CN115370545A - Ventilation, dehumidification and heat dissipation all-in-one machine for wind power generation equipment and air volume adjusting method - Google Patents
Ventilation, dehumidification and heat dissipation all-in-one machine for wind power generation equipment and air volume adjusting method Download PDFInfo
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- 238000007791 dehumidification Methods 0.000 title claims abstract description 64
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000010248 power generation Methods 0.000 title claims abstract description 18
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/60—Cooling or heating of wind motors
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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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- 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
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention discloses a ventilation, dehumidification and heat dissipation all-in-one machine for wind power generation equipment and an air volume adjusting method thereof. The ventilation, dehumidification and heat dissipation all-in-one machine can achieve the purposes of saving energy and improving heat exchange efficiency by adjusting the size of the internal circulation air volume to enable the internal circulation air volume to be smaller than the external circulation air volume. The invention utilizes three working states of equal air volume, unequal air volume and intermittent state, and can give consideration to higher heat exchange quantity, heat exchange efficiency and energy-saving requirements.
Description
Technical Field
The invention relates to a ventilation, dehumidification and heat dissipation all-in-one machine for wind power generation equipment, and also relates to a corresponding air volume adjusting method, belonging to the technical field of air conditioning.
Background
At present, the wind power generation technology is rapidly and continuously developing, and the development trend is represented by large single machine capacity, change of fan blades, tower height rise, progress of control technology and development of offshore wind power generation. The gradual increase of the capacity of the single machine will cause the temperature of the engine room to rise, and the temperature of parts such as a stator coil and magnetic steel of the wind driven generator is overhigh, so that faults are caused. How to effectively solve the temperature rise bottleneck of the wind driven generator, the heat dissipation capacity of each part in the cabin of the wind driven generator is greatly increased, and meanwhile, the energy consumption can be reduced, which becomes one of the key contents for further development of the wind power generation technology.
Large wind generators are typically mounted on towers of up to tens or even hundreds of meters, facing wind conditions very similar to super high-rise buildings. For a super high-rise building, the windward side of the building facade can bear large positive wind pressure, and the local surfaces of the leeward side and the crosswind side can bear large negative wind pressure. As the height of the building increases, the value of the wind pressure rapidly increases. If the air outlet is positioned in the positive pressure area of the windward side and the fresh air intake is positioned in the negative pressure area of the leeward side, the problems of unsmooth air exhaust and fresh air intake can be directly caused, indoor waste gas cannot be timely discharged, and fresh air cannot be timely introduced. However, because the wind direction can change frequently (such as seasonal changes), and the positions of the windward side and the leeward side of the outer facade of the building are in constant change, the existing design can not make the fresh air intake in various wind directions always in the positive pressure area and the air exhaust always in the negative pressure area, and can only be effective in partial time, so that the continuous and stable operation of the fresh air and the air exhaust system can not be ensured.
In the Chinese invention patent with the patent number ZL201310325833.0, an air inlet and exhaust device of a fresh air unit of a super high-rise building is disclosed. This advance exhaust device installs two air intakes and two air outlets respectively on super high-rise building's the outer wall of difference side, be equipped with pressure sensor on the outer wall of air intake and air outlet department, every air intake and air outlet all are furnished with electronic blast gate, pressure sensor and electronic blast gate all are connected with the treater, the treater is according to opening and closing of every electronic blast gate of pressure sensor measuring wind pressure numerical control, with the new trend of guaranteeing super high-rise building and exhaust system's operational effect, avoid airing exhaust and the new trend air inlet not smooth.
In addition, in the Chinese patent application with the application number of 201910790558.7, a ventilation and dehumidification integrated machine for a wind driven generator is also disclosed. A ventilation and dehumidification integrated machine is arranged inside the cabin of the wind driven generator at a position close to the ground, and a ventilation device of the ventilation and dehumidification integrated machine is positioned in the first cavity and used for guiding outdoor humid air into the first cavity; the dehumidifying device is located in the second chamber and used for drying air. However, in this solution, both the ventilation device and the dehumidification device are located in separate chambers and the wind pressure difference is not large at the ground. Therefore, the energy consumption is large, and the heat dissipation effect on the heating components in the engine room is not obvious.
Disclosure of Invention
The invention aims to provide a ventilation, dehumidification and heat dissipation all-in-one machine for wind power generation equipment.
The invention aims to solve another technical problem of providing an air volume adjusting method of the ventilation, dehumidification and heat dissipation all-in-one machine.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to a first aspect of the embodiment of the invention, a ventilation, dehumidification and heat dissipation all-in-one machine for wind power generation equipment is provided, and comprises a processor, a memory, an internal circulation air inlet temperature sensor, an internal circulation air outlet temperature sensor, an external circulation fan speed regulation switch and an internal circulation fan speed regulation switch; wherein,
the processor is connected with the temperature sensor of the inner circulation air inlet;
the processor is connected with the speed regulating switch of the external circulation fan and used for sending a switch control signal to the speed regulating switch;
the processor is also connected with the speed regulating switch of the internal circulation fan and is used for sending switch control and speed regulating signals to the speed regulating switch;
the external circulation fan speed regulating switch is used for controlling the external circulation axial flow fan to be turned on or turned off;
the inner circulation fan speed regulating switch is used for controlling the opening or closing of the inner circulation axial flow fan and regulating the rotating speed.
Preferably, the ventilation, dehumidification and heat dissipation all-in-one machine further comprises a shell; the shell comprises an internal circulation air inlet, an internal circulation air outlet, an external circulation air inlet and an external circulation air outlet; wherein,
the internal circulation air inlet is positioned on the bottom surface of the shell; the internal circulation air outlet is cylindrical and is positioned at the top of the shell;
the external circulation air inlet is positioned on one side wall of the shell and is connected with an opening of the tower barrel; the external circulation air outlet is positioned on the other side wall of the shell, is opposite to the external circulation air inlet and is connected with the other opening of the tower barrel.
