CN201637008U - Energy saving control device of central air conditioning - Google Patents
Energy saving control device of central air conditioning Download PDFInfo
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- CN201637008U CN201637008U CN200920205794XU CN200920205794U CN201637008U CN 201637008 U CN201637008 U CN 201637008U CN 200920205794X U CN200920205794X U CN 200920205794XU CN 200920205794 U CN200920205794 U CN 200920205794U CN 201637008 U CN201637008 U CN 201637008U
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Abstract
The utility model relates to an air conditioning control device, particularly to an energy saving control device of a central air conditioning. The device comprises a water pump control cabinet, a cooling tower, a water distributor, a cooling water pump, a chilled water pump, a water collector, a bottom end and a central air conditioning. A control cabinet (19) is connected with the water pump control cabinet, a pressure sensor is arranged at the outlet part of the cooling water pump, a temperature sensor is arranged at the cooling water inlet and outlet main pipe part of the central air conditioning, a temperature sensor is arranged at the chilled water inlet and outlet main pipe part of the central air conditioning, and a pressure sensor is arranged at the outlet part of the chilled water pump. All temperature sensors and pressure sensors are connected with the control cabinet (19) and exchange information with the control cabinet (19). The device can control parameters to reasonably reflect system load conditions and make a water pump system better adapt to load variation. The device adopts large temperature difference, small flow rate and pressure monitoring. Intelligent remote control can be realized, the operation is simple, and the energy saving effect is remarkable.
Description
Technical field:
The utility model relates to air conditioning control device, especially the energy-saving control device of central air-conditioning.
Background technology:
Along with developing rapidly of market economy, the energy has not satisfied the needs in market far away, and the state of energy breach can not take on a new look in the suitable period, and therefore country is based on exploitation and energy-conservation energy policy of laying equal stress on.Especially based on the secondary energy sources electric energy of saves valuable, the user of China's electric energy maximum is a motor, accounts for 60%, and wherein the power consumption of blower fan water pump accounts for 35% of whole electric energy.The air quantity of traditional blower fan water pump, the adjusting of the water yield are the adjustings by air door, choke valve.When the needs of air quantity, the water yield reduced, the aperture of air door, valve reduced; When the needs of air quantity, the water yield increased, the aperture of air door, valve increased.Though this regulative mode is simple, become custom, it is increasing the pipe network loss, expend a large amount of energy on air door, valve for cost.And in design, the design capacity of user's blower fan water pump all exceeds much than actual needs usually, and the phenomenon of " low load with strong power " that so easy formation it has often been said causes a large amount of wastes of electric energy.
If adopt the mode of control rate to control flow, just can fundamentally prevent waste of energy.Along with the development of Power Electronic Technique, variable-frequency control technique is more and more ripe in recent years, therefore promotes the application of frequency control on blower fan, pump apparatus, and energy waste is significant for reducing.
Frequency Converter Control pump energy saving effect is obvious, and gain quick return, and convenient management, is effective conservation measures of very suitable development and popularization.Simultaneously, behind the employing frequency conversion system, improve efficiency of motor, improve its service condition, increase the service life; Reduce cooling water amount, reduce blowdown; Reduce the noise of motor and cooling tower.In sum, the pump variable frequency energy-saving control system is a power-saving technology that effect is remarkable, safe and reliable, will bring great economic benefit to the user
Summary of the invention:
The purpose of this utility model is to provide a kind of central air-conditioning energy control device of saves energy.
It comprises the water pump switch board, cooling tower, water knockout drum, cooling water pump, chilled water pump, water collector, end and central air conditioner main machine; Switch board (19) is set connects the water pump switch board respectively, in the cooling water pump exit pressure sensor is set, at central air conditioner main machine cooling water Inlet and outlet water house steward place temperature sensor is set, at central air conditioner main machine chilled water Inlet and outlet water house steward place temperature sensor is set, pressure sensor is set in the chilled water pump exit; Each temperature sensor all is connected with switch board (19) and exchange message with pressure sensor.
Switch board (19) surface is provided with touch-screen (10), cabinet door handle (11), button and indicator lamp (12), electric degree is represented window (13), switch board base (14), input and output wire hole (15), radiator fan (16), frequency converter is installed base plate (17), switch board dividing plate (18).
