KR20190096580A - Freshness maintaining device of sensor based low temperature warehouse and control method thereof - Google Patents

Abstract

The present invention relates to a freshness maintaining device for a sensor-based low temperature warehouse and a control method for the same. The freshness maintaining device is to maintain an optimal product storage state by sterilizing preserved food of a low temperature warehouse and removing the odor generated from the preserved food. According to the present invention, the freshness maintaining device includes: a step of shutting off operation of an ozone generator by a control unit while the control unit displays a concentration value of ozone in a current low temperature warehouse when a temporary entry button is selected, and of urgently discharging residual ozone in the low temperature warehouse; a step of determining information on the number of people in the current low temperature warehouse; a step of displaying a warning state by flickering when people remain in the low temperature warehouse when a door is closed, and also, of urgently calling an administrator using a wireless network when a predetermined time passes after the flickering; a step of raising the concentration of ozone in the low temperature warehouse when no people remain in the low temperature warehouse when the door is closed; a step of shutting off the operation of the ozone generator when the concentration of the ozone reaches a set value and detecting the gas with the foul odor in the low temperature warehouse, detected from a gas sensor; and a step of maintaining the ozone state at the high concentration when the gas with a foul odor detected by the gas sensor is equal to or greater than the set value, and also, of determining whether to operate the ozone generator by detecting the concentration of the ozone again when the gas with the foul odor is less than the set value.

Description

Freshness maintaining device of sensor based low temperature warehouse and control method

The present invention relates to a freshness maintaining device and a control method for sterilizing stored foods in a low temperature warehouse and removing odors generated from them to maintain an optimal product storage state. Maintain freshness of sensor-based low-temperature warehouse that performs automatic adjustment of ozone concentration to maintain freshness, controls emergency ventilation for reducing ozone concentration immediately when managers and workers enter and exits, and performs alarm and remote manager emergency call function in case of trouble. An apparatus and a control method thereof are provided.

Generally, storage warehouses are equipped with a cooling system for long-term low-temperature storage of the stored products for safe storage and freshness of various agricultural and livestock products, seafood, food, medicine, liquor, and plant seeds stored in the warehouse. Temperature controllers are provided to select and maintain the optimal storage temperature for each storage product.

In such cold storage, the flow of internal air is very important. If the internal air flow is not smooth, it will be difficult to maintain the freshness of the stored goods for a long time. Therefore, the design of the cold storage warehouse considers the internal air flow a lot.

The air blower is used to smoothly distribute the air in the cold store. At this time, the moisture content of the stored product in the cold store is changed by the wind of the blower, which adversely affects the quality of the stored product.

In particular, when the products stored in the cold storage are fresh foods such as vegetables, seafood or fruits, the temperature in the storage warehouse is not very low, so the growth of various bacteria is high, and various types of odors are caused by the growth of various bacteria. Is easy to occur.

In order to remove the deterioration and odor of the stored goods due to the propagation of bacteria in the storage warehouse, ventilation and sterilization related to the storage quantity of the warehouse should be carried out.In the case of sterilization of the stored goods, the effects on the human body cannot be ignored. If the ventilation is carried out, changes in the humidity and temperature conditions in the warehouse due to the ventilation can lead to the deterioration of the stored goods.

Patent No. 10-1634936 (registration date 2016.06.29) proposes a multi-purpose fruit storage system to keep products in the fruit storage fresh using ozone water.

This prior patented technology not only allows the fruit to be dried or aged as needed while maintaining the desired temperature and humidity while retaining a large amount of harvested fruit, and also prevents fruit from being shed in the long term. In order to provide a multi-purpose fruit storage system that prevents contaminants from being contaminated and maintains freshness to ensure the best commercial quality according to the time when fruits are shipped and distributed, there is a space for storing and storing fruits inside. A formed reservoir, an air conditioner provided inside or outside the reservoir to selectively generate and dissipate hot or cold air into the reservoir, and provided inside or outside the reservoir to suck in air from the outside of the reservoir. To separate the nitrogen into the reservoir The fruit storage system comprises a nitrogen supply unit for supplying a cow, and an air discharge unit provided inside or outside the reservoir to inhale air from the reservoir and discharge it to the outside.

