CN115942721A - Dust-free fresh air device for frequency converter room and control method thereof - Google Patents
Dust-free fresh air device for frequency converter room and control method thereof Download PDFInfo
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Abstract
The invention relates to a dust-free fresh air device for a frequency converter room and a control method thereof. The dust-free fresh air device comprises an air supply mechanism, a cooling and dedusting mechanism, an air exhaust mechanism, a plurality of detection elements and a controller. The air supply mechanism is communicated with the frequency converter chamber and is used for conveying air into the frequency converter chamber. The cooling and dust removing mechanism is arranged in the air supply mechanism. The air exhaust mechanism is communicated with the frequency converter chamber and is used for exhausting air to the outside of the frequency converter chamber. A plurality of detection elements are used to collect characteristic data of the transducer chamber. According to the collected characteristic data, the adaptive air inlet and outlet rates are calculated through the controller, and the air supply mechanism and the air outlet mechanism are controlled to be installed and operated at corresponding rates, so that the air pressure and the temperature in the frequency converter chamber reach the set ideal values and are kept constant. The invention fully considers the heat produced by the frequency converter in the operation process, does not need to adjust the air inlet speed or the air outlet speed in real time, can reduce the adjusting steps, improves the adjusting efficiency and reduces the energy consumption.
Description
Technical Field
The invention relates to a dust-free fresh air device, in particular to a dust-free fresh air device for a frequency converter room and a control method of the dust-free fresh air device for the frequency converter room.
Background
In the running process of the frequency converter, the ambient temperature is required to be 10-40 ℃, the ambient air does not contain high-concentration dust, inflammable and explosive gas or dust, and a strong electromagnetic radiation source is not arranged nearby. Due to the power losses inside the frequency converter, heat is dissipated during its operation. Therefore, it is necessary to control the temperature of the inverter chamber so that the ambient temperature around the inverter is controlled within an allowable range. Otherwise, the over-high ambient temperature may cause tripping of the frequency converter due to over-temperature protection, which may affect normal use and even shorten the service life of the frequency converter.
The existing temperature control of the frequency converter chamber usually adopts an air interchanger or a vent, even adopts an air conditioner to reduce the temperature, so that the frequency converter operates at a proper environmental temperature. Although the temperature of the frequency converter can be controlled in the prior art, because the adjustment process is usually adjusted according to a certain temperature range (such as 15-35 ℃), when the indoor temperature approaches a critical value (such as 35 ℃), the adjustment process is usually represented as multiple times of slow adjustment, and the energy consumption required by adjustment is high. If the rate of temperature regulation is suddenly increased, the indoor air pressure changes too much, and the workers cannot stay for a long time. Meanwhile, a certain amount of dust is often contained near the frequency converter chamber, and if the dust content in the operating environment of the frequency converter is too high, the maintenance frequency of a ventilating device of the frequency converter and the like is directly increased, and even the frequency converter is stopped to blow dust regularly, so that the production is influenced.
Disclosure of Invention
Therefore, it is necessary to provide a dust-free fresh air device for a frequency converter room and a control method thereof, aiming at the problems of slow regulation rate and high energy consumption of the temperature and the air pressure in the existing frequency converter room.
The invention is realized by the following technical scheme: a dustless new trend device that converter room was used includes: the device comprises at least one air supply mechanism, a cooling and dedusting mechanism, a first flowmeter, at least one exhaust mechanism, a second flowmeter, a plurality of temperature sensors, at least one pressure sensor and a controller, wherein the cooling and dedusting mechanism corresponds to the air supply mechanism one to one.
The air supply mechanism is communicated with the frequency converter chamber and is used for conveying air outside the frequency converter chamber to the frequency converter chamber. The first flowmeter is arranged in the air supply mechanism and is used for measuring the intake flow Q passing through the air supply mechanism in real time I . The cooling and dust removing mechanism is arranged in the air supply mechanism and used for cooling and removing dust of air passing through the air supply mechanism. The air exhaust mechanism is communicated with the frequency converter chamber and is used for conveying air in the frequency converter chamber to the outside of the frequency converter chamber. The second flowmeter is arranged in the exhaust mechanism and used for measuring the air outlet flow Q passing through the exhaust mechanism in real time O . Multiple temperature sensors respectively arranged in the frequency converter chamber, the air supply mechanism and the air exhaust mechanism for measuring average temperature T of air in the frequency converter chamber A Temperature T of inlet air I And the outlet air temperature T O . The pressure sensor is arranged in the frequency converter chamber and is used for measuring the average air pressure P of the air in the frequency converter chamber A 。
The controller comprises a storage module, a wind speed identification module, an ideal data generation module, a heat speed identification module and a regulation module. The storage module is used for receiving, transmitting and storing the air inlet flow Q I And the air outlet flow Q O Average temperature T A And the temperature T of the inlet air I And outlet air temperature T O And average gas pressure P A . The wind speed identification module is used for calculating corresponding wind inlet speed and wind outlet speed according to the ratio of the wind inlet flow and the wind outlet flow to the measurement time. The ideal data generation module is used for generating an ideal temperature T according to a preset temperature range and an air pressure range H And ideal air pressure P H 。
The adjusting module is used for: 1. calculating the ideal temperature T of the frequency converter chamber within a regulation period T, wherein the average temperature and the average air pressure respectively reach the ideal temperature T H And ideal gas pressure P H Velocity v of air intake I1 And the air-out velocity v O1 . Wherein the air intake velocity v I1 And the air-out velocity v O1 Calculated by the following formula:
v I1 ＝[T H V-22.4T O1 (n H -n 0 )]/[S 1 t(T I1 -T O1 )]。
v O1 ＝[T H V-22.4T I1 (n H -n 0 )]/[S 2 t(T I1 -T O1 )]。
wherein V is the total volume of air in the frequency converter room, n H To achieve the desired temperature T H And ideal air pressure P H Mass of air in a time-frequency converter room, n 0 Is the amount of material of the air in the current inverter room, and n H -n 0 ＝RT H /P H V-RT A /P A V，T I1 Is the average inlet air temperature, T, over a period of time O1 Is the average outlet air temperature, S, over a period of time 1 Is the cross-sectional area of the intake air, S 2 Is the air outlet cross-sectional area.