Frequency Converter Control panel (1) is set, central controller (7), frequency converter 1 (2), frequency converter 2 (20), air switch (3), kilowatt-hour meter (4), Switching Power Supply (5), control relay (6), contactor (8), input and output terminal (9) in the switch board (19).
Central controller (7) adopts following electrically connecting: ABCDEF to be respectively freezing Inlet and outlet water temperature sensor, cooling Inlet and outlet water temperature sensor, freezing discharge pressure sensor, cooling discharge pressure sensor; Its P end is connected to 0 to 5 pin of central controller (7) W110 respectively, is connected to 9 pin of central controller (7) W110 behind its Com end short circuit; 21 of central controller (7) is connected the 24V of Switching Power Supply (5) and 0V end respectively with 22 pin; Be connected to the 0V end of Switching Power Supply (5) behind 8, the 9 pin short circuits of the E110 card of central controller (7), 0 to 4 pin of the E110 card of central controller (7) connects an end of the normally opened contact of KA11, KA21,1KA1,2KA1,3KA1 respectively, and is connected to the 24V end of Switching Power Supply (5) behind the other end short circuit of this normally opened contact; 11,12 pin of central controller (7) are connected to the RS485 end of frequency converter 1,2 (2) by the multiple twin shielding line; The PGU PORT of central controller (7) is connected to the RS232 communication port of touch-screen (10) by the RS232 line.
Frequency converter 1 (2) adopts following electrically connecting: the 1QF input is connected to bus ABC, and output is connected to the power input of frequency converter 1 (2) by L1, L2, L3; 4,5 pin of frequency converter 1 (2) are connected to 11,12 pin of central controller (7) by the multiple twin shielding line; The R2A of frequency converter 1 (2) is connected to coil one end of KA12, KA10 by No. 10 line, the other end of KA12, KA10 coil is connected to the 24V of Switching Power Supply (5), be connected to the 0V of Switching Power Supply (5) behind the R2C pin of frequency converter 1 (2) and the R1C pin short circuit, the R1A pin of bpq1 is connected to coil one end of KA11 by No. 11 lines, and the coil other end of KA11 is connected to the 24V of Switching Power Supply (5); The output pin UVW of frequency converter 1 (2) is connected to the upper end of KM1, KM1 ', KM2, KM2 ' respectively, the lower end of KM1 is connected to 1U1,1V1, the 1W1 of M1, the lower end of KM1 ' is connected to 1U01,1V01, the 1W01 of M1, the lower end of KM2 is connected to 2U1,2V1, the 2W1 of M2, and the lower end of KM2 ' is connected to the 2U01 of M2,2V01,12W01.
Frequency converter 2 (20) adopts the following 2QF of electrically connecting input to be connected to bus ABC, and output is connected to the power input of frequency converter 2 (20) by L1, L2, L3; 4,5 pin of frequency converter 2 (20) are connected to 11,12 pin of central controller (7) by the multiple twin shielding line; The R2A of frequency converter 2 (20) is connected to coil one end of KA22, KA20 by No. 20 lines, the other end of KA22, KA20 coil is connected to the 24V of Switching Power Supply (5), be connected to the 0V of Switching Power Supply (5) behind the R2C pin of frequency converter 2 (20) and the R1C pin short circuit, the R1A pin of frequency converter 2 (20) is connected to coil one end of KA21 by No. 21 lines, and the coil other end of KA21 is connected to the 24V of Switching Power Supply (5); The output pin UVW of frequency converter 2 (20) is connected to the upper end of KM3, KM3 ' respectively, and the lower end of KM3 is connected to the 3U1 of M3,3V1,3W1, and the lower end of KM3 ' is connected to the 3U01 of M3,3V01,3W01.
The DC DC circuit adopts the input of following electrically connecting: 4QF to connect the A phase line by 4A, 4N connects the N line, the 4QF output is connected to the power input of Switching Power Supply (5) by 41, No. 42 lines, and the output output 0-24V dc source of Switching Power Supply (5) is connected to the terminal that respectively needs dc source.
Its advantage of the utility model is:
1. the reflection system loading situation of control Rational Parameters makes water pump system more can adapt to load variations.
