CN105509367A - Oil return control method and device and outdoor unit of variable-frequency air conditioner - Google Patents
Oil return control method and device and outdoor unit of variable-frequency air conditioner Download PDFInfo
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- CN105509367A CN105509367A CN201410502501.XA CN201410502501A CN105509367A CN 105509367 A CN105509367 A CN 105509367A CN 201410502501 A CN201410502501 A CN 201410502501A CN 105509367 A CN105509367 A CN 105509367A
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- frequency
- premises station
- capillary
- changeable compressor
- magnetic valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
Abstract
An embodiment of the invention provides an oil return control method and device and an outdoor unit of a variable-frequency air conditioner so as to at least solve the problem that the refrigerating or heating capacity of an air conditioner is decreased when a variable-frequency compressor operates at low-frequency and middle-frequency bands. The variable-frequency air conditioner comprises the outdoor unit, the outdoor unit comprises a variable-frequency compressor and an oil separator communicated with the variable-frequency compressor, the outdoor unit further comprises an outdoor unit electronic expansion valve, one end of the outdoor unit electronic expansion valve is communicated with the oil separator, and the other end is communicated with the variable-frequency compressor. The method comprises steps as follows: the first operating frequency of the variable-frequency compressor is detected; according to the first operating frequency and the pre-stored corresponding relation, a first open degree value of the outdoor unit electronic expansion valve corresponding to the first operating frequency is determined, wherein the corresponding relation is the corresponding relation between the operating frequency and open degree values of the outdoor unit electronic expansion valve; the open degree value of the outdoor unit electronic expansion valve is adjusted to the first open degree value. The invention is applicable to the technical field of air conditioners.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly relate to the control method of convertible frequency air-conditioner oil return, device and off-premises station.
Background technology
Along with the raising day by day of people's living standard, also more and more higher to the requirement of air-conditioning heating/refrigeration performance.Usually, the key factor affecting the heating of air-conditioning/refrigeration performance is exactly the compressor in air-conditioning.
At present, compressor in air-conditioning also cannot realize oil-free lubrication, and lubricating oil is to the material of lubricate between moving component in compressor, if compressor lacks lubricating oil, compressor electric motor bearing and compression chamber will can not get effectively lubricating, thus friction aggravation can cause compressor damage.But during compressor operation, lubricating oil can be discharged with refrigerant.On the one hand, the lubricating oil of discharge enters heat exchanger with refrigerant, affects heat exchange efficiency, thus causes the heating of air-conditioning/refrigeration performance to reduce; On the other hand, the lubricating oil of discharge can not return compressor in time, causes compressor lubrication not enough, thus exacerbates the friction of motor bearings and compression chamber in compressor, accelerate the damage of compressor.
In prior art, in order to solve the problem, when designing the off-premises station of air-conditioning, as shown in Figure 1, except the heat exchanger comprising compressor 11, cross valve 10 and be connected with cross valve 10 in the off-premises station 1 of air-conditioning, also comprise the oil eliminator 12 that is connected with compressor 11 and one end is connected with oil eliminator 12, the capillary 13 that the other end is connected with compressor 11.Oil eliminator 12 is increased by the exhaust outlet at compressor 11, and at bottom design one capillary 13 of oil eliminator 12, on the one hand, the lubricating oil mixed in refrigerant can at the bottom deposit of oil eliminator 12, and return compressor 11 by capillary 13, thus ensure that the oil return safety of compressor 11; On the other hand, enter heat exchanger through the refrigerant be separated by the outlet of oil eliminator 12, what ensure that air-conditioning heats/refrigeration performance.
But the lubricating oil discharge rate of compressor is relevant with operating frequency.For the frequency-changeable compressor in convertible frequency air-conditioner, the coolant quantity that operating frequency difference is then discharged is different, and the lubricants capacity therefore contained in refrigerant is also different.And the oil mass that in Fig. 1, capillary 13 passes through, namely the recirculating oil quantity of system is only relevant with the pressure reduction at capillary 13 two ends, and the operating frequency of compressor 11 has nothing to do.By controlling the pressure reduction at capillary 13 two ends, to ensure that the lubricating oil that compressor 11 is discharged returns compressor 11 by capillary 13.And be the requirement of maximum lubricating oil discharge rate when ensureing that the recirculating oil quantity of frequency-conversion air-conditioning system can meet the highest operating frequency, in prior art when designing capillary 13, can only according to frequency-changeable compressor the highest operating frequency time maximum lubricating oil discharge rate design.This will make frequency-changeable compressor when low frequency and Mid Frequency running, the oil mass of discharging due to frequency-changeable compressor is relatively less, and the pressure reduction at capillary 13 two ends is substantially constant, thus cause the bypass amount of capillary 13 excessive, namely refrigerant also returns frequency-changeable compressor by capillary 13, and then make to enter the refrigerant that in heat exchanger, participation heats/freezes and relatively reduce, occur that the heating of air-conditioning/refrigerating capacity reduces, the problem that the heating of air-conditioning/refrigeration performance declines.
Summary of the invention
Embodiments of the invention provide a kind of control method of convertible frequency air-conditioner oil return, device and off-premises station, the problem declined with the refrigeration or heating capacity that at least solve frequency-changeable compressor air-conditioning when low frequency and Mid Frequency running.
For solving the problem, embodiments of the invention adopt following technical scheme:
First aspect, a kind of control method of convertible frequency air-conditioner oil return is provided, described convertible frequency air-conditioner comprises off-premises station, the oil eliminator that described off-premises station comprises frequency-changeable compressor and is connected with described frequency-changeable compressor, described off-premises station also comprises off-premises station electric expansion valve, wherein, one end of described off-premises station electric expansion valve is connected with described oil eliminator, and the other end is connected with described frequency-changeable compressor;
Described method comprises:
Detect the first operating frequency of described frequency-changeable compressor;
According to described first operating frequency, and the corresponding relation prestored, determine the first opening value of the described off-premises station electric expansion valve that described first operating frequency is corresponding, wherein, described corresponding relation is the corresponding relation of the opening value of operating frequency and described off-premises station electric expansion valve;
The opening value of described off-premises station electric expansion valve is adjusted to described first opening value.
