CN210197389U - Series double-fan type range hood - Google Patents
Series double-fan type range hood Download PDFInfo
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- CN210197389U CN210197389U CN201920719762.5U CN201920719762U CN210197389U CN 210197389 U CN210197389 U CN 210197389U CN 201920719762 U CN201920719762 U CN 201920719762U CN 210197389 U CN210197389 U CN 210197389U
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Abstract
A series double-fan type range hood comprises a fan frame, a primary fan and a secondary fan which are mutually connected in series are arranged in the fan frame, an air outlet of the primary fan is communicated with an air inlet of the secondary fan in a fluid mode, a flow detection device capable of detecting the flow of the primary fan and the flow of the secondary fan is arranged in the fan frame, a signal output end of the flow detection device is electrically connected with a signal input end of a controller, and a signal output end of the controller is electrically connected with fan motor driving modules of the primary fan and the secondary fan. The series double-fan type range hood can correspondingly adjust the rotating speeds of the primary fan and the secondary fan according to the received output signal of the flow detection device, so that the flow of the primary fan and the secondary fan is in dynamic balance within a design value range all the time in different installation environments or different public flue opening rates, and the range hood can further ensure the range hood oil smoke absorption effect under different working conditions.
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. In conclusion, the existing series double-fan type range hood needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to above-mentioned prior art current situation, a flow that enables primary and secondary two-stage fan is in the two fan type range hoods of series connection of dynamic balance state is provided.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: this series connection double fan type range hood, including fan frame and collection petticoat pipe, 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: the fan frame is internally provided with a flow detection device which can detect the flow of the primary fan and the secondary fan, the signal output end of the flow detection device is electrically connected with the signal input end of the controller, and the signal output end of the controller is electrically connected with the fan motor driving modules of the primary fan and the secondary fan.
The flow rate detecting means may have various structures, and preferably, the flow rate detecting means includes a first pipe, a second pipe, a U-shaped pipe, a first float, a second float, a first link, a second link, and a sensor, the air inlet end of the first conduit is communicated with the inner cavity of the primary fan, the air outlet end of the first conduit is communicated with the first end of the U-shaped pipe, the air inlet end of the second conduit is communicated with the inner cavity of the secondary fan, the air outlet end of the second conduit is communicated with the second end of the U-shaped pipe, liquid is injected into the U-shaped pipe, the first end of the first connecting rod is connected with the first floater, the second end of the first connecting rod is connected with the sensor, the first end of the second connecting rod is connected with the second floater, the second end of the second connecting rod is connected with the sensor, the first floater is arranged on the liquid level in the first end of the U-shaped pipe, and the second floater is arranged on the liquid level in the second end of the U-shaped pipe.
Preferably, the sensor is a distance sensor or a capacitive sensor.
The first guide pipe and the second guide pipe can be provided with a plurality of mounting positions, preferably, the primary fan and the secondary fan are both centrifugal fans, the air inlet end surfaces of the primary fan and the secondary fan are parallel to each other, and the air inlet end of the first guide pipe and the air inlet end of the second guide pipe are respectively connected to the volute side walls of the primary fan and the secondary fan.
In order to equalize static pressure at the air inlets of the corresponding conduits of the primary fan and the secondary fan, the air inlets of the first conduit and the second conduit are respectively used for radially feeding air along the respective impellers, and the air feeding direction of the first conduit is consistent with the air feeding direction of the second conduit.
Preferably, the primary fan and the secondary fan are both centrifugal fans, the air inlet end surfaces of the primary fan and the secondary fan are parallel to each other, the air inlet end of the first guide pipe and the air inlet end of the second guide pipe are respectively connected to the volute front cover plates of the primary fan and the secondary fan, and the air inlet direction of the first guide pipe is consistent with the air inlet direction of the second guide pipe.
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, the air inlet end of the first guide pipe and the air inlet end of the second guide pipe are respectively connected to the volute rear cover plates of the primary fan and the secondary fan, and the air inlet direction of the first guide pipe is consistent with the air inlet direction of the second guide pipe.
The flow detection device can be installed at a plurality of positions inside the fan frame, and preferably, an outlet plate is installed at an outlet of the primary fan, and the flow detection device is installed on the outlet plate.
