A range hood exhaust system and method of controlling the same

Abstract

The application relates to a range hood exhaust system and a control method thereof. The range hood exhaust system comprises: a fan system arranged in the range hood, wherein the fan system comprises a volute, an impeller arranged in the volute, and a motor for driving the impeller to rotate, and the volute is provided with an air outlet; an exhaust pipe arranged outside the range hood and connected with the air outlet of the volute, wherein the exhaust pipe is a telescopic pipe with adjustable length; and a detection module for detecting the telescopic state of the exhaust pipe; and a controller connected with the detection module and the motor, wherein the controller is configured to update the working current of the motor according to the telescopic state of the exhaust pipe detected by the detection module. The exhaust system can keep the performance of the whole machine consistent when the external working conditions are consistent, reduce the performance loss caused by installation differences, and ensure the normal use of the range hood.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil fume purification, and in particular to an exhaust system of an extractor hood and a control method thereof. BACKGROUND

[0002] The extractor hood is a kitchen product for purifying the kitchen environment. The extractor hood works by using the principle of fluid dynamics, and absorbs and discharges the oil fume through the centrifugal fan installed in the extractor hood. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor driving the impeller to rotate. When the impeller rotates, a negative pressure suction is generated at the center of the fan, which sucks the oil fume below the extractor hood into the fan, and the oil fume is accelerated by the fan, collected by the volute, guided, and discharged into the public flue through the exhaust pipe.

[0003] The exhaust pipe of the extractor hood in the prior art is usually a telescopic pipe. Since the installation positions of the extractor hoods of different users and the positions of the public flues are different, the lengths and telescopic states of the exhaust pipes used by the users during installation are different, and the state of the exhaust pipe directly affects the exhaust pressure, causing different working states of the fan system, and thus even if the external working conditions are consistent, the exhaust performance is different due to the different installation states of the exhaust pipe, affecting the use experience.

[0004] In order to improve the exhaust performance of the exhaust pipe, the Chinese patent application No. CN202011326241.7 (application publication No. CN112283466A) “Pipe and extractor hood” discloses a pipe, the pipe wall of which includes an inner layer and an outer layer, the inner side of the inner layer forms a fluid passage, the outer layer is sleeved on the outer side of the inner layer, and a sealed cavity is formed between the outer layer and the inner layer, the outer layer and / or the inner layer is provided with a filling port for filling material to enter the sealed cavity; the sealed cavity has a filled state and an unfilled state, in the unfilled state, the pipe wall can be folded for storage; from the unfilled state to the filled state, the sealed cavity gradually expands to stretch the pipe wall; in the filled state, the pipe wall can maintain stretching to allow the fluid to pass through; the storage of the pipe in the non-use environment and the stretching of the pipe in the use environment are achieved by changing the state of the sealed cavity, rather than relying on the stretching of the pleated form, which can reduce the along-the-way loss of the fluid, and when used as the air outlet pipe (also referred to as the exhaust pipe) of the extractor hood, the exhaust performance of the extractor hood is improved.

[0005] The range hood in the above patent still has the following limitations in actual use: the exhaust pipe in the above range hood is filled in the sealed cavity to enable the pipe wall to maintain stretching. Although the stretching of the pipe wall is tried to be maintained in actual use, the exhaust pipe itself has certain wrinkles, the positions of the exhaust pipe in different user homes are inconsistent, and different installers have no specific rules for the filling degree of the exhaust pipe. Therefore, the stretching degree of the pipe wall of the exhaust pipe is greatly affected by human factors, and the complete stretching of the pipe wall cannot be achieved, so that the smoke exhaust performance is different, and the use experience is affected. Therefore, the prior art needs to be further improved. SUMMARY

[0006] The first technical problem to be solved by the present application is to provide a range hood smoke exhaust system capable of updating the working gear of the range hood according to the stretching state of the exhaust pipe to improve the use experience.

[0007] The second technical problem to be solved by the present application is to provide a control method of the above range hood smoke exhaust system.

