JPH10213372A - Method and apparatus for controlling temperature of flat type display case - Google Patents
Method and apparatus for controlling temperature of flat type display caseInfo
- Publication number
- JPH10213372A JPH10213372A JP3133297A JP3133297A JPH10213372A JP H10213372 A JPH10213372 A JP H10213372A JP 3133297 A JP3133297 A JP 3133297A JP 3133297 A JP3133297 A JP 3133297A JP H10213372 A JPH10213372 A JP H10213372A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- sensor
- detected
- flat
- temperature control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Freezers Or Refrigerated Showcases (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、平型ショーケース
の温度制御方法及び装置に関し、詳しくは、平型ショー
ケースの温度制御に影響する輻射熱の影響を考慮した平
型ショーケースの温度制御方法及び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling the temperature of a flat showcase, and more particularly to a method of controlling the temperature of a flat showcase in consideration of the influence of radiant heat affecting the temperature control of the flat showcase. And an apparatus.
【０００２】[0002]
【従来の技術】従来の一般的な平型ショーケースでは、
冷気吹出口や冷気吸込口のいずれか一方に温度センサー
を設け、この温度センサーの検出温度によって温度制御
を行っている。2. Description of the Related Art In a conventional general flat type showcase,
A temperature sensor is provided at one of the cold air outlet and the cold air inlet, and the temperature is controlled by the temperature detected by the temperature sensor.
【０００３】しかし、冷気吹出口あるいは冷気吸込口だ
けの検出温度で平型ショーケースの温度制御を行うと、
輻射熱の影響や周囲環境の影響、例えば、外部からの日
光や店内に設置したスポットライト、天井のダクト等の
影響によって冷気吹出口や冷気吸込口での検出温度と実
際の庫内温度とに差が生じることがあった。[0003] However, if the temperature of the flat showcase is controlled with the detected temperature of only the cool air outlet or the cool air inlet,
The difference between the detected temperature at the cold air outlet or cold air inlet and the actual inside temperature due to the effects of radiant heat and the surrounding environment, for example, the effects of external sunlight, spotlights installed in the store, and ceiling ducts. Sometimes occurred.
【０００４】例えば、庫内温度を−２℃に設定した場
合、輻射熱の影響が無い場合には、冷気吹出口や冷気吸
込口における設定温度を−２℃とし、温度センサーの検
出温度により所定の演算処理を行って目標庫内温度値を
算出し、この目標庫内温度値に基づいて温度制御を行え
ば庫内温度を−２℃に維持することができるが、輻射熱
の影響が有る場合には、冷気吹出口における設定温度を
−２℃にすると、庫内温度は輻射熱の影響で上昇するた
め、庫内を−２℃に維持することができなくなる。した
がって、この場合は、冷気吹出口における設定温度を−
２℃より低くしておく必要がある。[0004] For example, when the temperature in the refrigerator is set to -2 ° C, and when there is no influence of radiant heat, the set temperature at the cool air outlet and the cool air inlet is set to -2 ° C, and a predetermined temperature is detected by a temperature sensor. If the target internal temperature value is calculated by performing arithmetic processing, and the temperature is controlled based on the target internal temperature value, the internal temperature can be maintained at −2 ° C., but when there is an influence of radiant heat, When the set temperature at the cold air outlet is set to −2 ° C., the temperature inside the refrigerator increases due to the influence of radiant heat, so that the interior of the refrigerator cannot be maintained at −2 ° C. Therefore, in this case, the set temperature at the cool air outlet is-
It must be kept below 2 ° C.
【０００５】逆に、冷気吸込口側では、輻射熱の影響で
吸込む冷気の温度が上昇しているため、ここでの設定を
−２℃にすると、庫内温度は−２℃よりも低くなり、冷
気吹出口部分ではかなりの低温となってしまうため、冷
気吸込口における設定温度は高めに設定しておかなけれ
ばならなかった。Conversely, since the temperature of the cold air to be sucked in on the side of the cold air suction port has risen due to the influence of radiant heat, if the setting here is -2 ° C, the temperature in the refrigerator becomes lower than -2 ° C. Since the temperature of the cold air outlet becomes considerably low, the set temperature of the cold air inlet must be set higher.
【０００６】[0006]
【発明が解決しようとする課題】このため、負荷が少な
くなった場合や、夜間のように輻射熱の影響が少なくな
った場合には、冷気吹出口部分と実際の庫内温度との差
が小さくなるため、前述のように、温度センサーが冷気
吹出口部分に設けられて温度設定が低くなっているとき
には、実際の使用温度よりも庫内温度が低くなって過冷
却状態になる問題があった。また、冷気吸込口側で温度
制御を行っている場合にも、同様の問題があった。Therefore, when the load is reduced or when the influence of radiant heat is reduced, such as at night, the difference between the cold air outlet portion and the actual internal temperature is small. Therefore, as described above, when the temperature sensor is provided at the cold air outlet portion and the temperature setting is low, there is a problem that the temperature in the refrigerator is lower than the actual use temperature and a supercooling state is caused. . A similar problem also occurs when temperature control is performed on the side of the cold air inlet.
【０００７】本発明は、上記の問題点に鑑み創案された
もので、その目的とするところは、平型ショーケースの
温度制御に大きな影響を与える輻射熱の影響を排除し、
庫内を所定の冷却温度に制御することができる平型ショ
ーケースの温度制御方法及び装置を提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to eliminate the influence of radiant heat, which greatly affects the temperature control of a flat type showcase,
It is an object of the present invention to provide a temperature control method and apparatus for a flat showcase that can control the inside of a refrigerator to a predetermined cooling temperature.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
め、本発明の平型ショーケースの温度制御方法において
は、平型ショーケースの温度制御に影響する輻射熱を考
慮した演算処理を行うことにより温度制御を行うことを
特徴とするものであって、例えば、冷気吹出口の近傍に
設けられた第１温度センサーと、冷気吸込口の近傍に設
けられた第２温度センサーとの温度差に基づいて輻射熱
の影響を考慮した温度制御演算を行うことにより目標庫
内温度値を補正し、該目標庫内温度値に基づいて温度制
御を行う。In order to achieve the above object, in the method of controlling the temperature of a flat showcase of the present invention, an arithmetic processing is performed in consideration of radiant heat which affects the temperature control of the flat showcase. A temperature difference between a first temperature sensor provided near the cool air outlet and a second temperature sensor provided near the cool air inlet, for example. The target internal temperature value is corrected by performing a temperature control calculation in consideration of the influence of radiant heat based on the target internal temperature value, and the temperature is controlled based on the target internal temperature value.
