KR20050017959A - Method and Apparatus for Monitoring and Controlling Temperature and Humidity in Low Temperature Storage House - Google Patents

Abstract

PURPOSE: A method for monitoring and controlling temperature and humidity of a low temperature storage house and a device thereof are provided to regulate the temperature and the humidity of the low temperature storage house optimally by detecting the present temperature and the present humidity and remote-controlling the temperature and the humidity. CONSTITUTION: A temperature and humidity control system(2) includes a temperature sensor(21), a humidity sensor(22), four-channel sensor data receiving units(21a,22a), an A/D(analog to digital) converter(23), a microprocessor(24), a communication unit(25), a power unit(26), a display unit(27), a controller state input unit(28a), an over current and over voltage controller(28), a controller driving data output unit(29a) and a controller(29). The temperature sensor measures the present temperature of the low temperature storage house, and the humidity sensor measures the present humidity of the low temperature storage house. The control system compares the present temperature or humidity with the optimal value, and adjusts the temperature and the humidity to the optimal temperature and the optimal humidity.

Description

Method and Apparatus for Monitoring and Controlling Temperature and Humidity of Cold Storages {Method and Apparatus for Monitoring and Controlling Temperature and Humidity in Low Temperature Storage House}

The present invention relates to a method and apparatus for monitoring and controlling the temperature and humidity of a cold reservoir.

Grains and fruits harvested from farms are generally distributed after being temporarily stored in cold storage. Cold stores need to maintain constant temperature and humidity to maintain their freshness.

Conventional cold storage is controlled by a controller that can only control temperature. Therefore, the conventional low temperature storage room has difficulty in maintaining the freshness of the storage optimally because the humidity is not controlled. In addition, since the controller is located in the cold storage, there is an inconvenience that the user must operate the controller in the cold storage at the time of management or inspection of the cold storage. In other words, conventional cold storage is not humidity controlled and cannot be monitored and controlled remotely.

Accordingly, it is an object of the present invention to provide a method and apparatus for monitoring and controlling the temperature and humidity of a cold store in which humidity as well as temperature can be controlled and remote monitoring and remote control are possible.

In order to achieve the above objects, a method for monitoring and controlling the temperature and humidity of a cold store according to an embodiment of the present invention comprises the steps of: sensing the current temperature of the cold store; Sensing the current humidity of the cold reservoir; Comparing the current temperature with a preset optimum temperature and adjusting the temperature of the cold reservoir until the current temperature reaches the optimum temperature; Comparing the current humidity with a preset optimal humidity and adjusting the humidity of the cold reservoir until the current humidity reaches the optimal humidity.

The temperature and humidity is characterized in that it is monitored and controlled remotely.

An apparatus for monitoring and controlling the temperature and humidity of a cold reservoir according to an embodiment of the present invention includes a cold reservoir; A temperature sensor detecting a current temperature of the cold storage; A humidity sensor for sensing a current humidity of the cold storage; A temperature control system for comparing the current temperature with a preset optimum temperature and adjusting the temperature of the cold reservoir until the current temperature reaches the optimum temperature; And a humidity control system for comparing the current humidity with a preset optimal humidity and adjusting the humidity of the cold storage until the current humidity reaches the optimal humidity.

The temperature and humidity control device of the cold storage is further connected to the temperature control system and the humidity control system in a standard communication manner, further comprising a remote controller for remotely monitoring and controlling the temperature control system and the humidity control system.

The temperature control system includes a compressor for pumping and compressing a refrigerant; A condenser for liquefying refrigerant from the compressor; An evaporator for inducing evaporation of the liquid liquefied by the condenser to lower heat in the cold reservoir; An electrically controlled solenoid valve for opening and closing the pipeline; A defroster is provided to remove frost formed on the evaporator.

The humidity control system includes a water pump for supplying humidified water; A foaming material for foaming the humidifying water; It is provided with a moisture generator for inducing evaporation of the water bubbled in the foam material to supply the fine moisture to the cold storage.

Other objects and features of the present invention in addition to the above object will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 1 to 11.

Referring to FIG. 1, a temperature and humidity control apparatus for a cold storage according to an embodiment of the present invention includes a control system 2 for monitoring and controlling the temperature and humidity of the storage 1 and a control system through a standard communication method. A personal computer (hereinafter referred to as "PC") 30 connected to (2) is provided.

