CN104764253A - Refrigerating system - Google Patents
Refrigerating system Download PDFInfo
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- CN104764253A CN104764253A CN201510149802.3A CN201510149802A CN104764253A CN 104764253 A CN104764253 A CN 104764253A CN 201510149802 A CN201510149802 A CN 201510149802A CN 104764253 A CN104764253 A CN 104764253A
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- temperature
- compressor
- oil
- throttle element
- refrigeration system
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
- F25B41/30—Expansion means; Dispositions thereof
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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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
- F25B49/022—Compressor control arrangements
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a refrigerating system. The refrigerating system comprises a compressor, wherein the compressor has a gas discharge opening and a gas return opening, the lower part of the side wall of the compressor is provided with an oil mass detecting port, and a detecting access line is connected between the oil mass detecting port and the gas return opening; an oil separator, wherein the oil separator has an inlet and an oil return opening, the inlet is connected with a gas discharge opening, and a first throttling element having throttling pressure-reducing function and used for adjusting the flow of the lubricating oil is serially connected between the oil return opening and the gas return opening; a second throttling element having throttling pressure-reducing function and used for adjusting the flow of the liquid, wherein the second throttling element is serially connected to the detecting access line; and two temperature detecting devices, wherein two temperature detecting devices are respectively used for detecting the temperatures of the liquid at two ends of the second throttling element, while the second throttling element is opened and the temperature difference DeltaT between the temperatures detected by two temperature detecting devices is greater than the stated value, the first throttling element is opened. The refrigerating system is capable of automatically judging whether the compressor needs to return the oil, and achieving the oil return according to need.
Description
Technical field
The present invention relates to refrigerating field, particularly relate to a kind of refrigeration system.
Background technology
Multiple on-line system is compared with traditional central air conditioner system, have economize energy, operating cost low, save advantages such as taking up room, control advanced person, reliable, easy to maintenance, unit adaptability is good, cooling and warming temperature range is wide, design freedom is high, install and charging is convenient, so multiple on-line system particularly connected machine system obtains increasingly extensive application at present in small and medium construction and part public building.
But multiple on-line system is due to design features such as pipeline are long, drop is large, elbow is many, and the place of system trapped fuel is more, oil return difficulty.Along with the increase of the multi-connected machine duration of runs, in system, lubricating oil can be cumulative, finally causes compressor oil starvation to operate.Therefore multiple on-line system must increase oil return running to ensure that security of system is effectively run.
In correlation technique, multiple on-line system oil return system generally comprises oil eliminator and oil return and to circulate two parts.Connected machine is under the state of underload, and refrigerant flow rates is lower, and oil return is more difficult, this difficulty for the larger outdoor unit of capacity because return-air caliber is obvious very greatly and more.Therefore, need oil return circulation frequently, thus consume more electric power, cause waste.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the present invention proposes a kind of refrigeration system, and this refrigeration system can detect and oil return as required automatically, thus reduces oil return running number of times to a certain extent.
According to the refrigeration system of the embodiment of the present invention, comprising: compressor, described compressor has exhaust outlet and gas returning port, and the bottom of the sidewall of described compressor is provided with oil mass and detects mouth, and described oil mass detects between mouth and described gas returning port and is connected with detection path; Oil eliminator, described oil eliminator has entrance and oil return opening, and described entrance is connected with described exhaust outlet, is in series with to have reducing pressure by regulating flow effect and for regulating the first throttle element of flow of lubrication between described oil return opening and described gas returning port; There is reducing pressure by regulating flow effect and for regulating the second section fluid element of fluid flow, described second section fluid element is connected in described detection path; Two temperature-detecting devices, described two temperature-detecting devices are respectively used to the temperature of the fluid at the two ends detecting described second section fluid element, when temperature difference △ T between the temperature that second section fluid element is opened and described two temperature-detecting devices detect is greater than setting value, described first throttle element is opened.
