CN101498298B - Apparatus and method for measuring small-sized cold compressor oil circulation amount - Google Patents
Apparatus and method for measuring small-sized cold compressor oil circulation amount Download PDFInfo
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- CN101498298B CN101498298B CN200910095907XA CN200910095907A CN101498298B CN 101498298 B CN101498298 B CN 101498298B CN 200910095907X A CN200910095907X A CN 200910095907XA CN 200910095907 A CN200910095907 A CN 200910095907A CN 101498298 B CN101498298 B CN 101498298B
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Abstract
The invention relates to a device and a method for measuring the oil circulating load of a small-sized refrigeration compressor. The device replaces a refrigeration subsystem to adopt a two-stage heating oil separating structure. In a refrigerating and operating unit, an exhaust hole and an inhalation hole of a measured compressor are respectively sequentially connected with an exhaust oil content inlet valve, an exhaust oil and gas separator, a condenser pipe, an exhaust oil content outlet valve, an expansion valve, an inhalation oil content inlet valve, an evaporating pipe, an inhalation oil and gas separator and an inhalation oil content outlet valve through an exhaust interface and an inhalation interface to form a loop, exhaust bypass valves are connected with both ends of the exhaust oil content inlet valve and the exhaust oil content outlet valve in parallel, inhalation bypass valves are connected with both ends of the inhalation oil content inlet valve and the inhalation oil content outlet valve in parallel, and balanced valves are connected with both ends of the exhaust interface and the inhalation interface. The device and the method carry out two-stage heating oil separation for the refrigerating loop by mainly using a method that the compressor is operated in a continuous and discontinuous circulation stopping and starting mode under a variable working condition state.
Description
Technical field
The present invention relates to a kind of technical field of testing small-sized cold compressor oil circulation amount, relate to a kind of apparatus and method of measuring refrigeration system oil circulating load in particular.
Background technique
The locking system that refrigeration system is made up of compressor, condenser, vaporizer, throttle valve and other supplementary equipment.During compressor operating, there is a large amount of frictions its inside, for guaranteeing the compressor reliable operation and improve the performance of compressor that lubricated is an important link.The lubrication system of compressor has sealing, cooling, corrosion protection and antirust effect, and the quality of its performance is restricting the performance quality of refrigeration system.Because the restriction of processing technique, mini-type refrigeration compressor still adopts liquid lubrication.Therefore, when refrigeration cycle was carried out, refrigeration agent will contact with lubricant oil, and refrigeration agent and lubricant oil have and mixes.Because refrigeration agent circulates in refrigeration system, always some can flow into condenser along with the exhaust of compressor and in refrigeration system, circulate the lubricant oil in the compressor.Even if installed in the refrigeration cycle of oil separator, also have the lubricant oil that sub-fraction discharges and to get into refrigeration systems by various clearance channel again from exhaust cavity, the next circulation of beginning.The circulation of lubricant oil both can have influence on the service behaviour of refrigeration system, and the oily circulating load that flows into refrigeration cycle also is a major criterion of compressor lubrication and sealability evaluation.Therefore, the mensuration of oily circulating load is very crucial for the evaluation of compressor performance.
Many scholars after deliberation the influence of lubricant oil for compressor performance, but be based on theoretical research mostly.Present compressor manufacturing merchant, lubricant oil supplier and the Sealing MANUFACTURER empirical correlation that also mainly relies on forefathers to stay for this technical order of fuel delivery of compressor.But these empirical correlations lack enough data supports.Traditional survey oil mode complicated operation and accurate inadequately.Still lack at present the degree of accuracy height and easy to operate oily circulating load test method and testing apparatus.
Summary of the invention
The technical issues that need to address of the present invention are: provide a kind of small-sized cold compressor oil circulation amount to estimate device and utilize this measuring device to carry out the method that oily circulating load is measured; Through quantizing the oily circulating load that experiment records compressor; Estimate lubricating and sealability of tested compressor according to the result, as estimating a good and bad standard of compressor performance.
