CN100436949C - Whirl entraining type cooking fume exhauster - Google Patents

Abstract

A swirl drawing oil exhaust ventilator features in the stacked arrangement of two wind machine and ring swirl slot, two wind blower pipe tangentially cutting the ring swirl slot with an included angle of 60-180, outside barrel connected to the radius change connecting pipe, slot at their juncture and outside slanted slot, a ring oil stop slot, radius change minimum diameter being 0.9 to 1.3 times of the up opening diameter of the connecting pipe, length being 1 to 2 times of the minimum diameter, radius connecting pipe installed with dual sealing rolling door at the joint position of the smoke exhaust chimney. It adopts reasonable assembly method, linear structure and ball smoke hood, free from big power wind blower to achieve better bump effect, getting rid of may setbacks of existing electric smoke extraction machine with high efficiency, energy saving, environment protective and easy cleaning.

Description

A swirling volume range hood

Technical field:

The invention belongs to the technical field of pneumatic dust removal devices, and in particular relates to an electric range hood for removing fume gas, in particular to a swirl-type range hood.

Background technique:

Electric range hoods have been in the ranks of household appliances for half a century, and they are indispensable fume purifiers in the kitchen environment. However, the existing electric range hoods on the market almost all set the blower fan in the pipeline at the junction of the smoke collection hood and the smoke exhaust pipe, and use the rotation of the fan impeller to generate negative pressure to suck the oil fume. contact, causing the blades of the fan to stick to oil, destroying the balance of the blades, making it difficult to clean, reducing the performance of the fan, increasing the noise, and shortening the life of the range hood; and because the exhaust pipe is blocked by the fan, the airflow is not smooth, The efficiency of sucking and exhausting oil fume is very low. Manufacturers often increase the input power of the fan to make up for it. Range hood" national standard and "Residence Design Code GB50096-1999" requirements. If this original structural state does not change, the existing electric range hoods have defects such as low efficiency of sucking and exhausting smoke, high energy consumption, high noise, high pollution, difficult cleaning, and short life.

The "swirl type range hood" proposed in Chinese Patent No. 01201987.9, although the configured fan is removed from the smoke exhaust pipe, and the swirling airflow is used to form negative pressure to entrain the oil fume, but the swirl device and the swirl tube of the swirl generating device 1. The air intake cylinder is set together with a cylinder, and the upper port of the air intake cylinder passes through the cyclone and is placed in the cyclone and the cyclone cylinder, so that the low pressure area generated by the swirl cannot be effectively controlled, and the A better suction effect cannot be achieved; the gradually expanding exhaust air duct it adopts is not suitable for installation and use in a kitchen environment. This range hood has not been seen in the market so far.

Chinese Patent Application No. 200510065824.8 proposes the "Double Swirling Three-Hole Range Hood", in which the inner cylinder and the outer cylinder of the swirling fume extraction device adopt a streamlined busbar and use two low-power fans to supply air To the annular swirling groove, the upward swirling airflow forms a concentrated negative pressure area on the upper part of the inner cylinder, and the obtained swirling fume entrainment device can generate strong suction capacity. However, since the range hood adopts two fans symmetrically placed on both sides of the swirl fume extraction device, the "one" arrangement of the two fans and the swirl fume suction device takes up a large horizontal space, which is not necessary. It is convenient for installation and use, but the relatively narrow vertical space makes the effective range of oil fume suction insufficient, and the oil fume diffused in the longitudinal direction cannot be fully sucked, which affects the suction effect; because the oil intercepting groove is set at the bottom of the swirl sleeve, the oil dirt is smoothly The pipe wall of the smoke exhaust pipe flows downward and sticks to the pipe wall of the outer tube, which increases the trouble of cleaning. The experiment found that the airflow sent by the fan rotates at high speed in the annular swirl groove, and the outer tube wall is continuously washed down by the high-speed rotating airflow. Originally, this part is not easy to stick to oil, so the annular oil intercepting groove should not be installed on the swirl sleeve. the bottom of the outer tube to avoid sticking to the wall of the outer cylinder caused by the oil dirt flowing down; the existing range hood needs to automatically close the check valve when it is not working, so as to avoid the shared flue or the outdoor airflow along the exhaust pipe. If the range hood is connected to the room, since the flue of the range hood is unblocked, but there is no anti-backflow device installed, it is more likely to cause cross-gas; because the range hood uses rotating airflow to suck the range hood, the airflow is still in the process of exhausting. Rotate in the duct, then the existing check valve installed in the smoke exhaust pipe will affect the rotational flow of the airflow when the range hood works, so the existing check valve is not suitable for the swirling smoke extraction device.

