CN202432782U - Control system for industrial device with refrigerating unit - Google Patents
Control system for industrial device with refrigerating unit Download PDFInfo
- Publication number
- CN202432782U CN202432782U CN2011203931276U CN201120393127U CN202432782U CN 202432782 U CN202432782 U CN 202432782U CN 2011203931276 U CN2011203931276 U CN 2011203931276U CN 201120393127 U CN201120393127 U CN 201120393127U CN 202432782 U CN202432782 U CN 202432782U
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- refrigeration unit
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Abstract
The utility model relates to a control system for an industrial device with a refrigerating unit. The refrigerating unit is provided with sensors and electromagnetic valves. The sensors comprise a motor working current sensor, a refrigerant evaporation pressure sensor, a compressor oil level protection signal sensor, a compressor high-pressure protection signal sensor, a compressor low-pressure protection signal sensor, a power phase sequence and voltage protection signal sensor, a compressor motor overheat protection signal sensor and a compressor oil differential pressure protection signal sensor. The electromagnetic valves are arranged on a pipeline for adjusting the flow of a refrigerant flowing through the heat exchanger. The industrial device comprises a master control system. The sensors are electrically connected with interface modules of the master control system. Operational reliability is improved, purchasing, operation and maintenance cost is lowered, an aear occupied by a set of operating system is saved, and the control system is an ideal refrigerating unit control system.
Description
Technical field
The utility model relates to a kind of control system with the refrigeration unit commercial plant.
Background technology
In commercial plant; The use of refrigeration unit is very extensive; Utilize refrigeration unit can obtain to satisfy needed low temperature environment or cryogenic media in production, the scientific research process, use refrigeration unit to realize such as occasions such as low temperature absorption absorption, low-temp reaction condition great majority.The sensing of refrigeration unit and control section are very complicated; For example the refrigeration machine evaporating pressure is measured, current of electric is measured, compressor autoprotection signal and for the control signal of magnetic valve etc., must collect through the control system, computing and export the corresponding operating signal.Refrigeration unit itself carries a cover control system and realizes aforesaid operations, but often there are a lot of drawbacks in the system that carries in practical application.The one, the refrigeration unit applied environment much is oil, petrochemical industry, the chemical enterprise that explosion danger is arranged; As the refrigeration unit switch board is placed in the scene; Be difficult to solve the requirement of explosion-proof or unpacking maintenance,, can bring the trouble of occupation of land and operating aspect again as switch board being laid and the Shop floor control chamber.The 2nd, the cost problem, a cover satisfies the control system (for example PLC or industrial computer) that control requires, and adds operating desk and man-machine interface etc., and cost is very high, the increase of bringing application cost for the refrigeration unit user.
CN200820018072.9 discloses a kind of frozen products insulated container refrigeration machine controller, utilizes Programmable Logic Controller and remote controller to realize the Long-distance Control to refrigeration machine, under the specific plant environment, and owing to restriction to wireless signal, suitable this method of using.CN02218557.7 discloses the intelligence controlling device of online concentration monitor demonstration of a kind of lithium bromide refrigerator and crystallization early warning, also can't solve safety problem and cost problem in the refrigeration unit use.
Summary of the invention
To the deficiency of prior art, the utility model provides a kind of control system with the refrigeration unit commercial plant, on the basis of realizing the effective control of refrigeration unit, reduces cost.
The control system of the utility model band refrigeration unit commercial plant; Comprise following content: refrigeration unit is provided with sensor and magnetic valve; Sensor comprises motor working current sensor, cold-producing medium evaporating pressure sensor, compressor oil level guard signal sensor, compressor high voltage protective signal transducer, compressor low-voltage variation signal transducer, power phase and voltage protecting signal sensor, compressor motor overheating guard signal sensor, compressor oil differential pressure guard signal sensor, and magnetic valve is arranged on to be regulated on the heat exchanger refrigerant flow pipeline of flowing through; Commercial plant comprises master control system, and the sensor is connected with electric connection mode with the interface module of master control system.Refrigeration unit self does not contain the control system.
In the utility model; The motor working current sensor is positioned at the refrigeration unit junction box; Integrated electric current mutual inductance transmitter of each socket on the three phase supply cable, the alternating current when refrigeration unit is worked converts the 4-20mA standard signal into, delivers to and carries out monitoring, alarming in the master control system.
In the utility model, cold-producing medium evaporating pressure sensor is positioned at the cold side outlet of refrigeration unit heat exchanger, converts the pressure signal after the cold-producing medium heat exchange into the 4-20mA standard signal, delivers in the master control system and monitors, controls, reports to the police.