Second aspect, a kind of control device of convertible frequency air-conditioner oil return is provided, described convertible frequency air-conditioner comprises off-premises station, the oil eliminator that described off-premises station comprises frequency-changeable compressor and is connected with described frequency-changeable compressor, described off-premises station also comprises off-premises station electric expansion valve, wherein, one end of described off-premises station electric expansion valve is connected with described oil eliminator, and the other end is connected with described frequency-changeable compressor;
The control device of described convertible frequency air-conditioner oil return comprises: detecting unit, determining unit, adjustment unit;
Described detecting unit, for detecting the first operating frequency of described frequency-changeable compressor;
Described determining unit, for according to described first operating frequency, and the corresponding relation prestored, determine the first opening value of the described off-premises station electric expansion valve that described first operating frequency is corresponding, wherein, described corresponding relation is the corresponding relation of the opening value of operating frequency and described off-premises station electric expansion valve;
Described adjustment unit, for being adjusted to described first opening value by the opening value of described off-premises station electric expansion valve.
The third aspect, a kind of off-premises station of convertible frequency air-conditioner is provided, the oil eliminator that described off-premises station comprises frequency-changeable compressor, is connected with described frequency-changeable compressor, described off-premises station also comprises the control device of off-premises station electric expansion valve and the convertible frequency air-conditioner oil return as described in second aspect, wherein, one end of described off-premises station electric expansion valve is connected with described oil eliminator, and the other end is connected with described frequency-changeable compressor.
The control method of the convertible frequency air-conditioner oil return that the embodiment of the present invention provides, device and off-premises station, by detecting the first operating frequency of frequency-changeable compressor, obtain the current operating frequency of frequency-changeable compressor.By this first operating frequency, and the corresponding relation of the opening value of the operating frequency prestored and this off-premises station electric expansion valve, determine the first opening value of this off-premises station electric expansion valve that this first operating frequency is corresponding, namely determine the opening value of the off-premises station electric expansion valve corresponding with the current operating frequency of frequency-changeable compressor.By the opening value of this off-premises station electric expansion valve is adjusted to this first opening value, make the current opening value of off-premises station electric expansion valve corresponding with the current operating frequency of frequency-changeable compressor.Size due to electronic expansion valve opening directly determines the recirculating oil quantity of frequency-conversion air-conditioning system, and the operating frequency of frequency-changeable compressor directly determines the oil drain quantity of frequency-conversion air-conditioning system, therefore based on such scheme, the recirculating oil quantity in frequency-conversion air-conditioning system can be made suitable with the lubricants capacity of discharging from frequency-changeable compressor, on the one hand, ensure that the lubricating oil of discharge returns compressor in time, ensure that the reliable running of compressor; On the other hand, to prevent in prior art frequency-changeable compressor when low frequency and Mid Frequency running, the bypass amount of capillary is excessive, namely refrigerant also returns by oil return capillary the problem that the heating of the air-conditioning that compressor produces/refrigeration performance declines, improve frequency-changeable compressor when low frequency and Mid Frequency running air-conditioning heat/refrigeration performance.
Fourth aspect, a kind of control method of convertible frequency air-conditioner oil return is provided, described convertible frequency air-conditioner comprises off-premises station, the oil eliminator that described off-premises station comprises frequency-changeable compressor and is connected with described frequency-changeable compressor, described off-premises station also comprises capillary and the magnetic valve of at least two group series connection, parallel with one another between the capillary of described at least two group series connection and magnetic valve, the capillary of described at least two group series connection is connected with described oil eliminator with one end of magnetic valve, and the other end is connected with described frequency-changeable compressor;
Described method comprises:
Detect the first operating frequency of described frequency-changeable compressor;
According to described first operating frequency, in conjunction with preset strategy, the open and close of magnetic valve in the capillary of at least two groups series connection described in control and magnetic valve.
5th aspect, a kind of control device of convertible frequency air-conditioner oil return is provided, described convertible frequency air-conditioner comprises off-premises station, the oil eliminator that described off-premises station comprises frequency-changeable compressor and is connected with described frequency-changeable compressor, described off-premises station also comprises capillary and the magnetic valve of at least two group series connection, parallel with one another between the capillary of described at least two group series connection and magnetic valve, the capillary of described at least two group series connection is connected with described oil eliminator with one end of magnetic valve, and the other end is connected with described frequency-changeable compressor;
The control device of described convertible frequency air-conditioner oil return comprises: detecting unit, control unit;
Described detecting unit, for detecting the first operating frequency of described frequency-changeable compressor;
Described control unit, for according to described first operating frequency, in conjunction with preset strategy, the open and close of magnetic valve in the capillary of at least two groups series connection described in control and magnetic valve.
6th aspect, a kind of off-premises station of convertible frequency air-conditioner is provided, the oil eliminator that described off-premises station comprises frequency-changeable compressor, is connected with described frequency-changeable compressor, it is characterized in that, described off-premises station also comprises the capillary of at least two group series connection and the control device of magnetic valve and the convertible frequency air-conditioner oil return as described in the 5th aspect, wherein, parallel with one another between the capillary of described at least two group series connection and magnetic valve, the capillary of described at least two group series connection is connected with described oil eliminator with one end of magnetic valve, and the other end is connected with described frequency-changeable compressor.