2. consider the situation of whole cooling system behind the pump variable frequency comprehensively, adopt the big temperature difference, the control method of low discharge is taked pressure monitor simultaneously, avoids the rough sledding that may occur.
3. control procedure intellectuality can realize remote monitoring.
4. easy and simple to handle, energy-saving effect is more obvious.
This energy saving of system effect is remarkable, and average power saving rate is up to 42%.
Description of drawings:
Accompanying drawing 3 is the utility model switch board ventilation and heat control loop electrical schematic diagrams;
Accompanying drawing 5 is that the utility model # 1 variable frequency pump switches, the control loop electrical schematic diagram;
Accompanying drawing 8 is that the utility model # 2 variable frequency pump switches, the control loop electrical schematic diagram;
Accompanying drawing 10 is No. 3 water pump interlockings of the utility model input and output terminal electrical schematic diagrams;
Accompanying drawing 12 is the utility model DC24V Switching Power Supply wiring diagrams;
Accompanying drawing 13 is the utility model touch-screen wiring diagrams;
Accompanying drawing 14 is that the utility model switch board is opened inner main TV structure figure behind the panel;
Accompanying drawing 15 is the utility model switch board front views;
Accompanying drawing 16 is the utility model switch board vertical views;
Accompanying drawing 17 is the utility model switch board rearviews;
Accompanying drawing 18 is the right pseudosections of the utility model switch board;
Accompanying drawing 19 is system of the present utility model control block diagrams.
The specific embodiment:
Present embodiment comprises the water pump switch board, cooling tower, water knockout drum, cooling water pump, chilled water pump, water collector, end and central air conditioner main machine; Switch board (19) is set connects the water pump switch board respectively, in the cooling water pump exit pressure sensor is set, at central air conditioner main machine cooling water Inlet and outlet water house steward place temperature sensor is set, at central air conditioner main machine chilled water Inlet and outlet water house steward place temperature sensor is set, pressure sensor is set in the chilled water pump exit; Each temperature sensor all is connected with switch board (19) and exchange message with pressure sensor.
Switch board (19) surface is provided with touch-screen (10), cabinet door handle (11), button and indicator lamp (12), electric degree is represented window (13), switch board base (14), input and output wire hole (15), radiator fan (16), frequency converter is installed base plate (17), switch board dividing plate (18).
Frequency Converter Control panel (1) is set, central controller (7), frequency converter 1 (2), frequency converter 2 (20), air switch (3), kilowatt-hour meter (4), Switching Power Supply (5), control relay (6), contactor (8), input and output terminal (9) in the switch board (19).
Central controller (7) adopts following electrically connecting: ABCDEF to be respectively freezing Inlet and outlet water temperature sensor, cooling Inlet and outlet water temperature sensor, freezing discharge pressure sensor, cooling discharge pressure sensor; Its P end is connected to 0 to 5 pin of central controller (7) W110 respectively, is connected to 9 pin of central controller (7) W110 behind its Com end short circuit; 21 of central controller (7) is connected the 24V of Switching Power Supply (5) and 0V end respectively with 22 pin; Be connected to the 0V end of Switching Power Supply (5) behind 8, the 9 pin short circuits of the E110 card of central controller (7), 0 to 4 pin of the E110 card of central controller (7) connects an end of the normally opened contact of KA11, KA21,1KA1,2KA1,3KA1 respectively, and is connected to the 24V end of Switching Power Supply (5) behind the other end short circuit of this normally opened contact; 11,12 pin of central controller (7) are connected to the RS485 end of frequency converter 1,2 (2) by the multiple twin shielding line; The PGU PORT of central controller (7) is connected to the RS232 communication port of touch-screen (10) by the RS232 line.
