CN112797680A - Control device, method and system for automatically filling refrigerant and air conditioning equipment - Google Patents
Control device, method and system for automatically filling refrigerant and air conditioning equipment Download PDFInfo
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- CN112797680A CN112797680A CN202011640508.XA CN202011640508A CN112797680A CN 112797680 A CN112797680 A CN 112797680A CN 202011640508 A CN202011640508 A CN 202011640508A CN 112797680 A CN112797680 A CN 112797680A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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Abstract
The invention discloses a control device, a control method and a control system for automatically filling a refrigerant and air conditioning equipment. Wherein, the method comprises the following steps: detecting the vacuum degree value of the refrigeration system in real time; when the vacuum degree value is within a preset range, controlling a refrigerant in a refrigerant tank to flow into a refrigeration system through a first electronic expansion valve, and detecting the current pressure value of the refrigeration system in real time; and when the pressure value exceeds a preset pressure value, closing the first electronic expansion valve, controlling the refrigerant in the refrigerant tank to flow into the subcooler through the second electronic expansion valve, and flowing the refrigerant into the refrigerating system through the subcooler. The invention solves the problems of air backflow and low efficiency caused by the separation of vacuumizing and refrigerant filling in the prior art and the liquid impact of the compressor caused by the direct entering of the refrigerant in the refrigerant tank into the compressor. The first electronic expansion valve is used for realizing the integration of vacuumizing and refrigerant filling, and the second electronic expansion valve is used for circulating the refrigerant to the compressor through the cooler, so that the liquid impact of the compressor is prevented.
Description
Technical Field
The invention relates to the technical field of units, in particular to a control device, a control method and a control system for automatically filling a refrigerant and air conditioning equipment.
Background
Before refrigerant is filled into a refrigeration system, a vacuum pump is required to remove non-condensable gas, moisture and the like in air conditioning equipment, and the conventional method generally comprises the following steps: after the vacuumizing is finished, removing a liquid inlet and outlet valve vacuumizing pipe of the refrigerating system; then the filling pipe is inserted into the refrigerating system again; namely, in the prior art, the vacuumizing and the refrigerant filling are carried out separately, and the plugging and unplugging actions between the vacuumized product and the refrigerant filling are easy to cause air backflow, so that the refrigeration effect of a refrigeration system is influenced finally; secondly, the refrigerant in the refrigerant tank directly enters the compressor in the prior art, which can cause the liquid impact of the compressor.
Aiming at the problems of air backflow, low efficiency and compressor liquid impact caused by that the refrigerant in the refrigerant tank directly enters the compressor in the prior art, which are caused by the fact that vacuumizing and refrigerant filling are separately carried out, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a control device, a method and a system for automatically filling a refrigerant and air conditioning equipment, and aims to solve the problems of air backflow and low efficiency caused by the separation of vacuumizing and refrigerant filling in the prior art and the liquid impact of a compressor caused by the fact that the refrigerant in a refrigerant tank directly enters the compressor.
In order to solve the above technical problem, the present invention provides a control device for automatically filling a refrigerant, wherein the device comprises: refrigerant jar, vacuum pump, refrigerant fill stop valve, liquid pipe stop valve, trachea stop valve, pressure sensor and refrigerating system, refrigerating system includes: a subcooler and a compressor; the refrigerant tank is connected with the refrigerant filling stop valve; the device also comprises a first electronic expansion valve and a second electronic expansion valve; the refrigerant filling stop valve is connected with the liquid pipe stop valve through the first electronic expansion valve and the pressure sensor; the vacuum pump is connected with the liquid pipe stop valve and the air pipe stop valve; the air pipe stop valve is connected with the compressor; the refrigerant filling stop valve is connected with the inlet end of the subcooler through the second electronic expansion valve; and the outlet end of the subcooler is connected with the compressor.
On the other hand, the invention provides a control method for automatically filling a refrigerant, which is applied to the control device for automatically filling the refrigerant, and the method comprises the following steps:
detecting the vacuum degree value of the refrigeration system in real time;
when the vacuum degree value is within a preset range, controlling a refrigerant in a refrigerant tank to flow into a refrigeration system through a first electronic expansion valve, and detecting the current pressure value of the refrigeration system in real time;
and when the pressure value exceeds a preset pressure value, closing the first electronic expansion valve, controlling the refrigerant in the refrigerant tank to flow into the subcooler through the second electronic expansion valve, and flowing the refrigerant into the refrigerating system through the subcooler.
Optionally, when the vacuum degree value is within the preset range, controlling, by the first electronic expansion valve, the refrigerant in the refrigerant tank to flow into the refrigeration system includes:
when the vacuum degree value is detected to be smaller than the preset vacuum degree value within the preset time range, the refrigerant filling stop valve is opened according to the preset opening degree to control the outflow of the refrigerant, and the refrigerant flows into the refrigerating system through the first electronic expansion valve.
Optionally, the controlling, by the second electronic expansion valve, the refrigerant in the refrigerant tank to flow into the subcooler includes:
and detecting the temperature difference of the inlet and the outlet of the subcooler in real time, and controlling the opening degree of the second electronic expansion valve according to the temperature difference of the inlet and the outlet so as to control the amount of the refrigerant flowing into the subcooler.
Optionally, before the controlling the opening degree of the second electronic expansion valve according to the temperature value, the method includes:
detecting a saturation temperature value corresponding to the suction pressure of the compressor in real time, and judging whether the saturation temperature value is smaller than or reaches a preset saturation temperature value or not;
detecting the exhaust superheat degree of a compressor in real time, and judging whether the exhaust superheat degree exceeds a preset exhaust superheat degree or not;
detecting the first supercooling degree of the subcooler in real time, and judging whether the first supercooling degree is less than or reaches a first preset supercooling degree;
and when the saturation temperature value is smaller than or reaches a preset saturation temperature value, and/or the exhaust superheat degree exceeds a preset exhaust superheat degree, and/or the first subcooling degree is smaller than or reaches a first preset subcooling degree, opening the second electronic expansion valve to enable the refrigerant to flow into the subcooler.
