CN115823786A - Unit anti-freezing control method and device and water chilling unit - Google Patents
Unit anti-freezing control method and device and water chilling unit Download PDFInfo
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- CN115823786A CN115823786A CN202211573099.5A CN202211573099A CN115823786A CN 115823786 A CN115823786 A CN 115823786A CN 202211573099 A CN202211573099 A CN 202211573099A CN 115823786 A CN115823786 A CN 115823786A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 238000007710 freezing Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000008859 change Effects 0.000 claims abstract description 25
- 238000012790 confirmation Methods 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 11
- 238000005057 refrigeration Methods 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 4
- 230000002528 anti-freeze Effects 0.000 claims description 4
- 230000008014 freezing Effects 0.000 abstract description 11
- 238000005336 cracking Methods 0.000 abstract description 6
- 239000003507 refrigerant Substances 0.000 description 20
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000012423 maintenance Methods 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
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- 230000001360 synchronised effect Effects 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention discloses a unit anti-freezing control method and device and a water chilling unit. Wherein, the method comprises the following steps: responding to a low-pressure protection instruction, and acquiring an air suction temperature and an air suction temperature change value before the low-pressure protection occurrence moment; and if the air suction temperature is less than or equal to a first preset threshold value and the air suction temperature variation value is less than or equal to a second preset threshold value, executing anti-freezing control. According to the invention, by sensing the low-pressure, the air suction temperature and the air suction temperature change, the water flow state in the water outlet side heat exchanger can be timely and accurately judged, and an anti-freezing control measure is timely taken under the condition that the water shortage of the water chilling unit is judged, so that the water chilling unit is prevented from running in a water-free state, the risk of freezing the water side heat exchanger is reduced, the anti-freezing reliability of the water chilling unit is improved, the anti-freezing is more independent and effective, and the problem of frost cracking of the shell and tube caused by the running of the water chilling unit in the water-free state is solved.
Description
Technical Field
The invention relates to the technical field of units, in particular to a unit anti-freezing control method and device and a water chilling unit.
Background
The secondary refrigerant of the conventional water chilling unit generally adopts water, so that the condition that the shell and tube are frozen due to freezing of water to cause the failure of the whole machine easily occurs in the refrigeration process, the phenomenon can be caused due to the reasons of insufficient water flow, water path blockage or water pump failure and the like, the shell and tube failure causes the water inlet of the system, and then most accessories of the host system are damaged.
In order to solve the problems, the most widely applied mode at present is a mode of arranging a temperature controller or a flow switch, and when the temperature of the outlet water of the cold water is lower than 3 ℃ or the flow of the cold water is lower than a protection value, the protection switch acts to stop the running of the water chilling unit.
However, in actual conditions, engineering maintenance personnel neglect to cause that the water pump is not started before the host is started, or a water system is dirty and blocked, or a related valve is not started, and the reasons may cause no water flow operation, and the flow switch may also fail, and the outlet water temperature sensing bulb is placed at the outlet of the shell pipe, so that the sensing of the internal temperature of the shell pipe has hysteresis, and the protection mechanism fails or is not in time. Under the above-mentioned condition, if the unit continues the start-up operation, lead to the shell and tube frost crack easily.
Aiming at the problem that the unit operates in a water flow-free state to cause frost cracking of a shell and tube in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a unit anti-freezing control method and device and a water chilling unit, and at least solves the problem that a shell and tube is frost-cracked due to the operation of the unit in a water flow-free state in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a unit anti-freezing control method, including:
responding to a low-pressure protection instruction, and acquiring an air suction temperature and an air suction temperature change value before the low-pressure protection occurrence moment;
and if the air suction temperature is less than or equal to a first preset threshold value and the air suction temperature variation value is less than or equal to a second preset threshold value, executing anti-freezing control.
Optionally, the antifreeze control is executed, including:
closing the throttling element and the compressor;
and outputting a reminding message to remind a user to check whether the water flow of the water pump and the water system is normal.
Optionally, closing the throttling element and the compressor, comprising: immediately closing the throttling element, and closing the compressor after a first preset time.
Optionally, after the reminding message is output, the method further includes: and after the second preset time, activating a confirmation function, and when a confirmation instruction is received, continuing starting up the unit for running.
