CN103512280A - Oil balance method for air conditioner - Google Patents
Oil balance method for air conditioner Download PDFInfo
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- CN103512280A CN103512280A CN201310134533.4A CN201310134533A CN103512280A CN 103512280 A CN103512280 A CN 103512280A CN 201310134533 A CN201310134533 A CN 201310134533A CN 103512280 A CN103512280 A CN 103512280A
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Abstract
The invention discloses an oil balance method for an air conditioner. The air conditioner comprises at least two compressors in parallel and an oil separator. Each compressor is provided with an oil balance pipe connected with an inlet of the oil separator. An exhaust port and an air inlet of each compressor are connected with the inlet and a second outlet of the oil separator respectively. The oil balance method comprises the following steps: step 1, the state of fluid in the oil balance pipe of each compressor is detected; step 2, when the fluid in the oil balance pipe of one compressor is lubricating oil and the fluid in the oil balance pipe of the other compressor is gas or a gas-oil mixture according to the detection in the step 1, the oil separator is controlled to supply oil to the compressor containing the gas or the gas-oil mixture and stop supplying oil to the compressor containing the lubricating oil. According to the oil balance method for the air conditioner, the oil level of the lubricating oil in each compressor is guaranteed, the phenomenon that the oil levels of the compressors in parallel are unbalanced is avoided, and therefore the service life of the compressors and the service life of the air conditioner are prolonged.
Description
Technical field
The present invention relates to oily balancing technique field, especially relate to a kind of oily balance method of air-conditioner.
Background technology
In recent years, along with improving constantly of air conditioner energy saving grade and constantly popularizing of converter technique, frequency conversion rotor compressor more and more appears on light-duty commercialization and commercial air conditioning system, with its relatively low processing cost, relatively wide frequency range, possesses the ability that substitutes traditional digital vortex machine and frequency-changing cyclone machine.
But middle-size and small-size business air conditioner field, often take VRF Air Conditioning System as main, an outdoor unit the inside has 2 or above compressor parallel conventionally.When actual motion, because pipeline between two compressors is different in size, or work when different, may occur that the inner pasta of the first compressor is too high, and the inner pasta of the second compressor is too low, cannot guarantee the lubricated of moving component.If now compressor inside and system are not taked any control measure on controlling, the second compressor pasta of oil starvation cannot return to normal pasta position, and even compressor is stuck will to occur at short notice wearing and tearing kinematic pair.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art.For this reason, one object of the present invention is to propose a kind of oily balance method of avoiding at least two compressors in parallel to occur the unbalanced air-conditioner of pasta.
According to the oily balance method of the air-conditioner of the embodiment of the present invention, described air-conditioner comprises at least two compressors in parallel and oil eliminator, described oil eliminator comprises entrance, the first outlet and the second outlet, described in each, compressor is provided with the oil balance tube being connected with the entrance of described oil eliminator, the exhaust outlet of described compressor is connected with the second outlet with the entrance of described oil eliminator respectively with air inlet, wherein, described oily balance method comprises the steps: S1: detect the fluid state in the described oil balance tube of compressor described in each; S2: the fluid detecting in step S1 in the described oil balance tube of one of them compressor is lubricating oil, and when fluid in the described oil balance tube of another compressor being detected and being gas or gas mixture, control described oil eliminator to described another compressor oil-supplying and stop to a described compressor oil-supplying.
According to the oily balance method of the air-conditioner of the embodiment of the present invention, by detect fluid state in the oil balance tube of each compressor with the fuel head that judges the lubricating oil in corresponding compressor whether higher than predetermined altitude, the fuel head of the lubricating oil of one at least two compressors being detected is higher than predetermined altitude, and the fuel head of another lubricating oil is during lower than predetermined altitude, should be drained in oil eliminator higher than the lubricating oil of predetermined altitude part, and from oil eliminator, be drained in the compressor of oil starvation, thereby guaranteed the fuel head of the lubricating oil in each compressor, avoid occurring the unbalanced phenomenon of pasta between compressor in parallel, improved the service life of compressor and air-conditioner.
In addition, according to the oily balance method of air-conditioner of the present invention, also there is following additional technical feature:
In one embodiment of the invention, described step S1 comprises: S11a: detect the resistivity r of the fluid in oil balance tube described in each, and by the absolute value of the difference of the resistivity r0 of the described resistivity r detecting and lubricating oil | △ r| and predetermined difference value △ rk compare; S12a: when | during △ r|≤△ rk, the fluid in described oil balance tube is lubricating oil; When | during △ r| > △ rk, the fluid in described oil balance tube is gas or gas mixture.
Particularly, by detecting the resistivity of fluid in the second exit of described oil eliminator, obtain the resistivity r0 of described lubricating oil.
In another embodiment of the present invention, described step S1 comprises: S11b: detect the temperature value T1 of the fluid in oil balance tube described in each, and by the absolute value of the difference of the temperature value T0 of the described temperature value T1 detecting and gas | △ T| and predetermined difference value △ TK compare; S12b: when | during △ T| >=△ TK, the fluid in described oil balance tube is lubricating oil; When | during △ T| < △ TK, the fluid in described oil balance tube is gas or gas mixture, wherein, by detecting the temperature of the fluid of the exhaust ports of compressor described in each, obtains described temperature value T0.
In an example of the present invention, the temperature gap of the fluid flowing out by described the first outlet and described second outlet of more described oil eliminator obtains predetermined difference value △ TK.
