CN110567210B - Automatic control method and device for refrigerant filling amount of water chilling unit and water chilling unit - Google Patents
Automatic control method and device for refrigerant filling amount of water chilling unit and water chilling unit Download PDFInfo
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- CN110567210B CN110567210B CN201910871914.8A CN201910871914A CN110567210B CN 110567210 B CN110567210 B CN 110567210B CN 201910871914 A CN201910871914 A CN 201910871914A CN 110567210 B CN110567210 B CN 110567210B
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 152
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000010977 unit operation Methods 0.000 claims abstract description 28
- 238000001704 evaporation Methods 0.000 claims description 26
- 230000008020 evaporation Effects 0.000 claims description 25
- 230000010412 perfusion Effects 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000005429 filling process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/05—Refrigerant levels
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Abstract
The invention discloses a method and a device for automatically controlling the refrigerant filling amount of a water chilling unit and the water chilling unit. Wherein, the method comprises the following steps: acquiring unit operation parameters; judging whether the unit operation parameters meet preset conditions or not; and controlling the filling amount of the refrigerant according to the judgment result. The invention realizes the automatic adjustment and matching of the filling amount of the refrigerant in the filling process of the cold water unit, so that the filling amount of the refrigerant reaches a proper level, simplifies the matching process of the filling amount of the refrigerant of the cold water unit, reduces the matching difficulty of the filling amount of the refrigerant of the cold water unit, reduces the dependence on professionals and reduces the overall maintenance cost of the cold water unit.
Description
Technical Field
The invention relates to the technical field of units, in particular to a method and a device for automatically controlling the refrigerant filling amount of a water chilling unit and the water chilling unit.
Background
During the use of the water chilling unit, the condition of refrigerant loss is inevitable, for example, the refrigerant leaks or is disassembled and repaired, and the following consequences can be caused due to the insufficient refrigerant:
(1) under the maximum load of the compressor, the unit has low evaporation pressure, low refrigerating output and poor energy efficiency;
(2) the compressor is unloaded and operated, the full load output cannot be realized, and the refrigerating output is low;
(3) the unit has too low evaporation pressure protection and cannot run.
In order to enable the unit to normally operate, the unit needs to be supplemented with refrigerant after maintenance or overhaul of the unit is finished. In the case of a unit with a certain amount of refrigerant, in order to ensure the proper refrigerant filling amount, there are generally two methods:
(1) the residual refrigerant in the unit is completely discharged or recycled firstly, and then the refrigerant is poured according to the filling amount of the refrigerant marked by the nameplate, so that the time is wasted, and the cost is higher;
(2) the refrigerant is matched and filled according to the running condition of the unit after the unit is started on site by professional personnel, but the requirement on the technical level of the operating personnel is higher.
Aiming at the problems of high cost of replenishing the refrigerant and high requirement on the level of operators in the prior art, no effective solution is provided at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling automatic matching of refrigerant filling amount of a water chilling unit and the water chilling unit, and aims to solve the problems that in the prior art, the cost of supplementing refrigerants is high and the requirement on the level of operators is high.
In order to solve the technical problem, an embodiment of the present invention provides an automatic matching control method for refrigerant filling amount of a water chiller, including: acquiring unit operation parameters; judging whether the unit operation parameters meet preset conditions or not; and controlling the filling amount of the refrigerant according to the judgment result.
Optionally, judging whether the unit operation parameters meet preset conditions, and controlling the filling amount of the refrigerant according to the judgment result, including: starting a compressor and judging whether a low-pressure alarm occurs or not; and if the low-pressure alarm occurs, filling a refrigerant into the evaporator according to a first set filling amount, returning to the step of starting the compressor and judging whether the low-pressure alarm occurs or not after the filling is finished until the compressor is normally started.
Optionally, judging whether the unit operation parameters meet preset conditions, and controlling the filling amount of the refrigerant according to the judgment result, including: if the low-pressure alarm does not occur in the unit and the compressor is normally started, carrying out loading operation on the compressor; judging whether the compressor can be loaded to the maximum load or not; and if the compressor can not be loaded to the maximum load, filling the refrigerant into the evaporator according to a second set filling amount, and returning to the step of judging whether the compressor can be loaded to the maximum load or not after filling is finished until the compressor can be loaded to the maximum load.