【０００９】また、前記第１温度センサーの検出温度
と、第２温度センサーの検出温度との温度差に基づいて
温度制御演算を行うことにより目標庫内温度値を補正
し、該補正した目標庫内温度値に基づいて温度制御を行
い、前記温度差が所定以上に大きい場合、例えば、平型
ショーケースのロードライン以上に商品を入れて正常な
冷気の循環が阻害された場合には、第２温度センサーの
検出温度を無視して、第１温度センサーの検出温度のみ
で温度制御を行い、冷気吹出口近傍の商品が過冷却状態
になることを防止する。In addition, the target internal temperature value is corrected by performing a temperature control operation based on a temperature difference between the detected temperature of the first temperature sensor and the detected temperature of the second temperature sensor. When the temperature control is performed based on the internal temperature value, and the temperature difference is greater than a predetermined value, for example, when a product is placed above a load line of a flat showcase and normal circulation of cool air is inhibited, The temperature control is performed only by the temperature detected by the first temperature sensor, ignoring the temperature detected by the second temperature sensor, to prevent a product near the cool air outlet from being supercooled.
【００１０】あるいは、庫内温度を検出する少なくとも
１個の庫内温度センサーと、外部からの輻射熱を検出す
る輻射熱センサーとが設けられ、輻射熱センサーの検出
温度と庫内温度センサーの検出温度とにより目標庫内温
度値を補正し、該補正した目標庫内温度値に基づいて温
度制御する。あるいは、複数の温度センサーを有し、複
数の温度サンサーが接続されている場合には、該複数の
温度センサーの温度差に基づいて温度制御演算を行うこ
とにより目標庫内温度値を補正し、該補正した目標庫内
温度値に基づいて温度制御を行い、断線又は短絡状態の
温度センサーがある場合は、該温度センサーを除いて他
の温度センサーの検出温度に応じて温度制御を行うよう
にする。[0010] Alternatively, at least one internal temperature sensor for detecting the internal temperature and a radiant heat sensor for detecting radiant heat from the outside are provided, and the temperature is determined by the detected temperature of the radiant heat sensor and the detected temperature of the internal temperature sensor. The target internal temperature value is corrected, and the temperature is controlled based on the corrected target internal temperature value. Alternatively, when a plurality of temperature sensors are connected and a plurality of temperature sensors are connected, the target internal temperature value is corrected by performing a temperature control calculation based on a temperature difference between the plurality of temperature sensors, Temperature control is performed based on the corrected target internal temperature value, and if there is a disconnected or short-circuited temperature sensor, the temperature control is performed according to the detected temperature of another temperature sensor excluding the temperature sensor. I do.
【００１１】また、本発明の平型ショーケースの温度制
御装置は、複数の温度センサーを備えるとともに、該複
数の温度センサーの検出温度に基づいて目標庫内温度値
を補正する演算手段を備えている。あるいは、少なくと
も１個の庫内温度センサーと輻射熱センサーとを備える
とともに、庫内温度センサーの検出温度と輻射熱センサ
ーの検出温度とに基づいて目標庫内温度値を補正する演
算手段を備えている。The temperature control device for a flat-type showcase according to the present invention includes a plurality of temperature sensors and a calculating means for correcting a target internal temperature value based on the detected temperatures of the plurality of temperature sensors. I have. Alternatively, at least one internal temperature sensor and a radiant heat sensor are provided, and arithmetic means for correcting a target internal temperature value based on the detected temperature of the internal temperature sensor and the detected temperature of the radiant heat sensor is provided.
【００１２】[0012]
【発明の実施の形態】以下、本発明の好ましい実施の形
態を図面に基づき詳細に説明する。図１は本発明を適用
した平型ショーケースの概略断面図、図２は制御方法の
一例を示すフローチャート、図３は制御方法の他の例を
示すフローチャート、図４は輻射補正係数の算出例を示
すもので、輻射熱センサーの検出温度から吹出側温度セ
ンサーの検出温度を引いた温度差と輻射補正係数との関
係を示す図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a schematic cross-sectional view of a flat showcase to which the present invention is applied, FIG. 2 is a flowchart illustrating an example of a control method, FIG. 3 is a flowchart illustrating another example of a control method, and FIG. 4 is a calculation example of a radiation correction coefficient. FIG. 4 is a diagram showing a relationship between a temperature difference obtained by subtracting a temperature detected by a blow-off-side temperature sensor from a temperature detected by a radiation heat sensor and a radiation correction coefficient.
【００１３】まず、図１に示すように、本発明の対象と
なる平型ショーケース１は、商品陳列部２の底部に冷却
器等を設置した冷却通路３を設け、商品陳列部２の一側
に冷気吹出口４を、これに対向する部分に冷気吸込口５
を設けたものである。本発明においては、このような平
型ショーケース１の冷気吹出口４の近傍に第１の温度セ
ンサーである吹出側温度センサー１１を設け、冷気吸込
口５の冷気通路６内に第２の温度センサーである吸込側
温度センサー１２を設けるとともに、商品陳列部２の上
部の庫内とは隔絶された位置に第３の温度センサーであ
る輻射熱センサー１３を設けている。First, as shown in FIG. 1, a flat showcase 1 to which the present invention is applied is provided with a cooling passage 3 in which a cooler or the like is installed at the bottom of a product display unit 2. Side is provided with a cool air outlet 4, and a cold air inlet 5 is provided at a portion opposed thereto.