The control method of the convertible frequency air-conditioner oil return that the embodiment of the present invention provides, device and off-premises station, by detecting the first operating frequency of frequency-changeable compressor, obtain the current operating frequency of frequency-changeable compressor.By this first operating frequency, in conjunction with preset strategy, control the capillary of this at least two group series connection and the open and close of magnetic valve, make the open and close of current electromagnetic valve corresponding with the current operating frequency of frequency-changeable compressor.Due to the open and close of magnetic valve, the capillary of different length and/or quantity can be made to be in connected state, directly determine the recirculating oil quantity of frequency-conversion air-conditioning system, and the operating frequency of frequency-changeable compressor directly determines the oil drain quantity of frequency-conversion air-conditioning system, therefore based on such scheme, the recirculating oil quantity in frequency-conversion air-conditioning system can be made suitable with the lubricants capacity of discharging from frequency-changeable compressor, on the one hand, ensure that the lubricating oil of discharge returns compressor in time, ensure that the reliable running of compressor; On the other hand, to prevent in prior art frequency-changeable compressor when low frequency and Mid Frequency running, the bypass amount of capillary is excessive, namely refrigerant also returns the problem of heating/freezing of the air-conditioning that compressor produces or hydraulic performance decline by oil return capillary, improve frequency-changeable compressor when low frequency and Mid Frequency running air-conditioning heat/refrigeration performance.
Accompanying drawing explanation
Fig. 1 is the off-premises station composition schematic diagram of air-conditioning in prior art;
The off-premises station composition schematic diagram one of a kind of convertible frequency air-conditioner that Fig. 2 provides for the embodiment of the present invention;
The control method schematic flow sheet one of a kind of convertible frequency air-conditioner oil return that Fig. 3 provides for the embodiment of the present invention;
The control method schematic flow sheet two of a kind of convertible frequency air-conditioner oil return that Fig. 4 provides for the embodiment of the present invention;
The organigram one of the control device of a kind of convertible frequency air-conditioner oil return that Fig. 5 provides for the embodiment of the present invention;
The organigram two of the control device of a kind of convertible frequency air-conditioner oil return that Fig. 6 provides for the embodiment of the present invention;
The off-premises station composition schematic diagram two of a kind of convertible frequency air-conditioner that Fig. 7 provides for the embodiment of the present invention;
The control method schematic flow sheet three of a kind of convertible frequency air-conditioner oil return that Fig. 8 provides for the embodiment of the present invention;
The control method schematic flow sheet four of a kind of convertible frequency air-conditioner oil return that Fig. 9 provides for the embodiment of the present invention;
The organigram three of the control device of a kind of convertible frequency air-conditioner oil return that Figure 10 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the control method of the convertible frequency air-conditioner oil return of various embodiments of the present invention, device and off-premises station are described in detail.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For the ease of the technical scheme of the clear description embodiment of the present invention, in an embodiment of the present invention, have employed the printed words such as " first ", " second " to distinguish the substantially identical identical entry of function and efficacy or similar item, it will be appreciated by those skilled in the art that " first ", " second ", etc. printed words quantity and execution order are not limited.
Embodiment one,
The embodiment of the present invention provides a kind of control method of convertible frequency air-conditioner oil return, is particularly applicable in the off-premises station 1 of convertible frequency air-conditioner as shown in Figure 2, and the off-premises station 1 of this convertible frequency air-conditioner comprises:
Frequency-changeable compressor 11, the oil eliminator 12 be connected with this frequency-changeable compressor 11, the control device 15 of off-premises station electric expansion valve 14 and convertible frequency air-conditioner oil return.One end of this off-premises station electric expansion valve 14 is connected with oil eliminator 12, and the other end is connected with frequency-changeable compressor 11.Wherein, the control device 15 of convertible frequency air-conditioner oil return is for controlling the off-premises station electric expansion valve 14 in frequency-conversion air-conditioning system, this off-premises station electric expansion valve 14 has the adjustable characteristic of aperture, the lubricants capacity turned back to from the oil eliminator 12 of the off-premises station 1 of convertible frequency air-conditioner frequency-changeable compressor 11 can be controlled by the opening value of the outer organic electronic expansion valve 14 of conditioning chamber, namely control the recirculating oil quantity of frequency-conversion air-conditioning system, make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor 11.
As shown in Figure 3, the method specifically comprises:
First operating frequency of S101, detection frequency-changeable compressor.
S102, according to the first operating frequency, and the corresponding relation prestored, determine the first opening value of the off-premises station electric expansion valve that the first operating frequency is corresponding, wherein, this corresponding relation is the corresponding relation of the opening value of operating frequency and this off-premises station electric expansion valve.
It should be noted that, in embodiments of the present invention, the corresponding relation of the opening value of operating frequency and this off-premises station electric expansion valve 14 is man-to-man mapping relations, namely under frequency-changeable compressor 11 running status, and the opening value of the corresponding unique electric expansion valve 14 of each operating frequency; Or, under frequency-changeable compressor 11 running status, the opening value of the corresponding unique electric expansion valve 14 of each operating frequency section.So, after control device 15 detection of convertible frequency air-conditioner oil return obtains the first operating frequency of frequency-changeable compressor 11, during the first opening value according to the corresponding relation determination off-premises station electric expansion valve 14 prestored, just must obtain unique the first corresponding opening value.
S103, the opening value of off-premises station electric expansion valve is adjusted to the first opening value.
Preferably, the embodiment of the present invention also provides a kind of control method of convertible frequency air-conditioner oil return, as shown in Figure 4, before the aperture of this off-premises station electric expansion valve being adjusted to this first opening value (step S103), also comprises:
Whether S104, the current opening value judging off-premises station electric expansion valve are the first opening value.
If the current opening value of this off-premises station electric expansion valve is not this first opening value, perform step S103.
