CN102194363B - Teaching instrument for alternating-current variable-frequency multi-unit air conditioner integrated control system - Google Patents
Teaching instrument for alternating-current variable-frequency multi-unit air conditioner integrated control system Download PDFInfo
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- CN102194363B CN102194363B CN 201110141161 CN201110141161A CN102194363B CN 102194363 B CN102194363 B CN 102194363B CN 201110141161 CN201110141161 CN 201110141161 CN 201110141161 A CN201110141161 A CN 201110141161A CN 102194363 B CN102194363 B CN 102194363B
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Abstract
The invention discloses a teaching instrument for an alternating-current variable-frequency multi-unit air conditioner integrated control system. The teaching instrument comprises an air conditioner host, an electrical control system and a teaching instrument board, wherein the electrical control system comprises an electrical control component, a sensor, an outdoor unit integrated circuit board, an indoor unit integrated circuit board and an executing mechanism which is driven by the outdoor unit integrated circuit board and the indoor unit integrated circuit board; the electrical control system also comprises a lightning protection module and a frequency conversion module; the teaching instrument board comprises a circuit principle board and an electrical control mechanism board; a schematic circuit diagram of the air conditioner host is printed on the circuit principle board; an electrical control system wiring diagram is printed and the electrical control component, the lightning protection module, the frequency conversion module, the outdoor unit integrated circuit board and the indoor integrated circuit board are arranged on the front surface of the electrical control mechanism board; and a wire is connected on the back face of the electrical control mechanism board according to the electrical control system wiring diagram, so that the outdoor unit integrated circuit board and the indoor integrated circuit board on the electrical control mechanism board are electrically connected with the executing mechanism. An experimental method provided by the invention has an intuitive principle and rich content, and is particularly suitable for experimental teaching of the alternating-current variable-frequency multi-unit air conditioner integrated control system for professional students of refrigeration, electricity, household appliances and the like.
Description
The present invention relates to the instruments used for education field, more particularly, relate to a kind of AC frequency conversion multi-connected air conditioner integrated control system teaching instrument.
Background technology
AC frequency conversion multi-connected air conditioner uses the variable frequency adjustment technology; its cooling and warming speed is fast; indoor having a narrow range of temperature, comfortableness is good, and is energy-conservation again; and compressor can frequent starting; also prolonged serviceable life, noise is little, during winter heating; can in non-stop-machine situation, realize automatic defrosting, thereby be obtained widely use.But the electric control system of converter technique and cooperate the refrigeration piping control system relative complex of frequency conversion capacity adjustment, and along with the increase of tenure of use, overall performance also and then descends, and its hidden fault also rises greatly.At present, it also is not the grasp that very ripe, most service technician lacks core skills that the maintenance technique of AC frequency conversion multi-connected air conditioner is grasped, and its hidden fault can't be got rid of, and causes the cooling/heating deleterious.And enterprise also lacks the systematic study technology to hydraulic performance decline.On the other hand, because electric control system is complicated, so that there is certain difficulty in the teaching of AC frequency conversion multi-connected air conditioner technology, the knowledge such as operation mechanism study, electric assembly manipulation, fault diagnosis and maintenance are difficult to grasp, and lack visual and understandable educational aid.
Application number is that 200310116011.8 Chinese invention patent discloses portable ultra thin passive analogue electron circuit experiment box, and structure comprises casing, bread board, the test jack that is lined with the shielded metal layer in it; Case bottom side rear panel is equipped with oscillograph wiring bayonet socket, function signal generator wiring bayonet socket, power supply wiring bayonet socket and ac millivoltmeter wiring bayonet socket, is electrically connected with oscillograph patch jack, function signal generator patch jack, power supply wiring jack and the ac millivoltmeter patch jack of front plate at the bottom of the case respectively; The loam cake of casing is connected identical self-locking device to connect respectively with the front at the bottom of the case with the bottom surface; Case bottom side rear panel have be equipped with in the casing potentiometer and-5V～+ the 5V dc signal source.This invention adopts ultrathin portable design also to have buckling and locking device, make things convenient for preview behind the students in class or contrived experiment and storage transportation and Electro Magnetic Compatibility good.But this technical scheme is only applicable on some contrived experiments small-sized, relatively simple for structure, and the control system synthesis of AC frequency conversion multi-connected air conditioner converter technique, Refrigeration Technique, anti-lightning strike technology, principle of work, troubleshooting maintenance skills be more complicated all, grasps also relatively difficulty.Some teaching small-sized, that simple teaching experimental tool can not solve large-scale complicated system described above, we need to be with the circuit structure of mode display systems very intuitively, can allow the principle of work of student, the easier grasp AC frequency conversion multi-connected air conditioner of maintenance technique waiter, improve the maintenance skills level.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of electric-control system teaching appliance for the integrated control principle teaching of AC frequency conversion multi-connected air conditioner and maintenance skills combined training is provided, can realize series training and the experimental design functions such as the study of direct viewing type operation mechanism, assembly manipulation, running status indication, real time demonstration, performance follow-up study, the problem that exists to solve above-mentioned prior art.
