CN202056042U - Control system of refrigeration compressor capable of preventing liquid impact - Google Patents
Control system of refrigeration compressor capable of preventing liquid impact Download PDFInfo
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- CN202056042U CN202056042U CN2011201565576U CN201120156557U CN202056042U CN 202056042 U CN202056042 U CN 202056042U CN 2011201565576 U CN2011201565576 U CN 2011201565576U CN 201120156557 U CN201120156557 U CN 201120156557U CN 202056042 U CN202056042 U CN 202056042U
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- compressor
- controller
- control system
- refrigeration
- refrigeration compressor
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Abstract
The utility model provides a control system of a refrigeration compressor capable of preventing liquid impact, which comprises a controller connected with an alarm and a displayer and a compressor (1). The exhaust end of the compressor (1) is connected with a condenser (6) through an exhaust pipeline, and the gas return end of the compressor (1) is connected with an evaporator (3) through a gas return pipeline (2). A pressure sensor and a temperature sensor which are connected with the controller are installed inside the gas return pipeline (2) respectively, and a contactor of the compressor (1) is connected with the controller. The control system of the refrigeration compressor can effectively avoid the liquid impact of the compressor, eliminates potential safety hazards existing in the operation condition of the compressor, improves security coefficient of the compressor, and prolongs service life of the compressor.
Description
Technical field
The utility model relates to a kind of refrigerating field dry type evaporating system that is applied to, and prevents the control system of compressor liquid hammer.
Background technique
In dry type sweat cooling system, evaporimeter frosting seriously arrives to a certain degree, evaporator fan breaks down and can not turn round, the refrigerating capacity of compressor output is greater than the vaporizer heat exchange quantity, both mate unreasonable, the throttle expansion valve fault of vaporizer all can cause the refrigeration agent in the refrigeration system evaporator fully not evaporate, and the unevaporated refrigerant liquid of part is sucked by compressor.Because liquid can not be compressed, and causes compressor mechanical failure and potential faults, cause compressor to remain in operation when serious, and have a strong impact on the working life of compressor.This phenomenon is commonly called as and is " liquid hammer ".
Owing to still there is not a kind of reliably anti-liquid hammer control system, preventing liquid hammer at present is return-air frosting situation by the manual observation compressor, judges whether compressor exists back the liquid phenomenon.The shortcoming of this method is: can not grasp the liquid fraction in system's return-air in real time, therefore can't effectively control compressor and suck liquid, can not prevent the generation of liquid hit phenomenon timely and effectively.
The model utility content
Technical problem to be solved in the utility model is, provides a kind of refrigeration compressor to prevent the liquid hammer control system, by real-time monitoring to the system overheat degree, and the generation of prevention liquid hit phenomenon.
The utility model has adopted following technological scheme.
A kind of refrigeration compressor is prevented the liquid hammer control system, comprise the controller that is connected with alarm and display device, also comprise compressor, the exhaust end of compressor is connected with condenser by exhaust duct, the air return end of compressor is connected with vaporizer by return-air duct, it is characterized in that: be separately installed with the pressure transducer and the temperature transducer that are connected with described controller in described return-air duct; The contactor of compressor is connected with described controller.
Described condenser is connected with described vaporizer by refrigerant feed liquid solenoid valve, the refrigeration agent expansion throttling valve of series connection mutually; Described refrigerant feed liquid solenoid valve is connected with described controller.
Described controller is PLC, microcomputer controller, a kind of in process control machine and the computer.
The degree of superheat described in the utility model is meant, in the refrigeration system, and the refrigerant gas temperature that compressor sucks, promptly described inhalation temperature T
1With evaporating temperature T
0Poor: Δ T=T
1-T
0, in dry type sweat cooling system, according to different working condition requirements, it is controlled overheated to guarantee that refrigeration agent that compressor sucks has, and refrigeration agent is fully evaporated, and when the degree of superheat is higher than certain value, illustrate that refrigeration agent gasification this moment is abundant.And when the degree of superheat is lower than certain value, illustrate there is proportion of liquid in the refrigeration agent this moment that the refrigeration agent gasification is insufficient, there is liquid hammer hidden danger.
Good effect of the present utility model is:
Utilize system of the present utility model, can the real-time monitoring system degree of superheat, when the degree of superheat is crossed when low; controller control is reported to the police; if it is long that the degree of superheat is crossed low state duration, the protection of controller control compressor shutdown has prevented the generation of liquid hit phenomenon timely and effectively.Eliminate the potential safety hazard that compressor exists under operating conditions, improved the safety coefficient of compressor, prolonged the working life of compressor.Native system also has outstanding feature simple in structure, reliable.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Further specify the utility model below in conjunction with drawings and Examples.