Preferably, the ventilation, dehumidification and heat dissipation all-in-one machine further comprises an internal circulation axial flow fan and an external circulation axial flow fan;
the internal circulation axial flow fan is positioned in the internal circulation air outlet, and the air outlet faces to the cabin space;
the external circulation axial flow fan is positioned in the external circulation air outlet.
Preferably, the ventilation, dehumidification and heat dissipation all-in-one machine further comprises a heat exchanger core;
the heat exchanger core is positioned in the shell and comprises a plurality of machine cores, end plates, wrap angles and epoxy aluminum foils; the end plates are arranged on the front surface and the back surface of each movement, and the wrap angles are arranged on the four edges of each movement and used for fixing the internal epoxy aluminum foil.
According to a second aspect of the embodiment of the present invention, there is provided an air volume adjusting method for the ventilation, dehumidification and heat dissipation all-in-one machine, at least including the following steps:
s1: obtaining the temperature of an air inlet of the internal circulation, judging whether the temperature reaches a low temperature value or a high temperature value, and entering a step S2 if the temperature is between the low temperature value and the high temperature value;
s2: calculating to obtain external circulation air volume Ym according to the rotating speed detected by the external circulation fan sensor, and entering the step S3;
s3: according to the external circulation air volume Ym, searching the internal circulation air volume Xn corresponding to the maximum heat exchange efficiency under the external circulation air volume Ym from a state data table stored in a memory;
s4: and the processor sends a signal for adjusting the rotating speed of the internal circulation axial flow fan to the speed adjusting switch of the internal circulation fan so as to adjust the internal circulation air quantity to the internal circulation air quantity Xn, and then the step S1 is returned.
Preferably, after the step S4, the method further includes:
s5: after the preset time, the processor reads the actual temperature value t of the internal circulation air outlet detected by the internal circulation air outlet temperature sensor and the pre-obtained temperature value t of the internal circulation air outlet h2 By comparison, if t> t h2 Increasing the equal step length of the internal circulation air volume until t = t h2 + Delta; if t ≦ t h2 Stopping adjusting the internal circulation air quantity; wherein, delta is a preset temperature range, t h2 In a state data table, the air dry bulb temperature at the internal circulation outlet corresponding to the maximum heat exchange efficiency in the state data table.
Preferably, after the step S5, the method further includes:
s6: and when the temperature of the internal circulation air inlet is higher than the high temperature value, the processor sends a signal for adjusting the rotating speed of the internal circulation axial flow fan to the speed-adjusting switch of the internal circulation fan so as to adjust the internal circulation air quantity to the external circulation air quantity Ym, and then the step S1 is returned.
Preferably, after the step S6, the method further includes:
s7: and when the temperature of the internal circulation air inlet is higher than the high temperature value, the processor sends out a speed regulation switch for regulating the rotating speed of the internal circulation axial flow fan to a preset low speed or stop, and then the step S1 is returned.
Preferably, the state data table is obtained by measuring each internal circulation air volume Xn and an external circulation air volume Ym value corresponding to each internal circulation air volume Xn according to a preset air volume interval, calculating to obtain a corresponding heat exchange efficiency Enm, and then correspondingly storing each internal circulation air volume Xn, the external circulation air volume Ym value and the heat exchange efficiency Enm.
Preferably, the state data table is further based on the internal circulation air outlet temperature t corresponding to each internal circulation air quantity Xn h2 Calculating to obtain corresponding heat exchange efficiency Enm, and then calculating the internal circulation air volume Xn, the external circulation air volume Ym and the internal circulation air outlet temperature t h2 And correspondingly storing the heat exchange efficiency Enm.
Compared with the prior art, the invention has the following technical characteristics: (1) The ventilation, dehumidification and heat dissipation integrated machine can achieve the purposes of saving energy and improving heat exchange efficiency by adjusting the size of the internal circulation air volume to enable the internal circulation air volume to be smaller than the external circulation air volume; (2) By switching 3 working states of equal air volume, unequal air volume and intermittent state, higher heat exchange quantity, heat exchange efficiency and energy-saving requirements can be considered; (3) three functions of ventilation, dehumidification and heat dissipation can be considered; (4) The wind power generation device is suitable for wind power generation, particularly severe working environments such as offshore wind power generation and the like.
Drawings
FIG. 1A is a schematic view illustrating an installation of a ventilation, dehumidification and heat dissipation all-in-one machine in a nacelle of a wind turbine provided by an embodiment of the invention;
fig. 1B is a schematic view illustrating an installation of the ventilation, dehumidification and heat dissipation all-in-one machine provided in the embodiment of the present invention in a tower top;
FIG. 2 is a schematic mechanical structure diagram of a ventilation, dehumidification and heat dissipation all-in-one machine provided by an embodiment of the invention;
fig. 3 is a schematic structural diagram of a core of a heat exchanger in the integrated ventilation, dehumidification and heat dissipation machine according to the embodiment of the present invention;
fig. 4 is a schematic control structure diagram of a ventilation, dehumidification and heat dissipation all-in-one machine provided in the embodiment of the present invention;
FIG. 5 is a flowchart illustrating the operation of the ventilation, dehumidification and heat dissipation all-in-one machine according to the embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating heat exchange among various sets of cores inside the integrated ventilation, dehumidification and heat dissipation machine according to the embodiment of the present invention;
fig. 7 is a schematic temperature diagram illustrating heat exchange of the core in the group a in the ventilation, dehumidification and heat dissipation all-in-one machine according to the embodiment of the present invention;
fig. 8 is a schematic temperature diagram of heat exchange performed by the core in the group B in the ventilation, dehumidification and heat dissipation all-in-one machine according to the embodiment of the present invention.
