CN103512280B - The oily balance method of air-conditioner - Google Patents
The oily balance method of air-conditioner Download PDFInfo
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- CN103512280B CN103512280B CN201310134533.4A CN201310134533A CN103512280B CN 103512280 B CN103512280 B CN 103512280B CN 201310134533 A CN201310134533 A CN 201310134533A CN 103512280 B CN103512280 B CN 103512280B
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Abstract
The invention discloses a kind of oily balance method of air-conditioner, air-conditioner comprises at least two compressors in parallel and oil eliminator, each compressor is provided with the oil balance tube be connected with the entrance of oil eliminator, the exhaust outlet of compressor exports with the entrance and second of oil eliminator respectively with air inlet and is connected, wherein, oily balance method comprises the steps: S1: detect the fluid state in the oil balance tube of each compressor.S2: when detecting in step S1 that the fluid in the oil balance tube of one of them compressor is lubricating oil, and the fluid detecting in the oil balance tube of another compressor be gas or gas mixture time, controlling oil eliminator to another compressor oil-supplying stops to a compressor oil-supplying.According to the oily balance method of the air-conditioner of the embodiment of the present invention, ensure that the fuel head of the lubricating oil in each compressor, avoid occurring the unbalanced phenomenon of pasta between compressor in parallel, improve the service life of compressor and air-conditioner.
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 the processing cost that it is relatively low, relatively wide frequency range, possesses the ability of alternative conventional digital scroll machine and frequency-changing cyclone machine.
But, often based on VRF Air Conditioning System, there are 2 or more compressor parallels in middle-size and small-size business air conditioner field usually inside an outdoor unit.When actual motion, because between two compressors, pipeline is different in size, or asynchronously work, may occur that the inner pasta of the first compressor is too high, and the too low lubrication that cannot ensure moving component of the inner pasta of the second compressor.If now inner the and Systematical control of compressor does not take any control measure, the second compressor pasta of oil starvation cannot return to normal oil surface level, will occur that the kinematic pair even compressor that weares and teares is stuck at short notice.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, one object of the present invention is to propose a kind of oily balance method 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, each described compressor is provided with the oil balance tube be connected with the entrance of described oil eliminator, the exhaust outlet of described compressor exports with the entrance and second of described oil eliminator respectively with air inlet and is connected, wherein, described oily balance method comprises the steps: S1: detect the fluid state in the described oil balance tube of each described compressor; S2: when the fluid in the described oil balance tube one of them compressor being detected in step S1 is lubricating oil, and the fluid detecting in the described oil balance tube of another compressor be gas or gas mixture time, controlling described oil eliminator to another compressor oil-supplying described stops to a described compressor oil-supplying.
According to the oily balance method of the air-conditioner of the embodiment of the present invention, by detecting fluid state in the oil balance tube of each compressor to judge that whether the fuel head of the lubricating oil in corresponding compressor is higher than predetermined altitude, when detecting that the fuel head of lubricating oil of at least two compressors one is higher than predetermined altitude, and the fuel head of another lubricating oil lower than predetermined altitude time, should be drained in oil eliminator higher than the lubricating oil of predetermined altitude part, and be drained in the compressor of oil starvation from oil eliminator, thus ensure that the fuel head of the lubricating oil in each compressor, avoid occurring the unbalanced phenomenon of pasta between compressor in parallel, improve 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: the resistivity r detecting the fluid in each described oil balance tube, and by the absolute value of the difference of the resistivity r0 of the described resistivity r detected and lubricating oil | △ r| and predetermined difference value △ rk compares; S12a: when | during △ r|≤△ rk, then the fluid in described oil balance tube is lubricating oil; When | during △ r| > △ rk, then the fluid in described oil balance tube is gas or gas mixture.
Particularly, the resistivity r0 of described lubricating oil is obtained by the resistivity of the fluid detecting the second exit of described oil eliminator.
In another embodiment of the present invention, described step S1 comprises: S11b: the temperature value T1 detecting the fluid in each described oil balance tube, and by the absolute value of the difference of the temperature value T0 of the described temperature value T1 that detects and gas | △ T| and predetermined difference value △ TK compares; S12b: when | during △ T| >=△ TK, then the fluid in described oil balance tube is lubricating oil; When | during △ T| < △ TK, then the fluid in described oil balance tube is gas or gas mixture, wherein, obtains described temperature value T0 by the temperature of the fluid detecting the exhaust ports of each described compressor.