Is provided. In the present invention, an outlet-side temperature sensor 11, which is a first temperature sensor, is provided in the vicinity of the cool air outlet 4 of such a flat showcase 1, and the second temperature is provided in the cool air passage 6 of the cool air inlet 5. A suction-side temperature sensor 12, which is a sensor, is provided, and a radiant heat sensor 13, which is a third temperature sensor, is provided at a position above the product display section 2 and separated from the inside of the refrigerator.
【００１４】ここで、上記吹出側温度センサー１１を主
な制御用センサーとして用いた場合の温度制御について
説明する。すなわち、吹出側温度センサー１１の検出温
度を基準にして温度制御を行う場合について説明する。
なお、冷却運転の制御や除霜運転の制御については、従
来と同様にして行うことができるので、ここでは、輻射
熱の影響を補正するための制御方法についてのみ説明す
る。Here, a description will be given of the temperature control in the case where the blow-out-side temperature sensor 11 is used as a main control sensor. That is, a case will be described in which the temperature control is performed based on the detection temperature of the blow-out temperature sensor 11.
Since the control of the cooling operation and the control of the defrosting operation can be performed in the same manner as in the related art, only the control method for correcting the influence of the radiant heat will be described here.
【００１５】最初に、輻射熱センサー１３を設けていな
い場合は、図２に示すように、吹出側温度センサー１１
の検出温度Ｔｆと吸込側温度センサー１２の検出温度Ｔ
ｂとにより温度制御演算を行い、これによって温度セン
サーの検出温度あるいは目標庫内温度値を補正して温度
制御を行う。まず、ステップ２１で吹出側温度センサー
１１の検出温度Ｔｆと吸込側温度センサー１２の検出温
度Ｔｂとを比較し、これが等しいか吹出側温度センサー
１１の検出温度Ｔｆが吸込側温度センサー１２の検出温
度Ｔｂより高い場合には、輻射熱の影響が無い状態であ
るから、ステップ２２に進んで目標庫内温度値Ｔｓと吹
出側温度センサー１１の検出温度Ｔｆとが等しくなるよ
うに温度制御を行う。例えば、目標庫内温度値Ｔｓが−
２℃の場合には、吹出側温度センサー１１の検出温度Ｔ
ｆが−２℃になるように冷却運転の制御を行う。First, when the radiant heat sensor 13 is not provided, as shown in FIG.
And the detected temperature T of the suction side temperature sensor 12
b, a temperature control calculation is performed, thereby correcting the detected temperature of the temperature sensor or the target internal temperature value to perform the temperature control. First, in step 21, the detected temperature Tf of the outlet-side temperature sensor 11 is compared with the detected temperature Tb of the inlet-side temperature sensor 12, and is equal to or equal to the detected temperature Tf of the outlet-side temperature sensor 11. If the temperature is higher than Tb, there is no influence of the radiant heat. Therefore, the process proceeds to step 22, and the temperature control is performed so that the target internal temperature Ts and the temperature Tf detected by the blow-out temperature sensor 11 become equal. For example, if the target internal temperature value Ts is −
In the case of 2 ° C., the detected temperature T of the outlet-side temperature sensor 11
The cooling operation is controlled so that f becomes −2 ° C.
【００１６】ステップ２１の条件を満たさない場合、す
なわち、吸込側温度センサー１２の検出温度Ｔｂが吹出
側温度センサー１１の検出温度Ｔｆより高い場合には、
ステップ２３に進んで検出温度Ｔｂと検出温度Ｔｆとの
温度差ΔＴを算出し、この温度差ΔＴが５℃以下の場合
には、ステップ２４に進み、吹出側温度センサー１１の
検出温度Ｔｆに温度差ΔＴの１／２の温度を加え（Ｔｆ
＋ΔＴ／２）、これが目標庫内温度値Ｔｓと等しくなる
ように冷却運転を行う。例えば、目標庫内温度値Ｔｓが
−２℃で、温度差ΔＴが４℃の場合は、吹出側温度セン
サー１１の検出温度Ｔｆに２℃を加えた値が目標庫内温
度値Ｔｓに等しくなるように、すなわち、検出温度Ｔｆ
が−４℃になるように冷却運転を制御する。逆にいえ
ば、目標庫内温度値Ｔｓを−４℃に補正した状態とな
る。If the condition of step 21 is not satisfied, that is, if the detected temperature Tb of the suction-side temperature sensor 12 is higher than the detected temperature Tf of the outlet-side temperature sensor 11,
Proceeding to step 23, the temperature difference ΔT between the detected temperature Tb and the detected temperature Tf is calculated. If this temperature difference ΔT is 5 ° C. or less, the process proceeds to step 24, where the detected temperature Tf The temperature of 1/2 of the difference ΔT is added (Tf
+ ΔT / 2), and the cooling operation is performed so that this becomes equal to the target in-compartment temperature value Ts. For example, when the target internal temperature Ts is −2 ° C. and the temperature difference ΔT is 4 ° C., a value obtained by adding 2 ° C. to the temperature Tf detected by the blowout-side temperature sensor 11 becomes equal to the target internal temperature Ts. That is, the detected temperature Tf
The cooling operation is controlled so that the temperature becomes −4 ° C. Conversely, a state is obtained in which the target internal temperature value Ts is corrected to −4 ° C.