Optionally, judging whether the unit operation parameters meet preset conditions, and controlling the filling amount of the refrigerant according to the judgment result, including: if the compressor is loaded to the maximum load, judging whether the temperature difference of the end of the evaporator is less than or equal to a preset threshold value; if not, controlling the filling amount of the refrigerant according to the opening degree of the electronic expansion valve.
Optionally, controlling the filling amount of the refrigerant according to the opening degree of the electronic expansion valve includes: judging whether the opening degree of the electronic expansion valve is maximum or not; if the temperature difference is not the maximum, increasing the opening degree of the electronic expansion valve according to a preset opening degree, and returning to the step of judging whether the temperature difference at the end of the evaporator is less than or equal to a preset threshold value; and if the temperature difference is maximum, filling the refrigerant into the evaporator according to a third set filling amount, and returning to the step of judging whether the end temperature difference of the evaporator is less than or equal to a preset threshold value after filling is finished until the end temperature difference is less than or equal to the preset threshold value.
Optionally, before determining whether the end temperature difference of the evaporator is less than or equal to a preset threshold, the method further includes: detecting the temperature of the outlet water of the chilled water, and calculating the evaporation temperature of the refrigerant; and calculating the difference value between the outlet water temperature of the chilled water and the evaporation temperature as the end temperature difference.
Optionally, charging the evaporator with a refrigerant, comprising: the opening duration of the electromagnetic valve is controlled to control the filling amount of the refrigerant filled into the evaporator, wherein the electromagnetic valve is positioned on a filling pipeline between the refrigerant storage tank and the evaporator, and the opening duration is matched with the set filling amount.
The embodiment of the invention also provides an automatic matching control device for the refrigerant filling amount of the water chilling unit, which comprises the following components: the acquisition module is used for acquiring unit operation parameters; and the control module is used for judging whether the unit operation parameters meet preset conditions or not and controlling the filling amount of the refrigerant according to the judgment result.
An embodiment of the present invention further provides a water chilling unit, including: the invention discloses an automatic matching control device for the refrigerant filling amount of a water chilling unit.
Optionally, the water chilling unit is externally connected with a refrigerant storage tank, the refrigerant storage tank is connected to an evaporator of the water chilling unit through a filling pipeline, an electromagnetic valve is installed on the filling pipeline, and the filling amount of the refrigerant from the refrigerant storage tank to the evaporator is controlled by opening and closing the electromagnetic valve.
Optionally, the water chilling unit further includes: the chilled water outlet temperature sensor is arranged at a chilled water outlet of the evaporator and used for detecting the outlet water temperature of the chilled water; and the evaporation pressure sensor is arranged on the evaporator and used for detecting the evaporation pressure.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for controlling automatic matching of the refrigerant filling amount of a chiller according to any embodiment of the present invention.
By applying the technical scheme of the invention, the unit operation parameters are obtained, whether the unit operation parameters meet the corresponding preset conditions or not is judged, the filling amount of the refrigerant is automatically matched and controlled according to the judgment result, the automatic adjustment and matching of the filling amount in the refrigerant filling process of the water chiller unit are realized, the filling amount of the refrigerant reaches a proper level, the matching process of the refrigerant filling amount of the water chiller unit is simplified, the matching difficulty of the refrigerant filling amount of the water chiller unit is reduced, the dependence on professionals is reduced, and the overall maintenance cost of the water chiller unit is reduced.
Drawings
Fig. 1 is a flowchart of a method for controlling automatic matching of refrigerant filling amount of a water chiller according to an embodiment of the present invention;
fig. 2 is a block diagram of a configuration of an automatic matching control device for refrigerant filling amount of a water chilling unit according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a water chilling unit according to a third embodiment of the present invention;
fig. 4 is a specific flowchart of a method for controlling automatic matching of refrigerant filling amount of a water chiller according to a fourth embodiment of the present invention;
in fig. 3, 10 is an evaporator, 11 is chilled water inlet, 12 is chilled water outlet, 13 is a chilled water outlet temperature sensor, 14 is an evaporation pressure sensor, 20 is a compressor, 30 is a condenser, 31 is chilled water inlet, 32 is chilled water outlet, 40 is an electronic expansion valve, 50 is a refrigerant storage tank, and 60 is a solenoid valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a flowchart of a method for controlling automatic matching of refrigerant filling amount of a water chiller according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
and S101, acquiring unit operation parameters.