In detail, the nitrogen supply unit includes a nitrogen generator that separates nitrogen from the air sucked from the outside of the reservoir and a nitrogen supply tube that supplies nitrogen generated by the nitrogen generator to the reservoir and an end of the nitrogen supply tube. And a backflow prevention device installed in the reservoir to prevent backflow of air in the reservoir to the nitrogen supply unit, wherein the air discharge unit separates nitrogen from the air in the sucked reservoir and supplies it back into the reservoir. It includes, and configured to include a gas adsorption device for suctioning and removing the harmful gas generated from the fruit stored in the reservoir, wherein the multipurpose fruit storage system is supplied with nitrogen removed gas from the nitrogen supply unit to receive oxygen Oxygen generator for separating and the oxygen generator And an ozone water generating device for receiving ozone from the ozone water generating device and a washing device for receiving the ozone water from the ozone water generating device and washing the fruit introduced into or in the reservoir, wherein the air conditioner includes ozone water. It is configured to include an ozone humidifier that receives the ozone water from the generating device to supply moisture into the reservoir.

This prior patent invention technology can be freely controlled by heating or cooling through the air conditioner according to the characteristics of the fruit stored in the storage of the various kinds of fruit in the storage for a certain period of time, as well as inside the storage through the nitrogen supply By supplying enough nitrogen, it is possible to prevent fruit from being disperse as much as possible even if the fruit is stored for a long time if necessary, so that it can maintain the best commerciality by maintaining optimum ripeness and high freshness until the time when the fruit is actually shipped to the market. And a unique effect of easily maintaining the nitrogen concentration and the oxygen concentration in the reservoir at a desired level by preventing the air inside the reservoir from flowing back to the nitrogen supply side during the operation of the nitrogen supply unit as well as during the operation. You can expect The stresses.

However, the above-mentioned prior patent invention has not considered the problem of an unpleasant atmosphere air of the cold store which brings about an efficient control method and an excessive amount of ozone to limit the amount of excessive ozone which may adversely affect the human body.

Ozone has a characteristic fishy smell, faint blue color, and is generated as a discharge in the air. The ozone is strong in oxidizing power and is effective in bleaching and disinfection, but when its concentration increases and exceeds a certain level (about 0.25 ppm), the human body It may adversely affect the respiratory system of the human body and further harm to humans when it reaches 5-10 ppm, so preparation for sterilization and deodorization using ozone in low temperature warehouse is required.

The present invention is to solve the problems in the conventional low-temperature warehouse as described above, the object of the present invention is to sterilize the food stored in the low-temperature warehouse and remove the odor generated in them to maintain an optimal product storage state ozone concentration The freshness maintenance device of the sensor-based low-temperature warehouse and its control method to perform the automatic adjustment function, control the emergency ventilation for reducing ozone concentration immediately when the manager and the worker enter and exit, and perform the alarm and remote emergency manager emergency call function. To provide.

The freshness control method of the sensor-based low-temperature warehouse of the present invention for achieving the above object is that when the temporary access button on the control panel provided on the entrance door side of the low-temperature warehouse is selected, the control unit displays the current ozone concentration value in the low-temperature warehouse on the display. In addition, the operation of the ozone generator is shut off and the residual ozone in the cold warehouse is urgently discharged, and when the door is opened while the residual ozone in the cold warehouse is lowered sufficiently below the set value by the emergency exhaust, Determining information on the number of people remaining in the low temperature warehouse by cumulatively calculating the number of entry and the number of persons in the low temperature warehouse, and when the door is closed, if there is a residual number in the low temperature warehouse based on the door, it displays a warning state. When a certain time elapses, an alarm is generated and an administrator is urged by using a wireless communication network. If there is no residual number in the low temperature warehouse based on the door when the door is closed and the door is closed, immediately operate the ozone generator to the maximum value for a predetermined time to raise the ozone concentration in the low temperature warehouse, and in the elevated low temperature warehouse. When the ozone concentration reaches the set value detected by the ultraviolet light guide sensor, the operation of the ozone generator is shut off and the odor gas in the low temperature warehouse detected by the gas sensor is detected, and the odor gas detected by the gas sensor exceeds the set value. If the ozone generator is operated for a certain period of time, the ozone concentration in the low temperature warehouse is increased above the set value. The ozone generator maintains a high concentration of ozone. When the odor gas detected by the gas sensor is lower than the set value, the ozone generator is detected again. Determining whether to operate.

The present invention minimizes the effect of ozone on the human body in the deodorization and sterilization method in a cold store using an ozone generator, and through the management of the person by an accessor counting sensor provided on the entrance door of the cold store, Prevent accidents.

In addition, the present invention is to dualize the sterilization and deodorization in the low-temperature warehouse to control the ozone is selectively generated only when the odor occurs, it is possible to minimize the management cost of unnecessary ozone generation and minimize the ozone smell with a sense of rejection.

