CN111928447A - Refrigerant leakage judging method and device - Google Patents
Refrigerant leakage judging method and device Download PDFInfo
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- CN111928447A CN111928447A CN202010700232.3A CN202010700232A CN111928447A CN 111928447 A CN111928447 A CN 111928447A CN 202010700232 A CN202010700232 A CN 202010700232A CN 111928447 A CN111928447 A CN 111928447A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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Abstract
The invention provides a refrigerant leakage judging method and a refrigerant leakage judging device, wherein the method comprises the following steps: starting timing by a preset timer when a compressor starts, acquiring winding parameters of the compressor at least twice after the timing length of the timer reaches a preset waiting time, judging whether the difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold value range or not according to any first winding parameter and any second winding parameter acquired by two adjacent parameter acquisition time points in sequence, and determining that the compressor does not leak refrigerant if the difference value between the first winding parameter and the second winding parameter is within the winding parameter difference threshold value range; and determining that the compressor has a refrigerant leak if the difference between the first winding parameter and the second winding parameter is outside a winding parameter difference threshold range. The scheme can improve the accuracy of the judgment result of the refrigerant leakage.
Description
Technical Field
The invention relates to the technical field of electrical engineering, in particular to a method and a device for judging refrigerant leakage.
Background
The refrigerant is in a very important position in a refrigeration system, the refrigerant flows through the motor before (or after) the compressor finishes compression, the effect of heat dissipation of the motor of the compressor is realized through heat exchange, and the temperature of a motor winding, namely the heat dissipation effect, depends on the flow rate of the refrigerant and the temperature of the refrigerant. After the refrigerant flows through the compressor motor, the exhaust pipeline continuously exchanges heat with the ambient air through the compressor shell, and the temperature of high-temperature gas of the refrigerant is also continuously reduced. The refrigerant has the possibility of slow leakage in the operation process of the refrigeration system, and the leakage of the refrigerant reaches a certain amount, which can cause the temperature of a motor of the compressor to be overhigh and cause the insulation damage and the failure.
At present, aiming at the problem of refrigerant leakage, the chinese patent of patent No. CN201610319177.7 discloses a refrigerant leakage detection method, a refrigerant leakage detection device and an air conditioner, and the method determines the theoretical exhaust temperature of the compressor according to the working condition and the operating state of the air conditioner by detecting the real-time exhaust temperature of the compressor of the air conditioner, and further determines whether the refrigerant in the air conditioner leaks according to the real-time exhaust temperature and the theoretical exhaust temperature. The invention also discloses a protection device for preventing the exhaust temperature of the compressor of the air conditioner from being overhigh as the Chinese invention patent of the patent number CN200810153272.X, the method is that an electromagnetic valve is arranged between an air return pipe of the compressor connected with a liquid storage tank and a liquid pipe which leads the refrigerant to flow to an indoor evaporator and is connected with an outdoor heat exchanger, and the electromagnetic valve is opened when an exhaust pipe of the compressor sensed by a temperature sensor on the compressor exceeds a set value.
According to the prior art, whether the refrigerant leaks is judged by detecting the exhaust temperature of the compressor, but the exhaust temperature change is not obvious when the compressor operates normally, so that the accuracy of the judgment result of the refrigerant leakage is poor.
Disclosure of Invention
The embodiment of the invention provides a method and a device for judging refrigerant leakage, which can improve the accuracy of a refrigerant leakage judgment result.
In a first aspect, an embodiment of the present invention provides a refrigerant leakage determination method, including:
starting timing by a preset timer when the compressor starts to start;
when the timing length of the timer reaches a preset waiting time, collecting winding parameters of the compressor at least twice, wherein the waiting time is 0.5-3 seconds;
aiming at any first winding parameter and any second winding parameter which are sequentially acquired at two adjacent parameter acquisition time points, judging whether the difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold value range;
determining that the compressor does not leak refrigerant if the difference between the first winding parameter and the second winding parameter is within the winding parameter difference threshold range;
determining that the compressor has a refrigerant leak if the difference between the first winding parameter and the second winding parameter is outside the winding parameter difference threshold range.
Optionally, the waiting time is 0.5-3 seconds, and includes:
the waiting time is 1-2 seconds;
optionally, the determining whether the difference between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold range includes:
aiming at a first winding current and a second winding current which are sequentially acquired from the compressor at any two adjacent parameter acquisition time points, judging whether the difference value between the first winding current and the second winding current is within a preset current difference threshold range;
determining that the compressor has not leaked refrigerant if the difference between the first winding current and the second winding current is within the current difference threshold range;
determining that the compressor has a refrigerant leak if a difference between the first winding current and the second winding current is outside the current difference threshold range.
Optionally, the determining whether the difference between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold range includes:
the method comprises the steps that whether the difference value between the first winding temperature and the second winding temperature is within a preset temperature difference threshold range or not is judged according to the first winding temperature and the second winding temperature which are sequentially collected from the compressor at any two adjacent parameter collection time points;
determining that the compressor has not leaked refrigerant if the difference between the first winding temperature and the second winding temperature is within the temperature difference threshold range;
determining that the compressor has a refrigerant leak if a difference between the first winding temperature and the second winding temperature is outside the temperature difference threshold range.
