JP2006006601A - Heating controller for showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller capable of rapidly heating merchandise as needed by the simple constitution of the heater of each merchandise shelf of a showcase. <P>SOLUTION: In the showcase provided with the merchandise shelves incorporating the heaters 21 and 22-2n for heating the merchandise and temperature sensors 11 and 12-1n for heater control, a means 2 for activating a merchandise rapid pull-up mode for each merchandise shelf and a means for correcting a heater temperature regulation temperature to a value higher than a set temperature T by a correction temperature A over prescribed time B when the rapid pull-up mode is activated are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heating control device for a showcase having a product shelf incorporating a product heating heater.

In showcases where heated products are used for display and sale, a plurality of product shelves generally incorporating a product heating heater and a heater control temperature sensor are provided, and the heaters of each product shelf are based on the temperature detected by the temperature sensor. The product temperature is controlled to the target value by performing on / off control. In this type of showcase, when a product is replenished, the temperature of the replenished product is usually low, so there is a problem that it takes time to reach a temperature that can be used for sale. In order to solve this problem, the first heater is provided at the front and left and right sides of the product shelf to keep the product warm, and the second heater is provided at the rear of the product shelf to replenish the rear of the product shelf. It has been proposed to rapidly heat products (see, for example, Patent Document 1). In addition, it is provided with a cold insulation means and a heating means, and by switching the operation of both means, it is possible to select and display and sell either one of the refrigerated product and the warmed product. It consists of a heater and a temperature sensor arranged in a substantially U shape on the front end side and rear end side. Normally, the heater is turned on and off based on the temperature detected by each temperature sensor, and normal operation is performed when the product is replenished from the rear. There has also been proposed a showcase that switches from fast heating operation to fast heat operation, sets the ON time, turns off the front end heater, and turns on the rear end heater (see, for example, Patent Document 2). In addition, in the storage case of products for sale, a heater with a larger amount of heat generation is provided on the front side than the rear side, and the amount of heat generation on the front side, which is easily affected by outside air, is increased to quickly heat the product to a temperature suitable for sales. Or what enabled it to heat is proposed (for example, refer patent document 3).
JP 2003-180490 A (pages 2 to 4, FIG. 2) Japanese Patent Laying-Open No. 2003-189986 (page 6, FIG. 10) Japanese Patent Laying-Open No. 2003-190025 (pages 2 to 3, FIGS. 1 to 4)

  In the above-described showcases, the heaters provided on the front side and the rear side are respectively controlled to be turned on and off, thereby responding to rapid heating on the rear side. Therefore, the structure of the heater is complicated, and thus the control thereof must be complicated.

  An object of the present invention is to provide a control device that can quickly heat a product as required with a simple configuration of a heater of each product shelf of a showcase.

  In order to solve the above-described problems, according to the present invention, in a showcase having a product shelf incorporating a product heating heater and a heater control temperature sensor, means for starting a rapid pull-up mode of the product for each product shelf And means for correcting the heater temperature adjustment temperature higher than the set value for a predetermined time when the rapid pull-up mode is activated.

  Further, according to the present invention, in a showcase having a product shelf incorporating a product heating heater and a heater control temperature sensor and capable of switching between refrigeration and refrigeration, the refrigeration operation mode is switched to the refrigeration operation mode. In some cases, there is provided means for correcting the heater temperature adjustment temperature higher than a set value for a predetermined time.

  According to the present invention, in a showcase having a product shelf including a product heating heater and a heater control temperature sensor, the means for detecting the rate of increase in temperature detected by the temperature sensor, and the detected rate of increase Means for correcting the heater temperature adjustment temperature to be higher than the set value for a predetermined time when the temperature is equal to or less than a predetermined value.

  According to the present invention, in a showcase having a product shelf including a product heating heater and a heater control temperature sensor, the means for detecting the rate of increase in temperature detected by the temperature sensor, and the detected rate of increase And a means for correcting the heater temperature control temperature for a predetermined time to an optimum value according to the above.

  According to the present invention, in a showcase having a product shelf including a product heating heater and a heater control temperature sensor, the means for detecting the rate of increase in temperature detected by the temperature sensor, and the detected rate of increase And a means for correcting the heater temperature adjustment temperature higher than a set value for an optimum time according to the above.

  According to the present invention, each commodity shelf has only one heater, and the heater does not need to have a special configuration, and a normal simple configuration can be used as it is. It is as simple as just needing to correct the set value high and detecting the rate of temperature rise detected.

  Next, embodiments for carrying out the present invention will be described with reference to embodiments shown in the drawings.

