CN209371442U - A kind of machine room air-conditioning energy-saving device - Google Patents
A kind of machine room air-conditioning energy-saving device Download PDFInfo
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- CN209371442U CN209371442U CN201920030921.0U CN201920030921U CN209371442U CN 209371442 U CN209371442 U CN 209371442U CN 201920030921 U CN201920030921 U CN 201920030921U CN 209371442 U CN209371442 U CN 209371442U
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Abstract
The utility model provides a kind of machine room air-conditioning energy-saving device, including controller, including first control unit, the second control unit and third control unit；Frequency converter, including load wiring terminal, the switch unit being connect with first control unit and the speed adjustment unit being connect with the second control unit；First contactor, including the first main contact and the first coil connecting with the first control terminal of third control unit, the first main contact is connected between power supply terminal and three phase mains；Second contactor, including the second main contact and the first auxiliary normally closed interlock connecting with the first control terminal, the second main contact is connected between compressor and the compressor contactor of compressor, and the first auxiliary normally closed interlock is connected with first coil；Relay, including moving together contact and the second coil connecting with compressor contactor, moving together contact is connected between switch unit and first control unit.The machine room air-conditioning energy-saving device can make traditional machine room air-conditioning refrigeration system have frequency conversion control function.
Description
Technical field
The utility model relates to air-conditioning technical fields, specifically, being to be related to a kind of machine room air-conditioning energy-saving device.
Background technique
Comprehensive with internet popularizes, and data center's role in daily life, work is more and more important, especially
It is for enterprise, mechanism, and data center has become indispensable pith in its day-to-day operations, however, currently
Data center's high problem of generally existing energy consumption.According to statistics, in the electric power of supply data center, energy that information technoloy equipment occupies
The half of insufficient total energy consumption is consumed, and infrastructure device and heat dissipation equipment then occupy more than half of data center's total energy consumption,
Wherein, the energy consumption that air conditioner in machine room refrigeration system occupies is up to four one-tenth or so of data center's total energy consumption, becomes data center's operation
One of main expenditure.Therefore, in order to effectively reduce the energy consumption of computer-room air conditioning system, current way is will be traditional
The air conditioner in machine room refrigeration system with frequency conversion control function is replaced or be modified to computer-room air conditioning system.But according to replacement
Mode needs to replace entire air conditioner in machine room refrigeration system, with high costs, and due to traditional air conditioner in machine room refrigeration system
Frequency control is had no, causes the change difficulty of traditional air conditioner in machine room refrigeration system big, and also needs to freeze to air conditioner in machine room and is
The control system of system is changed comprehensively, and project amount is great.
Summary of the invention
To solve the above-mentioned problems, the main purpose of the utility model be to provide one kind can be by traditional machine room air conditioner refrigerating system
System is changed to the air conditioner in machine room refrigeration system with frequency conversion control function, and the machine room air-conditioning energy-saving that compatibility is strong, easy to connect
Device.
In order to realize the main purpose of the utility model, the utility model provides a kind of machine room air-conditioning energy-saving device, wherein
Including cabinet, controller, frequency converter, first contactor, second contactor and relay, controller is mounted in cabinet, control
Device includes that first control unit, the second control unit and third control unit, frequency converter are mounted in cabinet, and frequency converter includes electricity
Source connecting terminal, load wiring terminal, switch unit and speed adjustment unit, power supply terminal are used to be electrically connected with three phase mains,
Load wiring terminal is used to be electrically connected with compression mechatronics, switch unit with first control unit, speed adjustment unit and the second control
Unit electrical connection processed, first contactor includes the first main contact and first coil, and the first main contact is connected electrically in supply terminals
Between son and three phase mains, first coil is electrically connected with the first control terminal of third control unit, and second contactor includes second
Main contact and the first auxiliary normally closed interlock, the second main contact are connected between compressor and the compressor contactor of compressor, the
One auxiliary normally closed interlock is electrically connected with the first control terminal, and the first auxiliary normally closed interlock is connected with first coil, and relay includes
Moving together contact and the second coil, moving together contact are connected electrically between switch unit and first control unit, the second coil and compression
The electrical connection of machine contactor, and the second coil is arranged between compressor contactor and the second main contact.
