CN112169207A - Automatic air quantity speed regulating method - Google Patents
Automatic air quantity speed regulating method Download PDFInfo
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- CN112169207A CN112169207A CN202011057669.6A CN202011057669A CN112169207A CN 112169207 A CN112169207 A CN 112169207A CN 202011057669 A CN202011057669 A CN 202011057669A CN 112169207 A CN112169207 A CN 112169207A
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- fan
- air
- rotating speed
- speed
- air supply
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B9/00—Component parts for respiratory or breathing apparatus
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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
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- Engineering & Computer Science (AREA)
- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention relates to the technical field of respirators, and discloses an automatic air quantity speed regulating method, which comprises the following steps: the main machine body is internally provided with an air supply channel, a fan is arranged in the air supply channel, and the automatic air quantity speed regulation method comprises the following steps: according to actual measurement, obtaining rotating speed set values of the fan corresponding to different air volume set values; when the external air resistance is increased, the rotating speed of the fan is reduced, the driving current of the fan is changed, the rotating speed of the fan cannot reach the set rotating speed, and the MCU automatically increases the driving current of the fan and improves the rotating speed of the fan; and when the external air resistance is reduced, the MCU automatically reduces the fan driving current and reduces the fan rotating speed. The automatic air quantity speed regulating method provided by the technical scheme of the invention has the advantages of stable air quantity of the fan, good air supply effect and convenience in use.
Description
Technical Field
The invention relates to the technical field of respirators, in particular to an automatic air volume speed regulating method.
Background
In the fields of industry, medical use and the like, it is often necessary to work in an environment such as a sterile environment or a dust-free environment, and a respirator has been developed because it is necessary to purify air to be inhaled in order to prevent workers from inhaling dust or germs. The respirator is generally provided with a filter element, air passing through the respirator can firstly pass through the filter element, and dust or germs can be removed from the air passing through the filter element so as to be inhaled by workers.
In addition, in order to facilitate the working of the staff in the whole-body closed environment, an air-supplying respirator is provided, which is communicated with the inside of the protective clothing in a pipeline manner, sucks air through a motor and sends the air into the protective clothing.
However, in the use process, the condition that a circulation pipeline of air is blocked or the filter element gap is blocked by dust and the like exists, so that the rotating speed of the motor is reduced, the air volume of blown air is not constant, the air supply effect is poor, and the use is inconvenient.
Disclosure of Invention
The invention aims to provide an automatic air quantity speed regulating method, and aims to solve the problems that the air quantity of blown air is not constant and the air supply effect is poor in the prior art.
The invention is realized in such a way that an automatic air quantity speed regulation method comprises the following steps: the main machine body is internally provided with an air supply channel, a fan is arranged in the air supply channel, and the automatic air quantity speed regulation method comprises the following steps:
according to actual measurement, obtaining rotating speed set values of the fan corresponding to different air volume set values;
when the external air resistance is increased, the rotating speed of the fan is reduced, the driving current of the fan is changed, the rotating speed of the fan cannot reach the set rotating speed, and the MCU automatically increases the driving current of the fan and improves the rotating speed of the fan;
and when the external air resistance is reduced, the MCU automatically reduces the fan driving current and reduces the fan rotating speed.
Optionally, the method further comprises the following steps:
when the fan rotates, a Hall element outputs a Hall signal;
and the MCU detects the period and the frequency of the Hall signal and calculates the current rotating speed of the fan.
Optionally, after the driving current of the fan is increased to the maximum threshold, the MCU stops increasing the current and gives an alarm.
Optionally, when the fan stops running, an alarm is given.
Optionally, the driving current of the fan is obtained by sampling through a circuit.
Optionally, an air supply switch is arranged on the main body and used for adjusting the set rotating speed.
Optionally, an air supply channel is arranged in the main body, a buzzer is arranged in the air supply channel, and the buzzer gives an alarm for prompting.
Optionally, a light alarm structure is further arranged in the fan, and the light alarm structure alarms and lifts through light flashing.
Compared with the prior art, the speed regulating method for the automatic air volume provided by the invention has the advantages that when the external air resistance is increased, the rotating speed of the fan is reduced, the driving current of the fan is unstable, and the fan fluctuates up and down, so that the driving current is increased for compensation, the rotating speed of the fan is increased, on one hand, the wind power can be increased for blowing away the blockage, and on the other hand, when the main machine body is used, the air volume of the fan is stable, and the air supply effect is good; similarly, when the external air resistance is reduced, the rotating speed of the fan is increased, and at the moment, the driving current is reduced, so that the air volume is stable, and the fan is convenient to use. The problems that in the prior art, the wind speed of blown wind is not constant and the air supply effect is poor are solved.
