TWI528854B - Defogging glass display cabinet control device - Google Patents

Description

Defogging control device for display cabinet glass

The invention relates to an energy-saving control device for a defogging glass of a closed type refrigerating display cabinet or an open type refrigerating display cabinet.

A humidity detecting unit is attached to the door frame of the display cabinet to detect the humidity on the door frame for control, and the application range is small, and can only be applied to an environment with fixed temperature control. Or a control device having three detectors, respectively a temperature detector attached to the defogging glass of the display cabinet, a room temperature detector, a humidity detector, wherein the dew point temperature is calculated on the condition of room temperature and humidity, The defogging glass surface temperature data measured by the temperature detector of the defogging glass is compared with the dew point temperature data.

The refrigerated display cabinets used in the market are mainly divided into closed and doorless open display cabinets with doors. The temperature in the freezer display cabinet is about -18 degrees C, and the refrigerated display cabinet is about 4 degrees C. In order to make it easier for customers to visually purchase the products and prevent the cold air from leaking out of the store, the closed refrigerated display case is equipped with a defogging glass or an open display case with side wall glass, because of the lower temperature in the library. The difference in temperature outside the library, so the surface temperature of the defogging glass in contact with the room temperature will be lower than the dew point temperature of the room temperature space, so the surface of the defogging glass will begin to fog, at this time, In order to solve the problem of fogging, the customary method is to use multi-layer glass to reduce the temperature transfer inside and outside the library, but still cannot completely solve the problem of fogging, so it must be in the glass. The surface is sprayed with a transparent metal conductive film, which can be heated by energization, which is called a defogging glass heater. The defogging glass heater is no longer fogged by energization, but it consumes a lot of energy.

The proposal of this creation is a long-term observation, and it is a practical and easy to commercialize the defogging control device of the display cabinet glass which is not limited to the specific air-conditioning environment, mainly using a humidity detector and a room temperature detection. In accordance with the method of building a table, the cycle and heating time data of the conductive and power-off ratio of the defogging glass measured under the temperature and humidity conditions are measured by the environmental control laboratory. The control method is corresponding to the room temperature and humidity data of the table. Set the cycle time of the conduction and power-off ratio of the defogging glass heater, and continuously control the interlace to ensure that the surface temperature of the defogging glass is continuously controlled to the non-condensing state, and the defogging is obtained under the room temperature and humidity conditions. The ratio of the cycle time of the conductive and power-off of the glass heater, and the cycle time of the conduction and power-off ratio required for the room temperature, humidity, and defogging glass heater are recorded in the memory of the microprocessor, the microprocessor The control method is to obtain the proportional cycle time of the conduction and power-off of the defogging glass heater corresponding to the table according to the room temperature and humidity data of the table, according to the time Length error control defogging heater conductive glass and off, to ensure that each point defogging glass surface temperature are continuously controlling a state without fogging. Due to the difference in the uniformity of the metal film coated on the surface of the defogging glass and the sinking effect of the cold air in the reservoir, the temperature above the temperature of the library and the temperature below the temperature of the library are at least several degrees, thereby causing the surface of the defogging glass. There are also several degrees of temperature difference between the top and bottom. Due to the flow field of the air in the library, there is also a temperature difference between the left and right sides of the defogging glass. It is not easy to find the precise control point on the defogging glass surface with uneven temperature. Therefore, the calculation is not enough to make precise control, in the conventional technology. In addition, a temperature detector must be attached to the surface of the defogging glass. The surface temperature of the defogging glass detected is compared with the room temperature or the dew point temperature, and the comparison value is used for comparison control, which also causes the temperature point. The selected position is different, and there is a large error. Moreover, a temperature detector must be installed on the surface of the defogging glass, which not only causes inconvenience in use, but also increases the cost. The principle of the creation is to remove the conventionally attached to the defogging glass surface. Temperature detector, this room only needs to install room temperature detector and humidity detector to explore the room temperature and humidity around the refrigerated display cabinet. Based on the conditions of room temperature and humidity, create a table and find out the experiment in the environmental control room. In the case of fogging the defogging glass, the cycle time of the conduction and power-off ratio required for the defogging glass heater belongs to the defogging control of the overall defogging glass surface. The optimum defogging control referred to here means normal. The defogging glass surface felt by the eyesight person is just in the timing of no fogging. At this time, the conduction and power-off ratio cycle time of the defogging glass electric heater is the best conductive and power-off ratio. The reason is that the timing of the human body when it is not fogging when purchasing items is the best condition for visually purchasing items. At this time, the defogging state can be accurately controlled, and the data can be done on the same machine. The conditional control can be used in various environments without having to do data experiments for each unit. The construction control mode proposed by this creation can also be converted into the dew point temperature by using the obtained room temperature and humidity, and then the table is established according to the difference between the dew point temperature and the room temperature, and the experiment is performed according to the difference, and the difference is obtained. Under the condition, the optimal defogging glass heater does not make the defogging glass heater's conductivity and power-off ratio cycle time to do the defogging control, which is attached to the surface of the defogging glass as described in the new patent of the Republic of China Patent Certificate No. M199426. The method of controlling the difference between the temperature detected by the temperature detector and the room temperature is different. The method does not obtain the humidity condition in the environment, and the accuracy of the natural control is insufficient. The method proposed by the present invention has an improvement in control precision. The method proposed by the Republic of China Patent Certificate No. M197855 is subject to the calculation of the dew point temperature by a room temperature detector and a humidity detector, but the temperature detector must still be attached to the defogging glass. The obtained temperature data is compared with the dew point temperature, but because the temperature of the glass is close to the temperature, it is not easy to select the representative point, so it is necessary to make a large error adjustment. The place where the creation has better newness is Eliminating the temperature detector of the defogging glass surface that must be attached to the prior art, this creation only needs to use the room temperature and humidity detector to accurately eliminate the best data according to the table and experimental verification in a complex atmosphere. Fog glass conduction and power-off ratio cycle time defogging control, practical and convenient in the use of goods.