In another embodiment of the present invention, described step S1 comprises: S11c: detect the temperature value t1 of the fluid in oil balance tube described in each, and by the absolute value of the difference of the temperature value t0 of the described temperature value t1 detecting and gas | △ t| and predetermined value △ tk compare; S12c: when | during △ t| >=△ tk, the fluid in described oil balance tube is lubricating oil; When | during △ t| < △ tk, the fluid in described oil balance tube is gas or gas mixture, wherein, by detecting the temperature of fluid of the porch of described oil eliminator, obtains described temperature value t0.
According to some embodiments of the present invention, described in each, between second of the air inlet of compressor and described oil eliminator the outlet, be provided with valve, by controlling the switch of described valve, whether control described oil eliminator to described compressor oil-supplying.
In some embodiments of the invention, described in each, between the described oil balance tube of compressor and the entrance of described oil eliminator, be provided with at described oil balance tube the check valve towards the entrance of oil balance tube described in the Way in one-way conduction of described oil eliminator and described oil eliminator.Thereby the gas that can avoid discharging in the oil balance tube of compressor of oil starvation enters in the oil balance tube of compressor of rich oil in parallel with it, guaranteed the stability of air-conditioner.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:
Fig. 1 is according to the flow chart of the oily balance method of the air-conditioner of inventive embodiments;
Fig. 2 is the schematic diagram of air-conditioner according to an embodiment of the invention;
Fig. 3 is the flow chart of the oily balance method of the air-conditioner shown in Fig. 3;
Fig. 4 is the schematic diagram of air-conditioner in accordance with another embodiment of the present invention;
Fig. 5 is the flow chart of the oily balance method of the air-conditioner shown in Fig. 4;
Fig. 6 is the schematic diagram of the air-conditioner of another embodiment according to the present invention;
Fig. 7 is the flow chart of the oily balance method of the air-conditioner shown in Fig. 6;
Fig. 8 is according to the schematic diagram of the compressor in the air-conditioner of the embodiment of the present invention;
Fig. 9 is the schematic diagram of the cylinder in the compressor shown in Fig. 8;
Figure 10 is the profile of A-A direction in Fig. 9;
Figure 11 is the schematic diagram of the cylinder that is equipped with piston and slide plate in the compressor shown in Fig. 8, and wherein the first end plate is provided with the second through hole;
Figure 12 is the profile of B-B direction in Figure 11;
Figure 13 is the profile of the cylinder that is equipped with piston and slide plate in the compressor shown in Fig. 8, and wherein the second end plate is provided with the second through hole.
Reference numeral:
Air-conditioner 100, condenser 1, evaporimeter 2, oil eliminator 3, entrance 30,
First outlet the 31, second outlet 32, compressor 4, the first compressor 4a,
The second compressor 4b, oil balance tube 40, housing 42, exhaust outlet 420, air inlet 421,
Cylinder 41, the first cylinder 41a, the second cylinder 41b, vane slot 410, the first through hole 411,
The second through hole 412, third through-hole 413, the first end plate 414, the second end plate 415, piston 43,
The second sensor 7, the 3rd sensor 8a, 8b, the 3rd pipeline 16, four-sensor 9,
The 4th pipeline 17, the 5th sensor 10, check valve 11, expansion valve 12, oil return capillary 13
The specific embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " be only for describing object, and can not be interpreted as indication or hint relative importance.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.In addition,, in description of the invention, except as otherwise noted, the implication of " a plurality of " is two or more.
Below with reference to Fig. 1-Figure 13, describe according to the air-conditioner 100 of the embodiment of the present invention and the oily balance method of this air-conditioner 100.
Air-conditioner 100 according to the embodiment of the present invention, as shown in Fig. 2, Fig. 4, Fig. 6 and Fig. 8, comprising: condenser 1, evaporimeter 2, oil eliminator 3, at least two compressors 4, wherein, evaporimeter 2 is connected with condenser 1.Oil eliminator 3 comprises that entrance 30, first outlet the 31 and second outlet 32, the first outlets 31 are communicated with condenser 1.The exhaust outlet 420 of each compressor 4 is connected with the entrance 30 of oil eliminator 3, the air inlet 421 of each compressor 4 is connected with evaporimeter 2 with the second outlet 32 of oil eliminator 3 respectively, and each compressor 4 is provided with the oil balance tube 40 being communicated with the entrance 30 of oil eliminator 3, the fuel head of the lubricating oil when fuel head of the lubricating oil in a compressor 4 at least two compressors 4 surpasses predetermined altitude and in another compressor 4 of at least two compressors 4 is during lower than predetermined altitude, the parts of lubricating oil that surpasses predetermined altitude in a described compressor 4 enters in oil eliminator 3 by oil balance tube 40, and the parts of lubricating oil in oil eliminator 3 enters in described another compressor 4.Wherein, air-conditioner 100 also comprises the elements such as electric-controlled box, and the operation principle of air-conditioner 100 etc. has been known by those skilled in the art, is not just described in detail here.
It should be noted that, in air-conditioner 100 below, the situation that comprises two compressors in parallel 4 in this air-conditioner 100 has only been described, but what be worth understanding is, when compressor 4 is when more than two, the principle of the oily balance method of the air-conditioner 100 when the principle of the oily balance method of air-conditioner 100 is two with compressor 4 is identical.