For solving the problems of the technologies described above; The present invention adopts following technological scheme: a kind of device of measuring small-sized cold compressor oil circulation amount; Comprise make compressor operating under the specific operation condition alternative refrigeration subsystem and carry out the communication subsystem of working condition control and the measurement of oily circulating load to substituting refrigeration subsystem; Alternative refrigeration subsystem comprises refrigerating operaton unit, refrigerant feeding unit and vacuum unit; Said refrigerant feeding unit is equipped with refrigerant cylinder; Said vacuum unit is equipped with vacuum pump, it is characterized in that: substitute refrigeration subsystem and adopt two-stage heated oils separation structure, the tested compressor relief opening of wherein said refrigerating operaton unit and intakeport divide outlet valve, expansion valve, air-breathing oil content inlet valve, evaporating pipe, air-breathing deaerator, air-breathing oil content outlet valve to be in turn connected into a loop through exhaust port, air-breathing interface and vent control valve subentry valve, vent control valve gas separating device, condensation tube, vent control valve respectively; Exhaust by-pass valve is connected in parallel on vent control valve subentry valve and vent control valve divides the outlet valve two ends; Air-breathing bypass valve is connected in parallel on air-breathing oil content inlet valve and air-breathing oil content outlet valve two ends, and equilibrium valve is connected in parallel on exhaust port and air-breathing interface two ends, said specific operation condition: 55 ± 4 ℃ of condensing temperatures; Evaporating temperature-23.3 ± 3 ℃; 32 ± 2 ℃ of suction temperatures, 60 ± 2 ℃ of oil content ambient temperatures, 22 ± 5 ℃ of compressor Environmental Conditions temperature.
Said evaporating pipe and condensation tube place oil content indoor; The indoor electric heating tube one and circulating fan one of being furnished with its ambient temperature of adjusting of oil content; Drawing fan is equipped with at the evaporating pipe place, and the suction temperature of refrigerating operaton unit is regulated through the control drawing fan, and tested compressor is placed in the environmental chamber; Be furnished with the electric heating tube two and circulating fan two that are used to regulate compressor ambient temperature in the environmental chamber; Said expansion valve also links to each other with the stepper motor of its opening degree of control, controls evaporating temperature through the opening degree of this stepper motor variable expansion valve, and the condensing temperature of refrigerating operaton unit is regulated by the adding quantity of refrigeration agent.
A kind of said apparatus that utilizes carries out the method that oily circulating load is measured, and it is characterized in that carrying out according to the following steps oil and separates:
1) preheating step: compressor and starting; Close equilibrium valve; Pass vent control valve subentry valve, vent control valve divide outlet valve, air-breathing oil content inlet valve, air-breathing oil content outlet valve; Begin to rehearse gas bypass valve, air-breathing bypass valve, control substitute refrigeration subsystem and reach certain operating mode, and the ambient temperature of oil content chamber is transferred to 50～70 ℃; Preheat time, T1 was 60～120 minutes;
2) continuous operating procedure: compressor and starting, close equilibrium valve, close exhaust by-pass valve, air-breathing bypass valve, the gas and oil subentry valve that begins to rehearse, vent control valve divide outlet valve, air-breathing oil content inlet valve, air-breathing oil content outlet valve; Continuous operating time T2 is 2～4 hours;
3) discontinuous cycle is stopped operating procedure: be divided into compressor and open and close two steps; Opening step; Compressor opening, equilibrium valve closes, and closes exhaust by-pass valve, air-breathing bypass valve; Begin to rehearse gas and oil subentry valve, vent control valve divides outlet valve, air-breathing oil content inlet valve, air-breathing oil content outlet valve, and running time T 5 is 10～20 minutes; Closing step; Compression office, equilibrium valve leaves, and closes exhaust by-pass valve, air-breathing bypass valve; Begin to rehearse gas and oil subentry valve, vent control valve divides outlet valve, air-breathing oil content inlet valve, air-breathing oil content outlet valve; Running time T 6 is 10～20 minutes, and the summation of time T 5 and T6 is an operation period T4, and it is 10～15 cycles that discontinuous cycle is stopped the operating procedure time.