In the cellar 1, various crops harvested by the farmhouse are stored, and the internal temperature is approximately -50 under the control of the control system 2 in consideration of the optimal storage condition according to the type of each crop in order to maintain the freshness of the crop. The temperature is kept constant at a predetermined temperature within the range of 0 ° C. to + 50 ° C., and the internal humidity is kept constant at a predetermined humidity within approximately 0% to 100%.

The control system 2 controls the temperature / humidity controller according to data such as temperature / humidity setting data, defrost time data, delay time, etc. input from the user and displays the current state of temperature and humidity in the storage. In addition, the control system 2 controls the temperature / humidity controller according to data such as temperature / humidity setting data, defrost time data, delay time, etc. received from the remote PC 30, and controls the temperature and humidity in the storage 1. The current state of the is transmitted to the PC 30. Here, the temperature setting data is data corresponding to a temperature within -50 ° C to + 50 ° C as an optimum temperature in the storage 1. The humidity setting data is data corresponding to the optimum humidity in the storage 1. The defrost time data is the drive time data of the defrost heater for removing frost formed in the temperature controller controlled by the control system 2. For example, the defrost time data is time data for driving the defrost heater for about 10 to 30 minutes in a 6 hour period. The delay time is time data of about 20 seconds to 3 minutes as the time data for temporarily stopping the temperature controller after the defrost time.

The PC 30 is located remotely from the storage 1 and displays data from the control system 2 so that the user can know the current temperature and humidity of the storage 1 remotely and can be changed by the user. Data such as temperature / humidity setting data, defrost time data, delay time, and the like are transmitted to the control system 2.

In order to enable bi-directional communication between the control system 2 and the PC 30, data is transmitted / received between the control system 2 and the PC 30 in an RS-485 communication method based on RS-232C. do. RS-485 can communicate at speeds up to 10 [Mbps], communicate with up to 30 control systems (2) with one PC (30), and with a PC (30) at distances of up to 400 feet. Enable communication between the control system 2.

2 shows the configuration of the control system 2 in detail.

2 shows that the control system 2 includes a temperature sensor 21, a humidity sensor 22, two four-channel sensor data receivers 21a, 22a, an analog-to-digital converter (hereinafter referred to as "A /") installed in the reservoir 1. D converter ") 23, microprocessor 24, communication unit 25, power supply unit 26, display unit 27, controller state input unit 28a, overcurrent / overvoltage controller 28, controller unit drive The data output unit 29a and the controller 29 are provided.

One or more temperature sensors 21 may be installed in the storage 1, and the A / D converter 23 may detect the temperature in the storage and transmit the detected temperature signal through the 4-channel sensor data receiver 21a. To feed. The temperature sensor 21 may be any temperature sensor known in the art, for example, a platinum resistance temperature sensor pt100Ω. The four-channel sensor data receiver 21a may supply temperature signals respectively input from the maximum four temperature sensors 21 to the A / D converter 23. Therefore, when the four channel sensor data receiver 21a is used, up to four temperature sensors 21 may be installed at different positions in one storage 1.

One or more humidity sensors 22 may be installed in the storage 1 and up to 4, and the A / D converter 23 detects the humidity in the storage and transmits the detected temperature signal through the 4-channel sensor data receiver 22a. To feed. The humidity sensor 22 may be any humidity sensor known in the art, for example, a humidity sensor of the HIH-3610 series. The four-channel sensor data receiver 22a may supply the humidity signals respectively input from the four humidity sensors 22 to the A / D converter 23. Therefore, when the four-channel sensor data receiver 22a is used, up to four humidity sensors 21 may be installed at different positions in one storage 1.

The A / D converter 23 converts each of the analog temperature signal input from the temperature sensor 21 and the analog humidity signal input from the humidity sensor 22 into digital data and supplies the digital data to the microprocessor 24.

The microprocessor 24 controls the controller according to the remote data inputted from the communication unit 25 or the temperature / humidity data inputted from the A / D converter 23 to maintain the optimum temperature and humidity in the storage 1. Let's do it. The microprocessor 24 may be implemented as any microprocessor known in the art, for example, a microprocessor of the AVR chip series. In the AVR chip series, the ATmega103 does not need an A / D converter 23 because it has a built-in A / D converter.

The communication unit 25 adopts a standard communication method, for example, a RS485 standard communication method, and transmits data such as temperature / humidity setting data, defrost time data, delay time, and the like input from the PC 30 to the microprocessor 24. The temperature / humidity data from the microprocessor 24 is transferred to the PC 30.