In an example of the present invention, the temperature gap of the fluid flowed out by described 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: the temperature value t1 detecting the fluid in each described oil balance tube, and by the absolute value of the difference of the temperature value t0 of the described temperature value t1 that detects and gas | △ t| and predetermined value △ tk compares; S12c: when | during △ t| >=△ tk, then the fluid in described oil balance tube is lubricating oil; When | during △ t| < △ tk, then the fluid in described oil balance tube is gas or gas mixture, wherein, obtains described temperature value t0 by the temperature of the fluid detecting the porch of described oil eliminator.
According to some embodiments of the present invention, between the air inlet of each described compressor and the second outlet of described oil eliminator, be provided with valve, by oil eliminator described in the switch control rule that controls described valve whether to described compressor oil-supplying.
In some embodiments of the invention, be provided with between the described oil balance tube of each described compressor and the entrance of described oil eliminator described oil balance tube towards described oil eliminator Way in one-way conduction described in the check valve of entrance of oil balance tube and described oil eliminator.Thus the gas of discharging in the oil balance tube of the compressor of oil starvation can be avoided to enter in the oil balance tube of the compressor of rich oil in parallel with it, ensure that the stability of air-conditioner.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the flow chart of the oily balance method of air-conditioner according to inventive embodiments;
Fig. 2 is the schematic diagram of air-conditioner according to an embodiment of the invention;
The flow chart of the oily balance method that Fig. 3 is 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;
The flow chart of the oily balance method that Fig. 5 is the air-conditioner shown in Fig. 4;
Fig. 6 is the schematic diagram of the air-conditioner according to another embodiment of the present invention;
The flow chart of the oily balance method that Fig. 7 is the air-conditioner shown in Fig. 6;
Fig. 8 is the schematic diagram according to 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 in A-A direction in Fig. 9;
Figure 11 is the schematic diagram being equipped with the cylinder of 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 in B-B direction in Figure 11;
Figure 13 is the profile being equipped with the cylinder of 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 31, second outlet 32, compressor 4, first compressor 4a,
Second compressor 4b, oil balance tube 40, housing 42, exhaust outlet 420, air inlet 421,
Cylinder 41, first cylinder 41a, the second cylinder 41b, vane slot 410, first through hole 411,
Second through hole 412, third through-hole 413, first end plate 414, second end plate 415, piston 43,
Slide plate 44, valve 5, first pipeline 14, first sensor 6a, 6b, the second pipeline 15,
Second sensor 7, the 3rd sensor 8a, 8b, the 3rd pipeline 16, four-sensor 9,
4th pipeline 17, the 5th sensor 10, check valve 11, expansion valve 12, oil return capillary 13
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of the instruction 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, 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.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.In addition, in describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
Below with reference to the air-conditioner 100 of Fig. 1-Figure 13 description according to the embodiment of the present invention and the oily balance method of this air-conditioner 100.
According to the air-conditioner 100 of 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 entrance 30, first outlet 31 and the second outlet 32, first outlet 31 is 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 exports 32 with second of oil eliminator 3 respectively and is connected with evaporimeter 2, and each compressor 4 is provided with the oil balance tube 40 be communicated with the entrance 30 of oil eliminator 3, when the fuel head of the lubricating oil when the fuel head of the lubricating oil in the compressor of at least two compressors 44 exceedes predetermined altitude and in another compressor 4 of at least two compressors 4 is lower than predetermined altitude, the parts of lubricating oil exceeding 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 another compressor 4 described.Wherein, air-conditioner 100 also comprises the elements such as electric-controlled box, and the operation principle of air-conditioner 100 etc., known by those skilled in the art, are just not described in detail here.
It should be noted that, in air-conditioner 100 below, only describe in this air-conditioner 100 situation comprising two compressors 4 in parallel, but what be worth understanding is, when compressor 4 is two or more, 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, the oil balance tube 40 that two compressors 4 are respectively the first compressor 4a in parallel and the second compressor 4b, the first compressor 4a is communicated with the first compressor 4a inside, and the oil balance tube 40 of the second compressor 4b is communicated with the second compressor 4b is inner.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 exports 32 with second of oil eliminator 3 respectively with the air inlet 421 of the second compressor 4b and is connected, the air inlet 421 of the first compressor 4a is connected with evaporimeter 2 respectively with the air inlet 421 of the second compressor 4b 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, first outlet 31 of oil eliminator 3 is connected with condenser 1, condenser 1 is connected with evaporimeter 2, second outlet 32 places of oil eliminator 3 are also provided with oil return capillary 13, expansion valve 12 is provided with between condenser 1 and evaporimeter 2.