In addition, the present invention, if the conditions for the occurrence of safety accidents that can occur in the low-temperature warehouse of ozone deodorization and sterilization is established, it is possible to take a quick follow-up by automatically calling the remote low-temperature warehouse manager through a wireless communication network, if necessary Administrators can monitor, control and manage multiple low-temperature warehouses in remote locations through wireless communication.

1 is a block diagram of a freshness maintaining device of a sensor-based low temperature warehouse of the present invention.
2 is a flowchart illustrating a freshness maintenance control method of a sensor-based low temperature warehouse of the present invention.

Ozone is a gas with a peculiar irritating odor. The third of the three atoms is weakly bound and easily separated, making it a highly oxidizing generator oxygen. Water treatment disinfects, disinfects, removes taste and odors, decomposes surfactants, It is widely used for the purpose of removing iron and manganese, improving coagulation sedimentation efficiency, removing pesticide components, and the like.

Ozone is an unstable gas, which is highly chemically active, causing chemical reactions with bacteria, viruses, fungi, and odorous gases in the air and water, and organic substances (solvents, pesticides, heavy metals, etc.) that are harmful to the human body. Oxidize. By using this property, bacteria remaining in air or water can be quickly and powerfully sterilized into clean air or water, and the ozone gas used in the oxidation reaction is oxygenated and extinguished in the air or in water and is a non-polluting substance.

Therefore, when ozone is applied to a cold storage warehouse, it is possible to store long-term storage products fresh and safe in accordance with the sterilization and deodorization effect.

However, ozone, which is very effective for sterilization and deodorization, has a great effect on the human body.

If the ozone concentration is more than 0.12ppm, the Ministry of Environment issues a warning, if it is more than 0.3ppm, an alarm is issued, and if it is more than 0.5ppm, a major alarm is issued. It can be seen that exposure to humans is very dangerous.

When the ozone concentration is above 0.12ppm, it irritates eyes and nose, induces anxiety and headache, increases respiratory rate, and when it is above 0.3ppm, causes respiratory irritation, chest pressure and decreased vision. It is known to cause bronchial irritation, pulmonaryemia and the like.

Therefore, if the ozone generator is installed in the cold warehouse for the purpose of sterilization and deodorization of the stored goods, the manager or worker who enters the cold warehouse may be injured accidentally without considering the effect of ozone on the human body.

The half-life of the total ozone concentration is known to take 10 to 15 hours in air and 20 to 30 minutes in water. Therefore, if the dependence on the ozone concentration's natural halving reference time according to this criterion, the waiting time for using the cold warehouse for avoiding human hazards becomes too long.

1 is a block diagram of a freshness maintaining device of a sensor-based low temperature warehouse of the present invention.

As referred to herein, the door opener 15 and the door counter 17 are installed in the doors and the inside of the low temperature warehouse, respectively, so that the door open signals and the number of doors counted by the door sensors and the door counters, respectively. Connect to the control unit 10 to be applied.

The door sensor 15 may be configured as an on / off contact switch for detecting whether the door of the low temperature warehouse is opened or closed, and the accessor counter 19 is based on a superconducting sensor or an infrared sensor based on the low temperature warehouse. By sensing and counting the number of people entering and the number of people moving out of the low temperature warehouse, information is generated to determine whether a manager or worker remains in the current low temperature warehouse.

In addition, the control unit 10 displays a setting and function selection unit 11 for setting various control conditions including an ozone generation cycle time value in a low temperature warehouse or registering entry into a low temperature warehouse, a low temperature warehouse access information, and an ozone concentration. To connect the display 18, the gas sensor 14 for sensing the occurrence of odor in the low temperature warehouse and the ultraviolet light guide sensor 16 for sensing the ozone concentration in the low temperature warehouse is also configured to connect.

The setting and function selection unit 11 determines an activation event cycle value, an alarm value, a gas sensor sensing concentration reference value, etc. of the communication module in addition to the ozone generation cycle time value by the ozone generator, and inputs it to the controller 10. Can be. In addition, this setting and function selection section 11 is selected when the administrator or user temporarily opens and closes the door for a long time for the entry and exit of the low-temperature warehouse and the upper and lower stages of the dance in the low-temperature warehouse. The product input and output selection button can be provided as a separate independent button.

The gas sensor 14 may use an odor sensor that senses ammonia gas or hydrogen sulfide gas causing odor.

The controller generates an ozone by inserting the input values of the gas sensor 14, the door sensor 15, the ultraviolet light guide sensor 16, and the accessor counter 17 into an ozone generation control program that is set and registered in advance. The control signal is generated to selectively drive control the ozone generator 13 and the air blowing device 21 through the driver 12.

