the air duct is connected to the air outlet.

[0011] In this solution, the air inlet and the air outlet are arranged on the upper cover and the lower cover along the height direction of the power box, so that when the impeller of the fan is started, the lower temperature air outside the power box is attracted through the air duct. In the process of the lower temperature air flowing from the air inlet to the air outlet, the high temperature on the surface of the electronic components in the power box can be mixed with the lower temperature air and flow into the air outlet and the air duct.

[0012] Preferably, a power board parallel to the upper cover is provided in the inner cavity of the power box, and there are multiple air inlets, which are spaced apart along the extension direction of the power board.

[0013] In this solution, multiple air inlets are provided and all of the multiple air inlets are provided on the upper cover of the power box, so as to blow the air with lower temperature to various positions inside the power box and different positions of the power board. By arranging multiple air inlets in the vertical direction and arranging the power board in the horizontal direction, effective cooling of the power board can be achieved.

[0014] Preferably, the distance between the air outlet and the power board is h, and h satisfies a first preset value or greater than or equal to a first preset value and a second preset value or less than or equal to a second preset value; wherein the first preset value is max The second preset value is m i and n i is the correction coefficient, i=1, 2, the correction coefficient m i The value range is 5≤m i ≤15, the correction factor n i The value range is 1≤n i ≤10, and m2=Ln1, n2=Ln1, the value range of L is 1.5≤L≤3, the area of ​​the air outlet is S2, the area of ​​the power board is S3, the circumference of the power board is C3, the cross-sectional area of ​​the power box parallel to the power board is S4, and the height of the power box is H.

[0015] In this solution, the air outlet is arranged on the lower cover and below the power board. The power board and the air outlet are spaced apart in the height direction of the power box with a spacing of h. By setting h to be greater than or equal to a first preset value and less than or equal to a second preset value, when the air with lower temperature enters the power box, there is enough spacing between the power board and the air outlet so that the air with lower temperature mixes with the heat on the power board and flows from the bottom of the power board, that is, between the power board and the air outlet and finally flows into the air outlet. The actual range of h is calculated by the formula. Within this range, the height of h can meet the requirement of sufficient air with lower temperature to enter the power box and effectively cool the power board. At the same time, the height of h within this range can also meet the requirement that the air flow entering the air duct has little effect on the flow of the fan, and the ability of the fan to attract air mixed with oil smoke will not be significantly weakened, thereby avoiding affecting the normal function of the range hood.

[0016] Preferably, the average wind speed between the power board and the air inlet is C4, and the value of C4 must be greater than or equal to 1;

[0017] in,

[0018] In this solution, the average wind speed between the power board and the air inlet is limited so that the air flow entering the power box is restricted, thereby achieving sufficient cooling of the power board while avoiding affecting the fan's own suction force on air mixed with oil smoke.

[0019] Preferably, the area of ​​the air outlet is greater than or equal to the outlet area of ​​the air duct and less than or equal to min(0.3S3, 2S1);

[0020] Wherein, the outlet area of ​​the air duct is S1.

[0021] In this solution, by limiting the area of ​​the air outlet and the range of the outlet area of ​​the air duct, when the air that carries away the surface temperature of the power board flows from the air outlet into the air duct and flows out from the outlet of the air duct, the air duct will not generate resistance to the air flow, thereby improving the cooling efficiency of the power board.

[0022] Preferably, the sum of the areas of the plurality of air inlets is S5, and 0.1S4≤S5≤0.5S4.

[0023] In this solution, the area of ​​multiple air inlets and the area parallel to the power box and the power board are limited so that the air flow entering the power box is restricted, thereby meeting the ratio of Q1 to Q.

[0024] Preferably, the outlet direction of the air duct is consistent with the air inlet direction of the fan, and the axial direction of the outlet of the air duct is arranged parallel to the axial direction of the impeller.