Optionally, the flowing the refrigerant into the refrigeration system through the subcooler includes:
detecting the second supercooling degree of the subcooler in real time;
and when the second supercooling degree exceeds a second preset supercooling degree, closing the refrigerant filling stop valve to stop the refrigerant from flowing out.
Optionally, the detecting a vacuum degree value of the refrigeration system in real time includes:
when the refrigeration system is vacuumized through the vacuum pump, the current vacuum degree value of the refrigeration system is detected in real time through the pressure sensor at the top of the vacuum pump.
Optionally, the detecting, in real time, a current pressure value of the refrigeration system includes:
and detecting the current pressure value of the refrigeration system in real time through the pressure sensor.
On the other hand, the invention also provides a control system for automatically filling the refrigerant, which is applied to the control device for automatically filling the refrigerant, and the system comprises:
the first detection unit is used for detecting the vacuum degree value of the refrigeration system in real time;
the first judgment unit is used for controlling the refrigerant in the refrigerant tank to flow into the refrigeration system through the first electronic expansion valve when the vacuum degree value is within a preset range;
the second detection unit is used for detecting the pressure value of the refrigeration system in real time;
and the second judgment unit is used for closing the first electronic expansion valve when the pressure value exceeds a preset pressure value, controlling the refrigerant in the refrigerant tank to flow into the subcooler through the second electronic expansion valve, and flowing into the refrigerating system through the subcooler.
Optionally, the first determining unit includes:
the first judgment module is used for opening the refrigerant filling stop valve according to a preset opening degree to control outflow of the refrigerant when the vacuum degree value is detected to be smaller than the preset vacuum degree value within a preset time range, and enabling the refrigerant to flow into the refrigeration system through the first electronic expansion valve.
Optionally, the second judging unit includes:
the first detection module is used for detecting the temperature difference of the inlet and the outlet of the subcooler in real time and controlling the opening degree of the second electronic expansion valve according to the temperature difference of the inlet and the outlet so as to control the quantity of the refrigerant flowing into the subcooler.
Optionally, the method further includes:
the second judgment module is used for detecting a saturation temperature value corresponding to the suction pressure of the compressor in real time and judging whether the saturation temperature value is smaller than or reaches a preset saturation temperature value;
the third judgment module is used for detecting the exhaust superheat degree of the compressor in real time and judging whether the exhaust superheat degree exceeds a preset exhaust superheat degree or not;
the fourth judgment module is used for detecting the first supercooling degree of the subcooler in real time and judging whether the first supercooling degree is less than or reaches a first preset supercooling degree;
and the opening module is used for opening the second electronic expansion valve to enable the refrigerant to flow into the subcooler when the saturation temperature value is less than or reaches a preset saturation temperature value, and/or the exhaust superheat degree exceeds a preset exhaust superheat degree, and/or the first subcooling degree is less than or reaches a first preset subcooling degree.
Optionally, the second determining unit further includes:
the second detection module is used for detecting a second supercooling degree of the subcooler in real time;
and the fifth judgment module is used for closing the refrigerant perfusion stop valve to stop the refrigerant from flowing out when the second supercooling degree exceeds a second preset supercooling degree.
Optionally, the first detecting unit and the second detecting unit include:
the pressure sensor is used for detecting the vacuum degree value of the current refrigeration system in real time when the refrigeration system is vacuumized through the vacuum pump;
and detecting the pressure value of the refrigeration system in real time when the refrigerant in the refrigerant tank flows into the refrigeration system through the first electronic expansion valve.
Further, the invention provides an air conditioning device, which comprises the control system for automatically filling the refrigerant.
The invention also provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method as described above.
The invention has the beneficial effects that: the invention relates to a control method for automatically filling a refrigerant, which comprises the following steps: detecting the vacuum degree value of the refrigeration system in real time; when the vacuum degree value is within a preset range, controlling a refrigerant in a refrigerant tank to flow into a refrigeration system through a first electronic expansion valve, and detecting the current pressure value of the refrigeration system in real time; and when the pressure value exceeds a preset pressure value, closing the first electronic expansion valve, controlling the refrigerant in the refrigerant tank to flow into the subcooler through the second electronic expansion valve, and flowing the refrigerant into the refrigerating system through the subcooler. The problem of among the prior art evacuation and fill refrigerant separately go on air reflux, the compressor liquid that causes that the refrigerant in the low efficiency and the refrigerant jar directly gets into the compressor and cause hits is solved. The first electronic expansion valve realizes the integration of vacuumizing and refrigerant filling, improves the working efficiency and reduces the working difficulty. The refrigerant flows to the compressor through the cooler through the second electronic expansion valve, the suction superheat degree of the compressor is guaranteed, liquid impact of the compressor is prevented, the compressor can run at high frequency, and the filling efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a control device for automatically filling a refrigerant according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method for automatically filling a refrigerant according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control system for automatically filling a refrigerant according to an embodiment of the present invention;
FIG. 4 is a flow chart of evacuation according to an embodiment of the present invention;
FIG. 5 is a flow chart of shutdown refrigerant charging according to an embodiment of the present invention;
fig. 6 is a flowchart of the startup refrigerant charging according to the embodiment of the invention.
The system comprises a first detection unit-201, a first judgment unit-202, a second detection unit-203, a second judgment unit-204, a vacuum pump-1, a refrigerant tank-2, a refrigerant filling stop valve-3, a liquid pipe stop valve-4, an air pipe stop valve-5, a pressure sensor-6, a first electronic expansion valve-7, a second electronic expansion valve-8, a refrigeration system-9, a subcooler-901, a compressor-902, a filter-10, an indoor unit-11 and an outdoor unit-12.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a control device for automatically filling a refrigerant, wherein the device comprises: refrigerant jar 2, vacuum pump 1, refrigerant fill stop valve 3, liquid pipe stop valve 4, trachea stop valve 5, pressure sensor 6 and refrigerating system 9, refrigerating system 9 includes: a subcooler 901 and a compressor 902; the refrigerant tank 2 is connected with the refrigerant filling stop valve 3; the device also comprises a first electronic expansion valve 7 and a second electronic expansion valve 8; the refrigerant filling stop valve 3 is connected with the liquid pipe stop valve 4 through the first electronic expansion valve 7 and the pressure sensor 6; the vacuum pump 1 is connected with the liquid pipe stop valve 4 and the air pipe stop valve 5; the air pipe stop valve 5 is connected with the compressor 902; the refrigerant filling stop valve 3 is connected with the inlet end of the subcooler 901 through the second electronic expansion valve 8; the outlet end of the subcooler 901 is connected with the compressor 902.
