CN210769319U - Waste heat expansion power recovery type oil injection screw compressor control system - Google Patents
Waste heat expansion power recovery type oil injection screw compressor control system Download PDFInfo
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- CN210769319U CN210769319U CN201921204572.6U CN201921204572U CN210769319U CN 210769319 U CN210769319 U CN 210769319U CN 201921204572 U CN201921204572 U CN 201921204572U CN 210769319 U CN210769319 U CN 210769319U
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Abstract
The waste heat expansion power recovery type oil injection screw compressor control system has high automation degree and good cooling effect, can realize real-time monitoring of each cooling device, can realize automatic shutoff of the compressor, the device comprises a CPU controller U1, wherein the CPU controller U1 is connected with a power module, the power module comprises a compressor main motor, a working medium pump, a condensing fan and an expander oil pump, the working medium pump is used for driving working media of a working medium liquid storage tank to flow, the compressor main motor is used for driving a compressor, the device is characterized by further comprising a detection module, wherein the detection module comprises a pressure transmitter, a liquid level remote transmitter, a flow remote transmitter and a temperature sensor, the pressure transmitter, the liquid level remote transmitter and the temperature sensor are arranged in the compressor, the working medium liquid storage tank, the evaporator and the expander, and the flow remote transmitter is arranged at the outlet ends of the compressor, the working medium liquid storage tank, the evaporator and the expander.
Description
Technical Field
The utility model relates to an oil spout screw compressor technical field specifically is an exhaust heat expansion power recovery type oil spout screw compressor control system.
Background
The oil injection screw compressor lubricates and cools a high-speed rotor through the lubricating and cooling effects of oil, the oil and compressed gas in the traditional oil injection screw compressor are cooled through a fan or water, the cooling effect is poor, and the wind energy generated by the fan is not easy to recycle, so that unnecessary energy waste is caused Pressure gauge, the start-stop operation of the registration control compressor of each check out test set such as flowmeter, the mode of people's eye observation easily receives subjective initiative influence, the mistake reading appears or start-stop operation is untimely, lead to the problem that the compressor can't in time turn-off, thereby easily lead to the problem that production facility operating temperature surpassed the rated value and damaged to appear, and be used for oil content and high temperature high-pressure gas cooling back in the compressor of compressor refrigerated working medium pair that exists among the prior art, directly discharge to the external world, thereby caused unnecessary wasting of resources.
SUMMERY OF THE UTILITY MODEL
The structure of waste heat expansion power recovery type oil spout screw compressor control system to existence among the prior art is complicated, and degree of automation is lower, and the people observes opening of reading control compressor of each check out test set such as thermometer, pressure gauge, flowmeter and stops the operation, easily appears the mistake reading or open and stop the operation untimely, leads to the problem that the compressor can't in time turn-off to and energy consumption is big, the problem of easy extravagant resource, the utility model provides a waste heat expansion power recovery type oil spout screw compressor control system, its degree of automation is high, and cooling effect is good, can realize each cooling arrangement's real-time supervision, can reduce energy consumption, resources are saved.
A waste heat expansion power recovery type oil injection screw compressor control system comprises a CPU controller U1, the CPU controller U1 is connected with a power module, the power module comprises a compressor main motor, a working medium pump, a condensing fan and an expander oil pump, the working medium pump is used for driving the working medium of the working medium liquid storage tank to flow, the main motor of the compressor is used for driving the compressor, the oil pump of the expander is used for lubricating the bearing of the expander, it is characterized by also comprising a detection module, wherein the detection module comprises a pressure transmitter, a liquid level remote transmitter, a flow remote transmitter and a temperature sensor, the pressure transmitter, the liquid level remote transmitter and the temperature sensor are arranged in the compressor, the working medium liquid storage tank, the evaporator and the expander, and the flow remote transmission transmitter is arranged at the outlet ends of the compressor, the working medium liquid storage tank, the evaporator and the expander.