【００１７】ステップ２３で算出した温度差ΔＴが５℃
を超える場合には、ステップ２５に進んで温度差ΔＴが
１０℃以下かどうかを判別する。その結果、温度差ΔＴ
が５℃を超え、１０℃以下の場合には、ステップ２６に
進み、吹出側温度センサー１１の検出温度Ｔｆに温度差
ΔＴの１／２の温度を加え、さらに２℃を加えた温度
（Ｔｆ＋ΔＴ／２＋２）が目標庫内温度値Ｔｓと等しく
なるように冷却運転を行う。例えば、目標庫内温度値Ｔ
ｓが−２℃で、温度差ΔＴが８℃の場合は、吹出側温度
センサー１１の検出温度Ｔｆに４℃とあらかじめ設定し
た定数である２℃とを加えた値が目標庫内温度値Ｔｓに
等しくなるように、すなわち、検出温度Ｔｆが−８℃に
なるように冷却運転を制御する。逆にいえば、目標庫内
温度値Ｔｓを−８℃に補正した状態となる。The temperature difference ΔT calculated in step 23 is 5 ° C.
If it exceeds, the routine proceeds to step 25, where it is determined whether the temperature difference ΔT is 10 ° C. or less. As a result, the temperature difference ΔT
If the temperature exceeds 5 ° C. and is equal to or lower than 10 ° C., the process proceeds to step 26, where a temperature equal to １ ／ of the temperature difference ΔT is added to the temperature Tf detected by the blowing-side temperature sensor 11, and a temperature (Tf + ΔT) obtained by adding 2 ° C. / 2 + 2) is performed to make the cooling operation equal to the target internal temperature value Ts. For example, the target internal temperature value T
If s is −2 ° C. and the temperature difference ΔT is 8 ° C., a value obtained by adding 4 ° C. and 2 ° C., which is a preset constant, to the temperature Tf detected by the blowing-side temperature sensor 11 is a target internal temperature value Ts. That is, the cooling operation is controlled so that the detected temperature Tf becomes −8 ° C. Conversely, a state is obtained in which the target internal temperature value Ts is corrected to -8 ° C.
【００１８】前記温度差ΔＴが１０℃を超える場合は、
ステップ２７で、吸込側温度センサー１２の検出温度Ｔ
ｂに関係なく、すなわち、温度差ΔＴを無視して吹出側
温度センサー１１の検出温度Ｔｆに７℃を加えた値（Ｔ
ｆ＋７）が目標庫内温度値Ｔｓに等しくなるように冷却
運転を行う。例えば、目標庫内温度値Ｔｓが−２℃の場
合には、検出温度Ｔｆが−９℃になるように冷却運転を
制御する。逆にいえば、目標庫内温度値Ｔｓを−９℃に
補正した状態となる。When the temperature difference ΔT exceeds 10 ° C.,
In step 27, the detected temperature T of the suction side temperature sensor 12
b, that is, a value obtained by adding 7 ° C. to the detected temperature Tf of the outlet-side temperature sensor 11 ignoring the temperature difference ΔT (T
The cooling operation is performed so that (f + 7) becomes equal to the target internal temperature Ts. For example, when the target internal temperature Ts is −2 ° C., the cooling operation is controlled so that the detected temperature Tf becomes −9 ° C. Conversely, a state in which the target internal temperature Ts is corrected to −9 ° C.
【００１９】このように、吹出側温度センサー１１の検
出温度Ｔｆと吸込側温度センサー１２の検出温度Ｔｂと
を比較し、その温度差に応じて冷却運転を制御すること
により、平型ショーケースにおける輻射熱の影響を小さ
くすることができ、庫内温度を設定温度近くに維持する
ことができる。また、夜間やナイトカバー装着時のよう
に輻射熱の影響がほとんど無い場合には、検出温度Ｔｆ
と検出温度Ｔｂとの温度差ΔＴが小さくなり、制御温度
の補正量も小さくなるので、従来のような温度低下や温
度上昇を生じることがなくなる。As described above, the detected temperature Tf of the outlet-side temperature sensor 11 is compared with the detected temperature Tb of the inlet-side temperature sensor 12, and the cooling operation is controlled in accordance with the temperature difference. The influence of radiant heat can be reduced, and the internal temperature can be maintained near the set temperature. Further, when there is almost no influence of radiant heat, such as at night or when a night cover is attached, the detection temperature Tf
The temperature difference ΔT between the control temperature and the detected temperature Tb is reduced, and the correction amount of the control temperature is also reduced, so that the conventional temperature drop or temperature rise does not occur.
【００２０】次に、図３及び図４に基づいて、輻射熱セ
ンサー１３を含めた場合の温度制御を説明する。まず、
ステップ３１で吹出側温度センサー１１の検出温度Ｔｆ
と吸込側温度センサー１２の検出温度Ｔｂとを比較し、
これが等しいか吹出側温度センサー１１の検出温度Ｔｆ
が吸込側温度センサー１２の検出温度Ｔｂより高い場合
にはステップ３２に進み、吹出側温度センサー１１の検
出温度Ｔｆに、輻射熱センサー１３の検出温度に基づい
た輻射補正係数Ａを加え（Ｔｆ＋Ａ）、これが目標庫内
温度値Ｔｓと等しくなるように冷却運転を行う。Next, the temperature control when the radiant heat sensor 13 is included will be described with reference to FIGS. First,
In step 31, the detected temperature Tf of the outlet-side temperature sensor 11
And the detected temperature Tb of the suction side temperature sensor 12 are compared,
Equal to or equal to the detected temperature Tf of the outlet-side temperature sensor 11
If is higher than the detected temperature Tb of the suction-side temperature sensor 12, the process proceeds to step 32, and a radiation correction coefficient A based on the detected temperature of the radiant heat sensor 13 is added to the detected temperature Tf of the outlet-side temperature sensor 11 (Tf + A), The cooling operation is performed so that this becomes equal to the target internal temperature value Ts.