The power supply unit 26 converts an AC commercial power supply 220 [V] from the outside into a microprocessor power supply voltage 5 [V] and in response to a 5 [V] control signal of the microprocessor 24, for example, a digital relay voltage converter. The contact of RY 5W-K is turned on / off to intercept 220 [V] supplied to the controller 29.

The display unit 27 displays temperature / humidity data input from the microprocessor 24.

The control system 2 further includes a data input unit 31 and a memory (not shown). The data input unit 31 is provided on the control system 2 to supply the microprocessor 24 with data such as temperature / humidity setting data, defrost time data, delay time, and the like input from the user. The data input unit 31 may be implemented by any known public input means such as a push button, a keypad, a keyboard, a touch panel, and the like. The memory includes a working RAM in which data is temporarily stored under the control of the microprocessor 24, and a ROM in which a program for executing various procedures of temperature / humidity monitoring and control under the control of the microprocessor 24 is embedded.

The overcurrent / overvoltage controller 28 cuts off the controller status signal that may be generated by the controller 29 or the overcurrent / overvoltage of an external power source, corrects an error component, and outputs the controller status signal to the controller status input unit 28a. The controller 29 and the microprocessor 24 are protected from overcurrent / overvoltage by supplying the microprocessor 24 through the microprocessor 24. This overcurrent / overvoltage controller 28 can be implemented in any known public. The controller state signal is a signal indicating a driving state of various devices included in the controller 29.

The controller 29 includes a temperature controller for regulating temperature and a humidity controller for regulating humidity. The temperature controller includes a compressor, a condenser, an evaporator, a solenoid valve, a defrost heater, a drain heater, and the like. The humidity controller includes a water pump, a water generator, and the like.

The microprocessor 24 supplies a drive signal generated according to the temperature / humidity setting data, the defrost time data, and the delay time data to the controller 29 through the controller drive data output unit 29a.

This control system 2 can in turn be divided into a temperature control system and a humidity control system.

The temperature control system is divided into water-cooled and air-cooled according to the method of condensing the refrigerant. The water-cooled method is a method of lowering the temperature of a condenser with water, but the cooling effect is excellent, but since the fluid is used, piping is required, and when the pipe is a metal pipe, rust may easily occur, and thus has a short lifespan. The air-cooled method is a method of cooling by using an endothermic reaction by blowing with a fan (Fan), and has a simple structure and strong corrosion resistance compared to water-cooled. The temperature control system of the present invention is implemented in an air-cooled method in consideration of economics and applicability. Of course, the temperature control system of the present invention may be implemented in a water-cooled method.

3 shows a temperature control system according to an embodiment of the invention.

Referring to FIG. 3, a temperature control system according to an embodiment of the present invention includes a microprocessor 24, a voltage converter 33, a temperature controller 32, a storage 1, a temperature sensor 21, and an A / D. The converter 23 is provided.

In the temperature control system, when a user inputs temperature setting data to the microprocessor 24 through the data input unit 31 or the communication unit 25, the microprocessor 24 causes the current temperature of the storage 1 to be higher than the set temperature. In this case, the temperature controller 32 is operated through the voltage converter 33 to lower the internal temperature of the storage 1 so as to match the preset temperature according to the temperature setting data. In other words, the temperature control system of the present invention measures the current temperature of the reservoir 1 via the temperature sensor 21 and supplies the temperature measurement value to the microprocessor 24 via A / D conversion. The microprocessor 24 compares the preset optimal temperature with the present temperature in the reservoir 1 and controls the temperature in the reservoir 1 to converge to a target value, that is, the optimum temperature.

Referring to the functional effects due to the function and the combination of the components for each of the components included in the temperature control system of the present invention are as follows.

The microprocessor 24 compares the preset optimum temperature with the present temperature in the storage 1 sensed by the temperature sensor 21 and if the present temperature is higher than the set temperature, the temperature controller 32 via the voltage converter 33. ) To lower the temperature in the reservoir (1). The microprocessor 24 stops the temperature controller 32 by opening the relay contact of the voltage converter 33 when the current temperature in the reservoir 1 is equal to the preset temperature.

The voltage converter 33 converts the power supply voltage 5 [V] of the microprocessor 24 into a drive voltage of the temperature controller 32. To this end, the voltage converter 33 supplies a driving voltage to the temperature controller 32 by turning on / off a relay connected between the commercial AC power supply and the temperature controller 32 in response to the control signal of the microprocessor 24. The driving voltage is cut off. This voltage converter 33 may be implemented as RY 5W-K as described above as a V / V converter.