Frequency converter 1 (2) adopts following electrically connecting: the 1QF input is connected to bus ABC, and output is connected to the power input of frequency converter 1 (2) by L1, L2, L3; 4,5 pin of frequency converter 1 (2) are connected to 11,12 pin of central controller (7) by the multiple twin shielding line; The R2A of frequency converter 1 (2) is connected to coil one end of KA12, KA10 by No. 10 line, the other end of KA12, KA10 coil is connected to the 24V of Switching Power Supply (5), be connected to the 0V of Switching Power Supply (5) behind the R2C pin of frequency converter 1 (2) and the R1C pin short circuit, the R1A pin of bpq1 is connected to coil one end of KA11 by No. 11 lines, and the coil other end of KA11 is connected to the 24V of Switching Power Supply (5); The output pin UVW of frequency converter 1 (2) is connected to the upper end of KM1, KM1 ', KM2, KM2 ' respectively, the lower end of KM1 is connected to 1U1,1V1, the 1W1 of M1, the lower end of KM1 ' is connected to 1U01,1V01, the 1W01 of M1, the lower end of KM2 is connected to 2U1,2V1, the 2W1 of M2, and the lower end of KM2 ' is connected to the 2U01 of M2,2V01,12W01.
Frequency converter 2 (20) adopts the following 2QF of electrically connecting input to be connected to bus ABC, and output is connected to the power input of frequency converter 2 (20) by L1, L2, L3; 4,5 pin of frequency converter 2 (20) are connected to 11,12 pin of central controller (7) by the multiple twin shielding line; The R2A of frequency converter 2 (20) is connected to coil one end of KA22, KA20 by No. 20 lines, the other end of KA22, KA20 coil is connected to the 24V of Switching Power Supply (5), be connected to the 0V of Switching Power Supply (5) behind the R2C pin of frequency converter 2 (20) and the R1C pin short circuit, the R1A pin of frequency converter 2 (20) is connected to coil one end of KA21 by No. 21 lines, and the coil other end of KA21 is connected to the 24V of Switching Power Supply (5); The output pin UVW of frequency converter 2 (2) is connected to the upper end of KM3, KM3 ' respectively, and the lower end of KM3 is connected to the 3U1 of M3,3V1,3W1, and the lower end of KM3 ' is connected to the 3U01 of M3,3V01,3W01.
The DC DC circuit adopts the input of following electrically connecting: 4QF to connect the A phase line by 4A, 4N connects the N line, the 4QF output is connected to the power input of Switching Power Supply (5) by 41, No. 42 lines, and the output output 0-24V dc source of Switching Power Supply (5) is connected to the terminal that respectively needs dc source.
The utility model is installed must a clean environment (pollution index is for being lower than 2), avoids strong electromagnetic and dust (as carbon fiber, salt etc.), has avoided water directly to spray into.The environment for use temperature should not be lower than 0 degree, and should not surpass 55 degree; Relative humidity should be lower than 95% and do not produce condensed water, and avoids the sunlight direct projection.If will note enough cooling when being installed in a power distribution cabinet and the protection box to frequency converter.Its Inside Air Temperature can not surpass 50 degree.
Switch board is installed in by the existing water pump switch board, is convenient to the leader cable wiring, and cable kalamein flexible pipe and power supply and switch board link, and fixes on the wall.
Temperature acquisition is in the import and export water pipe of freezing, the cooling water system position near water pump.Measured value directly reads on the switch board man-machine interface.
No matter the user opens any wherein a main frame and variable frequency pump, can both so both satisfy the customer charge needs according to user's load monitoring in real time and control output, do not waste again.
The temperature signal cable is fixed on roof with pvc pipe and becomes 90 degree to intersect with crane span structure.
The realization distribution system connects with water pump, realizes switchover operation between many water pumps, the power consumption when metering worker, frequency conversion.
During metering power frequency power consumption, ammeter must have the metering quality certification.
Should be fully during power frequency operation and frequency-changing control system throw off, power consumption is recorded by ammeter, gets the power consumption that two day average are per hour calculated power frequency operation.
Power consumption measures with ammeter during converting operation.
Use the timer record running time.
Power supply indication, water pump operation indication, power frequency frequency conversion indication etc. are arranged on the switch board panel.Switch the switching device shifter of frequency conversion and power frequency cashier's office in a shop has been installed, the user can be converted to the switching of power frequency, is interlocking for a certain pump.The utility model does not change the former design of user.The user is intrinsic to be controlled at power frequency time operation is constant, in addition, also can switch between converting operation water pump and the reserve pump.If wherein fault has appearred in a water pump, can in time switch to the same converting operation of another water pump.Switching controls has interlock, guarantees the safety of water pump and frequency converter.System in service monitors in real time to water pump, when faults such as water pump overcurrent, overheated, stall, stops water pump automatically and sends warning, has protected the safety of system.