Drawings
FIG. 1 is a schematic flow chart of an automatic air volume speed regulating method according to the present invention;
FIG. 2 is a schematic perspective view of a filter element mounted on a main body according to the method for regulating air flow rate automatically provided by the present invention;
FIG. 3 is an exploded view of a filter element installed on a main body according to the method for regulating the speed of an automatic air flow provided by the present invention;
fig. 4 is a schematic perspective view of a canister mounted on a main body according to the automatic air volume speed control method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1, a preferred embodiment of the present invention is shown.
In the embodiment of the invention, the automatic air quantity speed regulating method comprises the following steps: the main body 10, there is the air supply channel in the main body 10, is equipped with the fan 114 in the air supply channel, the speed governing method of the automatic amount of wind step as follows:
according to actual measurement, obtaining the rotating speed set values of the fan 114 corresponding to different air volume set values;
when the external air resistance is increased, the rotating speed of the fan is reduced, the driving current of the fan 114 is changed, the rotating speed of the fan cannot reach the set rotating speed, and the MCU automatically increases the driving current of the fan 114 and increases the rotating speed of the fan;
when the external air resistance is reduced, the MCU automatically reduces the driving current of the fan 114 and reduces the rotating speed of the fan 114.
The MCU, namely the singlechip, is a control element arranged on the main control board.
In this embodiment, a filtering structure is disposed in the main body 10, the fan 114 is connected to the fan wheel, the fan wheel and the filtering structure are arranged relatively, and the fan 114 further has an air supply opening for connecting the air supply duct 30, so that the filtered air is supplied along the air supply passage and the air supply duct 30, the other end of the air supply duct 30 is connected to the head cover, the head cover has an air guide passage therein, the tail of the head cover has an air inlet, the head of the head cover has an air outlet, the air inlet and the air outlet are communicated through the air guide passage, and the other end of the air supply duct 30 is connected to the air inlet to blow air from the air outlet. The above-mentioned external air resistance is increased, for example, when the gap of the filter structure is clogged with dust, or when the air supply passage, the air supply duct 30, or the air guide passage is clogged.
In this embodiment, when the external air resistance increases, the rotation speed of the fan 114 decreases, and the driving current of the fan 114 is unstable, and fluctuates up and down, so that the driving current is increased to compensate, so as to increase the rotation speed of the fan 114, on one hand, the wind power can be increased to blow away the blockage, and on the other hand, when the main body 10 is in use, the wind volume of the fan 114 is stable, and the air supply effect is good; similarly, when the external air resistance is reduced, the rotation speed of the fan 114 is increased, and at this time, the driving current is reduced, so that the air volume is stabilized for use.
In the invention, during actual measurement, in order to obtain the set value of the air volume, the air volume can be detected at the air supply port through an air velocity tester to obtain the air velocity, and the air volume is calculated according to the section of the air supply port.
Referring to fig. 1, in an embodiment of the present invention, the method for automatically adjusting the air flow rate further includes the following steps:
when the fan 114 rotates, a hall element outputs a hall signal;
the MCU detects the period and frequency of the hall signal and calculates the current speed of the fan 114.
The hall signal, i.e., the rotor position signal of the fan 114, detects the period and frequency of the hall signal through the MCU, and further obtains the current rotation speed of the fan 114, and then calculates the current to be compensated or the reduced current according to the rotation speed set by the fan 114, and the amount of air blown by the fan 114 can be kept stable by changing the current.
In this embodiment, the driving current of the fan 114 is obtained by circuit sampling.
That is, during the rotation of the fan 114, the driving current of the fan 114 can be obtained by collecting the current input to the fan 114, so as to calculate the compensation current or the reduction current. The above-mentioned rotational speed of detecting the fan 114 and the collection of the driving current are all carried out in real time, so that in the whole process of the rotation of the fan 114, the current changes in real time, so that the air volume blown out by the fan 114 is kept stable.
Referring to fig. 1, in an embodiment of the invention, after the driving current of the fan 114 is increased to the maximum threshold, the MCU stops increasing the current and performs an alarm prompt.