In the prior art, the vacuumizing and the refrigerant filling are performed separately, namely, after the vacuumizing of the vacuum pump 1 is completed, the vacuum pump 1 is disassembled, and then the refrigerant tank 2 is plugged. In the invention, the refrigerant tank 2 is connected with the liquid pipe stop valve 4 through the first electronic expansion valve 7 and the pressure sensor 6, and the vacuum pump 1 is connected with the air pipe stop valve 5 and the liquid pipe stop valve 4 at the same time, so that the integration of vacuumizing and refrigerant filling is realized, namely, vacuumizing and refrigerant filling can be quickly switched, the problem of air backflow cannot be caused, and the efficiency is improved. Furthermore, the second electronic expansion valve 8 is connected with the inlet end of the subcooler 901, the outlet end of the subcooler 901 is connected with the compressor 902, namely, a refrigerant flows through the subcooler 901, so that the suction superheat degree of the compressor 902 is ensured, the compressor 902 is prevented from liquid impact, the compressor 902 can run at high frequency, and the filling efficiency is improved.
Fig. 2 is a flowchart of a control method for automatically filling a refrigerant according to an embodiment of the present invention, and as shown in fig. 2, the method includes:
s101, detecting the vacuum degree value of the refrigeration system in real time;
s102, when the vacuum degree value is within a preset range, controlling the refrigerant in the refrigerant tank 2 to flow into a refrigeration system 9 through a first electronic expansion valve 7, and detecting the current pressure value of the refrigeration system 9 in real time;
and S103, when the pressure value exceeds a preset pressure value, closing the first electronic expansion valve 7, controlling the refrigerant in the refrigerant tank 2 to flow into a subcooler 901 through a second electronic expansion valve 8, and flowing the refrigerant into the refrigerating system 9 through the subcooler 901.
In the prior art, a pressure sensor 6 needs to be connected during vacuum pumping, a valve needs to be opened manually, and a refrigerating system 9 needs to be operated manually to open an indoor machine valve during refrigerant filling; and in this application, open the valve automatically through the controller, real-time detection vacuum degree value and refrigerating system 9's pressure value promptly, and then judge evacuation progress and refrigerant and fill the progress, after the evacuation was accomplished, the refrigerant that automatically begins to shut down was filled, and shut down the refrigerant and fill after accomplishing, the refrigerant that automatically begins to start up was filled. The method realizes the integration of vacuumizing and refrigerant filling, the vacuumizing and refrigerant filling can be quickly switched through the first electronic expansion valve 7, and the refrigerant filling efficiency is improved; and when the refrigerant is poured, the refrigerant flows through the subcooler 901, so that the suction superheat degree of the compressor 902 is ensured, the liquid impact of the compressor 902 is prevented, the compressor 902 can run at high frequency, and the pouring efficiency is improved.
On the basis of the above embodiment, further optimizing that, when the vacuum degree value is within the preset range, the refrigerant in the refrigerant tank 2 is controlled to flow into the refrigeration system 9 through the first electronic expansion valve 7, including: when the vacuum degree value is detected to be smaller than the preset vacuum degree value within the preset time range, the refrigerant filling stop valve 3 is opened according to the preset opening degree to control the outflow of the refrigerant, and the refrigerant flows into the refrigerating system 9 through the first electronic expansion valve 7.
After the indoor unit 11 and the outdoor unit 12 are installed, firstly, the air pipe stop valve 5 and the liquid pipe stop valve 4 of the outdoor unit 12 are confirmed to be in a closed state, the vacuum pump 1 is operated to be connected with the air pipe stop valve 5 and the liquid pipe stop valve 4, after the connection is finished, the first electronic expansion valve 7 and the second electronic expansion valve 8 are closed, vacuumizing is started, at the moment, a refrigerant filling indication digital tube displays gz, an indication lamp displays white flicker, and when a vacuum degree value P is detected continuously Tmin (Tmin can be 15-30 min)bLess than a predetermined vacuum value PzWhen the vacuum pumping is finished, the indicator light displays white, wherein the preset vacuum degree value PzVacuum values are required for standards. After the vacuum pumping is finished, the refrigerating system 9 is in a vacuum state at the moment, refrigerant addition is carried out by utilizing the pressure difference between a pipeline of the refrigerating system 9 and the refrigerant tank 2, the refrigerant filling stop valve 3 is opened, the first electronic expansion valve 7 is opened, the refrigerant filling indicating nixie tube displays tz at the moment, the indicating lamp displays red flicker, and the pressure value P of the current refrigerating system 9 is detected in real timeCWhen the pressure value P isCExceeding a predetermined pressure value Pk(Preset pressure value PkPressure value of 50% of refrigerant quantity in the refrigerant tank 2 at different ambient temperatures), it is indicated that the pressure difference between the refrigerant tank 2 and the refrigeration system 9 is small, and the refrigerant filling is completed when the machine is stopped. At which time the indicator light appears red.
After the refrigerant filling for the shutdown is completed, the embodiment provides a specific process for filling the refrigerant for the startup, that is, the refrigerant in the refrigerant tank 2 is controlled to flow into the subcooler 901 by the second electronic expansion valve 8, which includes: the temperature difference between the inlet and outlet of the subcooler 901 is detected in real time, and the opening degree of the second electronic expansion valve 8 is controlled according to the temperature difference between the inlet and outlet to control the amount of the refrigerant flowing into the subcooler 902.
