CN102606481A - Anti-overheating device for rotary compressor - Google Patents
Anti-overheating device for rotary compressor Download PDFInfo
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- CN102606481A CN102606481A CN2011100277839A CN201110027783A CN102606481A CN 102606481 A CN102606481 A CN 102606481A CN 2011100277839 A CN2011100277839 A CN 2011100277839A CN 201110027783 A CN201110027783 A CN 201110027783A CN 102606481 A CN102606481 A CN 102606481A
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Abstract
The invention relates to an anti-overheating device for a rotary compressor, a motor and a compression mechanism are arranged in a shell of the rotary compressor. The compression mechanism comprises an air cylinder, a piston, an eccentric crankshaft, a main bearing, an assistant bearing, a slip sheet, a filling hole and a temperature adjusting valve of a high pressure liquid refrigerant circuit; wherein the piston is in eccentric operation in a compression chamber of the air cylinder; the eccentric crankshaft is used for driving the piston; the main bearing and the assistant bearing are used for supporting the bearing crankshaft and sealing the compression chamber, wherein one end of the slip sheet leans against the periphery of the piston; and the filling hole is used for arranging a hole on the compression chamber, the temperature adjusting valve of the high pressure liquid refrigerant circuit in a refrigerating cycle is connected with the filling hole to detect the temperature of gas discharged from the shell so as to control the refrigerant supplied to the filling hole from the high pressure liquid refrigerant circuit. By detecting the temperature of an exhaust pipe through the temperature adjusting valve, the anti-overheating device for the rotary compressor can inject liquid to the compression chamber automatically at high temperature so as to control the exhaust temperature of gas discharged from the compression chamber. The motor coil is cooled by the gas discharged to prevent overheating of the compression, thereby improving the stability of the compressor during operation.
Description
Technical field
The present invention relates to the over-temperature protection of a kind of rotary compressor, particularly a kind of rotary compressor, relevant with the anti-overheated hydrojet cooling technology of rotary compressor in being applied in air-conditioning or refrigeration equipment.
Background technique
In rotary compressor, GWP is hanged down in employing, refrigerant R32 can improve environmental problem raising air-conditioner efficiency efficiently, and improves the travelling comfort of heating operation.But, to compare with in the past refrigerant R22, R410A, it is high more than 10 ℃ that the delivery temperature of R32 is wanted, and when delivery temperature rose, it is overheated that motor coil is understood, and causes rotary compressor overheated, influences its normal use.
Summary of the invention
The object of the invention aims to provide a kind of simple and reasonable, flexible operation, can reduce delivery temperature, prevent the over-temperature protection of the rotary compressor that motor coil is overheated, applied widely, to overcome deficiency of the prior art.
Press the over-temperature protection of a kind of rotary compressor of this purpose design; Be provided with motor and compressing mechanism in the housing of rotary compressor; Compressing mechanism comprises cylinder, in the compression chamber of this cylinder, carries out the eccentric crankshaft of the piston of off-centre operation, driven plunger, supports the main bearing and the supplementary bearing in eccentric crankshaft and seal compression chamber; One end of slide plate is connected to the periphery of piston, and to the hand-hole of compression chamber perforate, it is characterized in that the temperature in the highly pressurised liquid refrigerant loop through connecting hand-hole and freeze cycle is adjusted valve; The gas temperature that detection is discharged from housing, the refrigerant that control is supplied to hand-hole from highly pressurised liquid refrigerant loop.
Said rotary compressor constitutes freeze cycle with condenser, expansion valve, vaporizer at least, and the outlet pipe that temperature adjustment valve detects rotary compressor is to the temperature between the inlet of condenser.
Said temperature adjustment valve comprises adjustment valve body, capillary tube and detector; The adjustment valve body is provided with entrance and exit; Adjustment is provided with diaphragm capsule, needle-valve, valve rod and valve seat in the valve body, and needle-valve and valve seat constitute one group of switch valve between entrance and exit, and an end and the free end of diaphragm capsule of valve rod that is used for the aperture of control switch valve joins; The other end and the needle-valve of valve rod join; An end communication with detection device capillaceous, the other end capillaceous is communicated with the fixed end of diaphragm capsule, and detector is arranged on the outlet pipe of rotary compressor or is arranged on outlet pipe to the pipeline between the inlet of condenser.
Said inlet communicates with highly pressurised liquid refrigerant loop, and outlet communicates with hand-hole.
Said detector is coil type detector, cylinder tube-type detector or telescopic detector.
