CN104122084A - Device and method for detecting electronic expansion valve - Google Patents

Device and method for detecting electronic expansion valve Download PDF

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Publication number
CN104122084A
CN104122084A CN201410387729.9A CN201410387729A CN104122084A CN 104122084 A CN104122084 A CN 104122084A CN 201410387729 A CN201410387729 A CN 201410387729A CN 104122084 A CN104122084 A CN 104122084A
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Prior art keywords
difference
electric expansion
expansion valve
measured
valve
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CN201410387729.9A
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CN104122084B (en
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庞彬
刘卓林
黄鸿发
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Abstract

The invention discloses a device and a method for detecting an electronic expansion valve. The device for detecting the electronic expansion valve comprises an intake valve used for inputting a compressed gas to the electronic expansion valve to be detected, an intake solenoid valve used as a switch for inputting the compressed gas to the electronic expansion valve to be detected, an exhaust solenoid valve used as a switch for outputting the compressed gas out of the electronic expansion valve to be detected, a pressure sensor used for acquiring the gas pressure value of the compressed air, and a controller used for controlling the opening or closing of the intake solenoid valve, controlling the opening or closing of the exhaust solenoid valve, controlling the pressure sensor to acquire the gas pressure value of the compressed air, and carrying out anomaly detection on the electronic expansion valve to be detected through the acquired gas pressure value of the compressed air. By virtue of the device and the method disclosed by the invention, the problem that errors are easy to cause due to manual detection for the electronic expansion valve in the related technologies is solved.

Description

Pick-up unit and method for electric expansion valve
Technical field
The present invention relates to expansion valve field, in particular to a kind of pick-up unit for electric expansion valve and method.
Background technology
Electric expansion valve can be external on air conditioning terminal machine, for regulate the liquid supply rate of evaporator according to pre-set programs.External electronic expansion valve is equivalent to a switch in air conditioning applications, only opens a part and maybe cannot open, and can greatly affect product power and performance, thereby reduce user, experiences.Whether at present, in correlation technique, generally adopt manual detection scheme to come detected electrons expansion valve qualified, its testing process is as follows:
First, electric expansion valve to be measured is placed on monitor station; Then, by the corresponding interface of the solenoid interface of electric expansion valve to be measured and pick-up unit to connecting, and by reviewer, on pick-up unit, progressively pressed the electronic expansion valve opening of 0 step, 30 steps, 250 steps, 500 steps, after electric expansion valve to be measured starts, hand is placed on to valve body and certain position, coil top, if hand is felt vibration, coil motion is qualified, if hand is not felt vibration, coil motion is defective, wherein, coil motion is defective shows that the stuck or coil of electronic expansion valve core to be measured is failure to actuate.
Above-mentioned detection scheme can only carry out partial function detection to electric expansion valve, and cannot carry out complete detection, and owing to adopting manual detection mode, easily causes error, causes testing result unstable.
For electric expansion valve being carried out to manual detection in correlation technique, easily cause the problem of error, effective solution is not yet proposed at present.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of pick-up unit for electric expansion valve and method, to solve in correlation technique, electric expansion valve is carried out to manual detection, easily causes the problem of error.
To achieve these goals, according to an aspect of the present invention, provide a kind of pick-up unit for electric expansion valve.This device comprises: gas admittance valve, for inputting pressure gas to electric expansion valve to be measured; Air inlet electromagnetic valve, has the first air intake opening and the first gas outlet, and wherein, the first air intake opening is connected to gas admittance valve, and the first gas outlet is used for being connected to electric expansion valve to be measured, and air inlet electromagnetic valve is for inputting the switch of electric expansion valve to be measured as pressure gas; The solenoid valve of giving vent to anger, has the second air intake opening and the second gas outlet, and wherein, the second air intake opening is used for being connected to electric expansion valve to be measured, and the solenoid valve of giving vent to anger is for exporting the switch of electric expansion valve to be measured as pressure gas; Pressure transducer, for gathering the atmospheric pressure value of pressure gas; And controller, be connected to air inlet electromagnetic valve, give vent to anger solenoid valve and pressure transducer, for controlling the unlatching of air inlet electromagnetic valve or closing, control give vent to anger solenoid valve unlatching or close, controlled pressure sensor gathers the atmospheric pressure value of pressure gas, and by the atmospheric pressure value of the pressure gas that collects, electric expansion valve to be measured is carried out to abnormality detection.
Further, pressure transducer comprises: the first pressure transducer, for being connected between air inlet electromagnetic valve and electric expansion valve to be measured, and gathers the atmospheric pressure value of the pressure gas of air inlet side; And second pressure transducer, for being connected to, give vent to anger between solenoid valve and electric expansion valve to be measured, and gather the atmospheric pressure value of the pressure gas of the side of giving vent to anger, wherein, the first pressure transducer and the second pressure transducer are all connected to controller.
Further, controller also for: at gas admittance valve, during to electric expansion valve to be measured input pressure gas, controller is used for controlling air inlet electromagnetic valve and opens; The control closed electromagnetic valve of giving vent to anger; Control the atmospheric pressure value that the first pressure transducer gathers the pressure gas of air inlet side; Control the give vent to anger atmospheric pressure value of pressure gas of side of the second pressure transducer collection; And whether the atmospheric pressure value of pressure gas of air inlet side and the atmospheric pressure value of the pressure gas of the side of giving vent to anger that judgement collects reach the first preset value simultaneously, wherein, if judge the atmospheric pressure value of the pressure gas of the air inlet side collecting, reach the first preset value with the atmospheric pressure value of the pressure gas of the side of giving vent to anger simultaneously, electric expansion valve to be measured is carried out to abnormality detection.
Further, controller comprises for electric expansion valve to be measured is carried out to abnormality detection: controller is used for controlling air inlet electromagnetic valve and cuts out; Controlling the spool of electric expansion valve to be measured closes; Control the first pressure transducer and gather the first atmospheric pressure value constantly first; Control the second pressure transducer and gather the second atmospheric pressure value constantly first; Control the first pressure transducer and gather the 3rd atmospheric pressure value constantly second; Control the second pressure transducer and gather the 4th atmospheric pressure value constantly second; Calculate the first difference of the 3rd atmospheric pressure value and the first atmospheric pressure value; Calculate the second difference of the 4th atmospheric pressure value and the second atmospheric pressure value; And according to the first difference and the second difference, electric expansion valve to be measured is carried out to abnormality detection.
Further, controller comprises for electric expansion valve to be measured being carried out to abnormality detection according to the first difference and the second difference: controller is used for judging whether the first difference and the second difference are all greater than the second preset value; If judge the first difference and the second difference is all greater than the second preset value, determine that electric expansion valve to be measured exists Leakage Gas fault; And/or judge whether the first difference and the second difference are all less than the 3rd preset value; If judge the first difference and the second difference, be all less than the 3rd preset value, determine that electric expansion valve to be measured is normal.
Further, controller is for after carrying out abnormality detection according to the first difference and the second difference to electric expansion valve to be measured, also for: control the spool of electric expansion valve to be measured in the first aperture; Control air inlet electromagnetic valve is opened; The control solenoid valve of giving vent to anger is opened; Control the first pressure transducer and gather the 5th atmospheric pressure value constantly the 3rd; Control the second pressure transducer and gather the 6th atmospheric pressure value constantly the 3rd; Control the spool of electric expansion valve to be measured in the second aperture; Control the first pressure transducer and gather the 7th atmospheric pressure value constantly the 4th; Control the second pressure transducer and gather the 8th atmospheric pressure value constantly the 4th; Calculate the 3rd difference of the 7th atmospheric pressure value and the 5th atmospheric pressure value; Calculate the 4th difference of the 8th atmospheric pressure value and the 6th atmospheric pressure value; And according to the 3rd difference and the 4th difference, electric expansion valve to be measured is carried out to abnormality detection.
Further, controller comprises for electric expansion valve to be measured being carried out to abnormality detection according to the 3rd difference and the 4th difference: controller is used for judging whether the 3rd difference and the 4th difference are all less than the 4th preset value; If judge the 3rd difference and the 4th difference is all less than the 4th preset value, determine that electric expansion valve to be measured exists spool not fasten fault; If judge the 3rd difference and the 4th difference is equal to the 4th preset value, determine that electric expansion valve to be measured exists valve body plugging fault; And/or judge whether the 3rd difference and the 4th difference are all greater than the 5th preset value; If judge the 3rd difference and the 4th difference is all greater than the 5th preset value, determine that electric expansion valve to be measured is normal.