When the driving current of the fan 114 is high, if the driving current is continuously increased, a danger may occur, for example, the filter structure is completely blocked, and at this time, the current increase is stopped, and an alarm prompt is performed to inform a user of attention, so as to repair the main body 10 in time.
Further, when the driving current of the fan 114 increases to the maximum threshold value, the rotation of the fan 114 is stopped.
In order to avoid the idle running of the fan 114 and the danger of overheating, when the driving current is increased to the maximum threshold value, the fan 114 stops rotating, the danger is relieved, and the working safety of users is guaranteed.
In addition, when the fan 114 is stopped, an alarm is given.
When the fan 114 stops, that is, the fan 114 is jammed, an alarm prompt is given to avoid danger, and a user is informed to maintain the fan in time.
Referring to fig. 2 to 4, in an embodiment of the present invention, the main body 10 has an air supply switch 102, and the air supply switch 102 is used for adjusting the set rotation speed.
Specifically, a main control board is disposed on the main body 10, the main control board is electrically connected to the fan 114, an air supply switch 102 and a power switch 101 are disposed on the main control board, the power switch 101 is used for turning on and off a power supply, the air supply switch 102 is used for turning on the fan 114, and the set rotating speed of the fan 114 is gradually increased along with the increase of the number of times of pressing keys, and finally, the main control board is pressed again, that is, the fan 114 is turned off, and the operation is sequentially performed.
Referring to fig. 2 to 4, in an embodiment of the present invention, an air supply channel is disposed in the main body 10, and a buzzer is disposed in the air supply channel and gives an alarm to prompt.
In this embodiment, when the main body 10 is abnormal, the buzzer will send an alarm to remind the user to pay attention, and because the buzzer is disposed on the sidewall of the air supply channel, the alarm sound sent by the buzzer will be transmitted to the closed environment of the user along with the air supply channel, thereby avoiding the situation that the user does not pay attention to the alarm due to the noisy external environment.
The air supply channel comprises an air suction part and an air supply part, the air suction part is arranged on the air impeller, the air suction part is communicated with the air supply part, the air supply part is arranged around the air suction part, the air supply part is gradually far away from the center of the air suction part, and the end part of the air supply part far away from the adsorption part is communicated with the air supply opening.
Like this, the impeller rotates in the portion of induced drafting, inhales wind, then send wind to the air supply portion, and then the realization is bloied, and is concrete, and this impeller includes preceding aerofoil and back aerofoil, has the flabellum that a plurality of intervals and slope were arranged between preceding aerofoil and the back aerofoil, and the middle part of preceding aerofoil and back aerofoil link up, and the pivot of the host computer body 10 is connected in back aerofoil promptly, and like this, the middle part of this impeller is air inlet department, and the periphery is air-out department to make the air supply efficiency of supply-air outlet higher.
In addition, the buzzer is arranged on the side wall of the air suction part.
Because the impeller is the periphery air-out, in order to avoid the influence of air-out to bee calling organ, locate the lateral wall of portion of induced drafting with bee calling organ, guaranteed bee calling organ's normal use.
Furthermore, a groove 112a is formed on the side wall of the air suction part, and the buzzer is fixed in the groove 112 a.
Therefore, the buzzer is prevented from being scratched by the wind impeller in the rotating process, and the normal use of the buzzer is further ensured. Specifically, the suction portion has an annular groove which is disposed opposite to the impeller and to which the groove 112a communicates.
Of course, in other embodiments, the buzzer may be disposed at the air supply part according to the use requirement, and will not be described again.
On the basis of the above embodiment, the sidewall of one side of the groove 112a has a through hole, the main control board is electrically connected with the buzzer through a wire harness, and the wire harness passes through the through hole.
Thus, the electrical connection of the buzzer is realized, and because the buzzer is positioned at the air suction part, the air blown out by the air impeller can not pass through the through hole, and the normal air supply of the main machine body 10 is ensured.
In this embodiment, the top in the main engine body 10 is located to the main control board, is equipped with switch 101 and air supply switch 102 on the main control board respectively, controls switching power supply and wind impeller's rotation respectively, and switch 101 and air supply switch 102 all are located the main engine body 10 top, and above-mentioned recess 112a also is located the position that the adsorption part is close to in the main engine body 10 top, and the through-hole of recess 112a lateral wall also arranges up to the connection of pencil is convenient for.
