CN112556222A - Marine air conditioner and seawater flow detection control method and device based on marine air conditioner - Google Patents
Marine air conditioner and seawater flow detection control method and device based on marine air conditioner Download PDFInfo
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- CN112556222A CN112556222A CN202011467818.6A CN202011467818A CN112556222A CN 112556222 A CN112556222 A CN 112556222A CN 202011467818 A CN202011467818 A CN 202011467818A CN 112556222 A CN112556222 A CN 112556222A
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
- F25B2339/047—Water-cooled condensers
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
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Abstract
The application relates to a marine air conditioner and a method and a device for detecting and controlling seawater flow based on the marine air conditioner. The marine air conditioner includes: the system comprises a compressor, a condenser, an evaporator and a throttling device; temperature sensors arranged on a water inlet pipe and a water outlet pipe of the condenser are used for collecting the water inlet temperature and the water outlet temperature of seawater of the marine air conditioning unit, and the seawater is used as a secondary refrigerant of the marine air conditioner; and the air conditioner controller connected with the temperature sensor determines the actual seawater flow according to the water inlet temperature and the water outlet temperature, and generates alarm information when determining that the actual seawater flow is less than a preset seawater flow threshold value. The marine air conditioner can accurately determine whether the actual seawater flow meets the preset seawater flow threshold value of the operation of the marine air conditioner, timely generates corresponding alarm information and reminds when the actual seawater flow does not meet the preset seawater flow threshold value, and timely early warning and protection of the marine air conditioner are achieved.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to a marine air conditioner and a seawater flow detection control method and device based on the marine air conditioner.
Background
With the increasing development of air conditioner technology and the gradual use of air conditioners in different application scenes, marine air conditioners are appeared. The marine air conditioner mostly adopts a vapor compression refrigeration cycle to work, and after absorbing indoor heat, a refrigerant is compressed by a compressor to become high-temperature and high-pressure gas which enters a condenser to be condensed and release heat. The secondary refrigerant in the condenser is used for taking away condensation heat, so that heat exchange is realized, and the stability of condensation pressure is ensured. In order to ensure the stable operation of the compressor and the refrigeration system, the heat exchange capacity of the condenser needs to be ensured to be stable, wherein the heat exchange capacity of the condenser is determined according to the temperature difference of the seawater inlet and outlet and the quality of the seawater.
The marine air conditioner usually uses seawater as a coolant, however, in practical use, many factors cause fluctuation of seawater flow or seawater pressure. At present, the conventional method is to add a water flow switch or a water pressure switch at a water inlet of the marine air conditioner for detection, and the water flow switch is disconnected when the water flow is too low or the water pressure is too low. When the control system detects a disconnection signal, a low-flow alarm is sent out, and the unit is unloaded or is protected to be shut down so as to avoid overhigh condensation pressure.
However, as the marine air conditioner uses seawater for cooling, the water flow switch is protected by detecting the flow velocity of the seawater, the seawater corrosion is strong, the detection target plate is directly contacted with the seawater, the corrosion is fast, and the fault rate of the water flow switch is high. The water pressure switch protects by detecting the pressure of the seawater pipeline, but the seawater pressure and the seawater flow have no direct relation, and the water pressure switch is only used for detecting, so that the problem of error protection or leakage protection is easy to occur. Therefore, the reliability of the conventional implementation mode for maintaining the stable operation of the unit is still poor, the accuracy of the captured switch off signal is low, and the early warning and the protection of the marine air conditioner cannot be realized in time.
Disclosure of Invention
Therefore, in order to solve the above technical problems, it is necessary to provide a marine air conditioner capable of improving timeliness of warning and protection for the marine air conditioner, and a method and an apparatus for detecting and controlling seawater flow based on the marine air conditioner.
A marine air conditioner including a compressor, a condenser, an evaporator and a throttle device, the marine air conditioner further comprising:
the temperature sensors are arranged on the water inlet pipe and the water outlet pipe of the condenser and are used for collecting the water inlet temperature and the water outlet temperature of seawater of the marine air conditioner, and the seawater is used as a secondary refrigerant of the marine air conditioner;
and the air conditioner controller connected with the temperature sensor determines the actual seawater flow according to the inlet water temperature and the outlet water temperature, and generates alarm information when determining that the actual seawater flow is less than a preset seawater flow threshold value.
In one embodiment, the temperature sensor is in contact with the seawater through a blind pipe;
an elastic sheet pushing device is arranged in the blind pipe and used for fixing the temperature sensor;
and the blind pipe is filled with a heat transfer medium for transferring the temperature of the seawater.
A seawater flow detection control method based on a marine air conditioner comprises the following steps:
acquiring the inlet water temperature and the outlet water temperature of seawater of a marine air conditioner, wherein the seawater is used as a secondary refrigerant of the marine air conditioner;
determining the actual seawater flow according to the inlet water temperature and the outlet water temperature;
and when the actual seawater flow is determined to be smaller than a preset seawater flow threshold value, generating alarm information.
In one embodiment, the method further comprises:
and controlling the marine air conditioner to unload or reduce the frequency according to the alarm information.
In one embodiment, after the controlling the marine air conditioner to unload or reduce the frequency according to the alarm information, the method includes:
judging whether the unloading or the frequency reduction of the marine air conditioner reaches a minimum value;
when the unloading or frequency reduction of the marine air conditioner is determined not to reach the lowest value, detecting the running state of the marine air conditioner;
and when the marine air conditioner is detected to be in a stable operation state, measuring the actual seawater flow in the stable operation state, and performing detection control of a new period according to the actual seawater flow.
