CN109631435B - Refrigerant charging system and method - Google Patents
Refrigerant charging system and method Download PDFInfo
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- CN109631435B CN109631435B CN201910032115.1A CN201910032115A CN109631435B CN 109631435 B CN109631435 B CN 109631435B CN 201910032115 A CN201910032115 A CN 201910032115A CN 109631435 B CN109631435 B CN 109631435B
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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Abstract
The invention relates to the field of refrigeration system maintenance, and provides a refrigerant filling method aiming at the problem of complexity of the existing refrigerant filling method, which comprises the following steps: sending a filling instruction to a filling device and a refrigerating system to be filled with refrigerant, and filling the refrigerant into a part to be filled according to the filling instruction; acquiring the ambient temperature, the exhaust temperature of a compressor and the winding temperature of a motor of the compressor after the refrigeration system operates according to the corresponding charging operation condition according to a charging instruction in real time, recording the temperature difference between the winding temperature and the exhaust temperature as an actual temperature difference, and acquiring the corresponding relation between the predicted preset operation condition and the temperature difference of the refrigeration system with the target amount of refrigerant under the preset operation condition; obtaining the predicted temperature difference of the refrigerating system with the target refrigerant quantity under the filling operation condition according to the corresponding relation; and judging whether the actual temperature difference is matched with the expected temperature difference, and if so, sending a stopping instruction to the charging device to stop charging the refrigerant. The invention is suitable for filling the refrigerant.
Description
Technical Field
The invention relates to the technical field of refrigeration system maintenance, in particular to a refrigerant filling system and a refrigerant filling method.
Background
The refrigeration system is formed by connecting and sealing a compressor, a condenser, a throttling device, an evaporator and other components through metal pipes, and filling a refrigerant into the compressor, wherein the compressor is usually mainly totally enclosed, and the process from air suction to air exhaust of the compressor is realized through the operation of a motor. The amount of refrigerant is appropriate, and it is not large or small. The reduction of the refrigerant can cause the reduction of the system performance and the reduction of the energy efficiency ratio; if reduced more, it may also cause damage to the compressor motor, which may eventually lead to motor burnout, or motor turn-to-turn short circuits and compressor shell charging. Likewise, excessive refrigerant charge in a refrigeration system can also result in reduced system performance and energy efficiency. In fact, during installation, the piping may increase in length, and in this case, the performance of the refrigeration system may be deteriorated if the refrigerant is not added. In another situation, the refrigerant system is starved of refrigerant due to improper installation, or the system itself has leaks or trips, which may require replenishment of a certain amount of refrigerant. The existing refrigerant charging method is as follows.
Patent application No. 200510073800.7 discloses a refrigerant supply device that makes a configuration for filling a refrigerant container with gaseous refrigerant relatively compact and improves the heating efficiency of liquid refrigerant. In this refrigerant supply device, the liquid refrigerant in the refrigerant container is pumped by the pressure pump and supplied to the product through the supply pipe. A feedback pipe branching from the supply pipe and passing through the refrigerant container is provided downstream of the pressure pump. The liquid refrigerant flowing through the feedback pipe is heated and vaporized by a heater included in the refrigerant heating device, and the vaporized gas refrigerant is reduced in pressure by a pressure reducing valve included in the device. A pressure gauge for measuring the pressure of the refrigerant in the tank is provided in the tank provided in the supply pipe. The refrigerant container is provided with a temperature sensor for detecting the temperature of the refrigerant container. The control panel controls the heater according to the detected refrigerant pressure and container temperature.
Still like application number 201220377014.1's utility model discloses an automatic device that adds for air conditioner refrigerant, including refrigerant steel bottle and automatic control mechanism, the refrigerant steel bottle is equipped with pressure sensor, temperature sensor and weighing sensor outward respectively, the inner chamber bottom of refrigerant steel bottle is equipped with the heater, pressure sensor, temperature sensor, weighing sensor and heater all link to each other with automatic control mechanism, automatic control mechanism still links to each other with the high-pressure tee bend stop valve and the low pressure tee bend stop valve of air conditioner respectively. The utility model discloses an automatic add device not only can adapt to all kinds of refrigeration plant's refrigerant ration and add, but also can be connected on line with the air conditioning equipment who has the microleakage refrigerant, annotates the refrigerant of leaking according to the operating condition on an irregular basis, maintains air conditioning equipment normal operating. The utility model discloses a pressure that the refrigerant pipeline that the sensor obtained is pushed down to the fixed temperature is guaranteed to the heater heating refrigerant steel bottle is certain, learns the volume of the refrigerant of input through weighing sensor, and this scheme is more loaded down with trivial details.