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: the flow detection device capable of detecting the flow of the primary fan and the secondary fan is arranged in the fan frame of the series double-fan type range hood, and the controller can correspondingly adjust the rotating speed of the primary fan and the secondary fan according to the received output signal of the flow detection device, so that the flow of the primary fan and the secondary fan is always in dynamic balance within a design value range in different installation environments or different public flue opening rates, and the oil smoke absorption effect of the range hood under different working conditions is further ensured.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a schematic structural view of the blower frame and the fume collecting hood of FIG. 1 with the blower frame and the fume collecting hood removed;
FIG. 3 is a schematic structural view of the hidden fan in FIG. 2;
fig. 4 is a schematic view of an installation structure of a first conduit according to a first embodiment of the present invention;
fig. 5 is a schematic structural view of a flow rate detection device according to a first embodiment of the present invention;
fig. 6 is a control logic diagram of a flow control method according to a first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second embodiment of the present invention;
fig. 8 is a schematic view of an installation structure of a second conduit according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The first embodiment is as follows:
as shown in fig. 1 to 5, 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, diameters of impellers of the primary fan 3 and the secondary fan 4 are the same, an air outlet plate 6 is installed at an outlet of the primary fan 3, 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 guide pipe 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 fan frame 1 is internally provided with a flow detection device 5 which can detect the flow of the primary fan 3 and the secondary fan 4. 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 range hood further comprises a controller 8, a signal output end of the flow detection device 5 is electrically connected with a signal input end of the controller 8, and a signal output end of the controller 8 is electrically connected with a fan motor driving module, so that the controller 8 can correspondingly adjust the motor rotating speeds of the primary fan 3 and the secondary fan 4 according to the received output signal of the flow detection device 5, and further correspondingly adjust the flow of the primary fan 3 and the secondary fan 4.
The flow rate detection device 5 of the present embodiment is mounted on the outlet plate 6. The flow rate detecting device 5 includes a first conduit 51, a second conduit 52, a U-shaped tube 53, a first float 54, a second float 55, a first link 56, a second link 57, and a sensor 58, and the U-shaped tube 53, the first float 54, the second float 55, the first link 56, the second link 57, and the sensor 58 are all provided inside the housing 50. The air inlet end of the first conduit 51 is communicated with the inner cavity of the primary fan 3, the air outlet end of the first conduit 51 extends into the shell 50 and is communicated with the first end of the U-shaped pipe 53, the air inlet end of the second conduit 52 is communicated with the inner cavity of the secondary fan 4, the air outlet end of the second conduit 52 extends into the shell 50 and is communicated with the second end of the U-shaped pipe 53, liquid 59 is injected into the U-shaped pipe 53, the first end of the first connecting rod 56 is connected with the first floater 54, the second end of the first connecting rod 56 is connected to the sensor 58, the first end of the second connecting rod 57 is connected with the second floater 55, the second end of the second connecting rod 57 is connected to the sensor 58, the first floater 54 is arranged on the liquid level in the first end of the U-shaped pipe 53, and the second floater 55 is arranged on the liquid level in the second end of the U-shaped pipe 53. In addition, the sensor 58 may employ a distance sensor or a capacitance sensor, and the sensor 58 may output a corresponding value with the displacement of the first and second floats 54 and 55.
The air intake end of the first duct 51 and the air intake end of the second duct 52 of the present embodiment are connected to the volute side walls of the primary fan 3 and the secondary fan 4, respectively. And, the air inlets of the air inlet ends of the first conduit 51 and the second conduit 52 are all along the radial direction of the respective impellers, and the air inlet direction of the first conduit 51 is consistent with the air inlet direction of the second conduit 52. Therefore, the static pressure at the air inlets of the corresponding conduits of the primary fan and the secondary fan can be ensured to be equal, and the flow detection device 5 can be more beneficial to detecting the flow difference between the primary fan 3 and the secondary fan 4.
As shown in fig. 6, the flow control method of the series double-fan type range hood is characterized by comprising the following steps:
①, starting the range hood;
②, a sensor 58 of the flow detection device 5 detects the flow of the primary fan 3 and the secondary fan 4, and the output signal of the sensor 58 is transmitted to the controller 8 after passing through a signal amplifier 9;
③, the controller 8 judges the relationship between the difference value of the flow rates of the primary fan 3 and the secondary fan 4 and the preset value according to the received signals;
if the flow difference value is larger than the preset value, the rotating speed of the primary fan 3 is reduced, and the rotating speed of the secondary fan 4 is increased;
if the flow difference value is smaller than the preset value, the rotating speed of the primary fan 3 is increased, and the rotating speed of the secondary fan 4 is reduced;
if the flow difference value is equal to the preset value, the rotating speeds of the primary fan 3 and the secondary fan 4 are kept unchanged.
The flow control detection device has the following working principle:
when the flow in the primary fan 3 is large and the flow in the secondary fan 4 is small, the first floater 54 descends along with the liquid level, the second floater 55 ascends along with the liquid level, and as the first floater 54 and the first connecting rod 56 and the second floater 55 and the second connecting rod 57 are rigidly connected, the sensor 58 detects the displacement change of the first floater 54 and the second floater 55, converts the displacement change into an electric signal and transmits the electric signal to the controller 8, and the controller 8 controls the rotating speed of the motor through the motor driving module, so as to adjust the flow of the primary fan 3 and the flow of the secondary fan 4.