[0025] In this solution, the outlet of the air duct is arranged toward the air inlet direction of the fan, that is, the air flowing out of the outlet of the air duct directly enters the impeller of the fan. By arranging the outlet of the air duct parallel to the axial direction of the impeller, the convenience of air flowing out of the outlet of the air duct is further improved, avoiding the obstruction of air flowing out of the outlet due to different outlet directions, thereby affecting the cooling efficiency of the power board.

[0026] A method for controlling the size of a range hood is implemented using the above-mentioned range hood, and the method for controlling the size of a range hood comprises the following steps:

[0027] S1. Set the power box in the horizontal direction and the power board in the horizontal direction inside the power box. Set the distance between the air outlet of the power box and the power board in the vertical direction to h, where h satisfies greater than or equal to and less than or equal to

[0028] S2. Set the area of ​​the air duct outlet to S1, and set the area of ​​the air outlet and the area of ​​the air duct outlet to satisfy S1≤S2≤min(0.3S3, 2S1);

[0029] S3, set the sum of the areas of the air inlets to S5, and satisfy 0.1S4≤S5≤0.5S4;

[0030] The area of ​​the power board is S3, and the cross-sectional area of ​​the power box parallel to the power board is S4.

[0031] In this solution, the actual range of h is limited so that the distance between the power board and the air outlet is limited, and within this actual range, the air can flow smoothly into the air outlet without affecting the flow rate of the fan, thereby ensuring the normal absorption function of the fan for air mixed with oil smoke; further, by limiting the outlet area of ​​the air duct and the area of ​​the air outlet, the areas of the outlet and the air outlet of the air duct are kept within a preset range, which enables the air to be discharged smoothly from the air duct without obstruction, thereby avoiding reducing the heat dissipation efficiency of the power board; in addition, by limiting the area of ​​the air inlet and the area parallel to the power box and the power board, the actual air flow entering the power box is guaranteed. Within this range, the flow entering the power box can meet the ratio of Q1 to Q, that is, it effectively cools the power board without affecting the flow rate of the fan, thereby ensuring the normal absorption function of the fan for air mixed with oil smoke.

[0032] The positive progressive effect of the present invention is that the present invention sets an air duct to introduce the air with lower temperature outside the fan into the power box and blows air to cool the power board and other electronic components in the power box; connects the outlet of the air duct with the impeller of the fan to form a negative pressure area when the impeller starts, and introduces the air with lower temperature outside the fan from the power box into the air duct and finally flows to the fan, so that the range hood does not need to set up an additional wind system to blow air to the power box, thereby reducing the manufacturing cost of the range hood; and by limiting the ratio of the maximum flow rate of the fan to the maximum air intake volume that the air duct can deliver, the air flow entering the air duct can meet the cooling requirements of the power box and the power board, and at the same time can avoid the air flow entering the air duct from dispersing the main flow of the exhaust channel of the range hood, thereby avoiding the range hood's ability to absorb air mixed with oil smoke being reduced due to excessive air flow in the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 FIG1 is a three-dimensional diagram of a range hood according to an embodiment of the present invention.

[0034] Figure 2 FIG. 1 is a diagram showing the positional relationship between a power board and a power box according to an embodiment of the present invention.

[0035] Figure 3 FIG. 1 is a diagram showing the positional relationship between the air outlet and the air duct according to an embodiment of the present invention.

[0036] Figure 4 FIG. 1 is a diagram showing the positional relationship between the outlet of the air duct and the impeller according to an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] Fan 1