The system is further characterized in that the pressure transmitter, the liquid level remote transmitter, the flow remote transmitter and the temperature sensor are respectively connected with the input end of the CPU controller U1 through analog input modules, the working medium pump is connected with the output end of the CPU controller U1 through sequentially connected frequency converters, and the output end of the CPU controller U1 is also respectively connected with the condensing fan, the expander oil pump, the compressor main motor, the evaporator, the bypass valve and the air inlet controller;
the CPU controller U1 is S7-1200, the CPU controller U1 includes AD conversion module, PID adjustment module;
the working medium in the working medium liquid storage tank is a refrigerant, and the refrigerant is pentafluoropropane R245 fa;
the gas output port of the working medium liquid storage tank is sequentially connected with an evaporator, an expander and a condenser through pipelines, the output end of the condenser is connected with the input end of the working medium liquid storage tank, a bypass valve is arranged on the pipeline between the evaporator and the expander, an oil path and a gas path pipeline of the compressor penetrate through the evaporator, the evaporator is used for cooling oil in the oil path and the gas path pipeline and high-temperature and high-pressure gas compressed by the compressor, and the temperature sensors are arranged on the oil path and the gas path pipeline.
The control system is applied to a cooling system of an oil injection screw compressor, pressure transmitters, liquid level remote transmitters and temperature sensors are respectively arranged in a compressor, a working medium liquid storage tank, an evaporator and an expander, flow remote transmitters are respectively arranged at the outlet end and the inlet end of the compressor, the working medium liquid storage tank, the evaporator and the expander, gas pressure, liquid level and temperature information in the compressor, the working medium liquid storage tank, the evaporator and the expander are respectively detected and collected in real time through the pressure transmitters, the liquid level remote transmitters and the temperature sensors, flow information at the outlet end and the inlet end of the compressor, the working medium liquid storage tank, the evaporator and the expander is detected and collected in real time through the flow remote transmitters, and the pressure transmitters, the liquid level remote transmitters, the temperature sensors and the flow remote transmitters transmit the collected gas pressure, liquid level remote transmitters, flow remote transmitters and gas pressure, The liquid level, temperature and flow information are transmitted to a CPU controller U1, the CPU controller U1 controls the start and stop operation of a main motor of the compressor, a working medium pump and an expander oil pump respectively according to the information, so that the effect of monitoring each device in real time is achieved, meanwhile, the liquid level in the evaporator is controlled through the CPU controller U1, the liquid level is stabilized at a set value, the working medium guided in a working medium pump liquid storage tank can be ensured to automatically cool oil content and compressed gas in the compressor, the oil content and the compressed gas temperature of the compressor are ensured to be controlled in a reasonable range, and the automation degree of the system is greatly improved; after the working medium of the working medium liquid storage tank in the system is evaporated by the evaporator, the working medium can automatically return to the liquid storage tank by being condensed by the condenser under the action of the expansion force of the expansion machine, so that the working medium can be repeatedly utilized, and the waste of resources is avoided; the detection of gas pressure, liquid level, temperature and liquid level in this system is realized through installing pressure transmitter, liquid level teletransmission changer, temperature sensor, flow teletransmission changer respectively in each equipment, when detecting the information in certain equipment and surpassing the setting value, accessible CPU controller U1 automatic cutout compressor, and it need not the people's eye and observes each reading, has avoided the problem that the compressor that the mistake reading or start-stop operation untimely leads to can't in time turn off to appear.
Drawings
Fig. 1 is a block diagram of the system structure of the present invention;
fig. 2 is an electrical schematic diagram of a power module in the control system of the present invention;
fig. 3 is an electrical schematic diagram of a detection module in the control system of the present invention;
FIG. 4 is a block diagram of the gas circuit system of the present invention;
FIG. 5 is a control flow chart of steps S1-S3 for controlling the cooling system of the oil-injected screw compressor by using the control system of the present invention;
FIG. 6 is a control flow chart of steps S4-S6 for controlling the cooling system of the oil-injected screw compressor by using the control system of the present invention.