4) step of weighing: after operating procedure and discontinuous cycle are stopped operating procedure continuously, from air-breathing deaerator and vent control valve gas separating device, get oil through graduated cylinder respectively, two step oil mass summations are oily circulating load.
The present invention compared with prior art has following beneficial effect:
Measuring device of the present invention mainly is under the variable working condition state, to stop mode with continuous and discontinuous circulation through compressor to move; The two-stage heated oils is carried out in refrigerating circuit separates; Because it is liquid that lubricant oil is always, and refrigeration agent can be heated to be gaseous state, adopts evaporating pipe and condensation tube to substitute vaporizer and condenser; Before condensation tube and after the evaporating pipe, deaerator is installed, is made the mixture of refrigeration agent and lubricant oil carry out gas-liquid separation through deaerator.This method of measurement is through heating oil content loop; Carry out the refrigeration cycle of some time; At first need carry out preheating to whole refrigeration system loop; The air temperature in whole loop is heated to some temperature spotss, successively carries out continuous operation and discontinuous cycle at oil content step tested compressor and stop the some time, the lubricant oil of sneaking into refrigeration system is separated from the mixture of refrigeration agent and lubricant oil through air-breathing deaerator and vent control valve gas separating device.
Description of drawings
Fig. 1 is the alternative refrigeration subsystem structural representation of measuring device of the present invention
Fig. 2 is the hardware frame figure of the communication subsystem of measuring device of the present invention;
Fig. 3 is the operating loop schematic representation of alternative refrigeration subsystem when preheating step of method of measurement of the present invention;
Fig. 4 is the alternative refrigeration subsystem of method of measurement of the present invention operating loop schematic representation when the operating procedure continuously;
Fig. 5 is the operating loop schematic representation of alternative refrigeration subsystem when discontinuous cycle is stopped operating procedure of method of measurement of the present invention;
Comprise among the figure: tested compressor 1, vent control valve subentry valve 2, vent control valve gas separating device 3, condensation tube 4, vent control valve divide outlet valve 5; Expansion valve 6, air-breathing oil content inlet valve 7, air-breathing deaerator 8, evaporating pipe 9, air-breathing oil content outlet valve 10; Equilibrium valve 11, exhaust by-pass valve 12, air-breathing bypass valve 13, oil content chamber 14, electric heating tube 1; Circulating fan 1, drawing fan 17, environmental chamber 18, electric heating tube 2 19, circulating fan 2 20; Vacuum valve 21, vacuum pump 22, charging valve 23, refrigerant cylinder 24.
Embodiment
Referring to a kind of device of measuring small-sized cold compressor oil circulation amount of Fig. 1; Comprise make compressor operating under the specific operation condition alternative refrigeration subsystem and carry out the communication subsystem of working condition control and the measurement of oily circulating load to substituting refrigeration subsystem; Alternative refrigeration subsystem comprises refrigerating operaton unit, refrigerant feeding unit and vacuum unit; Substitute refrigeration subsystem and adopt two-stage heated oils separation structure; Refrigerating operaton unit wherein: the relief opening of tested compressor 1 and intakeport divide outlet valve 5, expansion valve 6, air-breathing oil content inlet valve 7, evaporating pipe 9, air-breathing deaerator 8, air-breathing oil content outlet valve 10 to be in turn connected into a loop through exhaust port, air-breathing interface and vent control valve subentry valve 2, vent control valve gas separating device 3, condensation tube 4, vent control valve respectively; Exhaust by-pass valve 12 is connected in parallel on vent control valve subentry valve 2 and divides outlet valve 5 two ends with vent control valve; Air-breathing bypass valve 13 is connected in parallel on air-breathing oil content inlet valve 7 and air-breathing oil content outlet valve 10 two ends, and equilibrium valve 11 is connected in parallel on exhaust port and air-breathing interface two ends.Refrigerant cylinder 24 in the refrigerant feeding unit is connected to the air-breathing interface of tested compressor 1 through charging valve 23.The vacuum pump 22 of vacuum unit is connected to the exhaust port of tested compressor 1 through vacuum valve 21.Condensation tube 4 places in the oil content chamber 14 with evaporating pipe 9; Be furnished with the electric heating tube 1 and circulating fan 1 of regulating its ambient temperature in the oil content chamber 14; Drawing fan 17 is equipped with at evaporating pipe 9 places; The suction temperature of refrigerating operaton unit is regulated through control drawing fan 17; Tested compressor 1 is placed in the environmental chamber 18, is furnished with the electric heating tube 2 19 and circulating fan 2 20 that are used to regulate tested compressor 1 ambient temperature in the environmental chamber 18, and expansion valve 6 also links to each other with the stepper motor (not shown) of its opening degree of control; Opening degree through this stepper motor variable expansion valve is controlled evaporating temperature, and the condensing temperature of refrigerating operaton unit is regulated by the adding quantity of refrigeration agent.