According to the refrigeration system of the embodiment of the present invention, mouth is detected by arranging oil mass on the compressor, connection detection circuit between mouth and gas returning port is detected in oil mass, two temperature-detecting devices are utilized to detect the temperature of second section fluid element two ends fluid, when second section fluid element is opened and the difference of temperature that two temperature-detecting devices detect is greater than setting value, first throttle element is opened, realize automatically detecting and oil return as required, thus reduce oil return running number of times to a certain extent, and then save electric energy to a certain extent.
In addition, according to the refrigeration system of the embodiment of the present invention, following additional technical feature can also be had:
Alternatively, described second section fluid element comprises the capillary and control valve that are connected in series.
Alternatively, described second section fluid element is electric expansion valve.
Particularly, described first throttle element is the capillary and magnetic valve that are connected in series.
Alternatively, after described compressor start first scheduled time, open described second section fluid element, described two temperature-detecting device detected temperatures are to obtain temperature difference △ T.
Alternatively, when described temperature difference △ T is greater than described setting value twice continuously, then the opening time interval of described first throttle element reduces very first time value, and the opening time interval of described first throttle element is not less than the second time value.
Preferably, when the opening time interval of described first throttle element is shortened, the unlatching of described first throttle element increases running time.
Preferably, when described temperature difference △ T is greater than described setting value three times continuously, described compressor cuts out.
Alternatively, when described temperature difference △ T is less than described setting value four times continuously, the opening time interval of described first throttle element increased for second time interval.
Accompanying drawing explanation
Fig. 1 is the structure chart of the refrigeration system according to the embodiment of the present invention;
Fig. 2 is the enlarged drawing in the B portion that Fig. 1 centre circle shows;
Fig. 3 is the partial enlarged drawing of refrigeration system in accordance with another embodiment of the present invention;
Fig. 4 is the flow chart of refrigeration system according to an embodiment of the invention.
Reference numeral:
100: refrigeration system;
1: compressor; 2: oil eliminator; 3: first throttle element; 4: second section fluid element;
5: temperature-detecting device; 6: capillary; 7: control valve; 8: magnetic valve;
51: the first temperature-detecting device 52: the second temperature-detecting devices;
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection or each other can communication; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
The refrigeration system 100 according to the embodiment of the present invention is described in detail referring to Fig. 1-Fig. 3.
As depicted in figs. 1 and 2, compressor 1, oil eliminator 2, first throttle element 3, second section fluid element 4 and two temperature-detecting devices 5 can be comprised according to the refrigeration system 100 of the embodiment of the present invention.
Specifically, as depicted in figs. 1 and 2, the low temperature sucked, low-pressure refrigerant vapor can be improved temperature and pressure by compression by compressor 1, refrigerant in refrigeration system 100 is moved up, reach refrigeration for follow-up heat to power output or heat object power is provided, as shown in Figure 3, compressor 1 can have exhaust outlet and gas returning port, the lower sidewall of compressor 1 can be provided with oil mass and detect mouth, and, oil mass detects between mouth and gas returning port can be connected with detection path, thus provides foundation the need of oil return for follow-up automatic decision.
As preferred embodiment, as shown in Figure 1, Figure 2 and Figure 3, compressor 1 can be multiple parallel connection, and viewing system needs flexible combination.
It should be noted that, the position of oil mass detection mouth can be consistent with compressor 1 minimum safe oil mass altitude line, like this, when the lubricating oil in compressor 1 is lower than minimum safe oil mass height, can think compressor 1 oil starvation, thus oil return apparatus oil return can be started, to realize the function of oil return as required.
