CN113108336A - Wind pressure control method and device for range hood - Google Patents
Wind pressure control method and device for range hood Download PDFInfo
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- CN113108336A CN113108336A CN202010157052.5A CN202010157052A CN113108336A CN 113108336 A CN113108336 A CN 113108336A CN 202010157052 A CN202010157052 A CN 202010157052A CN 113108336 A CN113108336 A CN 113108336A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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Abstract
The invention discloses a wind pressure control method and a device of a cigarette machine, wherein the cigarette machine comprises a fan, and the wind pressure control method comprises the following steps: acquiring the frequency of a fan and the outlet full pressure of the fan, and acquiring the air quantity value of the fan and the pressure of a common flue according to the frequency of the fan and the outlet full pressure of the fan; determining a target air volume setting interval to which the air volume value of the fan belongs and a corresponding air pressure setting value, and determining the air pressure setting value as the target air pressure setting value when the total pressure of the outlet of the fan exceeds the setting range of the air pressure setting value; and obtaining the target frequency of the fan according to the public flue pressure and the target wind pressure set value and adjusting the target frequency. In the invention, the smoke machine is controlled by the wind pressure feedback sensing to realize the periodic constant effective wind pressure output, and the constant effective wind pressure is realized in the wind volume setting interval where the smoke machine is located.
Description
Technical Field
The invention relates to a smoke treatment technology, in particular to a method and a device for controlling wind pressure of a range hood.
Background
The lampblack absorber is installed in kitchen range upper portion or lateral part, and the integration has the fan, and the operation process of current lampblack absorber makes the kitchen range top form the negative pressure zone for the high-speed rotation of fan, inhales indoor oil smoke inside the lampblack absorber, and oil smoke gas is through purifying and separating for oil dripping and flue gas, and oil dripping is collected the oil cup, and the flue gas is discharged along the flue.
The range hood is provided with a plurality of gears, each gear corresponds to a set air volume, and the air volume of the range hood on the market at present under the nominal gear is an ideal value tested and set under laboratory conditions. In the actual use process, because the resistance of the smoke pipe and the pressure of the common flue exist, the actual effective air volume of the same product and the same gear under different use environments is different. If the pressure of the common flue is higher, the actual effective air volume is lower, the phenomena of oil smoke escape and no smoking can occur, and even the oil smoke of other users flows backwards. The use requirements of users cannot be met.
Disclosure of Invention
The invention provides a method and a device for controlling wind pressure of a cigarette machine, which are used for effectively controlling the wind pressure.
The invention provides a wind pressure control method of a cigarette machine, wherein the cigarette machine comprises a fan, and the wind pressure control method comprises the following steps:
acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring a fan air quantity value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan;
determining a target air volume setting interval to which the fan air volume value belongs and a corresponding air pressure setting value, and determining the air pressure setting value as the target air pressure setting value when the full pressure of the fan outlet exceeds the setting range of the air pressure setting value;
and obtaining the target frequency of the fan according to the common flue pressure and the target wind pressure set value and adjusting the target frequency.
The invention also provides a wind pressure control device of a cigarette machine, the cigarette machine comprises a fan, and the wind pressure control device comprises:
the data acquisition module is used for acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring the air quantity value of the fan and the pressure of a public flue according to the frequency of the fan and the outlet full pressure of the fan;
the data detection module is used for determining a target air volume setting interval to which the fan air volume value belongs and a corresponding air pressure setting value, and determining the air pressure setting value as the target air pressure setting value when the full pressure of the fan outlet exceeds the setting range of the air pressure setting value;
and the data adjusting module is used for obtaining the target frequency of the fan according to the public flue pressure and the target wind pressure set value and adjusting the target frequency.