[0008] The technical scheme adopted by the present application to solve the above first technical problem is: a range hood smoke exhaust system, comprising:

[0009] A fan system is arranged in the range hood, and the fan system comprises a volute, an impeller arranged in the volute, and a motor for driving the impeller to rotate, and the volute has an air outlet;

[0010] An exhaust pipe is arranged outside the range hood and is in communication with the air outlet of the volute, and the exhaust pipe is a telescopic pipe with adjustable length;

[0011] characterized in that it further comprises

[0012] a detection module for detecting the stretching state of the exhaust pipe;

[0013] a controller connected with the detection module and the motor, and the controller is configured to update the working gear current of the motor according to the stretching state of the exhaust pipe detected by the detection module.

[0014] In the present scheme, the range hood smoke exhaust system further comprises:

[0015] a first coil arranged in the pipe wall of the exhaust pipe and spirally arranged from top to bottom around the peripheral wall of the exhaust pipe;

[0016] a second coil arranged in the pipe wall of the exhaust pipe in parallel with the first coil and spirally arranged from top to bottom around the peripheral wall of the exhaust pipe, and the first end of the second coil is connected with the first end of the first coil; and

[0017] A power supply is arranged at the inlet end of the smoke exhaust pipe and is connected to the second end of the first coil and the second end of the second coil.

[0018] To prevent sudden changes in voltage and current in the circuit, a unidirectional control module is further connected between the first end of the second coil and the first end of the first coil.

[0019] Preferably, the unidirectional control module is a diode.

[0020] To detect the telescopic state of the smoke exhaust pipe, the detection module comprises sensing modules, at least one of which is arranged at intervals along the length direction of the smoke exhaust pipe, and each sensing module is used to sense the magnetic field in the radial direction of the smoke exhaust pipe and send the sensing result to the controller by wireless means.

[0021] Preferably, each sensing module comprises a control unit and at least two sensing units electrically connected to the control unit, and each control unit is communicatively connected to the controller by wireless means.

[0022] Preferably, the sensing module is a magnetic field sensor, and the alternating current signal frequency for controlling each sensing module is different.

[0023] To install the above-mentioned sensing module to obtain the telescopic state of the smoke exhaust pipe, a support frame is further arranged in the smoke exhaust pipe at intervals along the length direction of the smoke exhaust pipe, and the number of support frames is the same as the number of sensing modules, and each support frame is used to install one control unit and all sensing units electrically connected to the control unit.

[0024] Further, each support frame is in the shape of a cross, comprising two first support rods and two second support rods arranged in a cross, the two ends of the first support rods and the second support rods are respectively abutted against the inner wall of the smoke exhaust pipe, the control unit is arranged at the intersection of the first support rod and the second support rod, and the sensing units are arranged on the first support rod and / or the second support rod.

[0025] To realize the telescopic state of the smoke exhaust pipe, the smoke exhaust pipe is an aluminum foil pipe, comprising a spiral steel wire, an outer aluminum foil layer wrapped on the outer surface of the steel wire, and an inner aluminum foil layer wrapped on the inner surface of the steel wire.

[0026] The technical solution adopted by the present application to solve the above-mentioned second technical problem is: a control method for the above-mentioned smoke exhaust system of the extractor hood, characterized in that it comprises the following steps:

[0027] Step 1, turn on the extractor hood, and start the motor;

[0028] Step 2, pass current A0 to the first coil, and calculate the length L1 of the first coil according to the voltage drop amplitude of the two ends of the first coil.

[0029] Step 3, judge whether the first coil length L1 is equal to the preset length L0, L0 is the length corresponding to the exhaust pipe when it is not contracted, if yes, turn to step 5; if no, turn to step 4;

[0030] Step 4, update the preset length L0 with the current first coil length L1, and turn to step 7;

[0031] Step 5, obtain the pressure at the end of the current exhaust pipe, and adjust the working current of the motor according to the pressure at the end of the current exhaust pipe, so that the motor works with the latest gear current curve, at the same time, obtain the current speed n1 of the motor, and find the preset speed n0 corresponding to the current working gear of the motor in the motor preset speed curve library;

[0032] Step 6, judge whether the difference between n1 and n0 is greater than the threshold n, if yes, turn to step 7; if no, make the motor work with the latest gear current curve;

[0033] Step 7, obtain the latest shape data of the exhaust pipe, and update the gear current curve of the motor and the motor preset speed curve library according to the latest shape data of the exhaust pipe, so that the motor works with the latest gear current curve.