The technical solution used in the present invention is: a kind of AC frequency conversion multi-connected air conditioner integrated control system teaching instrument comprises air conditioner host, electric-control system and teaching appliance billboard, described electric-control system comprises, sensor, the off-premises station surface-mounted integrated circuit, the indoor set surface-mounted integrated circuit, topworks by described off-premises station surface-mounted integrated circuit and the driving of indoor set surface-mounted integrated circuit, described electric-control system also comprises anti-lightning strike module and frequency-variable module, described teaching appliance billboard comprises circuit theory billboard and automatically controlled mechanism billboard, be printed with the circuit theory diagrams of air conditioner host at described circuit theory billboard, be printed with the electric-control system wiring diagram in the front of automatically controlled mechanism billboard and correspondence is equipped with automatically controlled components and parts, anti-lightning strike module, frequency-variable module, off-premises station surface-mounted integrated circuit and indoor surface-mounted integrated circuit are pressed the electric-control system wiring diagram and are connected wire so that the off-premises station surface-mounted integrated circuit on the automatically controlled mechanism billboard and indoor surface-mounted integrated circuit are electrically connected with topworks at the back side of automatically controlled mechanism billboard.
Above-mentioned AC frequency conversion multi-connected air conditioner integrated control system teaching instrument is equipped with change-over panel in the front of automatically controlled mechanism billboard, and described change-over panel is electrically connected with the delivery outlet of surface-mounted integrated circuit, and described change-over panel is electrically connected with topworks.
Above-mentioned AC frequency conversion multi-connected air conditioner integrated control system teaching instrument is provided with the check point of a plurality of electric signal parameters for detection of the place circuit in the front of circuit theory billboard and automatically controlled mechanism billboard.
Above-mentioned AC frequency conversion multi-connected air conditioner integrated control system teaching instrument is provided with the topworks status display area at automatically controlled mechanism billboard, arrange in the described topworks status display area a plurality of respectively from the display lamp of different topworks's parallel connection.
Above-mentioned AC frequency conversion multi-connected air conditioner integrated control system teaching instrument, also comprise the module of placing obstacles, the described module of placing obstacles is by a plurality of automatically controlled components and parts of placing obstacles and the switch of placing obstacles of connecting with the automatically controlled components and parts that described experiment is placed obstacles, and the described switch of placing obstacles comprises closure in normality, disconnects, sets to 0, puts 1 four kinds of states.
Above-mentioned AC frequency conversion multi-connected air conditioner integrated control system teaching instrument also is provided with the oscillograph for Real-time Collection frequency-variable module frequency signal on automatically controlled mechanism billboard.
Compared with prior art, the present invention has the following advantages:
1) AC frequency conversion multi-connected air conditioner integrated control system teaching instrument of the present invention, after the integral control circuit schematic diagram of complexity and electric-controlled parts connection mode carried out improvement and design, more directly perceived, clearly retouching can be on billboard, duty demonstration, the live signal acquisition and display of electric-control system parts have been increased simultaneously at billboard, the pcb board weak electric signal is measured and electric-control system parts forceful electric power signal measurement, more effectively improves the AC frequency conversion multi-connected air conditioner integrated control system teaching efficiency.
2) this teaching appliance also is provided with fault at billboard functional module is set, and fault can be set artificially, more is conducive to the real training exercise of fault detection and exclusion.
3) this teaching appliance is simple in structure, principle is directly perceived, is specially adapted to the experimental teaching of carrying out for general students of science and technology.