As shown in Figure 1, Figure 2 and shown in Fig. 3, oil eliminator 2 has entrance and oil return opening, wherein, the entrance of oil eliminator 2 can be connected with the exhaust outlet of compressor 1, thus oil eliminator 2 can be entered from entrance by the refrigerant of compressor 1 and the mixture of lubricating oil, by the separation of oil eliminator 2, refrigerant and lubricating oil separation, refrigerant can enter condenser further, complete follow-up kind of refrigeration cycle, and lubricating oil is gathered in the bottom of oil eliminator 2, flows through follow-up oil return control device get back in compressor 1 by oil return opening.
And, first throttle element 3 can be in series with between oil return opening and gas returning port, as depicted in figs. 1 and 2, first throttle element 3 has reducing pressure by regulating flow effect and for regulating the flow of lubricating oil, like this, first throttle element 3 can regulate the flow of the lubricating oil separated from oil eliminator 2, is compressor 1 oil return.
As depicted in figs. 1 and 2, second section fluid element 4 can be connected in detection path, second section fluid element 4 can have reducing pressure by regulating flow effect, and, second section fluid element 4 can be used for the flow regulating fluid, thus, second section fluid element 4 can be utilized further to provide foundation, to realize the object of oil return as required for follow-up detection and judgement.
For temperature-detecting device 5, can be two, and, two temperature-detecting devices 5 can be respectively used to the temperature of the fluid at the two ends detecting second section fluid element 4, such as, as depicted in figs. 1 and 2, temperature detector can comprise the first temperature-detecting device 51 and the second temperature-detecting device 52, first temperature-detecting device 51 can be located at the position of the close oil mass detection mouth of second section fluid element 4, the temperature of the fluid of mouth position is detected for detecting oil mass, second temperature-detecting device 52 can be located at the position of second section fluid element 4 near gas returning port, for detecting the temperature of the fluid after second section fluid element 4 reducing pressure by regulating flow.
Be understandable that, the temperature that first temperature-detecting device 51 detects is the temperature that in compressor 1, oil mass detects the fluid of mouth position, the fluid temperature (F.T.) that what the second temperature-detecting device 52 detected is after second section fluid element 4 reducing pressure by regulating flow, when lubricants capacity bottom compressor 1 is normally namely higher than minimum safe oil mass altitude line, now, in the fluid of second section fluid element 4 reducing pressure by regulating flow, major part is lubricating oil, so the temperature that the first temperature-detecting device 51 and the second temperature-detecting device 52 detect is substantially identical.When the lubricating oil in compressor 1 is extremely namely lower than minimum safe oil mass altitude line, now, fluid through second section fluid element 4 reducing pressure by regulating flow is refrigerant, refrigerant temperature after reducing pressure by regulating flow has and reduces largely, so the temperature that now the first temperature-detecting device 51 and the second temperature-detecting device 51 detect has the larger temperature difference.
Under second section fluid element 4 opening, when temperature difference △ T between the temperature that two temperature-detecting devices 5 detect is greater than setting value, first throttle element 3 is opened, that is, when the difference of the temperature that the first temperature-detecting device 51 and the second temperature-detecting device 52 detect is greater than setting value, represent that the fluid through second section fluid element 4 reducing pressure by regulating flow is refrigerant, now, can judge that the lubricating oil in compressor 1 detects mouth lower than oil mass, namely the lubricating oil in compressor 1 is lower than minimum safe oil mass altitude line, first throttle element 3 is opened, the lubricating oil be gathered in bottom oil eliminator 2 can be made to get back in compressor 1, thus realize oil return, so just can automatic decision compressor 1 whether oil starvation realize oil return as required.
It should be noted that, two temperature-detecting devices 5, indirectly can be connected by controller (not shown) between first throttle element 3 and second section fluid element 4, undertaken judging and controlling by controller.
According to the refrigeration system 100 of the embodiment of the present invention, mouth is detected by arranging oil mass on compressor 1, detect between mouth and gas returning port in oil mass and connect detection path, two temperature-detecting devices 5 are utilized to detect the temperature of second section fluid element 4 two ends fluid, when second section fluid element 4 is opened and the difference of temperature that two temperature-detecting devices 5 detect is greater than setting value, compressor 1 oil starvation can be judged, thus can the lubricating oil in compressor 1 be detected automatically, prevent compressor 1 from burning out because of oil starvation running, when judged result is compressor 1 oil starvation, open first throttle element 3, realize oil return as required, thus reduce oil return running number of times to a certain extent, and then save electric energy to a certain extent.