Further, this pick-up unit also comprises: blowdown valve, be connected to gas admittance valve, and for the pressure gas in input gas admittance valve, carry out pressure release processing, obtain the pressure gas after pressure release, and the pressure gas after pressure release is inputed in electric expansion valve to be measured; And the 3rd pressure transducer, be connected between air inlet electromagnetic valve and blowdown valve, for gathering the atmospheric pressure value of the pressure gas after pressure release.
Further, this pick-up unit also comprises: in gas admittance valve, be provided with device for drying and filtering, device for drying and filtering carries out dehumidification treatments for the pressure gas in input gas admittance valve; And/or exhaust box, be connected to the solenoid valve of giving vent to anger, for carry out noise reduction process when giving vent to anger the pressure gas of solenoid valve output.
Further, pick-up unit comprises one or more detection branches, wherein, each detection branches has air inlet electromagnetic valve, give vent to anger solenoid valve and pressure transducer, each detection branches is for detection of corresponding electric expansion valve to be measured, and this pick-up unit also comprises: retaining valve, has first end and the second end, first end is connected to gas admittance valve, and retaining valve inputs to the to be measured electric expansion valve corresponding with each detection branches for controlling pressure gas by gas admittance valve is unidirectional; And gas-liquid separator, be connected between the air inlet electromagnetic valve in retaining valve and each detection branches, for the pressure gas of retaining valve output is branched to each detection branches.
To achieve these goals, according to a further aspect in the invention, provide a kind of detection method for electric expansion valve.The method comprises: control gas admittance valve to electric expansion valve input pressure gas to be measured; Control the unlatching of air inlet electromagnetic valve or close, wherein, air inlet electromagnetic valve has the first air intake opening and the first gas outlet, and the first air intake opening is connected to gas admittance valve, the first gas outlet is used for being connected to electric expansion valve to be measured, and air inlet electromagnetic valve is the switch that pressure gas is inputted electric expansion valve to be measured; Control give vent to anger solenoid valve unlatching or close, wherein, the solenoid valve of giving vent to anger has the second air intake opening and the second gas outlet, wherein, the second air intake opening is used for being connected to electric expansion valve to be measured, the solenoid valve of giving vent to anger is the switch that pressure gas is exported electric expansion valve to be measured; Controlled pressure sensor gathers the atmospheric pressure value of pressure gas; And by the atmospheric pressure value of the pressure gas that collects, electric expansion valve to be measured is carried out to abnormality detection.
Further, pressure transducer comprises the first pressure transducer and the second pressure transducer, wherein, at gas admittance valve, after electric expansion valve input pressure gas to be measured, controls air inlet electromagnetic valve and opens; The control closed electromagnetic valve of giving vent to anger; Control the atmospheric pressure value that the first pressure transducer gathers the pressure gas of air inlet side, wherein, the first pressure transducer is used for being connected between air inlet electromagnetic valve and electric expansion valve to be measured; Control the give vent to anger atmospheric pressure value of pressure gas of side of the second pressure transducer collection, wherein, the second pressure transducer is used for being connected to gives vent to anger between solenoid valve and electric expansion valve to be measured; Whether the atmospheric pressure value of the pressure gas of the atmospheric pressure value of the pressure gas of the air inlet side that judgement collects and the side of giving vent to anger reaches the first preset value simultaneously; And if the atmospheric pressure value of pressure gas and the atmospheric pressure value of pressure gas of the side of giving vent to anger of judging the air inlet side collecting reach the first preset value simultaneously, electric expansion valve to be measured is carried out to abnormality detection.
Further, electric expansion valve to be measured being carried out to abnormality detection comprises: control air inlet electromagnetic valve and close; Controlling the spool of electric expansion valve to be measured closes; Control the first pressure transducer and gather the first atmospheric pressure value constantly first; Control the second pressure transducer and gather the second atmospheric pressure value constantly first; Control the first pressure transducer and gather the 3rd atmospheric pressure value constantly second; Control the second pressure transducer and gather the 4th atmospheric pressure value constantly second; Calculate the first difference of the 3rd atmospheric pressure value and the first atmospheric pressure value; Calculate the second difference of the 4th atmospheric pressure value and the second atmospheric pressure value; And according to the first difference and the second difference, electric expansion valve to be measured is carried out to abnormality detection.
Further, according to the first difference and the second difference, electric expansion valve to be measured being carried out to abnormality detection comprises: judge whether the first difference and the second difference are all greater than the second preset value; If judge the first difference and the second difference is all greater than the second preset value, determine that electric expansion valve to be measured exists Leakage Gas fault; And/or judge whether the first difference and the second difference are all less than the 3rd preset value; If judge the first difference and the second difference, be all less than the 3rd preset value, determine that electric expansion valve to be measured is normal.
Further, after electric expansion valve to be measured being carried out to abnormality detection according to the first difference and the second difference, detection method also comprises: control the spool of electric expansion valve to be measured in the first aperture; Control air inlet electromagnetic valve is opened; The control solenoid valve of giving vent to anger is opened; Control the first pressure transducer and gather the 5th atmospheric pressure value constantly the 3rd; Control the second pressure transducer and gather the 6th atmospheric pressure value constantly the 3rd; Control the spool of electric expansion valve to be measured in the second aperture; Control the first pressure transducer and gather the 7th atmospheric pressure value constantly the 4th; Control the second pressure transducer and gather the 8th atmospheric pressure value constantly the 4th; Calculate the 3rd difference of the 7th atmospheric pressure value and the 5th atmospheric pressure value; Calculate the 4th difference of the 8th atmospheric pressure value and the 6th atmospheric pressure value; And according to the 3rd difference and the 4th difference, electric expansion valve to be measured is carried out to abnormality detection.
Further, according to the 3rd difference and the 4th difference, electric expansion valve to be measured being carried out to abnormality detection comprises: judge whether the 3rd difference and the 4th difference are all less than the 4th preset value; If judge the 3rd difference and the 4th difference is all less than the 4th preset value, determine that electric expansion valve to be measured exists spool not fasten fault; If judge the 3rd difference and the 4th difference is equal to the 4th preset value, determine that electric expansion valve to be measured exists valve body plugging fault; And/or judge whether the 3rd difference and the 4th difference are all greater than the 5th preset value; If judge the 3rd difference and the 4th difference is all greater than the 5th preset value, determine that electric expansion valve to be measured is normal.
By the present invention, adopt gas admittance valve, for inputting pressure gas to electric expansion valve to be measured; Air inlet electromagnetic valve, has the first air intake opening and the first gas outlet, and wherein, the first air intake opening is connected to gas admittance valve, and the first gas outlet is used for being connected to electric expansion valve to be measured, and air inlet electromagnetic valve is for inputting the switch of electric expansion valve to be measured as pressure gas; The solenoid valve of giving vent to anger, has the second air intake opening and the second gas outlet, and wherein, the second air intake opening is used for being connected to electric expansion valve to be measured, and the solenoid valve of giving vent to anger is for exporting the switch of electric expansion valve to be measured as pressure gas; Pressure transducer, for gathering the atmospheric pressure value of pressure gas; And controller, be connected to air inlet electromagnetic valve, give vent to anger solenoid valve and pressure transducer, for controlling the unlatching of air inlet electromagnetic valve or closing, control give vent to anger solenoid valve unlatching or close, controlled pressure sensor gathers the atmospheric pressure value of pressure gas, and by the atmospheric pressure value of the pressure gas that collects, electric expansion valve to be measured is carried out to abnormality detection, solved in correlation technique electric expansion valve has been carried out to manual detection, easily cause the problem of error, and then reached the effect of automatic detected electrons expansion valve.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the pick-up unit for electric expansion valve of the embodiment of the present invention; And
Fig. 2 is according to the process flow diagram of the detection method for electric expansion valve of the embodiment of the present invention.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
In order to make those skilled in the art better understand the present invention program, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, rather than whole embodiment.Embodiment based in the present invention, does not make the every other embodiment obtaining under creative work prerequisite those of ordinary skills, all should belong to protection scope of the present invention.
It should be noted that, the term " first " in instructions of the present invention and claims and above-mentioned accompanying drawing, " second " etc. are for distinguishing similar object, and needn't be for describing specific order or precedence.The data that should be appreciated that such use suitably can exchanged in situation, so as embodiments of the invention described herein can with except diagram here or describe those order enforcement.In addition, term " comprises " and " having " and their any distortion, is intended to be to cover not exclusive comprising.
According to embodiments of the invention, a kind of pick-up unit for electric expansion valve is provided, should be whether qualified for detection of electric expansion valve to be measured for the pick-up unit of electric expansion valve.
Fig. 1 is according to the schematic diagram of the pick-up unit for electric expansion valve of the embodiment of the present invention.