The communication subsystem hardware frame of apparatus of the present invention is as shown in Figure 2, and communication subsystem adopts industrial control computer for the control core, is made up of electrical quantity acquisition module, step motor control module, data acquisition module, I/O control module.The electrical measurement instrument of electrical quantity acquisition module adopts single-phase comprehensive voltameter; Be connected with the RS-232 interface that links to each other with industrial control computer through the RS-485 isolating converter; Through the RS485 isolating converter, the electrical quantity that collects is sent to industrial control computer.Step motor control module: be connected with the RS-232 interface that links to each other with industrial control computer through the RS-485 isolating converter; Be used for rotating according to the stepper motor rotating speed of industrial control computer transmission and the signal drive motor of rotation angle; This step motor control module also with the isa bus slot that assigns into industrial control computer on the I/O control card link to each other; The signal drive motor of the stepper motor clockwise and anticlockwise that transmits according to industrial control computer, thus the control step motor is realized the opening degree of expansion valve and is regulated; Data acquisition module: link to each other with industrial control computer through isa bus; Be used to gather temperature value, force value and the vacuum measurement value that substitutes refrigeration subsystem; Data acquisition module: the temperature transmitter that comprise the PCL-813A/D capture card that links to each other with industrial control computer through isa bus, links to each other respectively through terminal board with the PCL-813A/D capture card and pressure transducer, the vacuum measuring instrument that links to each other with the PCL-813A/D capture card, the temperature transducer that links to each other with temperature transmitter, temperature transducer are used to gather the delivery temperature, inhalation temperature, oil content room environmental temperature, compressor environment room temperature of alternative refrigeration subsystem etc.; Pressure transducer is used to gather the exhaust pressure that substitutes refrigeration subsystem, pressure of inspiration(Pi) etc., and the PCL-813A/D capture card is used for the temperature value and the force value of gathering are passed to industrial control computer.I/O control module: comprise the PCL-730I/O control card that links to each other with industrial control computer through isa bus, the solid-state relay (SSR) and the relay board that link to each other with the PCL-730I/O control card respectively; Solid-state relay links to each other with electric heating tube, the vacuum pump of alternative refrigeration subsystem; Relay board links to each other with the power supply of the fan of alternative refrigeration subsystem, tested compressor, solenoid valve (comprising that vent control valve subentry valve 2, vent control valve divide outlet valve 5, air-breathing oil content inlet valve 7, air-breathing oil content outlet valve 10, equilibrium valve 11, exhaust by-pass valve 12, air-breathing bypass valve 13, vacuum valve 21, charging valve 23) respectively, the break-make of control line related.
The communication subsystem of apparatus of the present invention mainly is to accomplish functions such as parameter control, data capture, test form, and these are all accomplished through industrial control computer automatically.
The thermometry point that apparatus of the present invention substitute refrigeration subsystem is: delivery temperature, inhalation temperature, environmental chamber temperature and oil content room temperature.
The pressure measurement point that apparatus of the present invention substitute refrigeration subsystem is: the exhaust pressure of compressor and pressure of inspiration(Pi).
The electrical quantity of apparatus of the present invention is: the supply voltage of tested compressor, electric current, power, frequency, power factor.
In addition, apparatus of the present invention also will be measured the degree of vacuum of refrigeration system.