In one embodiment, the method further comprises:
and when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value and the actual seawater flow is detected to be smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running.
In one embodiment, the controlling the marine air conditioner to stop operating when it is determined that the unloading or the frequency reduction of the marine air conditioner reaches a minimum value and it is detected that the actual seawater flow is smaller than the preset seawater flow threshold value includes:
when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value, acquiring a seawater flow proportion value corresponding to a load of the marine air conditioner in operation in a stable operation state;
generating an updated preset seawater flow threshold according to the seawater flow proportion value and the preset seawater flow threshold;
comparing the actual seawater flow rate in the stable operation state with the updated preset seawater flow rate threshold value;
and when the actual seawater flow is smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running.
In one embodiment, after the controlling the marine air conditioner to stop operating when it is determined that the unloading or the frequency reduction of the marine air conditioner reaches the minimum value and it is detected that the actual seawater flow is less than the preset seawater flow threshold value, the method further includes:
acquiring the temperature difference of inlet and outlet water of the marine air conditioner within a preset continuous time period;
comparing the temperature difference of the inlet water and the outlet water in the preset continuous time period with a preset temperature difference threshold value of the inlet water and the outlet water in sequence;
and when the water inlet and outlet temperature difference in the preset continuous time period is determined to be greater than the preset water inlet and outlet temperature difference threshold value, controlling the marine air conditioner to operate.
In one embodiment, the determining an actual flow rate of seawater according to the inlet water temperature and the outlet water temperature includes:
generating an actual water inlet and outlet temperature difference according to the water inlet temperature and the water outlet temperature;
obtaining rated water flow and rated water inlet and outlet temperature difference of the marine air conditioner;
and determining the actual seawater flow according to the rated water flow, the rated water inlet and outlet temperature difference and the actual water inlet and outlet temperature difference.
In one embodiment, after the controlling the marine air conditioner to operate when it is determined that the water inlet and outlet temperature differences within the preset continuous time period are both greater than the preset water inlet and outlet temperature difference threshold value, the method further includes:
and when the number of times of the stop operation of the marine air conditioner reaches a preset stop number threshold value in a preset detection period, controlling the marine air conditioner to be switched to a manual starting mode.
A sea water flow detection control device based on a marine air conditioner, the device comprises:
the acquisition module is used for acquiring the water inlet temperature and the water outlet temperature of the marine air conditioner, and the seawater is used as a secondary refrigerant of the marine air conditioner;
the actual seawater flow determining module is used for determining the actual seawater flow according to the inlet water temperature and the outlet water temperature;
and the alarm information generation module is used for generating alarm information when the actual seawater flow is determined to be smaller than a preset seawater flow threshold value.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring the inlet water temperature and the outlet water temperature of seawater of a marine air conditioner, wherein the seawater is used as a secondary refrigerant of the marine air conditioner;
determining the actual seawater flow according to the inlet water temperature and the outlet water temperature;
and when the actual seawater flow is determined to be smaller than a preset seawater flow threshold value, generating alarm information.
According to the marine air conditioner and the seawater flow detection control method and device based on the marine air conditioner, the actual seawater flow is determined by obtaining the inlet water temperature and the outlet water temperature of the seawater of the marine air conditioner and according to the inlet water temperature and the outlet water temperature. And when the actual seawater flow is determined to be smaller than a preset seawater flow threshold value, generating alarm information. The actual seawater flow can be determined in real time according to the inlet and outlet water temperatures of the marine air conditioner, so that whether the actual seawater flow meets the preset seawater flow threshold value of the operation of the marine air conditioner can be accurately determined, and corresponding alarm information is timely generated and reminded when the actual seawater flow does not meet the preset seawater flow threshold value, so that the marine air conditioner can be timely pre-warned and protected.
Drawings
FIG. 1 is a schematic structural diagram of a marine air conditioner in one embodiment;
FIG. 2 is a schematic view showing an installation structure of a temperature sensor of the marine air conditioner in one embodiment;
FIG. 3 is a schematic flow chart of a seawater flow detection control method based on a marine air conditioner according to an embodiment;
FIG. 4 is a schematic flow chart of a seawater flow detection control method based on a marine air conditioner in another embodiment;
FIG. 5 is a schematic flow chart illustrating a method for detecting and controlling seawater flow based on a marine air conditioner according to still another embodiment;
fig. 6 is a block diagram of a seawater flow detection control device based on a marine air conditioner in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided a marine air conditioner, as shown in fig. 1, comprising a compressor 102, a condenser 104, a throttling device 106, an evaporator 108, a temperature sensor 110, and an air conditioner controller 112, wherein:
the compressor 102 is configured to draw a low-temperature low-pressure gaseous refrigerant from the evaporator 108 and compress the low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant.
Specifically, referring to fig. 1, the compressor 102 is connected at one end to the evaporator 108 and at the other end to the condenser 104, and is configured to draw a low-temperature and low-pressure gaseous refrigerant from the evaporator 108, compress the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and send the high-temperature and high-pressure gaseous refrigerant to the connected condenser 104.