Said hand-hole is arranged on cylinder, main bearing or the supplementary bearing.
The present invention detects the temperature of outlet pipe through temperature adjustment valve; Can be during high temperature from trend compression chamber hydrojet, so can control the delivery temperature of the discharge gas that comes out from compression chamber, motor coil is discharged from gas cooling; Prevent overheat of compressor, the stability when having improved compressor operating.
That the present invention has is simple and reasonable, flexible operation, can reduce delivery temperature, prevent overheated, the advantage of wide range of application of motor coil.
Description of drawings
Fig. 1 is the broken section structural representation of one embodiment of the invention.
Fig. 2 is the broken section structure for amplifying schematic representation of temperature adjustment valve.
Fig. 3 is the temperature changing curve diagram of each one before the hydrojet.
Fig. 4 is the temperature changing curve diagram of each one after the hydrojet.
Among the figure, R is a rotary compressor, and 2 is housing, and 3 is outlet pipe, and 4 is suction pipe, and 5 is condenser, and 6 is vaporizer, and 7 is expansion valve; 13 is liquid-storage container, and 14 is oil, and 21 is compressing mechanism, and 22 is cylinder, and 23 is compression chamber, and 25 is main bearing, and 26 is supplementary bearing, and 27 is piston; 28 is slide plate, and 29 is eccentric crankshaft, and 30 is exhaust port, and 35 is motor, and 36 is stator, and 37 is rotor, and 38 is motor coil; 41 is guide hole, and 42 is injection pipe, and 43 is hand-hole, and 44 are liquid cooling matchmaker pipe, and 50 are temperature adjustment valve, and 51 are the adjustment valve body, and 52 is the diaphragm capsule; 53 is needle-valve, and 54 is valve seat, and 55 is detector, and 60 is valve rod, and 57 are inlet, and 58 are outlet, and 59 is capillary tube.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Referring to Fig. 1, rotary compressor R is made up of the compressing mechanism 21 that is installed in housing 2 inside, the motor that is configured on the compressing mechanism 21.Housing bottom has oil 14.
The slide plate 28 that compressing mechanism 21 carries out the piston 27 of eccentric rotation by cylinder, in compression chamber 23, move back and forth with this piston 27 synchronously, the eccentric crankshaft 29 of driven plunger 27, constitute with the main bearing 25 and the supplementary bearing 26 of these eccentric crankshaft 29 sliding supports.One end of slide plate 28 is connected to the periphery of piston 27.Main bearing 25 and supplementary bearing 26 seal compression chambeies 23.
Carry in the freeze cycle of rotary compressor R, the gas coolant of discharging from the outlet pipe 3 of rotary compressor R is by from condenser 5, expansion valve 7, vaporizer 6, liquid-storage container 13, circulate to the order of suction pipe 4.The internal pressure of the housing 2 in the present embodiment is a high pressure.
Motor is made up of with the rotor 37 that is fixed on the eccentric crankshaft 29 stator 36 that is fixed on housing 2 inwalls, and motor coil 38 is arranged on the stator 36.
The characteristics of compressing mechanism 21 are to have liquid-jet device.Liquid-jet device is by the guide hole that disposes in the cylinder 41, adjust valve 50 and constitute to the hand-hole 43 of compression chamber 23 openings, the liquid-spraying pipe 42 that connects guide hole 41, the temperature that is connected with this liquid-spraying pipe 42 from this guide hole 41.
Referring to Fig. 2, the schematic diagram of the internal structure of expression temperature adjustment valve 50.Temperature adjustment valve 50 comprises adjustment valve body 51, capillary tube 59 and detector 55; Adjustment valve body 51 is provided with inlet 57 and outlet 58; Be provided with diaphragm capsule 52, needle-valve 53, valve rod 60 and valve seat 54 in the adjustment valve body 51; Needle-valve 53 and valve seat 54 constitutes one group at inlet 57 with export the switch valve between 58, and an end and the free end of diaphragm capsule 52 of valve rod 60 that is used for the aperture of control switch valve joins, and the other end of valve rod 60 and needle-valve 53 join; One end communication with detection device 55 of capillary tube 59, the other end of capillary tube 59 is communicated with the fixed end of diaphragm capsule 52.
Detector 55 is coil type detector, cylinder tube-type detector or telescopic detector.
In the present embodiment, the coil type detector is reeled or is wrapped on the outlet pipe 3.