Generally, there are only a few types of defrosting glass and several wattages. The method proposed in this creation is to test each model in a controlled environment to obtain the conductivity of the defogging glass heater set at room temperature and humidity. And the power-off proportional cycle time, so in all kinds of environments, the defogging glass of each model can be controlled under the optimal energy-saving conditions. After each model obtains data through one test, each model can be produced in mass production mode in each factory. If the old model is in different sizes, the model can be proportional to the tested model data. Convert the wattage and glass surface area to obtain the value of the cycle time of the conductive and power-off ratio of the defogging glass heater; this creation can be independently designed into a set of defogging controllers and other necessary functions such as compression Machine start and stop, defrosting control, combined with design as a controller, the original controller of the display cabinet is equipped with a defogging glass heater control relay contact to control the constant starting of the defogging glass heater power supply. This creation can be based on each room. The value of the cycle time of the conduction and power-off ratio of the defogging glass heater experimentally measured by the temperature and humidity conditions, and the cycle time of controlling the conduction and power-off ratio of the defogging heater control relay have been changed. Good energy saving effect.

There are some patents on defogging in the market, which must be used in an environment with fixed room temperature air conditioners. It is not effective for use in a variety of environments. This creation is mainly used in display cabinets in non-air-conditioned environments. Can be used in air-conditioned environments. The following analysis of this creation and the city The difference between other patents on the surface is firstly based on the new patent of the Republic of China patent certificate No. M258270, and a humidity detecting unit is attached to the door frame to detect the humidity on the door frame, and the missing is investigated by the market. The humidity detection unit is in contact with dew for a long time, and it is corroded and rusted in a short period of time. It is also difficult to select due to the fitting point, resulting in insufficient precision. It is also impossible to apply to a large amount of temperature and humidity change because only a single data in the environment is obtained. In the environment, it can only be used in a fixed environment with air conditioning. The invention patent of the Republic of China Patent Certificate No. I392839 proposes the temperature compensation measures missing from the aforementioned new patent of the Republic of China Patent Certificate No. M258270, but it still cannot compensate for the error caused by the humidity change. The precise control of environmental changes must be based on the scene. At room temperature and humidity, and the problem of corrosion is still unsolved, the memory history data proposed by the new patent of the Republic of China Patent Certificate No. M387983 is not only a remedial measure due to corrosion, but also a self-reporting detector may cause impurities. Precipitation, and then self-reported that the two induction circuits are mainly metal conductors, which emit signals by the characteristics of short circuit caused by contact with dew condensation water. Therefore, metal oxidation is likely to occur after use, and there is no detection of room temperature. Performed in an air-conditioned environment. The difference between this creation and the method of the Republic of China Patent Certificate No. M197855 is that the patent must be equipped with a temperature detector on the defogging glass. The door is active and pulls a temperature line, which is not only difficult but also unattractive. Labor and cost, so the old machine is more difficult to achieve, because the temperature of the defogging glass is uneven, so the selection of the temperature point of the defogging glass is not easy, and it is more difficult to achieve precise control. Another difference is that the creation is By means of the method of environmental control and verification, according to the conditions of room temperature and humidity described above, the actual conduction time of the conductive and power-off ratio of the defogging glass heater is obtained, and the starting temperature of the non-condensing point of the glass surface is controlled. The creation of this creation is easy to commoditize, has excellent energy-saving potential, and a method of precise control, which provides a great contribution to energy conservation and carbon reduction, has met the novelty and progressive patent requirements, and has applied for it according to law. I urge you to approve this patent application to encourage creation. One of the environmental humidity detectors required by this creation is to measure the ambient humidity and directly take values in the environment. It does not produce water droplets due to water vapor saturation, so its life is as long as the general humidity detector. Life cycle.