And a condenser 104 having one end connected to the compressor 102 and the other end connected to one end of the throttling device 106, for dissipating heat of the high-temperature and high-pressure gas refrigerant into the air, condensing the high-temperature and high-pressure gas refrigerant into a liquid refrigerant, and sending the liquid refrigerant to the throttling device 106.
Specifically, one end of the condenser 104 is connected to the compressor 102, and the other end is connected to one end of the throttling device 106, and is configured to receive the high-temperature high-pressure gaseous refrigerant sent by the compressor 102, and radiate heat of the high-temperature high-pressure gaseous refrigerant to the air, so as to condense the high-temperature high-pressure gaseous refrigerant into a medium-temperature high-pressure liquid refrigerant, and send the medium-temperature high-pressure liquid refrigerant to the throttling device 106.
The throttling device 106 has one end connected to the condenser 104 and the other end connected to the evaporator 108, and is configured to perform cooling and pressurizing treatment on the medium-temperature high-pressure liquid refrigerant sent by the condenser to generate a low-temperature low-pressure liquid refrigerant, and transmit the low-temperature low-pressure liquid refrigerant to the evaporator 108.
The evaporator 108 has one end connected to the throttle device 106 and the other end connected to the compressor 102, and is configured to evaporate the low-temperature and low-pressure liquid refrigerant into a gaseous refrigerant to lower the indoor temperature. At the same time, gaseous refrigerant is also sent to the compressor 102.
The temperature sensors 110 disposed at the inlet pipe and the outlet pipe of the condenser 104 collect the inlet water temperature and the outlet water temperature of the seawater of the marine air conditioner.
Specifically, the water inlet pipe and the water outlet pipe of the condenser 104 are respectively provided with a temperature sensor 110 for collecting the inlet water temperature and the outlet water temperature of the seawater of the marine air conditioner. Wherein, the seawater is used as the refrigerating medium of the marine air conditioner.
In one embodiment, as shown in fig. 2, there is provided a schematic diagram of an installation structure of a temperature sensor of a marine air conditioner, and referring to fig. 2, the temperature sensor 204 is in contact with seawater through a blind pipe 208. Wherein, be provided with the shell fragment in the blind pipe 208 and push up tight device 202 for fix temperature sensor 204 in blind pipe 208, make temperature sensor 204 and blind pipe 208 closely laminate. The blind pipe 208 is filled with a heat transfer medium 206 for transferring the temperature of the seawater, so as to ensure timely and accurate transfer of the temperature of the seawater.
Furthermore, a blind pipe for temperature measurement is respectively arranged on a water inlet pipeline and a water outlet pipeline of the condenser, the blind pipe is made of copper alloy with excellent heat conductivity and better corrosion resistance, and can be made of BFe30-1-1 material with better seawater corrosion. Wherein, the temperature sensor of intaking is installed in the blind pipe of inlet channel, and the temperature sensor of leaving water is installed in the blind pipe of outlet channel.
And the air conditioner controller 112 connected with the temperature sensor 110 determines the actual seawater flow according to the inlet water temperature and the outlet water temperature, and generates alarm information when determining that the actual seawater flow is less than a preset seawater flow threshold value.
In the marine air conditioner, the water inlet temperature and the water outlet temperature of seawater of the marine air conditioner are obtained through the temperature sensor, and the actual seawater flow is determined through the air conditioner controller according to the water inlet temperature and the water outlet temperature. And when the actual seawater flow is determined to be smaller than the preset seawater flow threshold value, generating alarm information. The actual seawater flow can be determined in real time according to the inlet and outlet water temperatures of the marine air conditioner, so that whether the actual seawater flow meets the preset seawater flow threshold value of the operation of the marine air conditioner can be accurately determined, and corresponding alarm information is timely generated and reminded when the actual seawater flow does not meet the preset seawater flow threshold value, so that the marine air conditioner can be timely pre-warned and protected.
In one embodiment, as shown in fig. 3, a method for detecting and controlling seawater flow based on a marine air conditioner is provided, and this embodiment is illustrated by applying the method to the marine air conditioner, it is to be understood that the method may also be applied to a server, and may also be applied to a system including the marine air conditioner and the server, and is implemented by interaction between the marine air conditioner and the server. In this embodiment, the method includes the following steps:
step S302, the inlet water temperature and the outlet water temperature of the seawater of the marine air conditioner are obtained.
Specifically, a water inlet pipe and a water outlet pipe of the condenser of the marine air conditioner are respectively provided with a temperature sensor, and the temperature sensors comprise a water inlet temperature sensor and a water outlet temperature sensor which respectively acquire the water inlet temperature and the water outlet temperature of seawater serving as secondary refrigerant. Wherein, during practical application, seawater is adopted as the secondary refrigerant of the marine air conditioner.
And step S304, determining the actual seawater flow according to the inlet water temperature and the outlet water temperature.
Specifically, the actual water inlet and outlet temperature difference is calculated according to the water inlet temperature and the water outlet temperature, and the actual seawater flow is determined according to the rated water flow, the rated water inlet and outlet temperature difference and the actual water inlet and outlet temperature difference by obtaining the rated water flow and the rated water inlet and outlet temperature difference of the marine air conditioner.
Wherein the water inlet temperature detected by the water inlet temperature sensor is TInflow waterThe outlet water temperature detected by the outlet water temperature sensor is TDischarging water. When the compressor is started and normally operates, for example, after normally operating for 1 minute, the refrigeration system of the marine air conditioner is in a dynamic balance state, and the actual heat exchange quantity Q at the condenser sidePractice ofBasically tending to normal.