As shown in Figure 1, this device comprises: gas admittance valve 100, air inlet electromagnetic valve 102, the solenoid valve 104 of giving vent to anger, pressure transducer 106 and controller 108.
Gas admittance valve 100 can be for inputting pressure gas to electric expansion valve to be measured, that is, pressure gas can be by gas admittance valve 100 input electric expansion valve to be measured.Wherein, it should be noted that, electric expansion valve to be measured can be the external parts on air conditioning terminal machine, and the specified pressure of pressure gas can be 0.5～0.7Mpa.
Air inlet electromagnetic valve 102 can have the first air intake opening and the first gas outlet, and wherein, the first air intake opening is connected to gas admittance valve 100, and when whether detection electric expansion valve to be measured is qualified, the first gas outlet can be for being connected to the first end of electric expansion valve to be measured.Air inlet electromagnetic valve 102 can be for inputting the switch of electric expansion valve to be measured as pressure gas.Wherein, when air inlet electromagnetic valve 102 is opened, pressure gas can input to by the pipeline of pick-up unit in electric expansion valve to be measured; When air inlet electromagnetic valve 102 is closed, pressure gas cannot input to by the pipeline of pick-up unit in electric expansion valve to be measured.
The solenoid valve 104 of giving vent to anger can have the second air intake opening and the second gas outlet, and wherein, when whether detection electric expansion valve to be measured is qualified, the second air intake opening can be for being connected to the second end of electric expansion valve to be measured.Giving vent to anger solenoid valve 104 can be for exporting the switch of electric expansion valve to be measured as pressure gas.Wherein, when the solenoid valve 104 of giving vent to anger is opened, pressure gas can be exported by the pipeline of pick-up unit from electric expansion valve to be measured; When the solenoid valve 104 of giving vent to anger cuts out, pressure gas cannot be exported by the pipeline of pick-up unit from electric expansion valve to be measured.
Pressure transducer 106 can, for gathering the atmospheric pressure value of pressure gas, after gathering the atmospheric pressure value of pressure gas, can be stored in corresponding storer.It should be noted that, pressure transducer 106 can comprise one or two (Fig. 1 take two pressure transducers illustrate as example), and wherein, when pressure transducer 106 comprises two, pick-up unit can be realized dual pressure sensor and detect.Two pressure transducers can be arranged on the two ends of electric expansion valve to be measured, avoid using single pressure transducer to lose efficacy and cause continuing detecting, and using dual sensor to contribute to contrast in real time the atmospheric pressure value of both sides.
When pressure transducer 106 only comprises one, when whether detection electric expansion valve to be measured is qualified, it can be connected between air inlet electromagnetic valve 102 and electric expansion valve to be measured, and particularly, its one end can be connected to electric expansion valve to be measured by the first rapid-acting coupling; Or it can be connected to gives vent to anger between solenoid valve 104 and electric expansion valve to be measured, particularly, its one end can be connected to electric expansion valve to be measured by the second rapid-acting coupling.
When pressure transducer 106 comprises two, when whether detection electric expansion valve to be measured is qualified, a pressure transducer can be connected between air inlet electromagnetic valve 102 and electric expansion valve to be measured, and particularly, its one end can be connected to electric expansion valve to be measured by the first rapid-acting coupling; Another pressure transducer can be connected to gives vent to anger between solenoid valve 104 and electric expansion valve to be measured, and particularly, its one end can be connected to electric expansion valve to be measured by the second rapid-acting coupling.
Controller 108 can be connected to air inlet electromagnetic valve 102, give vent to anger solenoid valve 104 and pressure transducer 106, it can be for controlling the unlatching of air inlet electromagnetic valve 102 or closing, control give vent to anger solenoid valve 104 unlatching or close, controlled pressure sensor 106 gathers the atmospheric pressure value of pressure gass, and by the atmospheric pressure value of the pressure gas that collects, electric expansion valve to be measured is carried out to abnormality detection.Wherein, electric expansion valve to be measured being carried out to abnormality detection comprises multiple leak source abnormality detection, stops up abnormality detection and spool and the abnormality detection such as whether do not fasten.
For example, the pressure transducer 106 of take comprises that two as example, when whether detection electric expansion valve to be measured is qualified, when gas admittance valve 100 has been inputted a certain amount of pressure gas to electric expansion valve to be measured, if controlling air inlet electromagnetic valve 102 all closes with the solenoid valve 104 of giving vent to anger, and control two pressure transducers simultaneously and gather the atmospheric pressure value of the pressure gas of side separately two different moment, can compare respectively each pressure transducer and judge in size or more above-mentioned two difference of data and differences of preset value that constantly collect of above-mentioned two data that do not collect in the same time simultaneously whether electric expansion valve to be measured exists leak source abnormal, if control air inlet electromagnetic valve 102 and the solenoid valve 104 of giving vent to anger is all opened, can judge whether electric expansion valve to be measured exists by similar mode and stop up abnormal and spool and whether do not fasten etc. extremely, again repeat no more.
It should be noted that, in embodiments of the present invention, electric expansion valve to be measured can represent with A, as shown in Figure 1.
In the embodiment of the present invention, because the pre-set programs in controller can be controlled gas admittance valve, air inlet electromagnetic valve, the solenoid valve of giving vent to anger, pressure transducer etc. be according to this pre-set programs auto-action, therefore, reached the effect of automatic detected electrons expansion valve, can break away from manual detection, thereby can avoid causing error, make testing result more accurate, stable.
Preferably, in embodiments of the present invention, pressure transducer 106 can comprise: the first pressure transducer 1062 and the second pressure transducer 1064, as shown in Figure 1.Wherein, detecting electric expansion valve to be measured when whether qualified, the first pressure transducer 1062 can be for being connected between air inlet electromagnetic valve 102 and electric expansion valve to be measured, and it can be for gathering the atmospheric pressure value of the pressure gas of air inlet side.The second pressure transducer 1064 can be given vent to anger between solenoid valve 104 and electric expansion valve to be measured for being connected to, and it can be for gathering the atmospheric pressure value of the pressure gas of the side of giving vent to anger.
It should be noted that, two pressure transducers can be under the control of controller 108, not in the same time, and when air inlet electromagnetic valve 102 and the solenoid valve 104 of giving vent to anger are in different duty separately, gather respectively the atmospheric pressure value of the pressure gas of side separately, and preserve it.Wherein, the first pressure transducer 1062 and the second pressure transducer 1064 are all connected to controller 108.
By the embodiment of the present invention, because dual pressure sensor can gather respectively the pressure gas atmospheric pressure value of electric expansion valve to be measured both sides simultaneously, therefore, can be in time, accurately regular inspection is surveyed electric expansion valve to be measured and whether occurred aforementioned fault.
Preferably, in embodiments of the present invention, controller 108 can also move for control aforesaid each parts by following steps, and carries out corresponding fault detection capability:
S2, when gas admittance valve is inputted pressure gas to electric expansion valve to be measured, controller can be opened for controlling air inlet electromagnetic valve 102.
S4, controls the solenoid valve 104 of giving vent to anger and closes.
S6, controls the atmospheric pressure value that the first pressure transducer gathers the pressure gas of air inlet side.
S8, controls the give vent to anger atmospheric pressure value of pressure gas of side of the second pressure transducer collection.
S10, whether the atmospheric pressure value of the pressure gas of the atmospheric pressure value of the pressure gas of the air inlet side that judgement collects and the side of giving vent to anger reaches the first preset value simultaneously.
S12 reaches the first preset value if judge the atmospheric pressure value of the pressure gas of the air inlet side collecting with the atmospheric pressure value of the pressure gas of the side of giving vent to anger simultaneously, electric expansion valve to be measured is carried out to abnormality detection.
By carrying out S2～S12, when electric expansion valve to be measured is carried out to abnormality detection, can in electric expansion valve to be measured, input the satisfied pre-conditioned pressure gas of the first preset value of a certain amount of atmospheric pressure value, for example, can be by closing the solenoid valve 104 open air inlet electromagnetic valve 102 and input pressure gas in electric expansion valve to be measured of giving vent to anger, until the atmospheric pressure value of electric expansion valve internal compressed gas to be measured is while arriving pressurize setting value 0.5Mpa, start electric expansion valve to be measured to carry out abnormality detection, wherein, can carry out pressurize leak source abnormality detection to electric expansion valve to be measured, stop up abnormality detection and spool and the abnormality detection such as whether do not fasten.For example, when the atmospheric pressure value of electric expansion valve internal compressed gas to be measured arrives pressurize setting value 0.5Mpa, can first carry out pressurize leak source abnormality detection, stop up again abnormality detection and spool and the abnormality detection such as whether do not fasten, or can first stop up abnormality detection and spool and the abnormality detection such as whether not fasten, then carry out pressurize leak source abnormality detection.Wherein, first carry out pressurize leak source abnormality detection, then stop up abnormality detection and spool and the abnormality detection such as whether do not fasten and can save detection time, improve detection efficiency, below take this detection sequentially as example describes in detail.
