CN106594973A

CN106594973A - Method and device for detecting refrigerant of air-conditioning system as well as air conditioner

Info

Publication number: CN106594973A
Application number: CN201611002908.1A
Authority: CN
Inventors: 李冰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2016-11-14
Filing date: 2016-11-14
Publication date: 2017-04-26

Abstract

The invention discloses a method and a device for detecting a refrigerant of an air-conditioning system as well as an air conditioner. The method comprises the following steps: starting a compressor to work, and detecting whether a first kind of parameters meets a first preset condition or not; if the first kind of parameters meets the first preset condition, adjusting an electronic expansion valve of the air-conditioning system, and continuing to monitor whether the pipeline temperature of an evaporator meets a second preset condition or not; if the monitoring result shows that the pipeline temperature of the evaporator meets a second preset condition, keeping the opening degree of the adjusted electronic expansion valve, and adjusting the frequency of the compressor of the air-conditioning system; and if the detecting result shows that the first kind of parameters meets a third preset condition when the compressor works at the preset frequency, determining that the fault about lack of the refrigerant exists in the air-conditioning system. By adoption of the method, the device and the air conditioner, the technical problems that whether the refrigerant of the air-conditioning system is sufficient cannot be correctly determined, the refrigerating capacity is reduced when the air-conditioning systems lacks the refrigerant, and then the safety of the air-conditioning system is low can be solved.

Description

Detect method, device and the air-conditioner of the coolant of air conditioning system

Technical field

The present invention relates to air conditioning system field, in particular to a kind of method, the device of the coolant of detection air conditioning system And air-conditioner.

Background technology

In During Process of Long-term Operation, inevitably be present the situation of micro- leakage in system coupling part to air conditioning system, finally lead Cause system cold medium shortage, refrigerating capacity declines, or even occurs that the harsh conditions such as blast occur.

For above-mentioned problem, effective solution is not yet proposed at present.

The content of the invention

A kind of method of the coolant of detection air conditioning system, device and air-conditioner are embodiments provided, at least to solve Certainly cannot accurately determine whether the coolant of air conditioning system is sufficient, and in the case of cold medium shortage, refrigerating capacity can decline, so as to lead Cause the technical problem of Safety of air conditioning system difference.

A kind of one side according to embodiments of the present invention, there is provided method of the coolant of detection air conditioning system, including：Open Whether dynamic compressor operating, the first kind parameter for detecting air conditioning system meets first pre-conditioned, wherein, first kind parameter is at least Including：The line temperature of the vaporizer of air conditioning system；If the first kind parameter of air conditioning system meets the first pre-conditioned, adjustment The electric expansion valve of air conditioning system, and continuing to monitor the line temperature of vaporizer, whether to meet second pre-conditioned；If monitoring Line temperature to vaporizer meets the second pre-conditioned, aperture after keeping electric expansion valve to adjust, and adjusts air conditioning system Compressor frequency to preset frequency；And during compressor is according to preset frequency work, detect air conditioning system Whether first kind parameter meets the 3rd pre-conditioned, if the first kind parameter for detecting air conditioning system meets the 3rd default article Part, it is determined that there is the failure for lacking coolant in air conditioning system.

Further, line temperature includes：The input pipe temperature and outlet tube temperature of vaporizer, first kind parameter is at least also Including at least one following：The corresponding saturation temperature of pressure transducer, and the outer machine pressure of air conditioning system.

Further, detection air conditioning system first kind parameter whether meet first it is pre-conditioned before, methods described Also include；During control compressor reaches the very first time with first frequency operation, if a pressure be detected that sensor Saturation temperature is less than or equal to outdoor environment temperature, determines there is the failure for lacking coolant in air conditioning system.

Further, detecting the first kind parameter of air conditioning system, whether to meet first pre-conditioned including judging air conditioning system First kind parameter whether meet at least one following condition：Whether the outlet tube temperature of vaporizer is more than the first temperature value, its In, the first temperature value is the difference of return air temperature and setting value；The outlet tube temperature of vaporizer and the input pipe temperature of vaporizer Difference whether be more than the first setting value；Whether outer machine pressure is less than or equal to predetermined pressure.

Further, the electric expansion valve of air conditioning system is adjusted, and whether continue to monitor the input pipe temperature of vaporizer full Foot second it is pre-conditioned including：The aperture of electric expansion valve is turned down into predetermined step number, when control compressor operating reaches second Between during, whether the input pipe temperature for monitoring vaporizer is less than or equal to second temperature value；Or by the aperture of electric expansion valve Predetermined step number is turned down, during control compressor operating reached for the second time, if monitoring the input pipe temperature of vaporizer Degree is more than second temperature value, then adjust the aperture of electric expansion valve, and monitors whether the input pipe temperature of vaporizer is more than or equal to 3rd temperature value.

Further, after the aperture of adjustment electric expansion valve, control compressor remains on scheduled duration, and is reaching To the 3rd time during, whether the input pipe temperature for monitoring vaporizer is more than or equal to the 3rd temperature value.

Further, detecting the first kind parameter of the air conditioning system, whether to meet the 3rd pre-conditioned including detection air-conditioning Whether the first kind parameter of system meets at least one following condition：When control compressor reaches the 4th with preset frequency operation Between during, whether the saturation temperature for detecting pressure transducer is less than or equal to outdoor environment temperature；In control compressor with pre- Determine frequency operation reached for the 4th time during, judge air conditioning system first kind parameter whether meet following condition at least it One：Judge the outlet tube temperature of vaporizer whether more than or equal to the first temperature value, outlet tube temperature and the vaporizer of vaporizer Whether input pipe temperature difference is more than or equal to the second setting value, and whether outer machine pressure is less than or equal to predetermined pressure.

Further, it is determined that existing in the air conditioning system after the failure for lacking coolant, methods described also includes：If The machine stop times of air conditioning system are less than pre-determined number, resume operation automatically after the control compressor shutdown scheduled time, remove failure Signal；Otherwise, if the machine stop times of air conditioning system are accumulative to reach pre-determined number, control compressor shutdown and cannot automatically recover fortune OK.

Further, if the first kind parameter of air conditioning system is unsatisfactory for first pre-conditioned, or if monitoring vaporizer Input pipe temperature be unsatisfactory for second pre-conditioned, or preset if the first kind parameter for detecting air conditioning system is unsatisfactory for the 3rd Condition, then exit in detection air conditioning system with the presence or absence of the workflow for lacking coolant.