The smoke collecting hoods of the existing electric range hoods on the market generally have deep cover type, shallow cover type and European ultra-thin type, and are usually installed at 70-80 cm above the stove, also known as high installation. The deep hood type has a better effect of collecting oily fume, but it is easy to block the sight and meet the head, and has poor practicability. Although the shallow hood type and the European ultra-thin type do not block the line of sight and meet the head, the effect of gathering oily fume is poor. Manufacturers sometimes change the fume collecting hood For example, the range hood model CXW-219-D69 adopts an arched fume collection hood based on the European style, and the range hood suction port of model CXW-169-JX01/J2M/19M is installed near the low position of the cooktop and installed on the upper end of the panel. A movable baffle acts as a fume collecting hood to avoid blocking the sight line and not touching each other. However, because these fume collecting hoods cannot take into account the practicality and the effect of gathering oily fume at the same time, the overall effect is not very satisfactory.

Invention content:

The present invention proposes a swirl suction range hood, which adopts a more reasonable assembly method, a streamlined structural design and a spherical smoke collection hood to overcome the above-mentioned many disadvantages of the existing electric range hood and achieve high efficiency and energy saving , environmental protection, easy to clean purposes.

The whirlpool range hood of the present invention comprises: a trumpet-shaped inner cylinder concentric with the central axis protrudes into the outer cylinder to form an annular swirl trough with a "V" shape in cross section and a sealed bottom. The generatrix of the trumpet-shaped inner cylinder is hyperbolic, the diameter of the lower opening is 1.1 to 1.5 times the diameter of the upper opening, and the height is 0.3 to 0.7 times the diameter of the upper opening. The bus bar of the outer cylinder is parabolic, and the upper opening The diameter is 1 to 1.5 times the diameter of the lower opening, and the height of the outer cylinder is 1 to 1.2 times the height of the trumpet-shaped inner cylinder; two fans are located outside the annular swirl groove, and the air supply pipes of the fans communicate with the annular swirl groove tangentially , the swirling oil fume suction device thus formed is installed above the fume collecting hood, and the groove bottom of the annular swirl groove is sealed and connected with the edge of the smoking port of the fume collecting hood; the air inlet of the fan faces the stove and the fume collecting The smoke port of the hood is connected, and the feature is that: the two fans are arranged in the shape of "product" with the annular swirl groove, the air supply pipes of the two fans are connected to the annular swirl groove in the same direction and tangentially, and the two air supply pipes are connected to the annular swirl groove. The angle between them is 60 to 180 degrees; the upper edge of the outer cylinder of the swirling oil fume extraction device is connected with the lower edge of the variable diameter connecting pipe, and a gap is left at the connection between the two to open an "eight" shape that is inclined outward. channel, and an annular oil cut-off groove is set around the outer ring of the channel; the minimum diameter of the variable-diameter connecting pipe is 0.9 to 1.3 times the diameter of the upper mouth of the horn-shaped inner cylinder, and the length of the variable-diameter connecting pipe is its minimum diameter. 1 to 2 times; double-sided sealed rolling shutter doors are installed at the joint between the upper edge of the variable diameter connecting pipe and the smoke exhaust pipe. The double-sided sealed rolling shutter door adopts a square double-layer structure, and the rolling shutter is sandwiched between two sealing rings. Or manually open the device and utilize the coiled spring return to close.