According to some embodiments of the present invention, as depicted in figs. 1 and 2, second section fluid element 4 can comprise capillary 6 and control valve 7, and, capillary 6 and control valve 7 are connected in series, and by capillary 6 reducing pressure by regulating flow, and utilize control valve 7 to control the break-make of the stream of detection path, for temperature-detecting device 5 provides detection foundation, to realize the oil return as required of follow-up automatic decision.
For temperature-detecting device 5, can be two, and, two temperature-detecting devices 5 can be respectively used to the temperature of the fluid at the two ends detecting second section fluid element 4, such as, as shown in Figure 1, Figure 2 and Figure 3, temperature detector can comprise the first temperature-detecting device 51 and the second temperature-detecting device 52.
In examples more of the present invention, as depicted in figs. 1 and 2, first temperature-detecting device 51 can be located at the position of the close oil mass detection mouth of second section fluid element 4, the temperature of the fluid of mouth position is detected for detecting oil mass, second temperature-detecting device 52 can be located at the position after the control valve 7 of second section fluid element 4, for detecting the temperature of the fluid through capillary 6 and control valve 7.
In other examples of the present invention, as shown in Figure 3, the second temperature-detecting device 52 can be located between the capillary 6 of second section fluid element 4 and control valve 7, for detecting the temperature of fluid after capillary 6 reducing pressure by regulating flow.
Be understandable that, second temperature-detecting device 52 no matter to be located at before control valve 7 or after, its temperature detected is all the temperature of fluid in detection path after reducing pressure by regulating flow, and the temperature that the first temperature-detecting device 51 detects be reducing pressure by regulating flow before the temperature of fluid in detection path, so the second temperature-detecting device 52 does not have much affect to testing result with the installation site of control valve 7.
According to other embodiments of the present invention, second section fluid element 4 can be electric expansion valve, is realized automatic adjustment and the reducing pressure by regulating flow of fluid flow in this stream, for following temperature checkout gear 5 provides foundation by electric expansion valve.
For first throttle element 3, as depicted in figs. 1 and 2, first throttle element 3 can comprise the capillary 6 and magnetic valve 8 that are connected in series, like this, by capillary 6 reducing pressure by regulating flow, and utilize magnetic valve 8 control flow check through the break-make of the stream of first throttle element 3, can be in time compressor 1 oil return, thus realize oil return as required.Meanwhile, because first throttle element 3 and second section fluid element 4 can have identical structural detail capillary 6, so can interchangeability be improved, reduce costs.
As optional embodiment, can set for first scheduled time, such as, first scheduled time can be set as t, and the first scheduled time t can be 20 minutes, after compressor 1 starts 20 minutes, open second section fluid element 4, the segment fluid flow in compressor 1 can detect mouth from oil mass and flow out through second section fluid element 4, now, the temperature-detecting device 5 being located at second section fluid element 4 two ends can carry out temperature detection to the fluid of inflow and outflow second section fluid element 4, thus obtains temperature difference △ T.
According to some embodiments of the present invention, first throttle element 3 can be set at interval of a period of time Δ T
1opening once, is compressor 1 oil return, such as, and the opening time interval delta T of first throttle element 3
120 minutes can be set to.Further, can the setting value of design temperature difference be A, such as, setting value A can be set to 15 DEG C.When temperature difference △ T is double be greater than setting value A time, the opening time interval delta T of first throttle element 3
1can reduce very first time value, such as, very first time value can establish t
1it is 5 minutes.It should be noted that, the opening time interval delta T of first throttle element 3
1be not less than the second time value, such as, the second time value can be set to 10 minutes.