Another aspect according to embodiments of the present invention, additionally provides a kind of device of the coolant of detection air conditioning system, including： First detector unit, is configured to start compressor operating, detects whether the first kind parameter of air conditioning system meets first and preset Condition, wherein, first kind parameter at least includes：The line temperature of the vaporizer of air conditioning system；Monitoring means, if be configured to The first kind parameter of air conditioning system meets the first pre-conditioned, electric expansion valve of adjustment air conditioning system, and continues monitoring evaporation It is pre-conditioned whether the line temperature of device meets second；Adjustment unit, if being configured to monitor the line temperature of vaporizer Meet second pre-conditioned, keep the aperture after electric expansion valve adjustment, and adjust the frequency of the compressor of air conditioning system to pre- Determine frequency；And determining unit, it is configured to during compressor is according to preset frequency work, detect air conditioning system First kind parameter whether meet the 3rd pre-conditioned, if the first kind parameter for detecting air conditioning system meets the 3rd default article Part, it is determined that there is the failure for lacking coolant in air conditioning system.

Further, the device also includes：Second detector unit, is configured to by the first detector unit detection air-conditioning system The first kind parameter of system whether meet first it is pre-conditioned before, control compressor with first frequency operation reach the very first time During, if a pressure be detected that the saturation temperature of sensor is less than or equal to outdoor environment temperature, determines in air conditioning system and deposit Lacking the failure of coolant.

Further, the first detector unit includes sub- detector unit, and sub- detector unit is configured to judge air conditioning system Whether first kind parameter meets at least one following condition：Whether the outlet tube temperature of vaporizer is more than the first temperature value, wherein, First temperature value is the difference of return air temperature and setting value；The outlet tube temperature of vaporizer and the input pipe temperature difference of vaporizer Whether the first setting value is more than；Whether outer machine pressure is less than or equal to predetermined pressure.

Further, monitoring means include sub- monitoring means, and sub- monitoring means are configured to the aperture of electric expansion valve Predetermined step number is turned down, during control compressor operating reached for the second time, whether is the input pipe temperature of monitoring vaporizer Less than or equal to the first temperature value；Or the aperture of electric expansion valve is turned down into predetermined step number, reach second in control compressor operating During time, if monitoring that the input pipe temperature of vaporizer, more than second temperature value, adjusts opening for electric expansion valve Degree, and whether the input pipe temperature of vaporizer is monitored more than or equal to the 3rd temperature value.

Further, sub- monitoring means are configured to after the aperture of adjustment electric expansion valve, and control compressor keeps Operation scheduled duration, and during reaching for the 3rd time, whether the input pipe temperature for monitoring vaporizer is more than or equal to the 3rd Temperature value.

Further, the determining unit includes sub- determining unit, and the sub- determining unit is configured to detect air conditioning system First kind parameter whether meet at least one following condition：When control compressor reaches the 4th with preset frequency operation Between during, whether the saturation temperature for detecting pressure transducer is less than or equal to outdoor environment temperature；In control compressor with pre- Determine frequency operation reached for the 4th time during, judge air conditioning system first kind parameter whether meet following condition at least it One：Judge the outlet tube temperature of vaporizer whether more than or equal to the first temperature value, outlet tube temperature and the vaporizer of vaporizer Whether input pipe temperature difference is more than or equal to the second setting value, and whether outer machine pressure is less than or equal to predetermined pressure.

Further, the device also includes fault clearance unit, and the fault clearance unit is configured to：If the air-conditioning The machine stop times of system are less than pre-determined number, resume operation automatically after the control compressor shutdown scheduled time, remove fault-signal； Otherwise, if the machine stop times of air conditioning system are accumulative to reach pre-determined number, control compressor shutdown and cannot resume operation automatically.

Further, the device also includes exiting unit, and this exits unit and is configured to：If the first kind of air conditioning system Parameter be unsatisfactory for it is first pre-conditioned, or if the input pipe temperature of monitoring vaporizer be unsatisfactory for it is second pre-conditioned, or if The first kind parameter for detecting air conditioning system is unsatisfactory for the 3rd pre-conditioned, then exit in detection air conditioning system with the presence or absence of lacking The workflow of coolant.

Another further aspect according to embodiments of the present invention, additionally provides a kind of air-conditioner, including：Compressor；Vaporizer, including Input pipe and outlet tube；Electric expansion valve；Controller, for starting compressor operating, and is detecting the first of air conditioning system In the case that class parameter satisfaction first is pre-conditioned, electric expansion valve is adjusted, and expired if monitoring the line temperature of vaporizer Foot is second pre-conditioned, keeps the aperture after electric expansion valve adjustment, and adjusts the frequency of the compressor of air conditioning system to predetermined Frequency, during compressor is according to preset frequency work, if the first kind parameter for detecting air conditioning system meets the 3rd It is pre-conditioned, it is determined that to there is the failure for lacking coolant in air conditioning system；Wherein, first kind parameter at least includes：Air conditioning system Vaporizer line temperature.

In the embodiment of the method, device and air-conditioner of the coolant of the detection air conditioning system of the present invention, by according to machine Group carries the data of sensor feedback and is analyzed, and has reached the purpose judged coolant, it is achieved thereby that more accurate Ground judges to lack coolant, improves the stability of unit operation, and the technique effect of maintenance efficiency, and then solve cannot be accurately true Whether the coolant for determining air conditioning system is sufficient, and in the case of cold medium shortage, refrigerating capacity can decline, so as to air conditioning system can be caused to pacify The technical problem of full property difference.

Description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this Bright schematic description and description does not constitute inappropriate limitation of the present invention for explaining the present invention.In the accompanying drawings：

Fig. 1 is the schematic diagram of the method for the coolant of detection air conditioning system according to embodiments of the present invention；

Fig. 2 is the method for the coolant of the detection air conditioning system so that air conditioning system lacks fluorine as an example according to embodiments of the present invention Flow chart；

Fig. 3 is the schematic diagram of the device of the coolant of detection air conditioning system according to embodiments of the present invention；And

Fig. 4 is the block diagram of air-conditioner according to embodiments of the present invention.

Specific embodiment

In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only The embodiment of a part of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, ordinary skill people The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model of present invention protection Enclose.