The necessary when mounted vertical installation frequency converter of the utility model has suitable cooling to guarantee it.Do not make distance between any two frequency converters less than 150mm.Should avoid on the top of other unit, then installing frequency converter.
If frequency converter is installed in power distribution room, then can establish a binding post more, convert three output lines of frequency converter to be sent to motor six input lines.
Claims (7)
1. central air-conditioning energy control device, it comprises the water pump switch board, cooling tower, water knockout drum, cooling water pump, chilled water pump, water collector, end and central air conditioner main machine, it is characterized in that: switch board (19) is set connects the water pump switch board respectively, pressure sensor is set, temperature sensor is set at central air conditioner main machine cooling water Inlet and outlet water house steward place in the cooling water pump exit, at central air conditioner main machine chilled water Inlet and outlet water house steward place temperature sensor is set, pressure sensor is set in the chilled water pump exit; Each temperature sensor all is connected with switch board (19) and exchange message with pressure sensor.
2. central air-conditioning energy control device as claimed in claim 1, it is characterized in that: switch board (19) surface is provided with touch-screen (10), cabinet door handle (11), button and indicator lamp (12), electric degree are represented window (13), switch board base (14), input and output wire hole (15), radiator fan (16), frequency converter is installed base plate (17), switch board dividing plate (18).
3. central air-conditioning energy control device as claimed in claim 1, it is characterized in that: Frequency Converter Control panel (1) is set in the switch board (19), central controller (7), frequency converter 1 (2), frequency converter 2 (20), air switch (3), kilowatt-hour meter (4), Switching Power Supply (5), control relay (6), contactor (8), input and output terminal (9).
4. as claim 1 or 3 described central air-conditioning energy control device, it is characterized in that: central controller (7) adopts following electrically connecting: ABCDEF to be respectively freezing Inlet and outlet water temperature sensor, cooling Inlet and outlet water temperature sensor, freezing discharge pressure sensor, cooling discharge pressure sensor; Its P end is connected to 0 to 5 pin of central controller (7) W110 respectively, is connected to 9 pin of central controller (7) W110 behind its Com end short circuit; 21 of central controller (7) is connected the 24V of Switching Power Supply (5) and 0V end respectively with 22 pin; Be connected to the 0V end of Switching Power Supply (5) behind 8, the 9 pin short circuits of the E110 card of central controller (7), 0 to 4 pin of the E110 card of central controller (7) connects an end of the normally opened contact of KA11, KA21,1KA1,2KA1,3KA1 respectively, and is connected to the 24V end of Switching Power Supply (5) behind the other end short circuit of this normally opened contact; 11,12 pin of central controller (7) are connected to the RS485 end of frequency converter 1,2 (2) by the multiple twin shielding line; The PGU PORT of central controller (7) is connected to the RS232 communication port of touch-screen (10) by the RS232 line.
5. as claim 1 or 3 described central air-conditioning energy control device, it is characterized in that: frequency converter 1 (2) adopts following electrically connecting: the 1QF input is connected to bus ABC, and output is connected to the power input of frequency converter 1 (2) by L1, L2, L3; 4,5 pin of frequency converter 1 (2) are connected to 11,12 pin of central controller (7) by the multiple twin shielding line; The R2A of frequency converter 1 (2) is connected to coil one end of KA12, KA10 by No. 10 line, the other end of KA12, KA10 coil is connected to the 24V of Switching Power Supply (5), be connected to the 0V of Switching Power Supply (5) behind the R2C pin of frequency converter 1 (2) and the R1C pin short circuit, the R1A pin of bpq1 is connected to coil one end of KA11 by No. 11 lines, and the coil other end of KA11 is connected to the 24V of Switching Power Supply (5); The output pin UVW of frequency converter 1 (2) is connected to the upper end of KM1, KM1 ', KM2, KM2 ' respectively, the lower end of KM1 is connected to 1U1,1V1, the 1W1 of M1, the lower end of KM1 ' is connected to 1U01,1V01, the 1W01 of M1, the lower end of KM2 is connected to 2U1,2V1, the 2W1 of M2, and the lower end of KM2 ' is connected to the 2U01 of M2,2V01,12W01.