The outlet 58 of temperature adjustment valve 50 has connected injection pipe 42, and the other end of temperature adjustment valve 50 is connected between condenser 5 and the vaporizer 6.It between condenser 5 and the vaporizer 6 highly pressurised liquid refrigerant loop.
In the present embodiment, adjustment valve body 51 by the needle-valve 53 of the tip setting that is connected diaphragm capsule 52 on the capillary tube 59, the valve rod 60 that installs these diaphragm capsule 52 lower ends, this valve rod, become the detector 55 that the tip of a pair of valve seat 54, capillary tube 59 is provided with needle-valve 53 and form.
Detector 55, capillary tube 59 and diaphragm capsule 52 can be enclosed Freon gas usually.Detector 55 is wrapped in 3 last times of outlet pipe, and the gap is not stayed in closely knit winding, can correct response during through exhaust in the centre of outlet pipe 3.
Be directly proportional with the temperature of exhaust, when the temperature of exhaust changed, the temperature of the freon refrigerant of detector 55 inside can change.The temperature of this freon refrigerant can be reflected as the variation of gas pressure of freon refrigerant, and diaphragm capsule 52 can be flexible, so the gap between needle-valve 53 and the valve seat 54 can change.Its result, the gas flow that passes through via valve seat 54 is by the temperature decision of exhaust.
So, the temperature adjustment valve 50 correct temperature that detect through the exhaust in the middle of the outlet pipe 3.Control is through the inlet 57 of temperature adjustment valve 50 and the coolant quantity of outlet 58.That is, be directly proportional with the temperature of the exhaust of outlet pipe 3, when the temperature of exhaust was high, it is many that the coolant quantity that passes through will become, and when the temperature of exhaust was hanged down, the coolant quantity that passes through will tail off.When the temperature of exhaust was too low, the coolant quantity that passes through was 0.
Referring to Fig. 3, be that increase, the compressor temperature inside of the compression load Load of expression accompanying rotation formula compressor R can uprise.In addition, this temperature variation is a typical example, not necessarily representes the temperature variation in whole operating conditionss.
Transverse axis is a time shaft, and the longitudinal axis is a temperature axis.Tm is the temperature of motor coil 38, and Td is the temperature of the exhaust when passing through outlet pipe 3, and To is the oil temperature, and Tc is the temperature from the exhaust of exhaust port 30 discharges of cylinder.
The rotary compressor R that carries in the freeze cycle forwards stable operation to after starting.At this moment, operating conditions is a gauge load, so the temperature T m of motor coil is about 100 ℃, other temperature is also in the scope of safe enough.
Press in the housing 2 in the high back pressure rotary compressor that equates with exhaust pressure, the order of generally pressing Tc＜To＜Td＜Tm, temperature rises gradually.That is, the temperature T c of the exhaust of discharging from the exhaust port of cylinder 30 is minimum, and the temperature T m of motor coil 38 is the highest.Therefore, arrive through motor can the cooling motor coil in the process of outlet pipe in exhaust.
After exhaust of discharging from cylinder and motor coil carried out heat exchange, temperature can rise, and during through outlet pipe, the temperature T d of exhaust is between Tm and Tc.
The oil that in housing, moves is the exhaust cooling of Tc by the temperature of discharging from cylinder, but because motor coil can be overheated, so oily temperature To is between Td and Tc.And in the operating conditions of standard, Tm can be higher 15～20 ℃ than Tc.
But after beginning to increase the time t (s) of compression load from the standard operating conditions, the temperature T c of the exhaust of discharging from cylinder can rise, and in addition, motor coil temperature T m also can rise.Consequently: the temperature T d and the oily temperature To of the exhaust of process outlet pipe also can uprise.
When compression load increased, the temperature T m of motor coil 38 can surpass allow 125 ℃ of boundary, and, can surpass may scaling loss 130 ℃.In addition, oily temperature To can surpass 100 ℃, and therefore, because oil viscosity reduces, the lubricating condition of making each component of slide relative can worsen, and promptly brings the fault of compressor possibly.
Under harsh like this condition, present embodiment can reduce through the temperature T c that temperature is adjusted the exhaust that valve 50 and liquid-jet device will discharge from cylinder automatically, prevents temperature T m and oily temperature To overheated of motor coil.
Fit tightly and be fixed on detector 55 on the outlet pipe 3 according to the variation of temperature of outlet pipe, the variation of the temperature T d of the exhaust according to through outlet pipe 3 time just, and change the pressure of enclosing the refrigerant in the diaphragm capsule.