The temperature controller 32 is an air-cooled temperature controller as described above and includes a compressor, a condenser, an evaporator, a solenoid valve, a defrost heater, a drain heater, and the like, each of which is driven by a driving voltage supplied from the voltage converter 31. do.

Description of the temperature sensor 21 and the A / D converter 23 is the same as described above will be omitted.

4 shows an example of the temperature controller 32.

Referring to FIG. 4, the temperature controller 32 includes a compressor 41, flexible tubes 42a and 42b, an oil separator 43, a condenser 44, and a receiver. (45), Filter (46), Transparent Tube (47), Shut-off Valve (48), Solenoid Valve (49), Expansion Valve (50) And an evaporator 51 and an accumulator 52.

The temperature controller 32 circulates the refrigerant using the compressor 41. The refrigerant circulated in this way is first passed through the oil separator 43, the mixed oil component is removed and liquefied by the condenser 44. In the liquefied refrigerant, gaseous refrigerant is mixed, so that the refrigerant liquefied by passing through the condenser 44 is removed by the receiver 45, and only the remaining liquefied refrigerant is the filter 46, the transparent tube 47, It is supplied to the expansion valve 50 and the evaporator 51 via the shutoff valve 48, the solenoid valve 49, etc., and is expanded and vaporized by the expansion valve 50 and the evaporator 51. The ambient air cooled by the endothermic reaction when it is expanded and vaporized is dispersed into the reservoir 1 by the fan. The refrigerant vaporized in the evaporator 51 is recovered to the liquid separator 52 and the liquid refrigerant is separated by the liquid separator 52. The gaseous refrigerant from the liquid separator 52 is supplied to the compressor 41.

The compressor 41, the condenser 44, the evaporator 51, the solenoid valve 49, and the like are driven by the drive voltage from the voltage converter 33 controlled by the microprocessor 24.

Referring to the functional effects due to the function and the combination of the components for each component included in the temperature controller of the present invention are as follows.

The compressor 41 pumps and compresses the gas refrigerant sucked from the liquid separator 52 via the buffer valve 42b. This compressor 41 is an outdoor unit installed outside the storage.

The buffer valves 42a and 42b are respectively connected to the suction pipe and the discharge pipe of the compressor 41 to absorb vibrations or disturbances caused by the pumping action of the compressor 41 to prevent damage to the surrounding pipes and peripheral devices. To this end, the buffer valves 42a and 42b are made of a flexible resin tube.

The oil separator 43 separates the liquid refrigerant mixed into the gas refrigerant supplied from the compressor 41 via the buffer valve 42a by using a specific gravity difference and supplies only the gas refrigerant to the condenser 32. This is because in the process of compressing the gas refrigerant to the saturation pressure in the compressor 41, the gas refrigerant (R22-freon) and the oil of the cylinder installed in the compressor 41 may be mixed and introduced into the pipe.

The condenser 44 liquefies by generating a high temperature and high pressure gas refrigerant supplied from the oil separator 43. To this end, the condenser 44 cools the pipe through which the refrigerant flows with the fan 44a. This condenser 44 is an outdoor unit installed outside the storage 1.

The receiver 45 stores the liquid refrigerant of high temperature and high pressure supplied from the condenser 44 and extracts only the liquid refrigerant using specific gravity differences because gas is included in the refrigerant liquefied by the condenser 44. That is, the liquid sinks in the lower part of the receiver 45 and the gas is positioned in the upper part, and the discharge pipe of the receiver 45 is located in the lower part so that only the liquid refrigerant is extracted.

The filter 46 removes the water and the foreign matter mixed in the liquid refrigerant by allowing the liquid refrigerant supplied from the receiver 45 to pass through the silica gel.

The transparent tube 47 allows the user to visually check the liquid refrigerant and the water-containing state proceeding toward the evaporator 51. For this purpose, the transparent tube 47 is attached to a part of the tube.

The shutoff valve 48 is a manual valve and is used to prevent refrigerant leakage during repair of the temperature controller 32.

The solenoid valve 49 is a valve for forming or blocking a flow path of the liquid refrigerant in response to an electrical signal, and shuts off the flow path of the liquid refrigerant during a period in which the temperature in the reservoir reaches the set temperature and maintains the set temperature. At this time, when the pipe is blocked and the pressure of the pipe drops, a low pressure switch (LP), which is one of the dual pressure switches (DPS) (not shown) is driven to operate the compressor (41), the condenser (44) and The evaporator 51 is stopped.