Preferably, in embodiments of the present invention, controller 108 can be for carrying out pressurize leak source abnormality detection by following steps to electric expansion valve to be measured:
S14, controller is used for controlling air inlet electromagnetic valve and cuts out.
S16, controls the spool of electric expansion valve to be measured and closes.
S18, controls the first pressure transducer and gathers the first atmospheric pressure value constantly first.
S20, controls the second pressure transducer and gathers the second atmospheric pressure value constantly first.
S22, controls the first pressure transducer and gathers the 3rd atmospheric pressure value constantly second.
S24, controls the second pressure transducer and gathers the 4th atmospheric pressure value constantly second.
S26, the first difference of calculating the 3rd atmospheric pressure value and the first atmospheric pressure value.
S28, the second difference of calculating the 4th atmospheric pressure value and the second atmospheric pressure value.
S30, carries out abnormality detection according to the first difference and the second difference to electric expansion valve to be measured.
Wherein, carry out S14 and S16, can be so that the aforesaid pressure gas that meets certain pressure value be locked in the signal piping at electric expansion valve to be measured place, like this, can judge whether electric expansion valve to be measured leaks gas by being arranged on the situation of change of the atmospheric pressure value that the pressure transducer of these electric expansion valve to be measured both sides collects constantly at former and later two respectively, that is, judge whether electric expansion valve to be measured exists leak source abnormal.Wherein, when the atmospheric pressure value in electric expansion valve to be measured remains unchanged, determine that electric expansion valve to be measured is normal, when the atmospheric pressure value in electric expansion valve to be measured changes, illustrate and have gas leak phenomenon, thereby determine that electric expansion valve to be measured is abnormal, that is there is leak source in electric expansion valve to be measured.It should be noted that, the leak source of electric expansion valve to be measured is to be caused by reasons such as the solder joint welding on electric expansion valve to be measured are shaky extremely.
Particularly, controller can comprise for electric expansion valve to be measured being carried out to aforesaid leak source abnormality detection according to the first difference and the second difference:
S32, controller is used for judging whether the first difference and the second difference are all greater than the second preset value.
S34, if judge the first difference and the second difference is all greater than the second preset value, determines that electric expansion valve to be measured exists Leakage Gas fault.
S36, judges whether the first difference and the second difference are all less than the 3rd preset value.
S38, if judge the first difference and the second difference is all less than the 3rd preset value, determines that electric expansion valve to be measured is normal.
It should be noted that, in embodiments of the present invention, can only carry out S32 and S34, or can carry out S32～S38, or can only carry out S36 and S38.
Preferably, in embodiments of the present invention, controller 108 is for after carrying out pressurize leak source abnormality detection according to the first difference and the second difference to electric expansion valve to be measured, can also the abnormality detection such as whether not fasten for it being stopped up to abnormality detection and spool:
S40, controls the spool of electric expansion valve to be measured in the first aperture.
S42, controls air inlet electromagnetic valve and opens.
S44, controls the solenoid valve of giving vent to anger and opens.
S46, controls the first pressure transducer and gathers the 5th atmospheric pressure value constantly the 3rd.
S48, controls the second pressure transducer and gathers the 6th atmospheric pressure value constantly the 3rd.
S50, controls the spool of electric expansion valve to be measured in the second aperture.
S52, controls the first pressure transducer and gathers the 7th atmospheric pressure value constantly the 4th.
S54, controls the second pressure transducer and gathers the 8th atmospheric pressure value constantly the 4th.
S56, the 3rd difference of calculating the 7th atmospheric pressure value and the 5th atmospheric pressure value.
S58, the 4th difference of calculating the 8th atmospheric pressure value and the 6th atmospheric pressure value.
S60, carries out abnormality detection according to the 3rd difference and the 4th difference to electric expansion valve to be measured.
In embodiments of the present invention, by open air inlet electromagnetic valve and the solenoid valve of giving vent to anger simultaneously, can carry out pump-down process to electric expansion valve to be measured, wherein, in exhaust process, can be by the spool of electric expansion valve to be measured is got in different apertures, and the pressure transducer of controlling both sides gathers corresponding atmospheric pressure value in particular moment, and then by the atmospheric pressure value collecting, judge whether electric expansion valve to be measured exists and stop up abnormal and spool and do not fasten etc. extremely.
Preferably, in embodiments of the present invention, controller can comprise for electric expansion valve to be measured being carried out to abnormality detection according to the 3rd difference and the 4th difference:
S62, controller is used for judging whether the 3rd difference and the 4th difference are all less than the 4th preset value.
S64, if judge the 3rd difference and the 4th difference is all less than the 4th preset value, determines that electric expansion valve to be measured exists spool not fasten fault.
S66, if judge the 3rd difference and the 4th difference is equal to the 4th preset value, determines that electric expansion valve to be measured exists spool plugging fault.
S68, judges whether the 3rd difference and the 4th difference are all greater than the 5th preset value.
S70, if judge the 3rd difference and the 4th difference is all greater than the 5th preset value, determines that electric expansion valve to be measured is normal.
It should be noted that, in embodiments of the present invention, can only carry out S62 and S66, or can carry out S62～S70, or can only carry out S68 and S70.
Preferably, in embodiments of the present invention, this pick-up unit can also comprise: blowdown valve 110 and the 3rd pressure transducer 112, as shown in Figure 1.
Blowdown valve 110 is connected to gas admittance valve, and it can carry out pressure release processing for the pressure gas in input gas admittance valve 100, obtains the pressure gas after pressure release, and the pressure gas after pressure release is inputed in electric expansion valve to be measured.For example, its specified detected pressures is 0.5-0.7Mpa, and when overstepping the extreme limit 1.6Mpa, blowdown valve 110 can releasing pressure automatically, assurance system and personal security.
The 3rd pressure transducer 112 is connected between air inlet electromagnetic valve 102 and blowdown valve 110, for gathering the atmospheric pressure value of the pressure gas after pressure release, thereby detect this atmospheric pressure value, whether meets specified conditions.
Preferably, in embodiments of the present invention, as shown in Figure 1, gas admittance valve 100 is interior can be provided with device for drying and filtering 1002, and device for drying and filtering carries out dehumidification treatments for the pressure gas in input gas admittance valve 100.For example, device for drying and filtering 1002 can filter moisture, oil and other impurity etc. in pressure gas.
Preferably, in embodiments of the present invention, as shown in Figure 1, this pick-up unit can also comprise: exhaust box 114.Exhaust box 114 is connected to the solenoid valve 104 of giving vent to anger, and it can be for carrying out noise reduction process when giving vent to anger the pressure gas of solenoid valve 104 outputs.Wherein, when electric expansion valve to be measured has detected, in the process of releasing compressed gas, noise is larger, by adopting exhaust box 114, has reached the effect of falling.
Preferably, in embodiments of the present invention, this pick-up unit can comprise one or more detection branches, wherein, each detection branches has air inlet electromagnetic valve, give vent to anger solenoid valve and pressure transducer, each detection branches can be for detection of corresponding electric expansion valve to be measured, the situation of the Shi Youyige branch going out as shown in Figure 1.This pick-up unit can also comprise: retaining valve 116 and gas-liquid separator 118.
Retaining valve 116 has first end and the second end, and first end is connected to gas admittance valve 100, and retaining valve 116 can input in the electric expansion valve to be measured corresponding with each detection branches by gas admittance valve 100 is unidirectional for controlling pressure gas.Adopt retaining valve 116 can prevent that pressurized air from refluxing, cause other detection branches pressure transient, and system erroneous judgement etc.As shown in Figure 1.
Gas-liquid separator 118 can be connected between the air inlet electromagnetic valve in retaining valve 116 and each detection branches, for the pressure gas of retaining valve 116 outputs is branched to each detection branches.It should be noted that, gas-liquid separator 118 can carry out secondary filtration to pressurized air, and in addition, gas-liquid separator 118 has gas storage effect, is mainly used in air-flow inspection plugging function.As shown in Figure 1.