It should be noted that description and claims of this specification and the term " first " in above-mentioned accompanying drawing, " Two " it is etc. the object for distinguishing similar, without for describing specific order or precedence.It should be appreciated that so using Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating here or Order beyond those of description is implemented.Additionally, term " comprising " and " having " and their any deformation, it is intended that cover Lid is non-exclusive to be included, and for example, process, method, system, product or the equipment for containing series of steps or unit is not necessarily limited to Those steps clearly listed or unit, but may include clearly not list or for these processes, method, product Or intrinsic other steps of equipment or unit.

According to embodiments of the present invention, there is provided a kind of detection air conditioning system lacks the embodiment of the method for coolant, needs explanation It is can to perform in the such as computer system of one group of computer executable instructions the step of the flow process of accompanying drawing is illustrated, And, although logical order is shown in flow charts, but in some cases, can be performed with the order being different from herein Shown or described step.

First embodiment

Fig. 1 is the schematic diagram of the method for the coolant of detection air conditioning system according to embodiments of the present invention.In order that this It is bright to be easier to understand, with reference to the particular flow sheet of scarce fluorine in the detection air conditioning system shown in Fig. 2 to the detection shown in Fig. 1 The method of the coolant of air conditioning system is described.

As shown in figure 1, the method comprises the steps：

Step S102, starts compressor operating, and whether the first kind parameter for detecting air conditioning system meets first pre-conditioned, Wherein, first kind parameter at least includes：The line temperature of the vaporizer of air conditioning system.

Air conditioning system is mainly made up of the part such as compressor, condenser, expansion valve, capillary tube, vaporizer, liquid storage cylinder.

Air conditioning system includes various technical parameters and measurement parameter, and technical parameter for example has, refrigerating capacity, refrigeration work consumption, system Heat, heat power, electric additional thermal power, air circulation, noise of indoor unit, off-premises station noise etc..Measurement parameter is by each The parameter of the detections such as sensor is planted, for example, the line temperature of the vaporizer of air conditioning system, the outer machine pressure of air conditioning system etc..

Step S104, if the first kind parameter of air conditioning system meets the first pre-conditioned, electronics of adjustment air conditioning system Expansion valve, and continuing to monitor the line temperature of vaporizer, whether to meet second pre-conditioned.

Electric expansion valve is a vitals in air conditioning system, is generally mounted between liquid storage cylinder and vaporizer, electricity Sub- expansion valve makes the liquid refrigerant of mesohigh become the moist steam of low-temp low-pressure by its throttling, and then cold-producing medium is in vaporizer Middle absorption heat reaches refrigeration, and electric expansion valve is changed come control valve flow by the degree of superheat of vaporizer end, prevented Only there is evaporator area underutilization and engine knock phenomenon.The aperture of electric expansion valve is bigger, and the liquid for flowing through it is more.

The electric expansion valve of adjustment air conditioning system can include the aperture of electric expansion valve is decreased or increased.

The line temperature of vaporizer can be monitored by temperature sensor.

Above-mentioned second pre-conditioned to can be differently configured from first pre-conditioned.

Step S106, if the line temperature for monitoring vaporizer meets the second pre-conditioned, holding electric expansion valve tune Aperture after whole, and adjust air conditioning system compressor frequency to preset frequency.

Specifically, if as shown in Fig. 2 meeting condition T₈≤T₇-t₁Or T₉≥(T₇+t₁DEG C), then as shown in step c, The aperture of electric expansion valve is remained into K₂, i.e. K=K₂, with the raising frequency speed of regulation by compressor frequency from current original frequency F₀Bring up to F₁Hz, i.e. now frequency F=F of compressor₁。

Step S108, during compressor is according to preset frequency work, detecting the first kind parameter of air conditioning system is No satisfaction the 3rd is pre-conditioned, if the first kind parameter satisfaction the 3rd for detecting air conditioning system is pre-conditioned, it is determined that air-conditioning There is the failure for lacking coolant in system.

Above-mentioned 3rd pre-conditioned to can be differently configured from first pre-conditioned and second pre-conditioned.

In the embodiment of the method for the coolant of the above-mentioned detection air conditioning system of the present invention, the biography for mainly being carried according to unit The data of sensor detection, such as electronics of the first kind parameter of line temperature of vaporizer, air conditioning system including air conditioning system The aperture of expansion valve, running frequency of compressor etc. which enhance unit being analyzed judgement to the coolant of air conditioning system The stability and maintenance efficiency of operation.

In an embodiment of the present invention, line temperature includes：The input pipe temperature and outlet tube temperature of vaporizer, the first kind Parameter also includes at least one following：The outlet tube temperature of vaporizer, the corresponding saturation temperature of pressure transducer, and air-conditioning system The outer machine pressure of system.

The corresponding saturation temperature of the line temperature of above-mentioned vaporizer, pressure transducer can be carried out by temperature sensor etc. Detection.

The outer machine pressure of above-mentioned air conditioning system can be detected by pressure transducer etc..

In an embodiment of the present invention, detecting the first kind parameter of air conditioning system, whether to meet first pre-conditioned including sentencing Whether the first kind parameter of disconnected air conditioning system meets at least one following condition：Whether the outlet tube temperature for determining vaporizer is more than First temperature value, wherein, the first temperature value is the difference of return air temperature and setting value, the outlet tube temperature of vaporizer and vaporizer Input pipe temperature difference whether be more than the first setting value, whether outer machine pressure is less than or equal to predetermined pressure.

Alternatively, may range from of setting value (1,3) DEG C, the first setting value for air conditioning system the degree of superheat, its scope Can be (0,10) DEG C.

Specifically, understand with reference to embodiment as shown in Figure 2, compressor operating started after air conditioning system is started shooting, In compressor with original frequency F₀Running time T_m0During, if detecting T₁＞ T₂, then the following condition of detection is continued (1), whether (2), (3) set up simultaneously：

T₃＞ T₄-t₁ (1)

T₃-T₅＞ T₆ (2)

P≤P1 (3)

Wherein,

T₁For the corresponding saturation temperature of current pressure sensor；

T₂For outdoor environment temperature；

T₃For evaporator output tube temperature；

T₄For return air temperature；

t₁For setting value, its may range from (1,3) DEG C；

T₅For vaporizer input pipe temperature；

T₆For the degree of superheat, its may range from (0,10) DEG C；

P is the outer machine pressure of air conditioning system；

T_m0May range from (0,5) minute, the value of pressure P1 can (2400,3000) in the range of kPa.

