CN104976812A - High precision dynamic control method for refrigerating capacity of compressor refrigeration system - Google Patents
High precision dynamic control method for refrigerating capacity of compressor refrigeration system Download PDFInfo
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- CN104976812A CN104976812A CN201410129511.3A CN201410129511A CN104976812A CN 104976812 A CN104976812 A CN 104976812A CN 201410129511 A CN201410129511 A CN 201410129511A CN 104976812 A CN104976812 A CN 104976812A
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- refrigeration system
- hot
- gas bypass
- magnetic valve
- compressor
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Classifications
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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
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention relates to a high precision dynamic control method for refrigerating capacity of a compressor refrigeration system. The high precision dynamic control method is a method for performing high precision dynamic control for the refrigerating capacity of the compressor refrigeration system based on one or more hot gas bypass solenoid valves. When the compressor refrigeration system refrigerates a heating element, the compressor refrigeration system heats the heating element by using hot gas bypass manner to apply the temperature fluctuation to the controlled heating element in a stable temperature range. The number of the hot gas bypass solenoid valves can be one or more.
Description
Technical field
The present invention relates to a kind of Dynamic High-accuracy control method of compressor refrigeration system refrigerating capacity, relate to one or rather
high-accuracy water coldproduct.。
Background technology
Instrument and equipment can produce a large amount of heats when running, and needs to be cooled by water, and the temperature of water inlet can not be high, can not be low, thermostatted water.
water cooling unita kind ofly exactly provide the product of constant temp cooling water for instrument and equipment.
water cooling unitby water pump, to instrument and equipment for constant temp cooling water, ensure the normal operation of instrument and equipment, return from instrument and equipment
water cooling unithigh-temperature water, must compressor refrigeration system be passed through, cool to the temperature range of instrument and equipment requirement, to recycle.
The water cooling unit of current production, refrigeration compressor mostly adopts start stop mode to control water temperature.This kind of water cooling unit comprises: compressor, condenser, expansion valve (or capillary), evaporimeter, temperature-sensing probe, water tank, water pump and electric control unit (temp controlled meter+wiring board or PLC) etc.Water cooling unit can set a compressor start temperature, and a compressor stops temperature, when the water temperature of water tank is higher than compressor start temperature, and compressor start, compressor refrigeration system is to the cycling use of water refrigeration in water tank; When the water temperature of water tank is lower than compressor stopping temperature, compressor quits work.Because compressor itself limits, after compressor quits work, need more than 3 minutes time, just can restart.In this 3 ~ 4 minutes, the water temperature in water tank can rise gradually, and when reaching compressor start temperature, compressor restarts again.So adopt the water cooling unit of start stop mode, the fluctuation range of water temperature is very large.And some precision instrument, require very high to the temperature stability of constant temp cooling water.Such as high power transmission electron microscope, requires within 0.1 DEG C/h the temperature stability of constant temp cooling water.
The object of the invention is design a kind of
high-accuracy water coldproduct, meets precision instrument and equipment, to the high-stability requirement of recirculated cooling water water temperature.
Summary of the invention
The object of the present invention is achieved like this,
high-accuracy water coldproduct, comprises compressor, hot-gas bypass magnetic valve, condenser, expansion valve (or capillary), evaporimeter, water tank, water pump, temperature-sensing probe and electric control unit (temp controlled meter+wiring board or PLC) etc.It is characterized in that there is one or more hot-gas bypass magnetic valve.
The high-pressure outlet of described refrigeration compressor, cold-producing medium is divided into two-way, and a road is refrigerating circuit, and a road is for heating loop.
refrigerating circuit: cold-producing medium, by the low pressure gas returning port of high-pressure outlet → condenser → expansion valve (or capillary) → evaporimeter → gas-liquid separator → compressor of compressor, freezes to the cycling use of water in water tank.
heat loop:cold-producing medium is by the low pressure gas returning port of the high-pressure outlet → hot-gas bypass magnetic valve → evaporimeter → gas-liquid separator → compressor of compressor, high temperature and high pressure gaseous refrigerant, by hot-gas bypass magnetic valve, access evaporimeter, heats the cycling use of water in water tank.
Described hot-gas bypass magnetic valve is connected with described electric control unit, controls its action by electric control unit.
Described electric control unit is
temp controlled meter+wiring boardor PLC.In embodiment, that electric control unit adopts is the S7-200 type PLC that Siemens Company produces.
Technology of the present invention is further illustrated below in conjunction with embodiment and accompanying drawing.