Further, as disclosed in the patent application No. 201510830465.4, a refrigeration system with fill level monitoring has a compressor, a condenser or gas cooler, an expansion device and an evaporator device. When the compressor is off, the method comprises the steps of: measuring at least one temperature, measuring a refrigerant pressure in the refrigeration system; determining a refrigerant charge error, in particular a refrigerant deficiency, if the measured pressure is outside a nominal pressure range, wherein the nominal pressure of the refrigerant is determined on the basis of the measured temperature and the nominal pressure range comprises pressure values which deviate at most from the nominal pressure by a specified tolerance. When the compressor is turned on, the method comprises the steps of: measuring at least one temperature; measuring the refrigerant pressure at the outlet of the condenser or gas cooler; a refrigerant charge error, in particular a refrigerant deficiency, is established if the measured pressure is outside a nominal pressure range, wherein the nominal pressure of the refrigerant is determined on the basis of the measured temperature, and the nominal pressure range comprises pressure values at which the pressure values deviate at most from the nominal pressure by a specified tolerance. The device according to the invention further comprises a storage container which stores refrigerant, as well as refrigerant, in particular carbon dioxide, which operates in a transcritical range depending on the operating point, wherein at least one refrigerant temperature sensor and at least one refrigerant pressure sensor are provided for measuring the temperature and pressure of the refrigerant, wherein the temperature and pressure of the refrigerant can be evaluated in the control unit in such a way that a refrigerant charge error is detectable, and if an insufficiency is detected, the control unit causes a filling by means of a control intervention on the refrigerant circuit.
According to the technical scheme, although the refrigerant can be filled, the refrigerant filling device has high subjectivity, is easily influenced by environmental factors, and needs to use the heater and the pressure sensor, and when the refrigerant steel cylinder is replaced, the replacement operation is troublesome due to the heater.
Another method is to evacuate the refrigerant of the whole refrigeration system, re-evacuate the refrigeration system, weigh the refrigerant according to the nameplate, and fill the refrigerant with an electronic scale. The weighing method is long in time and high in cost, and the problem of how to increase the refrigerant after the installation pipeline is lengthened cannot be solved, so that only one approximate estimated value can be adopted.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem that a system for supplementing the refrigerant in the prior art is too complex is solved, and a refrigerant charging system and a method are provided.
The invention solves the technical problems and adopts the technical scheme that:
the interactive component is used for sending a charging instruction to the charging device and the refrigerating system to be charged with the refrigerant according to the interaction of a user;
the charging device is used for charging the refrigerant into the part to be charged according to the charging instruction and stopping charging the refrigerant into the part to be charged according to the stopping instruction;
the acquisition module is used for acquiring the ambient temperature, the exhaust temperature of the compressor and the winding temperature of the motor of the compressor after the refrigeration system operates according to the corresponding charging operation condition according to the charging instruction in real time, and also used for acquiring the corresponding relation between the preset operation condition obtained by the pre-test and the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with the target amount of refrigerant under the preset operation condition;
the control module is used for calculating the temperature difference between the winding temperature and the exhaust temperature when the refrigerant is filled, recording the temperature difference as an actual temperature difference, and obtaining the temperature difference between the winding temperature and the exhaust temperature predicted by the refrigeration system with the refrigerant amount as a target amount under the filling operation condition according to the corresponding relation, and recording the temperature difference as a predicted temperature difference; and judging whether the actual temperature difference is matched with the expected temperature difference, and if so, sending a stopping instruction to the filling device.
Preferably, the preset operating condition includes an operating frequency of the compressor and/or an ambient temperature.
Further, the obtaining module is further configured to obtain a first corresponding relationship between a temperature difference between a winding temperature and an exhaust temperature of the refrigeration system under the preset operating condition, where the preset operating condition and the refrigerant amount are target amounts in different proportions; the control module is further used for obtaining the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with the target quantities of different proportions of the refrigerant quantity according to the corresponding relation, recording the temperature difference as a first expected temperature difference, and sending the proportion of the refrigerant quantity corresponding to the first expected temperature difference with the minimum actual temperature difference as the proportion of the refrigerant quantity in the refrigeration system needing to be supplemented with the refrigerant to an interactive component for displaying.
Preferably, the control module further comprises a judging unit, wherein the judging unit is used for judging whether the absolute value of the difference value between the actual temperature difference and the expected temperature difference is less than or equal to a preset difference value, and if so, matching is performed; or judging whether the absolute value of the difference value between the actual temperature difference and the predicted temperature difference is smaller than or equal to the predicted temperature difference with the preset proportion, and if so, matching.