In an embodiment of the present invention, the electric expansion valve of air conditioning system is adjusted, and continues to monitor the input pipe of vaporizer Temperature whether meet second it is pre-conditioned including：The aperture of electric expansion valve is turned down into predetermined step number, in control compressor operating During reaching for the second time, whether the input pipe temperature of vaporizer is monitored less than or equal to second temperature value or by electronic expansion The aperture of valve turns down predetermined step number, during control compressor operating reached for the second time, if monitoring vaporizer Input pipe temperature is more than second temperature value, then adjust the aperture of electric expansion valve, and whether monitors the input pipe temperature of vaporizer More than or equal to the 3rd temperature value.

Alternatively, may range from of predetermined step number (50,300)；Second time may range from (0,5) minute；The Two temperature values are the difference of the vaporizer input pipe temperature before electronic expansion valve events and particular value, and the particular value may range from (1,3)℃；The scope of the 3rd time is (1,3) minute；3rd temperature value is the vaporizer input pipe before electronic expansion valve events Temperature and particular value sum, and may range from of the particular value (1,3) DEG C.

Specifically, if as shown in Fig. 2 above-mentioned condition (1), (2), (3) at the same set up,

As shown in step a, compressor operating restrictive condition is removed.

Then as shown in step b, the ongoing frequency of compressor is kept, electric expansion valve is turned down into K₁Step, makes compressor Running time T_m1Minute, during this period, detect whether to meet following condition (4)

T₈≤T₇-t₁ (4)

Wherein, T₈It is the input pipe temperature when front evaporator；T₇It is that electronic expansion valve events (that is, turn down K₁Step) steam before Send out the input pipe temperature of device；K₁May range from (50,300)；t₁For setting value, its may range from (1,3) DEG C；And T_m1 May range from (0,5) minute.

If condition (4) is unsatisfactory for, the aperture of electric expansion valve is reached into K on the basis of current step number₂, i.e. make Aperture K=K of electric expansion valve₂, monitor vaporizer input pipe temperature whether meet following condition (5)

T₉≥(T₇+t₁℃) (5)

Wherein, T₉It is the input pipe temperature when front evaporator, K₂May range from (300,450).

In embodiments of the present invention, after the aperture of adjustment electric expansion valve, control compressor remains on pre- Timing is long, and during reaching for the 3rd time, whether the input pipe temperature for monitoring vaporizer is more than or equal to the 3rd temperature value.

Specifically, as described above, the aperture of electric expansion valve is being adjusted to into K=K₂Afterwards, compressor is made to remain on T_m2 Minute, whether the input pipe temperature of period monitoring vaporizer meets conditions above (5).

Wherein, T_m2May range from (1,3) minute.

In an embodiment of the present invention, detecting the first kind parameter of air conditioning system, whether to meet the 3rd pre-conditioned including inspection Whether the first kind parameter for surveying air conditioning system meets at least one following condition：Reached with preset frequency operation in control compressor During 4th time, whether the saturation temperature for detecting pressure transducer is less than or equal to outdoor environment temperature；In control compression During machine reached for the 4th time with preset frequency operation, whether the first kind parameter for judging air conditioning system meets following condition At least one：Judge the outlet tube temperature of vaporizer whether more than or equal to the first temperature value, outlet tube temperature and the steaming of vaporizer Whether the input pipe temperature difference for sending out device is more than or equal to the second setting value, and whether outer machine pressure is less than or equal to predetermined pressure.

Wherein, may range from of the 4th time (2,3) minute；First temperature value for air conditioning system return air temperature with set The difference of definite value, and may range from of the setting value (1,3) DEG C；Second setting value may range from (10,15) minute.

Specifically, such as the step of Fig. 2 as shown in c, compressor is made with frequency F₁Operation T_m3Minute after, detect whether meet with Lower condition (6)

T₁₀≤T₂ (6)

Wherein, T₁₀For the corresponding saturation temperature of current pressure sensor, T₂For outdoor environment temperature, T_m3May range from (2,3) minute.

If condition (6) meets, it is determined that there is the failure for lacking coolant in air conditioning system.

If condition (6) is unsatisfactory for, further determine that whether following condition (7), (8), (9) set up simultaneously

T₁₁-T₁₂≥t₂ (7)

T₁₁≥T₁₃-t₁ (8)

P≤P1 (9)

Wherein, T₁₁For current evaporator output tube temperature, T₁₂It is as front evaporator input pipe temperature, T₁₃For current return air Temperature, t₂May range from (10,15) DEG C.

If condition (7), (8), (9) are while set up, it is determined that there is the failure for lacking coolant in air conditioning system.

Alternatively, in the above embodiment of the present invention, whether first is met in the first kind parameter of detection air conditioning system Before pre-conditioned, method can also include, during control compressor reaches the very first time with first frequency operation, such as Fruit detects the saturation temperature of pressure transducer less than or equal to outdoor environment temperature, determines that presence lacks coolant in air conditioning system Failure.

Wherein, original frequency F when first frequency is compressor start₀, may range from of the very first time (0,5) divide Clock.

Specifically, as shown in Figure 2, compressor operating is started after air conditioning system is started shooting, in compressor with initial Frequency F₀Running time T_m0During, if detecting corresponding saturation temperature T of current pressure sensor₁≤ outdoor environment temperature T₂, then step d is directly entered, determine there is the failure for lacking fluorine in air conditioning system.

Alternatively, in the above embodiment of the present invention, determine and exist in air conditioning system after the failure for lacking coolant, side Method can also include：If the machine stop times of air conditioning system are less than pre-determined number, after the control compressor shutdown scheduled time automatically Resume operation, remove fault-signal；Otherwise, if the machine stop times of air conditioning system are accumulative to reach pre-determined number, control compressor stops Machine and cannot resume operation automatically.

Wherein, may range from of pre-determined number (3, it is 5) secondary, the scheduled time can for (1,3) minute.

Specifically, such as the step of Fig. 2 as shown in d, after it is determined that there is the failure for lacking fluorine in air conditioning system, compression is closed Machine and the load of related operation.Correspondence fault cues are shown on a display screen, send chimes of doom.

Machine stop times as do not removed fault-signal and air conditioning system are less than N₁, stop T_m3Compressor recovers fortune automatically after minute OK, not by start-up study time restriction, fault-signal is removed, and electric expansion valve reaches K₃(150,250) adjust again after step Section.Wherein, N₁May range from (3,5), T_m3May range from (1,3) minute, K₃May range from (150,250).

Such as add up N₁Secondary above-mentioned protection occur, then failure can not resume operation automatically, and show correspondence fault cues, send Chimes of doom.After failure reset or power-off restarting, fault-signal is eliminated.