Further, the actual heat exchange quantity Q can be calculated by adopting the following formula (1)Actually:
Qpractice of＝c·mPractice of·ΔtPractice of (1)；
Wherein Q isPractice ofC is specific heat constant of seawater, m is actual heat exchange quantityPractice ofFor actual seawater flow, Δ tPractice ofThe temperature difference of inlet water and outlet water is calculated according to the inlet water temperature and the outlet water temperature of the seawater. It can be known that m is after the refrigeration system operates normallyPractice ofAnd Δ tPractice ofThe product of (c) is unchanged. When the actual flow of seawater is mPractice ofWhen the temperature becomes smaller, the temperature difference delta t between the inlet water and the outlet water is obtainedPractice ofIt becomes large.
Further, in the rated design state of the marine air conditioner, the cooling water flow is the rated water flow mRated valueThe temperature difference of the inlet water and the outlet water is the rated temperature difference delta t of the inlet water and the outlet waterRated valueFurther, the following formula (2) can be used to calculate the rated heat exchange quantity QRated value：
QRated value＝c·mRated value·ΔtRated value (2)；
Since the nominal heat exchange amount is equal to the actual heat exchange amount, i.e. QRated value＝QPractice ofThen, the following formula (3) can be obtained according to the above formula (1) and formula (2), and the actual seawater flow m is calculated according to the formula (3)Practice of：
Wherein m isRated valueAnd Δ tRated valueIf the temperature is a preset value, the actual temperature difference delta t of inlet and outlet water is calculated according to the inlet water temperature and the outlet water temperaturePractice ofThen, the actual seawater flow m can be calculatedPractice of。
And S306, generating alarm information when the actual seawater flow is determined to be smaller than the preset seawater flow threshold value.
Specifically, a preset seawater flow threshold value is obtained, the actual seawater flow is compared with the preset seawater flow threshold value, and when the actual seawater flow is determined to be smaller than the preset seawater flow threshold value, alarm information is generated. Wherein, alarm information can be used to indicate to the user that marine air conditioner water flow is too low.
According to the seawater flow detection control method based on the marine air conditioner, the actual seawater flow is determined by obtaining the inlet water temperature and the outlet water temperature of the seawater of the marine air conditioner and according to the inlet water temperature and the outlet water temperature. And when the actual seawater flow is determined to be smaller than the preset seawater flow threshold value, generating alarm information. The actual seawater flow can be determined in real time according to the inlet and outlet water temperatures of the marine air conditioner, so that whether the actual seawater flow meets the preset seawater flow threshold value of the operation of the marine air conditioner can be accurately determined, and corresponding alarm information is timely generated and reminded when the actual seawater flow does not meet the preset seawater flow threshold value, so that the marine air conditioner can be timely pre-warned and protected.
In an embodiment, as shown in fig. 4, a method for detecting and controlling seawater flow based on a marine air conditioner is provided, which specifically includes the following steps:
and S402, controlling the marine air conditioner to unload or reduce the frequency according to the alarm information.
Specifically, when the actual seawater flow is determined to be smaller than the preset seawater flow threshold, after alarm information is generated, the marine air conditioner is controlled to unload or reduce the frequency according to the alarm information. Wherein, the frequency reduction means that the frequency conversion compressor reduces the operation frequency, for example, the rated operation frequency is 50Hz, the cooling capacity is 2500W, and when the frequency is reduced to 25Hz, the cooling capacity is reduced to 1250W. Since the cooling capacity is reduced, the actual heat exchange capacity of the refrigeration system on the seawater side is also reduced.
Wherein, unloading refers to that the ship air conditioner has a compressor for reducing the operation load, and the original operation load is reduced, for example, a screw compressor can be operated under the low load of 25%, 50% and 75% by opening an unloading electromagnetic valve. Similarly, since the cooling capacity is reduced, the actual heat exchange capacity of the refrigeration system on the seawater side is also reduced.
Step S404, judging whether the unloading or the frequency reduction of the marine air conditioner reaches the minimum value.
The down-conversion and unloading of the marine air conditioner cannot be decreased infinitely due to the limitation of the electrical equipment, for example, the operation frequency cannot be decreased after being decreased to a minimum value, for example, 20 Hz. For unloading, for example, after the operating load has decreased to a minimum value, for example, 25% low load, it likewise cannot decrease any further.
Specifically, whether unloading or frequency reduction of the marine air conditioner reaches a minimum value is judged by acquiring a preset running frequency threshold and a preset running load threshold and according to the preset running frequency threshold and the preset running load threshold.
And step S406, detecting the running state of the marine air conditioner when the unloading or frequency reduction of the marine air conditioner is determined not to reach the lowest value.
Specifically, when the current operation frequency or the current operation load of the marine air conditioner is determined according to a preset operation frequency threshold value and an operation load threshold value and the current operation frequency or the current operation load of the marine air conditioner does not reach the corresponding operation frequency threshold value and the corresponding operation load threshold value, the operation state of the marine air conditioner is detected.
And step S408, when the marine air conditioner is determined to be in the stable operation state according to the condensing pressure, measuring the actual seawater flow in the stable operation state, and performing detection control of a new period according to the actual seawater flow.