Preferably, the charging device comprises a pipeline connected with a liquid storage tank for storing the refrigerant, a charging module and a control unit;
the filling module is connected with a liquid storage tank for storing the refrigerant through a pipeline and is used for filling the refrigerant in the storage component into a component to be filled;
the control unit is used for receiving the filling instruction, opening a valve of the filling module according to the filling instruction to enable the filling module to fill the refrigerant into the part to be filled, receiving the stopping instruction, and closing the valve of the filling module according to the stopping instruction to enable the filling module to stop filling the refrigerant into the part to be filled.
A method corresponding to the above refrigerant charging system, comprising:
the interactive part sends a filling instruction to the filling device and the refrigeration system to be filled with the refrigerant according to the interaction of the user, and the filling device fills the refrigerant into the part to be filled according to the filling instruction;
the acquisition module acquires the ambient temperature, the exhaust temperature of the compressor and the winding temperature of a motor of the compressor after the refrigeration system operates according to the corresponding charging operation condition according to the charging instruction in real time, and acquires the corresponding relation between the preset operation condition obtained by pre-testing and the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with the target amount of refrigerant under the preset operation condition;
the control module calculates the temperature difference between the winding temperature and the exhaust temperature when the refrigerant is filled, records the temperature difference as the actual temperature difference, and obtains the temperature difference between the winding temperature and the exhaust temperature which is predicted by the refrigeration system with the refrigerant amount as the target amount under the filling operation condition according to the corresponding relation, and records the temperature difference as the predicted temperature difference; and judging whether the actual temperature difference is matched with the expected temperature difference, if so, sending a stopping instruction to a filling device, and stopping filling the refrigerant into the to-be-filled part by the filling device according to the stopping instruction.
Preferably, the preset operating condition includes a compressor operating frequency and/or an ambient temperature;
when the preset operating condition includes the compressor operating frequency and does not include the ambient temperature, before filling the refrigerant, the method further includes: obtaining the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant under different compressor operating frequencies to obtain the corresponding relation between the compressor operating frequency and the temperature difference;
when the preset operating condition includes an ambient temperature and does not include the compressor operating frequency, before charging the refrigerant, further comprising: obtaining the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant at different environmental temperatures to obtain the corresponding relation between the environmental temperature and the temperature difference;
when the preset operation conditions include the compressor operation frequency and the ambient temperature, before filling the refrigerant, the method further comprises the following steps: and obtaining the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant under different compressor operating frequencies and different ambient temperatures, and obtaining the corresponding relation between the ambient temperature and the compressor operating frequency and the temperature difference.
Preferably, the correspondence includes: a corresponding table of the preset operation condition and the temperature difference and/or a functional relation of the preset operation condition and the temperature difference;
when the corresponding relation is a corresponding table of preset operation conditions and temperature differences, the predicted temperature difference is the temperature difference corresponding to the preset operation condition with the minimum difference of the charging operation conditions; and when the corresponding relation is a functional relation between the preset operation condition and the temperature difference, the predicted temperature difference is the temperature difference obtained by substituting the relevant data of the charging operation condition as the relevant data of the preset operation condition into the functional relation.
Further, the corresponding relationship also includes a corresponding relationship between a preset operating condition and a temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with target quantities of different proportions of the refrigerant quantity under the preset operating condition;
when filling refrigerant, the method also comprises the following steps: obtaining the temperature difference between the winding temperature and the exhaust temperature predicted by the refrigerating system with the refrigerant amount of different proportions and target amount under the filling operation condition according to the corresponding relation, and recording as the predicted temperature difference; and sending the proportion of the refrigerant amount corresponding to the estimated temperature difference with the minimum difference from the actual temperature difference to an interactive component for displaying as the proportion of the refrigerant amount in the refrigeration system needing to be supplemented with the refrigerant.
Preferably, before filling with the refrigerant, the method further comprises:
and acquiring the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the refrigerant amount of different proportions of target amount under the preset operation condition, and acquiring the corresponding relation between the preset operation condition and the temperature difference under the target amount with the refrigerant amount of different proportions.
The invention has the beneficial effects that:
the invention judges whether the quantity of the refrigerant is proper or not by judging whether the temperature difference between the winding temperature of the motor and the exhaust temperature of the compressor is matched with the corresponding predicted temperature difference under the charging operation condition or not, wherein the predicted temperature difference is obtained according to the corresponding relation between the preset operation condition tested by a pre-test and the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with the target quantity of the refrigerant under the preset operation condition. The refrigerant charging device can conveniently judge whether the refrigerant charging amount is proper or not according to the temperature difference between the winding temperature and the exhaust temperature of the compressor under the charging operation condition, and is suitable for judging whether the refrigerant is properly charged or not under the charging operation condition. Meanwhile, only the relevant temperature needs to be acquired, the hardware cost of the system is low, the system is convenient to implement, the refrigeration system does not need to be additionally heated and the like, the filling progress of the air conditioner refrigerant is accelerated, and the requirement on maintenance personnel is reduced.