2. According to the heat output speed v of all frequency converters in the frequency converter room Q Calculating the air intake velocity v when the constant temperature condition is satisfied I2 And the air outlet velocity v O2 . Wherein the adjusted air intake speed v I2 And the air outlet velocity v O2 Are expressed as:
v I2 ＝v Q VP O2 T I2 /[S 1 (P I2 T O2 2 -P O2 T I2 2 )]；
v O2 ＝v Q VP I2 T O2 /[S 2 (P I2 T O2 2 -P O2 T I2 2 )]；
in the formula, T I2 Is the average inlet air temperature, T, at constant temperature O2 Is the average outlet air temperature under constant temperature condition, P I2 Is the average intake air pressure under constant temperature, P O2 Is the average outlet air pressure under the constant temperature condition.
3. And respectively controlling the first fan and the second fan to operate according to the corresponding air inlet speed and air outlet speed.
The heat speed identification module is used for calculating the heat output speed according to the variable quantity of the air inlet speed, the air inlet temperature, the air outlet speed, the air outlet temperature and the average temperature and the variable quantity of the average air pressure. Wherein the heat output rate v Q Expressed as:
v Q ＝[V(T H -T A )+v O1 t 1 T O1 -v I1 t 1 T I1 ]/Vt 1 。
in the formula, t 1 To adjust the duration.
Above-mentioned dustless new trend device is through carrying out real-time measurement to atmospheric pressure and temperature in the converter room, and then according to the temperature of air inlet and air-out, calculates the air inlet and the air-out speed of adaptation to make atmospheric pressure and the temperature in the converter room remain throughout at predetermined within range, and then make the converter work under suitable temperature and low dust environment, prolong the life of converter. In addition, above-mentioned dustless new trend device has still fully considered the heat of converter in operation in-process output, after twice regulation, keeps indoor temperature of converter and atmospheric pressure invariable, need not to adjust air inlet speed or air-out speed in real time, can reduce the regulation step, improves regulation efficiency, reduces the energy consumption. In the air inlet process, the output power of the first fan is firstly set, and the air outlet direction and the air outlet area of the air outlet are matched and adjusted, so that air is introduced into the frequency converter chamber at the air inlet speed output by the controller. When air enters, dust in the air is filtered by the filter cotton, and then heat in the air is absorbed by the cooling pipe, so that the air is dedusted and cooled, and the adjusting rate is increased. Similarly, in the air outlet process, the output power of the second fan and the opening area of the electronic valve can be adjusted, so that the air is exhausted out of the frequency converter at the air outlet speed output by the controller.
In one embodiment, the air supply mechanism comprises an air supply pipeline and a first fan, wherein the air supply pipeline penetrates through the inner wall of the frequency converter chamber and is used for communicating air on the two sides inside and outside the frequency converter chamber. The first fan is arranged in the air supply pipeline and used for generating directional air flow so as to convey air outside the frequency converter chamber to the frequency converter chamber.
In one embodiment, the air outlet is a louver air outlet, and the air outlet is arranged at the joint of the air supply pipeline and the inner wall of the frequency converter chamber and used for adjusting the air inlet direction and the air inlet speed. Through adjusting the tripe wind gap to the higher region of the indoor temperature of orientation frequency converter, be favorable to the indoor rapid cooling of frequency converter.
In one embodiment, the temperature-reducing and dust-removing mechanism comprises filter cotton and a cooling pipe, wherein the filter cotton is arranged in one end of the air supply pipeline, which is far away from the frequency converter chamber, and is used for filtering dust in air. The cooling pipe is arranged in the air supply pipeline and is positioned between the filter cotton and the first fan and used for absorbing heat in the air. The cooling tube is filled with cooling liquid. Adopt cooling dust removal mechanism to cool down the dust removal to the air to when trading new trend to the converter room, reduce the indoor dust content of converter, provide the operational environment of preferred for the converter.
In one embodiment, the filter cotton is any one or more of synthetic fiber filter cotton, non-woven fabric filter cotton, glass fiber filter cotton and activated carbon filter cotton.
In one embodiment, the exhaust mechanism comprises an exhaust duct, a second fan and a fan cover. The fan housing is mounted on the inner wall of the frequency converter chamber. One end of the exhaust pipeline is communicated with the fan cover, and the other end of the exhaust pipeline penetrates through the frequency converter chamber. The second fan is arranged in the exhaust pipeline.
In one embodiment, the exhaust mechanism further comprises an electronic valve, and the electronic valve is mounted on the exhaust pipeline and used for controlling the on-off state of the exhaust pipeline.
The invention also provides a control method of the dust-free fresh air device for the frequency converter chamber, and the control method is used for the dust-free fresh air device. The control method comprises the following processes:
s1: characteristic data of the transducer chamber are collected.
S2: setting the ideal temperature T H And ideal air pressure P H . Adjusting the air inlet rate and the air outlet rate based on the characteristic data to make the average temperature and the average air pressure reach the ideal temperature T respectively H And ideal air pressure P H . Wherein the adjusted air intake speed v I1 And the air-out velocity v O1 Are expressed as:
v I1 ＝[T H V-22.4T O1 (n H -n 0 )]/[S 1 t(T I1 -T O1 )]
v O1 ＝[T H V-22.4T I1 (n H -n 0 )]/[S 2 t(T I1 -T O1 )]
wherein V is the total volume of air in the frequency converter room, n H To reach the ideal temperature T H And ideal air pressure P H Mass of air, n, in a time-frequency converter chamber 0 Is the amount of material of the air in the current inverter room, and n H -n 0 ＝RT H /P H V-RT A /P A V，T I1 Is the average inlet air temperature, T, over a period of time O1 Is the average outlet air temperature in a time period, S 1 Is the cross-sectional area of the inlet air, S 2 Is the air outlet cross-sectional area.
S3: calculating the heat output speed v when all the frequency converters in the frequency converter room run Q . And continuously adjusting the air inlet speed and the air outlet speed so as to keep the average temperature and the average air pressure constant. Wherein the heat output rate v Q Expressed as:
v Q ＝[V(T H -T A )+v O1 t 1 T O1 -v I1 t 1 T I1 ]/Vt 1 。
in the formula, t 1 To adjust the duration.