When the temperature T d of the exhaust in the outlet pipe arrives predefined temperature when above, the diaphragm capsule that communicates with detector 55 will expand, and valve rod can descend, and needle-valve 53 can be opened, and valve seat 54 can perforates.And the temperature T d of the exhaust in the outlet pipe can increase, and it is big that the open channel of valve seat 54 can become.
Behind valve seat 54 openings, the liquid coolant in the highly pressurised liquid refrigerant loop of freeze cycle is managed 44 valve seats 54 through temperature adjustment valve 50 through the liquid cooling matchmaker and is injected to compression chamber 23 from hand-hole 43.The temperature of the gas that therefore, in compression chamber, compresses can descend.And, to the injection amount of the liquid coolant of compression chamber 23, by the aperture control of the valve seat 54 of temperature adjustment valve 50.Therefore, the temperature T m of motor coil and oily temperature To are no matter operating conditions how, can remain in the allowed band usually.
Referring to Fig. 4, when the control of expression temperature adjustment valve 50 and liquid-jet device action, temperature variation everywhere.
After liquid coolant injected compression chamber, the temperature T c of the exhaust of discharging from the exhaust port 30 of cylinder can reduce at once, and subsequently, the temperature T m of motor coil and oily temperature To also can be reduced in the temperature range of permission.
Therefore; The present invention can monitor the temperature T d of the exhaust in the outlet pipe on one side through temperature adjustment valve 50; Increase the operating load of compressor on one side; After more than the temperature T d of the exhaust in the outlet pipe arrives predefined value, the needle-valve 53 meeting perforates or the increase aperture of temperature adjustment valve 50, the temperature T d of the exhaust in the control outlet pipe is in suitable scope.
Owing to the temperature T m of motor coil and oily temperature To, stronger coherence is arranged, so the temperature T d through the exhaust in the control outlet pipe just can be controlled at the temperature T m and the oily temperature To of motor coil in the allowed band with the temperature T d of exhaust in the outlet pipe.Consequently, can prevent the overheated of compressor in advance, compressor has higher reliability.
In addition, if can prevent the overheated of compressor in advance, the higher refrigerant characteristic of the temperature of the exhaust resemble R32 just can effectively be used, and the indoor leaving air temp when raising is heated contributes with the raising heating capacity.
In addition, in the embodiments of the invention, simplified the detailed description of liquid-jet device, but, in technology in the past, also had open for the hydrojet technological scheme of rotary compressor.In the present invention, much less can certainly use these hydrojet technological schemes in the past.
Present air conditioner is in order to prevent the loss of heating capacity, from the outlet pipe of compressor to carrying out the heat insulation common practise that belongs to the pipe arrangement of condenser.Therefore, detect the position of gas exhausting tube temperature through temperature adjustment valve, being not necessarily will be at the outlet pipe place of compressor, also can be at the outlet pipe of compressor to the pipeline between the inlet of condenser.
In addition, as the detection means of the temperature of the exhaust in the outlet pipe, adopted the detector of coil type in the embodiments of the invention, but also had the whole bag of tricks such as cylindrical duct detection mode, these modes also can adopt.
Claims (6)
1. the over-temperature protection of a rotary compressor; Be provided with motor and compressing mechanism (21) in the housing (2) of rotary compressor (R); Compressing mechanism (21) comprises cylinder, in the compression chamber (23) of this cylinder, carries out the eccentric crankshaft (29) of the piston (27) of off-centre operation, driven plunger (27), supports the main bearing (25) and the supplementary bearing (26) of eccentric crankshaft (29) and seal compression chamber (23); One end of slide plate (28) is connected to the periphery of piston (27); And to the hand-hole (43) of compression chamber (23) perforate; It is characterized in that detecting the gas temperature of discharging, control from highly pressurised liquid refrigerant loop to the refrigerant of hand-hole (43) supply from housing (2) through the temperature adjustment valve (50) in the highly pressurised liquid refrigerant loop that connects hand-hole (43) and freeze cycle.
2. the over-temperature protection of rotary compressor according to claim 1; It is characterized in that said rotary compressor (R) at least and condenser (5), expansion valve (7), vaporizer (6) constitute freeze cycle, temperature adjustment valve (50) detects the outlet pipe (3) of rotary compressor (R) to the temperature between the inlet of condenser (5).