After the shutdown refrigerant is filled, closing the first electronic expansion valve 7, opening the second electronic expansion valve 8, displaying sz by a refrigerant filling indication nixie tube, and displaying red flashing by an indication lamp; detecting the temperature difference of the inlet and the outlet of the subcooler in real time, and according to the formula K, K is equal to K0The +10 Δ T (Δ T ═ inlet-outlet temperature difference +1, where the inlet-outlet temperature difference is T3-T5) controls the opening K of the second electronic expansion valve 8 in real time to control the amount of refrigerant flowing into the subcooler 901. In the above formula, K0And the initial opening degree of the second electronic expansion valve is delta T, the temperature difference of the inlet and the outlet of the subcooler is plus 1, T3 is the outlet temperature of the subcooler gas, and T5 is the inlet temperature of the subcooler gas. And calculating the temperature difference of the inlet and the outlet of the overcooler according to the temperature of the gas outlet of the overcooler and the temperature of the gas inlet of the overcooler.
For the condition that the second electronic expansion valve 8 is opened, the present application provides a specific embodiment, that is, before the controlling the opening degree of the second electronic expansion valve 8 according to the temperature value, the method includes: detecting a saturation temperature value corresponding to the suction pressure of the compressor 902 in real time, and judging whether the saturation temperature value is smaller than or reaches a preset saturation temperature value; detecting the exhaust superheat degree of the compressor 902 in real time, and judging whether the exhaust superheat degree exceeds a preset exhaust superheat degree; detecting a first supercooling degree of the subcooler 901 in real time, and judging whether the first supercooling degree is less than or reaches a first preset supercooling degree; when the saturation temperature value is less than or reaches a preset saturation temperature value, and/or the exhaust superheat exceeds a preset exhaust superheat, and/or the first subcooling is less than or reaches a first preset subcooling, the second electronic expansion valve 8 is opened to allow the refrigerant to flow into the subcooler 901.
When the refrigeration system meets any one of the following three conditions, the second electronic expansion valve 8 is opened to allow the refrigerant to flow into the subcooler 901, and the indicator light shows red.
Wherein the three conditions are as follows:
the first condition is as follows: p2 ≤ T1 is provided℃；
And a second condition: the exhaust superheat degree T is more than or equal to TLet 2(exhaust superheat degree T1-P1);
and (3) carrying out a third condition: the first supercooling degree L of the subcooler is less than or equal to TLet 3(supercooling degree. P1-T2 ℃ C.).
In the above formula: p2 is the saturation temperature corresponding to the suction pressure of the compressor, T1 is providedIs preset saturation temperature value, T is exhaust superheat degree of the compressor, TLet 2T1 is the discharge superheat degree of the compressor, P1 is the saturation temperature corresponding to the discharge pressure of the compressor, L is the first subcooling degree of the subcooler, TLet 3T2 is the condenser exit tube temperature for the first predetermined subcooling.
Further optimized on the basis of the above embodiment, the flowing of the refrigerant into the refrigeration system 9 through the subcooler 901 includes: detecting a second supercooling degree of the subcooler 901 in real time; and when the second supercooling degree exceeds a second preset supercooling degree, closing the refrigerant perfusion stop valve 3 to stop the refrigerant from flowing out.
After the refrigeration system 9 runs for 30min (the time can be adjusted according to the capacity of the refrigeration system), the second supercooling degree S of the subcooler 901 in the refrigeration system is judged. When the second supercooling degree S of the subcooler 901 exceeds a second preset supercooling degree (the second supercooling degree S is P3-T4), it can be determined that the refrigerant quantity in the current refrigeration system 9 meets the operation of the refrigeration system 9, at this time, the indicator light displays green, the refrigerant perfusion is completed when the refrigerator is started, otherwise, the refrigerator automatically enters the refrigerant perfusion again, and after the refrigerant perfusion is completed, the refrigerant perfusion stop valve 3 is closed to stop the refrigerant from flowing out and remove the refrigerant tank 2. Wherein, in the above formula, P3 is the pressure value P of the refrigeration systemCThe corresponding saturation temperature, T4, is the subcooler discharge temperature.
For the detection of the vacuum degree value of the refrigeration system 9, the present invention provides an embodiment, that is, the real-time detection of the vacuum degree value of the refrigeration system 9, including: when the refrigeration system 9 is vacuumized by the vacuum pump 1, the current vacuum value of the refrigeration system 9 is detected in real time by the pressure sensor 6 on the top of the vacuum pump 1.
For the detection of the pressure value of the refrigeration system 9, the present invention provides an implementation manner, that is, the detecting the current pressure value of the refrigeration system 9 in real time includes: and detecting the current pressure value of the refrigeration system 9 in real time through the pressure sensor 6.
The pressure sensor 6 at the top of the vacuum pump 1 can detect the vacuum degree value of the current refrigerating system 9 in real time, judge the vacuumizing progress according to the vacuum degree value and the preset vacuum degree value, judge that the pressure sensor 6 is connected with the refrigerant tank 2, can detect the current pressure value of the refrigerating system 9 in real time, and judge the progress of filling the refrigerant according to the pressure value and the preset pressure value. Through the pressure sensor 6, the progress of vacuumizing and filling the refrigerant can be rapidly and accurately determined.
Fig. 3 is a schematic structural diagram of a control system for automatically filling a refrigerant according to an embodiment of the present invention, and as shown in fig. 3, the system includes:
the first detection unit 201 is used for detecting the vacuum degree value of the refrigeration system in real time;
the first judgment unit 202 is configured to control, when the vacuum degree value is within a preset range, the refrigerant in the refrigerant tank 2 to flow into the refrigeration system 9 through the first electronic expansion valve 7;
the second detection unit 203 is used for detecting the pressure value of the refrigeration system 9 in real time;
the second determination unit 204 is configured to close the first electronic expansion valve 7 when the pressure value exceeds a preset pressure value, control the refrigerant in the refrigerant tank 2 to flow into the subcooler 901 through the second electronic expansion valve 8, and flow into the refrigeration system 9 through the subcooler 901.