  FIG. 1 is a control system diagram of the first embodiment of the present invention. 1 is a main control unit of the showcase, 11, 12,... 1n is a temperature sensor provided in each of the first, second,... Nth product shelves of the showcase, 21, 22,. It is a heater provided on the shelf. Reference numeral 2 denotes a quick pull-up start switch. The main control unit 1 has a preset temperature T (° C.) of the heater, a correction temperature width A (° C.) with respect to a set temperature at the time of rapid pull-up activation, and a correction duration B (minute) for each product shelf. It is remembered. In the normal storage operation mode, the showcase is supplied with power from the power source to the heaters 21, 22,... 2 n of the product shelves, and the temperatures detected by the temperature sensors 11, 12,. Is compared with the set temperature T stored in each product shelf, and when the detected temperature is lower than the set temperature, a command to turn on the heater, and when it is higher, a command to turn off the heater is sent from the main controller 1 to each heater 21, 22, 2n. The product shelf and thus the product on the product shelf are controlled to be kept at a predetermined temperature. Note that reference numeral 3 denotes a refrigeration / warm switching unit belonging to the second embodiment, which will be described later.

  Now, for example, it is assumed that a new commodity is replenished to the first commodity shelf, and the temperature of these commodities needs to be rapidly reached to a temperature at which the commodity can be sold. At that time, the rapid pull-up start switch 2 is turned on, a pull-up start command for the first product shelf is sent to the main control unit 1, and the set temperature T of the heater 21 is corrected to a value higher by the correction temperature width A. The set temperature is T + A (° C.), and this control condition is continued for a fixed correction duration B (minutes). Thereafter, the control is continued again based on the original set temperature T (° C.). An example of the relationship between the pull-up time and temperature during this period is shown in FIG. In FIG. 2, the horizontal axis represents time and the vertical axis represents temperature. When the heater is connected to the power source, the heater is heated from the normal temperature state, and the temperature detected by the temperature sensor 11, that is, the temperature adjustment temperature, gradually increases with time as shown by the curve p1 in FIG. The temperature reaches a set temperature T (85 ° C. in the example in the figure), and thereafter is kept constant at this set temperature (85 ° C.) by on / off control of the heater 21. The product temperature rises along the curve q1 in FIG. 2 at a temperature slightly lower than the temperature detected by the temperature sensor 11, and the product target temperature at a time t2 slightly delayed from the time t1 when the temperature detected by the temperature sensor 11 becomes constant (85 ° C.). (55 ° C. in the example in the figure) is reached, and thereafter the heater 21 is turned on and off so as to be kept constant at this target temperature.

  When a quick pull-up activation command is issued to the first product shelf, the set temperature is corrected as described above, T + A (85 + 10 = 95 ° C. in the example in the figure) becomes the new set temperature, and the heater 21 Since the control is performed based on the corrected set temperature, the temperature sensor detection temperature curve p1 indicated by the solid line in FIG. 2 continues to rise even when the original set temperature T is reached at time t1, and after time t1, it is indicated by a broken line. It changes along the curve p2 shown, stops rising for the first time at the time t3 when the temperature detected by the temperature sensor 11 reaches T + A (95 ° C.), and thereafter is held at a constant temperature T + A (95 ° C.). This control for correcting the set temperature continues from time t1 when the temperature detected by the temperature sensor exceeds the original set temperature until a preset correction duration B (minute) elapses, that is, until time t4, and then again. On / off control of the heater 21 is performed based on the original set temperature T. Therefore, the temperature sensor detection temperature curve p2 is lowered from the time point t4 and is kept constant at the original set temperature T. At that time, after the time point t1, the product temperature curve q1 rises with a steeper slope than the product temperature curve q1 when correction is not performed, as indicated by the dashed-dotted curve q2, and is not corrected. Sometimes the product target temperature (55 ° C.) can be reached as early as time t5 that is much earlier than time t2 when the target temperature is reached, and the pull-up time can be shortened by t2-t5. This is because in the conventional control, the temperature of the product shelf is raised only to the set temperature, whereas the set temperature is temporarily corrected to a high value and heated at a high temperature. If such high-temperature heating is always performed, the product temperature exceeds the appropriate temperature, and therefore, control is performed based on the original set temperature after a certain correction duration has elapsed. The same control is performed on the product shelves other than the first product shelf when rapid pull-up activation becomes necessary.

  The second embodiment is different from the embodiment shown in FIG. 1 in that a refrigeration / warm switching unit 3 is provided as shown in FIG. That is, when switching from the refrigeration operation mode to the refrigeration operation mode, it is desirable to set the product shelf at a low temperature to a temperature at which the refrigeration operation can be performed as quickly as possible. Therefore, when the refrigeration / warm switching unit 3 is operated, the switching command is sent to the main control unit 1, and as a result, a rapid pull-up activation command is issued as in the embodiment of FIG. The same control as in Example 1 is performed.