In the utility model, the temperature switch that each guard signal is carried by refrigeration unit, pressure controller, differential pressure controller, power phase and voltage protector etc. send, and this type of signal is delivered to as digital quantity signal and carried out monitoring, alarming in the master control system.
In the utility model; The master control system of the main commercial plant at refrigeration unit place comprises functions such as data acquisition, I/O processing, logic control, interlocking action; Can realize the control and the monitoring of whole process of production, and function such as data management, printing, warning.Master control system is that refrigeration unit is reserved essential interface module, comprises analog quantity input module, digital quantity input module, digital quantity output module etc.
When operate as normal, master control system opens or closes magnetic valve according to the evaporating pressure of refrigeration unit, and the refrigerant amount of refrigeration unit is flow through in control, changes the cold junction temperature of heat exchanger, thereby changes by the temperature of refrigerant.
Under improper situation, master control system receives the fault-signal that is sent by unit, is presented at man-machine interface and sends alarm signal, makes actions such as off-load, emergency shutdown or manual intervention shutdown automatically, to guarantee device itself and operating personnel's safety.
Other content of the utility model is a content well known to those skilled in the art like control method of refrigeration unit etc.
The utlity model has following advantage: the utility model can reduce by a cover refrigeration machine set control system, when cost reduces, and also corresponding trouble point of reducing package unit, thus reduced the cost of operation, maintenance and maintenance.Simultaneously; Because master control system is positioned at the operating room of comparatively safe and ambient stable, compares and in working site or operating room, sets up one to overlap independently refrigeration machine operating system, master control system is more reliable; Take up an area of still less, improved the promptness and the accuracy of operate as normal and troubleshooting.
Description of drawings
Fig. 1 is the control scheme schematic diagram of the utility model.
Wherein: 1, the medium inlet that is cooled; 2, the media outlet that is cooled; 3, heat exchanger; 4, cold-producing medium evaporating pressure sensor; 5, magnetic valve V1; 6, magnetic valve V3; 7, motor working current sensor; 8, compressor; 9, refrigeration unit guard signal; 10, magnetic valve V2; 11, filter; 12, cold-producing medium surge tank; 13, cold-producing medium adds the inlet valve; 14, cold-producing medium adds inlet; 15, master control system.
Fig. 2 is the refrigeration unit partial logic block diagram of master control system.
The specific embodiment
In the utility model, receive the transducing signal of refrigeration unit,,, control the control scheme of refrigeration unit operation to refrigeration unit output control signal through after the logical process by the master control system of commercial plant.With the control system of refrigeration unit and become owner of commercial plant control system; Refrigeration unit only is responsible for output transducing signal and operation command; And carry out remote logic processing and operational order output by master control system; When solving refrigeration unit control, reduced cost, improved stability.
Below in conjunction with Fig. 1, Fig. 2 the technical scheme of the utility model is done further elaboration.
As shown in Figure 1, the medium that is cooled gets into from the medium inlet 1 that is cooled, and with cold-producing medium heat exchange in heat exchanger 3, leaves refrigeration unit from the media outlet 2 that is cooled then.Cold-producing medium is stored in the surge tank 12, in refrigeration unit, recycles, and is lossless under the normal condition.After the unit pipeline has trace to reveal to cause using a period of time, during lack of refrigerant, open cold-producing medium and add inlet valve 13, add inlet 14 through cold-producing medium and replenish an amount of cold-producing mediums.
When refrigeration unit is started shooting, send the magnetic valve work order in conjunction with Fig. 2 by master control system.Regulate the throughflow of cold-producing medium with the difference of magnetic valve place pipeline caliber.Be the protection motor, being set to segmentation increases power.At first magnetic valve V1 is closed, magnetic valve V2 opens, and magnetic valve V3 opens; With 25% power operation a period of time, then magnetic valve V1 is opened, magnetic valve V2 closes; Magnetic valve V3 opens, and with 50% power operation a period of time, at last magnetic valve V1 is opened; Magnetic valve V2 closes, and magnetic valve V3 closes, and refrigeration machine normally moves with 100% power.
In the course of work, cold-producing medium evaporating pressure sensor 4 characterizes the running status of refrigeration machine.Work as hypertonia, represent refrigeration machine output cold less than normal, need load, V1 opens with magnetic valve, and magnetic valve V2 closes, and magnetic valve V3 closes until pressure normal; Work as hypotony, represent refrigeration machine output cold bigger than normal, need carry out off-load, V1 opens with magnetic valve, and magnetic valve V2 closes, and magnetic valve V3 opens until pressure normal.When operate as normal, V1 opens with magnetic valve, and magnetic valve V2 opens, and magnetic valve V3 closes.
When unusual generation, refrigeration unit guard signal 9 sensors output different protection signal, master control system is made actions such as off-load, emergency shutdown or manual intervention shutdown automatically.