In the prior art, a pressure sensor 6 needs to be connected during vacuum pumping, a valve needs to be opened manually, and a refrigerating system 9 needs to be operated manually to open an indoor machine valve during refrigerant filling; and in this application, open the valve automatically through the controller, real-time detection vacuum degree value and refrigerating system 9's pressure value promptly, and then judge evacuation progress and refrigerant and fill the progress, after the evacuation was accomplished, the refrigerant that automatically begins to shut down was filled, and shut down the refrigerant and fill after accomplishing, the refrigerant that automatically begins to start up was filled. The method realizes the integration of vacuumizing and refrigerant filling, the vacuumizing and refrigerant filling can be quickly switched through the first electronic expansion valve 7, and the refrigerant filling efficiency is improved; and when the refrigerant is poured, the refrigerant flows through the subcooler 901, so that the suction superheat degree of the compressor 902 is ensured, the liquid impact of the compressor 902 is prevented, the compressor 902 can run at high frequency, and the pouring efficiency is improved.
Further optimized on the basis of the foregoing embodiment, the first determining unit 202 includes: the first judgment module is used for opening the refrigerant filling stop valve 3 according to a preset opening degree to control outflow of the refrigerant when the vacuum degree value is detected to be smaller than the preset vacuum degree value within a preset time range, and enabling the refrigerant to flow into the refrigerating system 9 through the first electronic expansion valve 7.
After the indoor unit 11 and the outdoor unit 12 are installed, firstly, the air pipe stop valve 5 and the liquid pipe stop valve 4 of the outdoor unit 12 are confirmed to be in a closed state, the vacuum pump 1 is operated to be connected with the air pipe stop valve 5 and the liquid pipe stop valve 4, after the connection is finished, the first electronic expansion valve 7 and the second electronic expansion valve 8 are closed, vacuumizing is started, at the moment, the refrigerant tank 2 is injected with an indication digital pipe to display gz, an indication lamp displays white flicker, and when a vacuum degree value P is detected continuously Tmin (Tmin can be 15-30 min)bLess than a predetermined vacuum value PzWhen the vacuum pumping is finished, the indicator light displays white, wherein the preset vacuum degree value PzVacuum values are required for standards. After the vacuum pumping is finished, the refrigerating system 9 is in a vacuum state at the moment, refrigerant addition is carried out by utilizing the pressure difference between a pipeline of the refrigerating system 9 and the refrigerant tank 2, the refrigerant filling stop valve 3 is opened, the first electronic expansion valve 7 is opened, the refrigerant filling indicating nixie tube displays tz at the moment, the indicating lamp displays red flicker, and the pressure value P of the current refrigerating system 9 is detected in real timeCWhen the pressure value P isCExceeding a predetermined pressure value Pk(Preset pressure value PkPressure value of 50% of refrigerant quantity in the refrigerant tank 2 at different environmental temperatures), it is indicated that the pressure difference between the refrigerant tank 2 and the refrigeration system 9 is small, and the refrigerant filling is completed when the machine is stopped. At this time point indicatesThe lamp shows a red color.
After the shutdown refrigerant is completely filled, the embodiment provides a first detection module, configured to detect a temperature difference of the subcooler 901 in real time, and control an opening degree of the second electronic expansion valve 8 according to the temperature difference to control an amount of the refrigerant flowing into the subcooler 901.
After the shutdown refrigerant is filled, closing the first electronic expansion valve 7, opening the second electronic expansion valve 8, displaying sz by a refrigerant filling indication nixie tube, and displaying red flashing by an indication lamp; detecting the temperature difference of the inlet and the outlet of the subcooler in real time, and according to the formula K, K is equal to K0The +10 Δ T (Δ T ═ inlet-outlet temperature difference +1, where the inlet-outlet temperature difference is T3-T5) controls the opening K of the second electronic expansion valve 8 in real time to control the amount of refrigerant flowing into the subcooler 901. In the above formula, K0And the initial opening degree of the second electronic expansion valve is delta T, the temperature difference of the inlet and the outlet of the subcooler is plus 1, T3 is the outlet temperature of the subcooler gas, and T5 is the inlet temperature of the subcooler gas. And calculating the temperature difference of the inlet and the outlet of the overcooler according to the temperature of the gas outlet of the overcooler and the temperature of the gas inlet of the overcooler.
For the condition that the second electronic expansion valve 8 is opened, the present application provides an embodiment, that is, the second determining unit 204 further includes: the second judgment module is used for detecting a saturation temperature value corresponding to the suction pressure of the compressor 902 in real time and judging whether the saturation temperature value is smaller than or reaches a preset saturation temperature value; the third judgment module is used for detecting the exhaust superheat degree of the compressor 902 in real time and judging whether the exhaust superheat degree exceeds a preset exhaust superheat degree; the fourth judgment module is used for detecting the first supercooling degree of the subcooler 901 in real time and judging whether the first supercooling degree is smaller than or reaches a first preset supercooling degree; and the opening module is configured to open the second electronic expansion valve 8 to allow the refrigerant to flow into the subcooler 901 when the saturation temperature value is less than or reaches a preset saturation temperature value, and/or the exhaust superheat exceeds a preset exhaust superheat, and/or the first subcooling is less than or reaches a first preset subcooling.
When the refrigeration system meets any one of the following three conditions, the second electronic expansion valve 8 is opened to allow the refrigerant to flow into the subcooler 901, and the indicator light shows red.
Wherein the three conditions are as follows:
the first condition is as follows: p2 ≤ T1 is provided℃；
And a second condition: the exhaust superheat degree T is more than or equal to TLet 2(exhaust superheat degree T1-P1);
and (3) carrying out a third condition: the first supercooling degree L of the subcooler is less than or equal to TLet 3(supercooling degree. P1-T2 ℃ C.).
In the above formula: p2 is the saturation temperature corresponding to the suction pressure of the compressor, T1 is providedIs preset saturation temperature value, T is exhaust superheat degree of the compressor, TLet 2T1 is the discharge superheat degree of the compressor, P1 is the saturation temperature corresponding to the discharge pressure of the compressor, L is the first subcooling degree of the subcooler, TLet 3T2 is the condenser exit tube temperature for the first predetermined subcooling.
Further optimized on the basis of the foregoing embodiment, the second determining unit 204 further includes: the second detection module is used for detecting a second supercooling degree of the subcooler 901 in real time; and the fifth judgment module is used for closing the refrigerant perfusion stop valve 3 to stop the refrigerant from flowing out when the second supercooling degree exceeds the second preset supercooling degree.