  FIG. 3 is a control system diagram of the third embodiment of the present invention. Components equivalent to those in the embodiment 1 of FIG. That is, the configuration of the temperature sensors 11, 12,... 1 n and the heaters 21, 22,... 2 n of each product shelf, and the main control unit 1, the heater set temperature T (° C.) and the correction temperature range A for each product shelf. (° C.) and the correction duration B (minutes) are stored in advance, but the main controller 1 further stores a preset product shelf temperature increase rate C, and this temperature. The difference is that an increase rate detecting means is provided. This product shelf temperature rise rate detecting means is a means for detecting the degree of rise from the relationship of the temperature of each product shelf with respect to time, and it is obtained by calculation in the main control unit 1 as the ratio between the detected temperature of the temperature sensor and the detected time. be able to.

  In this showcase, the temperature increase rate detected for each product shelf in the main control unit 1 and the product shelf temperature increase rate C stored in the main control unit 1 are constantly compared, and the detected temperature increase rate is detected. When the value exceeds the value C, normal heater on / off control is performed. If the detected temperature rise rate is equal to or less than the value of C, that is, if the temperature rise rate is slow with respect to time, it means that the load is large and the pull-up time is long. As in the first embodiment, the set temperature is corrected. The control is exactly the same as in the embodiment of FIG.

  FIG. 4 is a control system diagram of the fourth embodiment of the present invention, and the same reference numerals are given to the same parts as in the embodiment of FIG. That is, the configuration of the temperature sensors 11, 12,... 1n, heaters 21, 22,... 2n of each product shelf and the main control unit 1 correct the heater set temperature T (° C.) and the correction temperature for each product shelf. The duration B (minutes) and the commodity shelf temperature increase rate C are stored in advance, and the temperature increase rate detection means is similar, but the set temperature correction temperature width is not a single value but a plurality of values. The point which has the value divided into the division of is different. That is, if the rate of increase C is greater than a certain value, for example, if C ≧ 2, the correction temperature is 0 ° C., and if the rate of increase C is in a range between a certain value and a certain value, for example, 1.8 ≦ C < In the case of 2, the correction temperature is 2 ° C., for example, when the value is in a range between a certain value and a value smaller than that, for example, when 1.6 ≦ C <1.8, the correction temperature is 4 ° C. and a value smaller than that. In this case, for example, when C <1.6, the correction temperature is 6 ° C. In other words, the smaller the rate of increase, the greater the load, so the larger the correction temperature value, and the larger the rate of increase, the smaller the load, the smaller the correction temperature value, and the temperature rise from the temperature detected by the temperature sensor. The rate is obtained, compared with the temperature increase rate C set in the main control unit, and the range of the above-mentioned correction temperature range corresponding to the value is determined, and the set temperature is increased by the correction temperature of the corresponding range, Control is performed based on the correction set temperature over a predetermined correction duration.

  FIG. 5 is a control system diagram of the fifth embodiment of the present invention, and parts equivalent to those in the embodiment of FIG. That is, in the configuration of the temperature sensors 11, 12,... 1 n and the heaters 21, 22,... 2 n of each product shelf and the main control unit 1, the set temperature T (° C.) and the correction temperature A ( ° C), the product shelf temperature rise rate C is stored in advance and the temperature rise rate detection means is similar, but the correction temperature duration is not a single value, but is divided into a plurality of sections The difference is that it has a value. That is, if the rate of increase C is greater than a certain value, for example, if C ≧ 2, the correction duration is 0 minute, and if the rate of increase C is in a range between a certain value smaller than that and for example, 1.8 ≦ C In the case of <2, the correction duration is, for example, 5 minutes, and in the range between a certain value and a value smaller than that, for example, when 1.6 ≦ C <1.8, the correction duration is 10 minutes and further In the case of a small value, for example, when C <1.6, the correction duration is set to 15 minutes. That is, the smaller the rate of increase, the greater the load, so the value of the correction duration is increased. The higher the rate of increase, the smaller the load, the value of the correction duration is decreased, and the temperature is detected from the temperature detected by the temperature sensor. Is calculated and compared with the temperature increase rate C set in the main control unit, the value is determined to which range of the above-mentioned correction duration range, and only the correction duration of the corresponding range is set. The temperature T is increased by a preset correction temperature A, and control is performed over the corresponding correction duration based on the correction set temperature.