Embodiments in accordance with the present invention, if the first kind parameter of air conditioning system be unsatisfactory for it is first pre-conditioned, or if The input pipe temperature of monitoring vaporizer is unsatisfactory for second pre-conditioned, or if the first kind parameter for detecting air conditioning system is discontented with Foot the 3rd is pre-conditioned, then exit in detection air conditioning system with the presence or absence of the workflow for lacking coolant

Specifically, as shown in Figure 2, alternatively, if condition (1)～(3) can not set up or condition (5) is false simultaneously Or condition (7)～(9) can not set up simultaneously, then the follow-up unit of air conditioning system enters normal operation mode, while shielding fortune Scarce fluorine detection during row.

It should be understood that the coolant in air conditioning system is in addition to the freon commonly used, also including inorganic compound system Cryogen, saturated hydrocarbon cold-producing medium, saturated hydrocarbon cold-producing medium, azeotropic mixture refrigerant etc..

Although above in association with air conditioning system fluorine detection idiographic flow to the present invention detection air conditioning system coolant Method be described, but the present invention is not limited to this, the detection method of the present invention be equally applicable to in air conditioning system its The detection of his coolant.

Second embodiment

The device of the coolant of detection air conditioning system according to embodiments of the present invention is described with reference to Fig. 3.

As shown in figure 3, the device of the coolant of detection air conditioning system according to embodiments of the present invention may include：

First detector unit 202, is configured to start compressor operating, detects whether the first kind parameter of air conditioning system is full Foot first is pre-conditioned, wherein, the first kind parameter at least includes：The line temperature of the vaporizer of the air conditioning system.

Monitoring means 204, if the first kind parameter for being configured to air conditioning system meets the described first pre-conditioned, adjustment The electric expansion valve of air conditioning system, and continuing to monitor the line temperature of vaporizer, whether to meet second pre-conditioned.

Electric expansion valve is a vitals in air conditioning system, is generally mounted between liquid storage cylinder and vaporizer, electricity Sub- expansion valve makes the liquid refrigerant of mesohigh become the moist steam of low-temp low-pressure by its throttling, and then cold-producing medium is in vaporizer Middle absorption heat reaches refrigeration, and electric expansion valve, come control valve Liu amount, is prevented by the degree of superheat change of vaporizer end Only there is evaporator area underutilization and engine knock phenomenon.The aperture of electric expansion valve is bigger, and the liquid for flowing through it is more.

The line temperature of vaporizer can be monitored by temperature sensor.

Adjustment unit 206, if being configured to monitor that the line temperature of vaporizer meets the second pre-conditioned, holding electricity Aperture after the adjustment of sub- expansion valve, and adjust air conditioning system compressor frequency to preset frequency.

Specifically, if as shown in Fig. 2 meeting condition T₈≤T₇-t₁Or T₉≥(T₇+t₁DEG C), then as shown in step c, The aperture of electric expansion valve is remained K by adjustment unit 206₂, i.e. K=K₂, with specify raising frequency speed by compressor frequency from Current original frequency F₀Bring up to F₁Hz, i.e. now frequency F=F of compressor₁。

Determining unit 208, is configured to during compressor is according to preset frequency work, detect the of air conditioning system Whether one class parameter meets the 3rd pre-conditioned, if the first kind parameter for detecting air conditioning system meets the 3rd pre-conditioned, Then determine there is the failure for lacking coolant in air conditioning system.

In the embodiment of the device of the coolant of the above-mentioned detection air conditioning system of the present invention, the biography for mainly being carried according to unit The data of sensor detection, such as electronics of the first kind parameter of line temperature of vaporizer, air conditioning system including air conditioning system The aperture of expansion valve, running frequency of compressor etc. which enhance unit being analyzed judgement to the coolant of air conditioning system The stability and maintenance efficiency of operation.

In an embodiment of the present invention, line temperature includes：The input pipe temperature and outlet tube temperature of vaporizer, the first kind Parameter also includes at least one following：The corresponding saturation temperature of pressure transducer, and the outer machine pressure of air conditioning system.

According to the embodiment of the present invention, device also includes：Second detector unit, is configured to by the first detector unit Detection air conditioning system first kind parameter whether meet first it is pre-conditioned before, control compressor with first frequency operation reach To the very first time during, if a pressure be detected that the saturation temperature of sensor is less than or equal to outdoor environment temperature, it is determined that empty Lack the failure of coolant described in existing in adjusting system.

Specifically, as shown in Figure 2, compressor operating is started after air conditioning system is started shooting, in compressor with initial Frequency F₀Running time T_m0During, if the second detector unit detects corresponding saturation temperature T of current pressure sensor₁≤ Outdoor environment temperature T₂, then step d is directly entered, determine there is the failure for lacking fluorine in air conditioning system.

According to the embodiment of the present invention, the first detector unit includes sub- detector unit, and sub- detector unit is configured to sentence Whether the first kind parameter of disconnected air conditioning system meets at least one following condition：Whether the outlet tube temperature of vaporizer is more than first Temperature value, wherein, the first temperature value is the difference of return air temperature and setting value；The outlet tube temperature of vaporizer is defeated with vaporizer Whether enter pipe temperature difference more than the first setting value；Whether outer machine pressure is less than or equal to predetermined pressure.

Specifically, understand with reference to embodiment as shown in Figure 2, compressor operating started after air conditioning system is started shooting, In compressor with original frequency F₀Running time T_m0During, if detecting T₁＞ T₂, then the subelement of the first detector unit after Continuous detection detects whether following condition (1), (2), (3) set up simultaneously：

T₃＞ T₄-t₁ (1)

T₃-T₅＞ T₆ (2)

P≤P1 (3)

Wherein,

T₁For the corresponding saturation temperature of current pressure sensor；

T₂For outdoor environment temperature；

T₃For evaporator output tube temperature；

T₄For return air temperature；

t₁For setting value, its may range from (1,3) DEG C；

T₅For vaporizer input pipe temperature；

T₆For the degree of superheat, its may range from (0,10) DEG C；

P is the outer machine pressure of air conditioning system；

In an embodiment of the present invention, monitoring means 204 include sub- monitoring means, and the sub- monitoring means are configured to electricity The aperture of sub- expansion valve turns down predetermined step number, during control compressor operating reached for the second time, monitors vaporizer Whether input pipe temperature is less than or equal to second temperature value；Or the aperture of electric expansion valve is turned down into predetermined step number, in control compression During machine operation reached for the second time, if monitoring that the input pipe temperature of vaporizer, more than second temperature value, is adjusted The aperture of electric expansion valve, and whether the input pipe temperature of vaporizer is monitored more than or equal to the 3rd temperature value.