【００２１】この場合、庫内の冷気に対する輻射熱の影
響はほとんど無い状態であるが、日光やスポットライト
等からの輻射熱によって庫内に陳列した商品の表面温度
が上昇することがあるため、輻射熱を考慮して温度補正
を行う。この輻射熱センサー１３の検出温度に基づいた
輻射補正係数Ａは、図４に示すように、輻射熱センサー
１３の検出温度から吹出側温度センサー１１の検出温度
Ｔｆを引いた温度差によってあらかじめ設定されてお
り、この温度差が０乃至その前後のときには輻射補正係
数Ａを０とし、温度差が大きいときには輻射補正係数Ａ
を大きくし、また、温度差がマイナスのとき、すなわ
ち、輻射熱センサー１３の検出温度が吹出側温度センサ
ー１１の検出温度Ｔｆより低いときには、輻射補正係数
Ａもマイナスの値になるようにしている。In this case, the radiant heat has almost no effect on the cool air in the refrigerator. However, since the surface temperature of the products displayed in the refrigerator may increase due to the radiant heat from sunlight or spotlights, the radiant heat may be reduced. The temperature is corrected in consideration of the above. As shown in FIG. 4, the radiation correction coefficient A based on the temperature detected by the radiation heat sensor 13 is set in advance by a temperature difference obtained by subtracting the detection temperature Tf of the blow-out side temperature sensor 11 from the temperature detected by the radiation heat sensor 13. The radiation correction coefficient A is set to 0 when the temperature difference is 0 or before and after the temperature difference, and the radiation correction coefficient A is set when the temperature difference is large.
And when the temperature difference is negative, that is, when the detected temperature of the radiant heat sensor 13 is lower than the detected temperature Tf of the blow-out side temperature sensor 11, the radiation correction coefficient A is also set to a negative value.
【００２２】例えば、目標庫内温度値Ｔｓが−２℃で、
輻射熱センサー１３の検出温度から吹出側温度センサー
１１の検出温度Ｔｆを引いた温度差が０のときには、吹
出側温度センサー１１の検出温度Ｔｆが−２℃になるよ
うに冷却運転の制御を行い、輻射熱センサー１３の検出
温度から吹出側温度センサー１１の検出温度Ｔｆを引い
た温度差が＋２０℃程度の場合には、輻射補正係数Ａを
約１℃とし、吹出側温度センサー１１の検出温度Ｔｆが
約−３℃になるように冷却運転の制御を行う。For example, if the target internal temperature value Ts is -2 ° C.,
When the temperature difference obtained by subtracting the detected temperature Tf of the blow-out temperature sensor 11 from the detected temperature of the radiant heat sensor 13 is 0, the cooling operation is controlled so that the detected temperature Tf of the blow-out temperature sensor 11 becomes −2 ° C. When the temperature difference obtained by subtracting the detected temperature Tf of the blow-out temperature sensor 11 from the detected temperature of the radiant heat sensor 13 is about + 20 ° C., the radiation correction coefficient A is set to about 1 ° C., and the detected temperature Tf of the blow-out temperature sensor 11 becomes The cooling operation is controlled so as to be about −3 ° C.
【００２３】ステップ３１の条件を満たさない場合、す
なわち、吸込側温度センサー１２の検出温度Ｔｂが吹出
側温度センサー１１の検出温度Ｔｆより高い場合には、
ステップ３３に進んで検出温度Ｔｂと検出温度Ｔｆとの
温度差ΔＴを算出し、この温度差ΔＴが５℃以下の場合
には、ステップ３４に進み、吹出側温度センサー１１の
検出温度Ｔｆに温度差ΔＴの１／２の温度と前記輻射補
正係数Ａとを加え（Ｔｆ＋ΔＴ／２＋Ａ）、これが目標
庫内温度値Ｔｓと等しくなるように冷却運転を行う。例
えば、目標庫内温度値Ｔｓが−２℃で、温度差ΔＴが４
℃、輻射熱センサー１３の検出温度から吹出側温度セン
サー１１の検出温度Ｔｆを引いた温度差が＋２０℃程度
の場合には、吹出側温度センサー１１の検出温度Ｔｆに
２℃を加え、さらに輻射補正係数Ａの約１℃を加えた値
が目標庫内温度値Ｔｓに等しくなるように、すなわち、
検出温度Ｔｆが−５℃になるように冷却運転を制御す
る。逆にいえば、目標庫内温度値Ｔｓを−５℃に補正し
た状態となる。If the condition of step 31 is not satisfied, that is, if the detected temperature Tb of the suction-side temperature sensor 12 is higher than the detected temperature Tf of the outlet-side temperature sensor 11,
Proceeding to step 33, the temperature difference ΔT between the detected temperature Tb and the detected temperature Tf is calculated. If this temperature difference ΔT is 5 ° C. or less, the process proceeds to step 34, where the detected temperature Tf The cooling operation is performed such that the temperature of 1/2 of the difference ΔT and the radiation correction coefficient A are added (Tf + ΔT / 2 + A), and this becomes equal to the target in-compartment temperature value Ts. For example, if the target internal temperature value Ts is −2 ° C. and the temperature difference ΔT is 4
When the temperature difference obtained by subtracting the detected temperature Tf of the blow-out temperature sensor 11 from the detected temperature of the radiant heat sensor 13 is about + 20 ° C., 2 ° C. is added to the detected temperature Tf of the blow-out temperature sensor 11, and radiation correction is further performed. The value obtained by adding the coefficient A to about 1 ° C. is equal to the target internal temperature value Ts, that is,
The cooling operation is controlled so that the detected temperature Tf becomes −5 ° C. Conversely, a state in which the target internal temperature value Ts is corrected to −5 ° C.
【００２４】ステップ３３で算出した温度差ΔＴが５℃
を超える場合には、ステップ３５に進んで温度差ΔＴが
１０℃以下かどうかを判別し、温度差ΔＴが５℃を超
え、１０℃以下の場合にはステップ３６に進む。このス
テップ３６では、吹出側温度センサー１１の検出温度Ｔ
ｆに、温度差ΔＴの１／２の温度と、あらかじめ設定し
た定数である２℃と、前記輻射補正係数Ａとを加えた温
度（Ｔｆ＋ΔＴ／２＋２＋Ａ）が目標庫内温度値Ｔｓと
等しくなるように冷却運転を行う。例えば、目標庫内温
度値Ｔｓが−２℃、温度差ΔＴが８℃であって、輻射補
正係数Ａが前記同様に約１℃の場合は、吹出側温度セン
サー１１の検出温度Ｔｆに４℃と２℃と１℃を加えた値
が目標庫内温度値Ｔｓに等しくなるように、すなわち、
検出温度Ｔｆが−９℃になるように冷却運転を制御す
る。逆にいえば、目標庫内温度値Ｔｓを−９℃に補正し
た状態となる。The temperature difference ΔT calculated in step 33 is 5 ° C.