In the invention, the frequency of the fan and the outlet full pressure of the fan are obtained, and the fan air volume value and the public flue pressure are obtained according to the frequency of the fan and the outlet full pressure of the fan; determining a target air volume setting interval to which the air volume value of the fan belongs and a corresponding air pressure setting value, and determining the air pressure setting value as the target air pressure setting value when the total pressure of the outlet of the fan exceeds the setting range of the air pressure setting value; and obtaining the target frequency of the fan according to the common flue pressure and the target wind pressure set value, adjusting, and then under the common flue pressure at the current moment, enabling the wind pressure and the wind volume output by the fan to be in a set range, so as to realize the constant wind pressure in each wind volume interval, namely the stage constant wind pressure. Therefore, the cigarette machine is controlled by the wind pressure feedback sensor to realize the output of the stage constant effective wind pressure, the effective wind pressure which meets the user requirements under different working conditions is constant, and the effective control of the stage constant wind pressure is realized.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic view of a wind pressure control method of a range hood according to an embodiment of the present invention;
fig. 2 is a schematic view of a wind pressure control method of a range hood according to an embodiment of the present invention;
figure 3 is a schematic illustration of an intermediate load curve of a cigarette machine before optimization;
figure 4 is a schematic illustration of an optimized cigarette machine intermediate load curve;
fig. 5 is a schematic view of a wind pressure control device of a range hood according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, a schematic diagram of a method for controlling wind pressure of a range hood according to an embodiment of the present invention is shown. The cigarette machine described in this embodiment includes a fan, and further includes a wind pressure control device for executing the wind pressure control method, and optionally, the wind pressure control device is implemented in a software and/or hardware manner, and is configured for use in a cigarette machine. For example, the wind pressure control device is integrated in a main controller of the cigarette machine, and the intelligence of the control of the cigarette machine is realized.
The wind pressure control method of the cigarette making machine provided by the embodiment comprises the following steps:
and 110, acquiring the frequency of the fan and the outlet full pressure of the fan, and obtaining the air volume value of the fan and the pressure of the common flue according to the frequency of the fan and the outlet full pressure of the fan.
As described above, various parameters of the fan can be obtained at regular time to perform a subsequent wind pressure control procedure, and various parameters of the fan can also be obtained in real time to perform a subsequent wind pressure control procedure, where the directly obtained fan operation parameters include the frequency of the fan and the total pressure at the outlet of the fan. The fan may be understood to be a motor in a range hood. The actual frequency of the fan collected at the current moment determines the rotating speed of the fan, the rotating speed of the fan and the full-pressure fitting of the fan outlet can determine the air volume of the fan, and the fan air volume value is the actual air volume value of the fan at the current moment.
The difference between the full pressure of the fan outlet and the pressure of the common flue is consumed on the branch pipe of the smoke machine, the branch pipe of the smoke machine is related to the air quantity of the fan, and then the pressure of the common flue at the current moment can be obtained according to the full pressure of the fan outlet and the air quantity value of the fan. It can be understood that the common flue pressure is used as the load of the smoke machine, namely the external pressure, and the full pressure of the fan outlet is output according to the magnitude of the common flue pressure in the house of a user, so that the common flue pressure and the full pressure of the fan outlet have absolute correlation, and the performance change of the full pressure of the fan outlet can be regarded as the change of the common flue pressure.
And 120, determining a target air volume setting interval to which the fan air volume value belongs and a corresponding air pressure setting value, and determining the air pressure setting value as the target air pressure setting value when the full pressure of the fan outlet exceeds the setting range of the air pressure setting value.
As described above, the wind pressure control device stores a plurality of adjacent air volume setting sections in advance, for example, at least a first air volume setting section and a 2 nd air volume setting section, and an upper limit of the 1 st air volume setting section is the same as a lower limit of the 2 nd air volume setting section. Each air volume setting interval has a corresponding air pressure setting value, and it can be understood that the size and the division of the air volume setting interval and the corresponding air pressure setting value of each air volume setting interval are set according to parameters in an ideal state. For example, the 1 st air volume setting interval is [0, 11], and the corresponding air pressure setting value is 550 Pa; the 2 nd air volume setting interval is (11, 15), and the corresponding air pressure setting value is 350 Pa., so that the maximum air volume 15 is the maximum air volume of the existing range hood, and obviously, the maximum air volume of the range hood can be other values.
As described above, the fan air volume value can be obtained according to step 110, and the air pressure control device stores a plurality of air volume setting sections in advance, so that the air pressure control device can determine the air volume setting section to which the fan air volume value actually belongs, and the air volume setting section to which the fan air volume value determined at the current time belongs is the target air volume setting section. Each air volume setting interval prestored in the air pressure control device also has a corresponding air pressure set value, and the characteristic that the air pressure of the range hood in the air volume setting interval is maintained in the setting range of the air pressure set value is shown.
And if the wind pressure set value corresponding to the target wind volume set interval to which the wind volume value of the fan belongs at the current moment is known, the wind pressure control device detects whether the full pressure of the outlet of the fan collected at the current moment exceeds the set range of the wind pressure set value.