By above-mentioned preferred version, can when the current opening value of off-premises station electric expansion valve be the first opening value, the step opening value of this off-premises station electric expansion valve being adjusted to the first opening value need not be performed again, thus saved frequency-conversion air-conditioning system resource, off-premises station electric expansion valve also can be avoided because repeatedly adjusting to affect the problem in flexibility ratio and life-span.
The control method of the convertible frequency air-conditioner oil return that the embodiment of the present invention provides, by detecting the first operating frequency of frequency-changeable compressor, obtains the current operating frequency of frequency-changeable compressor.By this first operating frequency, and the corresponding relation of the opening value of the operating frequency prestored and this off-premises station electric expansion valve, determine the first opening value of this off-premises station electric expansion valve that this first operating frequency is corresponding, namely determine the opening value of the off-premises station electric expansion valve corresponding with the current operating frequency of frequency-changeable compressor.By the opening value of this off-premises station electric expansion valve is adjusted to this first opening value, make the current opening value of off-premises station electric expansion valve corresponding with the current operating frequency of frequency-changeable compressor.Size due to off-premises station electronic expansion valve opening directly determines the recirculating oil quantity of frequency-conversion air-conditioning system, and the operating frequency of frequency-changeable compressor directly determines the oil drain quantity of frequency-conversion air-conditioning system, therefore the control method of convertible frequency air-conditioner oil return that the embodiment of the present invention provides can make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor, on the one hand, ensure that the lubricating oil of discharge returns compressor in time, ensure that the reliable running of compressor; On the other hand, to prevent in prior art frequency-changeable compressor when low frequency and Mid Frequency running, the bypass amount of capillary is excessive, namely refrigerant also returns compressor by capillary, the problem that the heating of the air-conditioning produced/refrigeration performance declines, improve frequency-changeable compressor when low frequency and Mid Frequency running air-conditioning heat/refrigeration performance.
Embodiment two,
The embodiment of the present invention provides a kind of control device 15 of convertible frequency air-conditioner oil return, be particularly applicable in the off-premises station 1 of convertible frequency air-conditioner as shown in Figure 2, for the off-premises station 1 of this convertible frequency air-conditioner, specifically can the description of Fig. 2 in reference example one, the embodiment of the present invention does not repeat them here.
As shown in Figure 5, the control device 15 of this convertible frequency air-conditioner oil return comprises: detecting unit 501, determining unit 502, adjustment unit 503.
Wherein, detecting unit 501, for detecting the first operating frequency of frequency-changeable compressor.
Determining unit 502, for according to this first operating frequency, and the corresponding relation prestored, determine the first opening value of this off-premises station electric expansion valve that this first operating frequency is corresponding, wherein, this corresponding relation is the corresponding relation of the opening value of operating frequency and this off-premises station electric expansion valve.
Adjustment unit 503, for being adjusted to the first opening value by the opening value of this off-premises station electric expansion valve.
Preferably, the embodiment of the present invention also provides a kind of control device 15 of convertible frequency air-conditioner oil return, and as shown in Figure 6, the control device 15 of this convertible frequency air-conditioner oil return also comprises judging unit 504.
Judging unit 504, before the opening value of this off-premises station electric expansion valve being adjusted to this first opening value at adjustment unit 503, judges whether the current opening value of this off-premises station electric expansion valve is this first opening value;
Adjustment unit 503 specifically for:
If judging unit 504 judges that the current opening value of this off-premises station electric expansion valve is not this first opening value, the opening value of this off-premises station electric expansion valve is adjusted to this first opening value.
Wherein, the control method of being carried out convertible frequency air-conditioner oil return by the control device 15 of this convertible frequency air-conditioner oil return can the description of reference example one, and the embodiment of the present invention does not repeat them here.
The control device of the convertible frequency air-conditioner oil return that the embodiment of the present invention provides, detects the first operating frequency of frequency-changeable compressor by detecting unit, obtain the current operating frequency of frequency-changeable compressor.By determining unit according to this first operating frequency, and the corresponding relation of the opening value of the operating frequency prestored and this off-premises station electric expansion valve, obtain the first opening value of off-premises station electric expansion valve corresponding to this first operating frequency, namely obtain the opening value of the off-premises station electric expansion valve corresponding with the current operating frequency of frequency-changeable compressor.By adjustment unit, the opening value of this off-premises station electric expansion valve is adjusted to this first opening value, makes the current opening value of off-premises station electric expansion valve corresponding with the current operating frequency of frequency-changeable compressor.Size due to electronic expansion valve opening value directly determines the recirculating oil quantity of frequency-conversion air-conditioning system, and the operating frequency of frequency-changeable compressor directly determines the oil drain quantity of frequency-conversion air-conditioning system, therefore the control device of convertible frequency air-conditioner oil return that the embodiment of the present invention provides can make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor, on the one hand, ensure that the lubricating oil of discharge returns compressor in time, ensure that the reliable running of compressor; On the other hand, to prevent in prior art frequency-changeable compressor when low frequency and Mid Frequency running, the bypass amount of capillary is excessive, namely refrigerant also returns compressor by capillary, the heating/freeze or the problem of hydraulic performance decline of the air-conditioning produced, improve frequency-changeable compressor when low frequency and Mid Frequency running air-conditioning heat/refrigeration performance.
Embodiment three,
Embodiments provide a kind of off-premises station 1 of convertible frequency air-conditioner, as shown in Figure 2, the off-premises station 1 of this convertible frequency air-conditioner comprises: the control device 15 of the convertible frequency air-conditioner oil return in frequency-changeable compressor 11, the oil eliminator 12, off-premises station electric expansion valve 14 and the embodiment two that are connected with this frequency-changeable compressor 11.One end of this off-premises station electric expansion valve 14 is connected with oil eliminator 12, and the other end is connected with frequency-changeable compressor 11.