Therefore by the circuit structure design to machine room air-conditioning energy-saving device, so that the machine room air-conditioning energy-saving device
It can be easily attached with traditional air conditioner in machine room refrigeration system very much, so that traditional air conditioner in machine room refrigeration system energy
Enough be switched to the air conditioner in machine room refrigeration system with frequency conversion control function, thus avoid the need for air conditioner in machine room refrigeration system into
Row replacement or comprehensively change, reduce the improvement difficulty and project amount to traditional air conditioner in machine room refrigeration system.
Further embodiment is that controller further includes the 4th control unit, and frequency converter further includes alarm unit, alarm unit
It is electrically connected with the 4th control unit, second contactor further includes tertiary coil, the second control of tertiary coil and third control unit
End electrical connection processed, machine room air-conditioning energy-saving device further includes third contactor, and third contactor includes third main contact, the 4th coil
With the second auxiliary normally closed interlock, third main contact is connected electrically between load wiring terminal and compressor, the 4th coil and first
Control terminal electrical connection, the 4th coil is connected with the first auxiliary normally closed interlock, and the 4th coil is in parallel with first coil, the second auxiliary
Normally closed interlock is electrically connected with the second control terminal, and the second auxiliary normally closed interlock is connected with tertiary coil.
Therefore designed by the connection line to second contactor and third contactor is set, so that working as frequency conversion
When device breaks down, improved air conditioner in machine room refrigeration system can be switched to original system in time by machine room air-conditioning energy-saving device,
To guarantee that air conditioner in machine room refrigeration system can continue to work.
Further scheme is that controller further includes power input unit, and machine room air-conditioning energy-saving device further includes transformation
Device, transformer are connected electrically between power input unit and two-phase power supply.
Therefore transformer is used to for the high voltage drop of two-phase power supply to be pressed into the low-voltage for meeting controller work.
Further scheme is that the first auxiliary normally closed interlock, first coil and the 4th coil are respectively electrically connected to first
Between control terminal and the firewire of two-phase power supply, the second auxiliary normally closed interlock, tertiary coil be respectively electrically connected to the second control terminal and
Between firewire.
Further scheme is that machine room air-conditioning energy-saving device further includes emergency button, and emergency button is connected electrically in second
Between control terminal and the zero curve of two-phase power supply.
Therefore the setting of emergency button enables to incite somebody to action by emergency button when controller breaks down
Improved air conditioner in machine room refrigeration system switches to original system, to guarantee that air conditioner in machine room refrigeration system can continue to carry out work
Make.
Further scheme is that machine room air-conditioning energy-saving device further includes that the first breaker, the second breaker and third are disconnected
Road device, the first circuit breaker electric are connected between two-phase power supply and transformer, and the second circuit breaker electric is connected to the first main contact and three
Between phase power supply, third circuit breaker electric is connected between the second main contact and compressor contactor, and the setting of the second coil is the
Between three breakers and the second main contact.
Therefore first breaker can when between two-phase power supply and controller occur heavy overload, short circuit or owe
When the failures such as pressure, the connection between two-phase power supply and controller is automatically cut off；Similarly, the second breaker can work as three-phase electricity
When overload, short circuit or the failures such as under-voltage occurring between source and frequency converter, the connection between three phase mains and frequency converter is automatically cut off,
Third breaker can be cut automatically when overload, short circuit or the failures such as under-voltage occur between compressor contactor and compressor
Connection between disconnected compressor contactor and compressor.
Further scheme is that machine room air-conditioning energy-saving device further includes Temperature Humidity Sensor, and controller further includes the 5th
Control unit, the 5th control unit are electrically connected with Temperature Humidity Sensor.
Therefore machine room air-conditioning energy-saving device can understand in real time the warm and humid of its working environment by Temperature Humidity Sensor
Degree, so that the temperature and humidity of the working environment is adjusted in time.
Further scheme is that machine room air-conditioning energy-saving device further includes touch display screen, and controller further includes the 6th control
Unit processed, the 6th control unit are electrically connected with touch display screen.
Therefore touch display screen had both been displayed for the working environment parameter and computer room of machine room air-conditioning energy-saving device
The current working status of energy-saving device of air conditioner can be also used for the operation such as carrying out controller parameter setting, send control instruction.
Detailed description of the invention
Fig. 1 is the structure chart of the utility model machine room air-conditioning energy-saving Installation practice.
Fig. 2 is the electrical schematic of the utility model machine room air-conditioning energy-saving Installation practice.
Fig. 3 is the enlarged drawing in Fig. 2 at A.