Particularly, two compressors 4 are respectively the first compressor 4a and the second compressor 4b in parallel, the oil balance tube 40 of the first compressor 4a and the first compressor 4a internal communication, the oil balance tube 40 of the second compressor 4b and the second compressor 4b internal communication.The exhaust outlet 420 of the first compressor 4a is connected with the entrance 30 of oil eliminator 3 respectively with the exhaust outlet 420 of the second compressor 4b, the air inlet 421 of the first compressor 4a is connected with the second outlet 32 of oil eliminator 3 respectively with the air inlet 421 of the second compressor 4b, the air inlet 421 of the first compressor 4a and the air inlet 421 of the second compressor 4b are connected with evaporimeter 2 respectively simultaneously, the oil balance tube 40 of the first compressor 4a is connected with the entrance 30 of oil eliminator 3 respectively with the oil balance tube 40 of the second compressor 4b, the first outlet 31 of oil eliminator 3 is connected with condenser 1, condenser 1 is connected with evaporimeter 2, the second outlet 32 places of oil eliminator 3 are also provided with oil return capillary 13, between condenser 1 and evaporimeter 2, be provided with expansion valve 12.
During air-conditioner 100 refrigeration work, the oil-containing gases at high pressure that the first compressor 4a and the second compressor 4b discharge enter into and in oil eliminator 3, carry out Oil-gas Separation, gases at high pressure after separation enter into condenser 1 and carry out condensation from the first outlet 31 of oil eliminator 3, by expansion valve 12 reducing pressure by regulating flows, low pressure liquid refrigerant enters evaporimeter 2 to carry out after sweat cooling, and low-pressure gas is got back to the reservoir side of corresponding the first compressor 4a and the second compressor 4b.The lubricating oil that oil eliminator 3 is separated is deposited on the bottom of oil eliminator 3, this lubricating oil is discharged from the second outlet 32 of oil eliminator 3, by entering into the air inlet 421 of corresponding the first compressor 4a and the second compressor 4b after oil return capillary 13 reducing pressure by regulating flows, the reservoir side that lubricating oil is got back to corresponding the first compressor 4a and the second compressor 4b along with low-pressure gas, thus and by corresponding the first compressor 4a and the second compressor 4b suction, got back to corresponding compressor 4 inside in breathing process.
In the process of air-conditioner 100 work, the fuel head of the lubricating oil in the first compressor 4a being detected surpasses predetermined altitude, i.e. rich oil in the first compressor 4a, and the fuel head of the lubricating oil in the second compressor 4b detected lower than predetermined altitude, during the second compressor 4b inner oil shortage, the parts of lubricating oil that surpasses predetermined altitude in the first compressor 4a enters in oil eliminator 3 by the oil balance tube 40 of the first compressor 4a, this parts of lubricating oil entering in oil eliminator 3 can enter in the second compressor 4b, thereby guarantee the fuel head in the first compressor 4a and the second compressor 4b.In other words, in the process of air-conditioner 100 work, whether the fuel head that ceaselessly detects the lubricating oil in the first compressor 4a and the second compressor 4b surpasses predetermined altitude, when as long as the fuel head of the lubricating oil of one of them in the first compressor 4a and the second compressor 4b surpasses predetermined altitude, the lubricating oil that should surpass predetermined altitude just enters in oil eliminator 3 and from oil eliminator 3, is discharged in the compressor 4 of oil starvation.Wherein, can adopt the fuel head that detects in any way the lubricating oil in the first compressor 4a and the second compressor 4b, and specifically set predetermined altitude according to the actual conditions of compressor 4 operations.
According to the air-conditioner 100 of the embodiment of the present invention, by be provided with the oil balance tube 40 being communicated with the entrance 30 of oil eliminator 3 on each compressor 4, the fuel head of the lubricating oil of one at least two compressors 4 being detected is higher than predetermined altitude, and the fuel head of another lubricating oil is during lower than predetermined altitude, should be drained in oil eliminator 3 higher than the lubricating oil of predetermined altitude part, and from oil eliminator 3, be drained in the compressor 4 of oil starvation, thereby guaranteed the fuel head of the lubricating oil in each compressor 4, avoid occurring the unbalanced phenomenon of pasta between compressor 4 in parallel, improved the service life of compressor 4 and air-conditioner 100.
Oily balance method according to the air-conditioner 100 of the embodiment of the present invention, as shown in Figure 1, comprises the steps:
S1: detect the fluid state in the oil balance tube 40 of each compressor 4.
S2: the fluid detecting in step S1 in the oil balance tube 40 of one of them compressor 4 is lubricating oil, and when fluid in the oil balance tube 40 of another compressor 4 being detected and being gas or gas mixture, control oil eliminator 3 to described another compressor 4 fuel feeding and stop to described compressor 4 fuel feeding.
Particularly, detect the fluid state in the oil balance tube 40 of the first compressor 4a and in the oil balance tube 40 of the second compressor 4b, fluid in the oil balance tube 40 that the first compressor 4a detected is lubricating oil, and when fluid in the oil balance tube 40 of the second compressor 4b being detected and being gas or gas mixture, now show the first compressor 4a rich oil and the second compressor 4b oil starvation, the fuel head of the lubricating oil in the first compressor 4a is higher than predetermined altitude, should flow in oil balance tube 40 higher than the lubricating oil of predetermined altitude, the fuel head of the lubricating oil in the second compressor 4b is lower than predetermined altitude, the fluid entering in oil balance tube 40 is gas or gas mixture, lubricating oil in the oil balance tube 40 of the first compressor 4a enters in oil eliminator 3 and is drained in the second compressor 4b from oil eliminator 3.
According to the oily balance method of the air-conditioner of the embodiment of the present invention, by detect fluid state in the oil balance tube 40 of each compressor 4 with the fuel head that judges the lubricating oil in corresponding compressor 4 whether higher than predetermined altitude, the fuel head of the lubricating oil of one at least two compressors 4 being detected is higher than predetermined altitude, and the fuel head of another lubricating oil is during lower than predetermined altitude, should be drained in oil eliminator 3 higher than the lubricating oil of predetermined altitude part, and from oil eliminator 3, be drained in the compressor 4 of oil starvation, thereby guaranteed the fuel head of the lubricating oil in each compressor 4, avoid occurring the unbalanced phenomenon of pasta between compressor 4 in parallel, improved the service life of compressor 4 and air-conditioner 100.