[0034] In order to realize the detection of the telescopic state of the exhaust pipe, the specific steps of obtaining the latest shape data of the exhaust pipe in step 7 are as follows:

[0035] Step 7-1, pass an alternating signal into the first coil, the frequency of the alternating signal can make all the sensing modules obtain recognition;

[0036] Step 7-2, identify all the sensing modules through the control module and determine the number n5 of the sensing modules and the smallest serial number n4 of the sensing modules, all the serial numbers of the sensing modules are continuous serial numbers;

[0037] Step 7-3, calculate the number n3 of the sensing modules;

[0038] Step 7-4, judge whether n5 is equal to n3, if yes, turn to step 7-5; if no, it is abnormal, end;

[0039] Step 7-5, let n6 = n4, and obtain the frequency of the nth6 sensing module;

[0040] Step 7-6, pass the alternating signal corresponding to the nth6 sensing module into the first coil, so that the nth6 sensing module works for a time t0; t0 is the time required for each sensing module to complete data acquisition and data transmission once;

[0041] Step 7-7, the control module collects the transmission signals of the n6 modules, and records the sensing data calculation results;

[0042] Step 7-8, judging whether n6 is equal to n5+n4-1, if yes, then turn to step 7-9; if no, then update n6 by adding 1 to the value of n6, acquire the frequency of the updated n6th sensing module, and turn to step 7-6;

[0043] Step 7-9, calculating the bending coefficient of the smoke exhaust pipe according to all the sensing module data;

[0044] Step 7-10, judging whether the bending coefficient of the smoke exhaust pipe is within the preset range, if yes, then updating the gear current curve according to the current bending coefficient of the smoke exhaust pipe, and ending; if no, then reminding of the abnormality, and ending.

[0045] In the above scheme, the sensing modules are equally spaced, the distance between the adjacent two sensing modules is L2, and the calculation formula of n3 in step 7-3 is:

[0046] n3=round(L0 / L2)+1;

[0047] Wherein, round(.) is the integer.

[0048] Compared with the prior art, the advantages of the present application are that: the detection module detects the telescopic state of the smoke exhaust pipe; and the controller is connected with the detection module and the motor, so that the controller can update the working gear current of the motor according to the telescopic state of the smoke exhaust pipe detected by the detection module. Therefore, the smoke exhaust system can keep the whole machine performance consistent when the external working conditions are consistent, reduce the performance loss caused by installation differences, and ensure the normal use of the range hood. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 Fig. 1 is a structural schematic view of the smoke exhaust system of the range hood in the embodiment of the present application;

[0050] Figure 2 Fig. 2 is a sectional view of Fig. 1; Figure 1

[0051] Figure 3 Fig. 3 is a structural schematic view of the installation structure of the smoke exhaust pipe and the detection module in the embodiment of the present application;

[0052] Figure 4 Fig. 4 is a sectional view of Fig. 3; Figure 3

[0053] Figure 5 Fig. 5 is an enlarged view of A in Fig. 3. Figure 4 DETAILED DESCRIPTION

[0054] The present application will be further described in detail below with reference to the embodiment and the accompanying drawings.

[0055] As Figures 1 to 5 ​​​As shown, the range hood exhaust system in the embodiment includes a fan system 1 arranged in the range hood and an exhaust pipe arranged outside the range hood. The fan system 1 includes a volute 11, an impeller 12 arranged in the volute 11, and a motor 13 for driving the impeller 12 to rotate, and the volute 11 has an air outlet. The structure of the range hood is a prior art and will not be described here. The exhaust pipe is in communication with the air outlet of the volute 11 and is a telescopic pipe with adjustable length. An air outlet cover a is arranged between the exhaust pipe and the air outlet of the volute 11 for connecting the two. The exhaust pipe is an aluminum foil pipe which includes a spiral steel wire (not shown in the figure), an outer aluminum foil layer 22 wrapped on the outer surface of the steel wire, and an inner aluminum foil layer 23 wrapped on the inner surface of the steel wire.