Fig. 4 is the enlarged drawing in Fig. 2 at B.
The following is a further explanation of the present invention with reference to the accompanying drawings and embodiments.
Specific embodiment
Referring to figs. 1 to Fig. 3, machine room air-conditioning energy-saving device 100 includes cabinet 1, controller 2, frequency converter 3, first contactor
KM1, second contactor KM2, third contactor KM3, transformer 4, emergency button SB, the first breaker MCB1, the second breaker
MCB2, third breaker MCB3, Temperature Humidity Sensor 5 and touch display screen 6.Wherein, controller 2, frequency converter 3, first contact
Device KM1, second contactor KM2, third contactor KM3, transformer 4, the first breaker MCB1, the second breaker MCB2 and third
Breaker MCB3 is arranged in cabinet 1.
Frequency converter 3 includes power supply terminal 31, load wiring terminal 32, switch unit 33, speed adjustment unit 34 and alarm
Unit 35.Frequency converter 3 is electrically connected by power supply terminal 31 with three phase mains, and passes through load wiring terminal 32 and original machine room
The compressor 7 of air-conditioning refrigeration system is electrically connected, so that frequency converter 3 can be controlled and be adjusted to 7 revolving speed of compressor, is made
Compressor 7 remains at optimal rotary regimes, to improve the Energy Efficiency Ratio of air conditioner in machine room refrigeration system.
Controller 2 includes first control unit 21, the second control unit 22, third control unit 23, the 4th control unit
24, the 5th control unit 25, the 6th control unit 26 and power input unit 27.External power supply power supply passes through power input unit
27 pairs of controllers 2 are powered, and specifically, power input unit 27 is electrically connected by transformer 4 with two-phase power supply, wherein is become
Depressor 4 can be by 220 volts of voltage step-down of two-phase power supply at 24 volts of voltage.
First control unit 21 is electrically connected with the switch unit 33 of frequency converter 3, keeps controller 2 single by the first control
Member 21 controls frequency converter 3 and is started.Second control unit 22 is electrically connected with the speed adjustment unit 34 of frequency converter 3, so that controller 2
Different speed-regulating signals can be sent to frequency converter 3 by the second control unit 22, so that frequency converter 3 be made to receive speed regulation letter
After number, the revolving speed of compressor 7 is adjusted correspondingly.And in order to avoid frequency converter 3 is to the pressure of original machine room air-conditioning refrigeration system
When contracting machine 7 is controlled, the compressor contactor 71 of compressor 7 interferes frequency converter 3, and therefore, it is necessary to connect by first
Tentaculum KM1 and second contactor KM2 switch over the driving of frequency converter 3 and compressor contactor 71.
Specifically, first contactor KM1 includes the first main contact and first coil, the main touching of the first of first contactor KM1
Head be connected electrically between the power supply terminal 31 of frequency converter 3 and three line power supplys, the first coil of first contactor KM1 be electrically connected
It connects between the firewire of two-phase power supply and the first control terminal N03 of third control unit 23.Second contactor KM2 includes second main
Contact and the first auxiliary normally closed interlock, the second main contact of second contactor KM2 are connected electrically in compressor contactor 71 and compression
Between machine 7, the first auxiliary normally closed interlock of second contactor KM2 is connected electrically in the first control terminal N03 of third control unit 23
Between the firewire of two-phase power supply, and the First Line of the first auxiliary normally closed interlock and first contactor KM1 of second contactor KM2
Circle series connection.
In addition, can be contacted using relay K to compressor in order to avoid controller 2 carries out error control to compressor 7
The first control unit 21 of device 71 and controller 2 is electrically connected.Specifically, relay K includes moving together contact and the second coil,
Wherein, the moving together contact of relay K be connected electrically in frequency converter 3 switch unit 33 and controller 2 first control unit 21 it
Between, the second coil of relay K is electrically connected with two in the three-phase electric connection terminal of compressor contactor 71, and relay
The second coil of device K is arranged between compressor contactor 71 and the second main contact of second contactor KM2, to avoid second
The second main contact of contactor KM2 is cutting off compressor contactor 71 with compressor 7 when being electrically connected, and the dynamic circuit connector of relay K is touched
Point can not be closed.