6. as claim 1 or 3 described central air-conditioning energy control device, it is characterized in that: frequency converter 2 (20) adopts the following 2QF of electrically connecting input to be connected to bus ABC, and output is connected to the power input of frequency converter 2 (20) by L1, L2, L3; 4,5 pin of frequency converter 2 (20) are connected to 11,12 pin of central controller (7) by the multiple twin shielding line; The R2A of frequency converter 2 (20) is connected to coil one end of KA22, KA20 by No. 20 lines, the other end of KA22, KA20 coil is connected to the 24V of Switching Power Supply (5), be connected to the 0V of Switching Power Supply (5) behind the R2C pin of frequency converter 2 (20) and the R1C pin short circuit, the R1A pin of frequency converter 2 (20) is connected to coil one end of KA21 by No. 21 lines, and the coil other end of KA21 is connected to the 24V of Switching Power Supply (5); The output pin UVW of frequency converter 2 (20) is connected to the upper end of KM3, KM3 ' respectively, and the lower end of KM3 is connected to the 3U1 of M3,3V1,3W1, and the lower end of KM3 ' is connected to the 3U01 of M3,3V01,3W01.
7. as claim 1 or 3 described central air-conditioning energy control device, it is characterized in that: the DC DC circuit adopts the input of following electrically connecting: 4QF to connect the A phase line by 4A, 4N connects the N line, the 4QF output is connected to the power input of Switching Power Supply (5) by 41, No. 42 lines, and the output output 0-24V dc source of Switching Power Supply (5) is connected to the terminal that respectively needs dc source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920205794XU CN201637008U (en) | 2009-09-30 | 2009-09-30 | Energy saving control device of central air conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920205794XU CN201637008U (en) | 2009-09-30 | 2009-09-30 | Energy saving control device of central air conditioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201637008U true CN201637008U (en) | 2010-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920205794XU Expired - Fee Related CN201637008U (en) | 2009-09-30 | 2009-09-30 | Energy saving control device of central air conditioning |
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| CN (1) | CN201637008U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062459A (en) * | 2010-12-24 | 2011-05-18 | 东莞市虹德电子有限公司 | Energy-saving control system of central air conditioner |
| CN103528168A (en) * | 2013-11-01 | 2014-01-22 | 珠海格力电器股份有限公司 | Air conditioning system operation control method, device, system host and air conditioning system |
| CN104734182B (en) * | 2013-12-24 | 2017-01-18 | 珠海格力电器股份有限公司 | Central air conditioner control method and system |
| CN111023432A (en) * | 2019-12-31 | 2020-04-17 | 百尔制冷(无锡)有限公司 | Control system and method for heat pump parallel unit |
| US12078378B1 (en) | 2016-09-02 | 2024-09-03 | John R. Williams | Continuously variable chiller and control systems, methods, and apparatuses |
-
2009
- 2009-09-30 CN CN200920205794XU patent/CN201637008U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062459A (en) * | 2010-12-24 | 2011-05-18 | 东莞市虹德电子有限公司 | Energy-saving control system of central air conditioner |
| CN103528168A (en) * | 2013-11-01 | 2014-01-22 | 珠海格力电器股份有限公司 | Air conditioning system operation control method, device, system host and air conditioning system |
| CN103528168B (en) * | 2013-11-01 | 2016-09-14 | 珠海格力电器股份有限公司 | Air conditioning system operation control method, device, system host and air conditioning system |
| CN104734182B (en) * | 2013-12-24 | 2017-01-18 | 珠海格力电器股份有限公司 | Central air conditioner control method and system |
| US12078378B1 (en) | 2016-09-02 | 2024-09-03 | John R. Williams | Continuously variable chiller and control systems, methods, and apparatuses |
| CN111023432A (en) * | 2019-12-31 | 2020-04-17 | 百尔制冷(无锡)有限公司 | Control system and method for heat pump parallel unit |
| CN111023432B (en) * | 2019-12-31 | 2024-06-07 | 百尔制冷(无锡)有限公司 | Control system and method for heat pump parallel unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20110930 |