The busbar of the variable-diameter connecting pipe is streamlined, and can adopt a shrinking pipe, a round pipe, or a Ventley pipe that shrinks first and then expands, and the Ventley pipe is preferred.

The air supply duct of the fan can be a tangential pipe, a helical pipe, an arc pipe or an involute pipe.

The fume collecting hood is preferably spherical, and can be installed at a high position or at an inclined low position, preferably at an inclined low position.

The swirling oil fume extraction device can be installed vertically or obliquely on the fume collecting hood.

The smoke exhaust pipe can be a straight pipe or a curved pipe, and a larger curvature radius is preferred when the pipe is a curved pipe.

Compared with the prior art, the swirling volume range hood of the present invention has the following prominent substantive features and significant progress:

1. The present invention enters into the annular swirl tank in the same direction and tangentially because the air supply ducts of the two blowers are used, the angle between the two air supply ducts is 60 to 180 degrees, and the two fans and the annular swirl tank are in the shape of " This more reasonable assembly method can make the range hood achieve high efficiency, energy saving and low noise; when the range hood is working, the airflow exhausted by the two fans to suck the oil fume flows in the same direction in the annular swirl groove , the energy of the swirling flow is increased, so that the swirl fume extraction device forms a concentrated low-pressure area on the upper part of the inner cylinder, thus generating sufficient suction to re-entrain the fume, and at the same time, the swirl fume extraction device eliminates the interaction between the parallel use of fans interference; due to the sealing connection between the bottom of the annular swirling trough and the edge of the smoking port of the smoke collecting hood, the air inlet of the two fans faces the stove and is connected to the smoking port of the collecting smoke hood. In addition to the swirling fume entrainment produced by the range fume device, the fan also directly participates in the suction of fume at the same time, which is equivalent to the addition of a swirl fume device working at the same time without increasing the energy consumption of the original fan. The scope and effect of extracting oil fume are expanded, the original function of the fan is not reduced, the energy consumption is not increased, and the energy is reused, and the extraction rate of oil fume is greatly improved; especially the two fans and the annular swirl tank are adopted in a " Arranged in the shape of "品", the angle between the two air supply ducts is between 60 and 180 degrees, so that the rising oil fume can face the smoking port, expanding the range of oil fume suction, and achieving a better suction effect. The total power of the next two blowers can be greatly reduced compared with the blower blower power of the existing electric range hood, the power of the blower blowers is reduced, and the noise is also reduced simultaneously. Since most of the fume gas enters from the smoking port of the swirling fume extraction device, compared with the existing electric range hood, the fume gas all flows through the fan, and the amount of oil sticking to the fan is greatly reduced, thereby prolonging the life of the fan. life.