That is, the initial temporally interval delta T of first throttle element 3
1open, be compressor 1 oil return, when temperature difference △ T is double be greater than setting value A time, can judge the double oil starvation of compressor 1, the opening time of first throttle element 3 is spaced apart Δ T
1-very first time value t, thus shorten the time interval that first throttle element 3 is compressor 1 oil return, but the opening time interval delta T 1 of first throttle element 3 can not be less than the second time value.
Be described for the unlatching situation of concrete example to first throttle element 3 below, first throttle element 3 is opened as compressor 1 oil return by 20 minutes intervals, when temperature difference △ T is double be greater than 15 DEG C time, the opening time interval of first throttle element 3 reduces 5 minutes, namely open once by 15 minutes intervals, after the opening time interval of first throttle element 3 is reduced to 10 minutes, no longer continue to reduce, thus automatically detect compressor 1 the need of oil return, and realize oil return as required.
As preferred embodiment, when the opening time interval delta T of first throttle element 3
1during shortening, the unlatching of first throttle element 3 can increase running time, and the unlatching of first throttle element 3 can be set to Δ T running time
2, that is, when detection path judges compressor 1 oil starvation, the opening time interval delta T of first throttle element 3
1shorten, first throttle element 3 is that the number of times of compressor 1 oil return increases, and makes each unlatching Δ running time T of first throttle element 3
2increase, the recirculating oil quantity of first throttle element 3 can be made to increase, thus meet the needs of compressor 1.
More preferably, temperature difference △ T between the temperature that two temperature-detecting devices 5 detect is continuous when being greater than setting value A tri-times for three times, compressor 1 can cut out, be understandable that, temperature difference △ T between the temperature that temperature-detecting device 5 detects is continuous when being greater than setting value A three times, continuous three oil starvations of compressor 1, if now system works on, very likely there is oil starvation fault, compressor 1 cuts out, the early warning protection of the long-term oil starvation of compressor 1 can be realized, thus can avoid occurring the phenomenon that compressor 1 burns because oil starvation running to a certain extent.
In one embodiment of the invention, when the temperature difference △ T between the temperature that two temperature-detecting devices 5 detect is less than setting value A tetra-times continuously, the opening time interval delta T of first throttle element 3
2can increase for second time interval, second time interval can be set to t
2that is, when under compressor 1 normal operating conditions, when the temperature difference △ T between the temperature that two temperature-detecting devices 5 detect is less than setting value A tetra-times continuously, oil starvation and compressor 1 oil return are not satisfied the demand, by the opening time interval delta T of first throttle element 3 can to judge compressor 1
2increase, the demand of compressor 1 pair of lubricating oil can be met on the one hand, the number of times of system oil return running can be reduced on the other hand, thus save electric energy to a certain extent.
To sum up, according to the refrigeration system 100 of the embodiment of the present invention, by detecting mouth in the bottom of compressor 1 setting oil mass, two temperature-detecting devices 5 are utilized to detect the temperature at detection path two ends, compared by temperature difference △ T between detect two temperature and setting value A, when temperature difference △ T is greater than setting value A, controller controls first throttle element 3, thus be compressor 1 oil return by first throttle element 3, and then guarantee that compressor 1 can normally work.When the double judgement compressor of detection path 1 oil starvation, by the opening time interval delta T of first throttle element 3
1shorten, open Δ T running time
2increase, and when detection path detection temperature difference continuous be less than setting value four times time, by the opening time interval delta T of first throttle element 3
1increase, realize the oil return as required to compressor 1.And when continuous three judgement compressor 1 oil starvations of detection path, close compressor 1, realizes the early warning protection of the long-term oil starvation of compressor 1, prevent compressor 1 from burning because of long-term oil starvation running.
Below in conjunction with Fig. 1 and Fig. 2 and the operation principle of composition graphs 3 to the refrigeration system 100 according to the embodiment of the present invention be described in detail.