If the total pressure of the outlet of the fan collected at the current moment is within the set range of the wind pressure set value, the actual wind pressure and the actual wind volume of the range hood at the current moment are both in the normal range, and the wind pressure regulation is not needed, and the step 110 can be returned to continue to be executed.
If the fan export total pressure of gathering under the current moment surpasss the settlement within range of this wind pressure setting value, then explain that the actual amount of wind of cigarette machine is in target amount of wind settlement interval under the current moment, but the actual wind pressure surpasss the normal wind pressure scope that corresponds at present, need adjust the wind pressure this moment for under the current moment, the actual amount of wind and the wind pressure of cigarette machine are in the ideal within range, guarantee permanent wind pressure. Thus, the corresponding wind pressure set value is determined as the target wind pressure set value.
It is understood that the range formed by the error of the fluctuation of the wind pressure set value is the set range of the wind pressure set value, and the wind pressure set value is an ideal constant wind pressure value predetermined in the actual load range of the user, for example, the error is ± 50 Pa.
And step 130, obtaining and adjusting the target frequency of the fan according to the common flue pressure and the target wind pressure set value.
In actual use, the performance of the range hood is limited by the common flue pressure of the range hood in the environment, and the common flue pressure is not constant. The larger the pressure of the common flue is, the worse the working condition environment of the range hood is, and the larger the wind pressure change required for maintaining the wind volume at the current moment is; the smaller the pressure of the public flue is, the better the working condition environment of the range hood is, and the smaller the wind pressure change required for maintaining the current wind volume is. It has been found that the common flue pressure of the lower floors is generally greater than the common flue pressure of the higher floors.
In this embodiment, the target frequency of the fan required to reach the set range of the target wind pressure set value within the target wind volume setting interval is calculated and adjusted according to the common flue pressure and the target wind pressure set value, and then both the adjusted wind volume and the adjusted wind pressure are maintained within the target set range. Obviously, when the air volume is within the target air volume setting interval by the air pressure control program, the actual air pressure of the range hood is always maintained within the setting range of the target air pressure value, which can be regarded as that the range hood realizes constant air pressure within the target air volume setting interval, and obviously, the range hood realizes corresponding constant air pressure within each air volume setting interval, namely, the stage constant air pressure. The influence of the pressure of the common flue at the current moment is considered in the air pressure control process of the cigarette machine, so that the adjusted air pressure is more accurate, and the smoking effect of the cigarette machine can be improved.
As mentioned above, for the cigarette machine with poor working condition, the target frequency obtained by the formula reverse operation is greater than the actual frequency of the fan collected at the current moment, so that the fan of the cigarette machine can be controlled to output sufficient rotating speed, the effective wind pressure is improved, and the smoking effect is ensured. To the better cigarette machine of operating mode, the target frequency that obtains according to formula reverse operation is less than the actual frequency of the fan of gathering at the present moment, so the fan of control cigarette machine can reduce the rotational speed to this reduces the wind pressure, when guaranteeing the smoking effect, can also the noise reduction, promotes user experience. The constant-air pressure cigarette machine considers the demands of different air volume intervals, reduces the noise of the cigarette machine in high-rise users on the basis of guaranteeing the user using demands, and improves the smoking effect of the cigarette machine in low-rise users.
In the embodiment, the frequency of the fan and the outlet full pressure of the fan are obtained, and the fan air volume value and the common flue pressure are obtained according to the frequency of the fan and the outlet full pressure of the fan; determining a target air volume setting interval to which the air volume value of the fan belongs and a corresponding air pressure setting value, and determining the air pressure setting value as the target air pressure setting value when the total pressure of the outlet of the fan exceeds the setting range of the air pressure setting value; and obtaining the target frequency of the fan according to the common flue pressure and the target wind pressure set value, adjusting, and then under the common flue pressure at the current moment, enabling the wind pressure and the wind volume output by the fan to be in a set range, so as to realize the constant wind pressure in each wind volume interval, namely the stage constant wind pressure. Therefore, the cigarette machine is controlled by the wind pressure feedback sensor to realize the output of the stage constant effective wind pressure, the effective wind pressure which meets the user requirements under different working conditions is constant, and the effective control of the stage constant wind pressure is realized.