2. Since the present invention adopts the connection between the upper edge of the outer cylinder of the swirling oil fume extraction device and the lower edge of the variable-diameter connecting pipe, a gap is left at the connection between the two to open a "eight"-shaped groove inclined outwards, and in the groove An annular oil cut-off groove is arranged around the outer ring of the duct, which can make the range hood highly efficient and easy to clean; The swirling airflow in the swirling trough forms a low-pressure area in the pipe to suck oil fumes; especially when the Ventley tube is used, because the Ventley pipe shrinks first and then expands, the circumferential velocity of the airflow swirling through the annular swirling trough It will be increased in the contraction section of the Ventley tube, and the annular velocity will decrease in the expansion section. According to the theory of fluid mechanics, the greater the annular velocity of the swirling flow, the lower the pressure generated in the center of the swirling flow. Therefore, a low-pressure area with relatively concentrated pressure can be formed on the upper part of the inner cylinder, which increases the suction of the swirling oil fume extraction device; both theory and experiments show that compared with the reducer or round tube, when using the Ventley tube, The speed of the rising airflow at the smoking opening of the fume collecting hood increases, which is equivalent to increasing the effect of sucking oil fume of the range hood. The size of the variable-diameter connecting pipe must match that of the swirling fume extraction device, and its minimum diameter is 0.9 to 1.3 times the diameter of the upper opening of the horn-shaped inner cylinder. If the diameter of the variable-diameter connecting pipe is too small, it will prevent the discharge of the airflow , a backflow is formed at the smoking port of the fume collecting hood, which fails to achieve the purpose of sucking oil fume, and the negative pressure in the low-pressure area formed on the upper part of the inner cylinder with too large diameter is not conducive to sucking oil fume; The external smoke exhaust pipe occupies a limited volume inside the range hood shell, so its length should not be too large, preferably 1 to 2 times its minimum diameter. Leave a gap at the connection between the upper edge of the outer cylinder of the swirling oil fume extraction device and the lower edge of the variable diameter connecting pipe to open a "eight"-shaped groove inclined outwards, and set an annular oil cut-off groove around the outer ring of the groove. On the one hand, due to the high-speed rotation of the airflow sent by the fan in the annular swirl tank, the outer tube wall of the swirl fume extraction device is continuously washed by the high-speed rotating airflow without sticking oil. The grease condensed in the oil fume is thrown to the inner wall of the smoke exhaust pipe and the variable-diameter connecting pipe by the centrifugal force generated by the swirling flow, and the grease deposited on the inner wall of the smoke exhaust pipe and the variable-diameter connecting pipe will flow downward, so the inclined channel can be completely The oil dirt is intercepted and collected in the annular oil intercepting groove, which can reduce the range of oil dirt sticking, and the outer tube wall no longer needs to be cleaned; the oil dirt intercepted by the annular swirling groove can be connected to the oil storage box through a pipeline for easy removal. In addition, because most of the oily dirt is thrown to the pipe wall by the centrifugal force generated by the swirling flow and cut off, the pipe in the kitchen becomes an efficient centrifugal separation device, which greatly reduces the concentration of oily fumes discharged outdoors and meets environmental protection standards.

3. Since the double-sided sealed rolling door installed at the joint between the upper edge of the variable-diameter connecting pipe and the smoke exhaust pipe adopts a square double-layer structure, two sealing rings are set to clamp the rolling shutter in the middle, and an electric or manual opening device is provided. , use the coil spring to reset and close, which can prevent the shared flue or the outdoor airflow from entering the room along the exhaust pipe when the range hood is not working, and does not affect the movement of the rotating air flow when the range hood is working; and because the range hood uses The swirling airflow forms a low-pressure core to entrain the oil fume, and the airflow rotates in the flue during the discharge process. The existing check valve installed in the exhaust pipe will affect the rotating flow of the airflow when the range hood is working. Therefore, the existing check valve It is not applicable to the swirling volume range hood of the present invention.

4. The present invention preferably adopts a spherical fume collecting hood. When it is installed at a normal high position, it can have the efficiency of a deep cover type fume collecting hood to gather oil fume and also have the gorgeous appearance of a European machine; Block the line of sight, do not take up space and do not touch the head. The low-position smoking port can lead and suck the oil fume before it spreads around, while the high-position smoking port continues to suck the rising oil fume to achieve the purpose of purifying the oil fume, thereby avoiding inhalation by the human body. This is also conducive to installing the swirl oil fume extraction device obliquely on the fume collection hood, so that the radius of curvature of the elbow pipe leading to the outdoor smoke exhaust pipe is increased, thereby improving the efficiency of both smoke exhaust and swirl oil fume extraction ;Because the swirling air flow passes through the elbow, part of the air flow no longer rotates, but flows straight along the direction of the pipe and is discharged. At this time, compared with the straight pipe, the suction force of the swirling flow entraining oil fume will decrease, so when configuring the elbow The larger the radius of curvature, the higher the suction of oil fume entrained by the swirling flow, and the straight pipe is the highest; if the installation conditions can be met, it is better to use a curved pipe with a larger radius of curvature as the smoke exhaust pipe.