Drawings
FIG. 1 is a schematic diagram of a system configuration according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the refrigerant charging system comprises an interactive component, a charging device, an acquisition module and a control module;
the interactive component is used for sending a charging instruction to the charging device and the refrigerating system to be charged with the refrigerant according to the interaction of a user;
the charging device is used for charging the refrigerant into the part to be charged according to the charging instruction and stopping charging the refrigerant into the part to be charged according to the stopping instruction;
the acquisition module is used for acquiring the ambient temperature, the exhaust temperature of the compressor and the winding temperature of the motor of the compressor after the refrigeration system operates according to the corresponding charging operation condition according to the charging instruction in real time, and also used for acquiring the corresponding relation between the preset operation condition obtained by the pre-test and the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with the target amount of refrigerant under the preset operation condition;
the control module is used for calculating the temperature difference between the winding temperature and the exhaust temperature when the refrigerant is filled, recording the temperature difference as an actual temperature difference, and obtaining the temperature difference between the winding temperature and the exhaust temperature predicted by the refrigeration system with the refrigerant amount as a target amount under the filling operation condition according to the corresponding relation, and recording the temperature difference as a predicted temperature difference; and judging whether the actual temperature difference is matched with the expected temperature difference, and if so, sending a stopping instruction to the filling device.
The corresponding relation can be pre-stored after a prototype of the refrigeration system is tested in an enthalpy difference laboratory in advance, the pre-stored medium can be a filling system or a mobile storage medium such as a U disk, or the corresponding relation is placed to a server and obtained from the server or printed in an entity manual, and a maintenance worker manually judges whether the actual temperature difference is matched with the predicted temperature difference or not. The target amount generally refers to the condition that the refrigerant amount is 100%, and if special requirements exist, corresponding establishment can be carried out according to the special requirements.
The compressor motor can be a direct current variable frequency motor; the interactive component and the control module are both communicated with an electric control main component in the refrigeration system, the exhaust temperature of the compressor can be the temperature of an exhaust port of the compressor or the temperature of any position on an exhaust pipe, the temperature can be obtained by obtaining the exhaust temperature tested by a sensor of the refrigeration system, the winding temperature of a motor of the compressor can be calculated by obtaining the change rate of the magnetic flux of a winding of the motor tested by the refrigeration system, the method is the prior art, and particularly can be referred to the invention application document with the application number of 201610808947.4, and the real-time obtaining can be realized by obtaining related parameters of the refrigeration system in millisecond level.
When the actual temperature difference matches the expected temperature difference, indicating that the amount of refrigerant substantially reaches the target amount, the charging component can be notified to stop charging, at which point the amount of refrigerant in the refrigerant system substantially meets its operational requirements under charging operating conditions, otherwise the charging component can continue to charge normally. The filling operation condition can be set in the filling system and sent to the refrigerating system by the filling system, the refrigerating system operates according to the filling operation condition, or is prefabricated in the refrigerating system, the refrigerating system operates according to the prefabricated filling operation condition after receiving a filling instruction of the filling system, the filling operation condition can include the operation frequency of a compressor, the refrigerating system generally operates an air conditioner through an access hole of a stop valve outside an outdoor unit body in a refrigerating mode to fill gaseous refrigerant when supplementing the refrigerant, and the refrigerating system can operate according to the same opening degree of the expansion valve as that under the preset operation condition when filling the refrigerant when the expansion valve exists; when the preset operating condition is consistent with the charging operating condition, the predicted temperature difference may directly employ the temperature difference between the winding temperature and the discharge temperature under the preset operating condition.
Preferably, the filling device comprises a pipeline connected with a liquid storage tank for storing the refrigerant, a filling module and a control unit;
the filling module is connected with a liquid storage tank for storing the refrigerant through a pipeline and is used for filling the refrigerant in the storage component into a component to be filled;
the control unit is used for receiving a filling instruction, opening a valve of the filling module according to the filling instruction, enabling the filling module to fill the refrigerant into the part to be filled, receiving a stopping instruction, closing the valve of the filling module according to the stopping instruction, and enabling the filling module to stop filling the refrigerant into the part to be filled.
Wherein the filling module can be a filling tube or a filling gun.