[0039] Power Box 2

[0040] Air Inlet 21

[0041] Air outlet 22

[0042] Power board 23

[0043] Upper cover 200

[0044] Lower cover 201

[0045] Air duct 3

[0046] Exit 31

[0047] Fixing 4

[0048] Solenoid valve 5

[0049] Power box height H

[0050] The height distance between the power board and the air outlet h

[0051] The impeller axis is vertically upward Y

[0052] The impeller axis is horizontally to the right X DETAILED DESCRIPTION

[0053] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0054] The present invention provides a range hood, the specific structure of which is as follows Figure 1 、 Figure 2 and Figure 3As shown, the range hood includes a fan 1 and a power box 2. The fan 1 includes an impeller and a motor coaxially arranged with the impeller. The motor is used to drive the impeller to rotate. When the impeller rotates, a negative pressure zone is formed in the middle area of ​​the impeller 1. The negative pressure zone can attract air outside the range hood. This is the existing technology and will not be elaborated on here. The power box 2 is a rectangular structure, the bottom of which is arranged on the surface of the shell of the range hood. An air inlet 21 is arranged on the top of the power box 2. The bottom of the power box 2 passes through the shell of the range hood and is provided with an air outlet 22. The air outlet 22 is connected to the air duct 3. The air duct 3 is a cylindrical pipe and the outlet 31 of the air duct 3 is connected to the area where the impeller is located. An inner cavity is formed inside the power box 2. Since the air inlet 21 and the air outlet 22 are connected, the inner cavity actually forms a channel for air circulation. The impeller is driven by a motor to rotate so that the air with a lower temperature outside the range hood can be introduced into the power box 2 when the impeller rotates, and flows into the air duct 3 from the air outlet 22 and finally flows to the negative pressure area. The air in the negative pressure area passes through the exhaust channel of the range hood. When the air is discharged and the temperature is relatively low, it can take away the heat from the surface of each structure in the power box 2 when entering the power box 2, that is, it can cool the structure in the power box 2, so that the structure with a larger current is always in a normal working temperature state, thereby ensuring the service life of each structure in the power box 2 and the service life of the range hood. This structure does not need to set up an additional fan to drive the air turbulence, but uses the suction force generated by the range hood itself when it starts to attract the air so that the air with a relatively low temperature can smoothly enter the power box 2, thereby achieving effective cooling inside the power box 2, avoiding the situation where electronic components are burned out due to excessive current, and greatly reducing the manufacturing cost of the range hood. It has a simple structure and is more convenient to use.

[0055] Furthermore, the maximum flow rate of the fan 1 is Q, the maximum air intake volume that the air duct 3 can deliver is Q1, and the range hood in this embodiment needs to meet the ratio of Q1 / Q not greater than 0.1.

[0056] Specifically, the range hood is provided with an air inlet corresponding to the stove, and the range hood itself has a smoke exhaust channel. The air inlet is used to absorb the oil smoke generated when the stove is cooking, that is, air mixed with oil smoke. When the fan 1 is started, it attracts the oil smoke around the air inlet. The oil smoke enters the smoke exhaust channel through the air inlet and is finally discharged from the kitchen. This is the existing technology and will not be elaborated on here. When the fan 1 is started, the air intake and the air duct 3 actually attract air in the kitchen, that is, in the same space. Part of the air flow is introduced into the air intake of the range hood through the air duct 3, which disperses part of the flow. By setting the flow of oil smoke absorbed by the fan 1 at the air intake to Q, and setting the maximum air intake volume of the air duct 3 for the air with a lower temperature outside the range hood when the fan 1 is started to Q1, and limiting the ratio of Q1 to Q not more than 0.1, it can ensure that the power board 23 or other electronic components in the power box 2 are effectively blown and dissipated. At the same time, it can also ensure that the flow of the fan 1 dispersed by the air duct 3 has little effect on the flow of air attracted by the fan 1, that is, the range hood is less affected by the absorption of air mixed with oil smoke, avoiding a major impact on the normal absorption of air mixed with oil smoke by the range hood, thereby avoiding the situation where the suction at the air intake of the range hood becomes weak and cannot effectively absorb oil smoke when the air flow entering the air duct 3 is large, thereby improving the user experience and ensuring the service life of the electronic components of the power box 2.

[0057] At the same time, the ratio of Q1 / Q is less than 0.1 and greater than 0.05. By further limiting the ratio range of Q1 to Q, the air flow from the air inlet 21 of the power box 2 into the air duct 3 is sufficient and sufficient air with lower temperature is ensured to enter the power box 2 and be used to take away the heat of the power board 23 and effectively control the impact of the flow in the air duct 3 on the fan flow.