After the refrigeration system 9 operates for 30min (the time can be adjusted according to the capacity of the refrigeration system), the second supercooling degree of the subcooler 901 in the refrigeration system is judged. When the second supercooling degree S of the subcooler 901 exceeds a second preset supercooling degree (the second supercooling degree S is P3-T4), it can be determined that the refrigerant quantity in the current refrigeration system 9 meets the operation of the refrigeration system 9, at this time, the indicator light displays green, the refrigerant perfusion is completed when the refrigerator is started, otherwise, the refrigerator automatically enters the refrigerant perfusion again, and after the refrigerant perfusion is completed, the refrigerant perfusion stop valve 3 is closed to stop the refrigerant from flowing out and remove the refrigerant tank 2. Wherein, in the above formula, P3 is the pressure value P of the refrigeration systemCThe corresponding saturation temperature, T4, is the subcooler discharge temperature.
For the detection of the vacuum degree value of the refrigeration system 9 and the detection of the pressure value of the refrigeration system 9, the invention provides a pressure sensor 6 for detecting the vacuum degree value of the current refrigeration system 9 in real time when the refrigeration system 9 is vacuumized by the vacuum pump 1; and detecting the pressure value of the refrigerating system 9 in real time when the refrigerant in the refrigerant tank 2 is controlled to flow into the refrigerating system 9 through the first electronic expansion valve 7.
The pressure sensor 6 at the top of the vacuum pump 1 can detect the vacuum degree value of the current refrigerating system 9 in real time, judge the vacuumizing progress according to the vacuum degree value and the preset vacuum degree value, judge that the pressure sensor 6 is connected with the refrigerant tank 2, can detect the current pressure value of the refrigerating system 9 in real time, and judge the progress of filling the refrigerant according to the pressure value and the preset pressure value. Through the pressure sensor 6, the progress of vacuumizing and filling the refrigerant can be rapidly and accurately determined.
Further, the invention provides an air conditioning device, which comprises the control system for automatically filling the refrigerant.
The invention also provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method as described above.
The invention is illustrated below by means of a preferred embodiment:
for example, the air conditioning system includes an outdoor unit 12 and a plurality of indoor units 11, the outdoor unit 12 is pre-filled with a certain amount of refrigerant before installation, the conventional refrigerant filling method is to directly connect the refrigerant tank 2 with the unit air pipe stop valve 5, a large amount of liquid refrigerant enters the air suction end of the compressor 902, and the compressor 902 is in liquid impact risk, so that the low-frequency operation of the compressor 902 needs to be controlled, and the conventional refrigerant filling method has the problems of poor operation reliability and long filling time. The invention can realize the integrated control of vacuumizing and refrigerant filling, improve the refrigerant filling efficiency of the unit, ensure the reliability of the unit by the refrigerant entering the compressor 902 after heat exchange through the subcooler 901, wherein EXV2 is an electronic expansion valve of the subcooler, EXV3 is a second electronic expansion valve, EXV4 is a first electronic expansion valve, EXV5 is a third electronic expansion valve, EXV6 is a fourth electronic expansion valve, and the refrigerant filling steps are as follows:
1. vacuum pumping stage
The installation of the indoor and outdoor units is completed by confirming the outdoor unit12, an air pipe stop valve 5 and a liquid pipe stop valve 4 are in a closed state, a vacuum pump 1 is operated to be connected with detection ports of the air pipe stop valve 5 and the liquid pipe stop valve 4, a refrigerant tank 2 is connected with a refrigerant filling stop valve 3, after preparation work is finished, a refrigeration system firstly performs vacuumizing, at the moment, a first electronic expansion valve 7 and a second electronic expansion valve 8 are in a closed state, an outdoor unit 12 receives a vacuumizing signal, a refrigerant filling indicating digital pipe displays gz, and an indicating lamp displays white flicker; the indoor units EXV5, EXV6, and the like are all opened to the maximum opening degree; when the pressure sensor 6 continuously detects the vacuum value P of the current refrigerating system 9 for T minb＜PZWhen (P)ZThe required vacuum degree value is a standard vacuum degree value, namely a preset vacuum degree value), the completion of the vacuum degree work is indicated, the indicator lamp displays white, the completion of the vacuumizing work is confirmed, and the refrigerant filling stop valve is closed.
FIG. 4 is a flow chart of evacuation according to an embodiment of the present invention, as shown in FIG. 4:
s401, connecting a vacuum pump with a refrigerant tank;
s402, receiving a signal by an outdoor unit;
s403, the indicator light flashes in white, the nixie tube displays gz, and the EXV5 and the EXV6 are opened to the maximum opening degree;
s404. if Tmin is continuous, Pb＜PZThe process proceeds to S405, and if not, returns to S403;
s405, the indicator light is white;
s406, finishing vacuumizing.
2. Shut down priming phase
At this time, the indoor unit 11 and the pipeline connected with the outdoor unit 12 are in a vacuum state, and refrigerant addition is carried out by utilizing the pressure difference between the pipeline of the refrigeration system 9 and the refrigerant tank 2; the refrigerant filling stop valve 3 is opened, the refrigerant flows out of the refrigerant tank 2 and is filtered by the filter 10, the outdoor unit 12 receives signals, the refrigerant filling indicating nixie tube displays tz, the indicating lamp displays red flicker, the first electronic expansion valve 7 is opened to the maximum opening degree, and when the pressure sensor 6 detects the pressure value P of the current refrigerating system 9C≥PkWhen (P)kPressure value at which the amount of refrigerant in the refrigerant tank 2 is 50% at different ambient temperatures), and the refrigerant tank 2 and the system will be describedThe pressure difference of the cold system 9 is small, the stop filling stage is completed, the indicator light is displayed in red, a SW1 key (SW1 is a physical control switch key when the refrigerant filling is completed) is pressed for a short time, the completion of the stop filling of the refrigerant is confirmed, the first electronic expansion valve 7 is closed, and the EXV5, the EXV6 and the like of the indoor unit 11 are reset.