Wherein, the control device 15 of convertible frequency air-conditioner oil return is for controlling the off-premises station electric expansion valve 14 in frequency-conversion air-conditioning system, this off-premises station electric expansion valve 14 has the adjustable characteristic of aperture, the lubricants capacity turned back to from the oil eliminator 12 of frequency-variable air conditioner outdoor machine 1 frequency-changeable compressor 11 just can be controlled by the opening value of the outer organic electronic expansion valve 14 of conditioning chamber, namely control the recirculating oil quantity of frequency-conversion air-conditioning system, make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor 11.
Concrete, the control method of being carried out convertible frequency air-conditioner oil return by the control device 15 of this convertible frequency air-conditioner oil return can the description of reference example one, and the embodiment of the present invention does not repeat them here.
Based on the off-premises station of the convertible frequency air-conditioner that the embodiment of the present invention provides, size due to off-premises station electronic expansion valve opening directly determines the recirculating oil quantity of frequency-conversion air-conditioning system, by increasing off-premises station electric expansion valve between frequency-changeable compressor and oil eliminator, the embodiment of the present invention is immobilized unlike the recirculating oil quantity in the air-conditioning system of prior art, but in convertible frequency air-conditioner, the recirculating oil quantity of system can be adjusted by the opening value of organic electronic expansion valve outside the control device control room of convertible frequency air-conditioner oil return.And the operating frequency of frequency-changeable compressor directly determines the oil drain quantity of frequency-conversion air-conditioning system.Detected the current operating frequency of frequency-changeable compressor by the control device of convertible frequency air-conditioner oil return, and according to the corresponding relation prestored, the opening value of electric expansion valve is adjusted to the opening value adapted with the current operating frequency of frequency-changeable compressor.The off-premises station of the convertible frequency air-conditioner that such embodiment of the present invention provides, can make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor.On the one hand, ensure that the lubricating oil of discharge returns compressor in time, ensure that the reliable running of compressor; On the other hand, to prevent in prior art frequency-changeable compressor when low frequency and Mid Frequency running, the bypass amount of capillary is excessive, namely refrigerant also returns the problem of heating/freezing of the air-conditioning that compressor produces or hydraulic performance decline by capillary, improve frequency-changeable compressor when low frequency and Mid Frequency running air-conditioning heat/refrigeration performance.
Embodiment four,
The embodiment of the present invention provides a kind of control method of convertible frequency air-conditioner oil return, is particularly applicable in the off-premises station 1 of convertible frequency air-conditioner as shown in Figure 7, and the off-premises station 1 of this convertible frequency air-conditioner comprises:
Frequency-changeable compressor 11, the oil eliminator 12 be connected with this frequency-changeable compressor 11, the capillary 16 of the control device 15 of convertible frequency air-conditioner oil return and the series connection of at least two groups and magnetic valve 17, wherein, parallel with one another between the capillary 16 of at least two group series connection and magnetic valve 17, the capillary 16 of at least two group series connection is connected with oil eliminator 12 with one end of magnetic valve 17, and the other end is connected with frequency-changeable compressor 11.
Wherein, the control device 15 of convertible frequency air-conditioner oil return is for controlling the open and close of magnetic valve 17 in frequency-conversion air-conditioning system, and then make the capillary of different length and/or quantity be in connected state, the capillary that the lubricating oil flowed out from oil eliminator 12 can be communicated with by these is got back in frequency-changeable compressor 11, thus control turns back to the lubricants capacity frequency-changeable compressor 11 from the oil eliminator 12 of frequency-variable air conditioner outdoor machine 1, namely the recirculating oil quantity of frequency-conversion air-conditioning system is controlled, make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor 11.
As shown in Figure 8, the method specifically comprises:
First operating frequency of S201, detection frequency-changeable compressor.
S202, according to the first operating frequency, in conjunction with preset strategy, control the open and close of magnetic valve in the capillary of at least two groups series connection and magnetic valve.
It should be noted that, in the embodiment of the present invention, comprise capillary 16 and the magnetic valve 17 of at least two group series connection, when the capillary 16 of connecting is different with the quantity of magnetic valve 17 and/or the length of capillary 16 is different, preset strategy may not be identical, and the embodiment of the present invention does not do concrete restriction to this.
Preferably, if off-premises station 1 comprises capillaries 16 and the magnetic valve 17 of two groups of series connection, and in the capillary 16 of wherein one group of series connection and magnetic valve 17, the length of the first capillary is greater than the length of the second capillary in the capillary 16 of other one group of series connection and magnetic valve 17, then
As shown in Figure 9, step S202 specifically comprises:
If S202a first operating frequency is less than first threshold, the first magnetic valve controlling to connect with the first capillary is opened, and second closed electromagnetic valve of connecting with the second capillary.
If S202b first operating frequency is greater than first threshold and is less than Second Threshold, control the first closed electromagnetic valve, and the second magnetic valve is opened.
If S202c first operating frequency is greater than Second Threshold, control the first magnetic valve and the second magnetic valve is opened jointly.
Specifically, the operating frequency of frequency-changeable compressor 11 is divided into low frequency, intermediate frequency, high frequency three phases by the embodiment of the present invention, when the first operating frequency is low frequency, is communicated with the longer capillary of length 16 by Controlling solenoid valve 17; When the first operating frequency is intermediate frequency, be communicated with the shorter capillary of length 16 by Controlling solenoid valve 17; When the first operating frequency is high frequency, the capillary 16 making length longer by Controlling solenoid valve 17 capillary 16 shorter with length is all communicated with.