Example two:
as shown in fig. 7 and 8, the air inlet end of the first duct 51 and the air inlet end of the second duct 52 of the flow rate detection device 5 of the present embodiment are respectively connected to the volute front cover plates of the primary fan 3 and the secondary fan 4, and the air inlet direction of the first duct 51 coincides with the air inlet direction of the second duct 52. The rest of the structure of the present embodiment is the same as that of the first embodiment, and will not be described herein.
Example three:
as shown in fig. 9, the air inlet end of the first duct 51 and the air inlet end of the second duct 52 of the flow rate detection device 5 of the present embodiment are respectively connected to the volute back covers of the primary fan 3 and the secondary fan 4, and the air inlet direction of the first duct 51 coincides with the air inlet direction of the second duct 52. The rest of the structure of the present embodiment is the same as that of the first embodiment, and will not be described herein.
Claims (9)
1. The utility model provides a series connection double fan type range hood, includes fan frame (1) and collection petticoat pipe (2), 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: the fan frame (1) is internally provided with a flow detection device (5) capable of detecting the flow of the primary fan and the secondary fan, the signal output end of the flow detection device (5) is electrically connected with the signal input end of the controller (8), and the signal output end of the controller (8) is electrically connected with the 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 flow detection device (5) comprises a first guide pipe (51), a second guide pipe (52), a U-shaped pipe (53), a first floater (54), a second floater (55), a first connecting rod (56), a second connecting rod (57) and a sensor (58), wherein the air inlet end of the first guide pipe (51) is communicated with the inner cavity of the primary fan (3), the air outlet end of the first guide pipe (51) is communicated with the first end of the U-shaped pipe (53), the air inlet end of the second guide pipe (52) is communicated with the inner cavity of the secondary fan (4), the air outlet end of the second guide pipe (52) is communicated with the second end of the U-shaped pipe (53), liquid (59) is injected into the U-shaped pipe (53), the first end of the first connecting rod (56) is connected with the first floater (54), the second end of the first connecting rod (56) is connected to the sensor (58), and the first end of the second connecting rod (57) is connected with the second floater (55), the second end of the second connecting rod (57) is connected to a sensor (58), the first floater (54) is arranged on the liquid surface in the first end of the U-shaped pipe (53), and the second floater (55) is arranged on the liquid surface in the second end of the U-shaped pipe (53).
3. The tandem double-fan type range hood according to claim 2, wherein: the sensor (58) is a distance sensor or a capacitive sensor.
4. The tandem double-fan type range hood according to claim 2, wherein: the centrifugal fan is characterized in that 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 air inlet end of the first guide pipe (51) and the air inlet end of the second guide pipe (52) are connected to the volute side walls of the primary fan (3) and the secondary fan (4) respectively.
5. The series connection double fan type range hood of claim 4, wherein: the air inlets of the air inlet ends of the first guide pipe (51) and the second guide pipe (52) are used for introducing air along the radial direction of the respective impellers, and the air inlet direction of the first guide pipe (51) is consistent with the air inlet direction of the second guide pipe (52).
6. The tandem double-fan type range hood according to claim 2, wherein: the air inlet end face of the main fan (3) and the air inlet end face of the secondary fan (4) are parallel to each other, the air inlet end of the first guide pipe (51) and the air inlet end of the second guide pipe (52) are connected to the volute front cover plates of the main fan (3) and the secondary fan (4) respectively, and the air inlet direction of the first guide pipe (51) is consistent with the air inlet direction of the second guide pipe (52).
7. The tandem double-fan type range hood according to claim 2, wherein: the air inlet end face of the main fan (3) and the air inlet end face of the secondary fan (4) are parallel to each other, the air inlet end of the first guide pipe (51) and the air inlet end of the second guide pipe (52) are connected to the volute rear cover plates of the main fan (3) and the secondary fan (4) respectively, and the air inlet direction of the first guide pipe (51) is consistent with the air inlet direction of the second guide pipe (52).
8. The series double-fan type range hood according to claim 1, wherein: an air outlet plate (6) is installed at the outlet of the primary fan (3), and the flow detection device (5) is installed on the air outlet plate (6).
9. 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 |
|---|---|---|---|
| CN201920719762.5U CN210197389U (en) | 2019-05-19 | 2019-05-19 | Series double-fan type range hood |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920719762.5U CN210197389U (en) | 2019-05-19 | 2019-05-19 | Series double-fan type range hood |
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| CN210197389U true CN210197389U (en) | 2020-03-27 |
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| CN201920719762.5U Active CN210197389U (en) | 2019-05-19 | 2019-05-19 | Series double-fan type range hood |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186087A (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 CN201920719762.5U patent/CN210197389U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186087A (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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