For example, whole pick-up unit can comprise startup system group and automatic control system group, wherein, startup system group can be locked the also nozzle position of sealed electronic expansion valve front-end and back-end by rapid-acting coupling, and by the control mouth of the coil connectors of electric expansion valve and automatic control system group to connecting, finally control start key and press, start to detect.Now, automatic control system group execution control function complete abnormality detection:
Particularly, automatic control system group is controlled the closed electromagnetic valve of giving vent to anger, and air inlet electromagnetic valve is opened, and pressurized air starts to enter gas admittance valve.When the side atmospheric pressure value of giving vent to anger that the air inlet side atmospheric pressure value collecting when the first pressure transducer and the second pressure transducer collect reaches pressurize setting value 0.5Mpa simultaneously, control air inlet electromagnetic valve is closed, controlling the spool of electric expansion valve closes, the pressurize that starts to carry out 30 seconds detects, now, control the first pressure transducer and again gather air inlet side atmospheric pressure value and control the second pressure transducer and again gather the side atmospheric pressure value of giving vent to anger, and preserve it.Detect after 30 seconds, control the first pressure transducer and the second pressure transducer and in the time of the 30th second, gather again once the atmospheric pressure value of corresponding side, then, the atmospheric pressure value gathering before and after each pressure transducer is contrasted, when the difference that gathers for the first time numerical value in the numerical value gathering for the second time and each leisure when two pressure transducers is greater than 0.002Kpa, determine that electric expansion valve is defective, and its inside exists leak source, this Time Controller can be carried out alarm, for example, control when red, meanwhile, show that product is defective; When the difference that gathers for the first time numerical value in the numerical value gathering for the second time and each leisure when two pressure transducers is less than 0.003Kpa, control green light, meanwhile, demonstration product is qualified.
After pressurize has detected, can control air inlet electromagnetic valve and all open with the solenoid valve of giving vent to anger, thereby enter stifled detection of air-flow inspection in next link.Particularly, the coil that can control electric expansion valve closes spool to 0 step state, wherein, 0 step state is the first aperture, then aforesaid two solenoid valve full open, controlling aforesaid two pressure transducers gathers the atmospheric pressure value of corresponding site and preserves it, then the spool of electric expansion valve to be measured is opened to maximum 500 steps, and exit 10 seconds, afterwards, control the atmospheric pressure value that aforesaid two pressure transducers gather corresponding site again, and the atmospheric pressure value respectively two pressure transducers being collected for twice in front and back contrasts, obtain comparing result.If comparing result shows each pressure transducer and be greater than the atmospheric pressure value gathering at rear time at the atmospheric pressure value last time gathering, electric expansion valve is defective, and fault to be that spool closes not tight; If comparing result shows that each pressure transducer is at the atmospheric pressure value last time gathering and basic identical at the atmospheric pressure value of rear collection, electric expansion valve is defective, and fault is that valve body half is stifled or entirely stifled; Comparing result shows that each pressure transducer is greater than at the atmospheric pressure value of rear collection the more than 20 times of atmospheric pressure value that gathered last time, and electric expansion valve is qualified.
It should be noted that, in embodiments of the present invention, pick-up unit can comprise display control interface and operating platform.Wherein, display control interface is for showing testing result, adjust detecting pattern, checking the visualized operation interface of detecting data.Operating platform is the operating table surface of clamping MUT module under test (being electric expansion valve to be measured), patch cord, open detection device.
Display control interface mainly can be divided into three parts, is respectively display interface, pilot lamp and upper electrical switch.Further, display interface can divide three interfaces, is respectively testing result interface, detects interface, detected parameters interface are set.Testing result interface has comprised two piths that detect, be respectively the result of pressurize leak detection, electric expansion valve open detection, when upper electrical switch is opened, display interface is defaulted as testing result interface, during detection, show that result is defaulted as " NG ", after having detected, and testing result shows " OK " when qualified, shows " NG " when defective.
Upper electrical switch is used for controlling the power supply of a plurality of stations of whole pick-up unit (being many detection branch).
Operating platform mainly can be divided into three parts, is respectively winding wiring mouth, electric expansion valve clamping working table to be measured, detects start button.Wherein, the connection jaws of the coil that winding wiring mouth is electric expansion valve, one group has 6 interfaces, two of stations, one of them is standby; Electric expansion valve clamping working table to be measured is the operating platform of electric expansion valve docking clamping to be measured.Electric expansion valve to be measured is used joint to carry out clamping, and according to electric expansion valve pipeline specification to be measured, joint, to there being two kinds of specifications (∮ 8, ∮ 12), can need to switch according to the caliber of electric expansion valve to be measured in use; Detecting start button is double startup button, and must press two buttons could start detection simultaneously.
Particularly, when upper electrical switch is opened, screen display to be shown is shown testing result interface.Electric expansion valve is carried out to clamping, can first clamping inlet end joint, rear docking outlet side joint, finally by coil and connection jaws to connecting.Then, control double startup button presses simultaneously, start to detect, wherein, comprise pressurize leak detection, jam detection etc., after having detected, in display screen, show testing result, simultaneously according to testing result, control alarm indicator light on and off, in two detections any one or two defective, control red led bright with alarm, otherwise it is bright to control green indicating lamp.When any one or more appearance are defective in many detection branches, control the pilot lamp of this group and can light with alarm.
For thering is the pick-up unit of a plurality of detection branches, when detecting an electric expansion valve to be measured, can interface be set by detection and carry out unnecessary detection branches shielding.
Pass through the above embodiment of the present invention, when pre-installing, electric expansion valve increased airtight leak detection operation, can detect electric expansion valve because the welding leak source causing not in place is abnormal, and the valve body that causes of other reasons stops up, spool closes not tight etc. extremely, has reached the effect of automatic detected electrons expansion valve.
According to embodiments of the invention, a kind of detection method for electric expansion valve is provided, should be whether qualified for detection of electric expansion valve to be measured for the pick-up unit of electric expansion valve for the detection method of electric expansion valve.Should may operate in computer-processing equipment for the detection method of electric expansion valve.It should be noted that, the detection method for electric expansion valve that the embodiment of the present invention provides can be carried out by the pick-up unit for electric expansion valve of the embodiment of the present invention, and the pick-up unit for electric expansion valve of the embodiment of the present invention also can be for carrying out the detection method for electric expansion valve of the embodiment of the present invention.
It should be noted that, the hardware platform that method part adapts to is identical with device part, does not repeat them here.
Fig. 2 is according to the process flow diagram of the detection method for electric expansion valve of the embodiment of the present invention.
As shown in Figure 2, the method comprises that following step S202 is to step S210:
Step S202, controls gas admittance valve to electric expansion valve input pressure gas to be measured.
Pressure gas can be inputted in electric expansion valve to be measured by gas admittance valve.Wherein, it should be noted that, electric expansion valve to be measured can be the external parts on air conditioning terminal machine, and the specified pressure of pressure gas can be 0.5～0.7Mpa.
Step S204, controls the unlatching of air inlet electromagnetic valve or closes.
Wherein, air inlet electromagnetic valve has the first air intake opening and the first gas outlet, and the first air intake opening is connected to gas admittance valve, and the first gas outlet is used for being connected to electric expansion valve to be measured, and air inlet electromagnetic valve is the switch that pressure gas is inputted electric expansion valve to be measured.Wherein, when air inlet electromagnetic valve is opened, pressure gas can input to by the pipeline of pick-up unit in electric expansion valve to be measured; When air inlet electromagnetic valve is closed, pressure gas cannot input to by the pipeline of pick-up unit in electric expansion valve to be measured.
Step S206, controls the unlatching of the solenoid valve of giving vent to anger or closes.
Wherein, the solenoid valve of giving vent to anger has the second air intake opening and the second gas outlet, and wherein, the second air intake opening is used for being connected to electric expansion valve to be measured, and the solenoid valve of giving vent to anger is the switch that pressure gas is exported electric expansion valve to be measured.Wherein, when the solenoid valve of giving vent to anger is opened, pressure gas can be exported by the pipeline of pick-up unit from electric expansion valve to be measured; When giving vent to anger closed electromagnetic valve, pressure gas cannot be exported by the pipeline of pick-up unit from electric expansion valve to be measured.
Step S208, controlled pressure sensor gathers the atmospheric pressure value of pressure gas.
After gathering the atmospheric pressure value of pressure gas, can be stored in corresponding storer.It should be noted that, pressure transducer can comprise one or two, and wherein, when pressure transducer comprises two, pick-up unit can be realized dual pressure sensor and detect.Two pressure transducers can be arranged on the two ends of electric expansion valve to be measured, avoid using single pressure transducer to lose efficacy and cause continuing detecting, and using dual sensor to contribute to contrast in real time the atmospheric pressure value of both sides.