According to some embodiments of the present invention, as shown in Fig. 8-Figure 13, each compressor 4 comprises: housing 42, cylinder 41, piston 43 and slide plate 44, wherein, lubricating oil is contained in the inner bottom part of housing 42.Cylinder 41 is located in housing 42, in cylinder 41, be provided with vane slot 410, first passage and second channel, first passage is with vane slot 410 and housing 42 is interior is communicated with, second channel is communicated with vane slot 410, and oil balance tube 40 one end is communicated with second channel and the other end stretches out housing 42 and is communicated with the entrance 30 of oil eliminator 3.Piston 43 is eccentric to be located in cylinder 41 rotationally.Slide plate 44 is located in vane slot 410 slidably and slide plate 44 one end is only against on piston 43.Be worth understanding, each compressor 4 also comprises the elements such as base bearing, bent axle, supplementary bearing, by those skilled in the art, has been known, and is not just described in detail here.Thereby make compressor 4 simple in structure.
In other words, piston 43 carries out eccentric rotary motion in cylinder 41, piston 43 drives slide plate 44 to carry out linear reciprocating motion in the vane slot 410 of cylinder 41 while rotating, the space that first passage and vane slot 410 limit is slide plate chamber back, along with the linear reciprocating motion of slide plate 44, the space of slide plate chamber back exists and does not suspend contracting and expansion.When the fuel head of the lubricating oil of compressor 4 inside surpasses the height of entrance of first passage, be that whole slide plate chamber back is all immersed in lubricating oil, when slide plate chamber back is expanded, lubricating oil enters slide plate chamber back by the entrance along first passage, when the space contraction of slide plate chamber back, lubricating oil will be drained in oil balance tube 40 from second channel, and last lubricating oil enters in oil eliminator 3.Wherein, lubricating oil can be drained in oil balance tube 40 from second channel when guaranteeing that slide plate chamber back is shunk, rather than return in housing 42 from the entrance adverse current of first passage, guarantee that in design the size of the entrance of first passage is less than the size of the outlet of second channel.The fuel head of the lubricating oil in compressor 4 is during lower than the height of the entrance of first passage, lubricating oil cannot enter in slide plate chamber back, now the gases at high pressure of housing 42 inside enter slide plate chamber back and enter in oil balance tube 40 by second channel, finally from oil balance tube 40, are drained in oil eliminator 3.
In an example of the present invention, as shown in Fig. 9-Figure 12, cylinder 41 is provided with the first through hole 411 that in the vertical direction runs through it, the first through hole 411 top and bottom are respectively equipped with the first end plate 414 and the second end plate 415, the first end plate 414 is provided with the second through hole 412 being communicated with the first through hole 411, the first through hole 411 and the second through hole 412 limit first passage, and the sidewall of cylinder 41 is provided with third through-hole 413, and third through-hole 413 and the first through hole 411 limit second channel.In other words, the first through hole 411 runs through cylinder 41 on vertical, and the first through hole 411 top is provided with the first end plate 414, the bottom of the first through hole 411 is provided with the second end plate 415, now, the first end plate 414, the second end plate 415 and slide plate 44 jointly enclose by the first through hole 411 on cylinder 41 and vane slot 410 space forming and are called slide plate chamber back, and the first end plate 414 is provided with the second through hole 412 being communicated with the first through hole 411, and slide plate chamber back is communicated with housing 42 inner spaces.Thereby make cylinder 41 simple in structure.Wherein, in of the present invention example, compressor 4 can be single cylinder compressor and also can be duplex cylinder compressor.Wherein, lubricating oil can be drained in oil balance tube 40 from third through-hole 413 when guaranteeing that slide plate chamber back is shunk, and the diameter d 1 of the second through hole 412 is less than the diameter d 2 of third through-hole 413.
In another example of the present invention, as shown in Fig. 8 and Figure 13, cylinder 41 is two and comprises the first cylinder 41a and the second cylinder 41b, the first cylinder 41a is located at the top of the second cylinder 41b, the first cylinder 41a is provided with the first through hole 411 that in the vertical direction runs through it, the first through hole 411 top and bottom are respectively equipped with the first end plate 414 and the second end plate 415, the first end plate 414 or the second end plate 415 are provided with the second through hole 412 being communicated with the first through hole 411, the first through hole 411 and the second through hole 412 limit first passage, the sidewall of the first cylinder 41a is provided with third through-hole 413, third through-hole 413 and the first through hole 411 limit second channel.Wherein, lubricating oil can be drained in oil balance tube 40 from third through-hole 413 when guaranteeing that slide plate chamber back is shunk, and the diameter d 1 of the second through hole 412 is less than the diameter d 2 of third through-hole 413.In other words, in example of the present invention, compressor 4 is duplex cylinder compressor.