In a word, the present invention can realize high efficiency, energy saving, environmental protection and easy cleaning due to the adoption of a more reasonable configuration and assembly method, as well as the streamlined structural design and the spherical fume collecting hood. choose.

Description of drawings:

Fig. 1 is a schematic view of the longitudinal section of the swirling flow range hood in Embodiment 1.

Fig. 2 is a schematic diagram of the cross-sectional structure along line A-A of Fig. 1 .

Fig. 3 is a schematic diagram of the B-B sectional structure of Fig. 2 .

Fig. 4 is a schematic diagram of the longitudinal section structure of the swirl-type range hood in Embodiment 2.

Fig. 5 is a schematic diagram of the cross-sectional structure along line C-C of Fig. 4 .

FIG. 6 is a schematic diagram of the D-D sectional structure of FIG. 5 .

Detailed ways:

Embodiments of the present invention are now described in conjunction with the accompanying drawings.

Example 1:

This embodiment is an implementation manner of a swirling flow range hood. Fig. 1 is a schematic diagram of its longitudinal sectional structure, Fig. 2 is a schematic diagram of the A-A sectional structure of Fig. 1 , and Fig. 3 is a schematic diagram of the B-B sectional structure of Fig. 2 .

As shown in Fig. 1, Fig. 2 and Fig. 3: the swirling oil fume suction device adopted in this embodiment is a sleeve-shaped device, that is, the trumpet-shaped inner cylinder 1 with the central axis extends into the outer cylinder 4, An annular swirl groove 6 with a "v" shape in cross section and a sealed groove bottom is formed. The generatrix of the inner tube 1 of the horn is hyperbolic, the diameter of the lower opening is 1.25 times the diameter of the upper opening 3, and the height is 1.25 times that of the upper opening 3. 0.5 times the diameter of the mouth 3, the generatrix of the outer cylinder 4 is parabolic, the diameter of the upper opening is 1.2 times the diameter of the lower opening, and the height is 1.1 times the height of the trumpet-shaped inner cylinder. The air supply duct 7 of the fan is installed in the hole. What adopted in this embodiment is a tangential pipe. In this embodiment, two power fans 9 with a power of 48 watts are positioned on the outside of the annular swirl groove 6, forming a shape with the annular swirl groove 6. Arranged in the shape of "product", the air supply pipes 7 of the two fans 9 enter the annular swirl groove 6 in the same direction and tangentially, and the angle between the two air supply pipes 7 is 60 to 180 degrees; the formed swirl entrainment The oil fume device is installed above the spherical fume collecting hood 11, and the groove bottom of the annular swirl groove 6 is sealedly connected with the edge of the smoking port 2 of the fume collecting hood 11, and the air inlet 10 of the fan faces the stove top and the fume collecting hood 11. The smoking port is connected, the spherical fume collecting hood 11 is installed at a usual high position, and the flat plate 15 is used to connect the spherical fume collecting hood 11 and the swirl smoke extraction device; the outer cylinder of the swirl smoke extraction device The upper edge of 4 is connected with the lower edge of the variable-diameter connecting pipe 8, and a gap is left at the connection between the two to open a "eight"-shaped groove inclined outward, and an annular oil intercepting groove 5 is arranged around the outer ring of the groove; The variable-diameter connecting pipe 8 adopted in the present embodiment is a Ventley tube, and its minimum diameter is equal to the diameter of the horn 1 upper port 3, and the length of the variable-diameter connecting pipe 8 is 1.3 times of its minimum diameter; A double-sided sealed rolling door 13 is installed at the joint between the upper edge of the connecting pipe 8 and the smoke exhaust pipe 14. In this embodiment, the double-sided sealed rolling door proposed by Chinese Patent No. 200420091566.1 is adopted. The double-sided sealed rolling door adopts a square double-layer structure. Set two sealing rings to clamp the roller blind in the middle, set up an electric or manual opening device, and use the curling spring to reset and close; the shell 12 is a platform for installing switches, oil storage boxes, lamps and other components.