Adjusted air intake velocity v I2 And the air-out velocity v O2 Are expressed as:
v I2 ＝v Q VP O2 T I2 /[S 1 (P I2 T O2 2 -P O2 T I2 2 )]，
v O2 ＝v Q VP I2 T O2 /[S 2 (P I2 T O2 2 -P O2 T I2 2 )]。
in the formula, T I2 Is the average inlet air temperature T under the constant temperature and pressure state O2 Is the average outlet air temperature P under the constant temperature and pressure state I2 Is the average air pressure of inlet air under the constant temperature and pressure state, P O2 To keep constant temperature and pressureAverage outlet air pressure in the state.
In one embodiment, the characteristic data includes an intake air flow rate Q I And the air outlet flow Q O Temperature T of inlet air I Air outlet temperature T O Average temperature T A And average gas pressure P A . Wherein, the air intake rate v is calculated according to the air intake flow, the air outlet flow and the corresponding acquisition duration I And the air-out velocity v O . The velocity v of the intake air I And the air outlet velocity v O Are expressed as:
v I ＝ΔQ I /Δt，
v O ＝ΔQ O /Δt。
wherein, Δ t is the flow metering period, Δ Q I For the inlet flow in one flow metering cycle, Δ Q O The outlet air flow in one flow metering period is adopted.
In one embodiment, the air inlet rate and the air outlet rate are respectively adjusted to be as follows according to the interference of the temperature and the air pressure during air inlet and air outlet on the molar mass of the air:
in the formula, P I1 Is the average intake air pressure, P, over a period of time O1 Is the average outlet air pressure over a period of time.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the dust-free fresh air device, the air pressure and the temperature in the frequency converter chamber are measured in real time, and then the adaptive air inlet and outlet rates are calculated according to the air inlet and outlet temperatures, so that the air pressure and the temperature in the frequency converter chamber are always kept in a preset range, the frequency converter works in an appropriate temperature and low-dust environment, and the service life of the frequency converter is prolonged. In addition, the dust-free fresh air device fully considers the heat generated by the frequency converter in the operation process, the temperature and the air pressure in the frequency converter chamber are kept constant after two times of adjustment, the air inlet speed or the air outlet speed does not need to be adjusted in real time, the adjustment steps can be reduced, and the energy consumption is reduced. In the air inlet process, the output power of the first fan is firstly set, and the air outlet direction and the air outlet area of the air outlet are matched and adjusted, so that air is introduced into the frequency converter chamber at the air inlet speed output by the controller. When air enters, dust in the air is filtered by the filter cotton, and then heat in the air is absorbed by the cooling pipe, so that the air is dedusted and cooled, and the adjusting rate is increased. Similarly, in the air outlet process, the output power of the second fan and the opening area of the electronic valve can be adjusted, so that the air is exhausted out of the frequency converter at the air outlet speed output by the controller.
2. The invention can adjust the air inlet direction and the air inlet speed by installing the air outlet. When the frequency converter is operated for a long time, the ambient temperature of the frequency converter is obviously higher than the temperature of the surrounding area, the direction of the air outlet is adjusted to the corresponding frequency converter, the corresponding frequency converter can be cooled rapidly, the service life of the frequency converter is prolonged, and the cost of maintaining the frequency converter is reduced.
Drawings
FIG. 1 is a schematic sectional view of a dust-free fresh air device for a frequency converter room according to embodiment 1 of the present invention;
FIG. 2 is a schematic top sectional view of the dust-free fresh air device shown in FIG. 1;
FIG. 3 is a schematic view of the connection structure of the controller of the dust-free fresh air device in FIG. 1;
FIG. 4 is a schematic block diagram of a controller of the dust-free fresh air device of FIG. 1;
fig. 5 is a step diagram of a control method applied to the dust-free fresh air device in fig. 1.
Description of the main elements
The reference numbers in the figures are: 1. an air supply mechanism; 11. an air supply duct; 12. a first fan; 13. an air outlet; 2. an air exhaust mechanism; 21. an exhaust duct; 22. a second fan; 23. a fan housing; 24. an electronic valve; 3. a first flowmeter; 4. a second flowmeter; 5. a temperature sensor; 6. a pressure sensor; 7. a cooling and dedusting mechanism; 71. filtering cotton; 72. a cooling tube; 10. a frequency converter chamber; 20. and a frequency converter.
The invention is further described in detail by the main reference symbols in the above description and the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1 and fig. 2, fig. 1 is a schematic sectional view of a dust-free fresh air device for a frequency converter room according to embodiment 1 of the present invention; fig. 2 is a schematic top sectional view of the dust-free fresh air device in fig. 1. The dust-free fresh air device is used for conveying fresh air (fresh air) into the frequency converter chamber, discharging the original air in the frequency converter chamber, reducing the average temperature of the frequency converter chamber or keeping the average temperature in the frequency converter chamber within a preset range, reducing the dust content in the frequency converter chamber, optimizing the operating environment of the frequency converter and prolonging the service life of the frequency converter. Dustless new trend device includes: the device comprises at least one air supply mechanism 1, a temperature-reducing and dust-removing mechanism 7 corresponding to the air supply mechanism one by one, a first flowmeter 3, at least one air exhaust mechanism 2, a second flowmeter 4, a plurality of temperature sensors 5, at least one pressure sensor 6 and a controller (not shown).
The air blowing mechanism 1 communicates with the inverter chamber 10, and is configured to blow air outside the inverter chamber 10 into the inverter chamber 10. The air supply mechanism 1 comprises an air supply pipeline 11, a first fan 12 and an air outlet 13. The air supply duct 11 passes through the inner wall of the frequency converter chamber 10 and is used for communicating air on the inner side and the outer side of the frequency converter chamber 10. In the present embodiment, the air supply duct 11 is an "L" shaped pipe, one side of which is horizontally disposed and passes through the side wall of the inverter chamber 10, and the other side of which is located outside the inverter chamber 10 and opens downward. Of course, in other embodiments, the air supply duct 11 may be a pipe body having other shapes such as a straight pipe or a curved pipe as long as the inside and the outside of the frequency converter chamber 10 can be communicated.