[0058] The power box 2 in this embodiment is provided with an upper cover 200 and a lower cover 201 in parallel. The upper cover 200 and the lower cover 201 are arranged along the height direction of the power box 2. The air inlet 21 is located on the upper cover 200 and passes through the upper cover 200. The air outlet 22 is located on the lower cover 201 and passes through the lower cover 201. The inlet of the air duct 3 passes through the air outlet 22 and is fixedly connected to the lower cover 201. The outlet 31 of the air duct 3 extends to the area where the impeller is located, so that when the impeller of the fan 1 is started, the lower temperature air outside the power box 2 is attracted through the air duct 3. In the process of the lower temperature air flowing from the air inlet 21 to the air outlet 22, the high temperature on the surface of the electronic components in the power box 2 can be mixed with the lower temperature air and flow into the air outlet 22 and the air duct 3.

[0059] And as Figure 4As shown, a fixing member 4 is provided around the outlet 31 of the air duct 3. The air duct 3 in this embodiment is described using a cylindrical pipe as an example. Of course, the air duct 3 can also be a pipe of other shapes, such as a rectangular pipe, which can also achieve air suction. This is a prior art and will not be described in detail here. The fixing member 4 is an annular structure and is sleeved on the outer circumference of the air duct 3. The end of the fixing member 4 is fixedly connected to the inner wall of the fan frame of the range hood. It can be bolted or welded. The fixing member 4 is used to fix the part of the air duct 3 close to the impeller, thereby preventing the air duct 3 from being drawn into the impeller under the suction of the negative pressure zone, thereby causing the impeller to stop and the range hood to be damaged, thereby improving the safety of the range hood.

[0060] In this embodiment, a power board 23 parallel to the upper cover 200 is provided in the inner cavity of the power box. The power board 23 is also arranged parallel to the lower cover 201. There is a certain distance between the power board 23 and the upper cover 200 along the height direction of the power box 2. There is also a certain distance between the power board 23 and the lower cover 201 along the height direction of the power box 2. By arranging in this way, when air with lower temperature is drawn into the power box 2 through the air duct 3, the air can fill the lower surface of the upper surface of the power board 23, so as to cool the power board 23 in all directions.

[0061] In addition, there are multiple air inlets 21 , each of which is a circular hole and is spaced apart along the extension direction of the power board 23 .

[0062] Specifically, the power board 23 is arranged parallel to the upper cover 200, and the air inlet 21 is arranged perpendicular to the upper cover 200 and passes through the upper cover 200. By arranging the air inlet 21 perpendicular to the upper cover 200, the air can be directly vertically directed to the power board 23 when entering the power box 2, and the multiple air inlets 21 are arranged at intervals, so that the air with lower temperature can be blown to various positions in the power box 2 and different positions of the power board 23 when entering the power box 2, so as to achieve comprehensive cooling of the power board 23 and other electronic components in the power box 2, and avoid the existence of cooling dead corners.