During use, first open the double-sided sealed rolling shutter door 13, start the switch, and the soot gas sucked from the air inlet 10 of the fan by the two fans 9 is transported to the annular swirl groove 6 through the air supply duct 7 of the fan to flow in the same direction, increasing the The energy of the swirling flow, and the swirling fume extraction device eliminates the mutual interference of the parallel use of the fans 9, and the high-speed rotating airflow forms a concentrated low-pressure area on the upper part of the outlet 3 of the inner cylinder, thus generating sufficient suction, and the entrained Oil fume enters the streamlined trumpet-shaped inner cylinder 1 from the smoking port 2 , flows through the variable-diameter connecting pipe 8 from the outlet 3 of the inner cylinder, and is discharged from the exhaust pipe 14 . Owing to having taken the groove bottom of annular swirl groove 6 and the edge sealing connection of the smoking port 2 of smoke collecting hood 11, the air inlet 10 of two fans 9 faces the installation mode that the stove top is connected with the smoking port of collecting smoke hood 11, except In addition to the swirl fume extraction device produced by the swirl fume extraction device, the fan is also directly involved in the extraction of the fume, which is equivalent to adding a swirl fume extraction device to the original fan without increasing energy consumption. Working at the same time, the range and effect of extracting oil fume are expanded, the original function of the fan is not reduced, the energy consumption is not increased, and the energy is reused, and the oil fume extraction rate is greatly improved; especially due to the adoption of two fans 9 and the ring The swirl grooves 6 are arranged in the shape of "product", the air supply pipes 7 of the two fans 9 are connected to the annular swirl groove 6 in the same direction and tangentially, and the angle between the two air supply pipes 7 is between 60 and 180 degrees , can make the rising oily fume face the smoking port, thus expanding the range of oily fume suction, without using a high-power fan to achieve a better suction effect, the power of the fan is reduced, and the noise is also reduced at the same time.

Experiments have found that when the total power of the two blowers 9 is 96 watts (the power of each blower is 48 watts), the exhaust volume of the swirling oil fume suction device is greater than the sum of the exhaust volumes of the two blowers 9, and the rising oil fume gas is large. Part of it enters from the smoking port 2 of the swirling range hood, and a small part of the fume gas enters from the air inlet 10 of the fan. Far greater than the oil fume suction effect of the non-swirl entrainment of two fans with a total power of 96 watts, the present invention reduces energy consumption while achieving a high oil fume extraction rate. Another advantage of using low-power fans is that Also reduces the noise at the same time.

Since the variable-diameter connecting pipe 8 adopts the Ventley tube that shrinks first and then expands, the circumferential velocity of the airflow that swirls up through the annular swirl groove 6 will be increased in the contraction section of the Ventley tube, and in the circumferential direction of the expansion section. The speed drops again. According to the theory of fluid mechanics, it can be known that the greater the circumferential speed of the swirling flow, the lower the pressure generated at the center of the swirling flow. Therefore, a low-pressure area with relatively concentrated pressure can be formed on the upper part of the outlet 3 of the inner cylinder, so that The suction force of the swirling oil fume extraction device is increased; both theory and experiment show that, compared with the reducer or round pipe, when the Ventley pipe is used, the rising air velocity at the smoke mouth of the smoke collection hood 11 increases, which means It is equivalent to the effect of sucking oil fume of range hood to increase.

