CN111649509A - Intelligent refrigerant filling control system - Google Patents
Intelligent refrigerant filling control system Download PDFInfo
- Publication number
- CN111649509A CN111649509A CN202010397644.4A CN202010397644A CN111649509A CN 111649509 A CN111649509 A CN 111649509A CN 202010397644 A CN202010397644 A CN 202010397644A CN 111649509 A CN111649509 A CN 111649509A
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- Prior art keywords
- refrigerant
- conditioning system
- air conditioning
- control system
- vacuum pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/001—Charging refrigerant to a cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/002—Collecting refrigerant from a cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/003—Control issues for charging or collecting refrigerant to or from a cycle
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control system, and provides a safe and reliable intelligent refrigerant filling control system with simple structure, convenient operation, full-automatic identification control, time and labor saving, which solves the problems of manual operation in the prior art, time and labor waste, and is easy to cause the technical problems of safety problem and resource waste, etc. due to improper operation or misoperation, it comprises an air-conditioning system, the high-pressure end and the low-pressure end of the air-conditioning system are connected with a vacuum pump and a recovery machine or a refrigerant filling tank through control valves, the air conditioning system is provided with a pressure sensor, the detection information of the pressure sensor is transmitted to the control system through the wireless communication module, the control system controls the access state of the control valve after analysis and treatment, the size of the corresponding path drift diameter is selected to control the starting and stopping of the vacuum pump and the recovery machine, the communication of the air conditioning system and the vacuum pump, the recovery machine or the refrigerant filling tank and the communication.
Description
Technical Field
The invention relates to a control system, in particular to a safe and reliable intelligent refrigerant filling control system which is simple to operate and has automatic identification control in the whole process and time and labor saving.
Background
The refrigerant filling operation steps of the existing air conditioning system generally comprise a plurality of steps such as recovery, vacuum pumping, filling and the like, but the following problems are often existed in the process:
because whole manual operation, and the in-process needs operating personnel to monitor at any time by equipment, the position of relevant valve still needs manual regulation during the period, if control the refrigerant flow through the degree of opening of adjusting the valve, not only waste time and energy, and operating personnel's operation experience is showing very much, and misoperation or maloperation can direct influence entire system's fail safe nature.
Because there is not accurate sensing detection device (including vacuum degree, temperature, pressure, weight etc.) in the dynamic operation process, if at the evacuation in-process, can't accurate detect the vacuum degree value of system, the vacuum degree also can only be based on operator's experience and makes the judgement, therefore artificial influence factor is great, if realize the required vacuum degree through long-time operation, not only waste time and energy consumption, and the effect of evacuation is also not certain very good, consequently there is very big waste of resources.
Disclosure of Invention
The invention mainly provides the intelligent refrigerant filling control system which is convenient to operate, automatic in whole process identification and control, time-saving, labor-saving, safe and reliable, and solves the technical problems that manual operation in the prior art wastes time and labor, and safety problems and resource waste are easily caused by misoperation or misoperation.
The technical problem of the invention is mainly solved by the following technical scheme: the utility model provides a refrigerant intelligence filling control system, includes air conditioning system, and air conditioning system's high, low pressure end passes through the control valve to be connected on vacuum pump and recovery machine or the refrigerant jar of annotating be equipped with pressure sensor on the air conditioning system, pressure sensor's detection information passes through wireless communication module to control system, and control system controls the access state of control valve again after the analysis processing to the size that corresponds the access latus rectum when selecting control vacuum pump and recovery machine to open and stop, air conditioning system and vacuum pump, recovery machine or the intercommunication of annotating the refrigerant jar and intercommunication. Through setting up pressure sensor at air conditioning system, monitor air conditioning system's pressure state at any time through pressure sensor, pressure sensor acquires after surveying the data, again transmit control system through wireless communication module, wireless communication module can be bluetooth or wireless wifi etc, all kinds of data pass through control system's integrated processing, the retransmission instruction is opened with automatic selection control vacuum pump and recovery machine and is stopped, air conditioning system and vacuum pump, the intercommunication of recovery machine or filling refrigerant jar, and each corresponds the state such as the size of route latus rectum during the intercommunication, like the opening of access valve, close, and the size of aperture etc, with the operation requirement under the various operating modes of adaptation, thereby guarantee entire system's safe and reliable operation, full automation discernment control, convenient operation, and labour saving and time saving, and work efficiency is improved.