Apparatus of the present invention have adopted platinum resistance temperature sensor, and the platinum temperature detecting resistance is the most stable in temperature transducer, and temperature-measuring range is wide.Use the platinum resistance temperature sensor PT100 of the constant current three-wire system mode of connection in this device.Pressure transducer adopts PB8100BNM type diffused silicon pressure transmitter.DZA1 type resistance vacuum gauge is adopted in vacuum measurement.
The communication of variety of way for ease, the Data Acquisition Design of apparatus of the present invention the communication modes of various modes, RS232 is arranged, RS485, and CAN etc.Wherein the communication of voltameter and stepper motor all needs the RS485 communication, changes the communication of RS485 realization and process control machine through RS232.Data capture is connected through the CAN bus communication with industrial control computer.
Apparatus of the present invention are in running, and alternative refrigeration subsystem must be moved under certain operating mode, and working condition is shown in table one:
The oily circulating load test of table one working condition requirement
| Condensing temperature (℃) | 55±4 |
| Evaporating temperature (℃) | -23.3±3 |
| Suction temperature (℃) | 32±2 |
| The oil content ambient temperature (℃) | 60±2 |
| The Environmental Conditions temperature (℃) | 22±5 |
Communication subsystem is controlled the working condition that substitutes refrigeration system, promptly evaporating temperature, condensing temperature, suction temperature, ambient temperature and oil content room temperature is controlled.
1) evaporating temperature control
The evaporating temperature of refrigeration subsystem and pressure of inspiration(Pi) are corresponding, can realize the control to evaporating temperature through the control pressure of inspiration(Pi).Pressure of inspiration(Pi) is regulated by expansion valve 6, and the open degree of expansion valve 6 is little, and the flow that refrigeration agent passes through is just few, and pressure of inspiration(Pi) is just low; The open degree of expansion valve 6 is big, and the flow that refrigeration agent passes through is just many, and pressure of inspiration(Pi) is also just high.According to the thermal properties of refrigeration agent, pressure of inspiration(Pi) is low more, and corresponding evaporating temperature is just low more; Pressure of inspiration(Pi) is high more, and corresponding evaporating temperature is also just high more.Therefore regulate through the software pair stepper motor that links to each other with expansion valve, just can control evaporating temperature.
2) condensing temperature control
The condensing temperature of refrigeration subsystem and exhaust pressure are corresponding, can realize the control to condensing temperature through the control exhaust pressure.Native system is mainly controlled exhaust pressure through the adding quantity of refrigeration agent.According to the thermal properties of refrigeration agent, exhaust pressure is low more, and corresponding condensing temperature is just low more; Exhaust pressure is high more, and corresponding condensing temperature is also just high more.Therefore through software refrigerant cylinder and charging valve are controlled, just can be controlled condensing temperature.
3) suction temperature control
The height of suction temperature is to realize regulating in the drawing fan 17 through control evaporating pipe 9.One 15 pairs of evaporating pipes of electric heating tube 9 by oil content chamber 14 heat with condensation tube 4, when evaporating pipe 9 temperature are too high, start drawing fan 17 and reduce suction temperature.Therefore control the switch of drawing fan 17 through software, just can control suction temperature.
4) ambient temperature control
Ambient temperature is to be controlled by electric heating tubes in the environmental chamber 18 2 19 and circulating fans 2 20, crosses when low when ambient temperature, can make ambient temperature even through the heating to environmental chamber 18.
5) oil content room temperature control
Oil content chamber 14 temperature are to add heat control by the electric heating tubes 1 in the oil content chamber 14, cool off control through circulating fan 1, can operate that to control whole oil content room temperature even through heating and cooling.
Apparatus of the present invention are typical computer testing and control closed-loop system, and the developing instrument of software design is selected Delphi 7 for use, and this developing instrument is a kind of visual high-level programming language that runs under the windows platform, is suitable for developing form class application program.This TT&C software no longer is confined to simple data capture and Equipment Control, has more increased functions such as real-time curve demonstration, data management and analysis, process intelligent control, the automatic printing of form.