And S102, judging whether the unit operation parameters meet preset conditions.
And S103, controlling the filling amount of the refrigerant according to the judgment result.
The unit operating parameters may include: evaporating pressure, compressor loading condition, end temperature difference and opening degree of the electronic expansion valve. The preset conditions correspond to the operation parameters of each unit, each parameter corresponds to a respective preset condition, for example, the preset condition corresponding to the evaporation pressure is whether low-pressure protection is triggered, the preset condition corresponding to the loading condition of the compressor is whether the compressor can be loaded to the maximum load, the preset condition corresponding to the end temperature difference is whether the end temperature difference is less than or equal to a preset threshold value, and the preset condition corresponding to the opening of the electronic expansion valve is whether the opening of the electronic expansion valve is opened to the maximum.
According to the technical scheme, the unit operation parameters are acquired, whether the unit operation parameters meet corresponding preset conditions or not is judged, the filling amount of the refrigerant is automatically matched and controlled according to the judgment result, automatic adjustment and matching of the filling amount in the filling process of the refrigerant of the water chiller are achieved, the filling amount of the refrigerant reaches a proper level, the matching process of the filling amount of the refrigerant of the water chiller is simplified, the matching difficulty of the filling amount of the refrigerant of the water chiller is reduced, dependence on professionals is reduced, and the overall maintenance cost of the water chiller is reduced.
Optionally, judging whether the unit operation parameters meet preset conditions, and controlling the filling amount of the refrigerant according to the judgment result, including: starting a compressor and judging whether a low-pressure alarm occurs or not; and if the low-pressure alarm occurs, filling a refrigerant into the evaporator according to a first set filling amount, returning to the step of starting the compressor and judging whether the low-pressure alarm occurs or not after the filling is finished until the compressor is normally started. The first set perfusion volume may be set on a case-by-case basis.
The content of the refrigerant in the unit is too low, so that the low pressure (namely the evaporation pressure) of the system is too low, low-pressure alarm and protection are triggered, the compressor cannot be normally started, and the refrigerant is filled into the evaporator according to a first set filling amount until the compressor can be normally started. The refrigerant filling amount is automatically matched based on the low-pressure alarm of the system, the refrigerant filling amount reaches a proper level through a simple process, and the compressor can be normally started by the refrigerant content.
Optionally, judging whether the unit operation parameters meet preset conditions, and controlling the filling amount of the refrigerant according to the judgment result, including: if the low-pressure alarm does not occur in the unit and the compressor is normally started, carrying out loading operation on the compressor; judging whether the compressor can be loaded to the maximum load or not; and if the compressor can not be loaded to the maximum load, filling the refrigerant into the evaporator according to a second set filling amount, and returning to the step of judging whether the compressor can be loaded to the maximum load or not after filling is finished until the compressor can be loaded to the maximum load. The second set perfusion volume may be set as the case may be.
The low pressure of the system, namely the evaporation pressure, can be detected by a pressure sensor. If the low pressure of the system is too low, the compressor cannot be loaded to the maximum load, and the refrigerant is filled into the evaporator according to the second set filling amount until the compressor can be loaded to the maximum load. The refrigerant filling amount is automatically matched based on the loading condition of the compressor, the refrigerant filling amount reaches a proper level through a simple flow, and the normal work of the compressor can be ensured due to the refrigerant content.
Optionally, judging whether the unit operation parameters meet preset conditions, and controlling the filling amount of the refrigerant according to the judgment result, including: if the compressor is loaded to the maximum load, judging whether the temperature difference of the end of the evaporator is less than or equal to a preset threshold value; if not, controlling the filling amount of the refrigerant according to the opening degree of the electronic expansion valve.
Specifically, before judging whether the end temperature difference of the evaporator is less than or equal to a preset threshold, the method further includes: detecting the temperature of the outlet water of the chilled water, and calculating the evaporation temperature of the refrigerant; and calculating the difference value between the outlet water temperature of the chilled water and the evaporation temperature as the end temperature difference.