The alarm unit 35 of frequency converter 3 is electrically connected with the 4th control unit 24 of controller 2, so that working as frequency converter 3
When failure, controller 2 can cut off frequency converter 3 to compressor 7 after the alarm signal for receiving the sending of alarm unit 35
Control, and control compressor contactor 71 and be electrically connected again with compressor 7, so that air conditioner in machine room refrigeration system reverts to
Original system.
In order to effectively cutting off control of the frequency converter 3 to compressor 7, and guarantee that compressor contactor 71 can be with
Compressor 7 re-starts reliable electrical connection, can be combined by second contactor KM2 and third contactor KM3 to assist this
Control loop is controlled.Specifically, second contactor KM2 further includes tertiary coil, the tertiary coil electricity of second contactor KM2
It is connected between the second control terminal N01 of third control unit 23 and the firewire of two-phase power supply.Third contactor KM3 includes third
Main contact, the 4th coil and the second auxiliary normally closed interlock, the third main contact of third contactor KM3 are connected electrically in frequency converter 3
Between load wiring terminal 32 and compressor 7, the 4th coil of third contactor KM3 is connected electrically in the of third control unit 23
Between one control terminal N03 and the firewire of two-phase power supply.The 4th coil of third contactor KM3 and the first of second contactor KM2
Normally closed interlock series connection is assisted, and the 4th coil of third contactor KM3 is in parallel with the first coil of first contactor KM1.Third
The fire of second control terminal N01 and two-phase power supply of the second auxiliary normally closed interlock electrical connection third control unit 23 of contactor KM3
Between line, and the second normally closed interlock is connected with the tertiary coil of second contactor KM2, so that second contactor KM2 and third connect
Interlocking is realized between tentaculum KM3.
Emergency button SB is connected electrically between the second control terminal N01 of third control unit 23 and the zero curve of two-phase power supply,
Emergency button SB is used to air conditioner in machine room refrigeration system is reverted to original system, to guarantee machine when controller 2 breaks down
Room air-conditioning refrigeration system can continue to work.
First breaker MCB1 is connected electrically between two-phase power supply and transformer 4, with when two-phase power supply and controller 2 it
Between when heavy overload, short circuit or the failures such as under-voltage occur, automatically cut off the connection between two-phase power supply and controller 2.Second is disconnected
Road device MCB2 is connected electrically between the first main contact of first contactor KM1 and three phase mains, to work as three phase mains and frequency conversion
When overload, short circuit or the failures such as under-voltage occurring between device 3, the connection between three phase mains and frequency converter 3 is automatically cut off.Third is disconnected
Road device MCB3 is connected electrically between the second main contact of second contactor KM2 and compressor contactor 71, to connect when compressor
When overload, short circuit or the failures such as under-voltage occurring between tentaculum 71 and compressor 7, compressor contactor 71 and compressor are automatically cut off
Connection between 7.
Temperature Humidity Sensor 5 is electrically connected with the 5th control unit 25 of controller 2, and Temperature Humidity Sensor 5 is used for detection machine
The temperature and humidity of the working environment of room energy-saving device of air conditioner 100 in order to which controller 2 judges whether to need to start frequency converter 3, and makes
Machine room air-conditioning energy-saving device 100 can in time be adjusted the temperature and humidity of its working environment.
Touch display screen 6 is electrically connected with the 6th control unit 26 of controller 2, and touch display screen 6 was both displayed for
The working environment parameter of machine room air-conditioning energy-saving device 100 and the current working status of machine room air-conditioning energy-saving device 100, can also use
It is operated in carrying out parameter setting, transmission control instruction etc. to controller 2.
To sum up, by the circuit structure design to machine room air-conditioning energy-saving device 100, so that the machine room air-conditioning energy-saving device
100 can have multiple operational modes, including energy-saving mode, mechanical refrigeration mode and contingency mode, below to the work of each mode
It is briefly described as process:
It is closed the first breaker MCB1, the second breaker MCB2 and third breaker MCB3, to start machine room air-conditioning energy-saving
Device 100.
Energy-saving mode:
When controller 2 selects energy-saving mode, the first control terminal N03 output the first control letter of third control unit 23
Number, so that the third main contact of the first main contact of first contactor KM1, third contactor KM3 are closed, and due to the second contact
Device KM2 and third contactor KM3 interlocking, so that the second main contact of second contactor KM2 disconnects.At this point, controller 2, frequency conversion
Energy-saving control loop between device 3 and compressor 7 comes into force.