[0056] The range hood exhaust system in the embodiment further includes a detection module for detecting the telescopic state of the exhaust pipe and a controller (not shown in the figure), and the controller is connected with the detection module and the motor 13. The controller is configured to update the working current of the motor 13 according to the telescopic state of the exhaust pipe detected by the detection module.

[0057] In order to realize the detection of the telescopic state of the exhaust pipe, the range hood exhaust system further includes a first coil 3, a second coil 4, a power supply, and a unidirectional control module 5. The second coil 4 is arranged side by side with the first coil 3 in the wall of the exhaust pipe and is spirally arranged from top to bottom around the peripheral wall of the exhaust pipe. The first end of the second coil 4 is connected with the first end of the first coil 3 through the unidirectional control module 5. The power supply is arranged at the inlet end of the exhaust pipe and is connected with the second end of the first coil 3 and the second end of the second coil 4. The unidirectional control module 5 in the embodiment is a diode. The first coil 3 can generate a magnetic field, so the detection module includes sensing modules 6. The sensing modules 6 are at least one and are arranged at intervals along the length direction of the exhaust pipe. Each sensing module 6 is used for sensing the magnetic field in the radial direction of the exhaust pipe and sending the sensing result to the controller through a wireless way.

[0058] Each sensing module 6 includes a control unit 61 and at least two sensing units 62 electrically connected with the control unit 61 (four sensing units 62 are electrically connected with each control unit 61 in the embodiment), and each control unit 61 is communicatively connected with the controller through a wireless way. Figure 3 Figure 3 and Figure 4 ​As shown, the smoke exhaust pipe is further provided with support frames 8 arranged along the length direction of the smoke exhaust pipe, the number of the support frames 8 is same as the number of the induction modules 6, each of the support frames 8 is used for mounting one of the control units 61 and all the induction units 62 electrically connected with the control unit 61; in the embodiment, each of the support frames 8 is in cross shape, and respectively comprises two first support rods 81 and two second support rods 82 arranged in cross shape, the two ends of the first support rods 81 and the second support rods 82 are respectively abutted against the inner wall of the smoke exhaust pipe, the control unit 61 is arranged at the cross position of the first support rods 81 and the second support rods 82, and the induction units 62 are arranged on the first support rods 81 and / or the second support rods 82. Figure 3 In the embodiment, two of the induction units 62 are arranged on the first support rods 81, and the other two of the induction units 62 are arranged on the second support rods 82.

[0059] In order to realize the induction of the magnetic field, in the embodiment, the induction module 6 adopts a magnetic field sensor, and the alternating current signal frequency for controlling the operation of each of the induction modules 6 is different, so that the corresponding induction module 6 is controlled to operate according to the different alternating current signal frequency. The above-mentioned technology is prior art, and will not be described in detail here.

[0060] The control method of the smoke exhaust system of the range hood in the embodiment comprises the following steps:

[0061] Step 1, turning on the range hood, so that the motor starts to work;

[0062] Step 2, inputting current A0 to the first coil, and calculating the length L1 of the first coil according to the voltage drop amplitude between the two ends of the first coil;

[0063] Step 3, judging whether the length L1 of the first coil is equal to the preset length L0, L0 is the length corresponding to the state that the smoke exhaust pipe is not contracted, if yes, turning to step 5; if no, turning to step 4;

[0064] Step 4, updating the preset length L0 with the current length L1 of the first coil, and turning to step 7;

[0065] Step 5, obtaining the pressure at the end of the current smoke exhaust pipe, adjusting the working current of the motor according to the pressure at the end of the current smoke exhaust pipe, so that the motor works with the latest gear current curve, obtaining the current rotating speed n1 of the motor, and searching the preset rotating speed n0 corresponding to the current working gear of the motor in the preset rotating speed curve library of the motor;

[0066] Step 6, judging whether the difference between n1 and n0 is greater than a threshold n, if yes, turning to step 7; if no, making the motor work with the latest gear current curve;

[0067] Step 7, obtain the latest shape data of the smoke exhaust pipe, and update the gear current curve of the motor and the motor preset speed curve library according to the latest shape data of the smoke exhaust pipe, so that the motor works with the latest gear current curve;