During air-conditioner 100 refrigeration work, the oil-containing gases at high pressure that first compressor 4a and the second compressor 4b discharges enter in oil eliminator 3 and carry out Oil-gas Separation, gases at high pressure after separation enter into after condenser 1 carries out condensation from first of oil eliminator 3 the outlet 31, by expansion valve 12 reducing pressure by regulating flow, low pressure liquid refrigerant enters after evaporimeter 2 carries out sweat cooling, and low-pressure gas gets back to the reservoir side of corresponding 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 first compressor 4a and the second compressor 4b after oil return capillary 13 reducing pressure by regulating flow, lubricating oil gets back to the reservoir side of corresponding first compressor 4a and the second compressor 4b along with low-pressure gas, and is sucked by corresponding first compressor 4a and the second compressor 4b in breathing process thus to get back to corresponding compressor 4 inner.
In the process that air-conditioner 100 works, when detecting that the fuel head of the lubricating oil in the first compressor 4a exceedes predetermined altitude, i.e. rich oil in the first compressor 4a, and detect that the fuel head of the lubricating oil in the second compressor 4b is lower than predetermined altitude, namely during the second compressor 4b inner oil shortage, the parts of lubricating oil exceeding predetermined altitude in first compressor 4a enters in oil eliminator 3 by the oil balance tube 40 of the first compressor 4a, this parts of lubricating oil entered in oil eliminator 3 can enter in the second compressor 4b, thus ensure the fuel head in the first compressor 4a and the second compressor 4b.In other words, in the process that air-conditioner 100 works, whether the fuel head ceaselessly detecting the lubricating oil in the first compressor 4a and the second compressor 4b exceedes predetermined altitude, as long as when the fuel head of the lubricating oil of one of them in the first compressor 4a and the second compressor 4b exceedes predetermined altitude, this lubricating oil exceeding predetermined altitude just to enter in oil eliminator 3 and is discharged in the compressor 4 of oil starvation from oil eliminator 3.Wherein, the fuel head of the lubricating oil detected in any way in the first compressor 4a and the second compressor 4b can be adopted, and specifically set predetermined altitude according to the actual conditions that compressor 4 runs.
According to the air-conditioner 100 of the embodiment of the present invention, by being provided with the oil balance tube 40 be communicated with the entrance 30 of oil eliminator 3 on each compressor 4, when detecting that the fuel head of lubricating oil of at least two compressors 4 one is higher than predetermined altitude, and the fuel head of another lubricating oil lower than predetermined altitude time, should be drained in oil eliminator 3 higher than the lubricating oil of predetermined altitude part, and be drained in the compressor 4 of oil starvation from oil eliminator 3, thus ensure that the fuel head of the lubricating oil in each compressor 4, avoid occurring the unbalanced phenomenon of pasta between compressor 4 in parallel, improve the service life of compressor 4 and air-conditioner 100.
According to the oily balance method of the air-conditioner 100 of the embodiment of the present invention, as shown in Figure 1, comprise the steps:
S1: detect the fluid state in the oil balance tube 40 of each compressor 4.
S2: when the fluid in the oil balance tube 40 one of them compressor 4 being detected in step S1 is lubricating oil, and the fluid detecting in the oil balance tube 40 of another compressor 4 be gas or gas mixture time, controlling oil eliminator 3 to another compressor 4 fuel feeding described stops to described compressor 4 fuel feeding.
Specifically, fluid state in the oil balance tube 40 detecting the first compressor 4a and in the oil balance tube 40 of the second compressor 4b, when the fluid in the oil balance tube 40 the first compressor 4a being detected is lubricating oil, and the fluid detecting in the oil balance tube 40 of the second compressor 4b be gas or gas mixture time, 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 entered in oil balance tube 40 is gas or gas mixture, lubricating oil in the oil balance tube 40 of the first compressor 4a to enter 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 detecting fluid state in the oil balance tube 40 of each compressor 4 to judge that whether the fuel head of the lubricating oil in corresponding compressor 4 is higher than predetermined altitude, when detecting that the fuel head of lubricating oil of at least two compressors 4 one is higher than predetermined altitude, and the fuel head of another lubricating oil lower than predetermined altitude time, should be drained in oil eliminator 3 higher than the lubricating oil of predetermined altitude part, and be drained in the compressor 4 of oil starvation from oil eliminator 3, thus ensure that the fuel head of the lubricating oil in each compressor 4, avoid occurring the unbalanced phenomenon of pasta between compressor 4 in parallel, improve 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, and wherein, lubricating oil is contained in the inner bottom part of housing 42.Cylinder 41 is located in housing 42, vane slot 410, first passage and second channel is provided with in cylinder 41, first passage is communicated with housing 42 is interior with vane slot 410, second channel is communicated with vane slot 410, and one end of oil balance tube 40 is communicated with second channel and the other end stretches out housing 42 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 and one end of slide plate 44 slidably and is only against on piston 43.Be worth understanding, each compressor 4 also comprises the elements such as base bearing, bent axle, supplementary bearing, known by those skilled in the art, is just not described in detail here.Thus make compressor 4 structure simple.