Oily circulating load method of measurement of the present invention makes tested compressor under voltage rating, adopts operation continuously and circulation to stop the metering system that is used in combination and measures, and carries out oil according to the following steps and separates:
1) preheating step: compressor and starting (1), close equilibrium valve (11), pass vent control valve subentry valve (2), vent control valve divide outlet valve (5), air-breathing oil content inlet valve (7), air-breathing oil content outlet valve (10); Gas bypass valve (12), air-breathing bypass valve (13) begin to rehearse; Control substitutes refrigeration subsystem and reaches certain operating mode, accomplishes the preheating of refrigerating circuit and compressor, beginning heated oils locellus 14; And the ambient temperature of oil content chamber 14 transferred to 50～70 ℃, ambient temperature the best of oil content chamber 14 is 60 ℃; Preheat time, T1 was 60～120 minutes; Make compressor operating reach steady state, compressor reaches thermal equilibrium in the operating mode and the environment operation of regulation, is masked as the compression case temperature and is the level fluctuation basically; The experiment proof: compressor operating is after 90 minutes; Case temperature fluctuation is in ± 1 ℃, and hot air flow is through the loop shown in the arrow among Fig. 3, and the air temperature in whole loop is heated to temperature spots.
2) continuous operating procedure: compressor and starting (1), close equilibrium valve (11), close exhaust by-pass valve (12), air-breathing bypass valve (13), the gas and oil subentry valve (2) that begins to rehearse, vent control valve divide outlet valve (5), air-breathing oil content inlet valve (7), air-breathing oil content outlet valve (10); Continuous operating time T2 is 2～4 hours, and time T 2 the bests are 3 hours; Refrigerating circuit moves shown in arrow among Fig. 4, realizes the continuous heating of refrigeration agent and oil mixture, is lubricated oil and separates, and makes the mixture of refrigeration agent and lubricant oil carry out gas-liquid separation through deaerator.
3) discontinuous cycle is stopped operating procedure: be divided into compressor and open and close two steps; The refrigerating circuit operation is as shown in Figure 5; Opening step, compressor (1) leaves, and equilibrium valve (11) closes; Close exhaust by-pass valve (12), air-breathing bypass valve (13), the gas and oil subentry valve (2) that begins to rehearse, vent control valve divide outlet valve (5), air-breathing oil content inlet valve (7), air-breathing oil content outlet valve (10); Air communication is crossed pipeline operation shown in the arrow among Fig. 51, and running time T 5 is 10～20 minutes, and time T 5 the bests are 10 minutes; Closing step, compressor (1) closes, and equilibrium valve (11) leaves, and closes exhaust by-pass valve (12), air-breathing bypass valve (13), and the gas and oil subentry valve (2) that begins to rehearse, vent control valve divide outlet valve (5), air-breathing oil content inlet valve (7), air-breathing oil content outlet valve (10); Air communication is crossed pipeline operation shown in the arrow among Fig. 52; Running time T 6 is 10～20 minutes, and time T 6 the bests are 10 minutes, and the summation of time T 5 and T6 is an operation period T4; It is 10～15 cycles that discontinuous cycle is stopped the operating procedure time, and the best is 12 cycles.
4) step of weighing: after operating procedure and discontinuous cycle are stopped operating procedure continuously; From air-breathing deaerator (8) and vent control valve gas separating device (3), get oil through graduated cylinder respectively, two steps (operating procedure and discontinuous cycle are stopped operating procedure continuously) oil mass summation is oily circulating load.
The oil filling amount of general mini-type refrigeration compressor is about 300 grams, and for guaranteeing the normal operation of compressor, the total points oil mass does not surpass 5%; Actual test result; The oil drain quantity of general mini-type refrigeration compressor is at 1.6 Grams Per Hours, so total branch oil working time (operation+discontinuous cycle is stopped operation continuously) of compressor is controlled at about 9 hours, and general mini-type refrigeration compressor is in designing application; The ratio that accounts for total branch oil working time the working time of compressor is about 60%; Therefore, operation and discontinuous cycle are stopped in the operation test continuously, and the working time of compressor is also basically in this ratio.