Optionally, obtaining the suction temperature and the suction temperature variation value before the occurrence of the under-pressure protection includes:
acquiring the air suction temperature of each moment in a third preset time before the occurrence moment of low-pressure protection, and calculating the average value of the air suction temperature of each moment to be used as the air suction temperature before the occurrence moment of low-pressure protection;
the method comprises the steps of obtaining the air suction temperature of each moment in a fourth preset time before the occurrence moment of low-pressure protection, calculating the difference value between the air suction temperature of any moment in the fourth preset time and the air suction temperature of the previous moment to obtain at least one difference value, and then calculating the average value of the at least one difference value to serve as the air suction temperature change value before the occurrence moment of the low-pressure protection.
Optionally, before responding to the low voltage protection command, the method further comprises: responding to a starting refrigeration instruction, and starting a compressor; detecting the low-pressure under the condition that the starting time of the compressor is less than or equal to a fifth preset time; and outputting the low-pressure protection instruction when the low-pressure is detected to be smaller than the preset pressure.
The embodiment of the invention also provides a unit anti-freezing control device, which comprises:
the acquisition module is used for responding to the low-pressure protection instruction and acquiring the air suction temperature and the air suction temperature change value before the low-pressure protection occurrence moment;
and the control module is used for executing anti-freezing control if the suction temperature is less than or equal to a first preset threshold and the suction temperature variation value is less than or equal to a second preset threshold.
An embodiment of the present invention further provides a water chilling unit, including: the unit anti-freezing control device provided by the embodiment of the invention.
An embodiment of the present invention further provides a computer device, including: the device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method of the embodiment of the invention.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method according to the embodiments of the present invention.
By applying the technical scheme of the invention, the water flow state in the water outlet side heat exchanger can be accurately judged in time by sensing the low-pressure, the air suction temperature and the air suction temperature change, and the anti-freezing control measures are taken in time under the condition that the water shortage of the water chilling unit is judged, so that the water chilling unit is prevented from running in a water-free state, the risk of freezing the water side heat exchanger is reduced, the anti-freezing reliability of the water chilling unit is improved, the anti-freezing is more independent and effective, and the problem of frost cracking of a shell tube caused by the running of the water chilling unit in the water-free state is solved.
Drawings
FIG. 1 is a flow chart of a unit anti-freezing control method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a water chilling unit according to a second embodiment of the present invention;
FIG. 3 is a flow chart of the unit anti-freezing control provided by the second embodiment of the present invention;
fig. 4 is a block diagram of a unit anti-freezing control device provided in the third embodiment of the present invention.
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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example one
The embodiment provides a unit anti-freezing control method, which can be applied to a water chilling unit, and fig. 1 is a flowchart of a unit anti-freezing control method provided in an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
and S101, responding to the low-pressure protection instruction, and acquiring the air suction temperature and the air suction temperature change value before the low-pressure protection occurrence moment.
S102, if the air suction temperature is smaller than or equal to a first preset threshold value and the air suction temperature change value is smaller than or equal to a second preset threshold value, executing anti-freezing control.
The first preset threshold and the second preset threshold are thresholds representing that the unit is in a water shortage state, and can be preset according to the actual condition of the unit.
The first predetermined threshold may be a value in the range of-20 ℃ to 50 ℃.
The water of cooling water set water system constantly flows under the effect of water pump, and during the refrigeration, the refrigerant evaporates into refrigerant gas at the heat of the water side heat exchanger shell intraductal absorption water of water side, and this in-process normal water can cool down, and refrigerant and water have the difference in temperature of relative temperature could form this kind of heat transfer, and this kind of difference in temperature is relatively stable under the normal condition that supplies water of water system. When the water system is abnormal (such as abnormal closing of a water pump, blockage of the water system, abnormal closing of a valve and the like), water in the water system does not flow any more, a small amount of residual water is contained in the shell and tube and is in a standing state, the small amount of water is cooled continuously, and the refrigerant pressure is low due to too little water and too low temperature, so that the low-pressure protection value state is reached, and low-pressure protection is shown. The synchronous suction temperature also drops, when the suction temperature approaches the freezing point (0 ℃), it can be determined that there is a risk of icing inside the shell and tube, and the less the residual water, the more violent the suction temperature drop.