Detailed Description
The technical contents of the invention are specifically described in the following with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1A, an embodiment of the present invention discloses a ventilation, dehumidification and heat dissipation integrated machine 100 for a wind power generation device, which is installed in a nacelle of an offshore or inland wind turbine. Specifically, the integrated ventilation, dehumidification and heat dissipation machine 100 is disposed in the tower top 200 of the wind turbine and is disposed in close proximity to the generator set 300. The ventilation, dehumidification and heat dissipation all-in-one machine 100 is used for providing ventilation, heat dissipation and dehumidification functions for various devices in the cabin of the wind turbine, particularly for the generator set 300 serving as a maximum heat generation source, so that the temperature in the cabin is less than or equal to a preset temperature, for example, 37 ℃, and each device can normally operate.
As shown in fig. 1B, the ventilation, dehumidification and heat dissipation all-in-one machine 100 is fixed on a tower 102 of a wind turbine generator, the heat exchanger fixing support 103 is in a shape of a long and thin cuboid and is connected with an inner wall of the tower 102 through stainless steel screws, the other ends of the two heat exchanger fixing supports 103 are embedded into a columnar groove at the upper end of the back of the ventilation, dehumidification and heat dissipation all-in-one machine 100, and the ventilation, dehumidification and heat dissipation all-in-one machine 100 is fixed on the heat exchanger fixing support 103 through stainless steel screws.
As shown in fig. 2, the ventilation, dehumidification and heat dissipation all-in-one machine 100 at least comprises a shell 1, an internal circulation axial flow fan 2, an external circulation axial flow fan 3, a heat exchanger core 4, an access door 5 and a bottom frame 6. Preferably, a drip tray 7 and a drain pipe 8 are further provided in the bottom frame 6.
For convenience of description, the side where the access door 5 is located is set as the front of the ventilating, dehumidifying and heat dissipating all-in-one machine 100.
In one embodiment of the invention, the housing 1 comprises an internal circulation intake 11, an internal circulation outtake 12, an external circulation intake 13 and an external circulation outtake 14. An internal circulation air intake 11 is located in the bottom surface of the housing 1 for taking in hot air below the cabin interior. The internal circulation outlet 12 is cylindrical, and in one embodiment of the invention, one or more (two in the figure) outlets are provided at the top of the housing 1 for discharging the cooled air upwards. The characteristics of hot air floating and cold air sinking are utilized to improve the efficiency of air mixing in the cabin.
In one embodiment of the present invention, the external circulation air inlet 13 is located on one side wall (e.g., the right side wall in the figure) of the casing 1, and is connected to an opening on the tower for sucking cold air from outside the tower. The external circulation air outlet 14 is located on the other side wall (for example, the left side wall in the figure) of the casing 1, is opposite to the external circulation air inlet 13, and is connected with another opening on the tower for sending the heated air with the increased temperature out of the tower. The external circulation air inlet 13 and the external circulation air outlet 14 are connected with the tower opening through flange joints in a flexible connection mode. In one embodiment of the invention, the outer diameter of the flange interface is 600mm, the diameter of the bolt hole is 550mm, and the inner diameter is 500mm. In addition, the shell 1 is coated with 150 g of aluminum-zinc coated plate and is subjected to electrostatic powder spraying by a cathode electrophoretic coating technology, and the spraying thickness needs to be more than 95 microns, so that the shell 1 has excellent corrosion resistance to adapt to a humid environment.
In one embodiment of the present invention, the internal circulation axial flow fan 2 is used for circulating hot air inside the tower top, so that a high temperature axial flow fan is adopted, which can resist high temperature, and the two internal circulation axial flow fans 2 are respectively located in the two internal circulation air outlets 12, and the air outlets face to the cabin space (i.e., upward in the figure). The external circulation axial flow fan 3 is used for circulating air outside the tower drum, and the waterproof salt-proof axial flow fan is adopted and is positioned in the external circulation air outlet 14 due to the fact that sea surface air is high in humidity and salt content. Meanwhile, in order to prevent the fan from stopping working in a low-temperature environment, low-temperature grease is used in the fan, so that the equipment survival temperature range of the ventilation, dehumidification and heat dissipation all-in-one machine 100 is large, and the ventilation, dehumidification and heat dissipation all-in-one machine can normally work within the range of minus 40 ℃ to plus 90 ℃. In addition, the motor working voltage of the internal circulation axial flow fan 2 and the external circulation axial flow fan 3 is 380V, and a constant rotating speed control mode is adopted.
In one embodiment of the invention, the heat exchanger core 4 is located inside the shell 1, as shown in fig. 3. The heat exchanger core 4 comprises a plurality of cartridges 40, end plates 41, wrap angles 42 and aluminum epoxy foil 43. End plates 41 are disposed on both sides of each core 40, and corners 42 are disposed on four edges of each core 40 for fixing an inner aluminum epoxy foil 43.
With reference to fig. 3 and 6-8, in one embodiment of the present invention, the heat exchanger core 4 is formed by combining 12 500mm × 500mm × 300mm movements 40, and has two layers, three columns and two rows, i.e., 1500 × 1000 × 600 mm. The heat exchanger core 4 is of a conventional cross flow plate type structure, each core 40 comprises a plurality of layers of heat exchange plates, and two sides of each metal plate for heat exchange are respectively provided with different air channels (an inner circulation air channel and an outer circulation air channel). The inside air of tower section of thick bamboo and tower section of thick bamboo outside air become the vertical direction flow each other respectively in the runner of every metal slab both sides promptly, and the inside air of tower section of thick bamboo is from up vertical flow down, and tower section of thick bamboo outside air is then from right side to left horizontal flow, and the heat of high temperature side (tower section of thick bamboo inside air) can transmit low temperature side (tower section of thick bamboo outside air) through the metal slab, carries out the heat exchange, has heat exchange efficiency height, easy to maintain, characteristics such as longe-lived. The heat exchange method only needs to utilize natural resources, does not use a refrigerant, better accords with the environmental protection principle, and has obvious energy-saving and consumption-reducing effects.