The specific operation process that apparatus of the present invention are carried out oily circulating load measurement is following:
1) tested compressor 1 is installed on the test platform, after connection finishes, opens general power, login the TT&C software system;
2) will substitute refrigeration subsystem vacuumizes.At first open oil content valve, bypass valve, the equilibrium valve of vacuum valve and test system, start vacuum pump then, will substitute refrigeration system and vacuumize;
3) refrigerant feeding in substituting refrigeration system.At first close vacuum valve and vacuum pump, open charging valve then, in tested refrigeration system, add the refrigeration agent of appropriate amount as requested, close all solenoid valves at last;
4) beginning official testing gets into warm-up phase, successively through preheating, heat continuously and stop three phases, accomplish oily circulating load test, in the process of test, regulate substituting the refrigeration system operating mode automatically, make it to operate in the predetermined range;
5) behind the EOT, automatic printing test form, shutdown test system.
From the interpretation of result that test draws, we can draw the optimum of the lubricant oil oil filling amount of mini-type refrigeration compressor, and this result is very significant to the performance and life-span of compressor.
Apparatus of the present invention belong to full-automatic type cold compressor oil circulation amount testing apparatus.This contrive equipment can be accomplished system switching, self check, control work condition, the required project of detection, processing data, preservation data, printing reports automatically, can also accomplish refrigerant feeding, vacuumizes, low-voltage variation etc.The present invention contains intelligent control and manually two kinds of model selections of control, can carry out manual tune to cooling condition, and the valve in the refrigeration system is carried out hand switch control.
The degree of accuracy of this testing apparatus is high, and test result accurately and reliably.Test process is visual, and abnormal conditions are swift in response.Test bench is multiple functional, and level of integration is high, and is simple to operation, and flexible design, and expansivity is strong.
Claims (9)
1. device of measuring small-sized cold compressor oil circulation amount; Comprise make compressor operating under the specific operation condition alternative refrigeration subsystem and carry out the communication subsystem of working condition control and the measurement of oily circulating load to substituting refrigeration subsystem; Alternative refrigeration subsystem comprises refrigerating operaton unit, refrigerant feeding unit and vacuum unit; Said refrigerant feeding unit is equipped with refrigerant cylinder (24); Said vacuum unit is equipped with vacuum pump (22); It is characterized in that: substitute refrigeration subsystem and adopt two-stage heated oils separation structure; Tested compressor (1) relief opening of wherein said refrigerating operaton unit and intakeport divide outlet valve (5), expansion valve (6), air-breathing oil content inlet valve (7), evaporating pipe (9), air-breathing deaerator (8), air-breathing oil content outlet valve (10) to be in turn connected into a loop through exhaust port, air-breathing interface and vent control valve subentry valve (2), vent control valve gas separating device (3), condensation tube (4), vent control valve respectively, and exhaust by-pass valve (12) is connected in parallel on vent control valve subentry valve (2) and vent control valve divides outlet valve (5) two ends, and air-breathing bypass valve (13) is connected in parallel on air-breathing oil content inlet valve (7) and air-breathing oil content outlet valve (10) two ends; Equilibrium valve (11) is connected in parallel on exhaust port and air-breathing interface two ends; Said specific operation condition: 55 ± 4 ℃ of condensing temperatures, evaporating temperature-23.3 ± 3 ℃, 32 ± 2 ℃ of suction temperatures; 60 ± 2 ℃ of oil content ambient temperatures, 22 ± 5 ℃ of compressor Environmental Conditions temperature.
2. a kind of device of measuring small-sized cold compressor oil circulation amount as claimed in claim 1; It is characterized in that: said evaporating pipe (9) and condensation tube (4) place in the oil content chamber (14); Be furnished with electric heating tube one (15) and the circulating fan one (16) of regulating its ambient temperature in the oil content chamber (14); Evaporating pipe (9) locates to be equipped with drawing fan (17), and the suction temperature of refrigerating operaton unit is regulated through control drawing fan (17), and tested compressor (1) is placed in the environmental chamber (18); Be furnished with the electric heating tube two (19) and the circulating fan two (20) that are used to regulate compressor ambient temperature in the environmental chamber (18); Said expansion valve (6) also links to each other with the stepper motor of its opening degree of control, controls evaporating temperature through the opening degree of this stepper motor variable expansion valve (6), and the condensing temperature of refrigerating operaton unit is regulated by the adding quantity of refrigeration agent.