Specifically, whether the marine air conditioner is in a stable operation state is determined according to the condensing pressure or the evaporating pressure of the marine air conditioner, when the marine air conditioner is determined to be in the stable operation state, the actual seawater flow rate in the stable operation state is measured, and the detection control of a new period is performed according to the actual seawater flow rate. When the condensing pressure or the evaporating pressure of the marine air conditioner is detected and is kept unchanged in a preset time period or the fluctuation range of the marine air conditioner in the preset time period is small, the current marine air conditioner can be determined to be in a stable operation state. The preset time period can be determined according to actual application requirements, and can also be determined according to historical use information of the marine air conditioner.
After unloading or frequency reduction, the refrigerating capacity and the compressor power can be reduced. And the actual heat exchange quantity Q of seawater sidePractice ofThe cooling capacity + compressor power is also reduced. Wherein C is unchanged and m isPractice of·ΔtPractice ofWill become smaller, likewise Δ tPractice ofIt will also become smaller. Due to the condensation temperature and Δ tPractice ofIn a positive correlation, the same is true. For the same reason, the condensing pressureAnd the condensing temperature is also decreased in a positive correlation, thereby maintaining the stability of the refrigeration system of the marine air conditioner.
Further, when the marine air conditioner is detected to be in a stable operation state, the inlet water temperature and the outlet water temperature of the seawater of the marine air conditioning unit are obtained again, and the actual seawater flow is calculated according to the inlet water temperature and the outlet water temperature.
And step S410, when the unloading or the frequency reduction of the marine air conditioner is determined to reach the lowest value and the actual seawater flow is detected to be smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running.
Specifically, when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value, the seawater flow ratio value corresponding to the load of the marine air conditioner in the operation state in the stable operation state is obtained, and the preset seawater flow threshold value is obtained. And generating an updated preset seawater flow threshold according to the seawater flow proportion value and the preset seawater flow threshold, and performing detection control of a new period according to the actual seawater flow, namely re-determining whether the actual seawater flow is smaller than the updated preset seawater flow threshold. And when the actual seawater flow is smaller than the updated preset seawater flow threshold, controlling the marine air conditioner to stop running.
Further, the actual seawater flow rate in the stable operation state is compared with the updated preset seawater flow rate threshold value, and when the actual seawater flow rate is smaller than the preset seawater flow rate threshold value, the marine air conditioner is controlled to stop operating.
In one embodiment, the following formula (4) is used to calculate the seawater flow rate ratio value α corresponding to the load in operation of the marine air conditioner in the steady operation state:
wherein alpha is more than or equal to 0 and less than or equal to 1, and the corresponding minimum water flow rate proportion number alpha under partial load is shown in the following table 1:
TABLE 1
| Serial number | Proportion of partial load (example) | Minimum water flow rate ratio number alpha |
| 1 | 90％ | α9 |
| 2 | 80％ | α8 |
| 3 | 70％ | α7 |
| 4 | 60％ | α6 |
| 5 | 50％ | α5 |
| 6 | 40％ | α4 |
| 7 | 30％ | α3 |
| 8 | 20％ | α2 |
| 9 | 10％ | α1 |
Further, the preset seawater flow threshold m is calculatedMinimum sizeProduct m of sum αMinimum sizeα, and calculating the resulting product mMinimum sizeα and actual seawater flow mPractice ofComparing, and determining mPractice of＜mMinimum sizeAnd when the alpha is larger than the preset value, controlling the marine air conditioner to stop running.
According to the seawater flow detection control method based on the marine air conditioner, the marine air conditioner is controlled to unload or reduce the frequency according to the alarm information, and whether the unloading or reducing frequency of the marine air conditioner reaches the lowest value or not is judged. When the unloading or frequency reduction of the marine air conditioner is determined not to reach the lowest value, the running state of the marine air conditioner is detected, and when the marine air conditioner is detected to be in the stable running state, the actual seawater flow in the stable running state is measured, and the detection control of a new period is carried out according to the actual seawater flow. And when the unloading or the frequency reduction of the marine air conditioner is determined to reach the lowest value and the actual seawater flow is detected to be smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running. The method realizes that whether alarm information needs to be sent out or not is determined according to the actual seawater flow when the marine air conditioner is unloaded or subjected to frequency reduction each time, and when the lowest value of unloading or frequency reduction is reached, the air conditioning unit is controlled to stop running, so that accurate early warning and protection on the air conditioning unit are realized.
In an embodiment, as shown in fig. 5, a method for detecting and controlling seawater flow based on a marine air conditioner is provided, which specifically includes the following steps:
and step S502, acquiring the temperature difference between inlet water and outlet water of the marine air conditioner in a preset continuous time period.
Specifically, after the unloading or the frequency reduction of the marine air conditioner is determined to reach the lowest value, and the actual seawater flow is detected to be smaller than the preset seawater flow threshold value, the marine air conditioner is controlled to stop running, and after the marine air conditioner stops running for a preset time length, for example, after the marine air conditioner stops running for 2 to 5 minutes, the temperature difference between the inlet water and the outlet water of the marine air conditioner is detected within a preset continuous time period. Wherein the preset continuous time period may take 1 to 2 minutes.
Step S504, the temperature difference of the inlet and outlet water in the preset continuous time period is compared with the preset temperature difference threshold of the inlet and outlet water in sequence.