The lower sidewall of compressor 1 is provided with oil mass and detects mouth, detection path connects this oil mass and detects mouth and gas returning port, as depicted in figs. 1 and 2, the exhaust outlet of compressor 1 is connected with oil eliminator 2, after compressor 1 compresses, the fluid of HTHP enters oil eliminator 2, by the separation of oil eliminator 2, refrigerant and lubricating oil separation are opened, refrigerant can enter condenser further and carry out kind of refrigeration cycle, lubricating oil is gathered in the bottom of oil eliminator 2, gets back to compressor 1 in after flowing through the control reducing pressure by regulating flow of first throttle element 3 from oil return opening.
As depicted in figs. 1 and 2, detection path is in series with second section fluid element 4, the two ends of second section fluid element 4 are provided with the first temperature-detecting device 51 and the second temperature-detecting device 52, wherein, first temperature-detecting device 51 is located at the position detecting mouth near oil mass, detect the temperature of the fluid of mouth position for detecting oil mass, the second temperature-detecting device 52 is located at the position near gas returning port, for detecting the temperature of the fluid flowing through second section fluid element 4.
When compressor 1 operates, in detection path, fluid in compressor 1 can detect mouth from oil mass and flow out, successively through the first temperature-detecting device 51, second section fluid element 4 and the second temperature-detecting device 52, the temperature that first temperature-detecting device 51 detects is the temperature that oil mass detects the fluid of mouth, because second section fluid element 4 has the effect of reducing pressure by regulating flow, so the temperature that the second temperature-detecting device 52 detects is the temperature of the fluid after reducing pressure by regulating flow.
When oil starvation does not operate for the normal work of compressor 1 and compressor 1, lubricating oil liquid level in compressor 1 is higher than minimum safe oil mass altitude line, now, the fluid major part flowing to detection path from oil mass detection mouth is lubricating oil, lubricating oil is after second section fluid element 4 reducing pressure by regulating flow, temperature is substantially unchanged, therefore temperature difference △ T between the temperature that detects of the first temperature-detecting device 51 and the second temperature-detecting device 52 is less.
And when compressor 1 operation irregularity and the running of compressor 1 oil starvation, lubricating oil liquid level in compressor 1 is lower than minimum safe oil mass altitude line, now, the fluid major part flowing to detection path from oil mass detection mouth is refrigerant, the temperature that first temperature-detecting device 51 detects is the temperature of the refrigerant before non-reducing pressure by regulating flow, refrigerant temperature after second section fluid element 4 reducing pressure by regulating flow has and reduces largely, so the temperature that the second temperature-detecting device 52 detects is the temperature of refrigerant after reducing pressure by regulating flow, thus the temperature difference △ T now between the temperature that detects of the first temperature-detecting device 51 and the second temperature-detecting device 52 is larger.
According to some embodiments of the present invention, can set setting value A, an A value and can take into account various load in stream through experimental calculation gained, such as, A value can be set to 15 DEG C.
Under detection path open mode, when temperature difference △ T between the temperature that first temperature-detecting device 51 and the second temperature-detecting device 52 detect is less than or equal to setting value A, can judge that the fluid detecting mouth inflow detection path from oil mass is lubricating oil, be understandable that, now, the liquid level of lubricating oil greater than or equal to minimum safe oil mass altitude line, so, just can judge that now compressor 1 is in not oil starvation state, namely compressor 1 is working properly.
When detection path is opened, when temperature difference △ T between the temperature that first temperature-detecting device 51 and the second temperature-detecting device 52 detect is greater than setting value A, can judge that the fluid detecting mouth inflow detection path from oil mass is refrigerant, be understandable that, now, the liquid level of lubricating oil lower than minimum safe oil mass altitude line, so, just can judge that now compressor 1 is in oil starvation state, thus realize automatic decision compressor 1 the need of oil return.