In other words, piston 43 carries out eccentric rotational motion in cylinder 41, slide plate 44 is driven to carry out linear reciprocating motion when piston 43 rotates in the vane slot 410 of cylinder 41, 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 not suspend contracts and expansion.When the fuel head of the lubricating oil of compressor 4 inside exceedes the height of the entrance of first passage, namely whole slide plate chamber back is all immersed in lubricating oil, when slide plate chamber back is expanded, entrance along first passage is entered slide plate chamber back by lubricating oil, 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, in order to lubricating oil when ensureing that slide plate chamber back is shunk can be drained in oil balance tube 40 from second channel, instead of return in housing 42 from the entrance adverse current of first passage, ensure that the size of the entrance of first passage is less than the size of the outlet of second channel in design.When height lower than the entrance of first passage of the fuel head of the lubricating oil in compressor 4, 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, are finally drained in oil eliminator 3 from oil balance tube 40.
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 top of the first through hole 411 and bottom are respectively equipped with the first end plate 414 and the second end plate 415, first end plate 414 is provided with the second through hole 412 be communicated with the first through hole 411, 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, first through hole 411 runs through cylinder 41 on vertical, and the top of the first through hole 411 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 space that the first through hole 411 on cylinder 41 and vane slot 410 enclose is called slide plate chamber back by the first end plate 414, second end plate 415 and slide plate 44 jointly, and the first end plate 414 is provided with the second through hole 412 be communicated with the first through hole 411, and slide plate chamber back is communicated with housing 42 inner space.Thus make cylinder 41 structure simple.Wherein, in of the present invention example, compressor 4 can be single cylinder compressor and also can be duplex cylinder compressor.Wherein, in order to lubricating oil when ensureing that slide plate chamber back is shunk can be drained in oil balance tube 40 from third through-hole 413, 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 figure 8 and 13, cylinder 41 is two and comprises the first cylinder 41a and the second cylinder 41b, first cylinder 41a is located at the top of the second cylinder 41b, first cylinder 41a is provided with the first through hole 411 that in the vertical direction runs through it, the top of the first through hole 411 and bottom are respectively equipped with the first end plate 414 and the second end plate 415, first end plate 414 or the second end plate 415 are provided with the second through hole 412 be communicated with the first through hole 411, 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, in order to lubricating oil when ensureing that slide plate chamber back is shunk can be drained in oil balance tube 40 from third through-hole 413, 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, be provided with valve 5 between the air inlet 421 of each compressor 4 and the second outlet 32 of oil eliminator 3, by the switch control rule oil eliminator 3 of by-pass valve control 5 whether to compressor 4 fuel feeding.Now, in the process that air-conditioner 100 runs, when the fuel head of the lubricating oil in detection first compressor 4a is higher than predetermined altitude, when fuel head in second compressor 4b is lower than predetermined altitude, i.e. the first compressor 4a rich oil, during the second compressor 4b oil starvation, the valve 5 controlled 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 air inlet 421 of the second compressor 4b and the second outlet 32 of oil eliminator 3 is opened, with to oil starvation the second compressor 4b fuel feeding and stop to the first compressor 4a fuel feeding of rich oil, ensure that 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, and each check valve 11 is along the entrance 30 direction one-way conduction oil balance tube 40 of oil balance tube 40 towards oil eliminator 3 of each compressor 4 and the entrance 30 of oil eliminator 3.In other words, be provided with between the oil balance tube 40 of each compressor 4 and the entrance 30 of oil eliminator 3 at the check valve 11 of oil balance tube 40 towards the entrance 30 of the entrance 30 direction one-way conduction oil balance tube 40 of oil eliminator 3 and oil eliminator 3.Thus the gas of discharging in the oil balance tube 40 of the compressor 4 of oil starvation can be avoided to enter in the oil balance tube 40 of the compressor 4 of rich oil in parallel with it, ensure that the stability of air-conditioner 100.