Specifically, a preset water inlet and outlet temperature difference threshold is obtained, the preset water inlet and outlet temperature difference threshold in this embodiment may be 1 to 2 ℃, and all water inlet and outlet temperature differences detected in a preset continuous time period are compared with the preset water inlet and outlet temperature difference threshold in sequence.
And step S506, when the water inlet and outlet temperature difference in the preset continuous time period is determined to be larger than the preset water inlet and outlet temperature difference threshold value, controlling the marine air conditioner to operate.
Specifically, all the water inlet and outlet temperature differences detected in the preset continuous time period are sequentially compared with the preset water inlet and outlet temperature difference threshold value, when all the water inlet and outlet temperature differences detected in the preset continuous time period are determined to be greater than the preset water inlet and outlet temperature difference threshold value, the fault is automatically recovered, and the compressor of the marine air conditioner is controlled to be restarted, namely the marine air conditioner can be operated again.
And step S508, when the number of times of the stop operation of the marine air conditioner reaches a preset stop number threshold value in a preset detection period, controlling the marine air conditioner to be switched to a manual starting mode.
Specifically, in order to avoid that the actual water flow always cannot meet the requirement of the minimum water flow, the failure recovery times are too many, and the service life of the compressor is influenced by frequent start and stop. After a certain number of times of faults occur, the marine air conditioner is controlled to be switched to a manual starting mode, namely, the compressor cannot be automatically recovered, and the operation is recovered after a startup and shutdown key is manually pressed.
Wherein, the preset detection period may be set to 60 to 75 minutes, and the preset stop number threshold may be set to 3 to 5 times. For example, when the number of times that the marine air conditioner stops running reaches the preset stop number threshold value of 3 times within 60 minutes of the preset detection period, the marine air conditioner is controlled to be switched to the manual starting mode.
According to the seawater flow detection control method based on the marine air conditioner, the inlet and outlet water temperature difference of the marine air conditioner in the preset continuous time period is obtained, and the inlet and outlet water temperature difference in the preset continuous time period is compared with the preset inlet and outlet water temperature difference threshold value in sequence. And when the water inlet and outlet temperature difference in the preset continuous time period is determined to be greater than the preset water inlet and outlet temperature difference threshold value, controlling the operation of the marine air conditioner. And when the number of times of the stop operation of the marine air conditioner reaches a preset stop number threshold value in a preset detection period, controlling the marine air conditioner to be switched to a manual starting mode. The method realizes that whether the operation of the marine air conditioner can be automatically recovered or not is determined according to the water inlet and outlet temperature difference of the marine air conditioner in the preset continuous time period and the set water inlet and outlet temperature difference threshold value, and the working efficiency of the marine air conditioner is improved without manual adjustment of a user.
It should be understood that, although the steps in the flowcharts related to the above embodiments are shown in sequence as indicated by the arrows, the steps are not necessarily executed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in each flowchart related to the above embodiments may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a part of the steps or stages in other steps.
In one embodiment, as shown in fig. 6, there is provided a marine air conditioner based seawater flow rate detection control apparatus, including: an obtaining module 602, an actual seawater flow determining module 604, and an alarm information generating module 606, wherein:
the obtaining module 602 is configured to obtain an inlet water temperature and an outlet water temperature of the marine air conditioner, and the seawater is used as a coolant of the marine air conditioner.
And an actual seawater flow determining module 604, configured to determine an actual seawater flow according to the inlet water temperature and the outlet water temperature.
And an alarm information generating module 606, configured to generate alarm information when it is determined that the actual seawater flow is smaller than the preset seawater flow threshold.
In the seawater flow detection and control device based on the marine air conditioner, the actual seawater flow is determined by acquiring the inlet water temperature and the outlet water temperature of the seawater of the marine air conditioner and according to the inlet water temperature and the outlet water temperature. And when the actual seawater flow is determined to be smaller than the preset seawater flow threshold value, generating alarm information. The actual seawater flow can be determined in real time according to the inlet and outlet water temperatures of the marine air conditioner, so that whether the actual seawater flow meets the preset seawater flow threshold value of the operation of the marine air conditioner can be accurately determined, and corresponding alarm information is timely generated and reminded when the actual seawater flow does not meet the preset seawater flow threshold value, so that the marine air conditioner can be timely pre-warned and protected.
In one embodiment, a marine air conditioner based seawater flow detection control device is provided, further comprising:
and the unloading or frequency reducing module is used for controlling the marine air conditioner to unload or reduce the frequency according to the alarm information.
And the judging module is used for judging whether the unloading or the frequency reduction of the marine air conditioner reaches the lowest value.
And the running state detection module is used for detecting the running state of the marine air conditioner when the unloading or frequency reduction of the marine air conditioner is determined to be not lower than the lowest value.
And the detection control module is used for measuring the actual seawater flow in the stable operation state when detecting that the marine air conditioner is in the stable operation state, and performing detection control of a new period according to the actual seawater flow.
And the operation stopping control module is used for controlling the marine air conditioner to stop operating when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value and the actual seawater flow is detected to be smaller than the preset seawater flow threshold value.