According to some embodiments of the present invention, as shown in Fig. 2, Fig. 4, Fig. 6 and Fig. 8, air-conditioner 100 also comprises at least two valves 5, and each valve 5 is located on the first pipeline 14 between the air inlet 421 of each compressor 4 and the second outlet 32 of oil eliminator 3.In other words, between the second outlet 32 of the air inlet 421 of each compressor 4 and oil eliminator 3, be provided with valve 5, by the switch of by-pass valve control 5, whether control oil eliminator 3 to compressor 4 fuel feeding.Now, in the process of air-conditioner 100 operations, the fuel head of the lubricating oil in detecting the first compressor 4a is higher than predetermined altitude, fuel head in the second compressor 4b is during lower than predetermined altitude, i.e. the first compressor 4a rich oil, during the second compressor 4b oil starvation, the valve 5 of controlling between the air inlet 421 of the first compressor 4a and the second outlet 32 of oil eliminator 3 is closed, valve 5 between the second outlet 32 of the air inlet 421 of the second compressor 4b and oil eliminator 3 is opened, with the second compressor 4b fuel feeding to oil starvation and stop the first compressor 4a fuel feeding to rich oil, guaranteed the fuel head of the lubricating oil in the first compressor 4a and the second compressor 4b.
As shown in Fig. 2, Fig. 4 and Fig. 6, air-conditioner 100 also comprises at least two check valves 11, each check valve 11 at the oil balance tube 40 along each compressor 4 towards the entrance 30 direction one-way conduction oil balance tubes 40 of oil eliminator 3 and the entrance 30 of oil eliminator 3.In other words, between the oil balance tube 40 of each compressor 4 and the entrance 30 of oil eliminator 3, be provided with the check valve 11 towards the entrance 30 direction one-way conduction oil balance tubes 40 of oil eliminator 3 and the entrance 30 of oil eliminator 3 at oil balance tube 40.Thereby the gas of oil balance tube 40 interior discharges that can avoid the compressor 4 of oil starvation enters in the oil balance tube 40 of compressor 4 of rich oil in parallel with it, guaranteed the stability of air-conditioner 100.
Below with reference to Fig. 1-Figure 13, describe air-conditioner 100 and the oily balance method thereof of three different embodiment according to the present invention, second through hole 412 of wherein take is located at the first end plate 414 and air-conditioner 100 and comprises that two compressors 4 describe as example.
Embodiment 1:
As shown in Figures 2 and 3, in an embodiment of the present invention, air-conditioner 100 comprises two first sensor 6a, 6b and second sensor 7, each first sensor is located on the second pipeline 15 between the oil balance tube 40 of each compressor 4 and the entrance 30 of oil eliminator 3 for detection of the fluid state in the second pipeline 15, and the second outlet 32 of the second sensor 7 contiguous oil eliminators 3 arranges to detect the fluid state flowing out from the second outlet 32.In other words, first sensor 6a is located on the second pipeline 15 between the oil balance tube 40 of the first compressor 4a and the entrance 30 of oil eliminator 3, first sensor 6b is located on the second pipeline 15 between the oil balance tube 40 of the second compressor 4b and the entrance 30 of oil eliminator 3, and first sensor 6a and first sensor 6b are for detection of fluid state interior on corresponding the second pipeline 15.
The interior three kinds of fluids that may exist of the oil balance tube 40 of the first compressor 4a and the oil balance tube 40 of the second compressor 4b are lubricating oil, gas mixture or gas, the resistivity of three kinds of fluids is different, and only may have wherein a kind of fluid form at a time.Can be by detecting the changing value of the resistivity of the fluid in every oil balance tube 40, the fluid that can tell oil balance tube 40 inside in a certain moment is lubricating oil, gas or gas mixture.
Now, in an embodiment of the present invention, the step S1 in the oily balance method of air-conditioner 100 comprises:
S11a: detect the resistivity r of the fluid in each oil balance tube 40, and by the absolute value of the difference of the resistivity r0 of the resistivity r detecting and lubricating oil | △ r| and predetermined difference value △ rk compare.Particularly, obtain the resistivity r0 of lubricating oil by detecting the second resistivity that exports the fluid at 32 places of oil eliminator 3, predetermined difference value △ rk draws according to experiment.
S12a: when | during △ r|≤△ rk, the fluid in oil balance tube 40 is lubricating oil; When | during △ r| > △ rk, the fluid in oil balance tube 40 is gas or gas mixture.
The second sensor 7 inductions are from the resistivity r0 of oil eliminator 3 bottoms lubricating oil out, first sensor 6a on the second pipeline 15 between the first compressor 4a and oil eliminator 3 responds to the resistivity r1 of oil balance tube 40 inner fluids of the first compressor 4a, and the first sensor 6b on the second pipeline 15 between the second compressor 4b and oil eliminator 3 responds to the resistivity r2 of the fluid in the oil balance tube 40 of the second compressor 4b.
That respond to all the time due to the second sensor 7 is the resistivity r0 of lubricating oil, as benchmark, first sensor 6a induces the resistivity r1 of oil balance tube 40 inner fluids of a certain moment the first compressor 4a, first sensor 6b responds to the resistivity r2 of oil balance tube 40 inner fluids of a certain moment the second compressor 4b, and calculates △ r1=r1-r0 and △ r2=r2-r0.If one of them oil balance tube 40 inner fluid is lubricating oil, fluid resistivity of the same race approaches therefore △ r1(or △ r2) absolute value | △ r1|(or | △ r2|) can fluctuation (actual data value of △ rk will be revised through overtesting) between 0 to △ rk, can judge that what in this constantly, on this oil balance tube 40, exist is lubricating oil, the fuel head of the lubricating oil in the compressor 4 corresponding with this oil balance tube 40 is higher than the first end plate 414, oil mass now has exceeded the instructions for use of compressor 4, unnecessary lubricating oil will be discharged and be entered oil eliminator 3 by oil balance tube 40.Simultaneously the control terminal of air-conditioner 100 receives first sensor 6a on the second pipeline 15 between the first compressor 4a and oil eliminator 3 or the judgement signal of the first sensor 6b on the second pipeline 15 between the second compressor 4b and oil eliminator 3, judge that the compressor 4 that this first sensor 6a or first sensor 6b monitor exists rich oil certainly, now can disconnect valve 5 between the first compressor 4a and oil eliminator 3 or the valve 5 between the second compressor 4b and oil eliminator 3 at once, oil eliminator 3 is ended to the lasting fuel feeding action of compressor 4 low-pressure sides of rich oil.By above oil extraction, move, the oil of compressor 4 inside of rich oil can only discharge and lose lasting oil return and supplement, and the pasta of compressor 4 inside drops to the first end plate 414 lower than cylinder 41.In the present embodiment, with the first end plate 414 place height faces for the highest pasta.