Wherein, the outlet water temperature of the chilled water can be detected by a temperature sensor. The evaporation temperature of the refrigerant can be calculated from the refrigerant characteristics. The preset threshold value can be determined according to parameters such as evaporator form, evaporation temperature, condensation temperature and the like, and can be set as a fixed value or a fitting function related to parameters such as pressure and the like.
If the temperature difference at the end of the evaporator is less than or equal to a preset threshold value, the temperature regulation requirement is met, and an automatic matching control flow of refrigerant filling amount is withdrawn; if the temperature difference at the end of the evaporator is greater than the preset threshold value, it needs to be further determined whether the temperature difference is caused by insufficient refrigerant content, and the filling amount of the refrigerant can be controlled according to the opening degree of the electronic expansion valve in one embodiment.
Further, the method for controlling the filling amount of the refrigerant according to the opening degree of the electronic expansion valve comprises the following steps: judging whether the opening degree of the electronic expansion valve is maximum or not; if the temperature difference is not the maximum, increasing the opening degree of the electronic expansion valve according to a preset opening degree, and returning to the step of judging whether the temperature difference at the end of the evaporator is less than or equal to a preset threshold value; and if the temperature difference is maximum, filling the refrigerant into the evaporator according to a third set filling amount, and returning to the step of judging whether the end temperature difference of the evaporator is less than or equal to a preset threshold value after filling is finished until the end temperature difference is less than or equal to the preset threshold value.
And if the opening degree of the electronic expansion valve is not opened to the maximum, increasing the opening degree of the electronic expansion valve to reduce the outlet water temperature of the chilled water and further reduce the end temperature difference. The preset opening degree can be set according to the actual situation. And if the end temperature difference is less than or equal to the preset threshold before the opening of the electronic expansion valve is opened to the maximum, the automatic matching control process of the refrigerant perfusion amount is exited. And if the opening of the electronic expansion valve is opened to the maximum, and the temperature difference at the end is still larger than a preset threshold value, the refrigerant needs to be filled. The third set perfusion amount may be set on a case-by-case basis.
This embodiment is based on end difference in temperature and electronic expansion valve aperture, and the refrigerant perfusion volume is filled in the automatic matching, makes the refrigerant perfusion volume reach a comparatively suitable level through simple flow, guarantees that the unit operation can reach the demand that adjusts the temperature.
In practical application, a refrigerant storage tank (filled with refrigerant) is used for filling refrigerant into the evaporator, and the refrigerant storage tank is connected with the evaporator through a filling pipeline. On the premise of a certain pouring speed, the pouring amount can be controlled by controlling the pouring time, so that the automatic and accurate control of the pouring amount is realized. In one embodiment, charging the evaporator with refrigerant may include: the opening duration of the electromagnetic valve is controlled to control the filling amount of the refrigerant filled into the evaporator, wherein the electromagnetic valve is positioned on a filling pipeline between the refrigerant storage tank and the evaporator, and the opening duration is matched with the set filling amount.
Specifically, the filling of the refrigerant into the evaporator according to the first set filling amount includes: and controlling the electromagnetic valve to be continuously electrified and opened for a first preset time, and opening the electromagnetic valve for the first preset time to fill the refrigerant with the first set filling amount into the evaporator.
Filling the evaporator with the refrigerant at the second set filling amount includes: and controlling the electromagnetic valve to be continuously electrified and opened for a second preset time, and opening the electromagnetic valve for the second preset time to fill the refrigerant with a second set filling amount into the evaporator.
Filling the evaporator with the refrigerant at the third set filling amount includes: and controlling the electromagnetic valve to be continuously electrified and opened for a third preset time, and opening the electromagnetic valve for the third preset time to fill the refrigerant with a third set filling amount into the evaporator.
Example two
Based on the same inventive concept, the embodiment provides an automatic matching control device for the refrigerant filling amount of a water chilling unit, which can be used for realizing the automatic matching control method for the refrigerant filling amount of the water chilling unit in the embodiment. The device can be implemented by software and/or hardware, and the device can be generally integrated in a water chilling unit.