In addition, inside and outside two air cycle passageways are isolated each other, have epoxy aluminium foil 43 to separate each other, and entry edge and export edge leakproofness are strong, can prevent effectively that sand and dust or salinity particle etc. from getting into the cabin inside, guarantee heat exchanger core 4's gas tightness, keep inside clean, the drying of tower section of thick bamboo, prevent effectively that the inside and outside air cross contamination of tower section of thick bamboo. Due to the adoption of the aluminum plate with the epoxy coating, the heat exchanger core body 4 has excellent corrosion resistance so as to adapt to the humid working environment of the wind driven generator.
In one embodiment of the present invention, the access door 5 is located on the front surface of the housing 1, the edges of the housing 1 on both sides of the access door 5 are provided with vertical sliding grooves, and the access door 5 can slide into the lower end from the upper end of the sliding grooves to isolate the inside of the housing 1 from the outside. The distance between the front surface of the shell 1 and the side wall of the tower barrel is wider than the distance between the back surface of the shell 1 and the side wall of the tower barrel, and the heat exchanger core body 4 is convenient to install and maintain.
In one embodiment of the invention, the bottom frame 6 is located at the bottom of the shell 1 and connected with the shell 1 through stainless steel screws, only 6 supports are arranged around the bottom frame 6, air inside the tower can enter the internal circulation air inlet 11 through the periphery of the bottom frame 6, the bottom of the bottom frame 6 is closed and used for supporting the water pan 7 and the drain pipe 8, and the water pan 7 is connected with the drain pipe 8 and used for draining accumulated water generated when cold and hot air is subjected to heat exchange to the outside of the tower so as to avoid humidity.
In summary, in order to adapt to the environment conditions of high humidity and much salt in sea surface air, the shell 1 is subjected to hot galvanizing rust-proof treatment, the heat exchanger core 4 is made of an aluminum plate with an epoxy coating, the impeller and all connecting pieces are made of 316L stainless steel, the screw and the nut are also made of stainless steel, all parts in contact with external circulation need to reach the C5-M corrosion prevention grade, and parts related to internal circulation need to reach the C4 corrosion prevention grade or above, so that the ventilation, dehumidification and heat dissipation all-in-one machine provided by the invention has very strong moisture resistance and corrosion resistance.
In addition, at least two fan sensors and three temperature sensors are also installed in the housing 1. The fan sensor is used for detecting whether the rotating speeds of the inner circulation axial flow fan 2 and the outer circulation axial flow fan 3 are normal or not and whether the fans stop operating or not, and the temperature sensor is used for detecting the temperatures of the inner circulation air inlet 11, the inner circulation air outlet 12 and the outer circulation air inlet 13 and judging whether the temperature of the inner circulation air inlet 11 is within a preset temperature range or not. The data monitored by the sensor in real time can be transmitted to the cloud end through remote data transmission, so that the operation condition of the ventilation, dehumidification and heat dissipation all-in-one machine 100 can be remotely monitored and remotely alarmed. If the fan runs abnormally or the temperature at the inner circulating air inlet 11 is higher than a preset value (50 ℃), self-protection is carried out in an automatic power-off mode, monitoring personnel are informed through remote alarm, and the maintenance by the personnel is convenient.
On the basis of the ventilation, dehumidification and heat dissipation all-in-one machine disclosed by each embodiment, the invention further provides an air volume adjusting method of the ventilation, dehumidification and heat dissipation all-in-one machine. As introduced in the background art, similar to high-rise buildings, the wind pressure at a high place of the wind power generator is very large and can change frequently along with the wind direction; and the pressure in the engine room of the wind driven generator is different from the outdoor pressure, so that the ventilation, dehumidification and heat dissipation integrated machine in the embodiment of the invention works in the environment with unequal air volume. This is a normal working environment different from ventilation systems or ventilation systems of office buildings. Because the ventilation system or the air exchange system works in the equal air volume environment in the conventional working environment, the heat exchanger control method is designed on the premise of equal air volume. Therefore, the ventilation, dehumidification and heat dissipation all-in-one machine in the embodiment of the invention needs a new air volume adjusting method, namely a control method under the condition of unequal air volumes introduced below.
In the process of unequal air volume regulation, heat exchange efficiency and heat exchange quantity are two important reference indexes.
The heat exchange efficiency calculation formula is as follows:
wherein E is the heat exchange efficiency; t is t h1 The temperature of the air dry bulb at the internal circulation inlet is unit ℃; t is t h2 The temperature of the air dry bulb at the internal circulation outlet is unit ℃; t is t c1 Is the temperature of the air dry bulb at the inlet of the external circulation in units of ℃.
The heat exchange quantity calculation formula is as follows:
wherein Q is heat exchange quantity, and the higher the numerical value of Q is, the more the indoor temperature can be effectively reduced, the unit KW is; cp is the specific heat of air, equal to a constant value of 0.24kcal/kg ℃; rho is air density and is equal to constant value of 1.2kg/m for carrying out heavy planting; ly is internal circulation air volume, and the unit m is year/h; t is the temperature T of the air dry bulb at the inlet of the internal circulation h1 (short for short: temperature of air inlet of internal circulation) and temperature t of air dry bulb at outlet of internal circulation h2 (short for short: temperature of air outlet of internal circulation), namely T = T h1 －t h2 In units of; and alpha is an air volume ratio coefficient, and alpha =1.45-0.45k, wherein k is the ratio of the internal circulation air volume to the external circulation air volume, namely Lx is the external circulation air volume. According to the formula 2, the heat exchange amount is determined by the internal circulation air quantity Ly, the external circulation air quantity Lx, the temperature difference T and the heat exchange efficiency E. On the premise that the external circulation air volume Lx is determined (an air gauge can measure), the internal circulation air volume Ly is reduced in a preset range, and the heat exchange efficiency E can be increased. This is because when the heat exchange amount is large, the heat exchange efficiency is not necessarily high; and vice versa.