A first fan 12 is installed in the supply duct 11, and the first fan 12 can generate a directional air flow so that air outside the inverter compartment 10 is supplied into the inverter compartment 10. Specifically, the first fan 12 is located in the air supply duct 11 outside the frequency converter chamber 10. In this embodiment, the first fan 12 is a variable frequency axial flow fan. The first fan 12 comprises a motor and an axial flow fan. The motor may be installed in the air supply duct 11, or may be installed on the outer wall of the air supply duct 11. When the motor is installed on the outer wall of the air supply pipeline 11, heat generated during the operation of the motor can be directly discharged into the air, and the cooling of the inlet air is facilitated. The output shaft of the motor is fixedly connected with the axial flow fan. When the axial flow fan is completely positioned on the side of the air supply duct 11 that is open downward, the air direction of the axial flow fan is vertically upward. When the axial flow fan is located at the connection of both sides of the blast duct 11, the wind direction of the axial flow fan is just directed into the inverter chamber 10. By adopting the frequency conversion type axial flow fan, the output power of the fan can be automatically adjusted, the air inlet speed is adjusted, the electric energy consumption is reduced, meanwhile, the airflow with stable wind direction is output, and the air can enter the frequency converter chamber 10 according to the stable flow speed. Of course, in other embodiments, the first fan 12 may also be a centrifugal fan, a mixed flow fan, or a cross flow fan, as long as wind power adjustment and directional air delivery can be achieved.
The air outlet 13 is a louver air port, and the air outlet 13 is installed at the joint of the air supply pipeline 11 and the inner wall of the frequency converter chamber 10 and used for adjusting the air inlet direction and the air inlet speed. The air outlet 13 is preferably an electrically controlled air outlet, and the air inlet direction thereof can be adjusted by a controller, and the on-off state of the air supply pipeline 11 can be controlled. Of course, the air outlet can also be a shutter air outlet which is manually adjusted, and the worker can manually adjust the air inlet direction. The tripe wind gap can be single-deck tripe wind gap or double-deck tripe wind gap, and when adopting double-deck tripe wind gap, the scope of wind direction regulation is wider, can adjust the wind direction to the higher region of orientation temperature, if converter 20 produces the heat when long-time operation, the regional temperature in place is obviously higher than other regional temperatures to more be favorable to converter 20's heat dissipation. In other embodiments, the air outlet 13 may be replaced by a valve, etc., as long as the on-off state of the air supply duct 11 can be controlled.
The cooling and dust removing mechanism 7 is installed in the air supply mechanism 1 and used for cooling and removing dust of air passing through the air supply mechanism 1. The temperature-reducing and dust-removing mechanism 7 comprises filter cotton 71 and a cooling pipe 72. The filter cotton 71 is installed in one end of the air supply duct 11 far from the frequency converter chamber 10 and is used for filtering dust in air. The filter cotton 71 can be any one or combination of synthetic fiber filter cotton, non-woven fabric filter cotton, glass fiber filter cotton and active carbon filter cotton. When the first fan 12 is started, external air passes through the filter cotton 71 and enters the air supply pipeline 11, and dust or other granular impurities in the air are attached to the filter cotton 71, so that the air is dedusted. Of course, in other embodiments, the filter cotton 71 may be replaced by a filter net or other filters, as long as the filter net can filter dust in the air.
The cooling pipe 72 is installed in the air supply duct 11, and the cooling pipe 72 is located between the filter cotton 71 and the first fan 12 and used for absorbing heat in the air. The cooling pipe 72 is filled with a cooling liquid. When the air after being dedusted by the filter cotton passes through the air supply pipeline, the heat in the air is absorbed by the cooling liquid in the cooling pipe, so that the aim of cooling the air is fulfilled. In other embodiments, other cooling devices, such as a compressor, may be used to cool. The difference is that the cost of cooling the air is lower when the cooling pipe 72 is used.
The air discharge mechanism 2 is communicated with the inverter room 10, and is used for conveying the air in the inverter room 10 to the outside of the inverter room 10. The exhaust mechanism 2 comprises an exhaust duct 21, a second fan 22, a fan cover 23 and an electronic valve 24. The wind shield 23 is mounted on the inner wall of the frequency converter chamber 10. The wind shield 23 may be detachably connected to the inner wall of the frequency converter chamber 10 by means of a mounting bracket. One end of the exhaust duct 21 is communicated with the fan cover 23, and the other end of the exhaust duct 21 passes through the inverter chamber 10. The exhaust duct 21 and the fan cover 23 together form an exhaust duct, which can communicate air inside and outside the frequency converter chamber 10. The second fan 22 is installed in the exhaust duct 21 and is used for conveying the air in the frequency converter chamber 10 to the outside of the frequency converter chamber 10. Compared with the method of directly adopting pipeline ventilation or adopting other exhaust devices, the air inlet of the fan cover 23 is larger, and the efficiency of air exhaust is higher. The electronic valve 24 is installed on the exhaust duct 21 and used for controlling the on-off state of the exhaust duct 21. In actual installation, the electronic valve 24 may be installed in an end of the exhaust duct 21 away from the hood 23 to prevent dust in the air from flowing back into the inverter chamber 10. In other embodiments, the electronic valve 24 may be replaced with a one-way valve to allow air to flow only from inside the inverter compartment 10 to outside the inverter compartment 10.
As can be seen from fig. 2, a plurality of frequency converters 20 are mounted in the frequency converter room 10. Correspondingly, a plurality of air supply mechanisms 1 and a plurality of air exhaust mechanisms 2 are also arranged on the wall body of the frequency converter room 10. The air supply mechanism 1 and the air exhaust mechanism 2 are respectively arranged on the wall bodies on two opposite sides, so that the fresh air conveyed by the air supply mechanism 1 can be prevented from being directly exhausted through the air exhaust mechanism 2, and the efficiency of fresh air loss is reduced. Meanwhile, the air supply mechanisms 1 and the air exhaust mechanisms 2 operate simultaneously, so that the air exchange rate of the frequency converter chamber 10 is higher, the temperature and air pressure regulation rate is higher, and the requirements of the operating environment of the frequency converter 20 can be met.
The first flowmeter 3, the second flowmeter 4, the temperature sensor 5 and the pressure sensor 6 are used as measuring elements of the dust-free fresh air device and are respectively used for measuring characteristic data in the frequency converter chamber 10.
Specifically, the first flowmeter 3 is installed in the air supply mechanism 1 and used for measuring the intake air flow Q passing through the air supply mechanism 1 in real time I . Specifically, the flowmeter one 3 is installed on the air supply pipeline 11 and is positioned between the fan one 12 and the air outlet 13.