In view of the difficulty in ensuring that the charging operating conditions are consistent with the preset operating conditions when replenishing the refrigerant, mainly due to differences in the compressor operating frequency and/or the ambient temperature, the preset operating conditions may include the compressor operating frequency and/or the ambient temperature at the time of the preliminary test in order to adapt the predicted temperature difference to the charging operating conditions; accordingly, charge operating conditions include compressor operating frequency and/or ambient temperature when charging refrigerant.
When actually supplementing the refrigerant, the refrigerant can be supplemented when the operation frequency of the compressor is the rated operation frequency and/or the maximum operation frequency, and the appropriate amount of the refrigerant under the corresponding operation frequency is ensured.
The acquisition module is further used for acquiring a first corresponding relation of temperature differences between the winding temperature and the exhaust temperature of the refrigeration system, of which the preset operation condition and the refrigerant quantity are target quantities in different proportions, under the preset operation condition; the control module is also used for obtaining the temperature difference between the predicted winding temperature and the exhaust temperature of the refrigerating system with the refrigerant quantity of different proportions under the filling operation condition according to the corresponding relation, recording the temperature difference as a first predicted temperature difference, and sending the proportion of the refrigerant quantity corresponding to the first predicted temperature difference with the minimum actual temperature difference as the proportion of the refrigerant quantity in the refrigerating system needing to be supplemented with the refrigerant to an interactive component for displaying.
In order to use different use requirements, the control module further comprises a judging unit, wherein the judging unit is used for judging whether the absolute value of the difference value between the actual temperature difference and the predicted temperature difference is smaller than or equal to a preset difference value or not, and if so, matching is carried out; or judging whether the absolute value of the difference value between the actual temperature difference and the predicted temperature difference is smaller than or equal to the predicted temperature difference with the preset proportion, and if so, matching.
As shown in fig. 2, a method corresponding to the above-described refrigerant charging system includes:
the interactive part sends a filling instruction to the filling device and the refrigeration system to be filled with the refrigerant according to the interaction of the user, and the filling device fills the refrigerant into the part to be filled according to the filling instruction;
the acquisition module acquires the ambient temperature, the exhaust temperature of the compressor and the winding temperature of a motor of the compressor after the refrigeration system operates according to the corresponding charging operation condition according to the charging instruction in real time, and acquires the corresponding relation between the preset operation condition obtained by pre-testing and the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with the target amount of refrigerant under the preset operation condition;
the control module calculates the temperature difference between the winding temperature and the exhaust temperature when the refrigerant is filled, records the temperature difference as the actual temperature difference, and obtains the temperature difference between the winding temperature and the exhaust temperature which is predicted by the refrigeration system with the refrigerant amount as the target amount under the filling operation condition according to the corresponding relation, and records the temperature difference as the predicted temperature difference; and judging whether the actual temperature difference is matched with the expected temperature difference, if so, sending a stopping instruction to a filling device, and stopping filling the refrigerant into the to-be-filled part by the filling device according to the stopping instruction.
The corresponding relation can be pre-stored after a prototype of the refrigeration system is tested in an enthalpy difference laboratory in advance, the pre-stored medium can be a filling system or a mobile storage medium such as a U disk, or the corresponding relation is placed to a server and obtained from the server or printed in an entity manual, and a maintenance worker manually judges whether the actual temperature difference is matched with the predicted temperature difference or not. The target amount generally refers to the condition that the refrigerant amount is 100%, and if special requirements exist, corresponding establishment can be carried out according to the special requirements.
The compressor motor can be a direct current variable frequency motor; the interactive component and the control module are both communicated with an electric control main component in the refrigeration system, the exhaust temperature of the compressor can be the temperature of an exhaust port of the compressor or the temperature of any position on an exhaust pipe, the temperature can be obtained by obtaining the exhaust temperature tested by a sensor of the refrigeration system, the winding temperature of a motor of the compressor can be calculated by obtaining the change rate of the magnetic flux of a winding of the motor tested by the refrigeration system, the method is the prior art, and particularly can be referred to the invention application document with the application number of 201610808947.4, and the real-time obtaining can be realized by obtaining related parameters of the refrigeration system in millisecond level.