Because the length of capillary 16 is longer, resistance is larger, less by the recirculating oil quantity of this capillary 16; On the contrary, the length of capillary 16 is shorter, and resistance is less, larger by this capillary 16 recirculating oil quantity.Further, the quantity of the capillary 16 of the parallel connection be simultaneously communicated with is more, and the recirculating oil quantity in frequency-conversion air-conditioning system is larger.And the operating frequency of frequency-changeable compressor 11 directly determines the oil drain quantity of frequency-conversion air-conditioning system.The control method of the convertible frequency air-conditioner oil return therefore provided based on the embodiment of the present invention, when the first operating frequency of frequency-changeable compressor 11 is low frequency, the lubricants capacity of discharging due to frequency-changeable compressor 11 is few, be communicated with the capillary 16 that length is longer, now the recirculating oil quantity of frequency-conversion air-conditioning system is also little, and the recirculating oil quantity therefore in frequency-conversion air-conditioning system is suitable with the lubricants capacity of discharging from frequency-changeable compressor 11; When the first operating frequency is intermediate frequency, the lubricants capacity of discharging due to frequency-changeable compressor 11 is relatively many, be communicated with the capillary 16 that length is shorter, now the recirculating oil quantity of frequency-conversion air-conditioning system is also relatively many, and the recirculating oil quantity therefore in frequency-conversion air-conditioning system is suitable with the lubricants capacity of discharging from frequency-changeable compressor 11; When the first operating frequency is high frequency, the lubricants capacity of discharging due to frequency-changeable compressor 11 is maximum, be communicated with the longer capillary 16 of length and the shorter capillary 16 of length simultaneously, recirculating oil quantity now in frequency-conversion air-conditioning system is also maximum, and the recirculating oil quantity therefore in frequency-conversion air-conditioning system is suitable with the lubricants capacity of discharging from frequency-changeable compressor 11.
The control method of the convertible frequency air-conditioner oil return that the embodiment of the present invention provides, by detecting the first operating frequency of frequency-changeable compressor, obtains the current operating frequency of frequency-changeable compressor.By this first operating frequency, in conjunction with preset strategy, control the capillary of this at least two group series connection and the open and close of magnetic valve, make the open and close of current electromagnetic valve corresponding with the current operating frequency of frequency-changeable compressor.Due to the open and close of magnetic valve, the capillary of different length and/or quantity can be made to be in connected state, directly determine the recirculating oil quantity of frequency-conversion air-conditioning system, and the operating frequency of frequency-changeable compressor directly determines the oil drain quantity of frequency-conversion air-conditioning system, therefore the control method of convertible frequency air-conditioner oil return that the embodiment of the present invention provides can make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor, on the one hand, ensure that the lubricating oil of discharge returns compressor in time, ensure that the reliable running of compressor; On the other hand, to prevent in prior art frequency-changeable compressor when low frequency and Mid Frequency running, the bypass amount of capillary is excessive, namely refrigerant also returns compressor by capillary, the heating/freeze or the problem of hydraulic performance decline of the air-conditioning produced, improve frequency-changeable compressor when low frequency and Mid Frequency running air-conditioning heat/refrigeration performance.
Embodiment five,
Embodiments provide a kind of control device 15 of convertible frequency air-conditioner oil return, be particularly applicable in the off-premises station 1 of convertible frequency air-conditioner as shown in Figure 7, for the off-premises station 1 of this convertible frequency air-conditioner, specifically can the description of Fig. 7 in reference example four, the embodiment of the present invention does not repeat them here.
As shown in Figure 10, the control device 15 of this convertible frequency air-conditioner oil return comprises: detecting unit 1001, control unit 1002.
Wherein, detecting unit 1001, for detecting the first operating frequency of frequency-changeable compressor.
Control unit 1002, for according to the first operating frequency, in conjunction with preset strategy, controls the open and close of magnetic valve in the capillary of at least two groups series connection and magnetic valve.
Preferably, if off-premises station 1 comprises capillary 16 and the magnetic valve 17 of two groups of series connection, and the length of the first capillary is greater than the length of the second capillary in the capillary 16 of other one group of series connection and magnetic valve 17 in the capillary 16 of wherein one group of series connection and magnetic valve 17, then control unit 1002 specifically for:
If the first operating frequency is less than first threshold, the first magnetic valve controlling to connect with the first capillary is opened, and second closed electromagnetic valve of connecting with the second capillary;
If the first operating frequency is greater than first threshold and is less than Second Threshold, control the first closed electromagnetic valve, and the second magnetic valve is opened;
If the first operating frequency is greater than Second Threshold, control the first magnetic valve and described second magnetic valve is opened jointly.
The control device of the convertible frequency air-conditioner oil return that the embodiment of the present invention provides, detects the first operating frequency of frequency-changeable compressor by detecting unit, obtain the current operating frequency of frequency-changeable compressor.By control unit according to this first operating frequency, in conjunction with preset strategy, control the capillary of this at least two group series connection and the open and close of magnetic valve, make the open and close of current electromagnetic valve corresponding with the current operating frequency of frequency-changeable compressor.Due to the open and close of magnetic valve, the capillary of different length and/or quantity can be made to be in connected state, directly determine the recirculating oil quantity of frequency-conversion air-conditioning system, and the operating frequency of frequency-changeable compressor directly determines the oil drain quantity of frequency-conversion air-conditioning system, therefore the control device of convertible frequency air-conditioner oil return that the embodiment of the present invention provides can make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor, on the one hand, ensure that the lubricating oil of discharge returns compressor in time, ensure that the reliable running of compressor; On the other hand, to prevent in prior art frequency-changeable compressor when low frequency and Mid Frequency running, the bypass amount of capillary is excessive, namely refrigerant also returns compressor by capillary, the heating/freeze or the problem of hydraulic performance decline of the air-conditioning produced, improve frequency-changeable compressor when low frequency and Mid Frequency running air-conditioning heat/refrigeration performance.
