CN111417288A - Overhead type electrical cabinet environment control method and system - Google Patents
Overhead type electrical cabinet environment control method and system Download PDFInfo
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- CN111417288A CN111417288A CN202010248740.2A CN202010248740A CN111417288A CN 111417288 A CN111417288 A CN 111417288A CN 202010248740 A CN202010248740 A CN 202010248740A CN 111417288 A CN111417288 A CN 111417288A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20309—Evaporators
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20318—Condensers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20354—Refrigerating circuit comprising a compressor
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Abstract
The invention relates to the technical field of electrical cabinets, in particular to an overhead electrical cabinet environment control method and system. The control method comprises a refrigeration mode, a dehumidification mode and a standby mode, the system comprises a mounting cabinet, a compressor, an evaporator and a condenser are mounted on the mounting cabinet, a working medium outlet of the condenser is connected with a working medium inlet of the evaporator, a working medium outlet of the evaporator is connected with a working medium inlet of the compressor, the working medium outlet of the compressor is connected with the working medium inlet of the condenser, the mounting cabinet is provided with an air inlet and an air outlet which are communicated with the interior of the electric cabinet, a refrigerating air duct is arranged between the air inlet and the air outlet, an inner fan is arranged at the air inlet and/or the air outlet, the evaporator is arranged in the refrigerating air duct, the refrigeration and dehumidification are completed by a refrigeration module consisting of a compressor, an evaporator and a condenser, the invention relates to an electric cabinet, which is used for adjusting the environment in the cabinet and ensuring that the environmental parameters of the electric cabinet are within a reasonable range.
Description
Technical Field
The invention relates to the technical field of electrical cabinets, in particular to an overhead electrical cabinet environment control method and system.
Background
A large number of electrical components are arranged in the high-low voltage electrical cabinet, the voltage is high, the current is large, heat can be continuously generated in the high-low voltage electrical cabinet due to load loss, the temperature rises, and the temperature is particularly obvious in summer, so that the temperature in the cabinet needs to be controlled, the normal operation of the electrical components is prevented from being influenced due to overhigh temperature rise, and even the electricity utilization safety is prevented from being influenced, so that accidents are caused; in addition, if reasonable environmental parameters (temperature, humidity and the like) are not kept in the electrical cabinet, the electrical cabinet also has great potential safety hazard.
Disclosure of Invention
In order to solve the problem that potential hazards exist due to the fact that environmental parameters of an electric cabinet are not reasonable in the prior art, the invention provides a top-mounted electric cabinet environmental control method and system for achieving reasonable environmental parameters.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an overhead electrical cabinet environment control method comprises a refrigeration mode and comprises the following steps:
s01: setting a set temperature in the cabinet, detecting the actual temperature, the ambient temperature and the ambient humidity in the cabinet, and calculating the ambient dew point temperature according to the ambient temperature and the ambient humidity;
s02: comparing the set temperature in the cabinet with the environmental dew point temperature, and calculating the target temperature in the cabinet according to the comparison result:
s21: if the ambient dew point temperature plus the first set difference is greater than the set temperature in the cabinet, the target temperature in the cabinet is the ambient dew point temperature plus the first set difference;
s22: if the environmental dew point temperature plus the first set difference value is less than or equal to the set temperature in the cabinet, the target temperature in the cabinet is equal to the set temperature in the cabinet;
03: the temperature control method comprises the following steps:
when the actual temperature in the cabinet is higher than the target temperature in the cabinet, refrigerating;
and when the actual temperature in the cabinet is less than or equal to the target temperature in the cabinet, ending the refrigeration.
Further, a dehumidification mode is also included, comprising the following steps:
s01: detecting the actual temperature, the humidity and the ambient temperature in the cabinet, and calculating the dew point temperature in the cabinet in real time according to the actual temperature and the humidity in the cabinet;
s02: the humidity control method comprises the following steps:
when the operation lower limit temperature is less than or equal to the actual temperature in the cabinet and less than or equal to the target temperature in the cabinet, and the dew point temperature in the cabinet is greater than or equal to the environmental temperature; dehumidifying, wherein the operation lower limit temperature is artificially set;
the method also comprises a forced dehumidification mode, and the specific method comprises the following steps:
when the actual humidity in the cabinet is detected to be larger than or equal to the upper limit value of the humidity, the dehumidification mode is forcibly entered, and when the actual humidity in the cabinet is smaller than or equal to the recovery value of the humidity, the refrigeration or dehumidification mode is started according to logic；Wherein, the humidity upper limit value and the temperature recovery value are both set manually;
when the temperature in the cabinet is higher than the target temperature in the cabinet, entering a refrigeration mode;
and when the actual temperature in the cabinet is less than or equal to the target temperature in the cabinet and the dew point temperature in the cabinet is less than the ambient temperature-a second set difference value, the system enters a standby mode, and refrigeration and dehumidification are suspended in the standby mode.