Optionally, the collecting the winding parameters of the compressor at least twice includes:
acquiring the magnetic flux of the compressor once every one interval according to preset interval time;
taking a ratio of a difference between a first magnetic flux and a second magnetic flux to the second magnetic flux as a magnetic flux change rate corresponding to a current time, wherein the first magnetic flux is the magnetic flux of the compressor acquired at the current time, and the second magnetic flux is the magnetic flux of the compressor acquired at a previous time relative to the current time;
determining the winding parameter corresponding to the current moment according to the magnetic flux change rate corresponding to the current moment, wherein the winding parameter is the winding temperature or the winding current of the compressor.
Optionally, after determining that the compressor has a refrigerant leak, further comprising:
acquiring refrigerant leakage data, wherein the refrigerant leakage data is used for representing the speed of the compressor for generating refrigerant leakage;
transmitting the refrigerant leakage data to a server to transmit the refrigerant leakage data to a user terminal through the server.
In a second aspect, an embodiment of the present invention provides a refrigerant leakage determination apparatus, including: the device comprises a timing module, an acquisition module, a judgment module, a first determination module and a second determination module;
the timing module is used for starting timing through a preset timer when the compressor starts to start;
the acquisition module is used for acquiring the winding parameters of the compressor at least twice after the timing module controls the timing length of the timer to reach a preset waiting time;
the judgment module is used for judging whether the difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold value range or not according to any first winding parameter and any second winding parameter which are sequentially acquired by the acquisition module at two adjacent parameter acquisition time points;
the first determining module is configured to determine that the compressor does not leak the refrigerant when the determining module determines that the difference between the first winding parameter and the second winding parameter is within the winding parameter difference threshold range;
the second determining module is configured to determine that refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding parameter and the second winding parameter is outside the winding parameter difference threshold range.
Alternatively,
the judging module is used for judging whether the difference value between the first winding current and the second winding current is within a preset current difference threshold value range or not according to the first winding current and the second winding current which are sequentially collected from the compressor at any two adjacent parameter collecting time points by the collecting module;
the first determining module is configured to determine that no refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding current and the second winding current is within the current difference threshold range;
the second determining module is configured to determine that refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding current and the second winding current is outside the current difference threshold range.
Alternatively,
the judging module is used for judging whether the difference value between the first winding temperature and the second winding temperature is within a preset temperature difference threshold value range or not according to the first winding temperature and the second winding temperature which are sequentially acquired from the compressor by the acquiring module at any two adjacent parameter acquiring time points;
the first determining module is configured to determine that no refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding temperature and the second winding temperature is within the temperature difference threshold range;
the second determining module is configured to determine that the refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding temperature and the second winding temperature is outside the temperature difference threshold range.
Optionally, the acquisition module comprises: the device comprises a collecting unit, a calculating unit and a determining unit;
the acquisition unit is used for acquiring the magnetic flux of the compressor once after one interval time according to the preset interval time;
the calculating unit is used for taking the ratio of the difference value between the first magnetic flux and the second magnetic flux acquired by the acquiring unit and the second magnetic flux as the magnetic flux change rate corresponding to the current moment;
the determining unit is used for determining the compressor winding parameter corresponding to the current moment according to the magnetic flux change rate corresponding to the current moment calculated by the calculating unit.
Optionally, further comprising: the device comprises an acquisition module and a sending module;
the obtaining module is configured to obtain refrigerant leakage data after the second determining module determines that the compressor has refrigerant leakage, where the refrigerant leakage data is used to characterize a speed of the compressor at which the refrigerant leakage occurs;
the sending module is used for sending the refrigerant leakage data acquired by the acquiring module to a server so as to send the refrigerant leakage data to a user terminal through the server.
According to the method and the device for judging the refrigerant leakage, when the compressor is started, timing is started by using the preset timer, when the timing length of the timer reaches the preset waiting time, the preset waiting time is 0.5-3 seconds, the optimal waiting time is 1-2 seconds, and then winding parameters of the compressor are acquired at least twice, wherein the winding parameters of the compressor comprise the winding temperature and the winding current of the compressor. For any first winding parameter and any second winding parameter which are sequentially acquired at two adjacent parameter acquisition time points, firstly, judging the difference value between the first winding parameter and the second winding parameter, judging whether the difference value is within a preset winding parameter difference threshold range, and determining that the compressor does not leak refrigerant when judging that the difference value is within the preset winding parameter difference threshold range; when the difference value is judged to be out of the range of the preset winding parameter difference threshold value, the refrigerant leakage of the compressor is determined, and the problem of low winding parameter measurement accuracy caused by overlarge starting current can be effectively solved because the winding parameters of the compressor are collected after the compressor is started for a certain time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a refrigerant leakage judging method according to an embodiment of the present invention;
fig. 2 is a schematic view of an apparatus in which a refrigerant leakage judging device according to an embodiment of the present invention is provided;
fig. 3 is a schematic view of a refrigerant leakage judging device according to an embodiment of the present invention;
fig. 4 is a schematic view of another refrigerant leakage judging device according to an embodiment of the present invention;
fig. 5 is a schematic view of still another refrigerant leakage judging device according to an embodiment of the present invention;
fig. 6 is a flowchart of another refrigerant leakage determination method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a refrigerant leakage judging method, which may include the steps of:
step 101: starting timing by a preset timer when the compressor starts to start;
step 102: when the timing length of the timer reaches a preset waiting time, collecting winding parameters of the compressor at least twice;
step 103: for any first winding parameter and any second winding parameter which are sequentially acquired at two adjacent parameter acquisition time points, judging whether the difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold value range, if so, executing a step 104, otherwise, executing a step 105;
step 104: if the difference value between the first winding parameter and the second winding parameter is within the winding parameter difference threshold value range, determining that the compressor does not leak the refrigerant, and ending the current process;
step 105: and determining that the compressor has a refrigerant leak if the difference between the first winding parameter and the second winding parameter is outside a winding parameter difference threshold range.