Detailed Description
Referring to fig. 1, 2, 3 and 4, a waste heat expansion power recovery type oil injection screw compressor control system comprises a CPU controller U1, the CPU controller U1 is connected with a power module, the power module comprises a compressor main motor 11, a working medium pump 21, a condensing fan 31 and an expander oil pump 51, an air inlet controller 72 is arranged at an air inlet pipeline of a compressor 1, the working medium pump 21 is used for driving working medium of a working medium storage tank 2 to flow, the compressor main motor 11 is used for driving the compressor 1, the condensing fan 31 is used for driving a condenser 3, the expander oil pump 51 is used for driving an expander 5, and the waste heat expansion power recovery type oil injection screw compressor control system further comprises a detection module, the detection module comprises a pressure transmitter 6, a liquid level remote transmission transmitter 7, a flow remote transmission transmitter 8 and a temperature sensor 9, the pressure transmitter 6, the liquid level remote transmission transmitter 7 and the liquid level remote transmission transmitter 7 are arranged inside the compressor 1, The temperature sensor 9, the pressure transmitter 6, the liquid level remote transmitter 7, the flow remote transmitter 8 and the temperature sensor 9 can all adopt the existing detection equipment, the flow remote transmitter 8 is installed at the outlet ends of the compressor 1, the working medium liquid storage tank 2, the evaporator 4 and the expander 5, the pressure transmitter 6, the liquid level remote transmitter 7, the flow remote transmitter 8 and the temperature sensor 9 are respectively connected with the input end of a CPU controller U1 through an analog input module 10, the working medium pump 21 is connected with the output end of the CPU controller U1 through a sequentially connected frequency converter 12, and the output end of the CPU controller U1 is respectively connected with the condensing fan 31, the evaporator 4, the expander oil pump 51, the compressor main motor 11, the bypass valve 23 and the air inlet controller 72 through a relay; the CPU controller U1 is S7-1200, the CPU controller U1 includes AD conversion module 13, PID adjusting module 14, the working medium in the working medium liquid storage tank 2 is refrigerant, the refrigerant is R245 fa;
the gas output port of the working medium liquid storage tank 2 is sequentially connected with an evaporator 4, an expander 5 and a condenser 3 through a pipeline 22, the output end of the condenser 3 is connected with the input end of the working medium liquid storage tank 2, a bypass valve 23 is arranged on the pipeline 22 between the evaporator 4 and the expander 5, an oil path and a gas path pipeline 15 of the compressor 1 penetrate through the evaporator 4, and the evaporator 4 is used for cooling lubricating oil in the oil path and the gas path pipeline 15 and high-temperature high-pressure gas compressed by the compressor.
Referring to fig. 4 and 5, fig. 4 is a schematic diagram of an interface between the CPU controller U1 and each device, in which a pressure 1 signal input is a pressure signal in the evaporator 4 detected by the pressure transmitter 6, a pressure 2 signal input is a pressure signal in the expander 5 detected by the pressure transmitter 6, a pressure 3 signal input is a pressure signal in the condenser 3 detected by the pressure transmitter 6, a pressure 4 signal input is a pressure signal in the working medium 2 in the liquid storage tank detected by the pressure transmitter 6, a pressure 5 signal input is a signal input in the compressor 1 detected by the pressure transmitter 6, an evaporator liquid level signal input is a liquid level in the evaporator 4 detected by the liquid level remote transmitter 7, a condenser liquid level signal input is a liquid level signal in the condenser 3 detected by the liquid level remote transmitter 7, a flow 1 signal input is a flow signal at an output port of the working medium storage tank 2 detected by the flow remote transmitter 8, the flow 2 signal input is flow information in an oil path of the compressor and an air path pipeline 15 detected by a flow remote transmitter 8, the flow 3 signal input is flow information in a pipeline between the condenser 3 and the working medium liquid storage tank 2 detected by the flow remote transmitter 8, the temperature 1 signal input is a temperature signal in the evaporator 4 detected by a temperature sensor 9, the temperature 2 signal input is a pressure signal in the expander 5 detected by the temperature sensor 9, the temperature 3 signal input is a pressure signal in the condenser 3 detected by the temperature sensor 9, the temperature 4 signal input is a pressure signal in the working medium liquid storage tank 2 detected by the temperature sensor 9, and the pressure 5 signal input is a temperature signal in the oil path of the compressor 1 and the air path pipeline 15 detected by the temperature sensor 9; the AD conversion module and the PID adjusting module in this embodiment may respectively adopt an AD converter and a PID adjuster in the prior art, the AD conversion module is used to convert the acquired analog signal into a digital signal, and the PID adjusting module is an automatic controller and may be used to automatically adjust and control the frequency of the working medium pump.