Fig. 2 is a block diagram of a configuration of an automatic matching control device for refrigerant filling amount of a chiller according to a second embodiment of the present invention, and as shown in fig. 2, the device includes:
the acquisition module 21 is used for acquiring unit operation parameters;
and the control module 22 is used for judging whether the unit operation parameters meet preset conditions or not and controlling the filling amount of the refrigerant according to the judgment result.
Optionally, the control module 22 includes:
the first judgment unit is used for starting the compressor and judging whether low-pressure alarm occurs or not;
and the first control unit is used for filling the refrigerant into the evaporator according to a first set filling amount if low-pressure alarm occurs, returning to the step of starting the compressor and judging whether low-pressure alarm occurs or not after filling is finished until the compressor is normally started.
Optionally, the control module 22 includes:
the loading unit is used for loading the compressor if the low-pressure alarm does not occur in the unit and the compressor is normally started;
a second judging unit for judging whether the compressor can be loaded to a maximum load;
and the second control unit is used for filling the refrigerant into the evaporator according to a second set filling amount if the compressor cannot be loaded to the maximum load, and returning to the step of judging whether the compressor can be loaded to the maximum load or not after filling is finished until the compressor can be loaded to the maximum load.
Optionally, the control module 22 includes:
the third judging unit is used for judging whether the temperature difference of the end of the evaporator is less than or equal to a preset threshold value or not if the compressor is loaded to the maximum load;
and the third control unit is used for controlling the filling amount of the refrigerant according to the opening degree of the electronic expansion valve if the electronic expansion valve is not opened.
Optionally, the third control unit is specifically configured to:
judging whether the opening degree of the electronic expansion valve is maximum or not;
if the temperature difference is not the maximum, increasing the opening degree of the electronic expansion valve according to a preset opening degree, and returning to the step of judging whether the temperature difference at the end of the evaporator is less than or equal to a preset threshold value;
and if the temperature difference is maximum, filling the refrigerant into the evaporator according to a third set filling amount, and returning to the step of judging whether the end temperature difference of the evaporator is less than or equal to a preset threshold value after filling is finished until the end temperature difference is less than or equal to the preset threshold value.
Optionally, the control module 22 further includes: the calculating unit is used for detecting the temperature of the outlet water of the chilled water and calculating the evaporation temperature of the refrigerant before the third judging unit judges whether the temperature difference of the ends of the evaporator is less than or equal to the preset threshold value; and calculating the difference value between the outlet water temperature of the chilled water and the evaporation temperature as the end temperature difference.
Optionally, the first control unit, the second control unit, and the third control unit are specifically configured to: the opening duration of the electromagnetic valve is controlled to control the filling amount of the refrigerant filled into the evaporator, wherein the electromagnetic valve is positioned on a filling pipeline between the refrigerant storage tank and the evaporator, and the opening duration is matched with the set filling amount.
The device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
EXAMPLE III
The embodiment provides a water chilling unit, which comprises the automatic matching control device for the refrigerant filling amount of the water chilling unit.
Referring to fig. 3, when the chiller is matched with the refrigerant filling amount, the chiller needs to be externally connected with a refrigerant storage tank 50, the refrigerant storage tank 50 is connected to the evaporator 10 of the chiller through a filling line, an electromagnetic valve 60 is installed on the filling line, the filling amount of the refrigerant from the refrigerant storage tank 50 to the evaporator 10 is controlled by opening and closing the electromagnetic valve 60, and the refrigerant in the tank is supplemented into the chiller.
The water chilling unit further comprises: chilled water goes out water temperature sensor 13, installs in the chilled water exit of evaporimeter 10 for detect chilled water leaving water temperature, and then can calculate the end difference in temperature according to chilled water leaving water temperature, as unit operating parameter with automatic matching control refrigerant volume of filling.
The water chilling unit further comprises: and the evaporation pressure sensor 14 is arranged on the evaporator 10 and used for detecting the evaporation pressure, further taking the evaporation pressure as a unit operation parameter, judging whether to trigger a system low-pressure alarm or not, and further automatically matching and controlling the refrigerant filling amount.
The present embodiment also provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the method for controlling automatic matching of the refrigerant filling amount of a chiller according to any embodiment of the present invention.