As shown in step a, compressor operating restrictive condition is removed.

T₈≤T₇-t₁ (4)

T₉≥(T₇+t₁℃) (5)

In an embodiment of the present invention, sub- monitoring means are configured to after the aperture of adjustment electric expansion valve, control Compressor remains on scheduled duration, and during reaching for the 3rd time, whether the input pipe temperature for monitoring vaporizer is big In equal to the 3rd temperature value.

Specifically, as described above, the aperture of electric expansion valve is being adjusted to into K=K₂Afterwards, compressor is made to remain on T_m2 Minute, whether the period input pipe temperature of sub- monitoring means monitoring vaporizer meets conditions above (5).

Wherein, T_m2May range from (1,3) minute.

In an embodiment of the present invention, determining unit includes sub- determining unit, and it is empty that the sub- determining unit is configured to detection Whether the first kind parameter of adjusting system meets at least one following condition：The 4th is reached in control compressor with preset frequency operation During time, whether the saturation temperature for detecting pressure transducer is less than or equal to outdoor environment temperature；Control compressor with During preset frequency operation reached for the 4th time, whether the first kind parameter for judging air conditioning system meets following condition at least One of：Judge the outlet tube temperature of vaporizer whether more than or equal to the first temperature value, the outlet tube temperature of vaporizer and vaporizer Input pipe temperature difference whether be more than or equal to the second setting value, whether outer machine pressure is less than or equal to predetermined pressure.

T₁₀≤T₂ (6)

T₁₁-T₁₂≥t₂ (7)

T₁₁≥T₁₃-t₁ (8)

P≤P1 (9)

In an embodiment of the present invention, described device also includes fault clearance unit, and the fault clearance unit is configured to If the machine stop times of air conditioning system are less than pre-determined number, resume operation automatically after the control compressor shutdown scheduled time, remove Fault-signal；Otherwise, if the machine stop times of air conditioning system are accumulative to reach pre-determined number, compressor shutdown and cannot be automatically extensive is controlled Multiple operation.

Specifically, such as the step of Fig. 2 as shown in d, after it is determined that there is the failure for lacking fluorine in air conditioning system, fault clearance Unit close compressor and the load of related operation.Correspondence fault cues are shown on a display screen, send chimes of doom.

In embodiments of the present invention, device also includes exiting unit, and this exits unit and is configured to：If air-conditioning system The first kind parameter of system is unsatisfactory for first pre-conditioned, or if the input pipe temperature of monitoring vaporizer is unsatisfactory for the second default bar Part, or if the first kind parameter for detecting air conditioning system is unsatisfactory for the 3rd pre-conditioned, then exiting in detection air conditioning system is It is no to there is the workflow for lacking coolant.

3rd embodiment

Embodiments in accordance with the present invention, with reference to Fig. 4 air-conditioner according to embodiments of the present invention is described.

Air-conditioner of the invention includes：

Compressor 402；

Vaporizer 404, including input pipe and outlet tube；

Electric expansion valve 406；And

Controller 408, for starting compressor operating, and it is pre- to meet first in the first kind parameter for detecting air conditioning system If in the case of condition, electric expansion valve is adjusted, and if the line temperature for monitoring vaporizer meets the second pre-conditioned, guarantor Hold the aperture after electric expansion valve adjustment, and adjust the frequency of the compressor of air conditioning system to preset frequency, compressor according to During preset frequency works, if the first kind parameter satisfaction the 3rd for detecting air conditioning system is pre-conditioned, it is determined that empty There is the failure for lacking coolant in adjusting system,

Wherein, first kind parameter at least includes：The line temperature of the vaporizer of air conditioning system.

In an embodiment of the present invention, controller is configured to detect whether the first kind parameter of air conditioning system meets first It is pre-conditioned whether to meet at least one following condition including the first kind parameter for judging air conditioning system：Determine the output of vaporizer Whether pipe temperature is more than the first temperature value, wherein, the first temperature value is return air temperature and the difference of setting value, the output of vaporizer Whether pipe temperature is more than the first setting value with the input pipe temperature difference of vaporizer, and whether outer machine pressure is less than or equal to pre- level pressure Power.

T₃＞ T₄-t₁ (1)

T₃-T₅＞ T₆ (2)

P≤P1 (3)

Wherein,

T₁For the corresponding saturation temperature of current pressure sensor；

T₂For outdoor environment temperature；

T₃For evaporator output tube temperature；

T₄For return air temperature；

t₁For setting value, its may range from (1,3) DEG C；

T₅For vaporizer input pipe temperature；

T₆For the degree of superheat, its may range from (0,10) DEG C；

P is the outer machine pressure of air conditioning system；

In an embodiment of the present invention, controller is configured to adjust the electric expansion valve of air conditioning system, and continues monitoring The input pipe temperature of vaporizer whether meet second it is pre-conditioned including：The aperture of electric expansion valve is turned down into predetermined step number, During control compressor operating reached for the second time, whether the input pipe temperature for monitoring vaporizer is less than or equal to second temperature The aperture of electric expansion valve is turned down predetermined step number by value, during control compressor operating reached for the second time, if Monitor that the input pipe temperature of vaporizer more than second temperature value, then adjusts the aperture of electric expansion valve, and monitor vaporizer Whether input pipe temperature is more than or equal to the 3rd temperature value.

As shown in step a, compressor operating restrictive condition is removed.

T₈≤T₇-t₁ (4)

T₉≥(T₇+t₁℃) (5)

In embodiments of the present invention, controller is configured to after the aperture of adjustment electric expansion valve, control pressure Contracting machine remains on scheduled duration, and during reaching for the 3rd time, whether the input pipe temperature for monitoring vaporizer is more than Equal to the 3rd temperature value.

Wherein, T_m2May range from (1,3) minute.

In an embodiment of the present invention, controller is configured to detect whether the first kind parameter of air conditioning system meets the 3rd Whether the pre-conditioned first kind parameter including detection air conditioning system meets at least one following condition：In control compressor with pre- Determine during frequency operation reached for the 4th time, whether the saturation temperature for detecting pressure transducer is less than or equal to outdoor environment temperature Degree；During control compressor reached for the 4th time with preset frequency operation, judging the first kind parameter of air conditioning system is It is no to meet at least one following condition：Whether the outlet tube temperature of vaporizer is judged more than or equal to the first temperature value, vaporizer Whether the input pipe temperature difference of outlet tube temperature and vaporizer is more than or equal to the second setting value, and whether outer machine pressure is less than etc. In predetermined pressure.