When the actual temperature difference matches the expected temperature difference, indicating that the amount of refrigerant substantially reaches the target amount, the charging component can be notified to stop charging, at which point the amount of refrigerant in the refrigerant system substantially meets its operational requirements under charging operating conditions, otherwise the charging component can continue to charge normally. The filling operation condition can be set in the filling system and sent to the refrigerating system by the filling system, the refrigerating system operates according to the filling operation condition, or is prefabricated in the refrigerating system, the refrigerating system operates according to the prefabricated filling operation condition after receiving a filling instruction of the filling system, the filling operation condition can include the operation frequency of a compressor, the refrigerating system generally operates an air conditioner through an access hole of a stop valve outside an outdoor unit body in a refrigerating mode to fill gaseous refrigerant when supplementing the refrigerant, and the refrigerating system can operate according to the same opening degree of the expansion valve as that under the preset operation condition when filling the refrigerant when the expansion valve exists; when the preset operating condition is consistent with the charging operating condition, the predicted temperature difference may directly employ the temperature difference between the winding temperature and the discharge temperature under the preset operating condition.
In view of the difficulty in ensuring that the charging operating conditions are consistent with the preset operating conditions when replenishing the refrigerant, mainly due to differences in the compressor operating frequency and/or the ambient temperature, the preset operating conditions may include the compressor operating frequency and/or the ambient temperature at the time of the preliminary test in order to adapt the predicted temperature difference to the charging operating conditions; accordingly, charge operating conditions include compressor operating frequency and/or ambient temperature when charging refrigerant.
When actually supplementing the refrigerant, the refrigerant can be supplemented when the operation frequency of the compressor is the rated operation frequency and/or the maximum operation frequency, and the appropriate amount of the refrigerant under the corresponding operation frequency is ensured.
Therefore, it is necessary to obtain a corresponding correspondence in advance, and the method specifically includes:
when the preset operating condition includes the compressor operating frequency and does not include the ambient temperature, the charging the refrigerant may further include: obtaining the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant under different compressor operating frequencies to obtain the corresponding relation between the compressor operating frequency and the temperature difference; this situation is suitable for setting the ambient temperature of the refrigeration system to be exactly the same as the ambient temperature in the preset operating conditions when the refrigerant is replenished;
when the preset operating condition includes an ambient temperature and does not include the compressor operating frequency, the charging the refrigerant may further include: obtaining the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant at different environmental temperatures to obtain the corresponding relation between the environmental temperature and the temperature difference; this is the case when the refrigerant is replenished by setting the refrigeration system to operate at the compressor operating frequency under the preset operating conditions;
when the preset operating conditions include the compressor operating frequency and the ambient temperature, the step of charging the refrigerant may further include: the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant under different compressor operating frequencies and different environmental temperatures is obtained, and the corresponding relation between the environmental temperature and the compressor operating frequency and the temperature difference is obtained, so that the corresponding relation can adapt to any actual operating conditions.
The method comprises the steps of testing the enthalpy difference chamber in advance, storing the corresponding relation, wherein the hardware of a prototype is consistent with the hardware of the refrigerating system needing to be filled with the refrigerant, the step can be carried out in the enthalpy difference chamber, the storage of the corresponding relation can be placed in the refrigerating system or a server, for example, the filling system is directly connected with the refrigerating system to obtain the corresponding relation stored in the refrigerating system, or the filling system is scanned to obtain the model of the refrigerating system before being filled with the refrigerant, and the corresponding relation is downloaded from the server according to the model.
To accommodate different needs, the correspondence may include: a correspondence table of the preset operating conditions and the temperature difference and/or a functional relationship of the preset operating conditions and the temperature difference.
Specifically, when the correspondence is a correspondence table of the preset operation condition and the temperature difference, the predicted temperature difference is the temperature difference corresponding to the preset operation condition having the smallest difference with the charging operation condition; and when the corresponding relation is a functional relation between the preset operation condition and the temperature difference, the predicted temperature difference is the temperature difference obtained by substituting the relevant data of the charging operation condition as the relevant data of the preset operation condition into the functional relation.
Regarding the functional relationship, the following can be expressed:
when the preset operating condition includes the compressor operating frequency and does not include the ambient temperature, the corresponding functional relationship may be noted as z ═ f1(x) Z is the temperature difference and x is the compressor operating frequency; the corresponding functional relation can be subjected to curve fitting calculation through discrete values of x and z obtained under a preset condition, and the corresponding algorithm is the existing algorithm.
When the preset operating condition includes the ambient temperature and does not include the operating frequency of the compressor, the corresponding functional relationship may be recorded as z ═ f2(y), z is the temperature difference, y is the ambient temperature; the corresponding functional relation can be subjected to curve fitting calculation through the discrete values of y and z obtained under the preset condition, and the corresponding algorithm is the existing algorithm.
When the preset operating conditions include the compressor operating frequency and the ambient temperature, the corresponding functional relationship may be expressed as z ═ f3(x, y), z is the temperature difference, x is the compressor operating frequency, and y is the ambient temperature; the corresponding function relation can be calculated by surface fitting according to discrete values of x, y and z obtained under preset conditions, the corresponding algorithm is the existing algorithm, and least square can be adoptedThe method is carried out.