When pressure transducer only comprises one, when whether detection electric expansion valve to be measured is qualified, it can be connected between air inlet electromagnetic valve and electric expansion valve to be measured, and particularly, its one end can be connected to electric expansion valve to be measured by the first rapid-acting coupling; Or it can be connected to gives vent to anger between solenoid valve and electric expansion valve to be measured, particularly, its one end can be connected to electric expansion valve to be measured by the second rapid-acting coupling.Wherein, the first rapid-acting coupling and the second rapid-acting coupling are not shown in Fig. 1.
When pressure transducer comprises two, when whether detection electric expansion valve to be measured is qualified, a pressure transducer can be connected between air inlet electromagnetic valve and electric expansion valve to be measured, and particularly, its one end can be connected to electric expansion valve to be measured by the first rapid-acting coupling; Another pressure transducer can be connected to gives vent to anger between solenoid valve and electric expansion valve to be measured, and particularly, its one end can be connected to electric expansion valve to be measured by the second rapid-acting coupling.
Step S210, the atmospheric pressure value by the pressure gas that collects carries out abnormality detection to electric expansion valve to be measured.
Wherein, can to above steps, control by controller, controller can be connected to air inlet electromagnetic valve, give vent to anger solenoid valve and pressure transducer, it can be for controlling the unlatching of air inlet electromagnetic valve or closing, control give vent to anger solenoid valve unlatching or close, controlled pressure sensor gathers the atmospheric pressure value of pressure gas, and by the atmospheric pressure value of the pressure gas that collects, electric expansion valve to be measured is carried out to abnormality detection.Wherein, electric expansion valve to be measured being carried out to abnormality detection comprises multiple leak source abnormality detection, stops up abnormality detection and spool and the abnormality detection such as whether do not fasten.
For example, the pressure transducer of take comprises that two as example, when whether detection electric expansion valve to be measured is qualified, when gas admittance valve has been inputted a certain amount of pressure gas to electric expansion valve to be measured, if controlling air inlet electromagnetic valve all closes with the solenoid valve of giving vent to anger, and control two pressure transducers simultaneously and gather the atmospheric pressure value of the pressure gas of side separately two different moment, can compare respectively each pressure transducer and judge in size or more above-mentioned two difference of data and differences of preset value that constantly collect of above-mentioned two data that do not collect in the same time simultaneously whether electric expansion valve to be measured exists leak source abnormal, if control air inlet electromagnetic valve and the solenoid valve of giving vent to anger is all opened, can judge whether electric expansion valve to be measured exists by similar mode and stop up abnormal and spool and whether do not fasten etc. extremely, again repeat no more.
In the embodiment of the present invention, because the pre-set programs in controller can be controlled gas admittance valve, air inlet electromagnetic valve, the solenoid valve of giving vent to anger, pressure transducer etc. be according to this pre-set programs auto-action, therefore, reached the effect of automatic detected electrons expansion valve, can break away from manual detection, thereby can avoid causing error, make testing result more accurate, stable.
Preferably, in embodiments of the present invention, pressure transducer can comprise the first pressure transducer and the second pressure transducer, wherein, can move for control aforesaid each parts by following steps, and carry out corresponding fault detection capability: at gas admittance valve, after electric expansion valve input pressure gas to be measured, control air inlet electromagnetic valve and open; The control closed electromagnetic valve of giving vent to anger; Control the atmospheric pressure value that the first pressure transducer gathers the pressure gas of air inlet side, wherein, the first pressure transducer is used for being connected between air inlet electromagnetic valve and electric expansion valve to be measured; Control the give vent to anger atmospheric pressure value of pressure gas of side of the second pressure transducer collection, wherein, the second pressure transducer is used for being connected to gives vent to anger between solenoid valve and electric expansion valve to be measured; Whether the atmospheric pressure value of the pressure gas of the atmospheric pressure value of the pressure gas of the air inlet side that judgement collects and the side of giving vent to anger reaches the first preset value simultaneously; And if the atmospheric pressure value of pressure gas and the atmospheric pressure value of pressure gas of the side of giving vent to anger of judging the air inlet side collecting reach the first preset value simultaneously, electric expansion valve to be measured is carried out to abnormality detection.
When electric expansion valve to be measured is carried out to abnormality detection, can in electric expansion valve to be measured, input the satisfied pre-conditioned pressure gas of the first preset value of a certain amount of atmospheric pressure value, for example, can be by closing the solenoid valve open air inlet electromagnetic valve and input pressure gas in electric expansion valve to be measured of giving vent to anger, until the atmospheric pressure value of electric expansion valve internal compressed gas to be measured is while arriving pressurize setting value 0.5Mpa, start electric expansion valve to be measured to carry out abnormality detection, wherein, can carry out pressurize leak source abnormality detection to electric expansion valve to be measured, stop up abnormality detection and spool and the abnormality detection such as whether do not fasten.For example, when the atmospheric pressure value of electric expansion valve internal compressed gas to be measured arrives pressurize setting value 0.5Mpa, can first carry out pressurize leak source abnormality detection, stop up again abnormality detection and spool and the abnormality detection such as whether do not fasten, or can first stop up abnormality detection and spool and the abnormality detection such as whether not fasten, then carry out pressurize leak source abnormality detection.Wherein, first carry out pressurize leak source abnormality detection, then stop up abnormality detection and spool and the abnormality detection such as whether do not fasten and can save detection time, improve detection efficiency, below take this detection sequentially as example describes in detail.
Further, in embodiments of the present invention, electric expansion valve to be measured is carried out to abnormality detection can be comprised: control air inlet electromagnetic valve and close; Controlling the spool of electric expansion valve to be measured closes; Control the first pressure transducer and gather the first atmospheric pressure value constantly first; Control the second pressure transducer and gather the second atmospheric pressure value constantly first; Control the first pressure transducer and gather the 3rd atmospheric pressure value constantly second; Control the second pressure transducer and gather the 4th atmospheric pressure value constantly second; Calculate the first difference of the 3rd atmospheric pressure value and the first atmospheric pressure value; Calculate the second difference of the 4th atmospheric pressure value and the second atmospheric pressure value; And according to the first difference and the second difference, electric expansion valve to be measured is carried out to abnormality detection.
Further, in embodiments of the present invention, according to the first difference and the second difference, electric expansion valve to be measured being carried out to abnormality detection can comprise: judge whether the first difference and the second difference are all greater than the second preset value; If judge the first difference and the second difference is all greater than the second preset value, determine that electric expansion valve to be measured exists Leakage Gas fault; And/or judge whether the first difference and the second difference are all less than the 3rd preset value; If judge the first difference and the second difference, be all less than the 3rd preset value, determine that electric expansion valve to be measured is normal.
Preferably, in embodiments of the present invention, after electric expansion valve to be measured being carried out to abnormality detection according to the first difference and the second difference, this detection method can also comprise: control the spool of electric expansion valve to be measured in the first aperture; Control air inlet electromagnetic valve is opened; The control solenoid valve of giving vent to anger is opened; Control the first pressure transducer and gather the 5th atmospheric pressure value constantly the 3rd; Control the second pressure transducer and gather the 6th atmospheric pressure value constantly the 3rd; Control the spool of electric expansion valve to be measured in the second aperture; Control the first pressure transducer and gather the 7th atmospheric pressure value constantly the 4th; Control the second pressure transducer and gather the 8th atmospheric pressure value constantly the 4th; Calculate the 3rd difference of the 7th atmospheric pressure value and the 5th atmospheric pressure value; Calculate the 4th difference of the 8th atmospheric pressure value and the 6th atmospheric pressure value; And according to the 3rd difference and the 4th difference, electric expansion valve to be measured is carried out to abnormality detection.
Preferably, in embodiments of the present invention, according to the 3rd difference and the 4th difference, electric expansion valve to be measured being carried out to abnormality detection can comprise: judge whether the 3rd difference and the 4th difference are all less than the 4th preset value; If judge the 3rd difference and the 4th difference is all less than the 4th preset value, determine that electric expansion valve to be measured exists spool not fasten fault; If judge the 3rd difference and the 4th difference is equal to the 4th preset value, determine that electric expansion valve to be measured exists spool plugging fault; And/or judge whether the 3rd difference and the 4th difference are all greater than the 5th preset value; If judge the 3rd difference and the 4th difference is all greater than the 5th preset value, determine that electric expansion valve to be measured is normal.
It should be noted that, the detailed introduction of the content of method part, with the content in aforesaid device part, does not repeat them here.