A second flowmeter 4 is arranged in the exhaust mechanism 2 and used for measuring the air outlet flow Q passing through the exhaust mechanism 2 in real time O . Specifically, the second flow meter 4 is installed on the exhaust duct 21 and is located between the second fan 22 and the electronic valve 24. The first flowmeter 3 and the second flowmeter 4 can be differential pressure type flowmeters, electromagnetic flowmeters or ultrasonic flowmeters, and the like, as long as the corresponding air flow can be measured.
A plurality of temperature sensors 5 are respectively arranged in the frequency converter chamber 10, the air supply mechanism 1 and the air exhaust mechanism 2 and used for measuring the average temperature T of the air in the frequency converter chamber 10 A Temperature T of inlet air I And the outlet air temperature T O . Specifically, a temperature sensor 5 may be respectively installed in the air supply duct 11 and the air exhaust duct 21, and the average temperature value in a time period may be used as the corresponding integral temperature T I And the air-out temperature T O . Likewise, a plurality of temperature sensors 5 may be installed in different regions within the inverter compartment 10, so that a temperature average value is calculated from the average temperature of each region as the average temperature T within the inverter compartment 10 A 。
The pressure sensor 6 is mounted in the frequency converter chamber 10 for measuring the average pressure P of the air in the frequency converter chamber 10 A . The pressure sensors 6 can also be arranged in a plurality of areas which are respectively arranged in the frequency converter chamber 10, and the average value of a plurality of pressure values collected in each area is calculated as the average air pressure P A 。
Referring to fig. 3 and fig. 4, fig. 3 is a schematic view of a connection structure of a controller of the dust-free fresh air device in fig. 1; FIG. 4 is a drawing1, a schematic diagram of a module structure of a controller of the dust-free fresh air device. The controller is communicated with each temperature sensor, each pressure sensor, each flowmeter, each fan and the like in a wire connection or wireless connection mode. The controller comprises a storage module, a wind speed identification module, an ideal data generation module, a heat speed identification module and a regulation module. The storage module is used for receiving, transmitting and storing the air inlet flow Q I And the air outlet flow Q O Average temperature T A Temperature T of inlet air I Air outlet temperature T O And average gas pressure P A 。
The wind speed identification module is used for calculating corresponding wind inlet speed and wind outlet speed according to the ratio of the wind inlet flow and the wind outlet flow to the measurement time. According to the air inlet flow quantity delta Q in a time period I The corresponding air intake velocity v can be calculated I Namely: v. of I ＝ΔQ I And/Δ t. Wherein, Δ t is a flow metering period. According to the air outlet flow delta Q in a time period O The corresponding air-out velocity v can be calculated O Namely: v. of O ＝ΔQ O /Δt。
The ideal data generation module is used for generating an ideal temperature T according to a preset temperature range and an air pressure range H And ideal air pressure P H . For example, in the present embodiment, the temperature range is set to 10 to 40 deg.C and the atmospheric pressure range is set to 0.8 to 1.2atm (standard atmospheric pressure), the corresponding ideal temperature may be set to 20 deg.C and the ideal atmospheric pressure may be set to 1.0atm. Of course, in other embodiments, the desired temperature and the desired pressure may be higher or lower, as long as the proper operation of the frequency converter 20 is met and the operator can adapt.
The adjusting module is used for: 1. calculating the ideal temperature T reached by the average temperature and the average air pressure respectively in an adjusting period T H And ideal air pressure P H Velocity v of the incoming air I1 And the air-out velocity v O1 。
According to the air pressure formula and the currently acquired average temperature T A And average gas pressure P A Therefore, the following steps are carried out:
P A V＝n 0 RT A ；
wherein V is the total volume of gas in the frequency converter chamber, n 0 R is the ideal gas constant for the current mass of air in the inverter room.
Then the condition should be met when the average temperature and the average gas pressure in the converter room 10 reach the desired temperature and the desired gas pressure, respectively:
P H V＝n H RT H ；
in the formula, n H Is the mass of air in the inverter room at the desired temperature and the desired air pressure.
Assuming that the average temperature and the average pressure in the frequency converter chamber 10 reach the ideal temperature and the ideal pressure respectively by adjusting the air inlet rate and the air outlet rate in one period t, and the molar volume of the gas is kept to be 22.4L/mol in the process, the following steps are provided:
(v I1 S 1 -v O1 S 2 )/22.4＝n H -n 0
v I1 tT I1 -v O1 tT O1 ＝T H V-T A V
in the formula, S 1 Is the cross-sectional area of the supply air duct, S 2 Is the cross-sectional area, T, of the exhaust duct I1 Is the average intake air temperature, T, over a period of time O1 Is the average outlet air temperature in a time period.
After finishing, the method can obtain:
v I1 ＝[T H V-22.4T O1 (n H -n 0 )]/[s 1 t(T I1 -T O1 )]。
v O1 ＝[T H V-22.4T I1 (n H -n 0 )]/[s 2 t(T I1 -T O1 )]。
since multiple transducers 20 in transducer chamber 10 produce heat during the conditioning process, the actual conditioning time may be longer and the rate of conditioning may need to be changed accordingly. In order to eliminate the influence of the heat output by the frequency converter 20, the heat output rate of the frequency converter 20 can be calculated first, and then the constant temperature operation of the frequency converter chamber 10 is realized by continuously adjusting the air inlet rate and the air outlet rate.
2. According to the heat output rate v of all the frequency converters 20 in the frequency converter room 10 Q Calculating the air intake velocity v when the constant temperature condition is satisfied I And the air outlet velocity v O . I.e. by adjusting the air intake velocity v I And the air outlet velocity v O So that the temperature of the frequency converter chamber 10 is kept constant. The adjusted air intake velocity v I2 And the air outlet velocity v O2 The following conditions are satisfied:
v I2 S 1 T I2 +v Q V＝v O2 S 2 T O2 。
v I2 S 1 P I2 /T I2 ＝v O2 S 2 P O2 /T O2 。
in the formula, T I2 Is the average inlet air temperature under constant temperature condition, T O2 Is the average outlet air temperature under constant temperature condition, P I2 Is the average intake air pressure under constant temperature condition, P O2 Is the average outlet air pressure under the constant temperature condition.