When the refrigeration unit manual shut-down, stopping process and start process are opposite, i.e. segmentation reduces power until shutdown.
Claims (7)
1. control system with the refrigeration unit commercial plant; It is characterized in that comprising following content: refrigeration unit is provided with sensor and magnetic valve; Sensor comprises motor working current sensor, cold-producing medium evaporating pressure sensor, compressor oil level guard signal sensor, compressor high voltage protective signal transducer, compressor low-voltage variation signal transducer, power phase and voltage protecting signal sensor, compressor motor overheating guard signal sensor, compressor oil differential pressure guard signal sensor, and magnetic valve is arranged on to be regulated on the heat exchanger refrigerant flow pipeline of flowing through; Commercial plant comprises master control system, and the sensor is connected with electric connection mode with the interface module of master control system.
2. according to the described system of claim 1; It is characterized in that: the motor working current sensor is positioned at the refrigeration unit junction box; Integrated electric current mutual inductance transmitter of each socket on the three phase supply cable; Alternating current when refrigeration unit is worked converts the 4-20mA standard signal into, delivers to and carries out monitoring, alarming in the master control system.
3. according to the described system of claim 1; It is characterized in that: cold-producing medium evaporating pressure sensor is positioned at the cold side outlet of refrigeration unit heat exchanger; Convert the pressure signal after the cold-producing medium heat exchange into the 4-20mA standard signal, deliver in the master control system and monitor, control, report to the police.
4. according to the described system of claim 1; It is characterized in that: the temperature switch that each guard signal is carried by refrigeration unit, pressure controller, differential pressure controller, power phase and voltage protector send, and this type of signal is delivered to as digital quantity signal and carried out monitoring, alarming in the master control system.
5. according to the described system of claim 1, it is characterized in that: the master control system of the main commercial plant at refrigeration unit place contains the interface module that promising refrigeration unit is reserved, and comprises analog quantity input module, digital quantity input module, digital quantity output module.
6. according to the described system of claim 1; It is characterized in that: master control system opens or closes magnetic valve according to the evaporating pressure of refrigeration unit; The refrigerant amount of refrigeration unit is flow through in control, changes the cold junction temperature of heat exchanger, thereby changes by the temperature of refrigerant.
7. according to the described system of claim 1; It is characterized in that: under improper situation; Master control system receives the fault-signal that is sent by unit; Be presented at man-machine interface and send alarm signal, make off-load, emergency shutdown or manual intervention automatically and shut down action, to guarantee device itself and operating personnel's safety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203931276U CN202432782U (en) | 2011-10-17 | 2011-10-17 | Control system for industrial device with refrigerating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203931276U CN202432782U (en) | 2011-10-17 | 2011-10-17 | Control system for industrial device with refrigerating unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202432782U true CN202432782U (en) | 2012-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203931276U Expired - Lifetime CN202432782U (en) | 2011-10-17 | 2011-10-17 | Control system for industrial device with refrigerating unit |
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| Country | Link |
|---|---|
| CN (1) | CN202432782U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103029551A (en) * | 2012-10-10 | 2013-04-10 | 合肥天鹅制冷科技有限公司 | Automatic control device for water path refrigerated transportation |
| CN105431693A (en) * | 2013-08-01 | 2016-03-23 | 开利公司 | Refrigerant level monitor for refrigeration system |
| CN109352860A (en) * | 2018-09-29 | 2019-02-19 | 嘉兴固特塑料制品有限公司 | Polytetrafluoroethylene (PTFE) processes cooling means |
-
2011
- 2011-10-17 CN CN2011203931276U patent/CN202432782U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103029551A (en) * | 2012-10-10 | 2013-04-10 | 合肥天鹅制冷科技有限公司 | Automatic control device for water path refrigerated transportation |
| CN105431693A (en) * | 2013-08-01 | 2016-03-23 | 开利公司 | Refrigerant level monitor for refrigeration system |
| US10228172B2 (en) | 2013-08-01 | 2019-03-12 | Carrier Corporation | Refrigerant level monitor for refrigeration system |
| CN105431693B (en) * | 2013-08-01 | 2021-08-24 | 开利公司 | Refrigerant level monitoring for refrigeration systems |
| CN109352860A (en) * | 2018-09-29 | 2019-02-19 | 嘉兴固特塑料制品有限公司 | Polytetrafluoroethylene (PTFE) processes cooling means |
| CN109352860B (en) * | 2018-09-29 | 2021-01-05 | 嘉兴固特塑料制品有限公司 | Cooling method for processing polytetrafluoroethylene |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120912 |
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| CX01 | Expiry of patent term |