CN210399054U - Series double-fan type range hood - Google Patents
Series double-fan type range hood Download PDFInfo
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- CN210399054U CN210399054U CN201920717484.XU CN201920717484U CN210399054U CN 210399054 U CN210399054 U CN 210399054U CN 201920717484 U CN201920717484 U CN 201920717484U CN 210399054 U CN210399054 U CN 210399054U
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Abstract
A serial double-fan type range hood is characterized in that an air outlet of a primary fan is in fluid communication with an air inlet of a secondary fan, a first detection device arranged on the primary fan comprises a first temperature sensor and a first thermal anemoscope, a second detection device arranged on the secondary fan comprises a second temperature sensor, a second thermal anemoscope and a heating device, signal output ends of the first temperature sensor, the first thermal anemoscope, the second temperature sensor and the second thermal anemoscope are electrically connected with a signal input end of a controller, and a signal output end of the controller is electrically connected with the heating device and fan motor driving modules of the primary fan and the secondary fan. The series double-fan type range hood converts the wind speed ratio measured by the two thermal type anemometers into a flow ratio, the controller is combined with the two temperature sensors to adjust the rotating speeds of the primary fan and the secondary fan, and the flow of the primary fan and the flow of the secondary fan are in dynamic balance under different working conditions through a fluid temperature compensation program and a flow detection program.
Description
Technical Field
The utility model relates to a two fan type range hoods of series connection.
Background
Chinese cooking can produce a large amount of oil smoke, and in order to keep the kitchen environment clean and the health of human body, the range hood has become one of the indispensable equipment in modern family kitchen. However, the floors of modern houses are usually high, and the smoke exhaust ventilator is introduced into the common flue by residents on different floors of the same building to exhaust smoke, so that the backpressure of the common flue rises suddenly at the peak cooking time, and the smoke exhaust ventilator is difficult to exhaust smoke. The exhaust flow of the range hood in the use state mainly depends on the air pressure of a fan system of the range hood, and the larger the air pressure is, the larger the exhaust flow is. When the common household range hood is used, oil smoke needs to be discharged through resistance devices such as a smoke discharge pipe, a check valve and a smoke discharge channel, and due to the resistance devices, certain back pressure exists in the oil smoke at an oil smoke discharge port, and the exhaust flow of the range hood can be greatly influenced due to the existence of the back pressure. The air pressure of the fan system plays a positive role in the exhaust flow of the range hood, and the existence of back pressure plays a negative role in the exhaust flow of the range hood.
In order to overcome adverse effects caused by back pressure as far as possible, people have designed a range hood with two serially connected fans at present, so that the range hood with two serially connected fans increases the air pressure of a fan system by matching a primary fan and a secondary fan, so that the fan system can obtain larger exhaust flow even if larger back pressure exists in a use state, the rotating speed of the primary fan and the secondary fan does not need to be too high, the noise is smaller, and the requirement of efficient static suction of the range hood can be met. For example, patent No. 201410121288.8 (application publication No. CN104949174A) discloses a series double-fan type range hood, which includes a fan housing and a smoke collecting hood, wherein a primary fan and a secondary fan are arranged in the fan housing and are connected in series, and an air outlet of the primary fan is in fluid communication with an air inlet of the secondary fan. Although the static pressure of the whole range hood is improved by connecting two fans in series to overcome the adverse effect caused by back pressure, so that the smoke suction and exhaust effect is improved, the range hood with high-efficiency smoke suction and exhaust capacity is provided with the two fans connected in series, and the working conditions of the two fans are different. Because the operating mode of two fans is different, and the loss that flows is different promptly, even if use two the same fans, also can appear the condition that both flows are inequality. And can't carry out real-time supervision to the flow of two fans among the prior art, this just leads to establishing ties the fan and can't work according to the design value under different work condition, and it is big to appear the noise in the use, and the complete machine shakes the culinary art that etc. influences people and experiences. For example, when the output air volume of the primary fan greatly exceeds the intake air volume of the secondary fan, the secondary fan cannot discharge or convert the air volume in time, the secondary fan becomes the main resistance of the primary fan, the flow loss of the primary fan is aggravated, and the dynamic balance of the impeller of the secondary fan is damaged by the output air volume of the primary fan, so that the secondary fan shakes, the noise is aggravated, and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to above-mentioned prior art current situation, provide a main, inferior two-stage fan's flow is in dynamic balance state's series connection double fan type range hood under different work condition.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: this series connection double fan type range hood, including the fan frame with locate the collection petticoat pipe of fan frame bottom, fan frame internally mounted has the primary fan and the secondary fan of establishing ties each other, the air outlet of primary fan and the air intake fluid intercommunication of secondary fan, its characterized in that: install first detection device on the primary fan install second detection device on the secondary fan, first detection device includes first temperature sensor and first hot type anemoscope, second detection device includes second temperature sensor, second hot type anemoscope and heating device, still including the controller that is used for controlling heating device and primary fan and secondary fan rotational speed, the signal output part of first temperature sensor, first hot type anemoscope, second temperature sensor, second hot type anemoscope with the signal input part looks electricity of controller is connected, the signal output part and the heating device of controller and the fan motor drive module looks electricity with primary fan and secondary fan are connected.