Fig. 1 is
high-accuracy water coldproduct refrigeration system principle schematic.
High-accuracy water cold product, mainly comprises compressor, condenser, capillary, hot-gas bypass magnetic valve, evaporimeter, water tank, recirculated cooling water, gas-liquid separator, water pump, temperature-sensing probe and electric control unit (PLC) etc.
The water pump of high-accuracy water cold absorbs water from water tank, and the backward instrument and equipment that pressurizes, for thermostatted water, after the heat of thermostatted water absorbing apparatus equipment, becomes the water tank that high-temperature water returns high-accuracy water cold.
The compressor refrigeration system of high-accuracy water cold, is divided into refrigeration and heats two loops.
refrigerating circuit:cold-producing medium, by the circulation of compressor high-pressure outlet → condenser → capillary → evaporimeter → gas-liquid separator → compressor low pressure gas returning port, freezes to the water in water tank.
heat loop:cold-producing medium is by the circulation of compressor high-pressure outlet → hot-gas bypass magnetic valve → evaporimeter → gas-liquid separator → compressor low pressure gas returning port, and high temperature and high pressure gaseous refrigerant, by hot-gas bypass magnetic valve, access evaporimeter, heats the water in water tank.This example adopts 3 hot-gas bypass magnetic valves.
detailed description of the invention
Described high-accuracy water cold product, adopts 3 hot-gas bypass magnetic valves.
Described high-accuracy water cold product, water pump absorbs water from water tank, and the backward instrument and equipment that pressurizes, for thermostatted water, after the heat of thermostatted water absorbing apparatus equipment, becomes the water tank that high-temperature water returns high-accuracy water cold.Temperature-sensing probe in water tank, passes to PLC by temperature signal, and PLC adopts pid parameter method, according to the variation tendency of cycling use of water temperature, controls 3 hot-gas bypass electromagnetic valve works.
Described high-accuracy water cold product, refrigeration compressor is ceaselessly working always, compressor refrigeration system, by refrigerating circuit to while the cycling use of water refrigeration in water tank, according to the caloric value of instrument and equipment, the i.e. change of cycling use of water temperature in water tank, by 3 hot-gas bypass magnetic valves, heats the cycling use of water in water tank.Make
the refrigerating capacity of the caloric value (heat by cycling use of water band recovery tank) of instrument and equipment+the heat heating capacity ≈ refrigerating circuit in loop.Reach the temperature to the cycling use of water in water tank, carry out the object of Dynamic High-accuracy control.
This example selects the hot-gas bypass magnetic valve of 3 same sizes.By the latus rectum of selection hot-gas bypass magnetic valve and the latus rectum of tube connector, when each hot-gas bypass magnetic valve is opened, the heating capacity heating loop is all 17% of overall refrigerating effect.The operating mode of such refrigeration compressor, just can meteyage cold be overall refrigerating effect 100%, refrigerating capacity be overall refrigerating effect 66%, refrigerating capacity be overall refrigerating effect 32%, refrigerating capacity is-2% four kind of operating mode of overall refrigerating effect.
When 3 hot-gas bypass magnetic valves all turn off,
now the refrigerating capacity of high-accuracy water cold is 100% of overall refrigerating effect;when 1 hot-gas bypass magnetic valve is opened, the refrigerating capacity of refrigerating circuit is 83% of overall refrigerating effect, and the heating capacity heating loop is 17% of overall refrigerating effect,
now the refrigerating capacity of high-accuracy water cold is 66% of overall refrigerating effect(83%-17%); When 2 hot-gas bypass magnetic valves are opened simultaneously, the refrigerating capacity of refrigerating circuit is 66% of overall refrigerating effect, and the heating capacity heating loop is 34% of overall refrigerating effect,
now the refrigerating capacity of high-accuracy water cold is 32% of overall refrigerating effect(66%-34%); When 3 hot-gas bypass magnetic valves are opened simultaneously, the refrigerating capacity of refrigerating circuit is 49% of overall refrigerating effect, and the heating capacity heating loop is 51% of overall refrigerating effect,
now the refrigerating capacity of high-accuracy water cold is overall refrigerating effect-2%(namely 2% heat).The refrigerating capacity of high-accuracy water cold,-2%, 32%, change between 66% and 100%, when the caloric value of instrument and equipment is 70% of high-accuracy water cold overall refrigerating effect, there is 1 hot-gas bypass magnetic valve, need to open → turn off → open → turn off, the refrigerating capacity of high-accuracy water cold, overall refrigerating effect 66% and 100% two between change.1 hot-gas bypass magnetic valve is opened, and other 2 hot-gas bypass magnetic valves turn off, the time accounting all turned off with 3 hot-gas bypass magnetic valves the chances are 30(100%-70%): 4(70%-66%).