[0063] In this embodiment, the distance between the power board 23 and the lower cover 201 along the height direction of the power box 2 is h, that is, the distance between the air outlet 22 and the bottom of the power board 23 is h, and h satisfies a value greater than or equal to the first preset value and less than or equal to the second preset value; wherein the first preset value is The second preset value is m i and n i is the correction coefficient, i=1,2, correction coefficient m i The value range is 5≤m i ≤15, correction factor ni The value range is 1≤n i ≤10, and m2=Ln1, n2=Ln1, the value range of L is 1.5≤L≤3, the area of ​​the air outlet 22 is S2, the area of ​​the power board 23 is S3, the perimeter of the power board 23 is C3, the cross-sectional area of ​​the power box 2 parallel to the power board 23 is S4, the height of the power box 2 is H, and this embodiment is described by taking the value range of the power box 2 height as 50≤H≤200 as an example. The proportional relationship between the height h between the power board 23 and the air outlet 22 and the height H of the power box 2 is The above formula is used to calculate the value range of h and preset the value range of H. The specific calculation method is to take the maximum value in max and the minimum value in min. In addition, it should be noted that the larger the ratio of Q1 / Q, the larger the value of the correction coefficient. This is the existing technology and will not be elaborated on here. Among them, taking the air outlet 22 as a circular hole as an example, S2 is the area of ​​the circular hole, taking the power board 23 as a rectangular plate as an example, S3 is the area of ​​the rectangular plate, C3 is the perimeter of the rectangular plate, and because the power board 23 is arranged parallel to the upper cover 200, S4 is the area of ​​the upper cover 200 of the power box 2. The area of ​​the air outlet 22 is S2, the area of ​​the power board 23 is S3, the perimeter of the power board 23 is C3, and the cross-sectional area of ​​the power box 2 parallel to the power board 23 is S4. Other data are substituted into the calculation formula and the value range of h is calculated. Since there is enough space between the power board 23 and the air outlet 22, the lower temperature air is mixed with the heat on the power board 23 and flows from the bottom of the power board 23, that is, between the power board 23 and the air outlet 22, and finally flows into the air outlet 22. As a result, when the air with lower temperature enters the power box 2, it can fully take away the heat from the upper and lower surfaces of the power board 23 when it enters the air between the power board 23 and the air outlet 22 and enters the air duct 3. The actual range of h is calculated by the formula. Within this range, the height of h can ensure that sufficient air with lower temperature enters the power box 2 and effectively cools the power board 23. At the same time, the height of h within this range can also ensure that the air flow entering the air duct 3 has little effect on the flow of the fan 1, thereby achieving effective cooling of the power board 23 and ensuring that the flow entering the air duct 3 meets the ratio range of Q1 and Q when flowing into the air duct 3. The ability of the fan 1 to attract air mixed with oil smoke will not be significantly weakened, thereby reducing the influence on the suction force of the range hood's air inlet to attract oil smoke.

[0064] Furthermore, in this embodiment, the average wind speed between the power board 23 and the air inlet 21 is C4, and the value of C4 must be greater than or equal to 1m / s. Specifically, the calculation formula of C4 is: By limiting the size of h and the ratio of h to H, the average wind speed between the power board 23 and the air inlet 21 is limited, thereby restricting the air flow entering the power box 2. By limiting the air flow entering the power box 2, the power board 23 can be effectively cooled while avoiding the influence of the suction force of the fan 1 itself on the air mixed with oil smoke.

[0065] In this embodiment, the area of ​​the air outlet 22 is greater than or equal to the area of ​​the outlet 31 of the air duct 3 and less than or equal to min(0.3S3, 2S1). Specifically, when the air flow entering the power box 2 flows into the air outlet 22, the air flow entering the air duct 3 is determined by the area of ​​the air outlet 22. The area of ​​the air outlet 22 is the air circulation area of ​​the air inlet of the air duct 3, wherein the area of ​​the outlet 31 of the air duct 3 is S1. By limiting the range of the area of ​​the air outlet 22 and the area of ​​the outlet 31 of the air duct 3, so that the air that takes away the temperature of the upper and lower surfaces of the power board 23 flows into the air duct 3 from the air outlet 22 and flows out from the outlet 31 of the air duct 3, the resistance to air flow caused by the bending of the air duct 3 in the range hood will not affect the cooling of the power board 23. The circulation area of ​​sufficient air with lower temperature is guaranteed when it enters the power box 2 and flows into the air duct 3 from the air outlet 22 and finally flows out from the outlet 31, thereby ensuring effective cooling of the power board 23.