Preferably, the control valve is provided with a high-pressure passage and a low-pressure passage which are respectively butted with a high-pressure end and a low-pressure end of the air conditioning system, the high-pressure passage and the low-pressure passage are communicated with the vacuum pump and the recovery machine or the refrigerant filling tank through an electric three-way valve, and the electric three-way valve is connected with the control system. The electric three-way valve is arranged on the connecting passage, and the passage communication mode is selected through the electric three-way valve, namely the air conditioning system is connected with the vacuum pump, the air conditioning system is connected with the recovery machine or the refrigerant filling tank, the vacuumizing operation and the refrigerant recovery or the refrigerant filling are correspondingly executed, the structure is simple, the operation mode of the intelligent control system is completely separated from the manual operation, and the time and the labor are saved.
Preferably, the control valves corresponding to the high-pressure end and the low-pressure end of the air conditioning system are respectively provided with an electric flow control valve, and the electric flow control valves are connected with the control system through wireless communication modules. The electric flow control valve can be a needle valve, a ball valve, a butterfly valve, a gate valve and the like, and the opening degree of the passage is controlled through the electric flow control valve, so that the electric flow control valve is simple and convenient.
Preferably, the refrigerant filling tank is arranged on the wireless electronic scale, and the wireless electronic scale is connected with the control system through Bluetooth. The coolant filling amount of the system can be intelligently and accurately controlled through the wireless electronic scale.
Preferably, when the air conditioning system is vacuumized, the starting time of the vacuum pump is earlier than the pipeline communication between the air conditioning system and the vacuum pump; and the vacuum pump is closed later than the pipeline between the air conditioning system and the vacuum pump is cut off. In order to maintain the original pressure in the system, particularly after a period of vacuumizing, when the vacuumizing is suspended and restarted manually or under other conditions, if the flow control valve is opened firstly, the external air can be leaked into the air conditioning system through the vacuum pump, so that the original vacuum degree of the air conditioning system is deteriorated, the vacuumizing time can be prolonged, when the vacuum degree transmitted by the vacuum sensor reaches the set vacuum value, the flow control valve is closed firstly, then the vacuum pump is closed, and if the vacuum pump is closed firstly, the condition that the air enters the air conditioning system from the vacuum pump can also occur.
Preferably, when the refrigerant filling of the air conditioning system is started, the refrigerant filling tank and the pipeline of the air conditioning system are in a continuous state from a closed state to a fully opened state, and the time for the refrigerant filling tank to reach the fully opened state is 3 to 5 seconds. Because a larger pressure difference exists between the refrigerant filling tank and the air conditioning system in the early stage of refrigerant filling, if the passage is opened instantly, huge impact force is generated on the air conditioning system, the influence is generated on the air conditioning system, and certain potential safety hazards exist, so that the flow control valve of the intelligent control passage is opened gradually to be shorter to the maximum use time when filling is started, the impact force on the air conditioning system is reduced, and the safety and reliability are improved.
Preferably, when the refrigerant filling of the air conditioning system is close to finishing, the refrigerant filling tank and the pipeline of the air conditioning system are in a continuous state from a fully opened state to a closed state, and the time for the refrigerant filling tank to reach the closed state is 0.5 to 1 second. When the weight of the refrigerant filled by the air conditioning system is about to reach the set value, the flow valve control valve is closed gradually, so that the drift diameter of the passage is gradually reduced to be extremely short when the passage is completely closed, and the accurate control of the actual refrigerant filling amount under the dynamic condition is ensured.
Preferably, when the refrigerant of the air conditioning system is recovered, the pipeline of the recovery machine and the pipeline of the air conditioning system are in a continuous state from a closed state to a fully opened state, and the pipeline takes 3 to 5 seconds from the closed state to the fully opened state. Because the air conditioning system and the recovery machine have larger pressure difference in the early recovery period, the flow control valve of the passage is gradually opened to the maximum, the time is shorter, and the impact of the high pressure of the air conditioning system on the recovery machine can be reduced.
Preferably, the recycling refrigerant tank on the recycling machine is placed on the wireless electronic scale, the wireless electronic scale is connected with the control system through the wireless communication module, and when the recycling refrigerant tank is close to the maximum weight-bearing set value, pipelines of the recycling machine and the air conditioning system are in a continuous state from a fully open state to a closed state, and the pipeline takes 0.5 to 1 second when the recycling refrigerant tank is close to the closed state. The weight of the refrigerant stored in the refrigerant recovery tank can not exceed 80% of the capacity of the refrigerant recovery tank, so that a corresponding recovery weight value is preset according to the size of the refrigerant recovery tank, and before the weight reaches a set value, the drift diameter is reduced gradually until the time of complete closing is extremely short, so that the accuracy of actually recovering the refrigerant is controlled.