When the unit takes place the low pressure protection, probably lack the refrigerant and lead to, also probably lack water and lead to, combine to breathe in temperature and variation tendency and can in time accurately judge whether because the unit lacks water and leads to low pressure protection, the unit lacks water and can lead to the water side heat exchanger to have the risk of freezing, consequently this embodiment combines low pressure, temperature of breathing in and the temperature variation condition of breathing in to carry out frostproofing control. The air suction temperature can reflect the temperature of a refrigerant in the water side heat exchanger, the temperature of cold water outlet water is not required to be detected, hysteresis does not exist, no matter no water exists before the unit is started or water is suddenly cut off in the starting process or no water exists in the running process, anti-freezing control can be carried out more timely based on the air suction temperature and the change condition of the air suction temperature, and the anti-freezing prejudgment performance is improved.
The embodiment can timely and accurately judge the water flow state in the water side heat exchanger by sensing the low-pressure, the air suction temperature and the air suction temperature change, and timely take anti-freezing control measures under the condition that the water shortage of the water chilling unit is judged, so that the water chilling unit is prevented from running under the water-free state, the risk of freezing the water side heat exchanger is reduced, the anti-freezing reliability of the water chilling unit is improved, the anti-freezing is more independent and effective, and the problem of frost cracking of a shell pipe caused by the running of the water chilling unit under the water-free state is solved.
In one embodiment, an antifreeze control is performed, comprising: closing the throttling element and the compressor; and outputting a reminding message to remind a user to check whether the water flow of the water pump and the water system is normal.
The throttling element is a device located between the air-cooled heat exchanger and the water-side heat exchanger, and may be an electronic expansion valve, for example. The reminding message can be output in at least one of the following ways: display screen display, voice playing and light.
According to the embodiment, the throttling element and the compressor are closed, so that the effect of aggravating frost crack caused by the fact that the refrigerant continuously absorbs heat in the shell and tube of the water-side heat exchanger can be prevented; through the reminding message, a protection mechanism can be initiated in the running process, a user is reminded to check the water system to perform response operation, and hidden dangers are timely eliminated.
Further, closing the throttling element and the compressor includes: immediately closing the throttling element and after a first preset time, closing the compressor. The first preset time can be set according to the actual situation of the unit, for example, the first preset time is set to be 3 seconds.
In the embodiment, when the shell pipe of the water side heat exchanger is lack of water, if the refrigerant is continuously reserved in the shell pipe, the freezing speed is accelerated, so that the throttling element is immediately closed to prevent the refrigerant from further flowing to the shell pipe; the compressor is closed after the throttling element is closed for the first preset time, so that the refrigerant can be pumped away from the shell pipe, and the freezing speed is delayed.
Further, after the reminding message is output, the method further comprises the following steps: and after the second preset time, activating a confirmation function, and when a confirmation instruction is received, continuing starting up the unit for running.
The second preset time can be set according to the actual situation of the unit, for example, the second preset time is set to be 5 minutes. The activation confirmation function may be: adding a display 'confirmation' button on the display screen; alternatively, a confirmation button on the hardware is activated, allowing the user to press; alternatively, voice confirmation is activated, allowing subsequent actions to be performed in accordance with the "confirmation instruction" input by the user's voice.
According to the embodiment, through the confirmation function after the second preset time, enough time is provided for a user to check whether the unit is short of water, and the user is required to really check the water system, which is equivalent to limiting the next starting time, so that the risk of freezing in the shell pipe is reduced.
In one embodiment, obtaining the suction temperature and the suction temperature variation value before the occurrence time of the under-pressure protection comprises:
acquiring the air suction temperature of each moment in a third preset time before the occurrence moment of the low-pressure protection, and calculating the average value of the air suction temperature of each moment to be used as the air suction temperature before the occurrence moment of the low-pressure protection;
the method comprises the steps of obtaining the air suction temperature of each moment in a fourth preset time before the occurrence moment of low-voltage protection, calculating the difference value between the air suction temperature of any moment in the fourth preset time and the air suction temperature of the previous moment to obtain at least one difference value, and then calculating the average value of the at least one difference value to serve as the air suction temperature change value before the occurrence moment of the low-voltage protection.
The third preset time and the fourth preset time can be set according to the actual situation of the unit, the third preset time and the fourth preset time can be equal or unequal, and preferably, the fourth preset time is longer than the third preset time. The fourth preset time is used for confirming whether the change condition of the suction temperature in a certain time accords with a certain rule, and the larger the value in a certain range, the more the water temperature can be reduced at a certain rate in the time. The third preset time is used for confirming whether the average air suction temperature in a certain time is lower than a target value or not, and reflecting the air suction temperature value before the low-pressure protection occurs more accurately. The intake air temperature at each time is preferably acquired at regular time intervals, and for example, the time interval may be 60 seconds, the intake air temperature is acquired once at the current time, and the intake air temperature is acquired once after 60 seconds (referred to as the intake air temperature at the next time). The fourth preset time comprises at least one time interval.