The system for implementing the environmental control method of the overhead electrical cabinet comprises a refrigeration system and a controller, the refrigerating system comprises an installation cabinet, a compressor, an evaporator and a condenser are arranged in the installation cabinet, the working medium outlet of the condenser is connected with the working medium inlet of the evaporator, the working medium outlet of the evaporator is connected with the working medium inlet of the compressor, the working medium outlet of the compressor is connected with the working medium inlet of the condenser, the mounting cabinet is provided with an air inlet and an air outlet which are communicated with the interior of the electric cabinet, a refrigeration air duct is arranged between the air inlet and the air outlet, an inner fan is arranged at the air inlet and/or the air outlet, the evaporator is arranged in the refrigeration air channel, refrigeration and dehumidification are completed through a condensation module consisting of the compressor, the evaporator and the condenser, and dehumidification is realized through condensation of hot air in the electric cabinet in the evaporator.
Furthermore, the mounting cabinet is also provided with a cooling air duct, the condenser is arranged at one end of the cooling air duct, the other end of the mounting cabinet is provided with an air port, and the air port is provided with an outer fan.
Further, in the refrigeration mode, the inner fan, the compressor and the outer fan are all started;
in the dehumidification mode, the inner fan, the compressor and the outer fan are all started;
in the standby mode, the compressor and the outer fan are closed, and the inner fan is opened or closed: when the inner fan enters a standby mode, the inner fan delays for a first set time and then judges the temperature control requirement, and if the temperature control requirement does not meet the standby mode, a refrigeration or dehumidification mode is started according to logic; and if the fan is still in the standby mode, stopping the inner fan.
Furthermore, a condensation temperature sensor for detecting the temperature of the condenser is arranged near the condenser, the artificially set temperature of the outer fan is compared with the temperature of the condenser, when the temperature of the condenser is less than or equal to the temperature of the outer fan, the outer fan is closed, and when the temperature of the condenser is more than or equal to the temperature of the outer fan, the outer fan is opened.
Furthermore, an ozone concentration detection device and an alarm device are arranged in the electrical cabinet, when the ozone concentration is detected to be larger than or equal to a set ozone concentration protection value and lasts for a second set time, the alarm device is started, and the refrigeration system keeps normal operation; and when the ozone concentration is detected to be less than or equal to the ozone concentration recovery value and lasts for the third set time, the alarm device is closed.
Furthermore, a water collecting tray for receiving condensed water is arranged below the evaporator.
Furthermore, an electric heating module is arranged in the refrigerating air duct.
Furthermore, the controller comprises a compressor exhaust temperature overhigh protection module, a low-voltage protection module, a high-voltage protection module, a current protection module, an operation protection module and a system defrosting protection module;
an evaporator temperature sensor for detecting the evaporation temperature is arranged near the evaporator, in the system defrosting protection module, when the evaporation temperature is lower than the defrosting set temperature, the compressor and the outer fan are stopped, the inner fan is operated, and when the evaporation temperature is higher than the defrosting recovery temperature, the compressor and the outer fan are started;
in the operation protection module, the shortest operation time of the compressor is set, and the compressor can be stopped after the shortest operation time of the compressor is at least passed after the compressor is started; and setting the shortest shutdown time of the compressor, and restarting the compressor after the shortest shutdown time of the compressor is at least passed after the compressor is shut down.