[0066] In this embodiment, the sum of the areas of the multiple air inlets 21 is S5, and 0.1S4≤S5≤0.5S4. Specifically, the cross-sectional area of ​​the power box 2 parallel to the power board 23 is S4. The sum of the areas of the multiple air inlets 21 determines the air flow rate entering the power box 2. In order to ensure that the power board 23 is fully cooled, the sum of the areas of the multiple air inlets 21 is also related to the cross-sectional area of ​​the power box 2 and the power board 23. The value range of S5 is limited according to S4 to further improve the accuracy of the air flow rate entering the power box 2 and used to cool the power board 23. While satisfying the ratio range of Q1 and Q, the air flow rate entering the power box 2 is optimized, so that the air flow rate drawn through the power box 2 and the air duct 3 to cool the power board 23 further reduces the influence of the air flow rate sucked into the air inlet of the range hood.

[0067] like Figure 4As shown, the impeller of the fan 1 is arranged horizontally and located in the middle area of ​​the range hood volute. The outlet 31 of the air duct 3 faces the impeller. In other words, the air flowing out of the outlet 31, mixed with the high temperatures of the upper and lower surfaces of the power board 23, enters the range hood's exhaust duct through the impeller and is ultimately discharged from the kitchen through the exhaust duct. Positioning the outlet 31 toward the impeller reduces resistance to air flowing out of the outlet 31 and into the exhaust duct, thereby improving the cooling efficiency of the power board 23. Furthermore, the axial direction of the outlet 31 of the air duct 3 is arranged parallel to the axial direction of the impeller. This further improves the ease with which air can flow out of the outlet 31 of the air duct 3. Air flows out of the outlet 31 in a straight line without being drawn in by the impeller and causing it to tilt horizontally. This avoids air flow obstruction due to the different directions of the outlet 31, which could affect the cooling efficiency of the power board 23.

[0068] In this embodiment, the volute of the range hood is taken as an example along the vertical direction, and is divided into four quadrants with the axis of the impeller as the center, wherein the positive direction of the Y axis is from the axis of the impeller in the vertical direction upward, and the positive direction of the X axis is from the axis of the impeller in the horizontal direction to the right. Due to the structural characteristics of the fan 1 itself, the air flow in the first quadrant is smaller than the air flow in other second quadrants, third quadrants or fourth quadrants. By setting the outlet 31 in the first quadrant, on the one hand, the air flowing out of the outlet 31 supplements the air flow in the first quadrant, so that the air flow in each quadrant is more uniform. On the other hand, since the air flow in the first quadrant is smaller, the flow of oil smoke in the first quadrant when the range hood absorbs oil smoke is smaller, thereby reducing the chance of the air duct 3 coming into contact with oil stains, and preventing oil smoke from mixing into the air duct 3 and finally flowing into the power box 2 to contaminate electronic components such as the power board 23.

[0069] Furthermore, the line connecting the center of the outlet 31 and the axis of the impeller forms an angle with the Y axis, which is α. The actual value range of α is 0° to 90°, and preferably, α is 30° to 60°. The distance between the center of the outlet 31 and the axis of the impeller is Z, the radius of the impeller is R2, Z / R2=0.5~0.9, S1=(0.01~0.08)πR2 2 .

[0070] In this embodiment, the range hood also includes a filtering mechanism (not shown in the figure), which is arranged at the air inlet 21. The filtering mechanism has the same shape as the air inlet 21 and is embedded in the air inlet 21. The filtering mechanism filters the air entering the power box 2 to prevent air mixed with oil smoke in the kitchen from entering the power box 2, thereby preventing the oil smoke from contaminating the power board 23 and other electronic components inside the power box 2, thereby ensuring the cleanliness of the interior of the power box 2 and the service life of the range hood.

[0071] In another implementation of this embodiment, the filtering mechanism is also arranged at the air outlet 22. Arranging the filtering mechanism at the air outlet 22 can, on the one hand, filter the air entering the power box 2 from near the impeller, and prevent the air with oil smoke from entering the power box 2 and contaminating the power board 23. On the other hand, the filtering mechanism can also purify the air flowing through the inside of the air duct 3 again, so that the air in the negative pressure zone flowing from the air outlet 22 to the impeller is not mixed with oil smoke, thereby allowing the impeller to remain clean and improving the service life of the impeller.