According to the embodiment, the average value in a certain time is calculated, so that the suction temperature and the suction temperature change condition before the low-voltage protection moment can be reflected more accurately, whether the unit is lack of water or not can be judged more accurately, and anti-freezing control can be performed more timely and accurately.
The anti-freezing judgment and control can be carried out in the whole process of the starting and running of the unit, so that anti-freezing control measures can be taken in time no matter the unit is started or runs. For example, before responding to the low-voltage protection command, the method further comprises the following steps: responding to a starting refrigeration instruction, and starting a compressor; detecting the low-pressure under the condition that the starting time of the compressor is less than or equal to a fifth preset time; and outputting a low-pressure protection instruction when the low-pressure is detected to be smaller than the preset pressure. And the fifth preset time can be set according to the actual condition of the unit. The preset pressure can be set according to the actual condition of the unit. The water side heat exchanger can start to be judged when the unit is started for refrigeration, so that anti-freezing protection can be performed at the first time, and the problem that the water side heat exchanger is frozen due to no water before the unit is started is solved.
Example two
The above-mentioned anti-freezing control method of the unit is described below with reference to a specific embodiment, however, it should be noted that this specific embodiment is only for better describing the present application and should not be construed as a limitation to the present application. The same or corresponding terms as those in the above embodiments are explained, and the description thereof is omitted.
As shown in fig. 2, which is a schematic diagram of a water chiller, the water chiller includes: the system comprises a compressor 1, an air-cooled heat exchanger 2, an electronic expansion valve 3 and a water-side heat exchanger 4. The water side heat exchanger 4 comprises a cold water inlet A and a cold water outlet B. The air suction side of the compressor 1 is provided with a pressure sensor 5 and an air suction bulb 6, the pressure sensor 5 is used for detecting air suction pressure (i.e. low pressure), and the air suction bulb 6 is used for detecting air suction temperature. The refrigerant flow direction in the refrigeration mode is as follows: compressor 1 → air-cooled heat exchanger 2 → electronic expansion valve 3 → water-side heat exchanger 4 → compressor 1.
The unit anti-freezing control mechanism is as follows:
in the cooling mode, the following conditions are simultaneously satisfied:
(1) Detecting that the low-pressure Pd is less than P1, and reporting low-pressure protection;
(2) The average value delta T1 of the temperature change values of the suction temperature in T1 time before the occurrence time of the low-voltage protection is less than or equal to delta T2;
(3) The average value Tp of the suction temperature in t2 time before the occurrence time of the low-voltage protection is less than or equal To;
the following freeze prevention control is performed: closing the electronic expansion valve of the system immediately, closing the compressor 1 after 3 seconds, popping up 'please check whether the water pump is started and whether the water flow of the water system is normal' in the control screen, adding a 'confirmation' button in the control screen after 5 minutes, and manually clicking the confirmation button to continue starting the machine.
Wherein P1 corresponds To the predetermined pressure, to corresponds To the first predetermined threshold, and Δ T2 corresponds To the second predetermined threshold. t1 corresponds to the fourth preset time, and t2 corresponds to the third preset time.
Under the condition that the shell and tube is not water, if the refrigerant is continuously reserved in the shell and tube, the freezing speed is increased, and the electronic expansion valve is closed to prevent the refrigerant from flowing to the shell and tube further. The compressor is closed after the electronic expansion valve is closed for 3 seconds, so that the refrigerant can be pumped away from the shell pipe, and the freezing speed is delayed. The compressor 1 is closed after the electronic expansion valve of the system is immediately closed for 3 seconds, so that the phenomenon that the refrigerant absorbs heat continuously in the shell and tube to cause severe frost cracking can be further prevented.
By adding a confirmation button in the control screen after 5 minutes, after manually clicking the confirmation button, the system can be started to operate continuously, a client can be required to really detect the water system, and the next starting time is limited.