The refrigerant leakage judging method provided by the embodiment of the invention starts timing by utilizing the preset timer, and then carries out at least two times of collection on the winding parameters of the compressor after the timing length of the timer reaches the preset waiting time. For any first winding parameter and any second winding parameter which are sequentially acquired at two adjacent parameter acquisition time points, firstly, judging the difference value between the first winding parameter and the second winding parameter, judging whether the difference value is within a preset winding parameter difference threshold range, and determining that the compressor does not leak refrigerant when judging that the difference value is within the preset winding parameter difference threshold range; when the difference value is judged to be out of the range of the preset winding parameter difference threshold value, the refrigerant leakage of the compressor is determined, and the problem of low winding parameter measurement accuracy caused by overlarge starting current can be effectively solved because the winding parameters of the compressor are collected after the compressor is started for a certain time, so that the refrigerant leakage judgment method can improve the accuracy of the refrigerant leakage judgment result.
In the embodiment of the invention, a timer is preset to time when the compressor starts, usually, the starting current of the compressor when the compressor starts is large and fluctuation is large, and if winding parameters are collected when the compressor starts, errors are easy to occur, so that when the compressor starts, a period of time is set to ensure that the starting current of the compressor is stable, then the winding parameters are collected, the collection error caused by large starting current can be avoided, and the accuracy of the judgment result of refrigerant leakage can be improved.
In the embodiment of the invention, after the compressor is started for a period of time, the starting current of the compressor reaches a stable state, the winding parameters of the compressor are collected when the compressor normally runs, the winding parameters of any two adjacent collected windings can accurately reflect the change condition of the winding current or the winding temperature of the compressor, the winding parameter change in the running state of the compressor can be monitored in real time, and the normal running of the compressor can be ensured.
In the embodiment of the invention, whether the difference value of the winding parameters at the adjacent moments is within the preset winding parameter difference threshold range can be judged, and further whether the compressor leaks the refrigerant can be determined.
In the embodiment of the invention, when the difference value of the first winding parameter and the second winding parameter is judged to be within the preset winding parameter difference threshold value range through any first winding parameter and any second winding parameter acquired at adjacent moments, the fact that the refrigerant of the compressor is not leaked is indicated, and the fact that the running state of the compressor is normal is further indicated.
In the embodiment of the invention, when the difference value of the first winding parameter and the second winding parameter is judged to be out of the preset winding parameter difference threshold value range through any first winding parameter and any second winding parameter acquired at adjacent moments, the leakage of the refrigerant of the compressor is indicated, the abnormal operation of the compressor can be directly judged at the moment, and the existing faults of the compressor are solved.
Alternatively, in the refrigerant leakage judging method of fig. 1, the judging whether the difference between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold range in step 103 includes:
the method comprises the steps that whether a difference value between first winding current and second winding current is within a preset current difference threshold value range or not is judged according to the first winding current and the second winding current which are sequentially collected from a compressor at any two adjacent parameter collection time points;
determining that the compressor has not leaked refrigerant if a difference between the first winding current and the second winding current is within a current difference threshold range;
and determining that the compressor has a refrigerant leakage if the difference between the first winding current and the second winding current is outside a current difference threshold range.
In the embodiment of the invention, under the normal operation mode of the compressor, the judgment process of the refrigerant leakage can be realized according to the real-time calculation of the winding current of the compressor. The method can rapidly and effectively identify the refrigerant leakage condition by utilizing the steps of compressor current driving, current detection, current calculation and current comparison to calculate the magnitude of the current value at a certain time interval to judge the refrigerant leakage condition.
Alternatively, in the refrigerant leakage judging method of fig. 1, the judging whether the difference between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold range in step 105 includes:
the method comprises the steps that whether the difference value between the first winding temperature and the second winding temperature is within a preset temperature difference threshold value range or not is judged according to the first winding temperature and the second winding temperature which are sequentially collected from a compressor at any two adjacent parameter collection time points;
determining that the compressor has not leaked refrigerant if a difference between the first winding temperature and the second winding temperature is within a temperature difference threshold range;
and determining that the compressor has a refrigerant leakage if the difference between the first winding temperature and the second winding temperature is outside a temperature difference threshold range.
In the embodiment of the invention, under the normal operation mode of the compressor, the leakage condition of the refrigerant can be judged according to the difference value between the instantaneous winding temperature of the compressor and the winding temperature of the compressor under a certain frequency.