Embodiment six,
The embodiment of the present invention additionally provides a kind of off-premises station 1 of convertible frequency air-conditioner, and as shown in Figure 7, this off-premises station 1 comprises:
Frequency-changeable compressor 11 and the oil eliminator 12 be connected with this frequency-changeable compressor 11, also comprise the control device 15 of the convertible frequency air-conditioner oil return in the capillary of at least two groups series connection and magnetic valve and embodiment five, wherein, parallel with one another between the capillary 16 of at least two group series connection and magnetic valve 17, the capillary 16 of at least two group series connection is connected with oil eliminator 12 with one end of magnetic valve 17, and the other end is connected with frequency-changeable compressor 11.
Wherein, the control device 15 of convertible frequency air-conditioner oil return is for controlling the open and close of magnetic valve 17 in frequency-conversion air-conditioning system, by opening and closing different magnetic valves, the capillary of different length and/or quantity just can and then be made to be in connected state, the capillary that the lubricating oil flowed out from oil eliminator 12 can be communicated with by these is got back in frequency-changeable compressor 11, thus control turns back to the lubricants capacity frequency-changeable compressor 11 from the oil eliminator 12 of frequency-variable air conditioner outdoor machine 1, namely the recirculating oil quantity of frequency-conversion air-conditioning system is controlled, make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor 11.
Concrete, the control method of being carried out convertible frequency air-conditioner oil return by the control device 15 of this convertible frequency air-conditioner oil return can the description of reference example four, and the embodiment of the present invention does not repeat them here.
Due to the open and close of magnetic valve, the capillary of different length and/or quantity can be made to be in connected state, directly determine the recirculating oil quantity of frequency-conversion air-conditioning system, and the operating frequency of frequency-changeable compressor directly determines the oil drain quantity of frequency-conversion air-conditioning system, therefore the off-premises station of convertible frequency air-conditioner that the embodiment of the present invention provides can make the recirculating oil quantity in frequency-conversion air-conditioning system suitable with the lubricants capacity of discharging from frequency-changeable compressor, on the one hand, ensure that the lubricating oil of discharge returns compressor in time, ensure that the reliable running of compressor; On the other hand, to prevent in prior art frequency-changeable compressor when low frequency and Mid Frequency running, the bypass amount of capillary is excessive, namely refrigerant also returns compressor by capillary, the heating/freeze or the problem of hydraulic performance decline of the air-conditioning produced, improve frequency-changeable compressor when low frequency and Mid Frequency running air-conditioning heat/refrigeration performance.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (10)
1. the control method of a convertible frequency air-conditioner oil return, described convertible frequency air-conditioner comprises off-premises station, the oil eliminator that described off-premises station comprises frequency-changeable compressor and is connected with described frequency-changeable compressor, it is characterized in that, described off-premises station also comprises off-premises station electric expansion valve, wherein, one end of described off-premises station electric expansion valve is connected with described oil eliminator, and the other end is connected with described frequency-changeable compressor;
Described method comprises:
Detect the first operating frequency of described frequency-changeable compressor;
According to described first operating frequency, and the corresponding relation prestored, determine the first opening value of the described off-premises station electric expansion valve that described first operating frequency is corresponding, wherein, described corresponding relation is the corresponding relation of the opening value of operating frequency and described off-premises station electric expansion valve;
The opening value of described off-premises station electric expansion valve is adjusted to described first opening value.
2. method according to claim 1, is characterized in that, before the described aperture by described off-premises station electric expansion valve is adjusted to described first opening value, also comprises:
Whether the current opening value judging described off-premises station electric expansion valve is described first opening value;
The described opening value by described off-premises station electric expansion valve is adjusted to described first opening value, comprising:
If the current opening value of described off-premises station electric expansion valve is not described first opening value, the opening value of described off-premises station electric expansion valve is adjusted to described first opening value.
3. the control device of a convertible frequency air-conditioner oil return, described convertible frequency air-conditioner comprises off-premises station, the oil eliminator that described off-premises station comprises frequency-changeable compressor and is connected with described frequency-changeable compressor, it is characterized in that, described off-premises station also comprises off-premises station electric expansion valve, wherein, one end of described off-premises station electric expansion valve is connected with described oil eliminator, and the other end is connected with described frequency-changeable compressor;
The control device of described convertible frequency air-conditioner oil return comprises: detecting unit, determining unit, adjustment unit;
Described detecting unit, for detecting the first operating frequency of described frequency-changeable compressor;
Described determining unit, for according to described first operating frequency, and the corresponding relation prestored, determine the first opening value of the described off-premises station electric expansion valve that described first operating frequency is corresponding, wherein, described corresponding relation is the corresponding relation of the opening value of operating frequency and described off-premises station electric expansion valve;
Described adjustment unit, for being adjusted to described first opening value by the opening value of described off-premises station electric expansion valve.
4. the control device of convertible frequency air-conditioner oil return according to claim 3, is characterized in that, the control device of described convertible frequency air-conditioner oil return also comprises judging unit;
Described judging unit, before the opening value of described off-premises station electric expansion valve being adjusted to described first opening value at described adjustment unit, judges whether the current opening value of described off-premises station electric expansion valve is described first opening value;
Described adjustment unit specifically for:
If described judging unit judges that the current opening value of described off-premises station electric expansion valve is not described first opening value, the opening value of described off-premises station electric expansion valve is adjusted to described first opening value.
5. the off-premises station of a convertible frequency air-conditioner, the oil eliminator that described off-premises station comprises frequency-changeable compressor, is connected with described frequency-changeable compressor, it is characterized in that, described off-premises station also comprises the control device of off-premises station electric expansion valve and the convertible frequency air-conditioner oil return as described in claim 3 or 4, wherein, one end of described off-premises station electric expansion valve is connected with described oil eliminator, and the other end is connected with described frequency-changeable compressor.