Preferably, temperature sensors are respectively arranged on communication pipelines between the high-pressure end and the low-pressure end of the air conditioning system and the control valve. The quantity of the refrigerants in the system can be judged according to the types of the refrigerants through the detection value of the temperature sensor, so that subsequent operations can be conveniently executed, the quantity of the refrigerants in the system can be increased or decreased, and the air-conditioning system can be guaranteed to reliably run in the best state.
Therefore, the intelligent refrigerant filling control system has the following advantages:
automatic control and simple operation;
data are collected through the pressure sensor, and the data of the wireless communication module realize whole-process intelligent control;
the control system analyzes and processes the data and quickly transmits the data to the execution element, so that the method is quick, accurate, safe and reliable;
the opening of the valve is automatically adjusted, and the system is ensured to normally operate under the safest working condition.
Description of the drawings:
FIG. 1 is a schematic structural view of a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a second embodiment of the present invention;
fig. 3 is a flow chart of the operation of the present invention.
The specific implementation mode is as follows:
the technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1:
as shown in fig. 1 and fig. 3, the intelligent refrigerant filling control system of the present invention includes an air conditioning system 1, a high-pressure end and a low-pressure end of the air conditioning system 1 are both connected to a control valve 2, the control valve 2 is provided with a high-pressure passage 21, a low-pressure passage 22 and an electric three-way valve 23, an open end of the high-pressure passage 21 is communicated with the high-pressure end of the air conditioning system 1, an open end of the low-pressure passage 22 is communicated with the low-pressure end of the air conditioning system 1, the other ends of the high-pressure passage 21 and the low-pressure passage 22 are connected to a port of the electric three-way valve 23, the other two ports of the electric three-way valve 23 are respectively connected to a vacuum pump 3 and a recycling machine 4, an output end of the recycling machine 4 is connected to a recycling refrigerant tank 41, the recycling refrigerant tank 41 is placed on a wireless electronic scale, the communication pipelines between the high-pressure end and the low-pressure end of the air conditioning system 1 and the control valve 2 are respectively provided with a temperature sensor 10, the high-pressure passage 21 and the low-pressure passage 22 are respectively provided with a pressure sensor 6 and an electric flow control valve 8, the electric flow control valve 8 is also connected with the control system 7 through a wireless communication module, the detection information of the pressure sensor 6 is transmitted to the control system 7 through the wireless communication module, the control system 7 controls the passage state of the control valve 2 after analysis and treatment so as to selectively control the communication between the air conditioning system 1 and the vacuum pump 3 and the recovery machine 4, and the size and the switch of the corresponding passage are adjusted by controlling the electric flow control valve 8 during the communication.
When the air-conditioning system 1 is vacuumized, transmitting a signal to the vacuum pump 3 to enable the vacuum pump 3 to execute a starting operation command; when the vacuum value reaches the set target vacuum degree, the passage is closed, meanwhile, a signal is transmitted to the vacuum pump 3, the vacuum pump 3 executes a stop command, the starting time of the vacuum pump 3 is earlier than the pipeline communication time of the air conditioning system 1 and the vacuum pump 3, the closing time of the vacuum pump 3 is later than the pipeline cut-off time of the air conditioning system 1 and the vacuum pump 3, and the two time differences are generally controlled within 2 seconds.
When the air conditioning system 1 is in refrigerant recovery operation, a signal is transmitted to the recovery machine 4, so that the recovery machine 4 executes a starting operation command; when the recovered weight reaches the set target weight, the passage is closed and a signal is transmitted to the recovery machine 4 at the same time, so that the recovery machine 4 executes a stop command, and the recovery machine 4 and the pipeline of the air conditioning system 1 are in a continuous constant-speed change state (namely the opening degree of the electric flow control valve 8) from a closed state to a fully opened state and take 3 to 5 seconds to the fully opened state. And when the refrigerant recovery tank 41 is close to the maximum loading capacity (the maximum capacity of the refrigerant recovery tank 41 is usually the safe capacity value, and is usually 80% of the real capacity), the pipelines of the recovery machine 4 and the air conditioning system 1 are in a continuous constant-speed change state from a fully open state to a closed state, and the time taken to reach the fully closed state is 0.5 to 1 second.
The wireless communication module in this embodiment adopts bluetooth transmission.
Example 2:
as shown in fig. 2, the control valve 2 is connected to the vacuum pump 3 and the refrigerant charging tank 5, and the refrigerant charging tank 5 is placed on the wireless electronic scale 9.