Optionally, in the refrigerant leakage judging method shown in fig. 1, step 102 performs at least two times of collecting winding parameters of the compressor, including:
acquiring the magnetic flux of the compressor once every interval according to preset interval time;
taking a ratio of a difference between a first magnetic flux and a second magnetic flux to a second magnetic flux as a magnetic flux change rate corresponding to a current time, wherein the first magnetic flux is the magnetic flux of the compressor acquired at the current time, and the second magnetic flux is the magnetic flux of the compressor acquired at a previous time relative to the current time;
and determining the winding parameters of the compressor corresponding to the current moment according to the magnetic flux change rate corresponding to the current moment.
In the embodiment of the invention, the magnetic flux in the running mode of the compressor is collected in real time, the ratio of the difference value between the first magnetic flux and the second magnetic flux at adjacent moments to the second magnetic flux is calculated to be used as the magnetic flux change rate corresponding to the current moment, and the winding parameter of the compressor at the current moment is determined through the calculated magnetic flux change rate.
Optionally, in the refrigerant leakage judging method of fig. 1, after it is determined that the refrigerant leakage from the compressor occurs, the method further includes:
acquiring refrigerant leakage data, wherein the refrigerant leakage data is used for representing the speed of the compressor for generating refrigerant leakage;
the refrigerant leakage data is transmitted to the server to transmit the refrigerant leakage data to the user terminal through the server.
In the embodiment of the invention, after the refrigerant leakage of the compressor is determined, the refrigerant leakage data is obtained, the refrigerant leakage data can reflect the refrigerant leakage speed, and the refrigerator leakage data is sent to the server, so that the server can send the refrigerant leakage data to the user terminal, and can send alarm information to a user, and the refrigerant leakage fault information can be effectively fed back to the user in time.
As shown in fig. 2 and 3, the embodiment of the present invention provides a refrigerant leakage judging device. The device embodiments may be implemented by software, or by hardware, or by a combination of hardware and software. From a hardware aspect, as shown in fig. 2, a hardware structure diagram of the refrigerant leakage determination apparatus according to the embodiment of the present invention is provided, where in addition to the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 2, the device in the embodiment may also include other hardware, such as a forwarding chip responsible for processing a packet. Taking a software implementation as an example, as shown in fig. 3, as a logical apparatus, the apparatus is formed by reading, by a CPU of a device in which the apparatus is located, corresponding computer program instructions in a non-volatile memory into a memory for execution. The present embodiment provides a refrigerant leakage determination device, including: a timing module 301, an acquisition module 302, a judgment module 303, a first determination module 304 and a second determination module 305;
the timing module 301 is configured to start timing by a preset timer when the compressor starts to start;
the acquisition module 302 is used for acquiring the winding parameters of the compressor at least twice after the timing module 301 controls the timing length of the timer to reach a preset waiting time;
a judging module 303, configured to judge, for any first winding parameter and any second winding parameter that are sequentially acquired by the acquiring module 302 at two adjacent parameter acquiring time points, whether a difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold range;
a first determining module 304, configured to determine that refrigerant leakage does not occur in the compressor when the determining module 303 determines that the difference value between the first winding parameter and the second winding parameter is within the winding parameter difference threshold range;
a second judging module 305, configured to determine that the compressor has a refrigerant leak when the judging module 303 judges that the difference value between the first winding parameter and the second winding parameter is outside the winding parameter difference threshold range.
Alternatively, on the basis of the refrigerant leakage judging means shown in fig. 3,
a judging module 303, configured to judge, for a first winding current and a second winding current that are sequentially acquired from the compressor at any two adjacent parameter acquisition time points by the acquiring module 302, whether a difference value between the first winding current and the second winding current is within a preset current difference threshold range;
a first determining module 304, configured to determine that no refrigerant leakage occurs in the compressor when the determining module 303 determines that the difference between the first winding current and the second winding current is within the current difference threshold range;
a second determining module 305, configured to determine that refrigerant leakage occurs in the compressor when the determining module 303 determines that the difference between the first winding current and the second winding current is outside the current difference threshold range.
Alternatively, on the basis of the refrigerant leakage judging means shown in fig. 3,
a judging module 303, configured to judge, according to the first winding temperature and the second winding temperature sequentially acquired by the acquiring module 302 from the compressor at any two adjacent parameter acquisition time points, whether a difference between the first winding temperature and the second winding temperature is within a preset temperature difference threshold range;
a first determining module 304, configured to determine that no refrigerant leakage occurs in the compressor when the determining module 303 determines that the difference between the first winding temperature and the second winding temperature is within the temperature difference threshold range;
a second determining module 305, configured to determine that the refrigerant leakage occurs in the compressor when the determining module 303 determines that the difference between the first winding temperature and the second winding temperature is outside the temperature difference threshold range.
Alternatively, on the basis of the refrigerant leakage judging device shown in fig. 3, as shown in fig. 4, the collecting module 302 includes: an acquisition unit 401, a calculation unit 402 and a determination unit 403;
the acquisition unit 401 is configured to acquire the magnetic flux of the compressor once every interval time according to a preset interval time;
a calculating unit 402 configured to take a ratio of a difference between the first magnetic flux and the second magnetic flux acquired by the acquiring unit 401 to the second magnetic flux as a magnetic flux change rate corresponding to the current time;
a determining unit 403 for determining the compressor winding parameter corresponding to the current time from the magnetic flux change rate corresponding to the current time calculated by the calculating unit 402.