As shown in fig. 4, the control module in the integrated ventilation, dehumidification and heat dissipation machine 100 includes a processor 400, a memory 410, an internal circulation air inlet temperature sensor 420, an internal circulation air outlet temperature sensor 430, an external circulation fan sensor 440, an external circulation fan speed regulation switch 450, and an internal circulation fan speed regulation switch 460. The processor 400 is connected to the internal circulation intake temperature sensor 420, and is configured to send information of start detection to the internal circulation intake temperature sensor or receive information of detection result from the internal circulation intake temperature sensor 420. In addition, the processor 400 is connected to the outer circulation fan speed adjustment switch 450 for sending a switch control signal thereto; the processor 400 is also connected to an internal circulation fan speed adjustment switch 460 for sending on-off control and speed adjustment signals thereto. The outer circulation fan speed-adjusting switch 450 controls the turning on or off of the outer circulation axial flow fan 3, and the inner circulation fan speed-adjusting switch 460 controls the turning on or off and the rotation speed of the inner circulation axial flow fan 2.
After the ventilation, dehumidification and heat dissipation all-in-one machine 100 starts to work, automatic control is performed according to the flow shown in fig. 5, and the internal and external circulation fans operate in different states by adjusting the air volume of the internal circulation fan, so that the purposes of saving energy and improving heat exchange efficiency are achieved.
In an embodiment of the present invention, the state data table shown in table 1 is obtained by measuring each internal circulation air volume Xn and the external circulation air volume Ym value corresponding to each internal circulation air volume Xn according to a predetermined air volume interval, calculating to obtain the corresponding heat exchange efficiency Enm, and then correspondingly storing each internal circulation air volume Xn, the external circulation air volume Ym value, and the heat exchange efficiency Enm. Specifically, in the early stage, type selection software is used to obtain the maximum value of the heat exchange efficiency Enm when the external circulation air volume Yn is obtained at every predetermined air volume interval (e.g., 4500m for cultivation/h, 5000m for cultivation/h, 5500m for cultivation/h) and the internal circulation air volume corresponding to Yn is Xn. Corresponding state data (external circulation air quantity Yn, internal circulation air quantity Xn and internal circulation air inlet temperature t) in the state are obtained h1 Inner circulation air outlet temperature t h2 Heat exchange efficiency Enm) is stored in the memory 410 for convenient subsequent retrieval.
TABLE 1 State data Table
After the wind driven generator starts to work, the processor 400 reads the detection value t of the inner circulation air inlet temperature sensor 420 in real time h1 . When the temperature detected by the temperature sensor 420 of the air inlet of the internal circulation reaches a low temperature value (for example, 36 ℃), the integrated ventilation, dehumidification and heat dissipation machine is started. The processor 400 sends control signals to the outer circulation blower speed switch 450 and the inner circulation blower speed switch 460 to turn on.
If the temperature t at the internal circulation air inlet 11 is high h1 The temperature is higher than the high temperature value (for example 40 ℃), and the internal and external circulation fans are in the same air volume running state. Under the condition of the air flow operation, the rotating speeds of the internal circulation axial flow fan 2 and the external circulation axial flow fan 3 are equal (under the condition that the specifications of the internal circulation axial flow fan and the external circulation axial flow fan are the same), so that the internal circulation air flow and the external circulation air flow which are independent from each other are equal. This achieves maximum heat exchange efficiency, but also has greater power consumption.
If the temperature t at the internal circulation air inlet 11 is high h1 Between a high temperature value (for example, 40 ℃) and a low temperature value (for example, 36 ℃), the processor 400 needs to send a speed regulation signal to the internal circulation fan speed regulation switch 460, so that the rotating speed of the internal circulation axial flow fan 2 is reduced, the internal circulation air volume is reduced, and the internal circulation axial flow fan enters the operation in a state that the internal circulation and the external circulation have unequal air volumes. Or, if the temperature at the internal circulation air inlet 11 is reduced to a high temperature value or below, the speed of the internal circulation axial flow fan 2 is reduced, and the internal circulation and the external circulation are in an unequal air volume running state. In this state, the internal circulation air volume and the external circulation air volume are not equal, but the lowest power consumption is realized on the premise of the maximum heat exchange rate, so that the energy conservation is realized.
If the temperature t at the air inlet 11 of the internal circulation is high h1 And when the temperature is lower than or equal to the low temperature value, the internal circulation axial flow fan 2 enters an intermittent working state, for example, periodically works at a rated power for a preset time, and then enters a standby state. In this state, the operation is performed with the lowest power consumption or stopped to achieve energy saving.
The following further introduces the specific working process of the air volume adjusting method under the unequal air volume state:
s1: and obtaining the temperature of the air inlet of the internal circulation, judging whether the temperature reaches a low temperature value or a high temperature value, and entering the step S2 if the temperature is between the low temperature value and the high temperature value.
By reading the temperature sensed by the internal circulation intake temperature sensor 420, i.e., the internal circulation intake temperature t h1 The temperature t of the air inlet of the internal circulation can be judged h1 Whether it is between the high temperature value and the low temperature value. If the temperature of the air inlet of the internal circulation is between the high temperature value and the low temperature value, the next step is carried out; otherwise, returning to S1 to continue reading t h1 。
S2: and calculating to obtain the external circulation air volume Ym according to the rotating speed detected by the external circulation fan sensor 440, and entering the step S3.
S3: according to the external circulation air volume Ym, the internal circulation air volume Xn corresponding to the maximum heat exchange efficiency under the external circulation air volume Ym is searched from the state data table stored in the memory 410.
For example, when external circulation air volume Y2 is 5000 m/h, looking up in the status data table shown in table 1, the maximum heat exchange efficiency E in the column is 67.1%, and internal circulation air volume X1 corresponding to the maximum heat exchange efficiency E =67.1% is 4200 m/h. Therefore, the state with the minimum power consumption and the maximum heat exchange efficiency is as follows: and when the external circulation air volume is 5000m for carrying out the high-speed cultivation, the internal circulation air volume is 4200m for carrying out the high-speed cultivation.