Illustratively, on the basis of the foregoing technical solution, as shown in fig. 2, the operation of step 110 may be selected, the frequency of the fan and the full outlet pressure of the fan are obtained, and the fan air volume value and the common flue pressure are obtained according to the fan frequency and the full outlet pressure of the fan, which specifically includes:
n＝μ(f) (1)；
Q＝G(n，PT) (2)；
Wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, and A is the sectional area of the branch pipe of the cigarette machine.
In the mathematical model of the smoke machine, windThe rotating speed and the frequency of the fan are in a linear relation and have a functional relation shown in formula (1), and the actual rotating speed n0 of the fan at the current moment can be calculated according to the formula (1) and the actual frequency f0 at the current moment. According to the P-Q characteristic performance test data of the fan, the air quantity Q of the fan can be determined by the rotating speed n and the full pressure P of the fanTFitting and determining, wherein the functional relation of the functional relation satisfies the formula (2), knowing the actual rotating speed n0 of the fan at the current moment and the actually acquired full pressure P of the outlet of the fanT0And obtaining the actually output fan air quantity value Q0 at the current moment according to the formula (2). The difference between the full pressure of the fan outlet and the pressure of the common flue is consumed on the branch pipe of the range hood, the equation is the formula (3), and based on the equation relationship, the full pressure P of the fan outlet is knownT0And the air volume value Q0 of the fan, the common flue pressure P0 of the cigarette machine at the current moment can be calculated according to the formula (3).
As shown in fig. 2, the operation of step 130 can be selected, and the target frequency of the fan is obtained and adjusted according to the common flue pressure and the target wind pressure setting value, which specifically includes:
131, according to the target wind pressure set value PTsetAnd the common flue pressure P0, and the target wind pressure set value P is obtained under the common flue pressure P0 through calculation according to the formula (3)TsetThe required fan demand air quantity Q1,
and determining to obtain the target frequency of the fan.
As described above, the common flue pressure P0 of the environment where the range hood is located is known at the current time, and the target wind pressure set value P is also known at the current timeTsetThen, according to the formula (3), the target wind pressure set value P can be reached under the common flue pressure P0 at the current momentTsetRequired fan demand air quantity Q1, i.e. PTset-P0＝αQ12Then, then
In addition, the wind pressure P of the fan outlet at the current momentT0The fan air quantity value Q0 and the common flue pressure P0 satisfy the formula (3)PT0-P0＝αQ02If P0 is equal to PT0-αQ02. Then combining the equation of Q1 and the equation of P0, the required air quantity Q1 of the fan is known as
Therefore, the pressure of the variable common flue can be eliminated, so that the required air quantity Q1 of the fan at the current moment is only equal to the target air pressure set value PTsetFull pressure P at outlet of fanT0And fan air flow value Q1. Based on the method, the wind pressure P of the fan outlet at the moment is directly acquired in the follow-up wind pressure control processT0Actual fan air quantity value Q0 and real-time determined target air pressure set value PTsetThe required air quantity Q1 required by the fan can be directly obtained according to the formula Q1, and the air pressure control process is simple.
And 132, adjusting the frequency of the fan to the target frequency of the fan.
At the present time, Q1 ═ G (n1, P) can be obtained according to formula (2)Tset) Wherein n1 represents that the target wind pressure set value P is reached under the common flue pressure P0 at the current momentTsetAnd the required fan rotating speed is required when the required fan air quantity Q1 is met, then n1 is G-1 Q1(PTset). If the fan speed and the fan frequency satisfy equation (1), n1 ═ μ (f1) and f1 ═ μ (f1) can be obtained-1(n1), wherein f1 is characterized in that the target wind pressure set value P is reached under the common flue pressure P0 at the current momentTsetAnd the target fan frequency required by the fan when the air quantity Q1 is required.
And adjusting the frequency of the fan according to f1 to enable the frequency of the fan to be equal to the target frequency f1, wherein after the fan operates according to the adjusted target frequency, the actual air volume output by the range hood is within a target air volume setting interval, and meanwhile, the air pressure of the range hood is within a setting range of a corresponding target air pressure setting value, so that constant air pressure within the air volume setting interval is realized.
As shown in fig. 2, the optional wind pressure control method further includes: if the full pressure of the outlet of the fan is within the set range of the wind pressure set value, or the fan is adjusted according to the target frequency of the fan, the wind pressure control process is started again after the set time length is prolonged. If the full pressure of the fan outlet is in the set range of the wind pressure set value corresponding to the target wind volume set interval at the current moment, the actual effective wind pressure output by the cigarette making machine is close to the ideal wind pressure, the smoking effect meets the user requirement, and the process restarts from the step 110 at the next moment t0+ delta t. Alternatively, after completing the frequency adjustment of the fan at step 130, the process restarts from step 110 after the set time duration Δ t.