Referring to fig. 5 and 6, a method for realizing the liquid level of an evaporator in a waste heat expansion power recovery type oil-injection screw compressor control system by adopting the system specifically comprises the following steps: it is characterized in that the preparation method is characterized in that,
s0, resetting the system and detecting whether the system has parameters in an alarm state;
s1, the system is powered on and started, the expander oil pump 51 is controlled to be started through the CPU controller U1, a pressure regulating valve on one side of the expander is manually regulated, the oil pressure of the expander oil pump 51 is established to be 0.4MPa, the expander oil pump 51 is shut down, the working medium pump 11 is started until the liquid level in the evaporator 4 is 300mm, and the working medium pump 11 is shut down;
s2, the CPU controller U1 controls the start of the compressor main motor 11, the condenser fan 31, and the expander oil pump 51, respectively, to start the compressor 1 and the condenser 3Expander 5；
S3, detecting the gas pressure, liquid level and temperature conditions in the compressor 1, the condenser 3 and the evaporator 4 respectively through the pressure transmitter 6, the liquid level remote transmitter 7 and the temperature sensor 9, detecting the flow information in the pipeline through the flow remote transmitter 8, and transmitting the information to the CPU controller U1;
s4, the CPU controller U1 establishes the evaporation condition according to the information provided in the step S3, which includes the following conditions:
s41, determining whether the liquid level in the evaporator 3 is stable at a set value, wherein the set value is preset in a data processing module in the CPU controller U1, and the data processing module determines whether the liquid level in the evaporator 4 is stable at the set value, specifically: s411, when the liquid level in the evaporator 4 is stabilized at the set value, the CPU controller U1 controls the bypass valve 23 to open, and the process goes to step S5 to introduce the high-pressure gas into the expander 5; s412, when the liquid level in the evaporator 3 is lower than the set value, the CPU controller U1 controls the working medium pump 21 to start, and the working medium pump is started through the controlPID adjusting module in CPU controller U1 automatically adjusts frequency of working medium pumpWhen the liquid level in the evaporator 3 is stabilized at the set value, the CPU controller U1 controls the bypass valve 23 to open, and then the process proceeds to step S5 to introduce the high-pressure gas into the expander 5; s413, when the liquid level in the evaporator 3 is higher than a set value (used in the figure), the CPU controller U1 controls the working medium pump 21 to stop, then the frequency of the working medium pump 21 is adjusted through an adjusting button of the PID adjusting module 14, so that the liquid level in the evaporator 3 is stabilized at the set value, the CPU controller U1 controls the bypass valve 23 to open, and then the step S5 is carried out, and high-pressure gas is introduced into the expansion machine 5;
s42, judging whether the oil temperature in the oil and gas pipeline 15 is higher than a set value or not, wherein the set value is preset in a data processing module in a CPU controller U1, judging whether the oil temperature in the oil and gas pipeline 15 is higher than the set value or not through the data processing module, S421, when the oil temperature in the oil and gas pipeline 15 is stabilized at the set value, controlling a bypass valve 23 to be opened by the CPU controller U1, and entering the step S5 to introduce high-pressure gas into the expansion machine 4; s422, when the oil temperature of the oil and gas pipeline 15 is higher than a set value, the CPU controller U1 controls the bypass valve 23 to close, the frequency of the working medium pump 21 is adjusted through an adjusting button on the PID adjusting module 14, so that the liquid level in the evaporator 4 is stabilized at the set value, and then the step S5 is carried out, the CPU controller U1 controls the bypass valve 23 to open, and high-pressure gas is introduced into the expansion machine 5;
s6, when the load of the working medium pump 21 reaches a limit value, namely the evaporation working condition in the evaporator 4 is adjusted through the steps S1-S4, so that the liquid level of the evaporator 4, the temperature of the oil path and the temperature of the gas path pipeline 15 are stabilized within a preset normal range, the loading of the whole unit is completed, and through the steps S1-S6, the temperatures of the lubricating oil temperature and the compressed gas of the liquid level in the evaporator 4, the oil path and the gas path pipeline 15 are stabilized within a reasonable range, so that the cooling of the oil-injected screw compressor is realized, and the oil-injected screw compressor can normally work.