S4: the processor 400 sends a signal for adjusting the rotation speed of the inner circulation axial flow fan 2 to the inner circulation fan speed adjustment switch 460 to adjust the inner circulation air volume to the inner circulation air volume Xn, and then returns to step S1.
Since the state data table (table 1) is a simulation result, it is necessary to add an air volume fine adjustment step on the basis of the air volume adjustment method implemented in each of the above steps in consideration of the diversity of the actual operating environment. That is, after step S4, the following steps are added: and carrying out fine adjustment on the internal circulation air quantity.
In one embodiment of the present invention, the air volume adjusting method may include the steps of:
s1: acquiring the temperature of an air inlet of the internal circulation, judging whether the temperature reaches a low temperature value or a high temperature value, and entering a step S2 if the temperature is between the low temperature value and the high temperature value;
s2: calculating to obtain external circulation air volume Ym according to the rotating speed detected by the external circulation fan sensor 440, and entering the step S3;
s3: according to the external circulation air volume Ym, searching the internal circulation air volume Xn corresponding to the maximum heat exchange efficiency under the external circulation air volume Ym from a state data table stored in the memory 410;
s4: the processor 400 sends a signal for adjusting the rotation speed of the inner circulation axial flow fan 2 to the inner circulation fan speed adjustment switch 460 to adjust the inner circulation air volume to the inner circulation air volume Xn, and then returns to step S1;
s5: after the preset time, the processor reads the actual temperature value t of the internal circulation air outlet detected by the internal circulation air outlet temperature sensor and the pre-obtained temperature value t of the internal circulation air outlet h2 By comparison, if t> t h2 Increasing the equal step length of the internal circulation air volume until t = t h2 + Delta; if t ≦ t h2 The regulation of the internal circulation air volume is stopped.
Wherein, delta is a preset temperature range; t is t h2 Is the temperature of the air dry bulb at the internal circulation outlet corresponding to the maximum heat exchange efficiency in the state data table.
Therefore, the air volume adjusting method provided by the embodiment can further reduce the power consumption and has the effect of energy conservation.
As shown in fig. 5, in an embodiment of the present invention, when the temperature of the air inlet of the internal circulation is greater than or equal to the high temperature value (e.g. greater than 40 ℃), the operation is performed in the equal air volume state to ensure the maximum heat exchange amount; the operation is in an intermittent state when the temperature is lower than or equal to a low temperature value (for example, lower than 36 ℃) so as to reduce energy consumption; when the temperature is between the low temperature value or the high temperature value, the operation is in an unequal air volume state so as to ensure the highest heat exchange efficiency. I.e. there are 3 operating states.
In another embodiment of the present invention, the air volume adjusting method may further include the steps of:
s1: obtaining the temperature of an air inlet of the internal circulation, judging whether the temperature reaches a low temperature value or a high temperature value, and entering a step S2 if the temperature is between the low temperature value and the high temperature value; if the temperature is higher than or equal to the high temperature value, the step S6 is executed; if the temperature is less than or equal to the low temperature value, the step S7 is executed;
s2: calculating to obtain external circulation air volume Ym according to the rotating speed detected by the external circulation fan sensor 440, and entering the step S3;
s3: according to the external circulation air volume Ym, searching the internal circulation air volume Xn corresponding to the maximum heat exchange efficiency under the external circulation air volume Ym from a state data table stored in the memory 410;
s4: the processor 400 sends a signal for adjusting the rotation speed of the internal circulation axial flow fan 2 to the internal circulation fan speed adjustment switch 460 to adjust the internal circulation air volume to the internal circulation air volume Xn, and then returns to step S1.
It should be noted that, in the air volume adjusting method provided in the above embodiment, step S5 does not need to be executed, and only step S6 or step S7 needs to be selectively executed according to actual situations. Wherein, step S6 includes the following contents: the processor 400 sends a signal for adjusting the rotation speed of the inner circulation axial flow fan 2 to the inner circulation fan speed adjustment switch 460 to adjust the inner circulation air volume to the outer circulation air volume Ym, and then returns to step S1. Step S7 includes the following: the processor 400 issues an adjustment of the rotational speed of the inner circulation axial flow fan 2 to a predetermined low speed or stop to the inner circulation fan speed adjustment switch 460, and then returns to step S1.
Thus, when the temperature at the internal circulation air inlet 11 is reduced to 36 ℃ or below, the processor 400 sends a closing control signal to the external circulation fan speed regulating switch 450 and the internal circulation fan speed regulating switch 460, and the internal and external circulation fans stop running or run at a low speed, so that the energy consumption can be further reduced when the temperature is low.
The following describes the calculation process of the heat exchange efficiency and the heat exchange amount in the ventilation, dehumidification and heat dissipation all-in-one machine 100 provided by the present invention with reference to fig. 6 to 8, and compares the heat exchange efficiency and the heat exchange amount in the two modes of equal air volume and unequal air volume to describe the technical effects that can be achieved by the present invention.
In an embodiment of the present invention, when the integrated ventilation, dehumidification and heat dissipation machine 100 is operated in an equal air volume state, for example, when the internal circulation air volume and the external circulation air volume are 5500 m/h, assuming that the internal circulation inlet temperature is 45 ℃, the external circulation inlet temperature is 30 ℃, the heat exchange efficiency is 54.1%. The specific calculation procedure is as follows.
As known, 6 groups of machine cores (numbered from A to F) are arranged in the ventilation, dehumidification and heat dissipation all-in-one machine 100, and the air supply and exhaust temperatures from the machine cores of the group A to the machine cores of the group F can be sequentially calculated according to plate type heat exchange model selection software.