1‧‧‧ display module

2‧‧‧Humidity conversion module

3‧‧‧ room temperature conversion module

4‧‧‧ Humidity detector

5‧‧‧ room temperature detector

6‧‧‧Microprocessor

7‧‧‧Setting unit

8‧‧‧ memory

9‧‧‧LED module

10‧‧‧Liu Wen detector

11‧‧‧Kow temperature conversion module

12‧‧‧Distribution fan control relay

13‧‧‧Defrost control relay

14‧‧‧Compressor Control Relay

15‧‧‧ cooling fan

16‧‧‧Defogging glass heater control relay

17‧‧‧Compressor

18‧‧‧Defrost electric heating

19‧‧‧Defogging glass heater

Figure 1 is a flow chart of an embodiment of the present invention.

Figure 2 is a defogging control device for the display case glass of the present invention.

The present invention proposes a flow chart of the defogging control implementation method of the defogging control device for the display cabinet glass. As shown in Fig. 1, the defogging control device (30) of the display cabinet glass captures the temperature and humidity values in the environmental control laboratory. Recorded in the table (31), the next step selects the temperature and humidity table mode or the difference between the dew point temperature and the room temperature table mode (32), if the temperature and humidity table mode is selected, in the environment with temperature and humidity First, select a certain temperature and humidity condition in the table, and then measure the conduction and power-off ratio cycle time of the optimal defogging glass heater under the environmental control condition, so that the side of the defogging glass contacting the room temperature is controlled to be non-condensing. The starting temperature, and record the cycle time value of the conduction and power-off ratio of the defogging glass heater (33), and then repeatedly set the temperature and humidity conditions to find the conductivity of the best defogging glass heater under various temperature and humidity conditions. And the power-off proportional cycle time, and record the cycle time of the conduction and power-off ratio of the defogging glass heater at that time (34). The optimal cycle time of the defogging glass heater described here refers to defogging. Glass control The temperature of the conduction and temperature of the best thermal defogging glass heater under the conditions of all the temperature and humidity conditions set is not recorded, and is recorded in the table, and the defogging control device of the display cabinet glass Combined with the design, the table data is written into the memory (35), and the defogging control device of the display cabinet glass controls the conduction and power-off proportional cycle time of the defogging glass according to the temperature and humidity type table mode (36), such as selecting the dew point temperature. Difference from room temperature For the value table mode, calculate the dew point temperature (37) according to the equation of room temperature and humidity, and establish the difference between the dew point temperature and the room temperature (38). First select a dew point temperature and room temperature in the table. The difference condition, then set the cycle time of the conductive and power-off ratio of the defogging glass heater, so that the side of the defogging glass that contacts the room temperature is controlled to a non-condensing starting temperature, and the conductivity of the defogging glass heater at that time is recorded. And the power-off proportional cycle time (39), and then repeatedly set the difference between each dew point temperature and room temperature, find out the optimal defogging glass heater's conductivity and power-off ratio cycle time under each condition, and record the time Conductive and power-off proportional cycle time of the defogging glass heater (40), until the set of all the dew point temperature and room temperature difference between the best defogging glass heater conduction and power off ratio cycle time , one by one built on the form to do control.

The present invention proposes an embodiment to provide a reference, and establishes a corresponding table of the conductive and power-off ratio cycle time of the defogging glass heater for each environmental condition, and the control circuit structure designed in combination with the defogging control device of the display cabinet glass is as follows. As shown in the figure, the defogging control device of the display cabinet glass comprises at least a microprocessor (6), a room temperature detector (5), a humidity detector (4), a room temperature conversion module (3), a Humidity conversion module (2), a storage detector (10), a library temperature conversion module (11), a display module (1), and a setting unit (7), a memory (8), An LED module (9), a compressor control relay (14) controls the start and stop of the compressor (17), a cooling fan control relay (12) controls the start and stop of the cooling fan (15), and a defogging glass heater The control relay (16) controls the start and stop of the defogging glass heater (19), and a defrost electric heating control relay (13) controls the start and stop of the defrost electric heating (18), and each component is composed of a microprocessor as a core, and constitutes an inclusion The defogging control device of the display cabinet glass designed in the present invention is first operated by the controller according to the setting unit. The value of the degree is used to control the start and stop of the compressor (17). The data of the room temperature detector (5) and the humidity detector (4) are also collected by the microprocessor (6), and are judged and selected by the program of the microprocessor. The best of all models under various temperature and humidity conditions The corresponding table data of the defogging glass heater conduction and power-off proportional cycle time is used to control the cycle time of the defogging glass heater conduction and power-off ratio.