Further, when temperature difference △ T is greater than setting value A, namely when compressor 1 is in oil starvation state, first throttle element 3 is opened, make the lubricating oil be gathered in bottom oil eliminator 2 flow back to compressor 1, realize oil return as required, can not only prevent compressor 1 from burning because of oil starvation running, and the running number of times of system oil return can be reduced, thus save electric energy.
Below in conjunction with Fig. 4, the course of work of the refrigeration system 100 according to the specific embodiment of the invention is described in detail.
Refrigeration system needs the setting value A of set temperature difference in the controller, the first scheduled time t before starting to start, the initial interval Δ T that first throttle element is opened
1, Δ T running time that first throttle element is opened
2, very first time value t
1with the second time interval t
2.A, t, Δ T
1, Δ T
2, t
1and t
2can be that refrigeration system factory default is arranged, such as, can the setting value A=15 DEG C of design temperature difference, the first scheduled time t=20 minute, the initial interval that first throttle element is opened is Δ T
1=20 minutes, the initial operating time that first throttle element is opened was Δ T
2=3 minutes, very first time value was t
1=5 minutes, second time interval was t
2=5 minutes.
As shown in Figure 4, the course of work of refrigeration system can comprise the following steps:
S101, refrigeration system starts.
S102, timer 1 timing.
S103, judges whether the time arrives Δ T
1.If so, step S104 is performed; If not, then step S102 is performed.After compressor start, first throttle element is at first by setting value Δ T
1it within=20 minutes, is compressor oil return.
S104, opens first throttle element, is compressor oil return.
S105, timer 2 timing.
S106, judges whether the time of timer 2 arrives Δ T
2.If so, step S107 is performed; If not, then step S105 is performed.First throttle element first time runs Δ T
2it within=3 minutes, is compressor oil return.
S107, closes first throttle element.
S108, timer 2 resets.
S109, judges whether system start-up time reaches the first scheduled time t.If so, step S110 is performed; If not, then step S102 is performed.
S110, opens second section fluid element, obtains the temperature that two temperature-detecting devices detect, and obtains the temperature difference Δ T between two temperature.
S111, accumulated running time resets.
S112, judges whether Δ T is greater than A.If so, step S113 is performed; If not, then step S120 is performed.
S113, oil starvation counting increase by 1 time.
S114, oil starvation number of times does not reset.
S115, opens first throttle element, is compressor oil return.
S116, judges whether compressor oil starvation number of times is twice.If so, step S117 is performed; If not, then step S118 is performed.
S117, Δ T
1reduce very first time value t
1, Δ T
2be extended for 5 minutes, by the time interval Δ T that first throttle element is opened
1shorten 5 minutes, opening time Δ T
2be extended for 5 minutes, be embodied as compressor oil return as required.
S118, judges whether oil starvation number of times is 3 times.If so, step S119 is performed; If not, then step S102 is performed.
S119, stopping alarm, prevents compressor from burning out because operating continuously under oil starvation state.
S120, oil starvation counting does not add 1 time.
S121, oil starvation number of times resets.
S122, judges whether oil starvation is not 4 times.If so, step S123 is performed; If not, step S102 is performed.
S123, Δ T
1increase by the second time interval t
2, then return and perform step S102.Compressor continuous 4 times not oil starvation can judge that it is working properly, by the opening time interval delta T of first throttle element
1extend 5 minutes, thus reduce oil return running number of times, save electric energy.
According to a preferred embodiment of the invention, detect the temperature at second section fluid element two ends by two temperature-detecting devices and the difference of two temperatures and setting value are compared, when temperature difference is greater than setting value, controller controls first throttle element, thus be compressor oil return by first throttle element, and then guarantee that compressor can normally work.