Leave a gap at the connection between the upper edge of the outer cylinder 4 of the swirling oil fume extraction device and the lower edge of the variable diameter connecting pipe 8 to open a "eight"-shaped groove inclined outwards, and set it around the outer ring of the groove The annular oil cut-off groove 5, on the one hand, because the airflow sent by the fan rotates at high speed in the annular swirl groove 6, the pipe wall of the outer cylinder 4 of the swirl oil fume suction device is continuously washed by the high-speed rotating airflow without sticking oil. On the other hand, when the oil scale condensed in the oil fume is thrown to the inner wall of the smoke exhaust pipe 14 and the inner wall of the variable diameter connecting pipe 8 by the centrifugal force generated by the swirling flow during the smoke exhaust process, the oil scale deposited on the inner wall of the smoke exhaust pipe 14 and the inner wall of the variable diameter connecting pipe 8 will be It will flow downward, so the inclined channel can completely intercept the oil dirt and collect it into the annular oil intercepting groove 5, which can reduce the range of oil dirt sticking, and the pipe wall of the outer cylinder 4 no longer needs to be cleaned; the oil dirt intercepted by the annular swirl groove 5 Can be piped to reservoir for easy removal. In addition, because most of the oily dirt is thrown to the pipe wall by the centrifugal force generated by the swirling flow and cut off, the pipe in the kitchen becomes an efficient centrifugal separation device, which greatly reduces the concentration of oily fumes discharged outdoors and meets environmental protection standards. Because the exhausted airflow is still rotating, the double-sided sealed rolling shutter door 13 is adopted in this embodiment, which adopts a square double-layer structure, and two sealing rings are set to sandwich the rolling shutter in the middle, and an electric or manual opening device is provided, and the curling spring is used to open the door. Reset and close, this structure is different from the current check valve installed in the smoke exhaust pipe, the current check valve installed in the smoke exhaust pipe is still located in the smoke exhaust pipe when it is opened, which will affect the working time of the range hood The movement of the swirling air flow leads to poor smoke exhaust, and when the double-sided sealed rolling door 13 is opened, the pipeline will be unobstructed without affecting the swirl movement. When it is closed, it can prevent the shared flue or outdoor airflow from entering the room along the exhaust pipe 14 .

Example 2:

This embodiment is another implementation of the swirling flow range hood. Fig. 4 is a schematic view of its longitudinal section structure, Fig. 5 is a schematic view of a C-C sectional structure of Fig. 4 , and Fig. 6 is a schematic view of a D-D sectional structure of Fig. 5 .

As shown in Fig. 4, Fig. 5 and Fig. 6: the structure and connection mode of the swirling oil fume suction device, the annular oil cut-off groove 5, and the double-sided sealed rolling door 13 adopted in this embodiment are the same as those in embodiment 1, and the difference The location is: the spherical smoke collecting hood 11 is installed in an inclined and low position, so that the smoke collecting hood 11 has a low smoking port 16 that is closer to the stove, and the corresponding smoking port 2 that is farther from the stove is a high smoking port. Under the air inlet 10 of the blower fan, a draft guide tube 17 is stretched out and connected to the low-position smoke opening 16 of the spherical smoke collecting hood 11 .