Alternatively, in addition to the refrigerant leakage determination device shown in fig. 3, as shown in fig. 5, the refrigerant leakage determination device further includes: an acquisition module 501 and a sending module 502;
an obtaining module 501, configured to obtain refrigerant leakage data after the second determining module 305 determines that the refrigerant leakage of the compressor occurs, where the refrigerant leakage data is used to represent a speed of the refrigerant leakage of the compressor;
a sending module 502, configured to send the refrigerant leakage data acquired by the acquiring module 501 to a server, so as to send the refrigerant leakage data to a user terminal through the server.
It should be noted that, because the contents of information interaction, execution process, and the like between the units in the apparatus are based on the same concept as the method embodiment of the present invention, specific contents may refer to the description in the method embodiment of the present invention, and are not described herein again.
The method for determining refrigerant leakage according to the embodiment of the present invention is further described in detail with reference to the following specific examples, as shown in fig. 6, the method may include the following steps:
step 601: the timer is started by a preset timer when the compressor starts.
In the embodiment of the invention, a timer is preset to time when the compressor starts, usually, the starting current of the compressor when the compressor starts is large and fluctuation is large, and if winding parameters are collected when the compressor starts, errors are easy to occur, so that when the compressor starts, a period of time is set to ensure that the starting current of the compressor is stable, then the winding parameters are collected, the collection error caused by large starting current can be avoided, and the accuracy of the judgment result of refrigerant leakage can be improved.
Specifically, a timer is first preset, and the timer can play a role of timing and alarming, and when the compressor is started, the timer counts time at the same time.
For example, a timer is installed in an air conditioner, the timer is a timing device which is formed by taking a singlechip microprocessor as a core and matching with an electronic circuit and the like, the timer can work in days or weeks and in a plurality of periods, the minimum unit of the timer is 1 second, at the moment of starting an air conditioner compressor, the timer synchronously performs timing, starts from 0 second and continuously performs timing by taking each second as an interval.
Step 602: and when the timing length of the timer reaches the preset waiting time, the winding parameters of the compressor are acquired at least twice.
In the embodiment of the invention, after the compressor is started for a period of time, the starting current of the compressor reaches a stable state, the winding parameters of the compressor are collected when the compressor normally runs, the winding parameters of any two adjacent collected windings can accurately reflect the change condition of the winding current or the winding temperature of the compressor, the winding parameter change in the running state of the compressor can be monitored in real time, and the normal running of the compressor can be ensured.
Specifically, according to the starting time of the air conditioner compressor, the waiting time of a timer is preset so that the winding parameters can be collected after the starting current of the compressor is stable, therefore, when the compressor is started, the preset timer also starts to time synchronously, when the timing length of the timer reaches the preset waiting time, the timer gives an alarm, and at the moment, the winding parameters of the compressor can be collected.
For example, it is known that after an air conditioner compressor is started for 1-2 seconds, the starting current of the compressor reaches a steady state, so that the waiting time of a timer is preset to be 2 seconds, and when the timing time reaches 2 seconds, the timer gives an alarm, at this time, the winding parameters of the compressor can be acquired at least twice, and the time interval between the two acquisitions is 1 second.
Step 603: and judging whether the difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold value range or not according to any first winding parameter and any second winding parameter which are acquired by two adjacent parameter acquisition time points in sequence.
In the embodiment of the invention, whether the difference value of the winding parameters at the adjacent moments is within the preset winding parameter difference threshold range can be judged, and further whether the compressor leaks the refrigerant can be determined.
Specifically, when the air conditioner compressor is in an operating state, the winding current of the compressor is calculated in real time, in the refrigerant leakage judgment method, the leakage condition of the refrigerant is judged by calculating the magnitude of the current value at a certain time interval by utilizing the steps of compressor current driving, current detection, current calculation and current comparison, and whether the difference value between the first winding current and the second winding current is within a preset current difference threshold value range or not is judged aiming at the first winding current and the second winding current which are collected at two adjacent moments.
For example, firstly, a corresponding relation table of driving current and compressor frequency is prestored in a refrigeration system, winding current is obtained by detecting winding parameters of an air conditioner compressor, secondly, the first winding current of an internal motor of the compressor at the 18:05:02 moment is 4.235 amperes in real time and is compared with the second winding current of 4.233 amperes at the 18:05:01 moment, and the preset current difference threshold range is 0-0.05 amperes. And finally, judging whether the current difference is within the preset current difference threshold range of 0-0.05 or not according to the difference value of 0.002 between the first winding current and the second winding current.
Whether the compressor leaks or not is judged according to the winding temperature, and the method comprises the following steps: and judging whether the difference value between the first winding temperature and the second winding temperature is within a preset second temperature difference threshold range or not according to the first winding temperature and the second winding temperature of the compressor at any two adjacent moments.
For example, when the air conditioner compressor is in an operating state, the winding temperature of the compressor is calculated in real time, firstly, when the compressor is started to operate, the first winding temperature at the moment of 18:05:06 is calculated to be 90.1 degrees, then, the second winding temperature at the moment of 18:05:07 is calculated in real time to be 92.6 degrees, the preset second temperature difference threshold value range is 0-1 degrees, and finally, whether the temperature is within the preset temperature difference threshold value range is judged according to the difference value of 2.5 degrees between the first winding temperature and the second winding temperature.