Has the advantages that:
(1) the overhead type electric cabinet environment control method and system mainly adjust the environment in the electric cabinet, mainly adjust the temperature and humidity in the cabinet, and ensure that the environmental parameters of the electric cabinet are within a reasonable range;
(2) the air inlet of the evaporator in the cabinet is provided with a temperature and humidity sensor and an ozone sensor, the temperature and humidity sensor is also arranged outside the cabinet, the internal and external dew points of the cabinet are calculated in real time, the time for dehumidification, refrigeration and standby (the temperature and humidity meet the requirements) is judged through a specific control algorithm and is automatically switched, the internal and external environments of the cabinet are continuously monitored in a standby mode, the external condensation temperature caused by too low temperature in the cabinet can be avoided, and the risk of condensed water to the electric cabinet is further reduced;
(3) meanwhile, when the components in the electric cabinet are aged or the internal environment is not suitable, the high-voltage discharge phenomenon is easy to generate ozone, the ozone concentration in the cabinet can be detected, the operation condition in the cabinet is monitored, and an alarm is provided in time;
(4) an electric heating module is also arranged in the electric cabinet. The temperature and humidity in the electric cabinet are controlled more accurately, the opening and closing conditions of electric heating are judged through a control algorithm, air after temperature reduction and dehumidification is heated, and the temperature and humidity in the cabinet are controlled in a finer interval;
(5) the overhead electrical cabinet environment control system adopts an integrated structure, or is integrated with an electrical cabinet, can be used for the reconstruction of the existing electrical cabinet, or is integrated in an electrical cabinet product to serve as an environment control sub-module, and has strong applicability.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a first perspective view of an electrical cabinet controlled environmental control system;
FIG. 2 is a second perspective view of the electrical cabinet controlled environmental control system;
FIG. 3 is a cross-sectional view of an electrical cabinet control environment control system;
fig. 4 is an internal structure diagram of the electrical cabinet control environment control system.
The device comprises a cabinet, an installation cabinet, an air inlet, an air outlet, a refrigerating air channel, a cooling air channel, an air outlet, an air inlet, a refrigerating air channel, an evaporator, a condenser and a water collecting disc, wherein the cabinet is installed 1, the air inlet is 11, the air inlet is 12, the air outlet is 13, the refrigerating air channel is.
Detailed Description
An overhead electrical cabinet environment control method comprises a refrigeration mode and comprises the following steps:
s01: setting a set temperature in the cabinet, detecting the actual temperature, the ambient temperature and the ambient humidity in the cabinet, and calculating the ambient dew point temperature according to the ambient temperature and the ambient humidity;
s02: comparing the set temperature in the cabinet with the environmental dew point temperature, and calculating the target temperature in the cabinet according to the comparison result:
s21: if the ambient dew point temperature plus the first set difference is greater than the set temperature in the cabinet, the target temperature in the cabinet is the ambient dew point temperature plus the first set difference;
s22: and if the ambient dew point temperature plus the first set difference is less than or equal to the set temperature in the cabinet, the target temperature in the cabinet is equal to the set temperature in the cabinet. Wherein the first set difference is an artificially set temperature difference for preventing frequent start and stop, such as 1 ℃.
S03: the temperature control method comprises the following steps:
when the actual temperature in the cabinet is higher than the target temperature in the cabinet, refrigerating;
and when the actual temperature in the cabinet is less than or equal to the target temperature in the cabinet, ending the refrigeration.
Also comprises a dehumidification mode, comprising the following steps:
s01: detecting the actual temperature, the humidity and the ambient temperature in the cabinet, and calculating the dew point temperature in the cabinet in real time according to the actual temperature and the humidity in the cabinet;
s02: the humidity control method comprises the following steps:
when the operation lower limit temperature is less than or equal to the actual temperature in the cabinet and less than or equal to the target temperature in the cabinet, and the dew point temperature in the cabinet is greater than or equal to the environmental temperature; dehumidification is carried out, wherein the lower temperature limit of operation is set artificially, such as 0 ℃.
Under the scene with stricter humidity requirement, a forced dehumidification function can be added, and the specific method comprises the following steps:
forcibly entering a dehumidification mode when detecting that the actual humidity in the cabinet is larger than or equal to the upper limit value of the humidity, and recovering to normal logic judgment when the actual humidity in the cabinet is smaller than or equal to the recovery value of the humidity；The upper limit humidity value and the recovery humidity value are both set manually.