The expansion valve 50 is a valve for reducing the pressure of the high-pressure liquid refrigerant liquefied by the condenser 44 to a pressure that can cause evaporation by a clamping action.

The evaporator 51 is decompressed through the expansion valve 50 to induce the evaporation of the liquid to a low temperature to absorb the ambient temperature, that is, the heat in the reservoir (1) to lower the temperature in the reservoir (1). To this end, the evaporator 51 is an indoor unit provided with a fan 51a and installed in the reservoir 1. The evaporator 51 further includes a defrost heater 51b, a drain pipe 51c, and a drain heater 51d. The defrost heater 51b heats the evaporator 51 for a predetermined defrost time under the control of the microprocessor 24 to remove frost formed on the evaporator 51. The frost is discharged through the drain pipe 51c generated while melting. The drain heater 51d heats the drain tube 51c under the control of the microprocessor 24 to prevent frost from forming on the drain tube 51c or freezing the drain tube 51c.

The liquid separator 52 separates the liquid contained in the gas refrigerant from the evaporator 51 by using a specific gravity difference. This is because the liquid refrigerant does not evaporate 100 [%] in the evaporator 51 but evaporates to approximately 80 to 90 [%], and therefore, about 10 to 20 [%] of liquid refrigerant is mixed with the gas refrigerant even after evaporation. If the refrigerant is compressed by the compressor 41 in a state where the liquid refrigerant is contained before compressing the refrigerant to a high pressure, the liquid may work with the high pressure to cause a liquid hammer phenomenon to damage the components in the compressor 41.

The temperature controller 32 further includes a thermostat (not shown). A thermostat is a sphere that senses temperature and is filled with gas. The thermostat is connected to the expansion valve 50 by a capillary tube (not shown), and is attached to 45 degrees on the upper portion of the copper tube at the end of evaporation. The thermostat senses the refrigerant temperature and automatically adjusts the diameter of the orifice of the expansion valve 50. This is because the degree of expansion of the gas inside the thermostat varies depending on the temperature of the refrigerant.

Under the control of the microprocessor 24, only the defrost heater 51b and the drain heater 51d are driven during the defrost time, and the compressor 41, the condenser 44, the evaporator 51, and the like are stopped. The defrost heater 51b, the drain heater 51d, the compressor 41, the condenser 44, the evaporator 51, and the like temporarily stop under the control of the microprocessor 24 for a predetermined delay time following the defrost time. .

5 shows a humidity control system according to an embodiment of the present invention.

Referring to Figure 5, the humidity control system according to an embodiment of the present invention is a microprocessor 24, voltage converter 53, humidifier 54, storage 1, humidity sensor 22 and A / D converter 23 is provided.

In the humidity control system, when a user inputs humidity setting data to the microprocessor 24 through the data input unit 31 or the communication unit 25, the microprocessor 24 causes the current humidity of the storage 1 to be lower than the set humidity. In this case, the humidifier is driven through the voltage converter 53 to increase the internal humidity of the storage 1 so as to match the preset optimal humidity according to the humidity setting data. In other words, the humidity control system of the present invention measures the current humidity of the storage 1 through the humidity sensor 22 and supplies the humidity measurement value to the microprocessor 24 through A / D conversion. The microprocessor 24 compares the preset humidity with the current humidity in the storage 1 and controls the humidity in the storage 1 to converge to a target value.

Referring to the functional effects due to the function and the combination of the components for each of the components included in the temperature control system of the present invention are as follows.

The microprocessor 24 compares the preset optimal humidity with the current humidity in the storage 1 sensed by the humidity sensor 22, and if it is determined that the current humidity is lower than the set optimal humidity, the humidifier through the voltage converter 53. Drive 54 to increase the humidity in the reservoir 1. The microprocessor 24 stops the humidifier 54 by opening a relay contact of the voltage converter 53 when the current humidity in the reservoir 1 is equal to a predetermined optimum humidity.

The voltage converter 53 converts the power supply voltage 5 [V] of the microprocessor 24 into the drive voltage of the humidifier 54. To this end, the voltage converter 53 turns on / off a relay connected between the commercial AC power supply and the humidifier 54 in response to the control signal of the microprocessor 24 to supply a drive voltage to the humidifier 54 or drive the drive. Shut off the voltage. This voltage converter 53 may be implemented with RY 5W-K.