The deviation of the internal temperature of the motor is calculated by delta T-TS, wherein the TS value can be obtained in millisecond level through an algorithm, the obtained TS value magnetic flux and the change rate of the magnetic flux are calculated in real time, the magnetic flux of the compressor is collected once every interval according to preset interval time, and the ratio of the difference value between the first magnetic flux and the second magnetic flux to the second magnetic flux is used as the change rate of the magnetic flux corresponding to the current moment. TD is the temperature value inside the motor at a certain frequency, wherein the frequency of the compressor is determined by the demand of the refrigeration system and the opening of the electronic expansion valve. Further, when Δ T ≧ d, d is a baseline for determining whether rapid leakage is present or absent for the temperature difference value, d is a frequency function, d ═ f (z, Tw), z is the electronic expansion valve opening, d varies with the electronic expansion valve opening, and a confirmed refrigerant decrease determination amount, such as 80% or less of the initial refrigerant, indicates rapid leakage. Similarly, a series of refrigerant shortage baselines of 70%, 60%, and the like may be set as necessary to perform the determination. Di is formed, d80, d70, d60.... and d. varies.. f (z), respectively.
Step 604: and determining that the compressor has not leaked refrigerant if the difference between the first winding parameter and the second winding parameter is within the winding parameter difference threshold range.
In the embodiment of the invention, when the difference value between the first winding parameter and the second winding parameter is judged to be within the preset winding parameter difference threshold value range through any first winding parameter and any second winding parameter acquired at adjacent moments, the fact that the refrigerant of the compressor is not leaked is indicated, and the fact that the running state of the compressor is normal is further indicated.
Specifically, a first winding current and a second winding current of the compressor at any adjacent time are collected, and when the difference value between the first winding current and the second winding current is judged to be within a preset current difference threshold value range, it is determined that the compressor does not leak the refrigerant.
For example, the collected current of the first winding is 4.235 amperes, the current of the second winding is 4.233 amperes, the preset current difference threshold range is 0-0.05 amperes, and the difference value obtained according to the difference value of the current of the first winding and the current of the second winding is 0.002 amperes is within the preset current difference threshold range of 0-0.05 amperes, so that the compressor is indicated to have no refrigerant leakage.
And judging whether the difference value between the temperature of the first winding and the temperature of the second winding is within a preset temperature difference threshold range according to the winding temperature, acquiring the temperature of the first winding and the temperature of the second winding of the compressor at any adjacent moment, and determining that the compressor does not leak the refrigerant when judging that the difference value between the temperature of the first winding and the temperature of the second winding is within the preset temperature difference threshold range.
For example, the acquired temperature of the first winding is 90.1 degrees, the acquired temperature of the second winding is 90.6 degrees, the preset temperature difference threshold range is 0-1 degree, and if the difference value obtained according to the temperature difference between the first winding and the second winding is 0.5 degrees is within 0-1 ampere of the preset temperature difference threshold range, the compressor is indicated to have no refrigerant leakage.
Step 605: and determining that the compressor has a refrigerant leak if the difference between the first winding parameter and the second winding parameter is outside a winding parameter difference threshold range.
In the embodiment of the invention, when the difference value of the first winding parameter and the second winding parameter is judged to be out of the preset winding parameter difference threshold value range through any first winding parameter and any second winding parameter acquired at adjacent moments, the leakage of the refrigerant of the compressor is indicated, the abnormal operation of the compressor can be directly judged at the moment, and the existing faults of the compressor are solved.
Specifically, a first winding current and a second winding current of the compressor at any adjacent time are collected, and when the difference value between the first winding current and the second winding current is judged to be out of a preset current difference threshold value range, the compressor is determined to have refrigerant leakage.
For example, the collected current of the first winding is 4.235 amperes, the current of the second winding is 4.336 amperes, the preset current difference threshold range is 0-0.05 amperes, and if the difference value obtained according to the difference value of the current of the first winding and the current of the second winding is 0.101 amperes is out of the preset current difference threshold range of 0-0.05 amperes, the refrigerant leakage of the compressor is indicated.
And judging whether the difference value between the temperature of the first winding and the temperature of the second winding is within a preset temperature difference threshold range according to the winding temperature, acquiring the temperature of the first winding and the temperature of the second winding of the compressor at any adjacent moment, and determining that the refrigerant leakage occurs in the compressor when the difference value between the temperature of the first winding and the temperature of the second winding is judged to be out of the preset temperature difference threshold range.
For example, the acquired temperature of the first winding is 90.1 degrees, the acquired temperature of the second winding is 91.6 degrees, the preset temperature difference threshold range is 0-1 degree, and if the difference value obtained according to the temperature difference between the first winding and the second winding is 1.5 degrees is out of the preset temperature difference threshold range of 0-1 amperes, the refrigerant leakage of the compressor is indicated.
Step 606: and after the refrigerant leakage of the compressor is determined, the refrigerant leakage data is sent to the user terminal through the server, and the alarm reminding is completed.