Describe according to the air-conditioner 100 of the present invention's three different embodiments and oily balance method thereof below with reference to Fig. 1-Figure 13, be wherein located at the first end plate 414 for the second through hole 412 and air-conditioner 100 comprises two compressors 4 is described.
Embodiment 1:
As shown in Figures 2 and 3, in an embodiment of the present invention, air-conditioner 100 comprises two first sensors 6a, 6b and second sensor 7, each first sensor is located at for detecting the fluid state in the second pipeline 15 on the second pipeline 15 between the oil balance tube 40 of each compressor 4 and the entrance 30 of oil eliminator 3, and the second outlet 32 of the contiguous oil eliminator 3 of the second sensor 7 arranges to detect the fluid state flowed 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 is for detecting the fluid state on corresponding second pipeline 15.
The oil balance tube 40 of the first compressor 4a and the interior three kinds of fluids that may exist of 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 at a time in only may there is wherein a kind of fluid form.Can by detecting the changing value of the resistivity of the fluid in every bar oil balance tube 40, the fluid can telling 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: the resistivity r detecting the fluid in each oil balance tube 40, and by the absolute value of the difference of the resistivity r0 of the resistivity r detected and lubricating oil | △ r| and predetermined difference value △ rk compares.Particularly, obtained the resistivity r0 of lubricating oil by the resistivity of the fluid detecting the second outlet 32 places of oil eliminator 3, predetermined difference value △ rk experimentally draws.
S12a: when | during △ r|≤△ rk, then the fluid in oil balance tube 40 is lubricating oil; When | during △ r| > △ rk, then the fluid in oil balance tube 40 is gas or gas mixture.
The resistivity r0 of lubricating oil out to be responded to bottom oil eliminator 3 by second sensor 7, first sensor 6a on the second pipeline 15 between first compressor 4a and oil eliminator 3 responds to the resistivity r1 of oil balance tube 40 inner fluid 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 fluid of a certain moment first compressor 4a, first sensor 6b responds to the resistivity r2 of oil balance tube 40 inner fluid of a certain moment 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 is close to therefore △ r1(or △ r2) absolute value namely | △ r1|(or | △ r2|) (actual data value of △ rk will be revised through overtesting) can be fluctuated between 0 to △ rk, what can judge this oil balance tube 40 to exist in this moment is lubricating oil, the fuel head of the lubricating oil in namely corresponding with this oil balance tube 40 compressor 4 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 by oil balance tube 40 and be entered oil eliminator 3.Simultaneously the control terminal of air-conditioner 100 receive between the first compressor 4a and oil eliminator 3 the second pipeline 15 on first sensor 6a or the judgement signal of 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 monitors exists rich oil certainly, now can disconnect the 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 stopped to the lasting fuel feeding action of compressor 4 low-pressure side of rich oil.By above oil extraction action, 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 height face, end plate 414 place for the highest pasta.
When the pasta of lubricating oil is down to below the highest pasta, the fluid entering 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 namely | △ r1|(or | △ r2|) △ rk will be greater than, what can judge oil balance tube 40 internal flow in this moment is gas, air-conditioner 100 control terminal judges that the compressor 4 that this sensor is monitored may occur oil starvation, open the 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, make the oil bottom oil eliminator 3 by getting back in the reservoir of compressor 4 of oil starvation after reducing pressure by regulating flow, and housing 42 inside of compressor 4 is back to by cylinder 41 absorbing gas belt, guarantee below the minimum pasta that pasta sharply can not drop to design and make compressor 4 motion portion cannot form effectively lubricating, complete oil return action.In the present embodiment, minimum pasta is defined as the pasta that motion portion cannot be made to form effective feed lubrication.
When the pasta of lubricating oil fluctuates between minimum pasta and the highest pasta, also there will be the second through hole 412 that oil droplet gaseous mixture enters the first end plate 414 simultaneously, and enter oil balance tube 40 thus distinguished by corresponding first sensor 6a or first sensor 6b, namely detect that the fluid 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 perform oil starvation equally and judge, carries out oil return action to this compressor 4.