Preferably, the primary fan and the secondary fan are both centrifugal fans, the air inlet end faces of the primary fan and the secondary fan are parallel to each other, and the first detection device and the second detection device are respectively installed on the same positions of the volute annular walls of the primary fan and the secondary fan. Of course, the first detection device and the second detection device may also be installed at the same position of the front cover plate of the primary fan and the secondary fan, respectively, or may be installed at the same position of the rear cover plate of the primary fan and the secondary fan, respectively.
Further preferably, the diameters of the impellers of the primary fan and the secondary fan are the same.
In order to ensure that the primary fan and the secondary fan can be smoothly communicated by fluid, the air outlet of the primary fan is communicated with the air inlet of the secondary fan through an air guide pipe.
Compared with the prior art, the utility model has the advantages of: this two fan type range hoods of establishing ties are used for gathering the wind speed state of main, inferior fan same position respectively through two hot type anemometers to convert the ratio of two wind speeds into the ratio of flow, and combine two temperature sensor, the rotational speed of main, inferior two-stage fan can be adjusted to the controller, through fluid temperature compensation procedure and flow detection procedure, makes the flow of primary fan and secondary fan under different operating modes can be in dynamic balance, and then promotes the oil absorption cigarette effect.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic view of the internal structure of the range hood according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a primary fan according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a secondary fan according to an embodiment of the present invention;
fig. 5 is a control logic diagram of a fluid temperature compensation process of a flow control method according to an embodiment of the present invention;
fig. 6 is a control logic diagram of a flow detection program of the flow control method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1 to 4, the series double-fan type range hood of the present embodiment includes a fan frame 1 and a smoke collecting hood 2, the smoke collecting hood 2 is installed at the bottom of the fan frame 1, a primary fan 3 and a secondary fan 4 which are connected in series are installed inside the fan frame 1, the diameters of impellers of the primary fan 3 and the secondary fan 4 are the same, and an air outlet of the primary fan 3 is in fluid communication with an air inlet of the secondary fan 4 through an air duct 7. The primary fan 3 and the secondary fan 4 are both centrifugal fans, the primary fan 3 and the secondary fan 4 are arranged in the fan frame 1 in an inclined mode, and air inlet end faces are parallel to each other. The primary fan 3 and the secondary fan 4 include a fan motor driving module (not shown) for driving the fan motor to rotate, which is a conventional structure and will not be described.
The primary fan 3 is provided with a first detection device 5, and the secondary fan 4 is provided with a second detection device 6, in this embodiment, the first detection device 5 and the second detection device 6 are respectively arranged on the same position of the volute annular walls of the primary fan 3 and the secondary fan 4. Of course, the first detecting device 5 may be installed on the front cover plate of the volute of the primary fan 3, and the second detecting device 6 may be installed on the front cover plate of the volute of the secondary fan 4 at the same position of the front cover plate of the volute, or the first detecting device 5 may be installed on the rear cover plate of the volute of the primary fan 3, and the second detecting device 6 may be installed on the rear cover plate of the volute of the secondary fan 4 at the same position of the rear cover plate of the volute
Specifically, the first detection device 5 includes a first temperature sensor 51 and a first thermal anemometer 52, and the second detection device 6 includes a second temperature sensor 61, a second thermal anemometer 62, and a heating device 63. The range hood further comprises a controller (not shown in the figure), signal output ends of the first temperature sensor 51, the first thermal type anemometer 52, the second temperature sensor 61 and the second thermal type anemometer 62 are electrically connected with a signal input end of the controller, a signal output end of the controller is electrically connected with the heating device 63 and fan motor driving modules of the primary fan 3 and the secondary fan 4, and therefore the controller can be used for controlling the fan rotating speeds of the heating device 63 and the primary fan 3 and the secondary fan 4.
The thermal anemometer is a kind of flow velocity sensor, and its basic principle is that a very thin metal wire is put in the fluid, and the temperature of the metal wire is higher than that of the fluid by passing current, when the fluid flows through the metal wire along the vertical direction, a part of heat of the metal wire is taken away, and the temperature of the metal wire is reduced. In the present embodiment, the first and second thermal anemometers 52 and 62 are used to acquire the wind speed status of the primary and secondary fans 3 and 4 at the same position, respectively. According to the principle of fluid continuity, the flow Q is proportional to the wind speed V under the condition that the cross section area is unchanged, and the flow Q value of a single fan can be obtained through calculation, that is, the ratio of two wind speeds V at the same position point of the fan can be equivalently converted into the ratio of the flow Q.