When the temperature in the cabinet is higher than the target temperature in the cabinet, the system still only works as the compressor and only changes the mode state, and enters a refrigeration mode when the exit condition is met;
when the actual temperature in the cabinet is less than or equal to the target temperature in the cabinet and the dew point temperature in the cabinet is less than the ambient temperature and a second set difference (such as 1 ℃) is obtained, the system enters a standby mode, the refrigeration and the dehumidification are suspended in the standby mode, and the second set difference is set manually.
Calculation of dew point temperature:
the observation of the dry-wet bulb thermometer is a basic observation item of a meteorological station in China, so that the water vapor pressure in the air can be calculated by the temperature difference of the dry-wet bulb and the atmospheric pressure of the station.
e＝Etw-APh(t-tw) (1)
Wherein e is the vapor pressure (hPa); etw is the saturated vapor pressure of the pure water level corresponding to the wet bulb temperature tw, and when the wet bulb freezes and the temperature of the wet bulb is lower than 0 ℃, the saturated vapor pressure of the pure water level ice surface is obtained; a is a dry-wet coefficient (DEG C-1) which is determined by the type of the dry-wet meter, the ventilation speed and the icing or not of the wet bulb, and the value can be checked from a dry-wet coefficient table; ph is the local station gas pressure (hPa); t is dry bulb temperature (. degree. C.); tw is wet bulb temperature (. degree. C.).
When the humidity is measured by using a wet and dry bulb thermometer, the calculation formula of the relative humidity in the air is as follows:
U＝e/Ew×100％ (2)
in the formula, U is relative humidity (%); e is the water vapour pressure (hPa); ew is the saturated water vapor pressure (hPa) corresponding to the dry bulb temperature t.
Since the dew point temperature is the temperature when the air cooling reaches saturation when the air pressure is constant, when the air cooling reaches saturation, the formula (2) shows that U is 100%, and the vapor pressure e is equal to the saturated vapor pressure Ew, the vapor pressure obtained by the formula (1) is taken as the saturated vapor pressure and is brought into the saturated vapor pressure formula, the temperature obtained by inverse calculation is the dew point temperature, and the saturated vapor pressure and the dew point temperature have a one-to-one correspondence relationship.
A system for implementing the overhead electrical cabinet environment control method comprises a refrigeration system and a controller, wherein the refrigeration system comprises an installation cabinet 1, the installation cabinet 1 is arranged above an electrical cabinet or is integrated with the electrical cabinet as a sub-module, the controller is further included, a compressor 2, an evaporator 3 and a condenser 4 are installed in the installation cabinet 1, a working medium outlet of the condenser 4 is connected with a working medium inlet of the evaporator 3, a working medium outlet of the evaporator 3 is connected with a working medium inlet of the compressor 2, a working medium outlet of the compressor 2 is connected with a working medium inlet of the condenser 4, the installation cabinet 1 is provided with an air inlet 11 and an air outlet 12 which are communicated with the interior of the electrical cabinet, a refrigeration air duct 13 is arranged between the air inlet 11 and the air outlet 12, an internal fan is arranged at the air inlet 11 and/or the air outlet 12, the evaporator 3 is arranged in the refrigeration air, The condensation module consisting of the evaporator 3 and the condenser 4 is completed, wherein dehumidification is realized by condensation of hot air in the electrical cabinet on the evaporator 3. A water collecting tray 5 for receiving condensed water is arranged below the evaporator 3.
The installation cabinet 1 is also provided with a cooling air duct 14, the condenser 4 is arranged at one end of the cooling air duct 14, the installation cabinet 1 is provided with an air opening 15 at the other end of the cooling air duct 14, and an outer fan is arranged at the air opening 15.
In the refrigeration mode, the inner fan, the compressor 2 and the outer fan are all started;
in the dehumidification mode, both the inner fan compressor 2 and the outer fan are started;
in the standby mode, the compressor 2 and the outer fan are closed, the inner fan can be opened for a long time, and the energy-saving mode can be entered according to the following steps: the energy saving mode is judged as follows:
when entering a standby mode, judging the temperature control requirement after the internal fan delays for a first set time (such as 10 seconds), and if the temperature control requirement does not meet the standby mode, starting a refrigeration or dehumidification mode according to logic; if the temperature control device is still in the standby mode, the internal fan stops, and the internal fan is started when the refrigeration or dehumidification mode needs to be started is detected due to real-time judgment of temperature control requirements.