[0068] In this embodiment, the specific steps for obtaining the latest shape data of the smoke exhaust pipe are as follows:

[0069] Step 7-1, pass an alternating current signal into the first coil, and the frequency of the alternating current signal can enable all the sensing modules to be identified;

[0070] Step 7-2, identify all the sensing modules through the control module and determine the number n5 of the sensing modules and the smallest serial number n4 of the sensing modules, and the serial numbers of all the sensing modules are consecutive serial numbers;

[0071] Step 7-3, calculate the number n3 of the sensing modules;

[0072] In this embodiment, the sensing modules are equally spaced, and the distance between the adjacent two sensing modules is L2. The calculation formula of n3 in step 7-3 is as follows:

[0073] n3 = round (L0 / L2) + 1;

[0074] Wherein, round(.) is an integer;

[0075] Step 7-4, determine whether n5 is equal to n3. If yes, go to step 7-5; if no, it is abnormal, and the process is ended;

[0076] Step 7-5, let n6 = n4, and obtain the frequency of the nth6sensing module;

[0077] Step 7-6, pass the alternating current signal corresponding to the nth6sensing module into the first coil, so that the nth6sensing module works for a time t0. t0 is the time required for each sensing module to complete data acquisition and data transmission once;

[0078] Step 7-7, the control module collects the transmission signal of the n6 module and records the sensing data calculation result;

[0079] Step 7-8, determine whether n6 is equal to n5 + n4 - 1. If yes, go to step 7-9; if no, update n6 by adding 1 to the value of n6, obtain the frequency of the updated nth6sensing module, and go to step 7-6;

[0080] Step 7-9, calculate the bending coefficient of the smoke exhaust pipe according to the data of all the sensing modules;

[0081] Step 7-10, judge whether the bending coefficient of the smoke exhaust duct is in the preset range, if yes, update the gear current curve according to the bending coefficient of the current smoke exhaust duct, end; if not, remind of the abnormality, end.

Claims

1. A range hood exhaust system, comprising: a fan system (1) provided in the range hood, the fan system (1) comprising a volute (11), an impeller (12) provided in the volute (11), and a motor (13) for driving the impeller (12) to rotate, the volute (11) having an air outlet; an exhaust pipe provided outside the range hood and in communication with the air outlet of the volute (11), the exhaust pipe being a telescopic pipe with adjustable length; characterized in that it further comprises a first coil (3) provided in the wall of the exhaust pipe and spirally arranged from top to bottom around the peripheral wall of the exhaust pipe; a second coil (4) provided in the wall of the exhaust pipe side by side with the first coil (3) and spirally arranged from top to bottom around the peripheral wall of the exhaust pipe, the first end of the second coil (4) being connected with the first end of the first coil (3); and a power supply provided at the inlet end of the exhaust pipe and connected with the second end of the first coil (3) and the second end of the second coil (4); a detection module for detecting the telescopic state of the exhaust pipe; a controller connected with the detection module and the motor (13), the controller being configured to update the working current of the motor (13) according to the telescopic state of the exhaust pipe detected by the detection module.

2. The range hood exhaust system of claim 1, wherein: The first end of the second coil (4) and the first end of the first coil (3) are further connected with a one-way control module (5).

3. The range hood exhaust system of claim 2, wherein: The one-way control module (5) is a diode.

4. The range hood exhaust system of claim 1, wherein: The detection module comprises induction modules (6), the induction modules (6) being at least one and arranged in intervals along the length direction of the exhaust pipe, each induction module (6) being used for sensing the magnetic field in the radial direction of the exhaust pipe and sending the sensing result to the controller through wireless mode.

5. The range hood exhaust system of claim 4, wherein: Each induction module (6) comprises a control unit (61) and at least two induction units (62) electrically connected with the control unit (61), each control unit (61) being communicatively connected with the controller through wireless mode.

6. The range hood exhaust system of claim 5, wherein: The induction modules (6) are magnetic field sensors, and the alternating current signal frequencies for controlling each induction module (6) to work are different.