First, as shown in fig. 7, the outlet air temperature of the group a movement is calculated: the known internal circulation air inlet temperature of the group A core is 45 ℃, the external circulation air inlet temperature is 30 ℃, and the internal circulation air outlet temperature and the external circulation air outlet temperature of the group A core are 36.88 ℃ and 38.08 ℃ respectively according to calculation of plate type heat exchange model selection software.
Then, as shown in fig. 8, the outlet air temperature of the group B core is calculated: at the moment, the internal circulation inlet air temperature is still 45 ℃, the external circulation inlet air temperature of the group B core is 38.08 ℃ of the external circulation outlet air temperature of the group A core, and the internal circulation outlet air temperature and the external circulation outlet air temperature of the group B core are 41.26 ℃ and 41.82 ℃ respectively according to calculation of plate type heat exchange model selection software.
By analogy, as shown in table 2, the air outlet temperature of the inner circulation of the group A of the engine cores can be calculated to be 36.88 ℃, and the air inlet temperature of the outer circulation of the group A of the engine cores is calculated to be 30 ℃; the internal circulation air outlet temperature of the group C machine core is 43.28 ℃, and the external circulation air outlet temperature is 43.54 ℃; the internal circulation air outlet temperature of the D group core is 33.17 ℃, and the external circulation air outlet temperature is 33.70 ℃; the internal circulation air outlet temperature of the group E machine core is 37.17 ℃, and the external circulation air outlet temperature is 37.78 ℃; the internal circulation air outlet temperature of the F group machine core is 40.31 ℃, and the external circulation air outlet temperature is 40.75 ℃.
As shown in fig. 6, the internal circulation air outlet is a mixture of air output by the cores in the groups D, E and F. Therefore, the internal circulation air-out temperature of the core is the average value of the internal circulation air-out temperatures of the cores of the D group, the E group and the F group, and the calculation result is as follows:
namely the final air outlet temperature of the inner circulation of the machine core is 36.88 ℃.
The heat exchange efficiency E can be obtained according to the formula (1):
the heat exchange amount can be obtained according to the formula (2):
the analysis shows that under the conditions that the inner circulation air volume and the outer circulation air volume are 5500 m/h respectively, the inner circulation inlet temperature is 45 ℃ and the outer circulation inlet temperature is 30 ℃, the heat exchange efficiency of the heat exchanger can reach 54.1%, the inner circulation outlet air temperature is 36.88 ℃ and the heat exchange quantity is 8.09KW.
In contrast, the ventilation, dehumidification and heat dissipation integrated machine 100 operates under the state of unequal air volume, so that the ventilation, dehumidification and heat dissipation integrated machine has less electric energy consumption and higher heat exchange efficiency during operation. The following description will be given by way of example.
After the wind turbine starts working, the processor 400 reads the detection value of the inner circulation air inlet temperature sensor 420 in real time. When the temperature of the internal circulation air inlet 11 detected by the internal circulation air inlet temperature sensor 420 reaches 36 ℃, the ventilation, dehumidification and heat dissipation all-in-one machine is started, the processor 400 sends an opening control signal to the external circulation fan speed regulation switch 450 and the internal circulation fan speed regulation switch 460, according to data stored in the memory 410 in the earlier stage, according to the external circulation air volume Ym detected by the external circulation fan sensor 440, Y1 closest to Ym is found in the memory 410, the internal circulation air volume is regulated to X1 through the internal circulation fan speed regulation switch 460, so that the internal circulation fan air volume is always smaller than the external circulation fan air volume, when the temperature of the internal circulation air inlet 11 is reduced to 36 ℃ or below, the processor 400 sends a closing control signal to the external circulation fan speed regulation switch 450 and the internal circulation fan speed regulation switch 460, and the internal and external circulation fans stop running.
According to calculation of plate type heat exchange type selection software, when the ventilation, dehumidification and heat dissipation all-in-one machine 100 works under the conditions that the air volume of an inner circulation fan is 4000 m/h and the air volume of an outer circulation fan is 5500 m/h, the inner circulation inlet temperature is assumed to be 45 ℃, the outer circulation inlet temperature is assumed to be 30 ℃, the heat exchange efficiency E is 58.3%, the inner circulation outlet temperature is 35.42 ℃, and the heat exchange quantity is as follows:
compared with the heat exchange efficiency and the heat exchange quantity in the previous embodiment, the heat exchange efficiency is 54.1 percent when the air flow is equal, the heat exchange quantity is 8.09KW, the heat exchange efficiency is 58.3 percent when the air flow is unequal in the whole process, and the heat exchange quantity is 8.40KW, so that the heat exchange efficiency and the heat exchange quantity when the air flow is unequal are remarkably improved.
In summary, the ventilation, dehumidification and heat dissipation all-in-one machine for the wind power generation equipment provided by the invention has the following effects: (1) The ventilation, dehumidification and heat dissipation integrated machine can achieve the purposes of saving energy and improving heat exchange efficiency by adjusting the size of the internal circulation air volume to enable the internal circulation air volume to be smaller than the external circulation air volume; (2) By utilizing 3 working states of equal air volume, unequal air volume and intermittent state, higher heat exchange quantity, heat exchange efficiency and energy-saving requirements can be considered; (3) Because the sea surface air contains more water vapor and salt, the ventilation, dehumidification and heat dissipation integrated machine has stronger corrosion resistance by selecting materials with good corrosion resistance, and has three functions of ventilation, dehumidification and heat dissipation; (4) The internal circulation axial flow fan adopts a high-temperature axial flow fan, and low-temperature grease used in the fan ensures that the ventilation, dehumidification and heat dissipation all-in-one machine has a larger survival temperature range, can normally work within the range of-40 ℃ to +90 ℃, and is suitable for wind power generation, particularly severe working environments such as offshore wind power generation and the like.
The ventilation, dehumidification and heat dissipation all-in-one machine and the air volume adjusting method for the wind power generation equipment provided by the invention are explained in detail above. It will be apparent to those skilled in the art that any obvious modifications thereof can be made without departing from the spirit of the invention, which infringes the patent right of the invention and bears the corresponding legal responsibility.