In addition, the control unit 10 has a series of information generating event values according to the output of the door sensor 15 and the accessor counter 17 and the odor sensing information event detected by the gas sensor 14 in the internal memory (not shown). The value is stored, and the storage information for each event in the memory is stored in the communication module in addition to the values registered and set by the setting and function selection unit 11, for example, an ozone generation on / off time input value by the ozone generator. It is configured to wirelessly transmit to the remote manager through the communication module 20 together with the activation event cycle value, alarm value, gas sensor sensing concentration reference value, and also the remote control signal of the cold storage by the remote manager of the communication module It is configured to be executed and transmitted to the sound control unit through the unmanned management of cold storage management.

Referring to the operation of the present invention configured as described above in detail.

Since the setting and function selection unit 11 and the display 18 combined with the control unit 10 of the device of the present invention are installed in the entrance door of the low temperature warehouse, the internal state information of the low temperature warehouse can be checked from the outside and the required setting control value Can be registered or changed, these settings and function selection unit 11 and the display 18 can be configured as a body by applying a touch screen module.

When the manager or worker operates the entrance and exit button on the setting and function selection unit 11 provided outside the door for low temperature warehouse access, the controller 10 controls the ozone concentration value in the warehouse detected by the UV light sensor 16. And display the waiting time value through the display 18 and drives the air blower (21).

The air blowing device 21 and the ozone generator 13 are not driven at the same time by the controller 10, and only one of them is selectively operated.

The entrance / waiting time value is generated by calculating and processing the current ozone concentration value detected by the ultraviolet light guide sensor 16 and the hourly exhaust capacity of the air blowing device 21 by the controller 10.

The ultraviolet light guide sensor 16 is installed inside the low temperature warehouse to detect the amount of ozone by the ultraviolet light transmission method, the ultraviolet light method measures the change in the amount of ultraviolet absorption near the wavelength of 254mm. The ozone sensing through ultraviolet absorption has the advantage that the response speed is fast and the selective absorption of ozone prevents malfunction due to other gases and the periodic calibration is relatively small. In general, a method of quantitatively analyzing ozone by measuring the absorbance at 253.7 nm using a mercury lamp in the ultraviolet region is widely used.

If the manager or subcontractor opens the door to ignore the waiting time shown on the display and the manager or subsidiary enters the low temperature warehouse, the switch contact of the door sensor 14 installed at the door is generated so that the controller 10 stores the low temperature warehouse. The driving circuit of the ozone generator 13 for ozone generation is shut off, and the air blower 21 for forcibly evacuating the ozone remaining in the atmosphere inside the cold store is forced to the outside, and the control unit warns of safety. As the display warning flashing and the alarm by the alarm generator 19 will be generated.

2 is a control flowchart of a control unit for explaining the freshness maintenance control method of the sensor-based low-temperature warehouse of the present invention.

As shown here, the control unit needs to determine whether the person who wants to enter the low temperature warehouse has pressed the temporary entry / exit selection button on the setting and function selection unit 11 provided on the low temperature warehouse entry / exit door side or the product entry / exit entry / exit button.

If the person presses the selection button of the goods entry and exit, the control unit shuts off the operation of the ozone generator. In this state, if the worker performs the goods receiving or shipping operation and switches the control device to the ozone generation mode, the control unit is in the low temperature warehouse. Maintain ozone generation and proper concentration.

If the accessor selects the temporary access button, the controller displays the current ozone concentration value on the display, blocks the operation of the ozone generator, and operates the ventilation device to perform emergency ventilation.

The real-time concentration value in the cold store due to emergency ventilation is detected by the ultraviolet light guide sensor 16 and transmitted to the control unit. When the ozone concentration in the cold store drops below a safe setting value for the human body, the control unit opens a door open state. It is displayed through the display.

When it is confirmed through the display that the ozone concentration value in the cold store has reached a safe value, when the person opens the door, the person counting by the person counter 17 is performed.

The human body counting by the accessor counter 17 subtracts the number of entrants (enters) and the number of entrants (enters) from the low-temperature warehouse on the basis of the entrance door, and when the door is closed, the number of people remaining in the low-temperature warehouse on the basis of the door The control unit can determine whether or not there is.

If the result of the operation processing result is not matched with the control unit, the control unit sends out a warning indication flashing operation on the display to warn that there is a residual number in the low temperature warehouse.

When such a warning is maintained for a certain time (for example, 10 minutes), an alarm is generated through the alarm unit to actively warn the low-temperature warehouse manager or worker. When such a warning condition occurs, the control unit may generate an emergency call command to the manager communication terminal of the remote place through the communication module.