Further, when detection path double judgement compressor oil starvation, the opening time interval of first throttle element is shortened, open and increase running time, thus under the duty be in compared with oil starvation at compressor, increase the recirculating oil quantity of compressor, realize the oil return as required to compressor.Further, when compressor normally run continuously and the temperature difference that detects of detection path is continuous be less than setting value four times time, the opening time interval of first throttle element is increased, thus when the normal oil return of compressor, reduces oil return running number of times, and then economize energy.And when continuous three the judgement compressor oil starvations of detection path, close compressor, realizes the early warning protection of the long-term oil starvation of compressor, prevent compressor from burning because of long-term oil starvation running.Therefore, the refrigeration system of the embodiment of the present invention can automatic decision compressor whether oil starvation, realizes oil return as required; system oil return running number of times can not only be reduced; save electric energy, and the early warning protection of the long-term oil starvation of compressor can be realized, prevent compressor from burning because of oil starvation running.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (9)
1. a refrigeration system, is characterized in that, comprising:
Compressor, described compressor has exhaust outlet and gas returning port, and the bottom of the sidewall of described compressor is provided with oil mass and detects mouth, and described oil mass detects between mouth and described gas returning port and is connected with detection path;
Oil eliminator, described oil eliminator has entrance and oil return opening, and described entrance is connected with described exhaust outlet, is in series with to have reducing pressure by regulating flow effect and for regulating the first throttle element of flow of lubrication between described oil return opening and described gas returning port;
There is reducing pressure by regulating flow effect and for regulating the second section fluid element of fluid flow, described second section fluid element is connected in described detection path;
Two temperature-detecting devices, described two temperature-detecting devices are respectively used to the temperature of the fluid at the two ends detecting described second section fluid element, when temperature difference △ T between the temperature that second section fluid element is opened and described two temperature-detecting devices detect is greater than setting value, described first throttle element is opened.
2. refrigeration system according to claim 1, is characterized in that, described second section fluid element comprises the capillary and control valve that are connected in series.
3. refrigeration system according to claim 1, is characterized in that, described second section fluid element is electric expansion valve.
4. refrigeration system according to claim 1, is characterized in that, described first throttle element is the capillary and magnetic valve that are connected in series.
5. refrigeration system according to claim 1, is characterized in that, after described compressor start first scheduled time, open described second section fluid element, and described two temperature-detecting device detected temperatures are to obtain temperature difference △ T.
6. refrigeration system according to claim 1, it is characterized in that, when described temperature difference △ T is greater than described setting value twice continuously, then the opening time interval of described first throttle element reduces very first time value, and the opening time interval of described first throttle element is not less than the second time value.
7. refrigeration system according to claim 6, is characterized in that, when the opening time interval of described first throttle element is shortened, the unlatching of described first throttle element increases running time.
8. refrigeration system according to claim 6, is characterized in that, when described temperature difference △ T is greater than described setting value three times continuously, described compressor cuts out.
9. refrigeration system according to claim 1, is characterized in that, when described temperature difference △ T is less than described setting value four times continuously, the opening time interval of described first throttle element increased for second time interval.
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| CN201510149802.3A CN104764253A (en) | 2015-03-31 | 2015-03-31 | Refrigerating system |
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| CN201510149802.3A CN104764253A (en) | 2015-03-31 | 2015-03-31 | Refrigerating system |
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| CN110542255A (en) * | 2019-09-06 | 2019-12-06 | 珠海格力电器股份有限公司 | compressor oil return method, refrigeration system and air conditioner |
| CN113498467A (en) * | 2019-02-28 | 2021-10-12 | 三菱电机株式会社 | Refrigeration cycle device |
| CN113587388A (en) * | 2021-07-20 | 2021-11-02 | 青岛海信日立空调***有限公司 | Multi-split air conditioner and multi-split air conditioner system |
| WO2023024673A1 (en) * | 2021-08-26 | 2023-03-02 | 浙江吉利控股集团有限公司 | Apparatus and method for preventing compressor from oil shortage and integrated gas-liquid separator |
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