The system utilizes a special working medium refrigerant R245fa to absorb heat of oil and compressed gas in an oil injection screw compressor in an evaporator 4, so that the purpose of cooling the oil and the compressed gas can be achieved, and the high-temperature and high-pressure working medium 20 after the working medium 20 absorbs heat and evaporates can push an expander to do work, namely the whole system goes through the steps S1-S6, so that after the whole unit is loaded, when the pressure of the working medium gas in the evaporator is stabilized at a set value, an oil pump of the expander can be stopped, the working medium evaporates, and the expander is pushed to do work, therefore, no external force is needed to be applied to the expander, and the high-pressure gas after the working medium 20 in a working medium liquid storage tank 2 is gasified by the evaporator 4 automatically enters the working medium liquid storage tank 2 through a condenser 3 under the; the driving shaft of the compressor in the device is connected with the expander through the belt transmission system, the expansion force generated by the expander can drive the belt transmission system to drive the driving shaft of the compressor to rotate, namely the compressor can be driven by the main motor of the compressor, and can run through the driving action of the expander when the expander is pushed by a high-temperature and high-pressure working medium to do work, and other power is not required to be applied to the compressor, so that the energy can be greatly saved.
Claims (5)
1. The waste heat expansion power recovery type oil injection screw compressor control system is characterized by further comprising a detection module, wherein the detection module comprises a pressure transmitter, a liquid level remote transmission transmitter, a flow remote transmission transmitter and a temperature sensor, the pressure transmitter, the liquid level remote transmission transmitter and the temperature sensor are mounted inside the compressor, the working medium liquid storage tank, the evaporator and the expander, and the flow remote transmission transmitter is mounted at the outlet ends of the compressor, the working medium liquid storage tank, the evaporator and the expander.
2. The waste heat expansion power recovery type oil injection screw compressor control system is characterized in that the pressure transmitter, the liquid level remote transmission transmitter, the flow remote transmission transmitter and the temperature sensor are respectively connected with the input end of the CPU controller U1 through analog quantity input modules, the working medium pump is connected with the output end of the CPU controller U1 through sequentially connected frequency converters, and the output end of the CPU controller U1 is further respectively connected with the condensing fan, the evaporator, the expander oil pump, the compressor main motor, the bypass valve and the air inlet controller.
3. The waste heat expansion power recovery type oil injection screw compressor control system as claimed in claim 2, wherein the model number of the CPU controller U1 is S7-1200, and the CPU controller U1 comprises an AD conversion module and a PID regulation module.
4. The waste heat expansion power recovery type oil injection screw compressor control system as claimed in claim 3, wherein the working medium in the working medium storage tank is a refrigerant, and the refrigerant is pentafluoropropane R245 fa.
5. The waste heat expansion power recovery type oil injection screw compressor control system according to claim 4, wherein a gas output port of the working medium liquid storage tank is sequentially connected with an evaporator, an expander and a condenser through a pipeline, an output end of the condenser is connected with an input end of the working medium liquid storage tank, a bypass valve is arranged on the pipeline between the evaporator and the expander, an oil path and an air path pipeline of the compressor penetrate through the evaporator, and the temperature sensors are mounted on the oil path and the air path pipeline.
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| CN201921204572.6U CN210769319U (en) | 2019-07-29 | 2019-07-29 | Waste heat expansion power recovery type oil injection screw compressor control system |
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| CN201921204572.6U CN210769319U (en) | 2019-07-29 | 2019-07-29 | Waste heat expansion power recovery type oil injection screw compressor control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500279A (en) * | 2019-07-29 | 2019-11-26 | 无锡锡压压缩机有限公司 | Waste Heat Recovery type fuel injection helical lobe compressor control system and its control method |
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2019
- 2019-07-29 CN CN201921204572.6U patent/CN210769319U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500279A (en) * | 2019-07-29 | 2019-11-26 | 无锡锡压压缩机有限公司 | Waste Heat Recovery type fuel injection helical lobe compressor control system and its control method |
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