When the air conditioning system 1 is subjected to refrigerant filling operation, at the beginning of the operation, the filling refrigerant tank 5 and the pipeline of the air conditioning system 1 are in a continuous constant-speed change state from a closed state to a fully open state, and the time for the filling refrigerant tank to reach the fully open state is 3 to 5 seconds.
When the refrigerant filling of the air conditioning system 1 is about to end, the refrigerant filling tank 5 and the pipeline of the air conditioning system 1 are in a continuous constant-speed change state from a fully open state to a closed state, and the time for the refrigerant filling tank to reach the fully closed state is 0.5 to 1 second. The rest is exactly the same as in example 1.
The specific embodiments described herein are merely illustrative of the principles of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a refrigerant intelligence filling control system, includes air conditioning system (1), and the high, low pressure end of air conditioning system (1) is passed through control valve (2) and is connected on vacuum pump (3) and recovery machine (4) or filling refrigerant jar (5), its characterized in that: the air conditioning system (1) is provided with a pressure sensor (6), detection information of the pressure sensor (6) is transmitted to the control system (7) through the wireless communication module, the control system (7) controls the access state of the control valve (2) after analysis and processing so as to selectively control the starting and stopping of the vacuum pump (3) and the recovery machine (4), and the communication between the air conditioning system (1) and the vacuum pump (3), the recovery machine (4) or the refrigerant filling tank (5) and the size of the corresponding access diameter during the communication.
2. The refrigerant intelligent filling control system according to claim 1, characterized in that: the control valve (2) is provided with a high-pressure passage (21) and a low-pressure passage (22) which are respectively butted with a high-pressure end and a low-pressure end of the air conditioning system (1), the high-pressure passage (21) and the low-pressure passage (22) are communicated with a vacuum pump (3) and a recovery machine (4) or a refrigerant filling tank (5) through an electric three-way valve (23), and the electric three-way valve (23) is connected with a control system (7).
3. The refrigerant intelligent filling control system according to claim 1, characterized in that: and the control valves (2) corresponding to the high-voltage end and the low-voltage end of the air conditioning system (1) are respectively provided with an electric flow control valve (8), and the electric flow control valves (8) are connected with a control system (7) through a wireless communication module.
4. The refrigerant intelligent filling control system according to claim 1, characterized in that: the refrigerant filling tank (5) is arranged on the wireless electronic scale (9), and the wireless electronic scale (9) is connected with the control system (7) through the wireless communication module.
5. The refrigerant intelligent filling control system according to claim 1, characterized in that: when the air conditioning system (1) is vacuumized, the starting time of the vacuum pump (3) is earlier than the pipeline communication between the air conditioning system (1) and the vacuum pump (3); the vacuum pump (3) is closed later than the pipeline between the air conditioning system (1) and the vacuum pump (3) is cut off.
6. The refrigerant intelligent filling control system according to claim 1, characterized in that: when the refrigerant filling of the air conditioning system (1) is started, the refrigerant filling tank (5) and a pipeline of the air conditioning system (1) are in a continuous state from a closed state to a fully opened state, and the refrigerant filling tank and the pipeline take 3 to 5 seconds when the refrigerant filling tank and the pipeline reach the fully opened state.
7. The refrigerant intelligent filling control system according to the refrigerant claim 1, characterized in that: when the refrigerant filling of the air conditioning system (1) is nearly finished, the refrigerant filling tank (5) and a pipeline of the air conditioning system (1) are in a continuous state from a fully opened state to a closed state, and the time is 0.5 to 1 second when the refrigerant filling tank and the pipeline are in the closed state.
8. The refrigerant intelligent filling control system according to claim 1, characterized in that: and when the refrigerant of the air conditioning system (1) is recovered, the recovery machine (4) and the pipeline of the air conditioning system (1) are in a continuous state from a closed state to a fully opened state, and the pipeline takes 3 to 5 seconds when the pipeline is in the fully opened state.
9. The refrigerant intelligent filling control system according to claim 1, characterized in that: the refrigerant recovery tank (41) on the recovery machine (4) is placed on the wireless electronic scale (9), the wireless electronic scale (9) is connected with the control system (7) through the wireless communication module, and when the refrigerant recovery tank (41) is close to the maximum weight holding set value, the pipelines of the recovery machine (4) and the air conditioning system (1) are in a continuous state from a fully opened state to a closed state, and the time is 0.5 to 1 second from the fully opened state to the closed state.