When the pasta of lubricating oil is down to the highest pasta when following, the fluid that enters the second through hole 412 of the first end plate 414 is gas, because the resistivity of gas is much larger than liquid, therefore △ r1(or △ r2) absolute value | △ r1|(or | △ r2|) will be greater than △ rk, what can judge these constantly interior oil balance tube 40 internal flows is gas, air-conditioner 100 control terminals judge that oil starvation may appear in the compressor 4 that this sensor is monitored, open valve 5 between the first compressor 4a and oil eliminator 3 or the valve 5 between the second compressor 4b and oil eliminator 3 at once, the oil that makes oil eliminator 3 bottoms is got back to after by reducing pressure by regulating flow in the reservoir of compressor 4 of oil starvation, and by cylinder 41 absorbing gas belts, be back to housing 42 inside of compressor 4, guarantee that pasta can sharply not drop to the minimum pasta of design following and make compressor 4 motion portions cannot form effectively lubricating, complete oil return action.In the present embodiment, minimum pasta is defined as and cannot makes motion portion form the lubricated pasta of effective fuel feeding.
When the pasta of lubricating oil fluctuates between minimum pasta and the highest pasta, also there will be oil droplet gaseous mixture to enter the second through hole 412 of the first end plate 414 simultaneously, thereby and enter oil balance tube 40 and distinguished by corresponding first sensor 6a or first sensor 6b, the fluid detecting in oil balance tube 4 is gas mixture.Now think that pasta can not continue to remain stable, the control terminal of air-conditioner 100 can be carried out oil starvation judgement equally, and this compressor 4 is carried out to oil return action.
Embodiment 2:
As shown in Fig. 4, Fig. 5 and Fig. 8, in an embodiment of the present invention, air-conditioner 100 comprises two first sensor 6a, 6b and second sensor 7, each first sensor is located on the second pipeline 15 between the oil balance tube 40 of each compressor 4 and the entrance 30 of oil eliminator 3 for detection of the fluid state in the second pipeline 15, and the second outlet 32 of the second sensor 7 contiguous oil eliminators 3 arranges to detect the fluid state flowing out from the second outlet 32.In other words, first sensor 6a is located on the second pipeline 15 between the oil balance tube 40 of the first compressor 4a and the entrance 30 of oil eliminator 3, first sensor 6b is located on the second pipeline 15 between the oil balance tube 40 of the second compressor 4b and the entrance 30 of oil eliminator 3, and first sensor 6a and first sensor 6b are for detection of fluid state interior on corresponding the second pipeline 15.
Air-conditioner 100 also comprises two the 3rd sensor 8a, 8b and a four-sensor 9, on the 3rd pipeline 16 of each the 3rd covers disposed on sensor between the exhaust outlet 420 of each compressor 4 and the entrance 30 of oil eliminator 3 for detection of the fluid state in the 3rd pipeline 16, four-sensor 9 be located at oil eliminator 3 first outlet 31 and condenser 1 between the 4th pipeline 17 on for detection of the fluid state on the 4th pipeline 17.In other words, the 3rd sensor 8a is located on the 3rd pipeline 16 between the exhaust outlet 420 of the first compressor 4a and the entrance 30 of oil eliminator 3, the 3rd sensor 8b is located on the 3rd pipeline 16 between the exhaust outlet 420 of the second compressor 4b and the entrance 30 of oil eliminator 3, and the 3rd sensor 8a and the 3rd sensor 8b are for detection of the fluid state on corresponding the 3rd pipeline 16.
Now, in an embodiment of the present invention, the step S1 in the oily balance method of air-conditioner 100 comprises:
S11b: detect the temperature value T1 of the fluid in each oil balance tube 40, and by the absolute value of the difference of the temperature value T0 of the temperature value T1 detecting and gas | △ T| and predetermined difference value △ TK compare.Particularly, the temperature gap by the fluids that relatively first outlet the 31 and second outlet 32 of oil eliminator 3 is flowed out obtains predetermined difference value △ TK, by detecting the temperature of fluid at exhaust outlet 420 places of each compressor 4, obtains temperature value T0.
S12b: when | during △ T| >=△ TK, the fluid in oil balance tube 40 is lubricating oil; When | during △ T| < △ TK, the fluid in oil balance tube 40 is gas or gas mixture.