If the temperature difference ΔT exceeds 10 ° C., the process proceeds to step 36. If the temperature difference ΔT is less than 10 ° C., the process proceeds to step 36. In this step 36, the detected temperature T of the blow-out temperature sensor 11 is set.
The temperature (Tf + ΔT / 2 + 2 + A) obtained by adding the temperature of f to １ ／ of the temperature difference ΔT, a predetermined constant of 2 ° C., and the radiation correction coefficient A is equal to the target internal temperature Ts. Perform cooling operation. For example, when the target internal temperature Ts is −2 ° C., the temperature difference ΔT is 8 ° C., and the radiation correction coefficient A is about 1 ° C. as described above, the detected temperature Tf of the blow-out side temperature sensor 11 is 4 ° C. And a value obtained by adding 2 ° C. and 1 ° C. becomes equal to the target internal temperature value Ts, that is,
The cooling operation is controlled so that the detected temperature Tf becomes −9 ° C. Conversely, a state in which the target internal temperature Ts is corrected to −9 ° C.
【００２５】前記温度差ΔＴが１０℃を超える場合は、
ステップ３７で吹出側温度センサー１１の検出温度Ｔｆ
に７℃と輻射補正係数Ａとを加えた値が目標庫内温度値
Ｔｓに等しくなるように冷却運転を行う。例えば、目標
庫内温度値Ｔｓが−２℃で輻射補正係数Ａが前記同様に
約１℃の場合には、検出温度Ｔｆが−１０℃になるよう
に冷却運転を制御する。逆にいえば、目標庫内温度値Ｔ
ｓを−１０℃に補正した状態となる。When the temperature difference ΔT exceeds 10 ° C.,
In step 37, the detected temperature Tf of the outlet-side temperature sensor 11
The cooling operation is performed so that the value obtained by adding 7 ° C. and the radiation correction coefficient A to the target internal temperature value Ts becomes equal to the target internal temperature value Ts. For example, when the target internal temperature Ts is −2 ° C. and the radiation correction coefficient A is about 1 ° C. as described above, the cooling operation is controlled so that the detected temperature Tf becomes −10 ° C. Conversely, the target internal temperature value T
s is corrected to −10 ° C.
【００２６】このように、平型ショーケースに輻射熱セ
ンサー１３を設けて温度制御に用いることにより、照明
等によって商品の表面温度が上昇することを防止でき、
鮮度維持等に効果を発揮する。さらに、上述のように、
吹出側温度センサー１１及び吸込側温度センサー１２と
輻射熱センサー１３とを組合わせることにより、庫内温
度を所定の温度に維持しながら表面温度の上昇を防止す
ることができ、さらに確実な温度制御を行うことができ
る。Thus, by providing the radiant heat sensor 13 on the flat type showcase and using it for temperature control, it is possible to prevent the surface temperature of the product from rising due to lighting or the like.
Effective for maintaining freshness. Further, as described above,
By combining the outlet side temperature sensor 11 and the inlet side temperature sensor 12 with the radiant heat sensor 13, it is possible to prevent the surface temperature from rising while maintaining the inside temperature at a predetermined temperature, and to perform more reliable temperature control. It can be carried out.
【００２７】また、温度制御用の温度センサーを庫内に
１個だけ設けて冷却運転を制御する場合でも、輻射熱セ
ンサーを設けて輻射熱量を検出し、この検出温度に基づ
いて温度補正を行うだけでも、従来よりは確実に庫内温
度や商品温度を維持することができる。さらに、吹出側
温度センサー１１と吸込側温度センサー１２とのよう
に、温度センサーを複数個設けた場合、これら複数の温
度センサーが正常に接続されている場合には、これらの
複数の温度センサーの検出温度によって前述のような温
度補正演算を行い、断線又は短絡状態の温度センサーが
ある場合は、該温度センサーを除いて他の温度センサー
の検出温度で、特に、１個の温度センサーだけが正常に
接続された状態になったときには、この１個の温度セン
サーのみで温度制御を行うように設定しておくことによ
り、庫内温度が過冷却状態になったり上昇したりするこ
とを防止できる。Even when only one temperature sensor for temperature control is provided in the refrigerator to control the cooling operation, a radiant heat sensor is provided to detect the amount of radiant heat, and the temperature is corrected based on the detected temperature. However, the internal temperature and the product temperature can be maintained more reliably than before. Furthermore, when a plurality of temperature sensors are provided, such as the outlet-side temperature sensor 11 and the suction-side temperature sensor 12, when the plurality of temperature sensors are connected normally, the Performs the above-mentioned temperature correction calculation based on the detected temperature, and if there is a disconnected or short-circuited temperature sensor, the detected temperature of the other temperature sensors excluding this temperature sensor, especially only one temperature sensor is normal By setting so that the temperature control is performed only by this one temperature sensor when the state is connected to the, it is possible to prevent the temperature in the refrigerator from becoming a supercooled state or rising.
【００２８】また、前述のように、吹出側温度センサー
１１の検出温度Ｔｆを主な制御用センサーとして用いた
場合、従来は、輻射熱の影響を考慮して温度設定値を低
めに設定する必要があり、例えば、庫内温度を−２℃に
したいときには、温度設定値を−４℃等にする必要があ
り、庫内温度や設置状況に応じて変える必要があった
が、本発明では、温度設定値を庫内温度と同じ温度に設
定するだけでよく、自動的に温度補正が行われるので、
庫内温度変更等の操作を極めて容易に行うことができ
る。As described above, when the detected temperature Tf of the outlet-side temperature sensor 11 is used as a main control sensor, conventionally, it is necessary to set a lower temperature set value in consideration of the influence of radiant heat. For example, when it is desired to set the internal temperature to −2 ° C., it is necessary to set the temperature to −4 ° C. or the like, and it is necessary to change the temperature according to the internal temperature or the installation situation. It is only necessary to set the set value to the same temperature as the inside temperature, and the temperature is automatically corrected,
Operations such as changing the temperature in the refrigerator can be performed extremely easily.