10. The refrigerant intelligent filling control system according to claim 1, characterized in that: and temperature sensors (10) are respectively arranged on communicating pipelines between the high-pressure end and the low-pressure end of the air-conditioning system (1) and the control valve (2).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010397644.4A CN111649509A (en) | 2020-05-12 | 2020-05-12 | Intelligent refrigerant filling control system |
| PCT/CN2021/091366 WO2021227894A1 (en) | 2020-05-12 | 2021-04-30 | Intelligent coolant adding control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010397644.4A CN111649509A (en) | 2020-05-12 | 2020-05-12 | Intelligent refrigerant filling control system |
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| CN111649509A true CN111649509A (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010397644.4A Pending CN111649509A (en) | 2020-05-12 | 2020-05-12 | Intelligent refrigerant filling control system |
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| CN (1) | CN111649509A (en) |
| WO (1) | WO2021227894A1 (en) |
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| CN112344607A (en) * | 2020-10-13 | 2021-02-09 | 浙江飞越机电有限公司 | Intelligent control method for obtaining optimal recovery speed of refrigerant recovery machine |
| CN112378049A (en) * | 2020-10-21 | 2021-02-19 | 浙江飞越机电有限公司 | Intelligent identification and service matching management method for refrigeration equipment |
| CN112378048A (en) * | 2020-10-21 | 2021-02-19 | 浙江飞越机电有限公司 | Intelligent maintenance management system and method for refrigeration equipment |
| CN113294947A (en) * | 2021-05-25 | 2021-08-24 | 安徽万瑞冷电科技有限公司 | Automatic air charging and discharging packaging system of refrigerating machine and control method |
| CN113531963A (en) * | 2021-06-16 | 2021-10-22 | 青岛海尔空调器有限总公司 | Air conditioner debugging equipment |
| WO2021227894A1 (en) * | 2020-05-12 | 2021-11-18 | 浙江飞越机电有限公司 | Intelligent coolant adding control system |
| CN114215734A (en) * | 2021-11-05 | 2022-03-22 | 合肥通用机械研究院有限公司 | Low-pressure working medium complete recovery system and recovery method for compressor testing device |
| CN115164454A (en) * | 2022-07-11 | 2022-10-11 | 珠海格力电器股份有限公司 | Control method and control device for electronic expansion valve body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3138685A1 (en) * | 2022-08-03 | 2024-02-09 | Sndc | Connected refrigerant charging station |
| CN116538716B (en) * | 2023-04-14 | 2023-10-20 | 深圳市泰路科技有限公司 | Refrigerant recovery filling machine operation monitoring system based on data analysis |
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| WO2021227894A1 (en) * | 2020-05-12 | 2021-11-18 | 浙江飞越机电有限公司 | Intelligent coolant adding control system |
| CN112344607A (en) * | 2020-10-13 | 2021-02-09 | 浙江飞越机电有限公司 | Intelligent control method for obtaining optimal recovery speed of refrigerant recovery machine |
| CN112378049A (en) * | 2020-10-21 | 2021-02-19 | 浙江飞越机电有限公司 | Intelligent identification and service matching management method for refrigeration equipment |
| CN112378048A (en) * | 2020-10-21 | 2021-02-19 | 浙江飞越机电有限公司 | Intelligent maintenance management system and method for refrigeration equipment |
| CN113294947A (en) * | 2021-05-25 | 2021-08-24 | 安徽万瑞冷电科技有限公司 | Automatic air charging and discharging packaging system of refrigerating machine and control method |
| CN113294947B (en) * | 2021-05-25 | 2021-11-19 | 安徽万瑞冷电科技有限公司 | Automatic air charging and discharging packaging system of refrigerating machine and control method |
| CN113531963A (en) * | 2021-06-16 | 2021-10-22 | 青岛海尔空调器有限总公司 | Air conditioner debugging equipment |
| CN114215734A (en) * | 2021-11-05 | 2022-03-22 | 合肥通用机械研究院有限公司 | Low-pressure working medium complete recovery system and recovery method for compressor testing device |
| CN114215734B (en) * | 2021-11-05 | 2024-03-19 | 合肥通用机械研究院有限公司 | Low-pressure working medium complete recovery system and recovery method for compressor testing device |
| CN115164454A (en) * | 2022-07-11 | 2022-10-11 | 珠海格力电器股份有限公司 | Control method and control device for electronic expansion valve body |
| CN115164454B (en) * | 2022-07-11 | 2024-02-27 | 珠海格力电器股份有限公司 | Control method and control device for electronic expansion valve body |
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| WO2021227894A1 (en) | 2021-11-18 |
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Application publication date: 20200911 |