The humidifier 54 is a device for supplying moisture to the storage 1 to increase the humidity in the storage 1 and is implemented as shown in FIGS. 6 and 7 and is driven by a driving voltage supplied from the voltage converter 53.

Since the description of the humidity sensor 22 and the A / D converter 23 is the same as described above, a description thereof will be omitted.

6 shows an example of the humidifier 54.

Referring to FIG. 6, the humidifier 54 includes a water pump 61, a solenoid valve 65, and a water generator 62.

The humidifier 54 supplies fine moisture into the reservoir 1 by a natural humidification method that generates moisture using moisture and wind.

The water pump 61 pumps and circulates the humidifying water.

The solenoid valve 65 serves to regulate the amount of humidified water supplied to the conduit under the control of the microprocessor 24.

The moisture generator 62 blows the humidifying water into the fan 62a to generate fine moisture, and supplies the fine moisture into the reservoir 1. For natural humidification, the moisture generator 62 further includes a humidity absorbing material 66 for foaming humidifying water supplied from the water pump 61 as shown in FIG. 7. The humidified water vaporized in the moisture absorbent 66 is evaporated to fine moisture by the rotation of the fan 62a, and the fine moisture increases the humidity in the storage 1. The moisture absorbent 66 may be formed of, for example, a sponge as a resin material having an absorbent porous structure.

Factors that determine the degree of humidification are the rotational speed of the fan 62a and the amount of humidifying water. The rotation speed of the fan 62a is controlled by the control of the magnetic contactor 63. In other words, the magnetic contactor 63 is included in the voltage converter 53 of FIG. 5 to control the rotational speed of the fan 62a by controlling the commercial AC voltage under the control of the microprocessor 24. The amount of humidifying water supply is controlled by the solenoid valve 65 as described above.

8 shows the voltage converters 33 and 53 in detail.

Referring to FIG. 8, the voltage converters 33 and 53 are a photo-coupler 81, a current amplifier 82, a DC to AC converter (hereinafter, referred to as a “DC / AC converter”). 83) and a magnetic contactor 84.

The voltage converters 33 and 53 have a voltage and current of 5 [V] / 4 [mA] respectively output from the microprocessor 24 for each I / O port, so that the voltage and current are humidified with the temperature controller 32. It serves to convert an output voltage of 220 [V] capable of operating the device 54.

In this power converter 33, 53, a photo coupler 81 is used to insulate the microprocessor 24 and the temperature controller / humidifier 54, 54.

The photo coupler 81 transmits a low voltage control signal from the microprocessor 24 to light to electrically insulate the microprocessor from the current amplifier 82 to improve the stability and electrical insulation of the system.

The current amplifier 82 amplifies the output current of the microprocessor 24 to a current level suitable for driving the DC / AC converter 83. To this end, the current amplifier 82 amplifies the current by turning on / off the driving current of the DC / AC converter 83 using a transistor, for example, a 2N2222 switching transistor. The NPN switching transistor, the 2N2222A, draws 800mA and operates at low voltages. This transistor is used in linear amplifiers and switching circuits.

The DC / AC converter 83 converts a DC voltage of 5 [V] into an AC voltage of 220 [V]. To this end, the DC / AC converter 83 uses a RY 5WK relay for intermittent commercial AC power in response to a DC voltage of 5 [V].

The magnetic contactor 84 amplifies the current of the 220 [V] / 1 [A] power supplied from the DC / AC converter 83, converts it into the driving power of 220 [V] / 30 [A], and the driving power. Is supplied to the temperature controller 32 and the humidifier 54.

On the other hand, there are contact point control and pointless point control as a method of controlling the strong electric current by receiving the weak electric power. Spot contact control is used for relay switch control and pointless control is used for diode, transistor, and digital integrated circuit control. This control method is characterized by long mechanical life, high reliability, and strong vibration because of no mechanical moving parts. The present invention utilizes the I / O output of the microprocessor 24 to provide a temperature controller 32 and a humidifier 54 with a rating of 220 [V] / 30 [A] as described above. It is driven by the contact point mixing method.

9 is a flowchart illustrating a control procedure of a method for controlling a temperature of a cold storage according to an embodiment of the present invention step by step.