[0072] Among them, the filtering mechanism is filter cotton, which has low cost and is easy to replace, greatly improving the filtering efficiency of the filtering mechanism. Filter cotton is a structure used to filter air in the existing technology and will not be described in detail here.

[0073] In other implementations of this embodiment, the filtering mechanism can also be made of other materials for filtering oil smoke in the air, which can also filter the oil smoke in the air to prevent the oil smoke from contaminating the internal structure of the power box 2. This is existing technology and will not be listed here one by one.

[0074] In this embodiment, the range hood also includes a main control board (not shown in the figure), a solenoid valve 5 and a temperature sensor (not shown in the figure). The temperature sensor and the solenoid valve 5 are electrically connected to the main control board respectively. The solenoid valve 5 is arranged at the air outlet 22 and is used to drive the valve plate of the solenoid valve 5 to open or close the air outlet 22. The temperature sensor is arranged inside the power box 2 and is used to detect the temperature rise of the power board 23. When the impeller rotates, its temperature rise is not obvious. At this time, there is no need to open the air outlet 22 through the solenoid valve 5, that is, the power board 23 does not need to be cooled at this time. When the air outlet 22 is in the closed state, the air duct 3 will not draw air to cool the internal structure of the power box 2. In this embodiment, when the temperature rise of the temperature sensor is preset to no more than 60K, the solenoid valve 5 always keeps the air outlet 22 closed. The operation of the power box 2 and the power board 23 under this temperature rise has little effect on the working efficiency and service life of the range hood, which can even be ignored. Furthermore, in this embodiment, two temperature rise ranges of 60K-80K and greater than or equal to 80K are preset. When the temperature rise of the power board 23 is detected by the temperature sensor and reaches 60K-80K, the temperature sensor transmits a signal to the main control board, and the main control board turns on the solenoid valve 5. The solenoid valve 5 opens half of the flow area of ​​the air outlet 22 and cools the power board 23. Under this temperature rise, the half-open air outlet 22 can meet the cooling demand of the power board 23 and has little effect on the flow suction during the operation of the range hood. When the temperature rise is reached, the temperature rise data of the power board 23 is detected by the temperature sensor every one minute. When the temperature rise is reached, the temperature rise data of the power board 23 is detected by the temperature sensor every one minute. When the temperature rises to be greater than or equal to 80K, the temperature sensor transmits a signal to the main control board, and the main control board turns on the solenoid valve 5. At this time, the solenoid valve 5 fully opens the flow area of ​​the air outlet 22, that is, the air outlet 22 is fully open, so as to meet the cooling demand of the power board 23. Cooling the electronic components inside the power box 2 and the power board 23 in the above manner can reduce the flow impact of the range hood on the exhaust channel of the corresponding stove during use of the range hood, and can reduce the energy consumption of the range hood during operation, balance the working efficiency of the range hood and the effective flow efficiency of the airflow of the range hood, and improve the user experience.

[0075] This embodiment also provides a method for controlling the size of a range hood, which is implemented using the above-mentioned range hood and specifically includes the following steps:

[0076] S1. Set the power box 2 horizontally and the power board 23 horizontally inside the power box 2. Set the vertical distance between the air outlet 22 of the power box 2 and the power board 23 to h, where h satisfies the requirement of being greater than or equal to and less than or equal to

[0077] S2. Set the area of ​​the outlet 31 of the air duct 3 to S1, and set the area of ​​the air outlet 22 and the area of ​​the outlet 31 of the air duct 3 to satisfy S1≤S2≤min(0.3S3, 2S1);

[0078] S3, set the sum of the areas of the air inlets 21 to S5, and satisfy 0.1S4≤S5≤0.5S4;

[0079] The area of ​​the power board is S3, and the cross-sectional area of ​​the power box parallel to the power board is S4.