Then, controller 2 obtains the detection signal that Temperature Humidity Sensor 5 is sent by the 5th control unit 25, and passes through
The detection signal judges whether to start frequency converter 3.When controller 2, which is judged as, to be needed to start frequency converter 3, first control unit 21
Control terminal N06 export second control signal, and the control terminal A03 of the second control unit 22 according to detection signal export third control
Signal processed, at this point, frequency converter 3 starts and original machine room air-conditioning refrigeration system is waited to judge whether to start compressor 7.
When original machine room, air-conditioning refrigeration system is judged as when needing to start compressor 7, is electrically connected with compressor contactor 71
The second coil of relay K is connected, so that the dynamic circuit connector for the relay K being electrically connected with the first control unit 21 of controller 2
Contact closure, at this point, connecting the circuit between first control unit 21 and the switch unit 33 of frequency converter 3, and the second control letter
It number comes into force, frequency converter 3 obtains effective enabling signal and controls signal according to the third of acquisition and adjusts the speed to compressor 7.
Mechanical refrigeration mode:
When frequency converter 3 breaks down, frequency converter 3 can be by alarm unit 35 to the 4th control unit 24 of controller 2
Send alarm signal.Controller 2 judges whether according to pre-set parameter by air conditioner in machine room section after receiving alarm signal
Energy device 100 is switched to mechanical refrigeration mode, is simultaneously emitted by alarm song.
When machine room air-conditioning energy-saving device 100 needs to be switched to mechanical refrigeration mode, controller 2 is voluntarily switched to mechanical system
Cold control model, at this point, the second control terminal N01 of the third control unit 23 of controller 2 sends the 4th control signal, so that the
The second main contact of two contactor KM2 is closed, at this point, since second contactor KM2 and third contactor KM3 interlocking, second connect
The first auxiliary normally closed interlock of tentaculum KM2 is connected with the first coil of first contactor KM1, so that the of first contactor KM1
One main contact disconnects, the third main contact of third contactor KM3 disconnects, to cut off the energy conservation between frequency converter 3 and compressor 7
Control loop.At this point, the mechanical refrigeration control loop between compressor 7 and compressor contactor 71 comes into force, the complete root of compressor 7
It is opened or closed according to the operational mode of original machine room air-conditioning refrigeration system, and controller 2 is not involved in control mechanical refrigeration mode
Under compressor 7.
Contingency mode:
When controller 2 breaks down, controller 2 can not cut the operational mode of machine room air-conditioning energy-saving device 100
It changes, at this point it is possible to be emergency button SB closure directly by operation emergency button SB.When emergency button SB closure, second is connect
The tertiary coil of tentaculum KM2 is connected, so that the second main contact of second contactor KM2 is closed, original machine room air conditioner refrigerating system
System presses above-mentioned mechanical refrigeration mode operation, and the control for being detached from controller 2 carries out independent operating.Wherein, due to second contactor
KM2 and third contactor KM3 interlocking, second contactor KM2 first auxiliary normally closed interlock and first contactor KM1 First Line
Circle series connection, so that the first main contact of first contactor KM1 disconnects, the third main contact of third contactor KM3 disconnects.
To sum up, machine room air-conditioning energy-saving device 100 provided by the utility model can be by traditional machine room air-conditioning refrigeration system
It is changed to the air conditioner in machine room refrigeration system with frequency conversion control function, and has the advantages that compatibility is strong, easy to connect.
Finally it is emphasized that the above is only the preferred embodiment of the present invention, it is not limited to this reality
With novel, for those skilled in the art, the utility model can have various change and change, all in the utility model
Spirit and principle within, any modification, equivalent substitution, improvement and etc. done should be included in the protection model of the utility model
Within enclosing.
Claims (8)
1. a kind of machine room air-conditioning energy-saving device characterized by comprising
Cabinet；
Controller, the controller are mounted in the cabinet, and the controller includes first control unit, the second control unit
And third control unit；
Frequency converter, the frequency converter are mounted in the cabinet, and the frequency converter includes power supply terminal, load wiring end
Son, switch unit and speed adjustment unit, the power supply terminal for being electrically connected with three phase mains, use by the load wiring terminal
In with compression mechatronics, the switch unit is electrically connected with the first control unit, the speed adjustment unit and described second
Control unit electrical connection；
First contactor, the first contactor include the first main contact and first coil, and first main contact is connected electrically in
Between the power supply terminal and the three phase mains, the first control terminal of the first coil and the third control unit
Electrical connection；
Second contactor, the second contactor include the second main contact and the first auxiliary normally closed interlock, second main contact
It is connected electrically between the compressor and the compressor contactor of the compressor, the first auxiliary normally closed interlock and described the
The electrical connection of one control terminal, and the first auxiliary normally closed interlock is connected with the first coil；
Relay, the relay include moving together contact and the second coil, and the moving together contact is connected electrically in the switch unit
Between the first control unit, second coil is electrically connected with the compressor contactor, and second coil is set
It sets between the compressor contactor and second main contact.