9, the temperature control method according to an embodiment of the present invention in order to drive the compressor 41 and the temperature sensor 21 in the initial state (INT Power), the temperature sensor controller ( Turn on the power of T / C) and turn on the power lamp to let the user know that the power is supplied. (Step S91) The overcurrent / overvoltage controller 28 is an external power or temperature controller. It is determined whether there is an overcurrent / overvoltage in the signal or power supplied from (32). (Step S92) If there is no overcurrent / overvoltage in step S92, the drain heater 'DH' 51d and an alarm lamp are driven. In step S93), when overcurrent / overvoltage is detected in step S92, the overcurrent / overvoltage is removed to stabilize the signal or power supplied from the external power source or the temperature controller 32, and the step S91 is performed again (step S94). 24 timers The operation time of the temperature controller 32 is monitored by monitoring the count value of the timer (step S95) to determine whether the operation time reaches the defrost time (step S96). If it is determined that time has not been reached, the microprocessor 24 determines whether the current temperature in the reservoir 1 detected by the temperature sensor 21 reaches a preset optimum temperature. If the temperature does not reach the optimum temperature, the solenoid valve 'SV' 49 is opened (step S98), and the magnetic contactor 'HM' 84 and the crank case heater (CCH) for defrosting are turned off. On the other hand, the compressor 'Comp' 41, the condenser 'CFM' 44, the evaporator 'EV Fan' 51 are driven and the oil pressure switch (OPS) of the compressor 41 is turned on. Oil is supplied to the cylinder of 41 to lower the temperature in the reservoir 1 (step S99).

When the current temperature reaches the optimum temperature in step S97, the solenoid valve 'SV' (49) is closed (step S100) and the compressor 'Comp' 41, the condenser 'CFM' 44 and the oil pressure switch 'OPS' While stopping the drive, the crankcase heater 'CCH' and the evaporator 'EV Fan' are driven (step S101).

When the defrost time is reached in step S96, the solenoid valve 49 is closed (S102), the compressor 'Comp' (41), the condenser 'CFM' (44), the evaporator 'EV Fan' (51), and the oil pressure switch 'OPS' While the driving of the motor is stopped, the magnetic contactor 'HM' 84 for defrosting and the crankcase heater 'CCH' are driven to defrost and to turn on the heater lamp for indicating that defrost is in progress. The controller 32 is defrosted for a predetermined time under the control of the microprocessor 24, waits for a predetermined delay time, and restarts after the delay time has elapsed (step S104).

If the user does not turn off the power using the manual switch, the process is performed again in step S92 (step S105).

10 is a flowchart illustrating a control procedure of a method for controlling humidity of a low temperature storage room according to an embodiment of the present invention.

Referring to FIG. 10, in the humidity control method according to an exemplary embodiment of the present invention, the overcurrent / overvoltage controller 28 determines whether there is an overcurrent / overvoltage in a signal or power supplied from an external power source or the humidifier 54. In step S111, if there is no overcurrent / overvoltage in step S111, the microprocessor 24 determines whether the operation elapsed time reaches the defrost time. The signal or power supplied from the external power source or the humidifier 54 is stabilized and the operation S111 is performed again. (Step S94) When the operation time is determined in step S112 that the defrosting time has not yet been reached, the microprocessor 24 determines the humidity. It is determined whether the current humidity in the storage 1 sensed by the sensor 22 reaches a preset optimal humidity. (Step S114) The current humidity in step S114. If the optimum humidity is not reached, the microprocessor 24 drives the water pump 61 and the water generator 62 to increase the humidity of the reservoir 1 by supplying fine moisture into the reservoir 1 (step S115). If the defrosting time is reached in step S112 or it is determined in step S114 that the current humidity of the reservoir 1 does not reach the preset optimum humidity, the microprocessor 24 stops the water pump 61 and the water generator 62. (Step S116)

If the user does not turn off the power using the manual switch, the process is performed again in step S111 (step S117).