When in use, first open the double-sided sealed rolling shutter door 13, start the switch, and the blower fan 9 can lead the oil fume gas from the low smoking port 16 to suck the oil fume gas so that the generated oil fume gas cannot diffuse to the surroundings, and the rising part of the oil fume gas is then rolled by the swirling flow. The fume extraction device sucks so that it will not be absorbed by the body. Due to both the characteristics of Embodiment 1, the range hood of this embodiment has the advantages of large suction range, high extraction rate, low noise, and less pollution; The space does not touch each other, the low-position smoking port 16 can lead and suck the oil fume before it spreads around, while the high-position smoking port 2 continues to suck the rising oil fume to achieve the purpose of purifying the oil fume, thereby avoiding human inhalation; the smoke collecting hood 11 is tilted The low-level installation is also conducive to installing the swirling oil fume suction device obliquely on the fume collecting hood 11, so that the radius of curvature of the elbow of the smoke exhaust pipe 14 leading to the outside increases. It no longer rotates, but flows and discharges in a straight line along the direction of the pipe. Compared with straight pipes, the suction force of the curved pipe will reduce the suction of the swirl entrained oil fume; the experiment found that the larger the radius of curvature of the configured elbow pipe, the better the swirl entrained oil fume The higher the suction power, the higher the straight tube. In this embodiment, when the swirl oil fume extraction device is relatively close to the wall, the guide tube 17 can also be extended under the smoking port 2 of the swirl oil fume extraction device to connect to the low smoking port 16 of the spherical smoke collecting hood 12, At this time, the swirling oil fume suction device can lead and suck the oil fume from the low smoking port 16, and the rising oil fume gas is sucked through the air inlet 10 of the blower fan, thereby also achieving the same effect.

Claims (6)

1. A whirlpool range hood, comprising: a trumpet-shaped inner cylinder concentric with the central axis extends into the outer cylinder to form an annular swirl trough with a "V"-shaped cross-section and a sealed bottom. The busbar of the trumpet-shaped inner cylinder is hyperbolic, the diameter of the lower opening is 1.1 to 1.5 times the diameter of the upper opening, and the height is 0.3 to 0.7 times the diameter of the upper opening. The busbar of the outer cylinder is parabolic, and the upper opening The diameter is 1 to 1.5 times the diameter of the lower opening, and the height of the outer cylinder is 1 to 1.2 times the height of the trumpet-shaped inner cylinder; two fans are placed outside the annular swirl groove, and the air supply pipe of the fan is tangential to the annular swirl groove In the same way, the swirling oil fume suction device thus formed is installed above the fume collecting hood, and the bottom of the annular swirl groove is sealed and connected with the edge of the smoking port of the fume collecting hood; the air inlet of the fan faces the stove and the collecting fume The smoking port of the smoke hood is connected; it is characterized in that: the two fans are arranged in the shape of "product" with the annular swirl groove, the air supply pipes of the two fans are connected to the annular swirl groove in the same direction and tangentially, and the two air supply pipes The angle between them is 60 to 180 degrees; the upper edge of the outer cylinder of the swirling oil fume extraction device is connected with the lower edge of the variable diameter connecting pipe, and a gap is left at the connection between the two to open an "eight" shape and tilt outward channel, and an annular oil cut-off groove is set around the outer ring of the channel; the minimum diameter of the variable-diameter connecting pipe is 0.9 to 1.3 times the diameter of the upper opening of the horn-shaped inner cylinder, and the length of the variable-diameter connecting pipe is its minimum diameter 1 to 2 times of that; the upper edge of the variable diameter connecting pipe and the joint of the smoke exhaust pipe are installed with a double-sided sealed rolling shutter door. The double-sided sealed rolling shutter door adopts a square double-layer structure, and the rolling shutter is sandwiched between two sealing rings. Electric or manual opening mechanism, return closure with coiled spring. 2. The swirling flow range hood according to claim 1, characterized in that the busbar of the variable diameter connecting pipe is streamlined, and the variable diameter connecting pipe adopts a tapered tube, a round tube or a file that shrinks first and then expands. Turley pipe. 3. The whirlpool range hood according to claim 1, characterized in that the air supply duct of the fan is a tangential pipe, a spiral pipe, an arc pipe or an involute pipe. 4. The whirling flow range hood according to claim 1, characterized in that the fume collecting hood is spherical and installed in a high position or an inclined low position. 5. The swirl smoke extraction range hood according to claim 1, characterized in that the swirl smoke extraction device is installed vertically or obliquely on the smoke collection hood. 6. The whirling flow range hood according to claim 1, characterized in that the smoke exhaust pipe is a straight pipe or a bent pipe.

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