Particularly, the fluid temperature (F.T.) that first sensor 6a detects in the oil balance tube 40 of the first compressor 4a is T1a, the fluid temperature (F.T.) that first sensor 6b detects in the oil balance tube 40 of the second compressor 4b is T1b, the 3rd sensor 8a detects the temperature T 0a of the fluid in the 3rd pipeline 16 between the exhaust outlet 420 of the first compressor 4a and the entrance 30 of oil eliminator 3, the 3rd sensor 8b detects the temperature T 0b of the fluid in the 3rd pipeline 16 between the exhaust outlet 420 of the second compressor 4b and the entrance 30 of oil eliminator 3, the gas temperature T2 of oil eliminator 3 is discharged in four-sensor 9 inductions, the temperature T 3 of the lubricating oil of oil eliminator 3 is discharged in the second sensor 7 inductions, because the form of the fluid in four-sensor 9 and second sensor 7 these two points for measuring temperature is stable, it is the gaseous fluid that is always that first of oil eliminator 3 exports 31 discharges, second of oil eliminator 3 exports the lubricating oil that is always of 32 discharges, the temperature difference of its T2 and T3 is predetermined difference value △ TK, and predetermined difference value △ TK is substantially constant when air-conditioner 100 operating modes are stablized.Simultaneously due to what the exhaust outlet 420 of each compressor 4 was discharged, be always gas mixture, the temperature T 0b that the temperature T 0a that the 3rd sensor 8b detects and the 3rd sensor 8b detect is substantially constant.And the oil balance tube 40 of each compressor 4 is interior, may exist three kinds of fluids for oil, gas mixture or gas, and only may have wherein a kind of fluid form at a time, may there is not variation in oil balance tube 40 inner fluid states in the same time.
Difference △ Ta between the temperature T 0a that the temperature T 1a that first sensor 6a detects and the 3rd sensor 8a detect can change along with the variation of the fluid form in the oil balance tube 40 of the first compressor 4a, difference △ Tb between the temperature T 0b that the temperature T 1b that first sensor 6b detects and the 3rd sensor 8b detect can change along with the variation of the fluid form in the oil balance tube 40 of the second compressor 4b, because the variations in temperature of gas is faster than the variations in temperature of lubricating oil, when appearance | △ Ta| >=△ TK or | during △ Tb| >=△ TK, show that fluid in the oil balance tube 40 of the first compressor 4a is that fluid in the oil balance tube 40 of lubricating oil or the second compressor 4b is lubricating oil, now air-conditioner 100 control terminals are judged rich oil in the first compressor 4a or in the second compressor 4b, need to carry out oil extraction action.When if the fluid in the oil balance tube 40 of the oil balance tube 40 of the first compressor 4a or the second compressor 4b is gas or gas mixture, T1a ≈ T0a or T1b ≈ T0b, | △ Tb| < △ TK or | △ Ta| < △ TK, now air-conditioner 100 control terminals are judged in the first compressor 4a or the second compressor 4b inner oil shortage, need to carry out oil return action.Wherein, be worth understanding, the running that the oil extraction action in the present embodiment is moved with oil return is identical with the running of the oil extraction action in embodiment 1 and oil return action, is not just described in detail here.
Embodiment 3:
As shown in Figure 6 and Figure 7, air-conditioner 100 also comprises two first sensor 6a, 6b and the 5th sensor 10, each first sensor is located on the second pipeline 15 between the oil balance tube 40 of each compressor 4 and the entrance 30 of oil eliminator 3 for detection of the fluid state in the second pipeline 15, and the entrance 30 of the 5th sensor 10 contiguous oil eliminators 3 arranges to detect the fluid state that flows into oil eliminator 3.In other words, first sensor 6a is located on the second pipeline 15 between the oil balance tube 40 of the first compressor 4a and the entrance 30 of oil eliminator 3, first sensor 6b is located on the second pipeline 15 between the oil balance tube 40 of the second compressor 4b and the entrance 30 of oil eliminator 3, and first sensor 6a and first sensor 6b are for detection of fluid state interior on corresponding the second pipeline 15.
Wherein, in an embodiment of the present invention, the step S1 in the oily balance method of air-conditioner 100 comprises:
S11c: detect the temperature value t1 of the fluid in each oil balance tube 40, and by the absolute value of the difference of the temperature value t0 of the temperature value t1 detecting and gas | △ t| and predetermined value △ tk compare.Particularly, by detecting the first temperature that exports the fluid at 31 places of oil eliminator 3, obtain temperature value t0, predetermined value △ tk draws through overtesting.
S12c: when | during △ t| >=△ tk, the fluid in oil balance tube 40 is lubricating oil; When | during △ t| < △ tk, the fluid in oil balance tube 40 is gas or gas mixture.
Particularly, the 5th sensor 10 detects the gas temperature t0 discharging from the first outlet 31 of oil eliminator 3, first sensor 6a responds to the temperature t 1a of the fluid in the oil balance tube 40 of the first compressor 4a, and first sensor 6b responds to the temperature t 1b of the fluid in the oil balance tube 40 of the second compressor 4b.
Due to the gaseous fluid that is always of discharging from the first outlet 31 of oil eliminator 3, therefore the temperature value t0 detecting is substantially constant when air-conditioner 100 operating modes are stablized, as benchmark, and the interior three kinds of fluids that may exist of the oil balance tube 40 of each compressor 4 are oil, gas mixture or gas, and only may there is wherein a kind of fluid form at a time.Difference △ ta between the temperature t 0 that the temperature t 1a that first sensor 6a detects and the 5th sensor 10 detect can change along with the variation of the fluid form in the oil balance tube 40 of the first compressor 4a, difference △ tb between the temperature t 0 that the temperature t 1b that first sensor 6b detects and the 5th sensor 10 detect can change along with the variation of the fluid form in the oil balance tube 40 of the second compressor 4b, monitoring by temperature can calculate the difference △ ta of t1a-t0 in a certain moment and the difference △ tb of t1b-t0, when the absolute value of difference △ ta (or △ tb) | △ t| is more than or equal to the actual data value of predetermined difference value △ tk(△ tk and will revises through overtesting), show that fluid in the oil balance tube 40 of the first compressor 4a is that fluid in the oil balance tube 40 of lubricating oil or the second compressor 4b is lubricating oil, now air-conditioner 100 control terminals are judged rich oil in the first compressor 4a or the second compressor 4b, need to carry out oil extraction action.As difference △ ta(or △ tb) absolute value | △ t| is more than or equal to 0 and while being less than △ tk, show that the fluid in the oil balance tube 40 of the first compressor 4a or the oil balance tube 40 of the second compressor 4b is gas or gas mixture, now air-conditioner 100 control terminals are judged the first compressor 4a or the second compressor 4b inner oil shortage, need to carry out oil return action.Wherein, be worth understanding, the running that the oil extraction action in the present embodiment is moved with oil return is identical with the running of the oil extraction action in embodiment 1 and oil return action, is not just described in detail here.