To prevent the condensing pressure from being too low, the external fan control logic is as follows: a condensing temperature sensor for detecting the temperature of the condenser is arranged near the condenser 4, the artificially set temperature of the outer fan is compared with the temperature of the condenser, when the temperature of the condenser is less than or equal to the temperature of the outer fan (artificially set, such as 30 ℃), the outer fan is closed, and when the temperature of the condenser is higher than or equal to the temperature of the outer fan
When the temperature of the external fan is more than or equal to the temperature of the external fan (which is set manually, such as 30 ℃), the external fan is started.
An ozone concentration detection device and an alarm device are arranged in the electrical cabinet, when the ozone concentration is detected to be more than or equal to a set ozone concentration protection value (artificially set, such as 8ppm) and lasts for a second set time (such as 10 seconds), the alarm device is started, and the refrigeration system keeps normal operation; when the ozone concentration is detected to be less than or equal to the ozone concentration recovery value (artificially set, such as 5ppm) and lasts for a third set time (such as 10 seconds), the alarm device is closed.
An electric heating module is also arranged in the refrigerating air duct 13. The temperature and humidity inside the electric cabinet can be controlled more accurately, the opening and closing conditions of electric heating are judged through a control algorithm, air after cooling and dehumidification is heated, and the temperature and humidity in the cabinet are controlled in a more precise interval.
The controller comprises a compressor exhaust temperature overhigh protection module, a low-voltage protection module, a high-voltage protection module, a current protection module, an operation protection module and a system defrosting protection module;
an evaporator temperature sensor for detecting the evaporation temperature is arranged near the evaporator 3, in the system defrosting protection module, when the evaporation temperature is lower than the defrosting set temperature (artificially set), the compressor and the outer fan are stopped, the inner fan is operated, and when the evaporation temperature is higher than the defrosting recovery temperature (artificially set), the compressor and the outer fan are started;
in the operation protection module, the shortest operation time of the compressor is set, and the compressor 2 can be stopped after the shortest operation time of the compressor (manually set) is at least started; the shortest shutdown time of the compressor is set, and the compressor can be restarted after the shortest shutdown time of the compressor (set manually) at least passes after the compressor 2 is shut down.
High-pressure protection of the compressor: the high-pressure switch of the compressor system is detected in real time (if the compressor cannot be started in a shutdown state if an alarm is given), and when the switch is detected to be disconnected for 2 seconds, the compressor is shut down correspondingly, and a 'compressor high pressure' alarm is given. The fault is automatically reset after the switch is closed, and if the fault is not reset within 1 hour after 3 times of occurrence or 10 minutes after occurrence of high-voltage alarm, the corresponding compressor high-voltage locking fault is reported and needs to be manually reset.
Low-pressure protection of the compressor: the low-pressure switch of the compressor system is detected after the time delay (low-pressure detection delay) of the compressor is started, and when the time delay (low-pressure duration) of the switch disconnection is detected, the corresponding compressor is closed, and the low-pressure alarm of the compressor is reported. The fault is automatically reset after the switch is closed, and if the fault is not reset within 1 hour after 3 times of low-voltage alarm or 10 minutes after the low-voltage alarm occurs, the corresponding compressor low-voltage locking fault is reported and the manual reset is needed.
And (3) current protection of the compressor: and (3) delaying for 5 seconds after the compressor is started to detect the current of the compressor: when the current of the compressor is detected to be more than or equal to the compressor overcurrent protection value and lasts for 10 seconds, the compressor and the external fan are stopped, the compressor current overcurrent alarm is reported, and the fault needs to be manually reset; when the current of the compressor is detected to be less than or equal to 0.5A and lasts for 10 seconds, the compressor and the external fan are stopped, the 'compressor current is absent' is reported for alarming, and the fault needs to be manually reset.
The environment control system mainly adjusts the environment in the cabinet for the electric high-low voltage electric cabinet, and mainly adjusts the temperature and humidity in the cabinet; the risk of condensation outside the cabinet can be avoided when the temperature in the cabinet is low; simultaneously, ageing as the inside components and parts of regulator cubicle, or internal environment is unsuitable, easily produce the high-voltage discharge phenomenon and produce ozone, consequently, can detect ozone concentration in the cabinet, operation conditions and in time provide the warning in the monitoring cabinet.