Example four
The embodiment describes the automatic matching control scheme of the refrigerant filling amount of the water chiller according to a specific example, and the method is implemented based on the structural diagram shown in fig. 3. It should be noted, however, that the specific examples are only for better illustration of the present application and should not be construed as unduly limiting the present application. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
Referring to fig. 4, the unit is started, the compressor is started, if the low pressure (i.e. the evaporation pressure) of the system is too low due to too low content of refrigerant in the unit, and the compressor cannot be started normally, the solenoid valve is continuously electrified and opened for T1 seconds, and the starting operation of the compressor is performed in the next action period (i.e. after the time of T1 seconds is reached) until the compressor can be started normally.
If the compressor cannot be loaded to the maximum load due to low system pressure, the electromagnetic valve is continuously electrified and opened for T2 seconds, and whether the electromagnetic valve needs to be continuously electrified or not is judged according to whether the compressor is loaded to the maximum load or not in the next action period (namely after the time of T2 seconds is up) until the compressor can be loaded to the maximum load.
After the compressor is loaded to the maximum load, the outlet water temperature of the chilled water is detected, the evaporation temperature of the refrigerant can be calculated according to the characteristics of the refrigerant, and if the temperature difference delta T at the end is less than or equal to T, the automatic matching control process is exited.
If the end temperature difference delta T is greater than T and the opening of the electronic expansion valve is not opened to the maximum, opening the electronic expansion valve to the maximum, and if the end temperature difference delta T is not greater than T before the opening of the electronic expansion valve is opened to the maximum, exiting the automatic matching control process.
And if the end temperature difference delta T is greater than T and the opening of the electronic expansion valve is opened to the maximum, continuously electrifying the electromagnetic valve and opening for T3 seconds until the delta T is less than or equal to T, and exiting the automatic matching control process.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A control method for the refrigerant filling amount of a water chilling unit is characterized by comprising the following steps:
acquiring unit operation parameters;
judging whether the unit operation parameters meet preset conditions or not;
controlling the filling amount of the refrigerant according to the judgment result;
wherein, judge whether unit operating parameter accords with the preset condition, according to the perfusion volume of judgement result control refrigerant, include:
if the compressor is loaded to the maximum load, judging whether the temperature difference of the end of the evaporator is less than or equal to a preset threshold value;
if not, controlling the filling amount of the refrigerant according to the opening degree of an electronic expansion valve, wherein the electronic expansion valve is connected between the evaporator and the condenser;
the method for controlling the filling amount of the refrigerant according to the opening degree of the electronic expansion valve comprises the following steps:
judging whether the opening degree of the electronic expansion valve is maximum or not;
if the temperature difference is not the maximum, increasing the opening degree of the electronic expansion valve according to a preset opening degree, and returning to the step of judging whether the temperature difference at the end of the evaporator is less than or equal to a preset threshold value;
and if the temperature difference is maximum, determining that the temperature difference at the end of the evaporator is larger than a preset threshold value due to insufficient refrigerant, filling the refrigerant into the evaporator according to a third set filling amount, and returning to the step of judging whether the temperature difference at the end of the evaporator is smaller than or equal to the preset threshold value after filling is finished until the temperature difference at the end is smaller than or equal to the preset threshold value.
2. The method according to claim 1, wherein judging whether the unit operation parameters meet preset conditions or not and controlling the filling amount of the refrigerant according to the judgment result comprises the following steps:
starting a compressor and judging whether a low-pressure alarm occurs or not;
and if the low-pressure alarm occurs, filling a refrigerant into the evaporator according to a first set filling amount, returning to the step of starting the compressor and judging whether the low-pressure alarm occurs or not after the filling is finished until the compressor is normally started.
3. The method according to claim 1, wherein judging whether the unit operation parameters meet preset conditions or not and controlling the filling amount of the refrigerant according to the judgment result comprises the following steps:
if the low-pressure alarm does not occur in the unit and the compressor is normally started, carrying out loading operation on the compressor;
judging whether the compressor can be loaded to the maximum load or not;
and if the compressor can not be loaded to the maximum load, filling the refrigerant into the evaporator according to a second set filling amount, and returning to the step of judging whether the compressor can be loaded to the maximum load or not after filling is finished until the compressor can be loaded to the maximum load.