1‧‧‧ display module

2‧‧‧Humidity conversion module

3‧‧‧ room temperature conversion module

4‧‧‧ Humidity detector

5‧‧‧ room temperature detector

6‧‧‧Microprocessor

7‧‧‧Setting unit

8‧‧‧ memory

9‧‧‧LED module

10‧‧‧Liu Wen detector

11‧‧‧Kow temperature conversion module

12‧‧‧Distribution fan control relay

13‧‧‧Defrost electric control relay

14‧‧‧Compressor Control Relay

15‧‧‧ cooling fan

16‧‧‧Defogging glass heater control relay

17‧‧‧Compressor

18‧‧‧Defrost electric heating

19‧‧‧Defogging glass heater

Claims (5)

A defogging control device for display cabinet glass is applied to a display cabinet with a defogging glass heater, comprising: a defogging glass heater, a glass heating control for the display cabinet, a room temperature detector, and a humidity detector , a library detector, a room temperature conversion module, a humidity conversion module, a library temperature conversion module, a microprocessor, a compressor control relay, controlled by a microprocessor, according to the value of the freezer temperature Controlling the start and stop of the compressor, a cooling fan control relay, controlled by the microprocessor, controlling the start and stop of the cooling fan, wherein the cooling fan is used for heat dissipation of the display cabinet, and a defogging glass heater control relay is controlled The microprocessor controls the start and stop of the defogging glass heater, wherein the defogging glass heater performs the defogging glass heater according to a temperature and humidity table mode or a difference between a dew point temperature and a room temperature table mode a defrost electric heating control relay, controlling the defrost electric heating control relay to start and stop, performing the defrost control of the display cabinet, a display module, controlled by the microprocessor, a setting unit, controlled by The processor, a memory, controlled by the microprocessor, memorizes the temperature of the defogging control device of the display cabinet glass, room temperature, humidity and defogging glass heater conductive and power-off ratio cycle time, an LED module Controlled by the microprocessor, the above components are based on the microprocessor, which constitutes a defogging control device for the glass of the display cabinet. A defogging control method for a defogging control device for a display cabinet glass according to claim 1, wherein the defogging glass heater operates according to a temperature and humidity type table mode, a room temperature detector and a humidity detector The conversion module is converted into room temperature and humidity to detect the room temperature and humidity of the environment around the display cabinet. Then, based on the values of room temperature and humidity, a table is established, and the room temperature and humidity and control are controlled by the environmental control room experiment mode. When the conductivity and power-off ratio of the defogging glass heater is cycled In the meantime, find out the temperature of each starting point that does not fog the defogging glass, and record the experimental data of the cycle time of the conductive and power-off ratio of the defogging glass heater at that time, and operate the room temperature, humidity, and defogging glass heaters. The time data is written into the microprocessor memory, and the actual operation control method is to obtain the room temperature and humidity data of the table in the memory, and obtain the conduction and power-off of the defogging glass heater corresponding to the room temperature and humidity data. The proportional cycle time, the microprocessor continuously controls the conduction and power-off of the defogging glass heater according to the time, ensuring that the surface temperature of the defogging glass is continuously controlled to be in a state of no fogging. A defogging control method for a defogging control device for a display case glass according to claim 1, wherein the control of the defogging glass heater is based on a table type of a difference between a dew point temperature and a room temperature, the mode being at least Include a humidity detector to detect humidity, a room temperature detector to detect room temperature, convert the temperature and humidity data into a dew point temperature, and then establish a table of the difference between the dew point temperature and the room temperature in the environment where the display cabinet is located, Control the difference between the dew point temperature and the room temperature in the environmental control room experiment mode, and then control the cycle time of the conduction and power-off ratio of the defogging glass heater at that time, find out the temperature of each starting point that does not fog the defogging glass, and then The difference between the dew point temperature and the room temperature data and the defogging glass heater operating time data are written into the memory of the microprocessor. The actual control method is the data corresponding to the difference between the dew point temperature and the room temperature of the memory table. Obtaining a proportional cycle time of conduction and power-off of the defogging glass heater corresponding to the data, and the microprocessor continuously controls the conduction and power-off of the defogging glass heater according to the time Ensure that every point of the surface temperature of the defogging glass is continuously controlled to a state of no condensation. The defogging glass heater is electrically conductive and de-energized when the defogging glass heater conductance and power-off ratio cycle time is applied to different defogging glass surface areas, as in the defogging control method described in item 2 or item 3. The proportional cycle time can be calculated in proportion to the surface area of the defogging glass. The defogging control method according to item 2 or item 3 of the patent application scope, the ventilation and power-off ratio cycle time of the defogging glass heater may add a control parameter to the micro-control device control program, and the parameter may be increased. Or reduce the cycle time of the defogging glass heater conduction and power off ratio.