As Fig. 1, the utility model comprises the controller that is connected with alarm and display device, and described controller is PLC, microcomputer controller, a kind of in process control machine and the computer.Also comprise compressor 1, the exhaust end of compressor 1 is connected with condenser 6 by exhaust duct, and the air return end of compressor 1 is connected with vaporizer 3 by return-air duct 2.In described return-air duct 2, be separately installed with pressure transducer and the temperature transducer that is connected with described controller; The contactor of compressor 1 is connected with described controller.
Described condenser 6 is connected with described vaporizer 3 by refrigerant feed liquid solenoid valve 5, the refrigeration agent expansion throttling valve 4 of series connection mutually; Described refrigerant feed liquid solenoid valve 5 is connected with described controller.
The utility model is controlled according to following steps:
The first step, data capture and demonstration: by the pressure of inspiration(Pi) P in the pressure transducer collection refrigeration system return-air duct 2
0And show in real time, and by the inhalation temperature T in the temperature transducer collection refrigeration system return-air duct 2
1And show in real time;
In second step, degree of superheat operation method: at first, controller calculates P according to the pressure of default different refrigeration agents and the function formula of temperature
0Corresponding evaporating temperature T
0, degree of superheat Δ T=T
1-T
0And show Δ T in real time by display device;
In the 3rd step, control step: controller compares analysis with Δ T and setting super heat value K:
As Δ T during less than K, controller sends the degree of superheat and crosses low alarm signal, and by display device display alarm state;
If greater than the delay time of setting, controller control compressor is out of service less than the state duration of K for Δ T, and the running state that shows compressor by display device output alarm signal simultaneously.
Claims (3)
1. a refrigeration compressor is prevented the liquid hammer control system, comprise the controller that is connected with alarm and display device, also comprise compressor (1), the exhaust end of compressor (1) is connected with condenser (6) by exhaust duct, the air return end of compressor (1) is connected with vaporizer (3) by return-air duct (2), it is characterized in that: be separately installed with pressure transducer and the temperature transducer that is connected with described controller in described return-air duct (2); The contactor of compressor (1) is connected with described controller.
2. refrigeration compressor as claimed in claim 1 is prevented the liquid hammer control system, it is characterized in that: described condenser (6) is connected with described vaporizer (3) by refrigerant feed liquid solenoid valve (5), the refrigeration agent expansion throttling valve (4) of series connection mutually; Described refrigerant feed liquid solenoid valve (5) is connected with described controller.
3. refrigeration compressor as claimed in claim 1 or 2 is prevented the liquid hammer control system, it is characterized in that: described controller is PLC, microcomputer controller, a kind of in process control machine and the computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201565576U CN202056042U (en) | 2011-05-17 | 2011-05-17 | Control system of refrigeration compressor capable of preventing liquid impact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201565576U CN202056042U (en) | 2011-05-17 | 2011-05-17 | Control system of refrigeration compressor capable of preventing liquid impact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202056042U true CN202056042U (en) | 2011-11-30 |
Family
ID=45016013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201565576U Expired - Lifetime CN202056042U (en) | 2011-05-17 | 2011-05-17 | Control system of refrigeration compressor capable of preventing liquid impact |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202056042U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197596A (en) * | 2014-09-18 | 2014-12-10 | 山东宏力热泵能源股份有限公司 | Self-control device for low-temperature liquid impact prevention of refrigeration compressor and self-control method |
| WO2018090626A1 (en) * | 2016-11-17 | 2018-05-24 | 广东美的暖通设备有限公司 | Anti-slugging control method and control apparatus for air-conditioning system, and air-conditioning system |
| CN110553440A (en) * | 2019-09-04 | 2019-12-10 | 广东美的暖通设备有限公司 | Multi-split system, liquid impact prevention control method and device and readable storage medium |
-
2011
- 2011-05-17 CN CN2011201565576U patent/CN202056042U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197596A (en) * | 2014-09-18 | 2014-12-10 | 山东宏力热泵能源股份有限公司 | Self-control device for low-temperature liquid impact prevention of refrigeration compressor and self-control method |
| WO2018090626A1 (en) * | 2016-11-17 | 2018-05-24 | 广东美的暖通设备有限公司 | Anti-slugging control method and control apparatus for air-conditioning system, and air-conditioning system |
| CN110553440A (en) * | 2019-09-04 | 2019-12-10 | 广东美的暖通设备有限公司 | Multi-split system, liquid impact prevention control method and device and readable storage medium |
| CN110553440B (en) * | 2019-09-04 | 2021-07-27 | 广东美的暖通设备有限公司 | Multi-split system, liquid impact prevention control method and device and readable storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111130 |