3. according to claim 1 or claim 2 a kind of device of measuring small-sized cold compressor oil circulation amount, it is characterized in that: the refrigerant cylinder (24) in the said refrigerant feeding unit is connected to the air-breathing interface of tested compressor (1) through charging valve (23).
4. according to claim 1 or claim 2 a kind of device of measuring small-sized cold compressor oil circulation amount, it is characterized in that: the vacuum pump of said vacuum unit (22) is connected to the exhaust port of tested compressor (1) through vacuum valve (21).
5. utilization device according to claim 1 or claim 2 carries out the method that oily circulating load is measured, and it is characterized in that carrying out according to the following steps oil and separates:
1) preheating step: compressor and starting (1); Close equilibrium valve (11); Pass vent control valve subentry valve (2), vent control valve divide outlet valve (5), air-breathing oil content inlet valve (7), air-breathing oil content outlet valve (10); Begin to rehearse gas bypass valve (12), air-breathing bypass valve (13), control substitute refrigeration subsystem and reach certain operating mode, and the ambient temperature of oil content chamber (14) is transferred to 50～70 ℃; Preheat time, T1 was 60～120 minutes;
2) continuous operating procedure: compressor and starting (1), close equilibrium valve (11), close exhaust by-pass valve (12), air-breathing bypass valve (13), the gas and oil subentry valve (2) that begins to rehearse, vent control valve divide outlet valve (5), air-breathing oil content inlet valve (7), air-breathing oil content outlet valve (10); Continuous operating time T2 is 2～4 hours;
3) discontinuous cycle is stopped operating procedure: be divided into compressor and open and close two steps; Opening step; Compressor (1) leaves, and equilibrium valve (11) closes, and closes exhaust by-pass valve (12), air-breathing bypass valve (13); Begin to rehearse gas and oil subentry valve (2), vent control valve divides outlet valve (5), air-breathing oil content inlet valve (7), air-breathing oil content outlet valve (10), and running time T 5 is 10～20 minutes; Closing step; Compressor (1) closes, and equilibrium valve (11) leaves, and closes exhaust by-pass valve (12), air-breathing bypass valve (13); Begin to rehearse gas and oil subentry valve (2), vent control valve divides outlet valve (5), air-breathing oil content inlet valve (7), air-breathing oil content outlet valve (10); Running time T 6 is 10～20 minutes, and the summation of time T 5 and T6 is an operation period T4, and it is 10～15 cycles that discontinuous cycle is stopped the operating procedure time.
4) step of weighing: after operating procedure and discontinuous cycle are stopped operating procedure continuously, from air-breathing deaerator (8) and vent control valve gas separating device (3), get oil through graduated cylinder respectively, two step oil mass summations are oily circulating load.
6. the method that oily circulating load as claimed in claim 5 is measured, it is characterized in that: the ambient temperature the best of oil content chamber (14) is 60 ℃ in the said preheating step.
7. the method that oily circulating load as claimed in claim 5 is measured, it is characterized in that: time T 1 the best of said preheating step is 90 minutes.
8. the method that oily circulating load as claimed in claim 5 is measured, it is characterized in that: time T 2 the bests of said continuous operating procedure are 3 hours.
9. the method that oily circulating load as claimed in claim 5 is measured; It is characterized in that: said discontinuous cycle is stopped operating procedure; The running time T 5 of wherein opening step is 10 minutes, and the running time T 6 of closing step is 10 minutes, and it is 12 cycles that discontinuous cycle is stopped operating procedure time optimal.
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| CN109404272A (en) * | 2018-12-04 | 2019-03-01 | 长虹华意压缩机股份有限公司 | Equipment for testing oil discharge capacity of compressor and oil circulation performance of refrigerating system |
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