T₁₀≤T₂ (6)

T₁₁-T₁₂≥t₂ (7)

T₁₁≥T₁₃-t₁ (8)

P≤P1 (9)

Alternatively, in the above embodiment of the present invention, whether first is met in the first kind parameter of detection air conditioning system Before pre-conditioned, controller is configured to during control compressor reaches the very first time with first frequency operation, such as Fruit detects the saturation temperature of pressure transducer less than or equal to outdoor environment temperature, determines that presence lacks coolant in air conditioning system Failure.

Alternatively, in the above embodiment of the present invention, controller is configured to determine that to exist in air conditioning system and lacks cold After the failure of matchmaker, if the machine stop times of air conditioning system are less than pre-determined number, after the control compressor shutdown scheduled time automatically Resume operation, remove fault-signal；Otherwise, if the machine stop times of air conditioning system are accumulative to reach pre-determined number, control compressor stops Machine and cannot resume operation automatically.

As do not removed the machine stop times of fault-signal and air conditioning system less than N1, stop T_m3Compressor recovers fortune automatically after minute OK, not by start-up study time restriction, fault-signal is removed, and electric expansion valve reaches K₃(150,250) adjust again after step Section.Wherein, N₁May range from (3,5), T_m3May range from (1,3) minute, K₃May range from (150,250).

In the embodiment of the above-mentioned air-conditioner of the present invention, the data of the sensor detection for mainly being carried according to unit, example Such as include first kind parameter, the aperture of the electric expansion valve of air conditioning system, the compression of the line temperature of the vaporizer of air conditioning system Running frequency of machine etc. which enhances stability and the maintenance of unit operation being analyzed judgement to the coolant of air conditioning system Efficiency.

In the present invention, the coolant in air conditioning system is in addition to freon, also including inorganic compound cold-producing medium, saturation Hydrocarbon refrigerant, saturated hydrocarbon cold-producing medium, azeotropic mixture refrigerant etc..Therefore, the method for the present invention and Device be equally applicable to except using freon as cold-producing medium other air conditioning systems.

The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.

In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not have in certain embodiment The part of detailed description, may refer to the associated description of other embodiment.

In several embodiments provided herein, it should be understood that disclosed technology contents, can pass through other Mode is realized.Wherein, device embodiment described above is only schematic, such as the division of described unit, Ke Yiwei A kind of division of logic function, can there is an other dividing mode when actually realizing, such as multiple units or component can with reference to or Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual Between coupling or direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module Connect, can be electrical or other forms.

The unit as separating component explanation can be or may not be it is physically separate, it is aobvious as unit The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On unit.Some or all of unit therein can according to the actual needs be selected to realize the purpose of this embodiment scheme.

In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.Above-mentioned integrated list Unit both can be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.

If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or used When, during a computer read/write memory medium can be stored in.Based on such understanding, technical scheme is substantially The part for contributing to prior art in other words or all or part of the technical scheme can be in the form of software products Embody, the computer software product is stored in a storage medium, including some instructions are used so that a computer Equipment (can be personal computer, server or network equipment etc.) perform the whole of each embodiment methods described of the invention or Part steps.And aforesaid storage medium includes：USB flash disk, read only memory (ROM, Read-Only Memory), random access memory are deposited Reservoir (RAM, Random Access Memory), portable hard drive, magnetic disc or CD etc. are various can be with store program codes Medium.

The above is only the preferred embodiments of the present invention, it is noted that for those skilled in the art For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should be regarded For protection scope of the present invention.

Claims

1. it is a kind of detection air conditioning system coolant method, it is characterised in that comprise the following steps：

Start compressor operating, whether the first kind parameter for detecting air conditioning system meets first pre-conditioned, wherein, described first Class parameter at least includes：The line temperature of the vaporizer of the air conditioning system；

If the first kind parameter of the air conditioning system meets described first pre-conditioned, the electronics for adjusting the air conditioning system is swollen Swollen valve, and continuing to monitor the line temperature of the vaporizer, whether to meet second pre-conditioned；

If the line temperature for monitoring the vaporizer meets the described second pre-conditioned, holding electric expansion valve adjustment Aperture afterwards, and adjust the air conditioning system compressor frequency to preset frequency；And

During the compressor is according to preset frequency work, whether the first kind parameter of the detection air conditioning system Meet the 3rd pre-conditioned, if the first kind parameter for detecting the air conditioning system meets the described 3rd pre-conditioned, really There is the failure for lacking coolant in the fixed air conditioning system.

2. method according to claim 1, it is characterised in that the line temperature includes：The input pipe of the vaporizer Temperature and outlet tube temperature, the first kind parameter at least also includes at least one following：The corresponding saturation temperature of pressure transducer Degree, and the outer machine pressure of the air conditioning system.

3. method according to claim 2, it is characterised in that whether meet the in the first kind parameter of detection air conditioning system Before one is pre-conditioned, methods described also includes：

During the control compressor reaches the very first time with first frequency operation, if detecting the pressure sensing The saturation temperature of device is less than or equal to outdoor environment temperature, determines the failure for lacking coolant described in existing in the air conditioning system.

4. method according to claim 2, it is characterised in that whether the first kind parameter of detection air conditioning system meets first It is pre-conditioned including：

Whether the first kind parameter for judging the air conditioning system meets at least one following condition：

Whether the outlet tube temperature of the vaporizer is more than the first temperature value, wherein, first temperature value be return air temperature with The difference of setting value；

Whether the outlet tube temperature of the vaporizer is more than the first setting value with the input pipe temperature difference of the vaporizer；

Whether the outer machine pressure is less than or equal to predetermined pressure.

5. method according to claim 2, it is characterised in that

The electric expansion valve of the air conditioning system is adjusted, and continues to monitor whether the input pipe temperature of the vaporizer meets second It is pre-conditioned including：

The aperture of the electric expansion valve is turned down into predetermined step number, in the control compressor operating process of the second time is reached In, whether the input pipe temperature for monitoring the vaporizer is less than or equal to second temperature value；Or,

The aperture of the electric expansion valve is turned down into predetermined step number, in the control compressor operating process of the second time is reached In, if monitoring that the input pipe temperature of the vaporizer, more than the second temperature value, adjusts the electric expansion valve Aperture, and whether the input pipe temperature of the vaporizer is monitored more than or equal to the 3rd temperature value.