Described high-accuracy water cold product, adopts PLC to control 3 hot-gas bypass magnetic valve actions in turn, first opens, first turn off.Not only increase the temperature stability of water cooling unit, turn improve the service life of hot-gas bypass magnetic valve.
Described high-accuracy water cold product, when the caloric value change of instrument and equipment, high-accuracy water cold is by the real-time detected temperatures change of temperature-sensing probe, and according to temperature changing trend, adopt pid parameter method, in time the refrigerating capacity of adjustment high-accuracy water cold, the caloric value change of instrument and equipment is dynamically followed the tracks of, reduce the fluctuation of cycling use of water temperature, ensure the stability of high-accuracy water cold supply water temperature.
Claims (8)
1. the present invention relates to a kind of Dynamic High-accuracy control method to compressor refrigeration system refrigerating capacity.This system mainly comprises compressor, hot-gas bypass magnetic valve, condenser, expansion valve (or capillary), evaporimeter, gas-liquid separator, temperature-sensing probe, controlled heater (cycling use of water in the water tank of water cooling unit or the tank of water-bath, or insulating box etc.) and electric control unit (temp controlled meter+wiring board or PLC) etc.It is characterized in that there is one or more hot-gas bypass magnetic valve.
2. the Dynamic High-accuracy control method of compressor refrigeration system refrigerating capacity.It is characterized in that: by compressor refrigeration system, meteyage cold-peace heats two loops.Refrigerating circuit: cold-producing medium, by the circulation of compressor high-pressure outlet → condenser → expansion valve (or capillary) → evaporimeter → gas-liquid separator → compressor low pressure gas returning port, freezes to controlled heater.Heat loop: cold-producing medium is by the circulation of compressor high-pressure outlet → hot-gas bypass magnetic valve → evaporimeter → gas-liquid separator → compressor low pressure gas returning port, high temperature and high pressure gaseous refrigerant, by hot-gas bypass magnetic valve, access evaporimeter, heats controlled heater.
3. the Dynamic High-accuracy control method of compressor refrigeration system refrigerating capacity.It is characterized in that: refrigeration compressor is ceaselessly working always, compressor refrigeration system is to the controlled heater (cycling use of water in the water tank of water cooling unit or the tank of water-bath, or insulating box etc.) freeze while, according to the caloric value of controlled heater, by one or more hot-gas bypass magnetic valve, controlled heater is heated.Make the refrigerating capacity of the caloric value of controlled heater+the heat heating capacity ≈ refrigerating circuit in loop.Reach the temperature to controlled heater, carry out the object of Dynamic High-accuracy control.
4. the Dynamic High-accuracy control method of compressor refrigeration system refrigerating capacity.It is characterized in that: hot-gas bypass magnetic valve, can be one, also can be multiple.When hot-gas bypass magnetic valve is one, compressor refrigeration system, meteyage cold-peace is not freezed two kinds of operating modes.By the latus rectum of selection hot-gas bypass magnetic valve and the latus rectum of tube connector, hot-gas bypass magnetic valve can be reached when turning off, the refrigerating capacity of refrigerating circuit is 100% of overall refrigerating effect, the heating capacity heating loop is 0% of overall refrigerating effect, and now compressor refrigeration system refrigerating capacity is 100% of overall refrigerating effect; When hot-gas bypass magnetic valve is opened, the refrigerating capacity of refrigerating circuit is 50% of overall refrigerating effect, and the heating capacity heating loop is 50% of overall refrigerating effect, and now compressor refrigeration system refrigerating capacity is 0% of overall refrigerating effect.The refrigerating capacity of compressor refrigeration system, according to the break-make of hot-gas bypass magnetic valve, in 0% and 100% point-to-point transmission change.
5. when the caloric value of controlled heater is 70% of refrigeration system overall refrigerating effect, hot-gas bypass magnetic valve, need ceaselessly to open → turn off → open → turn off, compressor refrigeration system refrigerating capacity, in 0% and 100% point-to-point transmission change of overall refrigerating effect, the chances are 30% and 70% for the magnetic valve time accounting opening and turn off, and the temperature of controlled heater can fluctuate in certain scope.