7. The range hood exhaust system of claim 6, wherein: The exhaust pipe is further provided with support frames (8) arranged in intervals along the length direction of the exhaust pipe, the number of the support frames (8) being the same as that of the induction modules (6), and each support frame (8) is used for mounting one control unit (61) and all the induction units (62) electrically connected with the control unit (61).

8. The range hood exhaust system of claim 7, wherein: Each support frame (8) is cruciform and comprises two first support rods (81) and two second support rods (82) arranged in cross, the two ends of the first support rods (81) and the second support rods (82) respectively abutting against the inner wall of the exhaust pipe, the control unit (61) being arranged at the cross position of the first support rods (81) and the second support rods (82), and the induction units (62) being arranged on the first support rods (81) and / or the second support rods (82).

9. The range hood exhaust system according to any one of claims 1-8, wherein: The exhaust pipe is an aluminum foil pipe comprising a spiral steel wire, an outer aluminum foil layer (22) wrapped on the outer surface of the steel wire, and an inner aluminum foil layer (23) wrapped on the inner surface of the steel wire.

10. A control method for a range hood exhaust system according to any one of claims 4 to 8, characterized in that The method comprises the following steps: Step 1, turning on the range hood so that the motor starts to work. Step 2, current A0 is applied to the first coil, and the length L1 of the first coil is calculated according to the voltage drop across the first coil; Step 3, it is judged whether the length L1 of the first coil is equal to the preset length L0, L0 is the length corresponding to the exhaust pipe when it is not contracted, if yes, it is turned to step 5, if no, it is turned to step 4; Step 4, the preset length L0 is updated with the current length L1 of the first coil, and it is turned to step 7; Step 5, the pressure at the end of the current exhaust pipe is obtained, and the working current of the motor is adjusted according to the pressure at the end of the current exhaust pipe, so that the motor works with the latest gear current curve, at the same time, the current speed n1 of the motor is obtained, and the preset speed n0 corresponding to the current working gear of the motor is searched in the motor preset speed curve library; Step 6, it is judged whether the difference between n1 and n0 is greater than the threshold n, if yes, it is turned to step 7, if no, the motor works with the latest gear current curve; Step 7, the latest shape data of the exhaust pipe is obtained, and the gear current curve of the motor and the motor preset speed curve library are updated according to the latest shape data of the exhaust pipe, so that the motor works with the latest gear current curve.

11. The control method according to claim 10, characterized in that: The specific steps for obtaining the latest shape data of the exhaust pipe in step 7 are as follows: Step 7-1, an alternating current signal is applied to the first coil, the frequency of the alternating current signal can make all the sensing modules obtain identification; Step 7-2, all the sensing modules are identified by the control module, and the number n5 of the sensing modules and the smallest serial number n4 of the sensing modules are determined, all the serial numbers of the sensing modules are continuous serial numbers; Step 7-3, the number n3 of the sensing modules is calculated; Step 7-4, it is judged whether n5 is equal to n3, if yes, it is turned to step 7-5, if no, it is abnormal, and the process is ended; Step 7-5, n6 is set as n4, and the frequency of the nth6 sensing module is obtained; Step 7-6, the nth6 sensing module is applied with the alternating current signal corresponding to the nth6 sensing module, so that the nth6 sensing module works for a time t0, t0 is the time required for each sensing module to complete data acquisition and data transmission once; Step 7-7, the control module collects the transmission signals of the n6 modules, and records the sensing data calculation results; Step 7-8, it is judged whether n6 is equal to n5+n4-1, if yes, it is turned to step 7-9, if no, the value of n6 is updated by adding 1, the frequency of the updated nth6 sensing module is obtained, and it is turned to step 7-6; Step 7-9, the bending coefficient of the exhaust pipe is calculated according to the data of all the sensing modules; Step 7-10, it is judged whether the bending coefficient of the exhaust pipe is within the preset range, if yes, the gear current curve is updated according to the current bending coefficient of the exhaust pipe, and the process is ended, if no, it is reminded that it is abnormal, and the process is ended.

12. The control method according to claim 11, characterized in that: The sensing modules are arranged at equal intervals, the distance between two adjacent sensing modules is L2, and the calculation formula of n3 in step 7-3 is as follows: n3 = round(L0 / L2) + 1; Wherein, round(.) is an integer.

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