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 sensors 6a, 6b and second sensor 7, each first sensor is located at for detecting the fluid state in the second pipeline 15 on the second pipeline 15 between the oil balance tube 40 of each compressor 4 and the entrance 30 of oil eliminator 3, and the second outlet 32 of the contiguous oil eliminator 3 of the second sensor 7 arranges to detect the fluid state flowed 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 is for detecting the fluid state on corresponding second pipeline 15.
Air-conditioner 100 also comprises two the 3rd sensors 8a, 8b and a four-sensor 9, each 3rd covers disposed on sensor is for detecting the fluid state in the 3rd pipeline 16 on the 3rd pipeline 16 between the exhaust outlet 420 and the entrance 30 of oil eliminator 3 of each compressor 4, and four-sensor 9 is located on the 4th pipeline 17 between the first outlet 31 of oil eliminator 3 and condenser 1 for detecting the fluid state on the 4th pipeline 17.In other words, 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 3,3rd 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 is for detecting the fluid state on corresponding 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: the temperature value T1 detecting 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 detected and gas | △ T| and predetermined difference value △ TK compares.Particularly, the temperature gap of the fluid flowed out by first outlet 31 and the second outlet 32 of comparing oil eliminator 3 obtains predetermined difference value △ TK, obtains temperature value T0 by the temperature of the fluid detecting exhaust outlet 420 place of each compressor 4.
S12b: when | during △ T| >=△ TK, then the fluid in oil balance tube 40 is lubricating oil; When | during △ T| < △ TK, then the fluid in oil balance tube 40 is gas or gas mixture.
Specifically, the first sensor 6a fluid temperature (F.T.) detected in the oil balance tube 40 of the first compressor 4a is T1a, the first sensor 6b fluid temperature (F.T.) detected in the oil balance tube 40 of the second compressor 4b is T1b, 3rd sensor 8a detects the temperature T0a 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, 3rd sensor 8b detects the temperature T0b 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, four-sensor 9 responds to the gas temperature T2 discharging oil eliminator 3, the temperature T3 of the lubricating oil of discharging oil eliminator 3 responded to by second sensor 7, due to the form stable of the fluid in four-sensor 9 and these two points for measuring temperature of the second sensor 7, what namely the first outlet 31 of oil eliminator 3 was discharged is always gaseous fluid, oil eliminator 3 second outlet 32 discharge be always lubricating oil, the temperature difference of itself T2 and T3 is predetermined difference value △ TK, and predetermined difference value △ TK is substantially constant when air-conditioner 100 stable conditions.That discharges due to the exhaust outlet 420 of each compressor 4 is always gas mixture simultaneously, and namely the temperature T0b that detects of the temperature T0a that detects of the 3rd sensor 8b and the 3rd sensor 8b is substantially constant.And three kinds of fluids may be there are in the oil balance tube 40 of each compressor 4 for oil, gas mixture or gas, and at a time in only may there is wherein a kind of fluid form, namely may not there is change in oil balance tube 40 inner fluid state in the same time.
Difference △ Ta between the temperature T0a that the temperature T1a that first sensor 6a detects and the 3rd sensor 8a detects can change along with the change of the fluid form in the oil balance tube 40 of the first compressor 4a, difference △ Tb between the temperature T0b that the temperature T1b that first sensor 6b detects and the 3rd sensor 8b detects can change along with the change 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, the fluid then showing in the oil balance tube 40 of the first compressor 4a be lubricating oil or the second compressor 4b oil balance tube 40 in fluid be lubricating oil, now air-conditioner 100 control terminal judges in the first compressor 4a or rich oil in the second compressor 4b, need to carry out oil extraction action.If the fluid in the oil balance tube 40 of the oil balance tube of the first compressor 4a 40 or the second compressor 4b be gas or gas mixture time, T1a ≈ T0a or T1b ≈ T0b, namely | △ Tb| < △ TK or | △ Ta| < △ TK, now air-conditioner 100 control terminal judges in the first compressor 4a or the second compressor 4b inner oil shortage, needs to carry out oil return action.Wherein, be worth understanding, the oil extraction action in the present embodiment is identical with the running of oil return action with the oil extraction action in embodiment 1 with the running of oil return action, is just not described in detail here.