6. method according to claim 5, it is characterised in that after the aperture for adjusting the electric expansion valve, control The compressor remains on scheduled duration, and during reaching for the 3rd time, monitors the input pipe temperature of the vaporizer Whether degree is more than or equal to the 3rd temperature value.

7. method according to claim 2, it is characterised in that whether the first kind parameter of the detection air conditioning system meets 3rd it is pre-conditioned including：

Whether the first kind parameter for detecting the air conditioning system meets at least one following condition：

During the control compressor reached for the 4th time with preset frequency operation, the pressure transducer is detected Saturation temperature whether be less than or equal to outdoor environment temperature；

During the control compressor reaches the 4th time with preset frequency operation, the air-conditioning system is judged Whether the first kind parameter of system meets at least one following condition：Whether the outlet tube temperature for judging the vaporizer is more than Equal to the first temperature value, whether the outlet tube temperature of the vaporizer is more than or equal to the input pipe temperature difference of the vaporizer Whether the second setting value, the outer machine pressure is less than or equal to predetermined pressure.

8. method as claimed in any of claims 1 to 7, it is characterised in that determine in the air conditioning system and exist After lacking the failure of coolant, methods described also includes：

It is automatically extensive after the control compressor shutdown scheduled time if the machine stop times of the air conditioning system are less than pre-determined number Multiple operation, removes fault-signal；

Otherwise, if the machine stop times of the air conditioning system are accumulative to reach the pre-determined number, the compressor shutdown and nothing are controlled Method is resumed operation automatically.

9. method as claimed in any of claims 1 to 7, it is characterised in that if the first of the air conditioning system Class parameter be unsatisfactory for it is described first pre-conditioned, or if the input pipe temperature for monitoring the vaporizer to be unsatisfactory for described second pre- If condition, or if the first kind parameter for detecting the air conditioning system is unsatisfactory for the described 3rd pre-conditioned, then exit detection With the presence or absence of the workflow for lacking coolant in the air conditioning system.

10. it is a kind of detection air conditioning system coolant device, it is characterised in that include：

First detector unit, is configured to start compressor operating, and whether the first kind parameter for detecting air conditioning system meets first It is pre-conditioned, wherein, the first kind parameter at least includes：The line temperature of the vaporizer of the air conditioning system；

Monitoring means, if the first kind parameter for being configured to the air conditioning system meets the described first pre-conditioned, adjustment institute The electric expansion valve of air conditioning system is stated, and continuing to monitor the line temperature of the vaporizer, whether to meet second pre-conditioned；

Adjustment unit, if being configured to monitor that the line temperature satisfaction second of the vaporizer is pre-conditioned, keeps described Electric expansion valve adjustment after aperture, and adjust the air conditioning system compressor frequency to preset frequency；And

Determining unit, is configured to during the compressor is according to preset frequency work, detect the air-conditioning system Whether the first kind parameter of system meets the 3rd pre-conditioned, if the first kind parameter for detecting the air conditioning system meets the 3rd It is pre-conditioned, it is determined that to there is the failure for lacking coolant in the air conditioning system.

11. devices according to claim 10, it is characterised in that

The line temperature includes：The input pipe temperature and outlet tube temperature of the vaporizer, the first kind parameter is at least also Including at least one following：The corresponding saturation temperature of pressure transducer, and the outer machine pressure of the air conditioning system.

12. devices according to claim 11, it is characterised in that

Described device also includes：

Whether the second detector unit, be configured to meet in the first kind parameter that air conditioning system is detected by first detector unit Before first is pre-conditioned, during the control compressor reaches the very first time with first frequency operation, if detection Saturation temperature to the pressure transducer is less than or equal to outdoor environment temperature, determining and lacks described in exist in the air conditioning system The failure of coolant.

13. devices according to claim 11, it is characterised in that

First detector unit includes sub- detector unit, and the sub- detector unit is configured to judge the institute of the air conditioning system State whether first kind parameter meets at least one following condition：

14. devices according to claim 11, it is characterised in that

The monitoring means include sub- monitoring means, and the sub- monitoring means are configured to close the aperture of the electric expansion valve Little predetermined step number, during the control compressor operating reached for the second time, monitors the input pipe temperature of the vaporizer Whether degree is less than or equal to second temperature value；Or,

15. devices according to claim 14, it is characterised in that the sub- monitoring means are configured to adjusting the electricity After the aperture of sub- expansion valve, control the compressor and remain on scheduled duration, and during reaching for the 3rd time, prison The input pipe temperature of the vaporizer is surveyed whether more than or equal to the 3rd temperature value.

16. devices according to claim 11, it is characterised in that

The determining unit includes sub- determining unit, and the sub- determining unit is configured to detect the first kind of the air conditioning system Whether parameter meets at least one following condition：

17. devices according to any one of claim 10 to 16, it is characterised in that

Described device also includes fault clearance unit, and the fault clearance unit is configured to：

18. devices according to any one in claim 10 to 16, it is characterised in that

Described device also includes exiting unit, and the unit that exits is configured to：If the first kind parameter of the air conditioning system It is unsatisfactory for described first pre-conditioned, or if the input pipe temperature for monitoring the vaporizer is unsatisfactory for the described second default bar Part, or if the first kind parameter for detecting the air conditioning system is unsatisfactory for the described 3rd pre-conditioned, then exit detection described With the presence or absence of the workflow for lacking coolant in air conditioning system.

19. a kind of air-conditioners, it is characterised in that include：

Compressor；

Vaporizer, including input pipe and outlet tube；

Electric expansion valve；And

Controller, presets for starting the compressor operating, and meeting first in the first kind parameter for detecting air conditioning system In the case of condition, the electric expansion valve is adjusted, and if monitor that the line temperature of the vaporizer meets second and presets Condition, keeps the aperture after electric expansion valve adjustment, and adjusts the frequency of the compressor of the air conditioning system to predetermined frequency Rate, during the compressor is according to preset frequency work, if detecting described the first of the air conditioning system It is pre-conditioned that class parameter meets the 3rd, it is determined that there is the failure for lacking coolant in the air conditioning system,

Wherein, the first kind parameter at least includes：The line temperature of the vaporizer of the air conditioning system.