On the other hand, when one boundary value for determining the operation of temperature or humidity is used, the operation of the temperature controller 32 or the humidifier 54 may be chattered by frequent changes in temperature and humidity. Can be. In order to prevent this, the temperature and humidity control method and apparatus of the cold storage according to the present invention widen the allowable margin of operation as shown in FIG. The dead zone for the microprocessor 24 is set. In this dead zone, the temperature controller 32 or the humidifier 54 maintains its current operation. An upper limit threshold th-H is set between the dead zone and the operation section, and a lower limit threshold th-L is set between the dead zone and the stop section. For example, assuming that the reference temperature of the optimum temperature is 1 ° C, the upper limit threshold (th-H) may be set to 2 ° C as + 1 ° C of the reference temperature, and the lower limit threshold (th-L) is the reference temperature. Can be set to 0 ° C as -1 ° C. Assuming these temperature conditions, the dead zone is set to a temperature range between 0 ° C and 2 ° C. When the present temperature in the reservoir 1 exceeds the upper limit threshold th-H, the microprocessor 24 drives the temperature controller 32 while the current temperature is higher than the lower limit threshold th-L. The temperature controller 32 is stopped when it is lowered. When the current humidity in the reservoir 1 exceeds the upper limit threshold th-H, the microprocessor 24 stops the humidifier 54 while the current humidity is higher than the lower limit threshold th-L. When lowered, the temperature controller 32 is driven.

As described above, the method and apparatus for monitoring and controlling the temperature and humidity of the cold storage according to the present invention is capable of monitoring and adjusting the humidity as well as the temperature of the cold storage and is based on the PC temperature and humidity Can be monitored and controlled.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

1 is a block diagram schematically showing an apparatus for controlling temperature and humidity of a cold storage according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating in detail the control system illustrated in FIG. 1.

3 is a block diagram illustrating a temperature control system according to an exemplary embodiment of the present invention.

4 is a view showing in detail the temperature controller shown in FIG.

5 is a block diagram illustrating a humidity control system according to an exemplary embodiment of the present invention.

6 is a view showing in detail the humidifier shown in FIG.

7 is a view showing in detail the water generator shown in FIG.

FIG. 8 is a detailed block diagram illustrating the voltage converter illustrated in FIGS. 3 and 5.

9 is a flowchart illustrating a control procedure of a method for controlling a temperature of a cold storage according to an embodiment of the present invention step by step.

10 is a flowchart illustrating a control procedure of a method for controlling humidity of a low temperature storage room according to an embodiment of the present invention.

11 is a graph for explaining a dead zone set in a microprocessor.

<Description of Symbols for Main Parts of Drawings>

1: storage 2: control system

21: temperature sensor 22: humidity sensor

23: A / D converter 24: microprocessor

25: communication unit 26: power unit

27: display unit 28: overcurrent / overvoltage controller

29: controller 30: PC

31: data input unit 32: temperature controller

33, 53: voltage converter 41: compressor

42a, 42b: buffer valve 43: oil separator

44: condenser 45: receiver

46 filter 47 transparent tube

48: shut off valve 49, 65: solenoid valve

50 expansion valve 51 evaporator

52: liquid separator 54: humidifier

61: water pump 62: water generator

66: foaming material 81: photocoupler

82: current amplifier 83: DC / AC converter

84: magnetic contactor

Claims (5)

Sensing the current temperature of the cold store; Sensing the current humidity of the cold reservoir; Comparing the current temperature with a preset optimum temperature and adjusting the temperature of the cold reservoir until the current temperature reaches the optimum temperature; Comparing the current humidity with a preset optimum humidity and adjusting the humidity of the cold storage until the current humidity reaches the optimum humidity. Way. The method of claim 1, The temperature and humidity are monitored and controlled at a remote location through a standard communication with a personal computer (PC). Cold storage; A temperature sensor detecting a current temperature of the cold storage; A humidity sensor for sensing a current humidity of the cold storage; A temperature control system for comparing the current temperature with a preset optimum temperature and adjusting the temperature of the cold reservoir until the current temperature reaches the optimum temperature; And a humidity control system for comparing the current humidity with a preset optimum humidity and adjusting the humidity of the cold storage until the current humidity reaches the optimum humidity. Device for control. The method of claim 3, wherein And a remote controller connected to the temperature control system and the humidity control system in a standard communication manner to remotely monitor and control the temperature control system and the humidity control system. Device for monitoring and control. The method of claim 3, wherein The temperature control system includes a compressor for pumping and compressing a refrigerant; A condenser for liquefying refrigerant from the compressor; An evaporator for inducing evaporation of the liquid liquefied by the condenser to lower heat in the cold reservoir; An electrically controlled solenoid valve for opening and closing the pipeline; And a defroster for removing frost formed on the evaporator, The humidity control system, A water pump for supplying humidification water; A foaming material for foaming the humidifying water; Apparatus for monitoring and control the temperature and humidity of the cold reservoir, characterized in that it comprises a water generator for inducing evaporation of the water vaporized in the foam material to supply the fine moisture to the cold reservoir.