The parameter descriptions are shown in the following table 1:
table 1 parameter setting table
The inspiration temperature T may be acquired at regular time intervals and calculated as an inspiration temperature variation Δ T = inspiration temperature at the current time — inspiration temperature at the previous time, e.g. 60 seconds, and the inspiration temperature variation Δ T is the difference between the inspiration temperature at the current time and the inspiration temperature at the time before 60 seconds. the time T1 includes at least one time interval, namely, at least one inspiration temperature change value exists in the time T1, and the average value DeltaT 1 of the inspiration temperature change values in the time T1 is calculated. And calculating the average value of the suction temperatures in the time t2 to obtain the suction temperature average value Tp.
As shown in fig. 3, the unit anti-freezing control comprises the following steps:
s301, the compressor is started.
S302, judging whether the starting time t of the compressor is less than or equal to t0, if so, entering S303, and if not, entering S309. t0 corresponds to the fifth preset time.
S303, judging whether the following conditions are met simultaneously:
(1) Detecting that the low-pressure Pd is less than P1, and reporting low-pressure protection;
(2) The average value delta T1 of the temperature change values of the suction temperature in T1 time before the occurrence time of the low-voltage protection is less than or equal to delta T2;
(3) The average value Tp of the suction temperature in t2 time before the occurrence time of the low-voltage protection is less than or equal To;
if yes, the process proceeds to S304, otherwise, the process returns to S302.
And S304, entering an anti-freezing control mechanism.
S305, closing the electronic expansion valve.
And S306, after 3 seconds, closing the compressor.
S307, the control screen prompts whether the water pump is started or not and whether the water flow of the water system is normal or not.
And S308, adding a confirmation button in the control screen after 5 minutes, manually clicking the confirmation button, continuing starting up and running, and returning to S301.
And S309, continuing to operate the unit. In the process of continuing the operation of the unit, if low-pressure protection occurs, the air suction temperature and the air suction temperature change value can be combined to perform anti-freezing control, so that anti-freezing judgment and control can be realized in the whole process of starting and operating the unit.
In the engineering, the water pump supplies water to the whole water system, and the term "no water flow" refers to that the water pump stops working (the water pump is not started before the machine starts due to a fault or the fact that field engineering personnel know that the water pump is not in place, and the water pump and the machine set are not linked according to specified requirements in the engineering, so that the machine set cannot detect that the water pump is not started before the machine starts), and therefore part of water is remained in the shell and tube of the water-side heat exchanger. This part of water may be more or less, the less the water, the more likely frost cracking occurs, and the less the water, the more severe the drop in water temperature, and therefore whether the drop in suction temperature is severe or not is considered in performing the freeze prevention control. For example, in the same environment, the same cooling capacity is supplied to a cup of water and a barrel of water respectively in a certain time, the cup of water is easier to freeze than the barrel of water, and the temperature sharply changes more rapidly and rapidly.
Water and refrigerant exchange heat in the water side heat exchanger, in the normal operation process, the water temperature can set a target value (for example, 7 ℃), the water absorbs the cold quantity of the refrigerant, the water temperature is reduced, the refrigerant is evaporated, the temperature of the refrigerant at the moment can be lower than the water temperature, and therefore the air suction temperature is considered during anti-freezing control.
Regardless of whether there is more or less water in the water side heat exchanger, there is a common characteristic that low pressure protection will eventually occur because the low water temperature results in a low evaporation pressure (i.e., low pressure), and therefore the low pressure is taken into account when performing freeze protection control. However, the occurrence of low-pressure protection cannot indicate that the low-pressure protection is caused by water shortage, so that the antifreezing control is performed by combining the low-pressure, the air suction temperature and the air suction temperature change value to avoid misjudgment.
EXAMPLE III
Based on the same inventive concept, the embodiment provides a unit anti-freezing control device, which can be used for implementing the unit anti-freezing control method described in the embodiment. The apparatus may be implemented by software and/or hardware.
Fig. 4 is a block diagram of a unit anti-freezing control device provided in a third embodiment of the present invention, and as shown in fig. 4, the device includes:
the obtaining module 41 is configured to obtain an air suction temperature and an air suction temperature change value before an occurrence time of low-pressure protection in response to the low-pressure protection instruction;
and the control module 42 is configured to execute an anti-freezing control if the suction temperature is less than or equal to a first preset threshold and the suction temperature variation value is less than or equal to a second preset threshold.
Optionally, the control module 42 includes:
a closing unit for closing the throttling element and the compressor;
and the output unit is used for outputting a reminding message to remind a user to check whether the water flow of the water pump and the water system is normal or not.
Optionally, the closing unit is specifically configured to: immediately closing the throttling element, and closing the compressor after a first preset time.