Description of drawings
Fig. 1 is the connection diagram of AC frequency conversion multi-connected air conditioner integrated control system teaching instrument of the present invention;
Fig. 2 is the electric-control system wiring schematic diagram of automatically controlled mechanism billboard;
Fig. 3 is one of off-premises station surface-mounted integrated circuit principle of work circuit diagram of circuit theory billboard;
Fig. 4 be the circuit theory billboard off-premises station surface-mounted integrated circuit principle of work circuit diagram two;
Fig. 5 be the circuit theory billboard off-premises station surface-mounted integrated circuit principle of work circuit diagram three;
Fig. 6 is the anti-lightning strike module principle of work circuit diagram of circuit theory billboard;
Fig. 7 is AC frequency conversion multi-connected air conditioner integrated control system teaching instrument billboard structure synoptic diagram.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
The refrigeration work flow process of AC frequency conversion multi-connected air conditioner of the present invention is as follows: in refrigeration cycle, invariable frequency compressor and frequency-changeable compressor suck respectively the low-temperature low-pressure refrigerant steam that produces in the evaporator, and the low-pressure state of maintenance evaporator, thereby created the condition that evaporator inner refrigerant liquid constantly seethes with excitement at low temperatures.Cold-producing medium is through compressor operating, and its temperature, pressure raise, and have created the condition that cold-producing medium can be liquefied at normal temperatures.The steam of High Temperature High Pressure is concentrated and to be discharged to oil separator and to converge, by main four-way valve and auxiliary four-way valve, enter condenser, in the situation that pressure remains unchanged, because the cooling heat dissipation effect of fan, emit heat, temperature reduces, and further condenses into liquid, discharge from condenser, enter fluid reservoir, to every indoor set electric expansion valve, condensed refrigerant liquid enters and carries out reducing pressure by regulating flow in the electric expansion valve, because hindering refrigerant liquid flows, so therefore its pressure drop has just created condition for the vaporization in evaporator, refrigerant liquid is in the situation that pressure remains unchanged, absorption be cooled medium the heat that cools off (namely producing cold) and vaporize, be accompanied by the transfer of heat, namely by the extraneous the supply system cryogen latent heat of vaporization, the result is that evaporator external and ambient air are cooled.Cold-producing medium from evaporator out after, the steam that forms low-temp low-pressure is got back to gas-liquid separator, is siphoned away by compressor again, so constantly circulation reaches refrigeration.
AC frequency conversion multi-connected air conditioner heats workflow: when heating, the change of hot and cold function in system of air-conditioning is that the solenoid operated 4-way valve in the dependence system carries out, the inverse process when the cold-producing medium trend is refrigeration.When heating state, the indoor set electric expansion valve is in full-gear, does not do throttling, and the reducing pressure by regulating flow in the heating and the degree of superheat of regulating system are finished jointly by two electric expansion valves of off-premises station.
The valve body of AC frequency conversion air conditioner refrigeration various parts such as compressor, four-way valve and each control refrigerant flow direction, the driving control of frequency-variable module are finished by integrated control system, teaching for AC frequency conversion multi-connected air conditioner refrigeration system principle can be by the process flow diagram of drawing system structure and pipeline trend, make its principle of work of student's visual understanding, and the annexation of each cooling module.But, the investigation of the driving control method of AC frequency conversion multi-connected air conditioner, the circuit theory of integrated control system, the system failure and the teaching of diagnosis just need the teaching appliance of the special electric-control system of design to finish, thereby allow the student read by study practice voluntarily and judge, cultivate student's manipulative ability, promote technical ability, be familiar with device structure, principle of work and the electric control principle of AC frequency conversion multi-connected air conditioner carried out more deep research.