In addition, because the range hood sucks and exhausts smoke generated by a cooking environment, the smoke has certain temperature, and in a series double-fan system, the primary fan 3 can cool the smoke for the first time, and the secondary fan 4 can cool the smoke for the second time. That is, the fluid temperature of the fluid itself is different between the primary fan 3 and the secondary fan 4, and generally, the fluid in the primary fan 3 is higher than the fluid in the secondary fan 4. Therefore, in order to make the measurement more accurate, the present embodiment adds the heating device 63 to the second detecting device 6 of the secondary fan 4 for temperature compensation.
The flow control method of the series double-fan type range hood of the embodiment comprises a fluid temperature compensation program and a flow detection program started after the fluid temperature compensation program is completed.
As shown in fig. 5, the fluid temperature compensation procedure includes the following steps:
①, starting the fan, and driving the impeller to generate airflow;
②, the first temperature sensor 51 collects the ambient temperature Ta of the primary fan 3, and the second temperature sensor 61 adopts the ambient temperature Tb of the secondary fan 4;
③, comparing Ta and Tb values by the controller and carrying out corresponding logic judgment;
when Ta < Tb, it is indicated that the first temperature sensor 51 and/or the second temperature sensor 61 are damaged;
when Ta is greater than Tb, starting the heating device 63;
and when Ta is Tb, operating the flow detection program.
As shown in fig. 6, the flow rate detection program includes the following steps:
①, the first thermal anemometer 52 measures the wind speed Va of the primary fan 3, and the second thermal anemometer 62 measures the wind speed Vb of the secondary fan 4;
②, reading the difference between Va and Vb by the controller, and judging the threshold value of the difference and a preset value K;
if Va-Vb is larger than K, the rotating speed of the primary fan 3 is reduced, and the rotating speed of the secondary fan 4 is increased;
if Va-Vb is less than K, increasing the rotating speed of the primary fan 3 and reducing the rotating speed of the secondary fan 4;
and if Va-Vb is equal to K, maintaining the current fan rotating speeds of the primary fan 3 and the secondary fan 4.
The preset value K is a factory design value, and the range hood gears correspond to the K values one by one, for example, a large air volume gear corresponds to K1, a medium gear corresponds to K2, and a small gear corresponds to K3.
Claims (4)
1. The utility model provides a two fan type range hoods of establishing ties, includes fan frame (1) and collection petticoat pipe (2) of locating the fan frame bottom, fan frame (1) internally mounted has primary fan (3) and secondary fan (4) of establishing ties each other, the air outlet of primary fan (3) and the air intake fluid intercommunication of secondary fan (4), its characterized in that: a first detection device (5) is arranged on the primary fan (3), a second detection device (6) is arranged on the secondary fan (4), the first detection means (5) comprising a first temperature sensor (51) and a first thermal anemometer (52), the second detection device (6) comprises a second temperature sensor (61), a second thermal type anemometer (62), a heating device (63) and a controller for controlling the heating device (63) and the rotating speeds of the primary fan (3) and the secondary fan (4), the signal output ends of the first temperature sensor (51), the first thermal type anemometer (52), the second temperature sensor (61) and the second thermal type anemometer (62) are electrically connected with the signal input end of the controller, and the signal output end of the controller is electrically connected with the heating device (63) and fan motor driving modules of the primary fan (3) and the secondary fan (4).
2. The series double-fan type range hood according to claim 1, wherein: the primary fan (3) and the secondary fan (4) are both centrifugal fans, the air inlet end faces of the primary fan (3) and the secondary fan (4) are parallel to each other, and the first detection device (5) and the second detection device (6) are respectively installed on the same positions of the volute annular walls of the primary fan (3) and the secondary fan (4).
3. The tandem double-fan type range hood according to claim 2, wherein: the diameters of the impellers of the primary fan (3) and the secondary fan (4) are the same.
4. The series double-fan type range hood according to claim 1, wherein: the air outlet of the primary fan (3) is communicated with the air inlet of the secondary fan (4) through an air guide pipe (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920717484.XU CN210399054U (en) | 2019-05-19 | 2019-05-19 | Series double-fan type range hood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920717484.XU CN210399054U (en) | 2019-05-19 | 2019-05-19 | Series double-fan type range hood |
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| CN210399054U true CN210399054U (en) | 2020-04-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186088A (en) * | 2019-05-19 | 2019-08-30 | 宁波方太厨具有限公司 | A kind of series connection two fans type range hood and its flow control methods |
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2019
- 2019-05-19 CN CN201920717484.XU patent/CN210399054U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186088A (en) * | 2019-05-19 | 2019-08-30 | 宁波方太厨具有限公司 | A kind of series connection two fans type range hood and its flow control methods |
| CN110186088B (en) * | 2019-05-19 | 2024-02-20 | 宁波方太厨具有限公司 | Series double-fan type range hood and flow control method thereof |
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