It can be understood that the set time length delta t can be very small (for example, less than 1 second), and the real-time adjustment of the wind pressure of the whole range hood is realized, so that the range hood is always in the set range of the wind pressure set value corresponding to the target wind volume set interval in the operation process, and the user experience is improved. The set time length delta t can be relatively large (about 2 minutes, for example), timing adjustment of the wind pressure of the range hood is achieved, the range hood is adjusted in timing after certain gathering of smoke is generated, and power consumption can be reduced.
The following description will be made by comparing the existing cigarette making machine with the cigarette making machine described in the embodiments of the present invention. The ordinate is the actual load of a user, namely the pressure of a common flue, the abscissa is the actual output air volume of the range hood, the ascending curve is an impedance curve of the range hood, the descending curve is a pressure-air volume curve, and the straight line segment is a wind pressure line segment.
Referring to figure 3, a graph of the performance of a prior art cigarette making machine is shown. According to the formula (3), under the condition that the full pressure of a fan outlet of the range hood, namely the air pressure of the fan is determined, the larger the pressure of the common flue is, the smaller the actual output air volume of the range hood is; under the condition that the air pressure of the range hood is determined, the smaller the pressure of the common flue is, the larger the actual output air quantity of the range hood is. The smoke machine with poor working condition has larger pressure of the common flue, so that the actual output air volume under normal air pressure is smaller than the air volume value meeting the user requirement, and the smoke machine has poor smoking effect and does not smoke. For the cigarette machine with better working condition, the pressure of the common flue of the cigarette machine is smaller, the actual output air quantity is larger than the air quantity value meeting the user requirement, the smoking effect is not problematic, but the air quantity is overlarge, so that the noise is large.
Referring to fig. 4, a performance curve of the optimized staged constant effective wind pressure cigarette maker is shown. When the amount of wind at the cigarette machine was in and sets for the interval, the effective wind pressure of cigarette machine reality was invariable, and this effective wind pressure of reality can not change along with external load's change in the amount of wind is set for the interval, and the effective wind pressure that satisfies the user demand is invariable, realizes the stage nature constant air volume, has improved the smoking effect. Specifically, users 1, 2, and 3 represent different flue impedance curves of 3 users, point a is the intersection point of the impedance curve of user 1 and the constant wind pressure line segment, point B is the intersection point of the impedance curve of user 2 and the constant wind pressure line segment, point C is the intersection point of the impedance curve of user 3 and the constant wind pressure line segment, and the slopes of the impedance curves of user 1, user 2, and user 3 decrease in sequence. The slope of the impedance curve of the user 1 is the largest, the effective air output by the cigarette machine is the smallest, and the effective air output is in a first air setting interval [0, 11], and in the first air setting interval, the wind pressure of the cigarette machine of the user 1 can be maintained in a setting range of 550Pa, namely [500, 600] by adopting the wind pressure control program. The slope of the impedance curve of the user 2 is larger than that of the user 3, the effective air volume output by the user 2 is sequentially reduced but is in a second air volume setting interval (11, 15), and in the second air volume setting interval, the air pressure of the smoke machines of the users 2 and 3 can be maintained in a setting range of 350Pa, namely 300, 400, by adopting the air pressure control program, so that the change of the external load in the air volume setting interval does not influence the stable output of the air pressure, and the stage constant air pressure is realized.
Comparing before and after optimization, the wind pressure of the users 1 to 3 before optimization is reduced in sequence, and the wind pressure of the users in the same wind volume setting interval in the users 1 to 3 after optimization is constant. The actual wind pressure after the user 1/2/3 optimizes is all greater than the wind pressure before optimizing.
According to the embodiment of the invention, the staged constant wind pressure is realized through the staged constant wind pressure control logic, and it can be understood that the parameter control logic can also be applied to other products of the same type. Those skilled in the art will appreciate that residential kitchen exhaust pressure is selected with the goal of meeting kitchen exhaust requirements. The exhaust pressure is too small, the oil smoke can escape, and the kitchen has peculiar smell. But it is not better that bigger is bigger, the exhaust pressure is too big, and the fan energy consumption and noise in the kitchen room will also increase. According to the embodiment of the invention, the fan characteristic curve is optimized through program control according to the actual use requirements of users, so that the wind pressure of high-rise users is reduced, the noise is reduced and the smoking effect of low-rise users is ensured on the basis of ensuring that the use requirements of users on each floor are met.