Finishing to obtain:
v I2 ＝v Q VP O2 T I2 /[S 1 (P I2 T O2 2 -P O2 T I2 2 )]
v O2 ＝v Q VP I2 T O2 /[S 2 (P I2 T O2 2 -P O2 T I2 2 )]。
3. and respectively controlling the first fan 12 and the second fan 22 to operate according to the calculated air inlet speed and air outlet speed. The output power of the first fan 12 and the output power of the second fan 22 are adjusted, and the air inlet rate and the air outlet rate are further adjusted, so that the average temperature and the average air pressure in the frequency converter chamber 10 are always in the preset temperature range and the preset air pressure range, and the frequency converter 20 is kept to normally operate.
The heat speed identification module is used for calculating the heat output speed according to the variable quantity of the air inlet speed, the air inlet temperature, the air outlet speed, the air outlet temperature and the average temperature and the variable quantity of the average air pressure. According to the frequency converter chamber10 temperature and pressure variations and corresponding control times t 1 The heat output rate v can be calculated Q Namely:
v Q ＝[V(T H -T A )+v O1 t 1 T O1 -v I1 t 1 T I1 ]/Vt 1 。
in actual operation, the gas molar volume actually changes due to the changes of the temperature and pressure of the inlet air or the outlet air, and in order to reduce the measurement error and improve the adjustment accuracy, a second pressure sensor can be respectively arranged in the air supply pipeline 11 and the air exhaust pipeline 21 to measure the inlet air pressure P I1 And the air pressure P of the outlet air O1 . Then, in an adjusting period t, according to the air pressure calculation formula, it can be known that:
P I1 ΔQ I1 ＝n I1 RT I1 ，
P O1 ΔQ O1 ＝n O1 RT O1 ，
wherein, is Δ Q I1 For the inlet air flow in one regulation period, Δ Q O1 For the outlet air flow in one regulation period, n I1 Quantity of material, n, of inlet air in a conditioning cycle O1 Is the mass of the outlet air during one conditioning cycle.
The mass of the actual intake air is expressed as:
n I1 ＝P I1 ΔQ I1 /RT I1 。
the mass expression of the air of actual air-out is as follows:
n O1 ＝P O1 ΔQ O1 /RT O1 。
at the desired temperature and the desired pressure, the mass of the air in the converter chamber 10 is:
n H ＝n 0 +n I1 -n O1 。
after finishing, the method can be obtained:
P H V/T H ＝P A V/T A +P I v I1 S 1 t-P O v O1 S 2 t。
when the rate of heat output from the inverter 20 is v Q In order to make the average temperature reach the ideal temperature during one regulation period t, there are:
VT A +ΔQ I1 T I1 -ΔQ O1 T O1 +v Q Vt＝VT H 。
the air intake rate and the air outlet rate can be expressed as:
in a time period t, the operation is performed according to the air inlet rate and the air outlet rate, so that the average air pressure and the average temperature in the frequency converter chamber 10 respectively reach the ideal air pressure and the ideal temperature. Then the air inlet speed and the air outlet speed are respectively adjusted to be v I2 And v O2 So that the air temperature and air pressure in the inverter chamber 10 are kept constant. Of course, since the adjustment process has errors and the amount of heat generated by the inverter 20 is not constant, the average air pressure and the average air temperature in the inverter chamber 10 still slowly change until they approach or exceed the preset upper limit or lower limit (e.g. the upper temperature limit of 30 ℃, the lower temperature limit of 20 ℃, the upper air pressure limit of 1.1atm, the lower air pressure limit of 0.9atm, etc.), and the above adjustment process is continuously repeated to keep the air pressure and the temperature in the inverter chamber 10 within the preset range. Different from the existing adjusting mode, even if the dust-free fresh air device of the embodiment can not ensure that the air pressure and the temperature in the frequency converter chamber 10 are constant after the ideal temperature and the ideal air pressure are reached in the frequency converter chamber 10, the adjusting period is far longer than that of the existing adjusting mode, and the required energy consumption is obviously reduced. In addition, according to the rule or the highest limit of the heat dissipation of the frequency converter 20, the corresponding detecting element can be closed after the ideal temperature and the ideal air pressure are reached in the frequency converter chamber 10And the energy consumption is further reduced until a preset time threshold is reached.
The dustless new trend device of this embodiment is through carrying out real-time measurement to atmospheric pressure and temperature in the converter room 10, and then according to the temperature of air inlet and air-out, calculates the air inlet and the air-out speed of adaptation to atmospheric pressure and temperature in the messenger converter room 10 remain throughout in the within range of predetermineeing, and then make converter 20 work under suitable temperature and low dust environment, prolong converter 20's life. In the air inlet process, the output power of the first fan 12 is firstly set, and the air outlet direction and the air outlet area of the air outlet 13 are adjusted in a matching mode, so that air is fed into the frequency converter chamber 10 at the air inlet speed output by the controller. When air enters, dust in the air is filtered by the filter cotton 71, and then heat in the air is absorbed by the cooling pipe 72, so that the air is dedusted and cooled, and the adjusting rate is increased. Similarly, in the air outlet process, the output power of the second fan 2 and the opening area of the electronic valve 24 can be adjusted, so that the air is exhausted out of the frequency converter chamber 10 at the air outlet rate output by the controller.
Please refer to fig. 5, which is a step diagram of a control method applied to the dust-free fresh air device of fig. 1. The embodiment also provides a control method of the dust-free fresh air device for the frequency converter chamber, which is applied to the dust-free fresh air device for the frequency converter chamber. The control method comprises the following processes:
s1: characteristic data of the transducer chamber are collected. The characteristic data includes the flow rate Q of the intake air I And the air outlet flow Q O Temperature T of inlet air I Air outlet temperature T O Average temperature T A And average gas pressure P A . Wherein, air inlet temperature, air-out temperature, average temperature can acquire through corresponding temperature sensor or other temperature-sensing element respectively, and average atmospheric pressure can acquire through pressure sensor etc..
The air inlet speed v can be calculated according to the air inlet flow, the air outlet flow and the corresponding acquisition duration I And the air-out velocity v O . The velocity v of the intake air I And the air-out velocity v O Expressed as:
v I ＝ΔQ I /Δt。
v O ＝ΔQ O /Δt。
where Δ t is the flow metering period, Δ Q I For the inlet flow in one flow metering cycle, Δ Q O The outlet air flow in one flow metering period is adopted.