Claims (10)
1. A ventilation, dehumidification and heat dissipation integrated machine facing wind power generation equipment is characterized by comprising a processor, a memory, an internal circulation air inlet temperature sensor, an internal circulation air outlet temperature sensor, an external circulation fan speed regulation switch and an internal circulation fan speed regulation switch; wherein,
the processor is connected with the temperature sensor of the internal circulation air inlet;
the processor is connected with the speed regulation switch of the external circulation fan and used for sending a switch control signal to the speed regulation switch;
the processor is connected with the speed regulating switch of the internal circulation fan and is used for sending switch control and speed regulating signals to the speed regulating switch;
the external circulation fan speed regulating switch is used for controlling the external circulation axial flow fan to be turned on or turned off;
the inner circulation fan speed regulation switch is used for controlling the opening or closing of the inner circulation axial flow fan and regulating the rotating speed.
2. The integrated ventilation, dehumidification and heat dissipation machine of claim 1, further comprising a housing; the shell comprises an internal circulation air inlet, an internal circulation air outlet, an external circulation air inlet and an external circulation air outlet; wherein,
the internal circulation air inlet is positioned on the bottom surface of the shell; the internal circulation air outlet is cylindrical and is positioned at the top of the shell;
the external circulation air inlet is positioned on one side wall of the shell and is connected with an opening of the tower barrel; the external circulation air outlet is positioned on the other side wall of the shell, is opposite to the external circulation air inlet and is connected with the other opening of the tower barrel.
3. A ventilation, dehumidification and heat dissipation all-in-one machine as recited in claim 2, further comprising an internal circulation axial flow fan and an external circulation axial flow fan;
the internal circulation axial flow fan is positioned in the internal circulation air outlet, and the air outlet faces to the cabin space;
the external circulation axial flow fan is positioned in the external circulation air outlet.
4. A ventilation, dehumidification and heat dissipation all-in-one machine as recited in claim 3 further comprising a heat exchanger core;
the heat exchanger core is positioned in the shell and comprises a plurality of machine cores, end plates, wrap angles and epoxy aluminum foils; the end plates are arranged on the front surface and the back surface of each movement, and the wrap angles are arranged on the four edges of each movement and used for fixing the internal epoxy aluminum foil.
5. An air volume adjusting method of a ventilation, dehumidification and heat dissipation all-in-one machine as claimed in any one of claims 1 to 4 is characterized by comprising the following steps:
s1: obtaining the temperature of an air inlet of the internal circulation, judging whether the temperature reaches a low temperature value or a high temperature value, and entering a step S2 if the temperature is between the low temperature value and the high temperature value;
s2: calculating to obtain external circulation air quantity Ym according to the rotating speed detected by the external circulation fan sensor, and entering the step S3;
s3: according to the external circulation air volume Ym, searching the internal circulation air volume Xn corresponding to the maximum heat exchange efficiency under the external circulation air volume Ym from a state data table stored in a memory;
s4: and the processor sends a signal for adjusting the rotating speed of the internal circulation axial flow fan to the speed adjusting switch of the internal circulation fan so as to adjust the internal circulation air quantity to the internal circulation air quantity Xn, and then the step S1 is returned.
6. The air volume adjusting method according to claim 5, characterized by further comprising, after the step S4:
s5: after the preset time, the processor reads the actual temperature value t of the internal circulation air outlet detected by the internal circulation air outlet temperature sensor and the pre-obtained temperature value t of the internal circulation air outlet h2 By comparison, if t> t h2 Increasing the step length of the internal circulation air quantity until t =t h2 + Delta; if t ≦ t h2 Stopping adjusting the internal circulation air quantity; wherein, delta is a preset temperature range, t h2 In a state data table, the air dry bulb temperature at the internal circulation outlet corresponding to the maximum heat exchange efficiency in the state data table.
7. The air volume adjusting method according to claim 6, characterized by further comprising, after the step S5:
s6: and when the temperature of the internal circulation air inlet is higher than the high temperature value, the processor sends a signal for adjusting the rotating speed of the internal circulation axial flow fan to the speed-adjusting switch of the internal circulation fan so as to adjust the internal circulation air quantity to the external circulation air quantity Ym, and then the step S1 is returned.
8. The air volume adjusting method according to claim 7, characterized by further comprising, after said step S6:
s7: and when the temperature of the internal circulation air inlet is higher than the high temperature value, the processor sends out the speed regulation switch of the internal circulation fan to regulate the rotating speed of the internal circulation axial flow fan to a preset low speed or stop, and then the step S1 is returned.
9. The air volume adjusting method according to claim 5, characterized in that:
and the state data table is obtained by measuring each internal circulation air volume Xn and an external circulation air volume Ym value corresponding to each internal circulation air volume Xn according to a preset air volume interval, calculating to obtain corresponding heat exchange efficiency Enm, and then correspondingly storing each internal circulation air volume Xn, each external circulation air volume Ym value and each heat exchange efficiency Enm.
10. The air volume adjusting method according to claim 9, characterized in that:
the state data table is further based on the internal circulation air outlet temperature t corresponding to each internal circulation air quantity Xn h2 Calculating to obtain corresponding heat exchange efficiency Enm, and then calculating the internal circulation air volume Xn, the external circulation air volume Ym and the internal circulation air outlet temperature t h2 And the heat exchange efficiency Enm is correspondingly stored to obtainIn (1).
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| 张金鹏: "空调换热器性能分析及优化", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120667180A (en) * | 2025-07-28 | 2025-09-19 | 中交一公局集团有限公司 | Tunnel construction ventilation device |
| CN120667180B (en) * | 2025-07-28 | 2026-01-30 | 中交一公局集团有限公司 | Construction ventilation unit in tunnel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115370545B (en) | 2023-01-24 |
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