An embodiment of the present invention further provides a wind pressure control device for a cigarette making machine, where the cigarette making machine includes a fan, and as shown in fig. 5, the wind pressure control device includes: the data acquisition module 10 is used for acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring a fan air volume value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan; the data detection module 20 is configured to determine a target air volume setting interval to which the fan air volume value belongs and a corresponding air pressure setting value, and determine the air pressure setting value as the target air pressure setting value when the total pressure at the fan outlet exceeds the setting range of the air pressure setting value; and the data adjusting module 30 is configured to obtain a target frequency of the fan according to the common flue pressure and the target wind pressure setting value, and adjust the target frequency.
The optional data acquisition module 10 comprises:
the acquisition submodule is used for acquiring the actual frequency f0 of the fan and the full pressure P of the outlet of the fan at the current momentT0；
The first operation submodule is used for calculating the actual rotating speed n0 of the fan to be mu (f0) according to the formula (1) and calculating the fan air quantity value Q0 to be G (n0, P) according to the formula (2)T0) Calculating the common flue pressure P0 ═ P according to the formula (3)T0-αQ02；
n＝μ(f) (1)；
Q＝G(n，PT) (2)；
Wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, and A is the sectional area of the branch pipe of the cigarette machine.
The optional data conditioning module 30 includes:
a second operation submodule for calculating the target wind pressure set value PTsetAnd the public cigaretteThe channel pressure P0 is calculated according to the formula (3) and reaches the target wind pressure set value P under the common flue pressure P0TsetThe required fan demand air quantity Q1,
determining to obtain the target frequency of the fan;
and the adjusting submodule is used for adjusting the frequency of the fan to be the target frequency of the fan.
Optionally, the method further comprises: and the circulation control module 40 is configured to, if the full pressure at the outlet of the fan is within the set range of the wind pressure set value, or the fan is adjusted according to the target frequency of the fan, extend the set time length and then start the wind pressure control process again.
Accordingly, the control logic of the frequency conversion scheme of the wind pressure control device is as follows:
step 1: acquiring a frequency f0 at a time t0, and obtaining the fan speed n0 at the time as mu (f0) according to the formula (1);
step 2: collect fan export full pressure P this momentT0The fan air volume Q0 at this time is G (n0, P) obtained from equation (2)T0)；
Step 3: the wind quantity Q0 and the wind pressure P at the moment are measuredT0With the set value Q of air quantityset1And the wind pressure set value PTset1And (3) comparison:
if the air quantity Q0 and the air quantity set value Qset1Is within its corresponding error range, and the wind pressure PT0With the wind pressure set value PTset1The difference is within the corresponding error range, the Step is ended, and the Step is restarted from Step1 at the next time t0+ delta t;
if only the air quantity Q0 and the air quantity set value Q are usedset1Within the corresponding error range, the target wind pressure set value P is madeTset＝PTset1And performing Step 5; otherwise, performing Step 4;
step 4: air quantity Q0 and air quantity set value Qset2Is within its corresponding error range,
if the wind pressure PT0With the wind pressure set value PTset2Is in the difference ofWithin the corresponding error range, ending the Step, and restarting from Step1 at the next time t0+ Δ t;
if the wind pressure PT0With the wind pressure set value PTset2The difference value exceeds the corresponding error range, and the target wind pressure set value P is enabled to beTset＝PTset2And performing Step 5;
step 5: the common flue pressure P0 at this time is calculated from equation (3) to be PT0-αQ02Therefore, the external pressure P0 can be obtained, and the wind pressure set value P is reachedTsetThe required air volume Q1 of (a),
step 6: determining the required rotating speed of the fan under the external pressure as n1 ═ G-1 Q1(PTset) Further, from (1), the target value of the fan frequency adjustment is obtained as f1 ═ μ-1(n1)；
Step 7: at the next time t0+ Δ t, it restarts at Step 1.