It should be noted that, in the step shown in the process flow diagram of accompanying drawing, can in the computer system such as one group of computer executable instructions, carry out, and, although there is shown logical order in flow process, but in some cases, can carry out shown or described step with the order being different from herein.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in memory storage and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (16)

1. for a pick-up unit for electric expansion valve, it is characterized in that, comprising:
Gas admittance valve, for inputting pressure gas to electric expansion valve to be measured;
Air inlet electromagnetic valve, have the first air intake opening and the first gas outlet, wherein, described the first air intake opening is connected to described gas admittance valve, described the first gas outlet is used for being connected to described electric expansion valve to be measured, and described air inlet electromagnetic valve is for the switch as the described electric expansion valve to be measured of pressure gas input;
The solenoid valve of giving vent to anger, has the second air intake opening and the second gas outlet, and wherein, described the second air intake opening is used for being connected to described electric expansion valve to be measured, described in give vent to anger solenoid valve for the switch as the described electric expansion valve to be measured of pressure gas output;
Pressure transducer, for gathering the atmospheric pressure value of pressure gas; And
Controller, be connected to described air inlet electromagnetic valve, described in give vent to anger solenoid valve and described pressure transducer, for controlling the unlatching of described air inlet electromagnetic valve or closing, described in control, give vent to anger solenoid valve unlatching or close, control the atmospheric pressure value that described pressure transducer gathers pressure gas, and by the atmospheric pressure value of the pressure gas that collects, described electric expansion valve to be measured is carried out to abnormality detection.
2. pick-up unit according to claim 1, is characterized in that, described pressure transducer comprises:
The first pressure transducer, for being connected between described air inlet electromagnetic valve and described electric expansion valve to be measured, and gathers the atmospheric pressure value of the pressure gas of air inlet side; And
The second pressure transducer is given vent to anger between solenoid valve and described electric expansion valve to be measured described in being connected to, and gathers the atmospheric pressure value of the pressure gas of the side of giving vent to anger,
Wherein, described the first pressure transducer and described the second pressure transducer are all connected to described controller.
3. pick-up unit according to claim 2, is characterized in that, described controller also for:
When described gas admittance valve is inputted pressure gas to described electric expansion valve to be measured, described controller is used for controlling described air inlet electromagnetic valve and opens;
The closed electromagnetic valve of giving vent to anger described in control;
Control the atmospheric pressure value that described the first pressure transducer gathers the pressure gas of described air inlet side;
Control the atmospheric pressure value of the pressure gas of the side of giving vent to anger described in described the second pressure transducer collection; And
The atmospheric pressure value of the pressure gas of the described air inlet side that collects of judgement and described in the give vent to anger atmospheric pressure value of pressure gas of side whether reach the first preset value simultaneously,
Wherein, if judge the described air inlet side collecting pressure gas atmospheric pressure value and described in the give vent to anger atmospheric pressure value of pressure gas of side reach described the first preset value simultaneously, described electric expansion valve to be measured is carried out to abnormality detection.
4. pick-up unit according to claim 3, is characterized in that, described controller comprises for described electric expansion valve to be measured is carried out to abnormality detection:
Described controller is used for controlling described air inlet electromagnetic valve and cuts out;
Controlling the spool of described electric expansion valve to be measured closes;
Control described the first pressure transducer and gather the first atmospheric pressure value constantly first;
Control described the second pressure transducer and gather the second atmospheric pressure value constantly described first;
Control described the first pressure transducer and gather the 3rd atmospheric pressure value constantly second;
Control described the second pressure transducer and gather the 4th atmospheric pressure value constantly described second;
Calculate the first difference of described the 3rd atmospheric pressure value and described the first atmospheric pressure value;
Calculate the second difference of described the 4th atmospheric pressure value and described the second atmospheric pressure value; And
According to described the first difference and described the second difference, described electric expansion valve to be measured is carried out to abnormality detection.
5. pick-up unit according to claim 4, is characterized in that, described controller comprises for described electric expansion valve to be measured being carried out to abnormality detection according to described the first difference and described the second difference:
Described controller is used for judging whether described the first difference and described the second difference are all greater than the second preset value;
If judge described the first difference and described the second difference is all greater than described the second preset value, determine that described electric expansion valve to be measured exists Leakage Gas fault;
And/or
Judge whether described the first difference and described the second difference are all less than the 3rd preset value;
If judge described the first difference and described the second difference, be all less than described the 3rd preset value, determine that described electric expansion valve to be measured is normal.
6. pick-up unit according to claim 4, is characterized in that, described controller is for after carrying out abnormality detection according to described the first difference and described the second difference to described electric expansion valve to be measured, also for:
Control the spool of described electric expansion valve to be measured in the first aperture;
Controlling described air inlet electromagnetic valve opens;
The solenoid valve of giving vent to anger described in control is opened;
Control described the first pressure transducer and gather the 5th atmospheric pressure value constantly the 3rd;
Control described the second pressure transducer and gather the 6th atmospheric pressure value constantly the described the 3rd;
Control the spool of described electric expansion valve to be measured in the second aperture;
Control described the first pressure transducer and gather the 7th atmospheric pressure value constantly the 4th;
Control described the second pressure transducer and gather the 8th atmospheric pressure value constantly the described the 4th;
Calculate the 3rd difference of described the 7th atmospheric pressure value and described the 5th atmospheric pressure value;
Calculate the 4th difference of described the 8th atmospheric pressure value and described the 6th atmospheric pressure value; And
According to described the 3rd difference and described the 4th difference, described electric expansion valve to be measured is carried out to abnormality detection.
7. pick-up unit according to claim 6, is characterized in that, described controller comprises for described electric expansion valve to be measured being carried out to abnormality detection according to described the 3rd difference and described the 4th difference:
Described controller is used for judging whether described the 3rd difference and described the 4th difference are all less than the 4th preset value;
If judge described the 3rd difference and described the 4th difference is all less than described the 4th preset value, determine that described electric expansion valve to be measured exists spool not fasten fault;
If judge described the 3rd difference and described the 4th difference is equal to described the 4th preset value, determine that described electric expansion valve to be measured exists valve body plugging fault;
And/or
Judge whether described the 3rd difference and described the 4th difference are all greater than the 5th preset value;
If judge described the 3rd difference and described the 4th difference is all greater than described the 5th preset value, determine that described electric expansion valve to be measured is normal.
8. pick-up unit according to claim 1, is characterized in that, also comprises:
Blowdown valve, is connected to described gas admittance valve, for the pressure gas of inputting in described gas admittance valve is carried out to pressure release processing, obtains the pressure gas after pressure release, and the pressure gas after described pressure release is inputed in described electric expansion valve to be measured; And
The 3rd pressure transducer, is connected between described air inlet electromagnetic valve and described blowdown valve, for gathering the atmospheric pressure value of the pressure gas after described pressure release.
9. pick-up unit according to claim 1, is characterized in that, also comprises:
In described gas admittance valve, be provided with device for drying and filtering, described device for drying and filtering is for carrying out dehumidification treatments to the pressure gas of inputting in described gas admittance valve; And/or
Exhaust box, the solenoid valve of giving vent to anger described in being connected to, carries out noise reduction process during for pressure gas in the described solenoid valve output of giving vent to anger.
10. pick-up unit according to claim 1, it is characterized in that, described pick-up unit comprises one or more detection branches, wherein, each detection branches have described air inlet electromagnetic valve, described in give vent to anger solenoid valve and described pressure transducer, described each detection branches is for detection of corresponding electric expansion valve described to be measured, and described pick-up unit also comprises:
Retaining valve, has first end and the second end, and described first end is connected to described gas admittance valve, and described retaining valve inputs to the described to be measured electric expansion valve corresponding with described each detection branches for controlling pressure gas by described gas admittance valve is unidirectional; And
Gas-liquid separator, is connected between the described air inlet electromagnetic valve in described retaining valve and described each detection branches, for the pressure gas of retaining valve output is branched to described each detection branches.
11. 1 kinds of detection methods for electric expansion valve, is characterized in that, comprising:
Control gas admittance valve to electric expansion valve input pressure gas to be measured;
Control the unlatching of air inlet electromagnetic valve or close, wherein, described air inlet electromagnetic valve has the first air intake opening and the first gas outlet, described the first air intake opening is connected to described gas admittance valve, described the first gas outlet is used for being connected to described electric expansion valve to be measured, and described air inlet electromagnetic valve is the switch of the described electric expansion valve to be measured of pressure gas input;
Control give vent to anger solenoid valve unlatching or close, wherein, described in the solenoid valve of giving vent to anger there is the second air intake opening and the second gas outlet, wherein, described the second air intake opening is used for being connected to described electric expansion valve to be measured, described in the solenoid valve of giving vent to anger be the switch of the described electric expansion valve to be measured of pressure gas output;
Controlled pressure sensor gathers the atmospheric pressure value of pressure gas; And
Atmospheric pressure value by the pressure gas that collects carries out abnormality detection to described electric expansion valve to be measured.