4. The method of claim 1, before determining whether the end temperature difference of the evaporator is less than or equal to a preset threshold, further comprising:
detecting the temperature of the outlet water of the chilled water, and calculating the evaporation temperature of the refrigerant;
and calculating the difference value between the outlet water temperature of the chilled water and the evaporation temperature as the end temperature difference.
5. The method of any one of claims 1 to 4, wherein charging the evaporator with refrigerant comprises:
the opening duration of the electromagnetic valve is controlled to control the filling amount of the refrigerant filled into the evaporator, wherein the electromagnetic valve is positioned on a filling pipeline between the refrigerant storage tank and the evaporator, and the opening duration is matched with the set filling amount.
6. A control device for the refrigerant filling amount of a water chilling unit is characterized by comprising:
the acquisition module is used for acquiring unit operation parameters;
the control module is used for judging whether the unit operation parameters meet preset conditions or not and controlling the filling amount of the refrigerant according to the judgment result;
wherein the control module comprises:
the third judging unit is used for judging whether the temperature difference of the end of the evaporator is less than or equal to a preset threshold value or not if the compressor is loaded to the maximum load;
the third control unit is used for controlling the filling amount of the refrigerant according to the opening degree of an electronic expansion valve if the refrigerant is not filled in the evaporator, and the electronic expansion valve is connected between the evaporator and the condenser;
the third control unit is specifically configured to:
judging whether the opening degree of the electronic expansion valve is maximum or not;
if the temperature difference is not the maximum, increasing the opening degree of the electronic expansion valve according to a preset opening degree, and returning to the step of judging whether the temperature difference at the end of the evaporator is less than or equal to a preset threshold value;
and if the temperature difference is maximum, determining that the temperature difference at the end of the evaporator is larger than a preset threshold value due to insufficient refrigerant, filling the refrigerant into the evaporator according to a third set filling amount, and returning to the step of judging whether the temperature difference at the end of the evaporator is smaller than or equal to the preset threshold value after filling is finished until the temperature difference at the end is smaller than or equal to the preset threshold value.
7. A chiller, comprising: the apparatus for controlling the refrigerant filling amount of a water chiller according to claim 6.
8. The water chilling unit according to claim 7, wherein the water chilling unit is externally connected with a refrigerant storage tank, the refrigerant storage tank is connected to an evaporator of the water chilling unit through a filling pipeline, an electromagnetic valve is installed on the filling pipeline, and the filling amount of refrigerant filled into the evaporator from the refrigerant storage tank is controlled by opening and closing the electromagnetic valve.
9. The water chiller according to claim 7 further comprising:
the chilled water outlet temperature sensor is arranged at a chilled water outlet of the evaporator and used for detecting the outlet water temperature of the chilled water;
and the evaporation pressure sensor is arranged on the evaporator and used for detecting the evaporation pressure.
10. A computer-readable storage medium on which a computer program is stored, wherein the program, when executed by a processor, implements the method for controlling the refrigerant filling amount of the chiller according to any one of claims 1 to 5.
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| JP2002350014A (en) * | 2001-05-22 | 2002-12-04 | Daikin Ind Ltd | Refrigerating equipment |
| JP4110276B2 (en) * | 2003-10-03 | 2008-07-02 | 株式会社日立製作所 | Refrigerant filling apparatus and refrigerant filling method |
| JP2005241172A (en) * | 2004-02-27 | 2005-09-08 | Mitsubishi Heavy Ind Ltd | Refrigerant filling method for refrigeration cycle and its device |
| CN203163366U (en) * | 2013-02-05 | 2013-08-28 | 东莞市微电环保科技有限公司 | Air conditioner refrigerant regulation unit |
| CN104534752B (en) * | 2015-01-26 | 2016-08-24 | 珠海格力电器股份有限公司 | Refrigerant filling system and method and air conditioning unit |
| CN104879972A (en) * | 2015-06-03 | 2015-09-02 | 广东美的暖通设备有限公司 | Refrigeration system, and method and device for automatically filling refrigeration system with refrigerants |
| CN105004116B (en) * | 2015-07-09 | 2017-10-24 | 广东美的暖通设备有限公司 | The coolant injection control method of air-conditioner outdoor unit, air-conditioning |
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