2. machine room air-conditioning energy-saving device according to claim 1, it is characterised in that:
The controller further includes the 4th control unit；
The frequency converter further includes alarm unit, and the alarm unit is electrically connected with the 4th control unit；
The second contactor further includes tertiary coil, the second control terminal electricity of the tertiary coil and the third control unit
Connection；
The machine room air-conditioning energy-saving device further includes third contactor, and the third contactor includes third main contact, the 4th line
Circle and the second auxiliary normally closed interlock, the third main contact are connected electrically between the load wiring terminal and the compressor,
4th coil is electrically connected with first control terminal, and the 4th coil is connected with the first auxiliary normally closed interlock, and
4th coil is in parallel with the first coil, and the second auxiliary normally closed interlock is electrically connected with second control terminal, and
The second auxiliary normally closed interlock is connected with the tertiary coil.
3. machine room air-conditioning energy-saving device according to claim 2, it is characterised in that:
The controller further includes power input unit；
The machine room air-conditioning energy-saving device further includes transformer, and the transformer is connected electrically in the power input unit and two-phase
Between power supply.
4. machine room air-conditioning energy-saving device according to claim 3, it is characterised in that:
The first auxiliary normally closed interlock, the first coil and the 4th coil are respectively electrically connected to first control terminal
Between the firewire of the two-phase power supply；
Second auxiliary normally closed interlock, the tertiary coil be respectively electrically connected to second control terminal and the firewire it
Between.
5. machine room air-conditioning energy-saving device according to claim 4, it is characterised in that:
The machine room air-conditioning energy-saving device further includes emergency button, and the emergency button is connected electrically in second control terminal and institute
It states between the zero curve of two-phase power supply.
6. machine room air-conditioning energy-saving device according to claim 5, it is characterised in that:
The machine room air-conditioning energy-saving device further include:
First breaker, first circuit breaker electric are connected between the two-phase power supply and the transformer；
Second breaker, second circuit breaker electric are connected between first main contact and the three phase mains；
Third breaker, the third circuit breaker electric are connected between second main contact and the compressor contactor, and
Second coil is arranged between the third breaker and second main contact.
7. machine room air-conditioning energy-saving device according to claim 6, it is characterised in that:
The machine room air-conditioning energy-saving device further includes Temperature Humidity Sensor；
The controller further includes the 5th control unit, and the 5th control unit is electrically connected with the Temperature Humidity Sensor.
8. machine room air-conditioning energy-saving device according to any one of claims 1 to 7, it is characterised in that:
The machine room air-conditioning energy-saving device further includes touch display screen；
The controller further includes the 6th control unit, and the 6th control unit is electrically connected with the touch display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920030921.0U CN209371442U (en) | 2019-01-07 | 2019-01-07 | A kind of machine room air-conditioning energy-saving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920030921.0U CN209371442U (en) | 2019-01-07 | 2019-01-07 | A kind of machine room air-conditioning energy-saving device |
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| Publication Number | Publication Date |
|---|---|
| CN209371442U true CN209371442U (en) | 2019-09-10 |
Family
ID=67824828
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| CN201920030921.0U Active CN209371442U (en) | 2019-01-07 | 2019-01-07 | A kind of machine room air-conditioning energy-saving device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112977511A (en) * | 2019-12-16 | 2021-06-18 | 中车唐山机车车辆有限公司 | Rail train's air conditioning system control circuit and rail train |
-
2019
- 2019-01-07 CN CN201920030921.0U patent/CN209371442U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112977511A (en) * | 2019-12-16 | 2021-06-18 | 中车唐山机车车辆有限公司 | Rail train's air conditioning system control circuit and rail train |
| CN112977511B (en) * | 2019-12-16 | 2022-07-26 | 中车唐山机车车辆有限公司 | Rail train's air conditioning system control circuit and rail train |
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