In the embodiment of the invention, after the refrigerant leakage of the compressor is determined, the refrigerant leakage data is obtained, the refrigerant leakage data can reflect the refrigerant leakage speed, and the refrigerator leakage data is sent to the server, so that the server can send the refrigerant leakage data to the user terminal, and can send alarm information to a user, and the refrigerant leakage fault information can be effectively fed back to the user in time.
Specifically, after the refrigerant leakage of the compressor is determined, refrigerant leakage data is obtained, the refrigerant data can reflect the refrigerant leakage speed, the refrigerant leakage data is sent to the server, so that the server can send the refrigerant leakage data to a user terminal, the user terminal can be a mobile phone, a computer or other intelligent equipment, and the alarm mode can be carried out by adopting the modes of alarm, mobile phone vibration alarm, software alarm reminding and the like according to the leakage degree such as complete leakage, slow leakage, quick leakage and the like.
For example, after the refrigerant leakage of the air conditioner compressor is determined, the acquired refrigerant leakage data is 0.03 kg, the refrigerant leakage data when the refrigerant is completely leaked is determined to be 0.8 kg according to the leakage degree of Freon, the refrigerant leakage data when the refrigerant is slowly leaked is 0.001 kg, and the refrigerant leakage data when the refrigerant is quickly leaked is 0.01 kg, the refrigerant leakage is determined to be quick leakage, the air conditioner is stopped, and the refrigerant leakage data is sent to a user terminal through a server to complete alarm reminding.
In summary, the refrigerant leakage determination method and apparatus provided by the embodiments of the present invention at least have the following beneficial effects:
1. in the embodiment of the invention, when the compressor is started, timing is started by using a preset timer, and after the timing length of the timer reaches the preset waiting time, wherein the preset waiting time is 0.5-3 seconds, the optimal waiting time is 1-2 seconds, then the winding parameters of the compressor are acquired at least twice, wherein the winding parameters of the compressor comprise the winding temperature and the winding current of the compressor. For any first winding parameter and any second winding parameter which are sequentially acquired at two adjacent parameter acquisition time points, firstly, judging the difference value between the first winding parameter and the second winding parameter, judging whether the difference value is within a preset winding parameter difference threshold range, and determining that the compressor does not leak refrigerant when judging that the difference value is within the preset winding parameter difference threshold range; when the difference value is judged to be out of the range of the preset winding parameter difference threshold value, the refrigerant leakage of the compressor is determined, and the problem of low winding parameter measurement accuracy caused by overlarge starting current can be effectively solved because the winding parameters of the compressor are collected after the compressor is started for a certain time.
2. In the embodiment of the invention, a timer is preset to time when the compressor starts, usually, the starting current of the compressor when the compressor starts is large and fluctuation is large, and if winding parameters are collected when the compressor starts, errors are easy to occur, so that when the compressor starts, a period of time is set to ensure that the starting current of the compressor is stable, then the winding parameters are collected, the collection error caused by large starting current can be avoided, and the accuracy of the judgment result of refrigerant leakage can be improved.
3. In the embodiment of the invention, after the compressor is started for a period of time, the starting current of the compressor reaches a stable state, the winding parameters of the compressor are collected when the compressor normally runs, the winding parameters of any two adjacent collected windings can accurately reflect the change condition of the winding current or the winding temperature of the compressor, the winding parameter change in the running state of the compressor can be monitored in real time, and the normal running of the compressor can be ensured.
4. In the embodiment of the invention, whether the difference value of the winding parameters at the adjacent moments is within the preset winding parameter difference threshold range can be judged, and further whether the compressor leaks the refrigerant can be determined.
5. In the embodiment of the invention, when the difference value of the first winding parameter and the second winding parameter is judged to be within the preset winding parameter difference threshold value range through any first winding parameter and any second winding parameter acquired at adjacent moments, the fact that the refrigerant of the compressor is not leaked is indicated, and the fact that the running state of the compressor is normal is further indicated.
6. In the embodiment of the invention, when the difference value of the first winding parameter and the second winding parameter is judged to be out of the preset winding parameter difference threshold value range through any first winding parameter and any second winding parameter acquired at adjacent moments, the leakage of the refrigerant of the compressor is indicated, the abnormal operation of the compressor can be directly judged at the moment, and the existing faults of the compressor are solved.
7. In the embodiment of the invention, after the refrigerant leakage of the compressor is determined, the refrigerant leakage data is obtained, the refrigerant leakage data can reflect the refrigerant leakage speed, and the refrigerator leakage data is sent to the server, so that the server can send the refrigerant leakage data to the user terminal, and can send alarm information to a user, and the refrigerant leakage fault information can be effectively fed back to the user in time.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A refrigerant leak determination method, comprising:
starting timing by a preset timer when the compressor starts to start;
when the timing length of the timer reaches a preset waiting time, collecting winding parameters of the compressor at least twice, wherein the waiting time is 0.5-3 seconds;
aiming at any first winding parameter and any second winding parameter which are sequentially acquired at two adjacent parameter acquisition time points, judging whether the difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold value range;
determining that the compressor does not leak refrigerant if the difference between the first winding parameter and the second winding parameter is within the winding parameter difference threshold range;
determining that the compressor has a refrigerant leak if the difference between the first winding parameter and the second winding parameter is outside the winding parameter difference threshold range.