3. according to the over-temperature protection of claim 1 or 2 described rotary compressors; It is characterized in that said temperature adjustment valve (50) comprises adjustment valve body (51), capillary tube (59) and detector (55); Adjustment valve body (51) is provided with inlet (57) and outlet (58); Be provided with diaphragm capsule (52), needle-valve (53), valve rod (60) and valve seat (54) in the adjustment valve body (51); Needle-valve (53) and valve seat (54) constitute one group of switch valve that is positioned between inlet (57) and the outlet (58); The end and the free end of diaphragm capsule (52) that are used for the valve rod (60) of the aperture of control switch valve join, and the other end of valve rod (60) and needle-valve (53) join, an end communication with detection device (55) of capillary tube (59); The other end of capillary tube (59) is communicated with the fixed end of diaphragm capsule (52), and detector (55) is arranged on the outlet pipe (3) of rotary compressor (R) and goes up or be arranged on outlet pipe (3) to the pipeline between the inlet of condenser (5).
4. according to the over-temperature protection of the described rotary compressor of claim 3, it is characterized in that said inlet (57) communicates with highly pressurised liquid refrigerant loop, outlet (58) communicates with hand-hole (43).
5. according to the over-temperature protection of the described rotary compressor of claim 4, it is characterized in that said hand-hole (43) is arranged on cylinder, main bearing (25) or the supplementary bearing (26).
6. according to the over-temperature protection of the described rotary compressor of claim 3, it is characterized in that said detector (55) is coil type detector, cylinder tube-type detector or telescopic detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100277839A CN102606481A (en) | 2011-01-25 | 2011-01-25 | Anti-overheating device for rotary compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100277839A CN102606481A (en) | 2011-01-25 | 2011-01-25 | Anti-overheating device for rotary compressor |
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| CN102606481A true CN102606481A (en) | 2012-07-25 |
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| CN2011100277839A Pending CN102606481A (en) | 2011-01-25 | 2011-01-25 | Anti-overheating device for rotary compressor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806523A (en) * | 2015-04-27 | 2015-07-29 | 西安交通大学 | Two-stage rotary type compressor and operating method thereof |
| CN104884807A (en) * | 2013-03-27 | 2015-09-02 | 东芝开利株式会社 | Rotary compressor and refrigeration cycle device |
| CN105674435A (en) * | 2016-01-25 | 2016-06-15 | 珠海格力电器股份有限公司 | Refrigerant pouring method of air conditioner outdoor unit |
| CN107255340A (en) * | 2017-06-14 | 2017-10-17 | 青岛海尔空调器有限总公司 | Prevent the control method and control system of the overheat of compressor of transducer air conditioning |
| CN109323492A (en) * | 2018-09-07 | 2019-02-12 | 青岛海尔智能技术研发有限公司 | The method, apparatus and computer storage medium of cold-heat exchange system control |
| CN110423678A (en) * | 2018-11-05 | 2019-11-08 | 西安尼勒生物科技有限公司 | A kind of extracellular enzyme detection device of soil |
| US11085661B2 (en) | 2017-12-08 | 2021-08-10 | Danfoss (Tianjin) Ltd. | Fluid injection control system and fluid circulation system |
| US11486621B2 (en) | 2017-12-08 | 2022-11-01 | Danfoss (Tianjin) Ltd. | Controller and method for compressor, compressor assembly and refrigeration system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107255340A (en) * | 2017-06-14 | 2017-10-17 | 青岛海尔空调器有限总公司 | Prevent the control method and control system of the overheat of compressor of transducer air conditioning |
| WO2018228135A1 (en) * | 2017-06-14 | 2018-12-20 | 青岛海尔空调器有限总公司 | Control method and system for preventing compressor overheating of variable-frequency air conditioner |
| CN107255340B (en) * | 2017-06-14 | 2020-02-04 | 青岛海尔空调器有限总公司 | Control method and control system for preventing compressor of inverter air conditioner from overheating |
| US11085661B2 (en) | 2017-12-08 | 2021-08-10 | Danfoss (Tianjin) Ltd. | Fluid injection control system and fluid circulation system |
| US11486621B2 (en) | 2017-12-08 | 2022-11-01 | Danfoss (Tianjin) Ltd. | Controller and method for compressor, compressor assembly and refrigeration system |
| CN109323492A (en) * | 2018-09-07 | 2019-02-12 | 青岛海尔智能技术研发有限公司 | The method, apparatus and computer storage medium of cold-heat exchange system control |
| CN110423678A (en) * | 2018-11-05 | 2019-11-08 | 西安尼勒生物科技有限公司 | A kind of extracellular enzyme detection device of soil |
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Application publication date: 20120725 |