In order to facilitate the checking and judgment of maintenance personnel, the proportion of the refrigerant quantity can be displayed, and the corresponding relationship can also comprise the corresponding relationship of the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system, of which the preset operation condition and the refrigerant quantity are target quantities in different proportions, under the preset operation condition; when filling refrigerant, the method also comprises the following steps: obtaining the temperature difference between the winding temperature and the exhaust temperature predicted by the refrigerating system with the refrigerant amount of different proportions and target amount under the filling operation condition according to the corresponding relation, and recording as the predicted temperature difference; and sending the proportion of the refrigerant amount corresponding to the estimated temperature difference with the minimum difference from the actual temperature difference to an interactive component for displaying as the proportion of the refrigerant amount in the refrigeration system needing to be supplemented with the refrigerant.
Correspondingly, before filling the refrigerant, the method further comprises the following steps:
and acquiring the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the refrigerant amount of different proportions of target amount under the preset operation condition, and acquiring the corresponding relation between the preset operation condition and the temperature difference under the target amount with the refrigerant amount of different proportions.
When the correspondence relationship is a functional relationship and when the preset operation condition includes the compressor operation frequency and the ambient temperature, the correspondence relationship may be expressed as zd＝f4(xd,yd)，zdIs the predicted temperature difference, x, at a ratio d of the refrigerant quantitydFor the compressor operating frequency at d refrigerant quantity, ydThe ambient temperature at which the proportion of refrigerant quantity is d, d ∈ (0, 1)](ii) a That is to say zdThe number of the d is consistent with the number of the refrigerant amount ratio d, the interval of the d can be set to be 10%, namely, the refrigerant amount is respectively set to be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% of target amount, and the corresponding relation under other preset operation conditions can be analogized.
To use different usage requirements, the determining whether the actual temperature difference matches the expected temperature difference includes:
judging whether the absolute value of the difference value between the actual temperature difference and the predicted temperature difference is less than or equal to a preset difference value, and if so, matching;
or judging whether the absolute value of the difference value between the actual temperature difference and the predicted temperature difference is smaller than or equal to the predicted temperature difference with the preset proportion, and if so, matching.
Wherein, considering the error influence of the fitting, the preset proportion can be set as 100% minus the corresponding fitting degree in the fitting calculation.
Claims (8)
1. A refrigerant charging system, comprising:
the interactive component is used for sending a charging instruction to the charging device and the refrigerating system to be charged with the refrigerant according to the interaction of a user;
the charging device is used for charging the refrigerant into the part to be charged according to the charging instruction and stopping charging the refrigerant into the part to be charged according to the stopping instruction;
the acquisition module is used for acquiring the ambient temperature, the exhaust temperature of the compressor and the winding temperature of the motor of the compressor after the refrigeration system operates according to the corresponding charging operation condition according to the charging instruction in real time, and also used for acquiring the corresponding relation between the preset operation condition obtained by the pre-test and the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with the target amount of refrigerant under the preset operation condition;
the control module is used for calculating the temperature difference between the winding temperature and the exhaust temperature when the refrigerant is filled, recording the temperature difference as an actual temperature difference, and obtaining the temperature difference between the winding temperature and the exhaust temperature predicted by the refrigeration system with the refrigerant amount as a target amount under the filling operation condition according to the corresponding relation, and recording the temperature difference as a predicted temperature difference; judging whether the actual temperature difference is matched with the predicted temperature difference or not, and if so, sending a stopping instruction to a filling device;
the acquisition module is further used for acquiring a first corresponding relation between the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system, wherein the preset operation condition and the target quantity of the refrigerant in different proportions are obtained; the control module is further used for obtaining the temperature difference between the winding temperature and the exhaust temperature of the refrigerating system with the refrigerant quantity of different proportions and the target quantity under the filling operation condition according to the first corresponding relation, recording the temperature difference as a first expected temperature difference, and sending the proportion of the refrigerant quantity corresponding to the first expected temperature difference with the minimum actual temperature difference as the proportion of the refrigerant quantity in the refrigerating system needing to be supplemented with the refrigerant to an interactive component for displaying.
2. The refrigerant charging system of claim 1, wherein the preset operating conditions include a compressor operating frequency and/or an ambient temperature.
3. The refrigerant charging system as recited in claim 1 or 2, wherein said control module further comprises a judging unit for judging whether an absolute value of a difference between the actual temperature difference and the expected temperature difference is less than or equal to a preset difference, and if so, matching; or judging whether the absolute value of the difference value between the actual temperature difference and the predicted temperature difference is smaller than or equal to the predicted temperature difference with the preset proportion, and if so, matching.