2. The method according to claim 1, wherein the waiting time is 0.5-3 seconds, and comprises:
the waiting time is 1-2 seconds;
and/or the presence of a gas in the gas,
the judging whether the difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold range includes:
aiming at a first winding current and a second winding current which are sequentially acquired from the compressor at any two adjacent parameter acquisition time points, judging whether the difference value between the first winding current and the second winding current is within a preset current difference threshold range;
determining that the compressor has not leaked refrigerant if the difference between the first winding current and the second winding current is within the current difference threshold range;
determining that the compressor has a refrigerant leak if a difference between the first winding current and the second winding current is outside the current difference threshold range.
3. The method of claim 1, wherein said determining whether the difference between the first winding parameter and the second winding parameter is within a predetermined winding parameter difference threshold comprises:
the method comprises the steps that whether the difference value between the first winding temperature and the second winding temperature is within a preset temperature difference threshold range or not is judged according to the first winding temperature and the second winding temperature which are sequentially collected from the compressor at any two adjacent parameter collection time points;
determining that the compressor has not leaked refrigerant if the difference between the first winding temperature and the second winding temperature is within the temperature difference threshold range;
determining that the compressor has a refrigerant leak if a difference between the first winding temperature and the second winding temperature is outside the temperature difference threshold range.
4. The method of claim 1, wherein the at least two acquisitions of winding parameters of the compressor comprise:
acquiring the magnetic flux of the compressor once every one interval according to preset interval time;
taking a ratio of a difference between a first magnetic flux and a second magnetic flux to the second magnetic flux as a magnetic flux change rate corresponding to a current time, wherein the first magnetic flux is the magnetic flux of the compressor acquired at the current time, and the second magnetic flux is the magnetic flux of the compressor acquired at a previous time relative to the current time;
determining the winding parameter corresponding to the current moment according to the magnetic flux change rate corresponding to the current moment, wherein the winding parameter is the winding temperature or the winding current of the compressor.
5. The method of any of claims 1-4, further comprising, after determining that the compressor has a refrigerant leak:
acquiring refrigerant leakage data, wherein the refrigerant leakage data is used for representing the speed of the compressor for generating refrigerant leakage;
transmitting the refrigerant leakage data to a server to transmit the refrigerant leakage data to a user terminal through the server.
6. A refrigerant leakage determination device, comprising: the device comprises a timing module, an acquisition module, a judgment module, a first determination module and a second determination module;
the timing module is used for starting timing through a preset timer when the compressor starts to start;
the acquisition module is used for acquiring the winding parameters of the compressor at least twice after the timing module controls the timing length of the timer to reach a preset waiting time;
the judgment module is used for judging whether the difference value between the first winding parameter and the second winding parameter is within a preset winding parameter difference threshold value range or not according to any first winding parameter and any second winding parameter which are sequentially acquired by the acquisition module at two adjacent parameter acquisition time points;
the first determining module is configured to determine that the compressor does not leak the refrigerant when the determining module determines that the difference between the first winding parameter and the second winding parameter is within the winding parameter difference threshold range;
the second determining module is configured to determine that refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding parameter and the second winding parameter is outside the winding parameter difference threshold range.
7. The apparatus of claim 6,
the judging module is used for judging whether the difference value between the first winding current and the second winding current is within a preset current difference threshold value range or not according to the first winding current and the second winding current which are sequentially collected from the compressor at any two adjacent parameter collecting time points by the collecting module;
the first determining module is configured to determine that no refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding current and the second winding current is within the current difference threshold range;
the second determining module is configured to determine that refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding current and the second winding current is outside the current difference threshold range.
8. The apparatus of claim 6,
the judging module is used for judging whether the difference value between the first winding temperature and the second winding temperature is within a preset temperature difference threshold value range or not according to the first winding temperature and the second winding temperature which are sequentially acquired from the compressor by the acquiring module at any two adjacent parameter acquiring time points;
the first determining module is configured to determine that no refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding temperature and the second winding temperature is within the temperature difference threshold range;
the second determining module is configured to determine that the refrigerant leakage occurs in the compressor when the determining module determines that the difference between the first winding temperature and the second winding temperature is outside the temperature difference threshold range.
9. The apparatus of claim 6, wherein the acquisition module comprises: the device comprises a collecting unit, a calculating unit and a determining unit;
the acquisition unit is used for acquiring the magnetic flux of the compressor once after one interval time according to the preset interval time;
the calculating unit is used for taking the ratio of the difference value between the first magnetic flux and the second magnetic flux acquired by the acquiring unit and the second magnetic flux as the magnetic flux change rate corresponding to the current moment;
the determining unit is used for determining the compressor winding parameter corresponding to the current moment according to the magnetic flux change rate corresponding to the current moment calculated by the calculating unit.
10. The apparatus of any of claims 6 to 9, further comprising: the device comprises an acquisition module and a sending module;
the obtaining module is configured to obtain refrigerant leakage data after the second determining module determines that the compressor has refrigerant leakage, where the refrigerant leakage data is used to characterize a speed of the compressor at which the refrigerant leakage occurs;
the sending module is used for sending the refrigerant leakage data acquired by the acquiring module to a server so as to send the refrigerant leakage data to a user terminal through the server.
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