[0080] Specifically, by limiting the actual range of h, so that the distance between the power board 23 and the air outlet 22 is limited, the air with lower temperature can take away the heat at the bottom of the power board 23 when entering the power box 2, thereby achieving comprehensive cooling of the power board 23. Within this actual range, the air can flow smoothly into the air outlet 22 without affecting the flow of the fan 1, thereby ensuring the normal absorption function of the fan 1 for the air mixed with oil smoke. Furthermore, by limiting the area of ​​the outlet 31 of the air duct 3 and the area of ​​the air outlet 22, the outlet 31 of the air duct 3 and the air outlet 22 are The area of ​​the opening 22 is maintained within a preset range, which enables the air to be discharged smoothly from the air duct 3 without obstruction, thereby avoiding reducing the heat dissipation efficiency of the power board 23; in addition, by limiting the area of ​​the air inlet 21 and the area parallel to the power box 2 and the power board 23, the actual air flow entering the power box 2 is guaranteed. Within this range, the flow entering the power box 2 can meet the ratio of Q1 to Q, that is, it effectively cools the power board 23 without affecting the flow of the fan 1, thereby ensuring the normal absorption function of the fan 1 for air mixed with oil smoke.

[0081] In addition, in this embodiment, there is a proportional relationship between the distance between the edge of the power board 23 and the inner wall of the power box 2 in the horizontal direction and the distance between the power board 23 and the air outlet 22 in the vertical direction. The specific calculation formula is: The distance between the edge of the power board 23 and the inner wall of the power box 2 in the horizontal direction satisfies The value range of h is obtained by calculating the actual value range of h and substituting it into the formula to obtain the preset range, so that the horizontal distance between the edge of the power board 23 and the inner wall of the power box 2 is within the preset range. The values ​​within the preset range meet the ratio range of Q1 and Q and can ensure that the air flows smoothly from the air inlet 21 to the air outlet 22, avoiding the power board 23 from forming resistance inside the power box 2 to reduce the air flow entering the air outlet 22.

[0082] Furthermore, the distance between the power board 23 and the air outlet 22 in the vertical direction and the size of the air outlet 22 need to meet another preset range, and the calculation formula of the other preset range is: Similar to the above formula, by substituting the actual value range of h to obtain another preset range, the size of the air outlet 22 and the distance between the power board 23 and the air outlet 22 in the vertical direction are set to meet the preset range, so that the air flow entering the air outlet 22 meets the cooling requirements of the power board 23 and meets the ratio range of Q1 to Q.

[0083] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A range hood comprising a fan and a power supply box, characterized in that: The inner cavity of the power box is connected to the area where the impeller of the fan is located through an air duct. The maximum flow rate of the fan is Q, and the maximum air intake volume that the air duct can deliver is Q1, which must satisfy the ratio of Q1 / Q not greater than 0.

1. The upper cover of the power box is provided with an air inlet, and a power board parallel to the upper cover of the power box is provided in the inner cavity of the power box. The average wind speed between the power board and the air inlet is C4, which must satisfy the value of C4 greater than or equal to 1; in, The cross-sectional area of ​​the power box parallel to the power board is S4.

2. The range hood according to claim 1, wherein: The ratio of Q1 / Q is less than 0.1 and greater than 0.

05.

3. The range hood according to claim 1, wherein: The lower cover plate of the power box is provided with an air outlet, and one end of the air duct is connected to the air outlet.

4. The range hood according to claim 3, wherein: There are multiple air inlets, and the multiple air inlets are arranged at intervals along the extension direction of the power board.

5. The range hood according to claim 4, wherein: The area of ​​the air outlet is greater than or equal to the outlet area of ​​the air duct and less than or equal to min(0.3S3, 2S1); Wherein, the outlet area of ​​the air duct is S1.

6. The range hood according to claim 4, wherein: The sum of the areas of the plurality of air inlets is S5, and 0.1S4≤S5≤0.5S4.

7. The range hood according to claim 1, wherein: The outlet direction of the air duct is consistent with the air inlet direction of the fan, and the axial direction of the outlet of the air duct is arranged parallel to the axial direction of the impeller.

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