As shown in Figure 1, AC frequency conversion multi-connected air conditioner is divided into refrigeration control system and two parts of electric control system, is made into respectively two teaching appliance billboard (3,2), and two billboard are connected with air conditioner host 1.A billboard carries out improvement and design for electric control system, the wiring diagram of the electric hookup of air conditioner host 1, circuit theory diagrams, automatically controlled components and parts and the various experimental design devices that increase is printed on respectively facade and the plane of structure of aforesaid teaching appliance billboard 2.Again AC frequency conversion multi-connected air conditioner main frame refrigerant system configurations is depicted as analogous diagram and is printed on the refrigeration piping system billboard 3, connect by operation circuit between two billboard.AC frequency conversion multi-connected air conditioner integrated control system teaching instrument of the present invention carries out design of Simulation to electrical control system structure characteristics, operation logic and flow process, electric control system, circuit board schematic diagram to be drawn, and is printed on respectively on the circuit theory billboard 20 and 10 two billboard of automatically controlled mechanism billboard of teaching appliance.AC frequency conversion multi-connected air conditioner integrated control system teaching instrument comprises air conditioner host 1, electric-control system and teaching appliance billboard 2 (comprising circuit theory billboard 20 and automatically controlled mechanism billboard 10), the electric-control system topworks that comprises automatically controlled components and parts, sensor, off-premises station surface-mounted integrated circuit 11, indoor set surface-mounted integrated circuit 17, driven by described off-premises station surface-mounted integrated circuit 11 and indoor set surface-mounted integrated circuit 17 wherein, and electric-control system also comprises anti-lightning strike module 8 and frequency-variable module 9.In order to allow the student learn intuitively electric-control system, be printed with the circuit theory diagrams of air conditioner at the circuit theory billboard, the wiring diagram and the correspondence that are printed with automatically controlled components and parts in the front of automatically controlled mechanism billboard are equipped with automatically controlled components and parts, frequency-variable module 9, anti-lightning strike module 8 and off-premises station surface-mounted integrated circuit 11, indoor set surface-mounted integrated circuit 17, and on the billboard circuit of each parts connect and plate on each parts (comprise off-premises station surface-mounted integrated circuit 11, indoor set surface-mounted integrated circuit 17) with the compressor of air conditioner host 1, four-way valve, the control cold-producing medium is connected the connection of each valve body and is all carried out at the back side of billboard with heating, cooperate the display lamp of reflection air conditioner host critical component duty and the oscillograph that reflects the frequency real-time parameter of AC frequency conversion multi-connected air conditioner, make structure and the principle of work of the easier grasp AC frequency conversion multi-connected air conditioner integrated control system of student, reach the purpose of being convenient to impart knowledge to students.
See Fig. 2 and Fig. 7, surface-mounted integrated circuit 11, indoor set surface-mounted integrated circuit 17 are connected the connection wiring diagram of the automatically controlled components and parts such as blower fan electric capacity, relay, A.C. contactor outside the printing office with transformer on the front of automatically controlled mechanism billboard 10, comprise that wiring schematic diagram, the off-premises station surface-mounted integrated circuit 11 of the temperature sensing circuit that is connected with off-premises station surface-mounted integrated circuit 11 input ports is connected wiring diagram etc. with compressor, blower fan; And at corresponding position installation off-premises station surface-mounted integrated circuit 11 and indoor set surface-mounted integrated circuit 17, at the automatically controlled components and parts installing zone 12 interior corresponding corresponding automatically controlled components and parts of installing, above the positive right side of face of billboard, oscillograph 15 is housed, other at oscillograph is topworks status display area 14 (topworks status display area 14 also can be located at oscillographic below), in this zone, frequency-changeable compressor is housed, the quota compressor, main four-way valve, auxiliary four-way valve, a plurality of solenoid valves, the duty display lamp of the critical components such as suction pump motor makes the real-time running state of each parts very clear.Circuit theory diagrams at circuit theory billboard 20 fronts printing AC frequency conversion multi-connected air conditioner, circuit theory diagrams are consistent with wiring diagram on automatically controlled mechanism billboard 10 fronts, when lecturing the electric-control system of AC frequency conversion multi-connected air conditioner, can explain in conjunction with the peripheral wiring of the automatically controlled components and parts that indicate on automatically controlled mechanism billboard 10 and the circuit theory billboard 20 and internal