In the seawater flow detection and control device based on the marine air conditioner, the marine air conditioner is controlled to unload or reduce the frequency according to the alarm information, and whether the unloading or reducing frequency of the marine air conditioner reaches the minimum value or not is judged. When the unloading or frequency reduction of the marine air conditioner is determined not to reach the lowest value, the running state of the marine air conditioner is detected, and when the marine air conditioner is detected to be in the stable running state, the actual seawater flow in the stable running state is measured, and the detection control of a new period is carried out according to the actual seawater flow. And when the unloading or the frequency reduction of the marine air conditioner is determined to reach the lowest value and the actual seawater flow is detected to be smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running. The method realizes that whether alarm information needs to be sent out or not is determined according to the actual seawater flow when the marine air conditioner is unloaded or subjected to frequency reduction each time, and when the lowest value of unloading or frequency reduction is reached, the air conditioning unit is controlled to stop running, so that accurate early warning and protection on the air conditioning unit are realized.
In one embodiment, a marine air conditioner based seawater flow detection control device is provided, further comprising:
and the water inlet and outlet temperature difference acquisition module is used for acquiring the water inlet and outlet temperature difference of the marine air conditioner in a preset continuous time period.
And the comparison module is used for sequentially comparing the water inlet and outlet temperature difference in the preset continuous time period with a preset water inlet and outlet temperature difference threshold value.
And the marine air conditioner operation control module is used for controlling the marine air conditioner to operate when the water inlet and outlet temperature difference in the preset continuous time period is determined to be greater than the preset water inlet and outlet temperature difference threshold value.
And the manual starting mode switching module is used for controlling the marine air conditioner to be switched to the manual starting mode when the number of times of stopping the operation of the marine air conditioner reaches a preset stopping number threshold value in a preset detection period.
In the seawater flow detection and control device based on the marine air conditioner, the inlet and outlet water temperature difference of the marine air conditioner in the preset continuous time period is obtained, and the inlet and outlet water temperature difference in the preset continuous time period is sequentially compared with the preset inlet and outlet water temperature difference threshold value. And when the water inlet and outlet temperature difference in the preset continuous time period is determined to be greater than the preset water inlet and outlet temperature difference threshold value, controlling the operation of the marine air conditioner. And when the number of times of the stop operation of the marine air conditioner reaches a preset stop number threshold value in a preset detection period, controlling the marine air conditioner to be switched to a manual starting mode. The method realizes that whether the operation of the marine air conditioner can be automatically recovered or not is determined according to the water inlet and outlet temperature difference of the marine air conditioner in the preset continuous time period and the set water inlet and outlet temperature difference threshold value, and the working efficiency of the marine air conditioner is improved without manual adjustment of a user.
In one embodiment, the actual seawater flow determination module is further configured to:
generating an actual water inlet and outlet temperature difference according to the water inlet temperature and the water outlet temperature; obtaining rated water flow and rated water inlet and outlet temperature difference of a marine air conditioner; and determining the actual seawater flow according to the rated water flow, the rated water inlet and outlet temperature difference and the actual water inlet and outlet temperature difference.
In one embodiment, the shutdown control module is further to:
when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value, acquiring a seawater flow proportion value corresponding to a load of the marine air conditioner in a stable operation state in operation; generating an updated preset seawater flow threshold according to the seawater flow proportion value and the preset seawater flow threshold; comparing the actual seawater flow rate in the stable operation state with the updated preset seawater flow rate threshold value; and when the actual seawater flow is smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running.
For specific limitations of the marine air conditioner based seawater flow detection control device, reference may be made to the above limitations of the marine air conditioner based seawater flow detection control method, and details thereof are not repeated here. All or part of the modules in the seawater flow detection and control device based on the marine air conditioner can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring the inlet water temperature and the outlet water temperature of seawater of the marine air conditioner, wherein the seawater is used as a secondary refrigerant of the marine air conditioner;
determining the actual seawater flow according to the inlet water temperature and the outlet water temperature;
and when the actual seawater flow is determined to be smaller than the preset seawater flow threshold value, generating alarm information.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and controlling the marine air conditioner to unload or reduce the frequency according to the alarm information.
In one embodiment, the computer program when executed by the processor further performs the steps of:
judging whether the unloading or frequency reduction of the marine air conditioner reaches a minimum value;
when the unloading or frequency reduction of the marine air conditioner is determined to not reach the lowest value, detecting the running state of the marine air conditioner;
and when the marine air conditioner is detected to be in a stable operation state, measuring the actual seawater flow in the stable operation state, and performing detection control of a new period according to the actual seawater flow.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value and the actual seawater flow is detected to be smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running.
In one embodiment, the computer program when executed by the processor further performs the steps of:
when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value, acquiring a seawater flow proportion value corresponding to a load of the marine air conditioner in a stable operation state in operation;
generating an updated preset seawater flow threshold according to the seawater flow proportion value and the preset seawater flow threshold;
comparing the actual seawater flow rate in the stable operation state with the updated preset seawater flow rate threshold value;
and when the actual seawater flow is smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running.
In one embodiment, the computer program when executed by the processor further performs the steps of:
acquiring the water inlet and outlet temperature difference of the marine air conditioner in a preset continuous time period;
comparing the temperature difference of inlet and outlet water in a preset continuous time period with a preset temperature difference threshold value of inlet and outlet water in sequence;
and when the water inlet and outlet temperature difference in the preset continuous time period is determined to be greater than the preset water inlet and outlet temperature difference threshold value, controlling the operation of the marine air conditioner.