The invention discloses an overhead electrical cabinet environment control system, which integrates a whole set of refrigeration system together and mainly comprises: the system comprises a compressor 2, an evaporator 3, a condenser 4, a throttling device, an inner fan, an outer fan, related sensors and the like. The whole refrigeration system is arranged on the top of the electrical cabinet or integrated with the electrical cabinet as a sub-module, and a refrigeration air duct 13 is arranged at the bottom of the system and connected with the interior of the electrical cabinet. The refrigerant absorbs heat in evaporimeter 3, releases heat in condenser 4, removes the regulator cubicle with the heat in the regulator cubicle outside, realizes the refrigeration cooling function, and the dehumidification principle is: in the case of refrigeration, the surface temperature of the evaporator 3 is lower than the dew point temperature of air in the cabinet, and water vapor condenses, falls into the water collecting tray 5 and is discharged.
The airflow structure is as follows: the inner fan extracts hot air from the electrical cabinet, and the hot air flows through the evaporator 3 to be cooled and dehumidified and then returns to the electrical cabinet to cool the interior of the electrical cabinet; the outer fan cools the condenser 4 by extracting air, and then discharges the air, and the inner air flow and the outer air flow are independent.
Be equipped with temperature sensor, humidity transducer and ozone sensor at air intake 11, also be equipped with temperature sensor, humidity transducer outside the cabinet simultaneously, calculate the inside and outside dew point of cabinet in real time, judge dehumidification, refrigeration and standby (humiture satisfies the requirement) opportunity and automatic switch through specific control algorithm, continuously monitor the inside and outside environment of cabinet under standby mode, the too low cabinet that leads to of temperature in can avoiding the cabinet through the algorithm of special design is outer to be condensed dew temperature, further reduces the risk that the condensate water brought for the regulator cubicle.
The controller adopts remote communication, the communication mode is RS485, and the communication protocol is Modbus RTU.
It should be understood that the above-described specific embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Obvious variations or modifications which are within the spirit of the invention are possible within the scope of the invention.
Claims (10)
1. The environmental control method for the overhead electrical cabinet is characterized by comprising a refrigeration mode and comprising the following steps of:
s01: setting a set temperature in the cabinet, detecting the actual temperature, the ambient temperature and the ambient humidity in the cabinet, and calculating the ambient dew point temperature according to the ambient temperature and the ambient humidity;
s02: comparing the set temperature in the cabinet with the environmental dew point temperature, and calculating the target temperature in the cabinet according to the comparison result:
s21: if the ambient dew point temperature plus the first set difference is greater than the set temperature in the cabinet, the target temperature in the cabinet is the ambient dew point temperature plus the first set difference;
s22: if the environmental dew point temperature plus the first set difference value is less than or equal to the set temperature in the cabinet, the target temperature in the cabinet is equal to the set temperature in the cabinet;
s03: the temperature control method comprises the following steps:
when the actual temperature in the cabinet is higher than the target temperature in the cabinet, refrigerating;
and when the actual temperature in the cabinet is less than or equal to the target temperature in the cabinet, ending the refrigeration.
2. The overhead electrical cabinet environment control method according to claim 1, wherein: also comprises a dehumidification mode, comprising the following steps:
s01: detecting the actual temperature, the humidity and the ambient temperature in the cabinet, and calculating the dew point temperature in the cabinet in real time according to the actual temperature and the humidity in the cabinet;
s02: the humidity control method comprises the following steps:
when the operation lower limit temperature is less than or equal to the actual temperature in the cabinet and less than or equal to the target temperature in the cabinet and the dew point temperature in the cabinet is greater than or equal to the environmental temperature, dehumidifying; (ii) a
The method also comprises a forced dehumidification mode, and the specific method comprises the following steps:
when the actual humidity in the cabinet is detected to be larger than or equal to the upper limit value of the humidity, the dehumidification mode is forcibly entered, and when the actual humidity in the cabinet is smaller than or equal to the humidity recovery value, the refrigeration or dehumidification mode is started according to logic;
when the temperature in the cabinet is higher than the target temperature in the cabinet, entering a refrigeration mode;
when the actual temperature in the cabinet is less than or equal to the target temperature in the cabinet and the dew point temperature in the cabinet is less than the ambient temperature and the temperature is lower than the second set difference value ℃, the system enters a standby mode, and refrigeration and dehumidification are suspended in the standby mode.