circuit principle simultaneously, can greatly improve the effect of giving lectures, make teaching more vivid, visual and understandable.And are wire areas of electric-control system at the back side of automatically controlled mechanism billboard 10 and the bottom surface of circuit theory billboard 20, finish the connection of each element on the billboard, and being connected in the wire harness groove that wire can be inserted in 1 of teaching appliance billboard 2 and air conditioner host of the parts on element and the main frame on the billboard.Simultaneously, for the driving that makes the topworkies such as compressor on surface-mounted integrated circuit and the air conditioner host on the teaching appliance billboard 2 is connected more convenient, at automatically controlled mechanism billboard 10 change-over panel 13 is housed, change-over panel is connected with topworkies such as the delivery outlet of surface-mounted integrated circuit, compressor, blower fan, four-way valves respectively.And illustrate the check point 18 that also is provided with a plurality of electric signal parameters at the back side of automatically controlled mechanism billboard 10 and the printing of circuit theory billboard 20, check point on the circuit theory billboard 20 is connected with the circuit lead of automatically controlled mechanism billboard 10, by check point being carried out voltage, the isoparametric measurement of resistance, can check, judge the real-time working state of check point place circuit, help the working mechanism of learning and communication multi-evaporator inverter air conditioner Electrical Control system.The present invention also is provided with the functional module that fault arranges at teaching appliance billboard 2, the module of placing obstacles is placed in the drawer 30 of teaching appliance billboard 2, the connection wire is drawn from the back of drawer and is connected with the circuit of automatically controlled mechanism billboard 10, the automatically controlled components and parts that the module of placing obstacles is placed obstacles by a plurality of experiments and the switch of placing obstacles that is connected with automatically controlled components and parts are formed, the switch of placing obstacles is closed under normal conditions, under the state of placing obstacles, manually open, the circuit that connects these automatically controlled components and parts of placing obstacles is disconnected, the phenomenon of fault artificially is set.The module of placing obstacles is divided into placing obstacles of strong power system and placing obstacles of weak electricity system, the weak current part experiment place obstacles as: anti-phase horse driver to SV16 open circuit, rp-drive to the RY9 relay open circuit, the SV1 relay damaged of solenoid valve, A detect the resistance damage mutually, level pressure machine exhaust temperature sensor opens circuit, the fault settings such as transformation machine exhaust temperature sensor opens circuit, frequency-variable module damage, indoor temperature transmitter damage, the damage of evaporator outlet temperature sensor.
The present invention has carried out the control mechanism displaying according to emulation electrical control wiring system, two parts of artificial circuit principle system to the AC frequency conversion multi-connected air conditioner technology, and can the Real-time Collection frequency variation signal and demonstrate its oscillogram.Crucial weak electric signal and typical forceful electric power electrical measurement point have been inserted, to the typical most common failure integrated design failure setting device of light current and forceful electric power.Adopt actual situation in conjunction with design, the material objects such as the circuit board that whole electric control system is comprised, electric components carry out true wiring at emulation electrical control wiring system figure and connect, and have realized the perfect adaptation that the true operation of electric control system and emulation mechanism are demonstrated.Realized the dry run indication of all electric topworkies.
Fig. 3 to Fig. 6 is the sub-circuit schematic diagram of AC frequency conversion multi-connected air conditioner, wherein, Fig. 3 is one of off-premises station surface-mounted integrated circuit principle of work circuit diagram, Fig. 4 is two of off-premises station surface-mounted integrated circuit principle of work circuit diagram, Fig. 5 is three of off-premises station surface-mounted integrated circuit principle of work circuit diagram, and Fig. 6 is anti-lightning strike module principle of work circuit diagram.
On refrigeration piping system billboard 3, a plurality of key position operation thermal parameter collection demonstrations and the electrical parameter that are provided with air conditioner host show, have inserted all kinds of operation valve indications and signal measurement point in the simulation flow control.Electric expansion valve can be true to nature the demonstration aperture.And on-line execute and simulation run conversion equipment have been designed.Control section to service system is provided with failed equipment.Make teaching appliance of the present invention carry out simulation operations, Long-distance Control at billboard and truly move two kinds of patterns.And realize system synthesis study, training and the experimental design functions such as running status indication, signal measurement, fault setting, signals collecting and real time demonstration, Performance figure.