4. The refrigerant charging system as set forth in claim 1, wherein said charging device includes a line connected to a receiver tank storing refrigerant, a charging module and a control unit;
the filling module is connected with a liquid storage tank for storing the refrigerant through a pipeline and is used for filling the refrigerant in the storage component into a component to be filled;
the control unit is used for receiving the filling instruction, opening a valve of the filling module according to the filling instruction to enable the filling module to fill the refrigerant into the part to be filled, receiving the stopping instruction, and closing the valve of the filling module according to the stopping instruction to enable the filling module to stop filling the refrigerant into the part to be filled.
5. A method of applying to a refrigerant charging system as set forth in claim 1, comprising:
the interactive part sends a filling instruction to the filling device and the refrigeration system to be filled with the refrigerant according to the interaction of the user, and the filling device fills the refrigerant into the part to be filled according to the filling instruction;
the acquisition module acquires the ambient temperature, the exhaust temperature of the compressor and the winding temperature of a motor of the compressor after the refrigeration system operates according to the corresponding charging operation condition according to the charging instruction in real time, and acquires the corresponding relation between the preset operation condition obtained by pre-testing and the temperature difference between the winding temperature and the exhaust temperature of the refrigeration system with the target amount of refrigerant under the preset operation condition;
the control module calculates the temperature difference between the winding temperature and the exhaust temperature when the refrigerant is filled, records the temperature difference as the actual temperature difference, and obtains the temperature difference between the winding temperature and the exhaust temperature which is predicted by the refrigeration system with the refrigerant amount as the target amount under the filling operation condition according to the corresponding relation, and records the temperature difference as the predicted temperature difference; judging whether the actual temperature difference is matched with the predicted temperature difference, if so, sending a stopping instruction to a filling device, and stopping filling the refrigerant into the to-be-filled part by the filling device according to the stopping instruction;
the corresponding relation also comprises a first corresponding relation of the temperature difference between the winding temperature and the exhaust temperature of the refrigerating system, wherein the preset operating condition and the refrigerant quantity are target quantities in different proportions under the preset operating condition;
when filling refrigerant, the method also comprises the following steps: obtaining the temperature difference between the winding temperature and the exhaust temperature predicted by the refrigerating system with the refrigerant amount of different proportions and target amount under the filling operation condition according to the first corresponding relation, and recording as a first predicted temperature difference; and sending the proportion of the refrigerant quantity corresponding to the first expected temperature difference with the minimum difference with the actual temperature difference to an interactive component for displaying as the proportion of the refrigerant quantity in the refrigeration system needing to be supplemented with the refrigerant.
6. The method of claim 5, wherein the preset operating conditions include compressor operating frequency and/or ambient temperature;
when the preset operating condition includes the compressor operating frequency and does not include the ambient temperature, before filling the refrigerant, the method further includes: obtaining the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant under different compressor operating frequencies to obtain the corresponding relation between the compressor operating frequency and the temperature difference;
when the preset operating condition includes an ambient temperature and does not include the compressor operating frequency, before charging the refrigerant, further comprising: obtaining the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant at different environmental temperatures to obtain the corresponding relation between the environmental temperature and the temperature difference;
when the preset operation conditions include the compressor operation frequency and the ambient temperature, before filling the refrigerant, the method further comprises the following steps: and obtaining the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the target amount of the refrigerant under different compressor operating frequencies and different environmental temperatures, and obtaining the corresponding relation between the environmental temperature and the compressor operating frequency and the temperature difference.
7. The method of claim 6, wherein the correspondence comprises: a corresponding table of the preset operation condition and the temperature difference and/or a functional relation of the preset operation condition and the temperature difference;
when the corresponding relation is a corresponding table of preset operation conditions and temperature differences, the predicted temperature difference is the temperature difference corresponding to the preset operation condition with the minimum difference of the charging operation conditions; and when the corresponding relation is a functional relation between the preset operation condition and the temperature difference, the predicted temperature difference is the temperature difference obtained by substituting the relevant data of the charging operation condition as the relevant data of the preset operation condition into the functional relation.
8. The method of claim 5, wherein prior to charging the refrigerant, further comprising:
and acquiring the temperature difference between the winding temperature and the exhaust temperature of a prototype of the refrigerating system with the refrigerant amount of different proportions of target amount under the preset operation condition, and acquiring the corresponding relation between the preset operation condition and the temperature difference under the target amount with the refrigerant amount of different proportions.
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