【００２９】さらに、目標庫内温度値は、従来から知ら
れているように、環境や負荷の変動等による庫内温度の
変動に対して温度設定値から自動的に演算されるもので
あり、庫内温度を所定温度に維持できるように目標庫内
温度値が決定されるため、これに上述の輻射熱による補
正を加えても、庫内温度が大きく変動することはなく、
庫内を所定の温度範囲内に維持することができる。Further, as conventionally known, the target internal temperature value is automatically calculated from a temperature set value with respect to a change in the internal temperature due to a change in environment or load. Since the target internal temperature value is determined so that the internal temperature can be maintained at the predetermined temperature, even if the above-described correction by the radiant heat is added, the internal temperature does not greatly change,
The interior of the refrigerator can be maintained within a predetermined temperature range.
【００３０】また、平型ショーケースのロードライン以
上に商品を入れた場合のように、正常な冷気の循環が阻
害された場合には、吹出側温度センサー１１の検出温度
Ｔｆと吸込側温度センサー１２の検出温度Ｔｂとに大き
な温度差を生じるので、例えば１０℃以上の温度差があ
った場合には、前記図２におけるステップ２７に示すよ
うに、吸込側温度センサー１２の検出温度Ｔｂを無視し
て吹出側温度センサー１１の検出温度Ｔｆのみにより制
御を行うことにより、冷気吹出口近傍の商品が過冷却状
態になることを防止できる。When normal circulation of cool air is obstructed, as in the case where a product is placed above the load line of a flat-type showcase, the temperature Tf detected by the outlet-side temperature sensor 11 and the temperature detected by the inlet-side temperature sensor are determined. Since the detected temperature Tb of the suction side temperature sensor 12 is large, for example, when there is a temperature difference of 10 ° C. or more, the detected temperature Tb of the suction side temperature sensor 12 is ignored as shown in step 27 in FIG. By performing the control only by the detected temperature Tf of the blow-out temperature sensor 11, it is possible to prevent a product near the cool air outlet from being supercooled.
【００３１】さらに、ナイトカバーを装着した場合のよ
うに輻射熱がほとんどなくなったときには、各温度セン
サーや輻射熱センサーの検出温度によって判別すること
ができるので（図２におけるステップ２１、図３におけ
るステップ３１）、ナイトカバー装着時に庫内温度が低
くなったり高くなったりすることもない。Further, when the radiant heat has almost disappeared, as in the case where the night cover is attached, it is possible to make a determination based on the temperature detected by each temperature sensor or the radiant heat sensor (step 21 in FIG. 2, step 31 in FIG. 3). In addition, when the night cover is attached, the internal temperature does not decrease or increase.
【００３２】[0032]
【発明の効果】以上説明したように、本発明の平型ショ
ーケースの温度制御方法及び装置によれば、実際の使用
温度をそのまま温度設定値として用いることができるの
で、例えばスポットライトの状況等に応じて温度設定値
を変更する必要がなくなり、温度設定操作が容易になる
だけでなく、確実な温度制御を行うことができる。これ
により、冷気吹出口近傍の商品の過冷却等を防止でき、
ナイトカバー装着時の庫内温度の低下等も防止できる。
特に、輻射熱センサーを設けることにより、輻射熱によ
る商品表面温度の上昇にも対応することができる。As described above, according to the method and the apparatus for controlling the temperature of the flat showcase of the present invention, the actual operating temperature can be used as it is as the temperature setting value. Therefore, it is not necessary to change the temperature set value in accordance with the above, not only the temperature setting operation becomes easy, but also reliable temperature control can be performed. Thereby, it is possible to prevent the product near the cool air outlet from being supercooled, etc.
It is also possible to prevent a decrease in the internal temperature when the night cover is attached.
In particular, by providing a radiant heat sensor, it is possible to cope with an increase in the product surface temperature due to radiant heat.
【図１】本発明を適用した平型ショーケースの概略断面
図である。FIG. 1 is a schematic sectional view of a flat showcase to which the present invention is applied.
【図２】本発明の制御方法の一例を示すフローチャート
である。FIG. 2 is a flowchart illustrating an example of a control method according to the present invention.
【図３】本発明の他の制御方法を示すフローチャートで
ある。FIG. 3 is a flowchart showing another control method of the present invention.
【図４】本発明の輻射熱センサーの検出温度から吹出側
温度センサーの検出温度を引いた温度差と輻射補正係数
との関係を示す図である。FIG. 4 is a diagram showing a relationship between a temperature difference obtained by subtracting a detected temperature of a blowing-side temperature sensor from a detected temperature of a radiant heat sensor of the present invention and a radiation correction coefficient.
１ 平型ショーケース ２ 商品陳列部 ３ 冷却通路 ４ 冷気吹出口 ５ 冷気吸込口 ６ 冷気通路 １１ 吹出側温度センサー １２ 吸込側温度センサー １３ 輻射熱センサー DESCRIPTION OF SYMBOLS 1 Flat-type showcase 2 Commodity display part 3 Cooling passage 4 Cold air outlet 5 Cold air inlet 6 Cold air passage 11 Blow-side temperature sensor 12 Suction-side temperature sensor 13 Radiation heat sensor
Claims (7)
て、該平型ショーケースの温度制御に影響する輻射熱を
考慮した演算処理を行うことにより温度制御を行うこと
を特徴とする平型ショーケースの温度制御方法。1. A temperature control method for a flat showcase, wherein the temperature control is performed by performing an arithmetic process in consideration of radiant heat affecting the temperature control of the flat showcase. Temperature control method.