What deserves to be explained is, in embodiment 1-embodiment 3, the fluid state that the fluid state that first sensor 6a detects and first sensor 6b detect can identical also can be different, in other words, fluid form in fluid form in the oil balance tube 40 of the first compressor 4a and the oil balance tube 40 of the second compressor 4b can identical also can be different, when the fluid in the oil balance tube 40 of the first compressor 4a is gas or gas mixture, fluid in the oil balance tube 40 of the second compressor 4a also can be gas or gas mixture, but what be worth understanding is, when the fluid in the oil balance tube 40 of the first compressor 4a is lubricating oil, fluid in the oil balance tube 40 of the second compressor 4b can only be gas or gas mixture, work as compressor 4 rich oils in two compressors 4, another compressor 4 is certainly in oil starvation state.
Wherein, what be worth understanding is, when the second through hole 412 is positioned on the second end plate 415, the second end plate 415 place height of the first cylinder 41a are defined as the highest pasta, minimum pasta is specifically set according to actual conditions, identical when now the principle of the structure of air-conditioner 100 and the oily balance method of air-conditioner 100 is positioned at the first end plate 414 with the second through hole 412, be not just described in detail here.
In the description of this description, the description of reference term " embodiment ", " some embodiment ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (8)
1. the oily balance method of an air-conditioner, it is characterized in that, described air-conditioner comprises at least two compressors in parallel and oil eliminator, described oil eliminator comprises entrance, the first outlet and the second outlet, described in each, compressor is provided with the oil balance tube being connected with the entrance of described oil eliminator, the exhaust outlet of described compressor is connected with the second outlet with the entrance of described oil eliminator respectively with air inlet
Wherein, described oily balance method comprises the steps:
S1: detect the fluid state in the described oil balance tube of compressor described in each;
S2: the fluid detecting in step S1 in the described oil balance tube of one of them compressor is lubricating oil, and when fluid in the described oil balance tube of another compressor being detected and being gas or gas mixture, control described oil eliminator to described another compressor oil-supplying and stop to a described compressor oil-supplying.
2. the oily balance method of air-conditioner according to claim 1, is characterized in that, described step S1 comprises:
S11a: detect the resistivity r of the fluid in oil balance tube described in each, and by the absolute value of the difference of the resistivity r0 of the described resistivity r detecting and lubricating oil | △ r| and predetermined difference value △ rk compare;
S12a: when | during △ r|≤△ rk, the fluid in described oil balance tube is lubricating oil; When | during △ r| > △ rk, the fluid in described oil balance tube is gas or gas mixture.
3. the oily balance method of air-conditioner according to claim 2, is characterized in that, obtains the resistivity r0 of described lubricating oil by detecting the resistivity of fluid in the second exit of described oil eliminator.
4. the oily balance method of air-conditioner according to claim 1, is characterized in that, described step S1 comprises:
S11b: detect the temperature value T1 of the fluid in oil balance tube described in each, and by the absolute value of the difference of the temperature value T0 of the described temperature value T1 detecting and gas | △ T| and predetermined difference value △ TK compare;
S12b: when | during △ T| >=△ TK, the fluid in described oil balance tube is lubricating oil; When | during △ T| < △ TK, the fluid in described oil balance tube is gas or gas mixture, wherein, by detecting the temperature of the fluid of the exhaust ports of compressor described in each, obtains described temperature value T0.
5. the oily balance method of air-conditioner according to claim 4, is characterized in that, the temperature gap of the fluid flowing out by described the first outlet and described second outlet of more described oil eliminator obtains predetermined difference value △ TK.
6. the oily balance method of air-conditioner according to claim 4, is characterized in that, described step S1 comprises:
S11c: detect the temperature value t1 of the fluid in oil balance tube described in each, and by the absolute value of the difference of the temperature value t0 of the described temperature value t1 detecting and gas | △ t| and predetermined value △ tk compare;
S12c: when | during △ t| >=△ tk, the fluid in described oil balance tube is lubricating oil; When | during △ t| < △ tk, the fluid in described oil balance tube is gas or gas mixture, wherein, by detecting the temperature of fluid in the first exit of described oil eliminator, obtains described temperature value t0.
7. the oily balance method of air-conditioner according to claim 1, it is characterized in that, described in each, between second of the air inlet of compressor and described oil eliminator the outlet, be provided with valve, by controlling the switch of described valve, whether control described oil eliminator to described compressor oil-supplying.
8. the oily balance method of air-conditioner according to claim 1, it is characterized in that, described in each, between the described oil balance tube of compressor and the entrance of described oil eliminator, be provided with the check valve towards the entrance of oil balance tube described in the Way in one-way conduction of described oil eliminator and described oil eliminator at described oil balance tube.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112781186A (en) * | 2019-11-05 | 2021-05-11 | 广东美的制冷设备有限公司 | Air conditioner control method, air conditioner and readable storage medium |
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