Fig. 5 is a flow chart of stopping refrigerant filling according to an embodiment of the invention, as shown in fig. 5:
s501, removing the vacuum pump, and opening a refrigerant filling stop valve;
s502, receiving a signal by an outdoor unit;
s503, an indicator light flashes in red, a nixie tube displays tz, and an EXV4 is opened to the maximum opening degree;
s504. if PC≥PkThe process proceeds to S505, and if not, the process returns to S503;
s505, the indicator light is red;
s506, closing EXV4, resetting EXV5 and the like, and ending the stop filling.
3. Priming phase
The stop valve 5 of the gas-liquid pipe of the outdoor unit 12 is opened, the outdoor unit 12 receives signals, the refrigerant perfusion indicating nixie tube displays sz, the indicating lamp displays red flicker, the refrigeration system 9 operates according to the refrigeration mode, the electronic expansion valve of the subcooler is closed, and the initial opening K of the second electronic expansion valve 8 is0The opening K of the second electronic expansion valve 8 is K0+10 Δ T (Δ T ═ T3-T5+1), the maximum opening degree and the minimum opening degree of the second electronic expansion valve 8 are controlled by the difference in the inlet-outlet temperature of the subcooler. In the formula, Δ T is the inlet and outlet temperature difference of the subcooler +1, T3 is the subcooler gas outlet temperature, and T5 is the subcooler gas inlet temperature.
The first condition is as follows: p2 ≤ T1 is provided℃；
And a second condition: the exhaust superheat degree T is more than or equal to TLet 2(exhaust superheat degree T1-P1);
and (3) carrying out a third condition: the first supercooling degree L of the subcooler is less than or equal to TLet 3(supercooling degree. P1-T2 ℃ C.).
Wherein P2 is the saturation temperature corresponding to the suction pressure of the compressor, T1 is providedIs preset saturation temperature value, T is exhaust superheat degree of the compressor, TLet 2To prepareSetting the discharge superheat degree, T1 being the discharge temperature of the compressor, P1 being the saturation temperature corresponding to the discharge pressure of the compressor, L being the first subcooling degree of the subcooler, TLet 3T2 is the condenser exit tube temperature for the first predetermined subcooling.
When any one of the above conditions is met, the second electronic expansion valve 8 is in an open state, the refrigerant filling continues to operate, otherwise, the refrigerant filling is stopped, the second electronic expansion valve 8 is closed, and the indicator light displays red.
After the refrigerating system 9 operates for Hmin (the default time is 30min, which is adjusted according to the capacity of the refrigerating system 9), when the second supercooling degree S of the subcooler 901 is greater than or equal to TLet 4When the temperature is higher than the second supercooling degree P3-T4, the refrigerant quantity in the current refrigeration system 9 can be judged to meet the operation requirement of the refrigeration system 9, the indicating lamp displays green at the moment, the refrigerant perfusion stop valve 3 is closed after the completion of the refrigerant perfusion of the starting-up perfusion stage is confirmed, and the refrigerant tank 2 is removed. Wherein, TLet 4Is the second preset supercooling degree, and P3 is the pressure value P of the refrigerating systemCThe corresponding saturation temperature, T4, is the subcooler discharge temperature.
Fig. 6 is a flowchart of the refrigerant charging for starting up according to the embodiment of the invention, as shown in fig. 6:
s601, opening a gas-liquid pipe stop valve of an outdoor unit;
s602, an outdoor unit receives a signal;
s603, the indicator light flashes red, the nixie tube displays sz, EXV2 is closed, and EXV3 is K0+10Δt；
S604, judging that P2 is not more than T1 is providedDEG C, the degree of superheat T of exhaust gas is more than or equal to TLet 2DEG C, and the first supercooling degree L of the subcooler is less than or equal to TLet 3If any condition is met, returning to S603, and if not, entering S605;
s605.EXV3 is closed;
s606, operating the unit Hmin, and enabling the second supercooling degree S of the subcooler to be more than or equal to TLet 4If yes, entering S607, otherwise returning to S603;
s607, displaying green by an indicator light;
and S608, finishing refrigerant perfusion.
The invention has the beneficial effects that: the invention relates to a control method for automatically filling a refrigerant, which comprises the following steps: detecting the vacuum degree value of the refrigeration system in real time; when the vacuum degree value is within a preset range, controlling a refrigerant in a refrigerant tank to flow into a refrigeration system through a first electronic expansion valve, and detecting the current pressure value of the refrigeration system in real time; and when the pressure value exceeds a preset pressure value, closing the first electronic expansion valve, controlling the refrigerant in the refrigerant tank to flow into the subcooler through the second electronic expansion valve, and flowing the refrigerant into the refrigerating system through the subcooler. The problem of among the prior art evacuation and fill refrigerant separately go on air reflux, the compressor liquid that causes that the refrigerant in the low efficiency and the refrigerant jar directly gets into the compressor and cause hits is solved. The first electronic expansion valve realizes the integration of vacuumizing and refrigerant filling, improves the working efficiency and reduces the working difficulty. The refrigerant flows to the compressor through the cooler through the second electronic expansion valve, the suction superheat degree of the compressor is guaranteed, liquid impact of the compressor is prevented, the compressor can run at high frequency, and the filling efficiency is improved.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (16)
1. A control device for automatically filling refrigerant comprises: refrigerant jar, vacuum pump, refrigerant fill stop valve, liquid pipe stop valve, trachea stop valve, pressure sensor and refrigerating system, refrigerating system includes: a subcooler and a compressor; the refrigerant tank is connected with the refrigerant filling stop valve; the device is characterized by also comprising a first electronic expansion valve and a second electronic expansion valve;
the refrigerant filling stop valve is connected with the liquid pipe stop valve through the first electronic expansion valve and the pressure sensor;
the vacuum pump is connected with the liquid pipe stop valve and the air pipe stop valve; the air pipe stop valve is connected with the compressor; the refrigerant filling stop valve is connected with the inlet end of the subcooler through the second electronic expansion valve; and the outlet end of the subcooler is connected with the compressor.