S2: setting the ideal temperature T H And ideal air pressure P H Adjusting the air inlet rate and the air outlet rate based on the characteristic data to make the average temperature and the average air pressure reach the ideal temperature T respectively H And ideal air pressure P H . Wherein the adjusted air intake speed v I1 And the air-out velocity v O1 Are expressed as:
v I1 ＝[T H V-22.4T O1 (n H -n 0 )]/[S 1 t(T I1 -T O1 )]
v O1 ＝[T H V-22.4T I1 (n H -n 0 )]/[S 2 t(T I1 -T O1 )]
wherein V is the total volume of air in the frequency converter room, n H To reach the ideal temperature T H And ideal gas pressure P H Mass of air in a time-frequency converter room, n 0 Is the amount of material of the air in the current inverter room, and n H -n 0 ＝RT H /P H V-RT A /P A V，T I1 Is the average inlet air temperature, T, over a period of time O1 Is the average outlet air temperature, S, over a period of time 1 Is the cross-sectional area of the inlet air, S 2 Is the cross-sectional area of the outlet air.
In the present embodiment, the temperature range is set to 10-40 deg.c and the atmospheric pressure range is set to 0.8-1.2atm (standard atmospheric pressure), and the corresponding desired temperature may be set to 20 deg.c and the desired atmospheric pressure may be set to 1.0atm. Of course, in other embodiments, the desired temperature and the desired pressure may be higher or lower, as long as the normal operation of the frequency converter is satisfied and the personnel can adapt.
According to the interference of the temperature and the air pressure during air inlet and air outlet on the molar mass of the gas, the corresponding air inlet speed and the air outlet speed are respectively adjusted as follows:
in the formula, P I1 Is the average intake air pressure, P, over a period of time O1 Is the average outlet air pressure over a period of time.
S3: calculating the heat output speed v when all the frequency converters in the frequency converter room run Q . Continuously regulating the air intake speed v I And the air-out velocity v O So that the average temperature T A And average gas pressure P A And is kept constant. Wherein the heat output rate v Q Expressed as:
v Q ＝[V(T H -T A )+v O1 t 1 T O1 -v I1 t 1 T I1 ]/Vt 1 。
in the formula, t 1 To adjust the time duration.
Adjusted air intake velocity v I2 And the air-out velocity v O2 Are expressed as:
v I2 ＝v Q VP O2 T I2 /[S 1 (P I2 T O2 2 -P O2 T I2 2 )]，
v O2 ＝v Q VP I2 T O2 /[S 2 (P I2 T O2 2 -P O2 T I2 2 )]。
in the formula, T I2 Is the average inlet air temperature T under the constant temperature and pressure state O2 Is the average outlet air temperature P under the constant temperature and pressure state I2 Is the average intake air pressure P under the constant temperature and pressure state O2 The average outlet air pressure is under the constant temperature and pressure state.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a dustless new trend device that converter room was used which characterized in that, it includes:
the air supply mechanism is communicated with the frequency converter chamber and is used for conveying air outside the frequency converter chamber into the frequency converter chamber;
a first flowmeter installed in the air supply mechanism and used for measuring the intake flow Q passing through the air supply mechanism in real time I ；
The cooling and dedusting mechanisms are in one-to-one correspondence with the air supply mechanisms, and are arranged in the air supply mechanisms and used for cooling and dedusting air passing through the air supply mechanisms;
at least one air exhaust mechanism which is communicated with the frequency converter chamber and is used for conveying the air in the frequency converter chamber to the outside of the frequency converter chamber;
a second flowmeter installed in the exhaust mechanism for measuring the flow rate Q of the outlet air passing through the exhaust mechanism in real time O ；
A plurality of temperature sensors respectively arranged in the frequency converter chamber, the air supply mechanism and the air exhaust mechanism and used for measuring the average temperature T of the air in the frequency converter chamber A And the temperature T of the inlet air I And the outlet air temperature T O ；
At least one pressure sensor mounted in the inverter chamber for measuring the average pressure P of the air in the inverter chamber A (ii) a And
the controller comprises a storage module, a wind speed identification module, an ideal data generation module, a heat speed identification module and an adjustment module; the storage module is used for receiving, transmitting and storing the air inlet flow Q I And the air outlet flow Q O The average temperature T A The temperature of the inlet air T I The air-out temperature T O And said average gas pressure P A ；
The wind speed identification module is used for calculating corresponding air inlet speed and air outlet speed according to the ratio of the air inlet flow and the air outlet flow to the measurement time;
the ideal data generation module is used for generating an ideal temperature T according to a preset temperature range and an air pressure range H And ideal air pressure P H ；
The adjustment module is used for: 1. calculating the average temperature and the average air pressure of the frequency converter chamber to reach the ideal temperature T in a regulation period T H And said ideal gas pressure P H Velocity v of the incoming air I1 And the air-out velocity v O1 (ii) a Wherein the air intake velocity v I1 And the air-out velocity v O1 Calculated by the following formula:
v I1 ＝[T H V-22.4T O1 (n H -n 0 )]/[S 1 t(T I1 -T O1 )]；
v O1 ＝[T H V-22.4T I1 (n H -n 0 )]/[S 2 t(T I1 -T O1 )]；
wherein V is the total volume of air in the frequency converter room, n H To achieve the desired temperature T H And ideal gas pressure P H Mass of air in a time-frequency converter room, n 0 Is the amount of material of the air in the current inverter room, and n H -n 0 ＝RT H /P H V-RT A /P A V，T I1 Is the average intake air temperature, T, over a period of time O1 Is the average outlet air temperature in a time period, S 1 Is the cross-sectional area of the intake air, S 2 Is the air outlet cross section area;
2. according to the heat output speed v of all frequency converters in the frequency converter room Q Calculating the air intake speed v when the constant temperature condition is met I2 And the air-out velocity v O2 (ii) a Wherein the adjusted air intake speed v I2 And the air-out velocity v O2 Expressed as:
v I2 ＝v Q VP O2 T I2 /[S 1 (P I2 T O2 2 -P O2 T I2 2 )]；
v O2 ＝v Q VP I2 T O2 /[S 2 (P I2 T O2 2 -P O2 T I2 2 )]；
in the formula, T I2 Is the average inlet air temperature, T, at constant temperature O2 Is the average outlet air temperature under constant temperature condition, P I2 Is the average intake air pressure under constant temperature condition, P O2 The average air outlet pressure under the constant temperature condition is adopted;
3. respectively controlling the first fan and the second fan to operate according to the corresponding air inlet speed and air outlet speed;
the heat rate identification module is used for calculating the heat output rate according to the air inlet rate, the air inlet temperature, the air outlet rate, the air outlet temperature, the variation of the average temperature and the variation of the average air pressure; wherein the heat output rate v Q Expressed as:
v Q ＝[V(T H -T A )+v O1 t 1 T O1 -v I1 t 1 T I1 ]/Vt 1 ；
in the formula, t 1 To adjust the time duration.