6. the control method of a convertible frequency air-conditioner oil return, described convertible frequency air-conditioner comprises off-premises station, the oil eliminator that described off-premises station comprises frequency-changeable compressor and is connected with described frequency-changeable compressor, it is characterized in that, described off-premises station also comprises capillary and the magnetic valve of at least two group series connection, parallel with one another between the capillary of described at least two group series connection and magnetic valve, the capillary of described at least two group series connection is connected with described oil eliminator with one end of magnetic valve, and the other end is connected with described frequency-changeable compressor;
Described method comprises:
Detect the first operating frequency of described frequency-changeable compressor;
According to described first operating frequency, in conjunction with preset strategy, the open and close of magnetic valve in the capillary of at least two groups series connection described in control and magnetic valve.
7. method according to claim 6, it is characterized in that, if described off-premises station comprises capillary and the magnetic valve of two groups of series connection, and the length of the first capillary is greater than the length of the second capillary in the capillary of other one group of series connection and magnetic valve in the capillary of wherein one group of series connection and magnetic valve, then described according to described first operating frequency, in conjunction with preset strategy, the open and close of magnetic valve in the capillary of at least two groups series connection described in control and magnetic valve, comprising:
If described first operating frequency is less than first threshold, the first magnetic valve controlling to connect with described first capillary is opened, and second closed electromagnetic valve of connecting with described second capillary;
If described first operating frequency is greater than described first threshold and is less than Second Threshold, control described first closed electromagnetic valve, and described second magnetic valve is opened;
If described first operating frequency is greater than described Second Threshold, control described first magnetic valve and described second magnetic valve is opened jointly.
8. the control device of a convertible frequency air-conditioner oil return, described convertible frequency air-conditioner comprises off-premises station, the oil eliminator that described off-premises station comprises frequency-changeable compressor and is connected with described frequency-changeable compressor, it is characterized in that, described off-premises station also comprises capillary and the magnetic valve of at least two group series connection, parallel with one another between the capillary of described at least two group series connection and magnetic valve, the capillary of described at least two group series connection is connected with described oil eliminator with one end of magnetic valve, and the other end is connected with described frequency-changeable compressor;
The control device of described convertible frequency air-conditioner oil return comprises: detecting unit, control unit;
Described detecting unit, for detecting the first operating frequency of described frequency-changeable compressor;
Described control unit, for according to described first operating frequency, in conjunction with preset strategy, the open and close of magnetic valve in the capillary of at least two groups series connection described in control and magnetic valve.
9. the control device of convertible frequency air-conditioner oil return according to claim 8, it is characterized in that, if described off-premises station comprises capillary and the magnetic valve of two groups of series connection, and the length of the first capillary is greater than the length of the second capillary in the capillary of other one group of series connection and magnetic valve in the capillary of wherein one group of series connection and magnetic valve, then described control unit specifically for:
If described first operating frequency is less than first threshold, the first magnetic valve controlling to connect with described first capillary is opened, and second closed electromagnetic valve of connecting with described second capillary;
If described first operating frequency is greater than described first threshold and is less than Second Threshold, control described first closed electromagnetic valve, and described second magnetic valve is opened;
If described first operating frequency is greater than described Second Threshold, control described first magnetic valve and described second magnetic valve is opened jointly.
10. the off-premises station of a convertible frequency air-conditioner, the oil eliminator that described off-premises station comprises frequency-changeable compressor, is connected with described frequency-changeable compressor, it is characterized in that, described off-premises station also comprises the capillary of at least two group series connection and the control device of magnetic valve and convertible frequency air-conditioner oil return as claimed in claim 8 or 9, wherein, parallel with one another between the capillary of described at least two group series connection and magnetic valve, the capillary of described at least two group series connection is connected with described oil eliminator with one end of magnetic valve, and the other end is connected with described frequency-changeable compressor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410502501.XA CN105509367A (en) | 2014-09-26 | 2014-09-26 | Oil return control method and device and outdoor unit of variable-frequency air conditioner |
| PCT/CN2014/090794 WO2016045171A1 (en) | 2014-09-26 | 2014-11-11 | Oil-return control method, device and outdoor unit of variable-frequency air conditioner |
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| CN201410502501.XA CN105509367A (en) | 2014-09-26 | 2014-09-26 | Oil return control method and device and outdoor unit of variable-frequency air conditioner |
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| WO (1) | WO2016045171A1 (en) |
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| CN105927522A (en) * | 2016-06-03 | 2016-09-07 | 深圳市共济科技有限公司 | Oil return control method and system of speed regulating system of compressor |
| CN106152632A (en) * | 2016-06-30 | 2016-11-23 | 珠海格力电器股份有限公司 | Oil return control system and method for controlling oil return |
| CN107270588A (en) * | 2017-06-13 | 2017-10-20 | 珠海格力电器股份有限公司 | A kind of cold control method and device |
| CN109282525A (en) * | 2018-09-11 | 2019-01-29 | 青岛海信日立空调系统有限公司 | A kind of control method and device of compressor oil return |
| CN109612160A (en) * | 2018-12-11 | 2019-04-12 | 宁波奥克斯电气股份有限公司 | A kind of method for controlling oil return, device and air conditioner |
| CN111426040A (en) * | 2020-04-03 | 2020-07-17 | 广东美的暖通设备有限公司 | Air conditioner, operation control method of air conditioner, and readable storage medium |
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| CN109612160A (en) * | 2018-12-11 | 2019-04-12 | 宁波奥克斯电气股份有限公司 | A kind of method for controlling oil return, device and air conditioner |
| CN111426040A (en) * | 2020-04-03 | 2020-07-17 | 广东美的暖通设备有限公司 | Air conditioner, operation control method of air conditioner, and readable storage medium |
| CN111426040B (en) * | 2020-04-03 | 2021-12-14 | 广东美的暖通设备有限公司 | Air conditioner, operation control method of air conditioner, and readable storage medium |
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| WO2016045171A1 (en) | 2016-03-31 |
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