On the other hand, if the entry door number and exit exit number match when the filling door of the low temperature warehouse is closed, the control unit considers that there are no people in the warehouse and operates the ozone generator to the maximum value for a certain time (for example, 15 minutes) to control the inside of the low temperature warehouse. The ozone generator is continuously operated until the ozone concentration is increased and the ozone concentration detected by the ultraviolet light guide sensor is compared with the set value until the set threshold is reached.

When the ozone concentration in the cold store reaches the set value, the operation of the ozone generator is shut off and the odor gas in the cold store detected by the gas sensor is detected.

At this time, if the malodorous gas detected by the gas sensor is higher than the set value, the ozone generator is additionally operated for a predetermined time to increase the ozone concentration in the low temperature warehouse to the set value or more to maintain the high temperature concentration in the low temperature warehouse.

Then, when the odor gas detected by the gas sensor is below the set value, the controller determines whether to operate the ozone generator by detecting the ozone concentration again and comparing it to the reference set value.

10: control unit
11: Setting and function selection
12: driver
13: ozone generator
14 gas sensor
15: door sensor
16: UV light guide sensor
17: Passenger Counter
18: display
19: alarm generating unit
20: communication module
21: blower

Claims (5)

 Gas sensor 14, door sensor 15, ultraviolet light guiding sensor 16, and accessor counter 17, which are respectively installed inside and outside the door of the low temperature warehouse, and an ozone generating device that generates ozone in the low temperature warehouse ( 13), a ventilator (21) for exhausting the air inside the cold warehouse to the outside to reduce the ozone concentration in the low temperature warehouse, and a setting and function provided on the outside of the entrance door of the low temperature warehouse, the entrance button and the ozone concentration setting input button A selection unit 11, a display 18 for displaying ozone concentration values in a low temperature warehouse, and a state of venting and ozone generation, and a door open signal and an entrance count signal sensed by the door sensor and an access counter, respectively. When the door is closed and the door is closed, if there is no residual number in the low temperature warehouse and there is no residual number in the low temperature warehouse, ozone until the ozone concentration value registered by the setting and function selection unit is reached By driving the production device 13 to increase the ozone concentration in the low temperature warehouse, and driving the wind blowing device 21 in the state of shutting off the ozone generating device when the entrance and exit button input of the setting and function selection unit and the ultraviolet light guide sensor 16 Freshness maintenance device of the sensor-based low-temperature warehouse, characterized in that it comprises a control unit 10 for controlling the expression of the real-time storage ozone concentration detected by the display via the display (18). The freshness maintaining apparatus of a sensor-based low temperature warehouse according to claim 1, wherein the gas sensor (14) is ammonia gas or hydrogen sulfide gas detection sensor. The sensor-based low temperature warehouse according to claim 1, wherein the control unit (10) transmits an emergency call command to a remote administrator in case of an emergency and further comprises a communication module (20) for remote control of the low temperature warehouse by the administrator. Freshness retainer. The method according to claim 1, wherein the accessor counter 19 is configured to sense the number of people entering the low temperature warehouse and the number of people moving out of the low temperature warehouse based on the superconducting sensor or the infrared sensor. Freshness maintenance device of sensor-based low temperature warehouse. If the temporary access button on the control panel provided on the entrance door side of the low temperature warehouse is selected, the control unit displays an ozone concentration value in the low temperature warehouse on the display and blocks the ozone generator operation and urgently discharges the remaining ozone in the low temperature warehouse. If the door is opened while the residual ozone level in the cold warehouse is lowered below the set value by the emergency exhaust, the number of occupants and exits in the cold warehouse is accumulated by counting the number of visitors in the cold warehouse through the access counter installed on the door side. Judging the information, and when the door is closed, if there is a residual number in the low-temperature warehouse based on the door, it indicates a warning state, and after a certain time elapses, an alarm is generated and an emergency call is made to the manager using the wireless communication network. Residuals in the low temperature warehouse based on the door when the door is closed If not, immediately operate the ozone generator to the maximum value for a predetermined time to raise the ozone concentration in the cold store, and block the operation of the ozone generator when the ozone concentration in the cold store reaches the set value detected by the UV light sensor. Detecting the odor gas in the cold warehouse detected by the gas sensor; and if the odor gas detected by the gas sensor is above the set value, the ozone generator is additionally operated for a predetermined time to increase the ozone concentration in the low temperature warehouse above the set value. Maintaining a high concentration of ozone and maintaining the freshness of the sensor-based low temperature warehouse, comprising: detecting whether the ozone generator is operated by detecting the ozone concentration if the odor gas detected by the gas sensor is less than or equal to a predetermined value. Control method.

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