12. detection methods according to claim 11, is characterized in that, described pressure transducer comprises the first pressure transducer and the second pressure transducer, wherein,
At described gas admittance valve, after described electric expansion valve input pressure gas to be measured, control described air inlet electromagnetic valve and open;
The closed electromagnetic valve of giving vent to anger described in control;
Control the atmospheric pressure value that described the first pressure transducer gathers the pressure gas of air inlet side, wherein, described the first pressure transducer is used for being connected between described air inlet electromagnetic valve and described electric expansion valve to be measured;
Control the give vent to anger atmospheric pressure value of pressure gas of side of described the second pressure transducer collection, wherein, described in described the second pressure transducer is used for being connected to, give vent to anger between solenoid valve and described electric expansion valve to be measured;
The atmospheric pressure value of the pressure gas of the air inlet side that collects of judgement and described in the give vent to anger atmospheric pressure value of pressure gas of side whether reach the first preset value simultaneously; And
If judge the described air inlet side collecting pressure gas atmospheric pressure value and described in the give vent to anger atmospheric pressure value of pressure gas of side reach described the first preset value simultaneously, described electric expansion valve to be measured is carried out to abnormality detection.
13. detection methods according to claim 12, is characterized in that, described electric expansion valve to be measured is carried out to abnormality detection and comprise:
Controlling described air inlet electromagnetic valve closes;
Controlling the spool of described electric expansion valve to be measured closes;
Control described the first pressure transducer and gather the first atmospheric pressure value constantly first;
Control described the second pressure transducer and gather the second atmospheric pressure value constantly described first;
Control described the first pressure transducer and gather the 3rd atmospheric pressure value constantly second;
Control described the second pressure transducer and gather the 4th atmospheric pressure value constantly described second;
Calculate the first difference of described the 3rd atmospheric pressure value and described the first atmospheric pressure value;
Calculate the second difference of described the 4th atmospheric pressure value and described the second atmospheric pressure value; And
According to described the first difference and described the second difference, described electric expansion valve to be measured is carried out to abnormality detection.
14. detection methods according to claim 13, is characterized in that, according to described the first difference and described the second difference, described electric expansion valve to be measured are carried out to abnormality detection and comprise:
Judge whether described the first difference and described the second difference are all greater than the second preset value;
If judge described the first difference and described the second difference is all greater than described the second preset value, determine that described electric expansion valve to be measured exists Leakage Gas fault;
And/or
Judge whether described the first difference and described the second difference are all less than the 3rd preset value;
If judge described the first difference and described the second difference, be all less than described the 3rd preset value, determine that described electric expansion valve to be measured is normal.
15. detection methods according to claim 13, is characterized in that, after described electric expansion valve to be measured being carried out to abnormality detection according to described the first difference and described the second difference, described detection method also comprises:
Control the spool of described electric expansion valve to be measured in the first aperture;
Controlling described air inlet electromagnetic valve opens;
The solenoid valve of giving vent to anger described in control is opened;
Control described the first pressure transducer and gather the 5th atmospheric pressure value constantly the 3rd;
Control described the second pressure transducer and gather the 6th atmospheric pressure value constantly the described the 3rd;
Control the spool of described electric expansion valve to be measured in the second aperture;
Control described the first pressure transducer and gather the 7th atmospheric pressure value constantly the 4th;
Control described the second pressure transducer and gather the 8th atmospheric pressure value constantly the described the 4th;
Calculate the 3rd difference of described the 7th atmospheric pressure value and described the 5th atmospheric pressure value;
Calculate the 4th difference of described the 8th atmospheric pressure value and described the 6th atmospheric pressure value; And
According to described the 3rd difference and described the 4th difference, described electric expansion valve to be measured is carried out to abnormality detection.
16. detection methods according to claim 15, is characterized in that, according to described the 3rd difference and described the 4th difference, described electric expansion valve to be measured are carried out to abnormality detection and comprise:
Judge whether described the 3rd difference and described the 4th difference are all less than the 4th preset value;
If judge described the 3rd difference and described the 4th difference is all less than described the 4th preset value, determine that described electric expansion valve to be measured exists spool not fasten fault;
If judge described the 3rd difference and described the 4th difference is equal to described the 4th preset value, determine that described electric expansion valve to be measured exists valve body plugging fault;
And/or
Judge whether described the 3rd difference and described the 4th difference are all greater than the 5th preset value;
If judge described the 3rd difference and described the 4th difference is all greater than described the 5th preset value, determine that described electric expansion valve to be measured is normal.
CN201410387729.9A 2014-08-07 2014-08-07 Detection apparatus and method for electric expansion valve Expired - Fee Related CN104122084B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106404371A (en) * 2016-10-10 2017-02-15 广东美的暖通设备有限公司 Electronic expansion valve detection method, device and air conditioning system
CN107246854A (en) * 2017-08-08 2017-10-13 山东泰展机电科技股份有限公司 A kind of magnetic valve open degree testboard
CN107478421A (en) * 2017-08-08 2017-12-15 山东泰展机电科技股份有限公司 A kind of magnetic valve open degree method of testing and system
CN109813020A (en) * 2019-02-20 2019-05-28 珠海格力电器股份有限公司 Electric expansion valve choke detecting method, heat pump system control method, electric control method, electric appliance and computer readable storage medium
CN111122148A (en) * 2019-12-17 2020-05-08 重庆南方数控设备股份有限公司 Method for detecting blood by prejudging working state of electromagnetic valve based on hemorheometer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079930A (en) * 1990-12-03 1992-01-14 Atron, Inc. Apparatus and method for monitoring refrigeration system
CN1587951A (en) * 2004-08-18 2005-03-02 武汉天澄环保科技股份有限公司 Pulse valve performance detecting device and method
CN1963436A (en) * 2006-11-23 2007-05-16 中国北车集团西安车辆厂 Automatic testing method and apparatus for performance of breathing relief valve
CN101846536A (en) * 2010-05-27 2010-09-29 中国计量学院 Device and method for measuring flow of electronic expansion valve
CN102928209A (en) * 2011-08-11 2013-02-13 上海比泽机电设备科技有限公司 Comprehensive performance testing device for electronic expansion valve
CN103411766A (en) * 2013-08-13 2013-11-27 中国计量学院 Thermostatic expansion valve flow measurement device and measurement method
CN103808474A (en) * 2012-11-14 2014-05-21 广州市特种承压设备检测研究院 Method for checking sealing performance of safety valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079930A (en) * 1990-12-03 1992-01-14 Atron, Inc. Apparatus and method for monitoring refrigeration system
CN1587951A (en) * 2004-08-18 2005-03-02 武汉天澄环保科技股份有限公司 Pulse valve performance detecting device and method
CN1963436A (en) * 2006-11-23 2007-05-16 中国北车集团西安车辆厂 Automatic testing method and apparatus for performance of breathing relief valve
CN101846536A (en) * 2010-05-27 2010-09-29 中国计量学院 Device and method for measuring flow of electronic expansion valve
CN102928209A (en) * 2011-08-11 2013-02-13 上海比泽机电设备科技有限公司 Comprehensive performance testing device for electronic expansion valve
CN103808474A (en) * 2012-11-14 2014-05-21 广州市特种承压设备检测研究院 Method for checking sealing performance of safety valve
CN103411766A (en) * 2013-08-13 2013-11-27 中国计量学院 Thermostatic expansion valve flow measurement device and measurement method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106404371A (en) * 2016-10-10 2017-02-15 广东美的暖通设备有限公司 Electronic expansion valve detection method, device and air conditioning system
CN106404371B (en) * 2016-10-10 2019-03-08 广东美的暖通设备有限公司 Electric expansion valve detection method and device, air-conditioning system
CN107246854A (en) * 2017-08-08 2017-10-13 山东泰展机电科技股份有限公司 A kind of magnetic valve open degree testboard
CN107478421A (en) * 2017-08-08 2017-12-15 山东泰展机电科技股份有限公司 A kind of magnetic valve open degree method of testing and system
CN109813020A (en) * 2019-02-20 2019-05-28 珠海格力电器股份有限公司 Electric expansion valve choke detecting method, heat pump system control method, electric control method, electric appliance and computer readable storage medium
CN111122148A (en) * 2019-12-17 2020-05-08 重庆南方数控设备股份有限公司 Method for detecting blood by prejudging working state of electromagnetic valve based on hemorheometer
CN111122148B (en) * 2019-12-17 2021-11-26 重庆南方数控设备股份有限公司 Method for detecting blood by prejudging working state of electromagnetic valve based on hemorheometer

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