Embodiment 3:
As shown in Figure 6 and Figure 7, air-conditioner 100 also comprises two first sensors 6a, 6b and the 5th sensor 10, each first sensor is located at for detecting the fluid state in the second pipeline 15 on the second pipeline 15 between the oil balance tube 40 of each compressor 4 and the entrance 30 of oil eliminator 3, and the entrance 30 of the contiguous oil eliminator 3 of the 5th sensor 10 arranges to detect the fluid state flowing 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 is for detecting the fluid state on corresponding 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: the temperature value t1 detecting 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 detected and gas | △ t| and predetermined value △ tk compares.Particularly, obtain temperature value t0 by the temperature of the fluid detecting the first outlet 31 places of oil eliminator 3, predetermined value △ tk draws through overtesting.
S12c: when | during △ t| >=△ tk, then the fluid in oil balance tube 40 is lubricating oil; When | during △ t| < △ tk, then the fluid in oil balance tube 40 is gas or gas mixture.
Specifically, 5th sensor 10 detects the gas temperature t0 discharged from the first outlet 31 of oil eliminator 3, first sensor 6a responds to the temperature t1a of the fluid in the oil balance tube 40 of the first compressor 4a, and first sensor 6b responds to the temperature t1b of the fluid in the oil balance tube 40 of the second compressor 4b.
Gaseous fluid is always due to what discharge from the first outlet 31 of oil eliminator 3, therefore the temperature value t0 detected is substantially constant when air-conditioner 100 stable conditions, as benchmark, and three kinds of fluids that may exist in the oil balance tube 40 of each compressor 4 are oil, gas mixture or gas, and at a time in only may there is wherein a kind of fluid form.Difference △ ta between the temperature t1a that first sensor 6a detects and the temperature t0 that the 5th sensor 10 detects can change along with the change of the fluid form in the oil balance tube 40 of the first compressor 4a, difference △ tb between the temperature t1b that first sensor 6b detects and the temperature t0 that the 5th sensor 10 detects can change along with the change of the fluid form in the oil balance tube 40 of the second compressor 4b, the difference △ tb of difference △ ta and t1b-t0 of t1a-t0 in a certain moment can be calculated by the monitoring of temperature, when the absolute value of difference △ ta (or △ tb) is | the actual data value that △ t| is more than or equal to predetermined difference value △ tk(△ tk will be revised through overtesting), the fluid then showing in the oil balance tube 40 of the first compressor 4a be lubricating oil or the second compressor 4b oil balance tube 40 in fluid be lubricating oil, now air-conditioner 100 control terminal judges 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 namely | when △ t| is more than or equal to 0 and is less than △ tk, then 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 terminal judges the first compressor 4a or the second compressor 4b inner oil shortage, needs to carry out oil return action.Wherein, be worth understanding, the oil extraction action in the present embodiment is identical with the running of oil return action with the oil extraction action in embodiment 1 with the running of oil return action, is just not described in detail here.
What deserves to be explained is, in embodiment 1-embodiment 3, the fluid state that first sensor 6a detects and the fluid state that first sensor 6b detects can identical also can be different, in other words, fluid form in the oil balance tube 40 of the first compressor 4a and the fluid form in the oil balance tube 40 of the second compressor 4b can identical also can be different, fluid in the oil balance tube 40 of i.e. the first compressor 4a be gas or gas mixture time, 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 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, namely when the compressor 4 of in two compressors 4 rich oil, then another compressor 4 is in oil starvation state certainly.
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 is defined as the highest pasta, minimum pasta specifically sets according to actual conditions, identical when now principle and second through hole 412 of the structure of air-conditioner 100 and the oily balance method of air-conditioner 100 are positioned at the first end plate 414, be just not described in detail here.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " illustrative examples ", " 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, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (11)
1. the oily balance method of an air-conditioner, 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, each described compressor is provided with the oil balance tube be connected with the entrance of described oil eliminator, the exhaust outlet of described compressor exports with the entrance and second of described oil eliminator respectively with air inlet and is connected, it is characterized in that
Wherein, described oily balance method comprises the steps:
S1: detect the fluid state in the described oil balance tube of each described compressor;
S2: when the fluid in the described oil balance tube one of them compressor being detected in step S1 is lubricating oil, and the fluid detecting in the described oil balance tube of another compressor be gas or gas mixture time, controlling described oil eliminator to another compressor oil-supplying described stops to a described compressor oil-supplying;
Described step S1 comprises:
S11a: the resistivity r detecting the fluid in each described oil balance tube, and by the absolute value of the difference of the resistivity r0 of the described resistivity r detected and lubricating oil | △ r| and predetermined difference value △ rk compares;
S12a: when | during △ r|≤△ rk, then the fluid in described oil balance tube is lubricating oil; When | during △ r| > △ rk, then the fluid in described oil balance tube is gas or gas mixture.