3. A system for implementing the environmental control method for the overhead electrical cabinet of claim 2, wherein: the refrigeration system comprises a refrigeration system and a controller, wherein the refrigeration system comprises an installation cabinet (1), a compressor (2), an evaporator (3) and a condenser (4) are installed in the installation cabinet (1), a working medium outlet of the condenser (4) is connected with a working medium inlet of the evaporator (3), a working medium outlet of the evaporator (3) is connected with a working medium inlet of the compressor (2), a working medium outlet of the compressor (2) is connected with a working medium inlet of the condenser (4), the installation cabinet (1) is provided with an air inlet (11) and an air outlet (12) which are communicated with the inside of an electric cabinet, a refrigeration air duct (13) is arranged between the air inlet (11) and the air outlet (12), an inner fan is arranged at the air inlet (11) and/or the air outlet (12), the evaporator (3) is arranged in the refrigeration air duct (13), and refrigeration and dehumidification are realized through the compressor (2), The condensation module consisting of the evaporator (3) and the condenser (4) is completed, wherein dehumidification is realized by condensing hot air in the electrical cabinet on the evaporator (3).
4. The system for implementing the environmental control method for the overhead-type electrical cabinet according to claim 3, wherein: the air conditioner is characterized in that a cooling air duct (14) is further arranged on the installation cabinet (1), the condenser (4) is arranged at one end of the cooling air duct (14), an air port (15) is formed in the other end of the cooling air duct (14) of the installation cabinet (1), and an outer fan is arranged at the air port (15).
5. The system for implementing the environmental control method for the overhead-type electrical cabinet according to claim 4, wherein:
in the refrigeration mode, the inner fan, the compressor (2) and the outer fan are all started;
in the dehumidification mode, the inner fan, the compressor (2) and the outer fan are all started;
in the standby mode, the compressor (2) and the outer fan are closed, and the inner fan is opened or closed: when entering a standby mode, the internal fan delays for a first set time and then judges the temperature control requirement, and if the temperature control requirement does not meet the standby mode, the refrigeration or dehumidification mode is started according to logic; and if the fan is still in the standby mode, stopping the inner fan.
6. The system for implementing the environmental control method for the overhead-type electrical cabinet according to claim 4, wherein: and a condensation temperature sensor for detecting the temperature of the condenser is arranged near the condenser (4), the artificially set temperature of the outer fan is compared with the temperature of the condenser, the outer fan is closed when the temperature of the condenser is less than or equal to the temperature of the outer fan, and the outer fan is opened when the temperature of the condenser is more than or equal to the temperature of the outer fan.
7. The system for implementing the environmental control method for the overhead-type electrical cabinet according to claim 4, wherein: an ozone concentration detection device and an alarm device are arranged in the electrical cabinet, when the ozone concentration is detected to be more than or equal to a set ozone concentration protection value and lasts for a second set time, the alarm device is started, and the refrigeration system keeps normal operation; and when the ozone concentration is detected to be less than or equal to the ozone concentration recovery value and lasts for the third set time, the alarm device is closed.
8. The system for implementing the environmental control method for the overhead-type electrical cabinet according to claim 4, wherein: a water collecting tray (5) for receiving condensed water is arranged below the evaporator (3).
9. The system for implementing the environmental control method for the overhead-type electrical cabinet according to claim 4, wherein: an electric heating module is also arranged in the refrigerating air duct (13).
10. The system for implementing the environmental control method for the overhead-type electrical cabinet according to claim 3, wherein: the controller comprises a compressor exhaust temperature overhigh protection module, a low-voltage protection module, a high-voltage protection module, a current protection module, an operation protection module and a system defrosting protection module;
an evaporator temperature sensor for detecting the evaporation temperature is arranged near the evaporator (3), in the system defrosting protection module, when the evaporation temperature is lower than the defrosting set temperature, the compressor and the outer fan are stopped, the inner fan is operated, and when the evaporation temperature is higher than the defrosting recovery temperature, the compressor and the outer fan are started;
in the operation protection module, the shortest operation time of the compressor is set, and the compressor can be stopped after the shortest operation time of the compressor is at least passed after the compressor (2) is started; and setting the shortest shutdown time of the compressor, and restarting the compressor after the shortest shutdown time of the compressor is at least passed after the compressor (2) is shut down.
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