Referring to fig. 2 to 4, in an embodiment of the present invention, the main body 10 includes a body 11 and a casing 12, the body 11 has a filter cell 11a, the body 11 is detachably connected to the casing 12, and the casing 12 covers the filter cell 11a and forms a filter cavity;
the filter structure is a filter element 121, the filter element 121 is arranged in the filter cavity,
alternatively, the filter structure is a canister 122, and the canister 122 is attached to the outside wall of the housing 12.
Therefore, the main body 10 can be compatibly provided with the filter element 121 or the filter tank 122, the use is more convenient, and the middle part of the bottom of the filter tank 11a is provided with the vent hole, and the vent hole is provided with the fan wheel, so that air enters the filter cavity through the filter element 121 or the filter tank 122, is sucked through the fan wheel and then is blown out, and air supply is realized.
In this embodiment, the machine body 11 includes a front shell 111, an inner shell 112, and a rear shell 113, the front shell 111 is connected to the rear shell 113, the inner shell 112 is located between the front shell 111 and the rear shell 113, the front shell 111 and the inner shell 112 are connected to form an air supply channel, the front shell 111 is formed with a filter cell 11a, and the rear shell 113 is formed with a groove 112 a.
The front shell 111 and the rear shell 113 are connected by screws after being butted, the front shell 111 and the inner shell 112 are also fixed by screws after being butted, and the rear shell 113 forms the annular groove and the groove 112a so as to facilitate the wiring harness to pass through.
Also, a gap is provided between the wind impeller and the rear case 113.
Therefore, the stable rotation of the fan impeller is ensured, and the buzzer is ensured to penetrate out sound from the gap to the air supply outlet and then be transmitted to the closed space of a user, so that the detection and the alarm are facilitated.
Referring to fig. 2 to 4, in an embodiment of the present invention, a light alarm structure is further disposed in the main body 10.
This light alarm structure is a set of LED lamp, with above-mentioned main control board electric connection, when the unusual state of work appears, realizes the alarm suggestion through light alarm structure scintillation to further remind the user of service.
In addition, in another embodiment, a vibration motor may be further disposed in the main body 10, and the vibration motor is electrically connected to the main control board, so that when the main body 10 is in an abnormal working state, the vibration motor vibrates to remind a user.
Referring to fig. 2 to 4, in an embodiment of the invention, the abnormal operation state further includes whether the filter element 121 is installed, in order to detect whether the filter element 121 is installed or not, a first detection contact is disposed at a bottom of the filter tank 11a, a detection chip is disposed on the filter element 121, the detection chip has a second detection contact, and the second detection contact is in contact with the first detection contact.
Through the contact that detects second detection contact and first detection contact on the detection chip, and then can learn that filter core 121 has installed in the filter chamber, the non-vacant state of filter chamber can normally supply air, and when first detection contact does not detect the contact with the second, first detection contact is vacant arrangement state, indicates no filter core 121 in the filter chamber this moment promptly to and remind the staff in time to place filter core 121, avoid taking place danger.
In this embodiment, the detection structure is a detection circuit board, the detection circuit board is provided with a detection chip, the detection chip stores information of the effective time of the filter element 121, and the detection circuit board is provided with two second detection contacts arranged at intervals; the first detection contact is a contact pin, the bottom of the filter tank 11a is provided with two first detection contacts arranged at intervals, each second detection contact is butted with one first detection contact, and the main control board is electrically connected with the detection circuit board.
That is, when the filter element 121 is not installed, the end of the contact pin is disposed in an empty position, which means that the filter element 121 is not installed, and when the filter element 121 is installed, the main control board is electrically connected to the detection circuit board, which means that the filter element 121 is installed, so as to implement the detection. In particular, the contact pin is an elastic contact pin to ensure a stable interference with the second detection contact.
Meanwhile, after the filter element 121 is installed, the information of the effective time of the filter element 121 of the detection chip is read through the main control board, whether the filter element 121 is in the effective period or not is judged, if the effective period is exceeded, quality problems such as blockage and the like may exist in the filter element 121, and at the moment, a worker is reminded to replace the filter element 121 in time. In addition, after the detection is passed, that is, the filter element 121 is installed, and in the effective time, the service life of the filter element 121 can be written into the main control board through the detection chip, and when the service life of the filter element 121 reaches the preset time, early warning is performed.