2. the oily balance method of air-conditioner according to claim 1, is characterized in that, is obtained the resistivity r0 of described lubricating oil by the resistivity of the fluid detecting the second exit of described oil eliminator.
3. the oily balance method of air-conditioner according to claim 1, it is characterized in that, valve is provided with, by oil eliminator described in the switch control rule that controls described valve whether to described compressor oil-supplying between the air inlet of each described compressor and the second outlet of described oil eliminator.
4. the oily balance method of air-conditioner according to claim 1, it is characterized in that, be provided with between the described oil balance tube of each described compressor and the entrance of described oil eliminator described oil balance tube towards described oil eliminator Way in one-way conduction described in the check valve of entrance of oil balance tube and described oil eliminator.
5. the oily balance method of an air-conditioner, 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, each described compressor is provided with the oil balance tube be connected with the entrance of described oil eliminator, the exhaust outlet of described compressor exports with the entrance and second of described oil eliminator respectively with air inlet and is connected, it is characterized in that
Wherein, described oily balance method comprises the steps:
S1: detect the fluid state in the described oil balance tube of each described compressor;
S2: when the fluid in the described oil balance tube one of them compressor being detected in step S1 is lubricating oil, and the fluid detecting in the described oil balance tube of another compressor be gas or gas mixture time, controlling described oil eliminator to another compressor oil-supplying described stops to a described compressor oil-supplying;
Described step S1 comprises:
S11b: the temperature value T1 detecting the fluid in each described oil balance tube, and by the absolute value of the difference of the temperature value T0 of the described temperature value T1 that detects and gas | △ T| and predetermined difference value △ TK compares;
S12b: when | during △ T| >=△ TK, then the fluid in described oil balance tube is lubricating oil; When | during △ T| < △ TK, then the fluid in described oil balance tube is gas or gas mixture, wherein, obtains described temperature value T0 by the temperature of the fluid detecting the exhaust ports of each described compressor.
6. the oily balance method of air-conditioner according to claim 5, is characterized in that, the temperature gap of the fluid flowed out by described first outlet and described second outlet of more described oil eliminator obtains predetermined difference value △ TK.
7. the oily balance method of air-conditioner according to claim 5, it is characterized in that, valve is provided with, by oil eliminator described in the switch control rule that controls described valve whether to described compressor oil-supplying between the air inlet of each described compressor and the second outlet of described oil eliminator.
8. the oily balance method of air-conditioner according to claim 5, it is characterized in that, be provided with between the described oil balance tube of each described compressor and the entrance of described oil eliminator described oil balance tube towards described oil eliminator Way in one-way conduction described in the check valve of entrance of oil balance tube and described oil eliminator.
9. the oily balance method of an air-conditioner, 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, each described compressor is provided with the oil balance tube be connected with the entrance of described oil eliminator, the exhaust outlet of described compressor exports with the entrance and second of described oil eliminator respectively with air inlet and is connected, it is characterized in that
Wherein, described oily balance method comprises the steps:
S1: detect the fluid state in the described oil balance tube of each described compressor;
S2: when the fluid in the described oil balance tube one of them compressor being detected in step S1 is lubricating oil, and the fluid detecting in the described oil balance tube of another compressor be gas or gas mixture time, controlling described oil eliminator to another compressor oil-supplying described stops to a described compressor oil-supplying; Described step S1 comprises:
S11c: the temperature value t1 detecting the fluid in each described oil balance tube, and by the absolute value of the difference of the temperature value t0 of the described temperature value t1 that detects and gas | △ t| and predetermined value △ tk compares;
S12c: when | during △ t| >=△ tk, then the fluid in described oil balance tube is lubricating oil; When | during △ t| < △ tk, then the fluid in described oil balance tube is gas or gas mixture, wherein, obtains described temperature value t0 by the temperature of the fluid detecting the first exit of described oil eliminator.
10. the oily balance method of air-conditioner according to claim 9, it is characterized in that, valve is provided with, by oil eliminator described in the switch control rule that controls described valve whether to described compressor oil-supplying between the air inlet of each described compressor and the second outlet of described oil eliminator.
The oily balance method of 11. air-conditioners according to claim 9, it is characterized in that, be provided with between the described oil balance tube of each described compressor and the entrance of described oil eliminator described oil balance tube towards described oil eliminator Way in one-way conduction described in the check valve of entrance of oil balance tube and described oil eliminator.
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