て、冷気吹出口の近傍に設けられた第１温度センサー
と、冷気吸込口の近傍に設けられた第２温度センサーと
の温度差に基づいて温度制御演算を行うことにより目標
庫内温度値を補正し、該補正した目標庫内温度値に基づ
いて温度制御することを特徴とする平型ショーケースの
温度制御方法。2. A temperature control method for a flat-type showcase, wherein a temperature difference between a first temperature sensor provided near a cool air outlet and a second temperature sensor provided near a cool air inlet is determined. A temperature control method for a flat-type showcase, wherein a target internal temperature value is corrected by performing a temperature control operation, and the temperature is controlled based on the corrected target internal temperature value.
て、冷気吹出口の近傍に設けられた第１温度センサーの
検出温度と、冷気吸込口の近傍に設けられた第２温度セ
ンサーの検出温度との温度差に基づいて温度制御演算を
行うことにより目標庫内温度値を補正し、該補正した目
標庫内温度値に基づいて温度制御を行い、前記温度差が
所定以上に大きい場合には、第２温度センサーの検出温
度を無視して、第１温度センサーの検出温度のみで温度
制御を行うことを特徴とする平型ショーケースの温度制
御方法。3. A temperature control method for a flat-type showcase, wherein a detected temperature of a first temperature sensor provided near a cool air outlet and a detected temperature of a second temperature sensor provided near a cool air inlet are provided. Correcting the target internal temperature value by performing a temperature control calculation based on the temperature difference of, performing temperature control based on the corrected target internal temperature value, if the temperature difference is larger than a predetermined, A temperature control method for a flat-type showcase, wherein the temperature control is performed only with the temperature detected by the first temperature sensor, ignoring the temperature detected by the second temperature sensor.
て、庫内温度を検出する少なくとも１個の庫内温度セン
サーと、外部からの輻射熱を検出する輻射熱センサーと
が設けられ、輻射熱センサーの検出温度と庫内温度セン
サーの検出温度とによって温度制御演算を行うことによ
り目標庫内温度値を補正し、該補正した目標庫内温度値
に基づいて温度制御することを特徴とする平型ショーケ
ースの温度制御方法。4. A temperature control method for a flat-type showcase, wherein at least one internal temperature sensor for detecting an internal temperature and a radiant heat sensor for detecting external radiant heat are provided. A flat showcase characterized in that the target internal temperature value is corrected by performing a temperature control operation based on the detected temperature of the internal temperature sensor and the temperature detected by the internal temperature sensor, and the temperature is controlled based on the corrected target internal temperature value. Temperature control method.
て、複数の温度センサーを有し、複数の温度センサーが
接続されている場合には、該複数の温度センサーの温度
差に基づいて温度制御演算を行うことにより目標庫内温
度値を補正し、該補正した目標庫内温度値に基づいて温
度制御を行い、断線又は短絡状態の温度センサーがある
場合は、該温度センサーを除いて他の温度センサーの検
出温度に応じて温度制御を行うことを特徴とする平型シ
ョーケースの温度制御方法。5. A temperature control method for a flat-type showcase, comprising a plurality of temperature sensors and, when a plurality of temperature sensors are connected, calculating a temperature control based on a temperature difference between the plurality of temperature sensors. The temperature of the target chamber is corrected based on the corrected target chamber temperature value, and if there is a temperature sensor in a disconnected or short-circuit state, the other temperature is excluded except for the temperature sensor. A temperature control method for a flat-type showcase, wherein the temperature is controlled in accordance with a temperature detected by a sensor.
て、複数の温度センサーを備えるとともに、該複数の温
度センサーの検出温度に基づいて目標庫内温度値を補正
する演算手段を備えていることを特徴とする平型ショー
ケースの温度制御装置。6. A temperature control device for a flat-type showcase, comprising: a plurality of temperature sensors; and a calculating means for correcting a target in-compartment temperature value based on the detected temperatures of the plurality of temperature sensors. Characteristic temperature control device for flat showcases.
て、少なくとも１個の庫内温度センサーと輻射熱センサ
ーとを備えるとともに、庫内温度センサーの検出温度と
輻射熱センサーの検出温度とに基づいて目標庫内温度値
を補正する演算手段を備えていることを特徴とする平型
ショーケースの温度制御装置。7. A temperature control device for a flat-type showcase, comprising at least one internal temperature sensor and a radiant heat sensor, and a target container based on a temperature detected by the internal temperature sensor and a temperature detected by the radiant heat sensor. A temperature control device for a flat-type showcase, comprising a calculating means for correcting an internal temperature value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03133297A JP3226156B2 (en) | 1997-01-30 | 1997-01-30 | Temperature control method and apparatus for flat showcase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03133297A JP3226156B2 (en) | 1997-01-30 | 1997-01-30 | Temperature control method and apparatus for flat showcase |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10213372A true JPH10213372A (en) | 1998-08-11 |
| JP3226156B2 JP3226156B2 (en) | 2001-11-05 |
Family
ID=12328312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03133297A Expired - Lifetime JP3226156B2 (en) | 1997-01-30 | 1997-01-30 | Temperature control method and apparatus for flat showcase |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3226156B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008164201A (en) * | 2006-12-27 | 2008-07-17 | Daikin Ind Ltd | Refrigerating device |
| WO2012132131A1 (en) * | 2011-03-28 | 2012-10-04 | 三洋電機株式会社 | Control system for cooling devices |
-
1997
- 1997-01-30 JP JP03133297A patent/JP3226156B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008164201A (en) * | 2006-12-27 | 2008-07-17 | Daikin Ind Ltd | Refrigerating device |
| WO2012132131A1 (en) * | 2011-03-28 | 2012-10-04 | 三洋電機株式会社 | Control system for cooling devices |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3226156B2 (en) | 2001-11-05 |
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