2. A control method for automatically charging refrigerant, applied to the control device for automatically charging refrigerant according to claim 1, comprising:
detecting the vacuum degree value of the refrigeration system in real time;
when the vacuum degree value is within a preset range, controlling a refrigerant in a refrigerant tank to flow into a refrigeration system through a first electronic expansion valve, and detecting the current pressure value of the refrigeration system in real time;
and when the pressure value exceeds a preset pressure value, closing the first electronic expansion valve, controlling the refrigerant in the refrigerant tank to flow into the subcooler through the second electronic expansion valve, and flowing the refrigerant into the refrigerating system through the subcooler.
3. The method as claimed in claim 2, wherein the controlling the refrigerant flowing into the refrigerant tank through the first electronic expansion valve when the vacuum degree value is within the preset range comprises:
when the vacuum degree value is detected to be smaller than the preset vacuum degree value within the preset time range, the refrigerant filling stop valve is opened according to the preset opening degree to control the outflow of the refrigerant, and the refrigerant flows into the refrigerating system through the first electronic expansion valve.
4. The method of claim 2, wherein controlling the flow of refrigerant from the refrigerant tank into the subcooler via a second electronic expansion valve comprises:
and detecting the temperature difference of the inlet and the outlet of the subcooler in real time, and controlling the opening degree of the second electronic expansion valve according to the temperature difference of the inlet and the outlet so as to control the amount of the refrigerant flowing into the subcooler.
5. The method of claim 4, wherein prior to said controlling the opening degree of the second electronic expansion valve in accordance with the temperature value, comprising:
detecting a saturation temperature value corresponding to the suction pressure of the compressor in real time, and judging whether the saturation temperature value is smaller than or reaches a preset saturation temperature value or not;
detecting the exhaust superheat degree of a compressor in real time, and judging whether the exhaust superheat degree exceeds a preset exhaust superheat degree or not;
detecting the first supercooling degree of the subcooler in real time, and judging whether the first supercooling degree is less than or reaches a first preset supercooling degree;
and when the saturation temperature value is smaller than or reaches a preset saturation temperature value, and/or the exhaust superheat degree exceeds a preset exhaust superheat degree, and/or the first subcooling degree is smaller than or reaches a first preset subcooling degree, opening the second electronic expansion valve to enable the refrigerant to flow into the subcooler.
6. The method of claim 4, wherein said flowing the refrigerant into the refrigeration system through the subcooler comprises:
detecting the second supercooling degree of the subcooler in real time;
and when the second supercooling degree exceeds a second preset supercooling degree, closing the refrigerant filling stop valve to stop the refrigerant from flowing out.
7. The method of claim 2, wherein the detecting a vacuum level of the refrigeration system in real time comprises:
when the refrigeration system is vacuumized through the vacuum pump, the current vacuum degree value of the refrigeration system is detected in real time through the pressure sensor at the top of the vacuum pump.
8. The method of claim 2, wherein the detecting a current pressure value of the refrigeration system in real time comprises:
and detecting the current pressure value of the refrigeration system in real time through the pressure sensor.
9. A control system for automatically charging refrigerant, applied to the control device for automatically charging refrigerant according to claim 1, comprising:
the first detection unit is used for detecting the vacuum degree value of the refrigeration system in real time;
the first judgment unit is used for controlling the refrigerant in the refrigerant tank to flow into the refrigeration system through the first electronic expansion valve when the vacuum degree value is within a preset range;
the second detection unit is used for detecting the pressure value of the refrigeration system in real time;
and the second judgment unit is used for closing the first electronic expansion valve when the pressure value exceeds a preset pressure value, controlling the refrigerant in the refrigerant tank to flow into the subcooler through the second electronic expansion valve, and flowing into the refrigerating system through the subcooler.
10. The system according to claim 9, wherein the first judging unit includes:
the first judgment module is used for opening the refrigerant filling stop valve according to a preset opening degree to control outflow of the refrigerant when the vacuum degree value is detected to be smaller than the preset vacuum degree value within a preset time range, and enabling the refrigerant to flow into the refrigeration system through the first electronic expansion valve.
11. The system according to claim 9, wherein the second determination unit comprises:
the first detection module is used for detecting the temperature difference of the inlet and the outlet of the subcooler in real time and controlling the opening degree of the second electronic expansion valve according to the temperature difference of the inlet and the outlet so as to control the quantity of the refrigerant flowing into the subcooler.
12. The system of claim 11, further comprising:
the second judgment module is used for detecting a saturation temperature value corresponding to the suction pressure of the compressor in real time and judging whether the saturation temperature value is smaller than or reaches a preset saturation temperature value;
the third judgment module is used for detecting the exhaust superheat degree of the compressor in real time and judging whether the exhaust superheat degree exceeds a preset exhaust superheat degree or not;
the fourth judgment module is used for detecting the first supercooling degree of the subcooler in real time and judging whether the first supercooling degree is less than or reaches a first preset supercooling degree;
and the opening module is used for opening the second electronic expansion valve to enable the refrigerant to flow into the subcooler when the saturation temperature value is less than or reaches a preset saturation temperature value, and/or the exhaust superheat degree exceeds a preset exhaust superheat degree, and/or the first subcooling degree is less than or reaches a first preset subcooling degree.
13. The system according to claim 12, wherein the second determination unit further comprises:
the second detection module is used for detecting a second supercooling degree of the subcooler in real time;
and the fifth judgment module is used for closing the refrigerant perfusion stop valve to stop the refrigerant from flowing out when the second supercooling degree exceeds a second preset supercooling degree.
14. The system of claim 9, wherein the first and second detection units comprise:
the pressure sensor is used for detecting the vacuum degree value of the current refrigeration system in real time when the refrigeration system is vacuumized through the vacuum pump;
and detecting the pressure value of the refrigeration system in real time when the refrigerant in the refrigerant tank flows into the refrigeration system through the first electronic expansion valve.
15. An air conditioning apparatus, characterized by comprising: the system as claimed in any one of claims 9 to 14.
16. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method according to any one of claims 2-8.
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| CN116428778A (en) * | 2023-04-19 | 2023-07-14 | 绍兴西爱西尔数控科技有限公司 | Correction-free refrigerant filling machine |
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Application publication date: 20210514 |