In addition, in order to ensure normal use of the canister 121 and prevent random alarming, a detection structure is also provided on the corresponding housing 12, and the structure thereof refers to the detection structure of the filter element 121, and is not described again.
Referring to fig. 2 to 4, in an embodiment of the present invention, a rotatable wind direction adjusting sheet is disposed at the wind outlet of the head cap.
Specifically, be equipped with two supports in the both sides of air outlet, the both ends protrusion of wind direction adjustment piece has the regulation to rotate the arch, adjusts to rotate protruding embedding and realize rotating in the downthehole of support, through rotating the wind direction adjustment piece, the adjustable wind direction of the air that blows off from the air outlet to it is more comfortable, convenient to use. And, each end of wind direction adjustment sheet has first regulation stopper and second regulation stopper respectively, and it has the limiting plate to correspond, and the support epirelief, the wind direction adjustment sheet is rotating the in-process, and first regulation stopper or second are adjusted the stopper and can be supported on the limiting plate to rotate to this wind direction adjustment sheet and carry on spacingly. Because the air output of the fan 114 is stable, the air output will not change due to the change of the adjusting sheet, and the air blowing effect is better.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. An automatic air quantity speed regulation method is characterized by comprising the following steps: the main machine body is internally provided with an air supply channel, a fan is arranged in the air supply channel, and the automatic air quantity speed regulation method comprises the following steps:
according to actual measurement, obtaining rotating speed set values of the fan corresponding to different air volume set values;
when the external air resistance is increased, the rotating speed of the fan is reduced, the driving current of the fan is changed, the rotating speed of the fan cannot reach the set rotating speed, and the MCU automatically increases the driving current of the fan and improves the rotating speed of the fan;
and when the external air resistance is reduced, the MCU automatically reduces the fan driving current and reduces the fan rotating speed.
2. The automatic air volume speed regulation method according to claim 1, characterized by further comprising the following steps:
when the fan rotates, a Hall element outputs a Hall signal;
and the MCU detects the period and the frequency of the Hall signal and calculates the current rotating speed of the fan.
3. The automatic air volume speed regulating method according to claim 1 or 2, wherein when the driving current of the fan is increased to the maximum threshold, the MCU stops continuously increasing the current and gives an alarm prompt.
4. The automatic air volume speed regulating method according to claim 1 or 2, characterized in that when the fan stops, an alarm prompt is given.
5. The automatic air quantity speed regulating method according to claim 3, wherein the driving current of the fan is obtained by circuit sampling.
6. The speed regulating method for the automatic air volume according to claim 1 or 2, characterized in that an air supply switch is arranged on the main machine body and used for regulating the set rotating speed.
7. The method for automatically adjusting the speed of air volume according to claim 1 or 2, wherein an air supply channel is arranged in the main body, a buzzer is arranged in the air supply channel, and the buzzer gives an alarm for prompting.
8. The automatic speed regulating method for the air quantity according to claim 1 or 2, characterized in that a light alarm structure is further arranged in the fan, and the light alarm structure gives an alarm by means of light flashing.
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| CN202011057669.6A CN112169207B (en) | 2020-09-29 | 2020-09-29 | Automatic air quantity speed regulating method |
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| CN202011057669.6A CN112169207B (en) | 2020-09-29 | 2020-09-29 | Automatic air quantity speed regulating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113304412A (en) * | 2021-04-08 | 2021-08-27 | 中国辐射防护研究院 | Method and device for adjusting feedback of internal environment of power air supply type nuclear biochemical protective clothing |
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| CN210565262U (en) * | 2019-05-27 | 2020-05-19 | 肇庆晟辉电子科技有限公司 | Speed-regulating fan |
| CN111059736A (en) * | 2019-12-04 | 2020-04-24 | 珠海格力电器股份有限公司 | Constant air volume control method for air conditioning system |
| CN111298314A (en) * | 2020-03-20 | 2020-06-19 | 中山市赛恩电器科技有限公司 | Respiratory protection device and protection wearing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113304412A (en) * | 2021-04-08 | 2021-08-27 | 中国辐射防护研究院 | Method and device for adjusting feedback of internal environment of power air supply type nuclear biochemical protective clothing |
| CN113304412B (en) * | 2021-04-08 | 2022-09-27 | 中国辐射防护研究院 | Method and device for adjusting feedback of internal environment of power air supply type nuclear biochemical protective clothing |
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