2. The dust-free fresh air device for the frequency converter chamber is characterized in that the air supply mechanism comprises an air supply pipeline and a first fan, wherein the air supply pipeline penetrates through the inner wall of the frequency converter chamber and is used for communicating air on two sides inside and outside the frequency converter chamber; the first fan is installed in the air supply pipeline.
3. A dust-free fresh air device for a frequency converter room as claimed in claim 2, wherein the air supply mechanism further comprises an air outlet, the air outlet is a louver opening, and the air outlet is installed at a joint of the air supply duct and the inner wall of the frequency converter room and used for adjusting an air supply direction and an air supply speed.
4. A dust-free fresh air device for a frequency converter room as claimed in claim 1, wherein the temperature-reducing and dust-removing mechanism comprises filter cotton and a cooling pipe, the filter cotton is installed in one end of the air supply pipeline, which is far away from the frequency converter room, and is used for filtering dust in air; the cooling pipe is arranged in the air supply pipeline, is positioned between the filter cotton and the first fan and is used for absorbing heat in air; and cooling liquid is filled in the cooling pipe.
5. A dust-free fresh air device for a frequency converter room as claimed in claim 4, wherein the filter cotton is one or more of synthetic fiber filter cotton, non-woven fabric filter cotton, glass fiber filter cotton and activated carbon filter cotton.
6. A dust-free fresh air device for a frequency converter room as claimed in claim 1, wherein the air exhaust mechanism comprises an exhaust duct, a second fan and a fan cover; the fan cover is arranged on the inner wall of the frequency converter chamber; one end of the exhaust pipeline is communicated with the fan cover, and the other end of the exhaust pipeline penetrates through the frequency converter chamber; and the second fan is arranged in the exhaust pipeline.
7. A dust-free fresh air device for a frequency converter room as claimed in claim 6, wherein the air exhaust mechanism further comprises an electronic valve; the electronic valve is arranged on the exhaust pipeline and used for controlling the on-off state of the exhaust pipeline.
8. A control method of a dust-free fresh air device for a frequency converter room, which is applied to the dust-free fresh air device for the frequency converter room as claimed in any one of claims 1 to 7, characterized in that the control method comprises the following processes:
s1: collecting characteristic data of a frequency converter chamber;
s2: setting the ideal temperature T H And ideal air pressure P H (ii) a Adjusting the air inlet rate and the air outlet rate based on the characteristic data so that the average temperature and the average air pressure respectively reach the ideal temperature T H And said ideal gas pressure P H (ii) a Wherein the adjusted air intake speed v I1 And the air-out velocity v O1 Are expressed as:
v I1 ＝[T H V-22.4T O1 (n H -n 0 )]/[S 1 t(T I1 -T O1 )]；
v O1 ＝[T H V-22.4T I1 (n H -n 0 )]/[S 2 t(T I1 -T O1 )]；
wherein V is the total volume of air in the frequency converter room, n H To achieve the desired temperature T H And ideal air pressure P H Mass of air in a time-frequency converter room, n 0 Is the amount of material of the air in the current inverter room, and n H -n 0 ＝RT H /P H V-RT A /P A V，T I1 Is the average intake air temperature, T, over a period of time O1 Is the average outlet air temperature in a time period, S 1 Is the cross-sectional area of the inlet air, S 2 Is the air outlet cross section area;
s3: calculating the heat output speed v when all the frequency converters in the frequency converter chamber run Q (ii) a Continuously adjusting the air inlet speed and the air outlet speed so as to keep the average temperature and the average air pressure constant; wherein the heat output ratev Q Expressed as:
v Q ＝[V(T H -T A )+v O1 t 1 T O1 -v I1 t 1 T I1 ]/Vt 1 ；
in the formula, t 1 To adjust the duration;
adjusted air intake velocity v I2 And the air-out velocity v O2 Are expressed as:
v I2 ＝v Q VP O2 T I2 /[S 1 (P I2 T O2 2 -P O2 T I2 2 )]；
v O2 ＝v Q VP I2 T O2 /[S 2 (P I2 T O2 2 -P O2 T I2 2 )]；
in the formula, T I2 Is the average inlet air temperature T under the constant temperature and pressure state O2 Is the average outlet air temperature P under the constant temperature and pressure state I2 Is the average air pressure of inlet air under the constant temperature and pressure state, P O2 Is the average outlet air pressure under the constant temperature and pressure state.
9. The method as claimed in claim 8, wherein the characteristic data includes an inlet air flow Q in step S1 I And the air outlet flow Q O Temperature T of inlet air I And outlet air temperature T O Average temperature T A And average gas pressure P A (ii) a Wherein, the air inlet speed v is calculated according to the air inlet flow, the air outlet flow and the corresponding acquisition duration I And the air-out velocity v O (ii) a The air intake velocity v I And the air-out velocity v O Are expressed as:
v I ＝ΔQ I /Δt；
v O ＝ΔQ O /Δt；
where Δ t is the flow metering period, Δ Q I For the inlet flow in one flow metering cycle, Δ Q O For discharging in one flow metering periodThe air flow rate.
10. The method as claimed in claim 8, wherein in step S2, the air inlet rate and the air outlet rate are adjusted to be the following according to the temperature and pressure of the air during air inlet and outlet:
in the formula, P I1 Is the average intake air pressure, P, over a period of time O1 Is the average outlet air pressure over a period of time.
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| CN117846942A (en) * | 2024-03-08 | 2024-04-09 | 湖南捷工医疗科技有限公司 | Multifunctional automatic gas detection equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117846942A (en) * | 2024-03-08 | 2024-04-09 | 湖南捷工医疗科技有限公司 | Multifunctional automatic gas detection equipment |
| CN117846942B (en) * | 2024-03-08 | 2024-05-10 | 湖南捷工医疗科技有限公司 | Multifunctional automatic gas detection equipment |
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