In this embodiment, realize the output of the permanent effective wind pressure of stage nature through the cigarette machine of wind pressure feedback sensing control, specific target amount of wind that the cigarette machine was located sets for the interval in, no matter how external load changes, the homoenergetic wind pressure all can be realized, consequently can satisfy under the different operating modes the invariable stage nature of effective wind pressure of user's demand unchangeable, realizes stage nature constant wind pressure, has improved the smoking effect, has realized the wind pressure control.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A wind pressure control method of a cigarette making machine is characterized in that the cigarette making machine comprises a fan, and the wind pressure control method comprises the following steps:
acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring a fan air quantity value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan;
determining a target air volume setting interval to which the fan air volume value belongs and a corresponding air pressure setting value, and determining the air pressure setting value as the target air pressure setting value when the full pressure of the fan outlet exceeds the setting range of the air pressure setting value;
and obtaining the target frequency of the fan according to the common flue pressure and the target wind pressure set value and adjusting the target frequency.
2. The wind pressure control method according to claim 1, wherein obtaining the frequency of the fan and the outlet full pressure of the fan, and obtaining the fan wind value and the common flue pressure according to the fan frequency and the outlet full pressure of the fan comprises:
acquiring the actual frequency f0 of the fan at the current moment, and calculating the actual rotating speed n0 of the fan to be mu (f0) according to a formula (1);
acquiring the total pressure P of the outlet of the fan at the current momentT0According to the actual rotating speed n0 of the fan and the full pressure P of the outlet of the fanT0Calculating according to the formula (2) to obtain the fan air volume value Q0 ═ G (n0, P)T0) According to the fan outlet full pressure PT0And the fan air quantity value Q0 is calculated according to the formula (3) to obtain the common flue pressure P0 ═ PT0-αQ02；
n＝μ(f) (1)；
Q＝G(n，PT) (2)；
Wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, and A is the sectional area of the branch pipe of the cigarette machine.
3. The wind pressure control method according to claim 2, wherein obtaining and adjusting the target frequency of the fan according to the common flue pressure and the target wind pressure setting value comprises:
according to the target wind pressure set value PTsetAnd the common flue pressure P0 is calculated according to the formula (3) to obtain the set value P of the target wind pressure under the common flue pressure P0TsetThe required fan demand air quantity Q1,
determining to obtain the target frequency of the fan;
and adjusting the frequency of the fan to the target frequency of the fan.
4. The wind pressure control method according to claim 1, further comprising: and if the full pressure of the outlet of the fan is within the set range of the wind pressure set value, or the fan is adjusted according to the target frequency of the fan, the wind pressure control process is restarted after the set time length is prolonged.
5. The utility model provides a wind pressure controlling means of cigarette machine which characterized in that, the cigarette machine includes the fan, and this wind pressure controlling means includes:
the data acquisition module is used for acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring the air quantity value of the fan and the pressure of a public flue according to the frequency of the fan and the outlet full pressure of the fan;
the data detection module is used for determining a target air volume setting interval to which the fan air volume value belongs and a corresponding air pressure setting value, and determining the air pressure setting value as the target air pressure setting value when the full pressure of the fan outlet exceeds the setting range of the air pressure setting value;
and the data adjusting module is used for obtaining the target frequency of the fan according to the public flue pressure and the target wind pressure set value and adjusting the target frequency.
6. The wind pressure control device according to claim 5, wherein the data acquisition module comprises:
the acquisition submodule is used for acquiring the actual frequency f0 of the fan and the full pressure P of the outlet of the fan at the current momentT0；
The first operation submodule is used for calculating the actual rotating speed n0 of the fan to be mu (f0) according to the formula (1) and calculating the fan air quantity value Q0 to be G (n0, P) according to the formula (2)T0) Calculating the common flue pressure P0 ═ P according to the formula (3)T0-αQ02；
n＝μ(f) (1)；
Q＝G(n，PT) (2)；
Wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, and A is the sectional area of the branch pipe of the cigarette machine.
7. The wind pressure control apparatus according to claim 6, wherein the data adjusting module comprises:
a second operation submodule for calculating the target wind pressure set value PTsetAnd the common flue pressure P0 is calculated according to the formula (3) to obtain the set value P of the target wind pressure under the common flue pressure P0TsetThe required fan demand air quantity Q1,
determining to obtain the target frequency of the fan;
and the adjusting submodule is used for adjusting the frequency of the fan to be the target frequency of the fan.
8. The wind pressure control apparatus according to claim 5, further comprising: and the circulation control module is used for restarting the wind pressure control process after the set time length is prolonged if the full pressure of the fan outlet is within the set range of the wind pressure set value or the fan is adjusted according to the target frequency of the fan.
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