6. the Dynamic High-accuracy control method of compressor refrigeration system refrigerating capacity.It is characterized in that: hot-gas bypass magnetic valve, can be one, also can be multiple.Such as, when hot-gas bypass magnetic valve is 3, by the latus rectum of selection hot-gas bypass magnetic valve and the latus rectum of tube connector, compressor refrigeration system, can meteyage cold be overall refrigerating effect 100%, refrigerating capacity be overall refrigerating effect 66%, refrigerating capacity be overall refrigerating effect 32%, refrigerating capacity is the various working such as-2% of overall refrigerating effect.When the caloric value of controlled heater is 70% of refrigeration system overall refrigerating effect, there is a hot-gas bypass magnetic valve, need to open → turn off → open → turn off, compressor refrigeration system refrigerating capacity, overall refrigerating effect 66% and 100% two between change, the temperature of controlled heater can fluctuate in less scope.
7. the Dynamic High-accuracy control method of compressor refrigeration system refrigerating capacity.It is characterized in that: by multiple hot-gas bypass magnetic valve, to the temperature of controlled heater, when carrying out dynamic high precision control, adopt PLC to control the action in turn of multiple hot-gas bypass magnetic valves, first open, first turn off.Not only increase the temperature stability of compressor refrigeration system, turn improve the service life of hot-gas bypass magnetic valve.
8. the Dynamic High-accuracy control method of compressor refrigeration system refrigerating capacity.It is characterized in that: when the caloric value change of instrument and equipment, compressor refrigeration system, by the real-time detected temperatures change of temperature-sensing probe, and according to temperature changing trend, pid parameter is adopted to adjust the refrigerating capacity of compressor refrigeration system in time, the caloric value change of instrument and equipment is dynamically followed the tracks of, reduces the fluctuation of controlled heater temperature, ensure the stability of temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410129511.3A CN104976812A (en) | 2014-04-02 | 2014-04-02 | High precision dynamic control method for refrigerating capacity of compressor refrigeration system |
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| CN201410129511.3A CN104976812A (en) | 2014-04-02 | 2014-04-02 | High precision dynamic control method for refrigerating capacity of compressor refrigeration system |
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| CN104976812A true CN104976812A (en) | 2015-10-14 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5193353A (en) * | 1991-07-05 | 1993-03-16 | Carrier Corporation | High capacity hot gas heating system for transport refrigeration system |
| CN201074936Y (en) * | 2007-08-15 | 2008-06-18 | 阿尔西制冷工程技术（北京）有限公司 | Refrigeration system capable of controlling refrigeration output |
| CN201476392U (en) * | 2009-09-03 | 2010-05-19 | 中国电子科技集团公司第十四研究所 | Self-adaptation refrigerating capacity liquid cooling source system |
| CN201476387U (en) * | 2009-08-06 | 2010-05-19 | 深圳市大族激光科技股份有限公司 | High-precision thermostatic cooling-water machine |
| CN102305505A (en) * | 2011-07-22 | 2012-01-04 | 武汉市汉立电器有限公司 | Constant-temperature cold water unit and control method thereof |
| CN202938559U (en) * | 2012-10-31 | 2013-05-15 | 深圳市安格斯机械有限公司 | Air-cooling type cooling-water machine with high precision |
-
2014
- 2014-04-02 CN CN201410129511.3A patent/CN104976812A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5193353A (en) * | 1991-07-05 | 1993-03-16 | Carrier Corporation | High capacity hot gas heating system for transport refrigeration system |
| CN201074936Y (en) * | 2007-08-15 | 2008-06-18 | 阿尔西制冷工程技术（北京）有限公司 | Refrigeration system capable of controlling refrigeration output |
| CN201476387U (en) * | 2009-08-06 | 2010-05-19 | 深圳市大族激光科技股份有限公司 | High-precision thermostatic cooling-water machine |
| CN201476392U (en) * | 2009-09-03 | 2010-05-19 | 中国电子科技集团公司第十四研究所 | Self-adaptation refrigerating capacity liquid cooling source system |
| CN102305505A (en) * | 2011-07-22 | 2012-01-04 | 武汉市汉立电器有限公司 | Constant-temperature cold water unit and control method thereof |
| CN202938559U (en) * | 2012-10-31 | 2013-05-15 | 深圳市安格斯机械有限公司 | Air-cooling type cooling-water machine with high precision |
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Application publication date: 20151014 |