Optionally, the control module 42 further includes:
and the control unit is used for activating the confirmation function after the reminding message is output and after a second preset time, and when a confirmation instruction is received, the unit continues to start to operate.
Optionally, the obtaining module 41 is specifically configured to:
acquiring the air suction temperature of each moment in a third preset time before the occurrence moment of low-pressure protection, and calculating the average value of the air suction temperature of each moment to be used as the air suction temperature before the occurrence moment of the low-pressure protection;
the method comprises the steps of obtaining the air suction temperature of each moment in fourth preset time before the occurrence moment of low-pressure protection, calculating the difference value between the air suction temperature of any moment in the fourth preset time and the air suction temperature of the previous moment to obtain at least one difference value, and then calculating the average value of the at least one difference value to serve as the air suction temperature change value before the occurrence moment of the low-pressure protection.
Optionally, the unit anti-freezing control device further includes:
the detection module is used for starting the compressor in a refrigeration mode; detecting the low-pressure under the condition that the starting time of the compressor is less than or equal to a fifth preset time; and outputting the low-pressure protection instruction when the low-pressure is detected to be smaller than the preset pressure.
The device can execute the unit anti-freezing control method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For details of the unit anti-freezing control method provided in the embodiment of the present invention, reference may be made to the technical details not described in detail in the embodiment.
Example four
The embodiment provides a water chilling unit, includes: the unit anti-freezing control device of the embodiment.
EXAMPLE five
The present embodiment provides a computer device, including: the system comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method of the embodiment.
The present embodiment also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the above-described embodiments.
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 position, or may be distributed on multiple 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 unit anti-freezing control method is characterized by comprising the following steps:
responding to a low-pressure protection instruction, and acquiring an air suction temperature and an air suction temperature change value before the low-pressure protection occurrence moment;
and if the air suction temperature is less than or equal to a first preset threshold value and the air suction temperature variation value is less than or equal to a second preset threshold value, executing anti-freezing control.
2. The method of claim 1, wherein performing freeze protection control comprises:
closing the throttling element and the compressor;
and outputting a reminding message to remind a user to check whether the water flow of the water pump and the water system is normal.
3. The method of claim 2, wherein closing the throttling element and the compressor comprises:
immediately closing the throttling element, and closing the compressor after a first preset time.
4. The method of claim 2, further comprising, after outputting the alert message:
and after the second preset time, activating a confirmation function, and when a confirmation instruction is received, continuing starting up the unit for running.
5. The method of claim 1, wherein obtaining the suction temperature and suction temperature change value before the occurrence of under-pressure protection comprises:
acquiring the air suction temperature of each moment in a third preset time before the occurrence moment of low-pressure protection, and calculating the average value of the air suction temperature of each moment to be used as the air suction temperature before the occurrence moment of the low-pressure protection;
the method comprises the steps of obtaining the air suction temperature of each moment in a fourth preset time before the occurrence moment of low-pressure protection, calculating the difference value between the air suction temperature of any moment in the fourth preset time and the air suction temperature of the previous moment to obtain at least one difference value, and then calculating the average value of the at least one difference value to serve as the air suction temperature change value before the occurrence moment of the low-pressure protection.
6. The method of any of claims 1-5, further comprising, prior to responding to an under-voltage protection command:
responding to a starting refrigeration instruction, and starting a compressor;
detecting the low-pressure under the condition that the starting time of the compressor is less than or equal to a fifth preset time;
and outputting the low-pressure protection instruction when the detected low-pressure is smaller than the preset pressure.
7. A unit antifreeze control apparatus, comprising:
the acquisition module is used for responding to the low-voltage protection instruction and acquiring the air suction temperature and the air suction temperature change value before the low-voltage protection occurrence moment;
and the control module is used for executing anti-freezing control if the suction temperature is less than or equal to a first preset threshold and the suction temperature variation value is less than or equal to a second preset threshold.
8. A chiller, comprising: the unit antifreeze control apparatus of claim 7.
9. A computer device, comprising: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 6 when executing the computer program.
10. A non-transitory computer readable storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method of any of claims 1 to 6.
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| CN202211573099.5A CN115823786A (en) | 2022-12-08 | 2022-12-08 | Unit anti-freezing control method and device and water chilling unit |
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| CN202211573099.5A CN115823786A (en) | 2022-12-08 | 2022-12-08 | Unit anti-freezing control method and device and water chilling unit |
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