  FIG. 6 is a cross-sectional view of an example of a showcase used in the present invention. This showcase is divided into a case main body 61 made of a heat insulating wall, a product display box 62 having a front opening, and a plurality of stages of product shelves 63 are provided in the box. Inside and outside double ventilation passages 64 and 65 are formed outside the commodity display box 62 and behind the product shelf 63, and as a cooling means, a cooler 66 and a case main body 61 leading to the ventilation passages 64 and 65 are provided in the inner ventilation passage 64. A blower fan 67 is provided in the lower space. Each commodity shelf 63 is provided with a heater 68 and a temperature sensor 69 as heating means, and these are connected to a heater controller (not shown). During the refrigeration operation of the showcase, the refrigerant is supplied to the cooler 66 and the blower fan 67 is driven to circulate and blow air through the inner and outer ventilation paths 64 and 65 and the front opening of the product display 62 and is cooled by the cooler 66. The cooling air cools the merchandise in the merchandise shelf, and the ventilation circulating through the outer ventilation path 65 forms an air curtain at the front opening of the merchandise display cabinet 62 to block the outside air from entering the cabinet. The product temperature during the refrigeration operation can be controlled based on the temperature detected by the temperature sensor 610 provided at the cooling air outlet. In the warming operation, power is supplied to the heater 68 of each product shelf 63 from the heating power supply of the heater controller, the temperature of each product shelf 9 is detected by the temperature sensor 69, and the heater is turned on based on the temperature set by the heater controller. The product is kept at a predetermined temperature by turning it off. Such a showcase structure is generally used in the past, but in the present invention, the above-described rapid pull-up mode control can be performed using the temperature sensor of each commodity shelf.

  Although the present invention has been described with respect to the five embodiments described above, all the embodiments are based on a common technical idea in that the heater is controlled for a predetermined time by correcting the set temperature of the product shelf to a high value, and a rapid pull-up is performed. Initiation is triggered by the switch in the first embodiment, the second embodiment is triggered in conjunction with the refrigeration / warm switching, and the third embodiment is triggered when the rate of increase in the shelf temperature is below a predetermined value. Example 4 triggers when the product shelf temperature rise rate is less than or equal to a predetermined value, and changes the correction temperature stepwise instead of a fixed value. Example 5 triggers when the product shelf temperature rise rate is less than or equal to a predetermined value. Each of the features is that the correction duration is changed in a stepwise manner instead of a constant value.

  In this invention, the correction temperature and the correction time for the set temperature of the product shelf can be determined independently for each product shelf, or can be set to the same value for all the product shelves. It can be appropriately selected depending on conditions.

It is a control system diagram of the 1st and 2nd example of this invention. It is a diagram which shows an example of the temperature-time characteristic of this invention. It is a control system diagram of the 3rd example of this invention. It is a control system diagram of the 4th example of this invention. It is a control system diagram of the 5th example of this invention. It is sectional drawing of an example of the showcase used for this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main control part 2 Rapid pull-up starting switch 3 Refrigeration / warm switching part 11, 12, ... 1n Temperature sensor 21, 22, ... 2n Heater T Set temperature A Correction temperature B Correction duration p1 Temperature sensor detection temperature curve p2 Rapid Temperature sensor detection temperature curve at pull-up startup q1 Product temperature curve q2 Product temperature curve at rapid pull-up startup

Claims (5)

  In a showcase having a product shelf with a built-in heater for product heating and a temperature sensor for heater control, means for activating the product rapid pull-up mode for each product shelf, and adjusting the heater temperature when the rapid pull-up mode is activated A heating control device for a showcase, comprising: means for correcting the temperature higher than a set value for a predetermined time.   In a showcase that has a product shelf with a heater for product heating and a temperature sensor for heater control, and can be switched between refrigeration and refrigeration, the heater temperature control temperature is specified when the refrigeration operation mode is switched to the refrigeration operation mode. A heating control device for a showcase, comprising means for correcting the time higher than a set value.   In a showcase having a product shelf incorporating a product heating heater and a heater control temperature sensor, means for detecting a rate of temperature rise detected by the temperature sensor, and a heater when the detected rate of increase is below a predetermined value A heating control apparatus for a showcase, comprising: means for correcting the temperature control temperature higher than a set value for a predetermined time.   In a showcase having a product shelf incorporating a product heating heater and a heater control temperature sensor, means for detecting the rate of increase in temperature detected by the temperature sensor, and the heater to an optimum value corresponding to the detected rate of increase A heating control device for a showcase, comprising: means for correcting the temperature control temperature for a predetermined time.   In a showcase having a product shelf incorporating a product heating heater and a heater control temperature sensor, means for detecting the rate of increase in temperature detected by the temperature sensor, and the heater for an optimum time according to the detected rate of increase A heating control device for a showcase, comprising: means for correcting the temperature control temperature higher than a set value.

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