In one embodiment, the computer program when executed by the processor further performs the steps of:
generating an actual water inlet and outlet temperature difference according to the water inlet temperature and the water outlet temperature;
obtaining rated water flow and rated water inlet and outlet temperature difference of a marine air conditioner;
and determining the actual seawater flow according to the rated water flow, the rated water inlet and outlet temperature difference and the actual water inlet and outlet temperature difference.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and when the number of times of stopping the operation of the marine air conditioner reaches a preset stop number threshold value in a preset detection period, controlling the marine air conditioner to be switched to a manual starting mode.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. The marine air conditioner comprises a compressor, a condenser, an evaporator and a throttling device, and is characterized by further comprising:
the temperature sensors are arranged on the water inlet pipe and the water outlet pipe of the condenser and are used for collecting the water inlet temperature and the water outlet temperature of seawater of the marine air conditioner, and the seawater is used as a secondary refrigerant of the marine air conditioner;
and the air conditioner controller connected with the temperature sensor determines the actual seawater flow according to the inlet water temperature and the outlet water temperature, and generates alarm information when determining that the actual seawater flow is less than a preset seawater flow threshold value.
2. The marine air conditioner of claim 1, wherein said temperature sensor is in contact with said seawater through a blind pipe;
an elastic sheet pushing device is arranged in the blind pipe and used for fixing the temperature sensor;
and the blind pipe is filled with a heat transfer medium for transferring the temperature of the seawater.
3. A seawater flow detection control method based on a marine air conditioner is characterized by comprising the following steps:
acquiring the inlet water temperature and the outlet water temperature of seawater of a marine air conditioner, wherein the seawater is used as a secondary refrigerant of the marine air conditioner;
determining the actual seawater flow according to the inlet water temperature and the outlet water temperature;
and when the actual seawater flow is determined to be smaller than a preset seawater flow threshold value, generating alarm information.
4. The method of claim 3, further comprising:
and controlling the marine air conditioner to unload or reduce the frequency according to the alarm information.
5. The method of claim 4, after the controlling the marine air conditioner to unload or reduce the frequency according to the alarm information, comprising:
judging whether the unloading or the frequency reduction of the marine air conditioner reaches a minimum value;
when the unloading or frequency reduction of the marine air conditioner is determined not to reach the lowest value, detecting the running state of the marine air conditioner;
and when the marine air conditioner is detected to be in a stable operation state, measuring the actual seawater flow in the stable operation state, and performing detection control of a new period according to the actual seawater flow.
6. The method of claim 5, further comprising:
and when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value and the actual seawater flow is detected to be smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running.
7. The method of claim 6, wherein when it is determined that the unloading or down-conversion of the marine air conditioner reaches a minimum value and it is detected that the actual seawater flow rate is less than the preset seawater flow rate threshold value, controlling the marine air conditioner to stop operating comprises:
when the unloading or frequency reduction of the marine air conditioner is determined to reach the lowest value, acquiring a seawater flow proportion value corresponding to a load of the marine air conditioner in operation in a stable operation state;
generating an updated preset seawater flow threshold according to the seawater flow proportion value and the preset seawater flow threshold;
comparing the actual seawater flow rate in the stable operation state with the updated preset seawater flow rate threshold value;
and when the actual seawater flow is smaller than the preset seawater flow threshold value, controlling the marine air conditioner to stop running.
8. The method of claim 6, further comprising, after the controlling the marine air conditioner to stop operating when it is determined that the unloading or down-conversion of the marine air conditioner reaches a minimum value and it is detected that the actual seawater flow rate is less than the preset seawater flow rate threshold value:
acquiring the temperature difference of inlet and outlet water of the marine air conditioner within a preset continuous time period;
comparing the temperature difference of the inlet water and the outlet water in the preset continuous time period with a preset temperature difference threshold value of the inlet water and the outlet water in sequence;
and when the water inlet and outlet temperature difference in the preset continuous time period is determined to be greater than the preset water inlet and outlet temperature difference threshold value, controlling the marine air conditioner to operate.
9. The method of claim 3, wherein determining an actual flow rate of seawater based on the incoming water temperature and the outgoing water temperature comprises:
generating an actual water inlet and outlet temperature difference according to the water inlet temperature and the water outlet temperature;
obtaining rated water flow and rated water inlet and outlet temperature difference of the marine air conditioner;
and determining the actual seawater flow according to the rated water flow, the rated water inlet and outlet temperature difference and the actual water inlet and outlet temperature difference.
10. The method of claim 8, further comprising, after said controlling the operation of the marine air conditioner when it is determined that the water inlet and outlet temperature differences within the preset continuous time period are both greater than the preset water inlet and outlet temperature difference threshold value:
and when the number of times of the stop operation of the marine air conditioner reaches a preset stop number threshold value in a preset detection period, controlling the marine air conditioner to be switched to a manual starting mode.
11. A sea water flow detection control device based on marine air conditioner is characterized by comprising:
the acquisition module is used for acquiring the water inlet temperature and the water outlet temperature of the marine air conditioner, and the seawater is used as a secondary refrigerant of the marine air conditioner;
the actual seawater flow determining module is used for determining the actual seawater flow according to the inlet water temperature and the outlet water temperature;
and the alarm information generation module is used for generating alarm information when the actual seawater flow is determined to be smaller than a preset seawater flow threshold value.
12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 3 to 10.
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