Claims (6)
1. AC frequency conversion multi-connected air conditioner integrated control system teaching instrument, comprise air conditioner host (1), electric-control system and teaching appliance billboard (2), described electric-control system comprises automatically controlled components and parts, sensor, off-premises station surface-mounted integrated circuit (11), indoor set surface-mounted integrated circuit (17), topworks by described off-premises station surface-mounted integrated circuit (11) and indoor set surface-mounted integrated circuit (17) driving, described electric-control system also comprises anti-lightning strike module (8) and frequency-variable module (9), it is characterized in that: described teaching appliance billboard (2) comprises circuit theory billboard (20) and automatically controlled mechanism billboard (10), be printed with the circuit theory diagrams of air conditioner host (1) at described circuit theory billboard (20), be printed with the electric-control system wiring diagram in the front of automatically controlled mechanism billboard (10) and correspondence is equipped with automatically controlled components and parts, anti-lightning strike module (8), frequency-variable module (9), off-premises station surface-mounted integrated circuit (11) and indoor surface-mounted integrated circuit (17) are pressed the electric-control system wiring diagram and are connected wire so that the off-premises station surface-mounted integrated circuit (11) on the automatically controlled mechanism billboard (10) and indoor surface-mounted integrated circuit (17) are electrically connected with topworks at the back side of automatically controlled mechanism billboard (10).
2. AC frequency conversion multi-connected air conditioner integrated control system teaching instrument according to claim 1, it is characterized in that: change-over panel (13) is housed in the front of automatically controlled mechanism billboard, described change-over panel (13) is electrically connected with the delivery outlet of off-premises station surface-mounted integrated circuit (11), and described change-over panel (13) is electrically connected with topworks.
3. AC frequency conversion multi-connected air conditioner integrated control system teaching instrument according to claim 1 is characterized in that: the check point (18) that is provided with a plurality of electric signal parameters for detection of the place circuit in the front of automatically controlled mechanism billboard (10) and circuit theory billboard (20).
4. according to claim 2 or 3 described AC frequency conversion multi-connected air conditioner integrated control system teaching instruments, it is characterized in that: be provided with topworks status display area (14) at automatically controlled mechanism billboard, arrange in described topworks status display area (14) a plurality of respectively from the display lamp of different topworks's parallel connection.
5. AC frequency conversion multi-connected air conditioner integrated control system teaching instrument according to claim 4, it is characterized in that: also comprise the module of placing obstacles, the described module of placing obstacles is reached and the point-connected switch of placing obstacles of described automatically controlled joint by a plurality of automatically controlled nodes of placing obstacles, and the described switch of placing obstacles comprises closure, disconnects, sets to 0, puts 1 four kinds of states.
6. AC frequency conversion multi-connected air conditioner integrated control system teaching instrument according to claim 5 is characterized in that: also be provided with the oscillograph (15) for Real-time Collection frequency-variable module frequency signal on automatically controlled mechanism billboard (10).
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| CN 201110141161 CN102194363B (en) | 2011-05-27 | 2011-05-27 | Teaching instrument for alternating-current variable-frequency multi-unit air conditioner integrated control system |
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| CN 201110141161 CN102194363B (en) | 2011-05-27 | 2011-05-27 | Teaching instrument for alternating-current variable-frequency multi-unit air conditioner integrated control system |
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| CN102214408A (en) * | 2011-05-28 | 2011-10-12 | 顺德职业技术学院 | Integrated control system teaching instrument of digital intelligent vortex multi-connection air conditioner |
| CN104091510B (en) * | 2014-06-27 | 2016-05-18 | 顺德职业技术学院 | A kind of domestic air conditioning microcomputerized control technological synthesis exercise equipment |
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| CN201311728Y (en) * | 2008-11-24 | 2009-09-16 | 浙江天煌科技实业有限公司 | Practical training device of refrigerating and air-conditioning system |
| CN201667145U (en) * | 2010-04-02 | 2010-12-08 | 天津圣纳科技有限公司 | Automobile air conditioner system teaching and practical training platform |
| CN201812434U (en) * | 2010-10-19 | 2011-04-27 | 天津市优耐特汽车电控技术服务有限公司 | Teaching training platform of electric control automatic automobile air-conditioning system |
| CN202075910U (en) * | 2011-05-27 | 2011-12-14 | 顺德职业技术学院 | AC frequency conversion multi-connected air conditioner integrated control system teaching instrument |
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Patent Citations (4)
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| CN201311728Y (en) * | 2008-11-24 | 2009-09-16 | 浙江天煌科技实业有限公司 | Practical training device of refrigerating and air-conditioning system |
| CN201667145U (en) * | 2010-04-02 | 2010-12-08 | 天津圣纳科技有限公司 | Automobile air conditioner system teaching and practical training platform |
| CN201812434U (en) * | 2010-10-19 | 2011-04-27 | 天津市优耐特汽车电控技术服务有限公司 | Teaching training platform of electric control automatic automobile air-conditioning system |
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