JPH0112311Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes an outlet temperature sensing element which detects the outlet temperature of the evaporator and which is normally used to detect the control temperature in the refrigeration operation mode, and which detects the intake temperature of the evaporator. In addition, it officially relates to a freezing/refrigeration unit that has an internal temperature sensing element for detecting the control temperature in the refrigeration operation mode, and specifically, the outlet temperature sensing element or the internal temperature sensing element must be normal. is displayed in each operation mode, and when one regular temperature sensing element is abnormal, it is switched to the other temperature sensing element to indicate that temperature control is being performed.
The present invention relates to a temperature control status display device for a refrigeration unit.

Conventional freezing and refrigeration units (for example, "Refrigerated Container Handbook" by Seizando Co., Ltd., first edition published on January 18, 1972) do not display information such as when the refrigerator is operating, when defrosting is in progress, or when the internal temperature is appropriate. By providing an indicator light, the temperature control status can be visually recognized. By the way, if the unit simply indicates whether it is in the refrigerating operation mode or the freezing operation mode with an indicator light as in the above-mentioned conventional technology, for example, when in the refrigerating operation mode, the outlet temperature sensing element becomes abnormal and the temperature inside the refrigerator cannot be sensed. Even if temperature control is performed by switching to the element, it is not possible to display this fact and determine whether the temperature of the unit is currently being controlled normally or semi-normally. For this reason, refrigeration operation continues with the blowout temperature sensing element malfunctioning, which is always undesirable from the viewpoint of improving maintenance of the equipment. The freezing operation mode is also undesirable for the same reason as the refrigerating operation mode.

The present invention has been made in view of the above, and its purpose is to display at least six times the display of the operating mode and the display of whether the temperature sensing element is normal or not.
By forming four display bodies into a linear display body and arranging them graphically, the temperature control status can be determined at a glance, thereby improving maintainability. That's true.

The configuration of the present invention includes an outlet temperature sensing element that detects the outlet temperature of the evaporator and is normally used to detect the control temperature in the refrigeration operation mode, and an outlet temperature sensor that detects the intake temperature of the evaporator and is normally used to detect the control temperature in the refrigeration mode. It has an internal temperature sensing element that detects the control temperature in the operation mode, and if the outlet temperature sensing element becomes abnormal during the refrigeration operation mode, it switches to the internal temperature sensing element to control the temperature. A freezing/refrigeration unit that controls temperature by switching to an outlet temperature sensing element when the internal temperature sensing element becomes abnormal during operation mode has the following configuration.

That is, in the present invention, four display bodies consisting of a refrigeration operation mode display body, a freezing operation mode display body, an outlet temperature thermosensing element side display body, and a refrigerator temperature thermosensing element side display body are arranged at each vertex position of the rectangle. and,
Among the linear first, second, third, and fourth indicators, the first indicator indicates the refrigeration operation mode and the outlet temperature sensor side indicator, and the second indicator indicates the refrigeration operation mode. The third display unit displays the refrigeration operation mode display unit and the internal temperature sensor side display unit, and the fourth display unit displays the refrigeration operation mode display unit and the balloon unit. While arranged so as to connect the display body on the temperature sensing element side, the display unit selectively switches and displays the refrigeration operation mode display body and the freezing operation mode display body according to the refrigeration operation mode and the refrigeration operation mode. mode display switching means for outputting a display switching signal to display a display switching signal; and display switching means for switching and displaying the first to fourth display bodies according to the operating modes of the two operating modes and the respective operating states of the temperature sensing elements; The display switching means includes: a first determining means for determining whether the air outlet temperature sensing element is normal or abnormal based on the detection output of the air outlet temperature sensing element; a second determining means for determining whether the internal temperature sensing element is normal or abnormal; and a refrigeration operation mode display switching signal from the mode display switching means and a signal from the first determining means indicating whether the outlet temperature sensing element is normal. a first display body lighting means that outputs a lighting signal for the first display body in response to both signal inputs when the judgment signal is inputted together; and a refrigeration operation mode display switching signal from the mode display switching means. a third indicator lighting means for outputting a lighting signal for the third indicator in response to both signal inputs when a judgment signal indicating an abnormality of the blowout temperature thermosensor from the first judgment means is input together; , when both the refrigeration operation mode display switching signal from the mode display switching means and the judgment signal indicating the normality of the internal temperature sensing element from the second judgment means are input, a second judgment signal is activated in response to the input of both signals. a second display body lighting means for outputting a lighting signal for the second display body; a refrigeration operation mode display switching signal from the mode display switching means; and a determination signal indicating an abnormality of the internal temperature sensing element from the second determination means; a fourth indicator lighting means for outputting a lighting signal for a fourth indicator in response to both signal inputs when both signals are input; and a judgment signal from the first judgment means indicating an abnormality of the blowout temperature sensing element. and a judgment signal indicating an abnormality in the internal temperature sensing element are both inputted from the second judgment means, a double-sided display device that outputs a signal that lights up both the third and fourth display bodies in response to the input of both signals. and display lighting means.

According to the above configuration, the operation mode can be determined by looking at which of the refrigeration operation mode indicator and the refrigeration operation mode indicator is lit.

Further, in the refrigeration operation mode, when the outlet temperature sensing element is operating normally, the refrigeration operation mode indicator, the first indicator, and the outlet temperature sensor side indicator are lit simultaneously. In addition, if the temperature is being detected by the inside temperature sensing element because the outlet temperature sensing element is abnormal, the refrigeration operation mode display, the third display, and the inside temperature sensing element side display will be displayed at the same time. Light. Therefore, the temperature control state in the refrigeration operation mode can be easily determined by looking at the lighting state of each of these indicators.

On the other hand, in the refrigeration operation mode, when the internal temperature sensing element is operating normally, the refrigeration operation mode indicator, the second indicator, and the internal temperature sensing element side indicator light up simultaneously. In addition, if the temperature is being detected by the outlet temperature sensor because the internal temperature sensor is abnormal, the refrigeration operation mode display, the fourth display, and the outlet temperature sensor side display will light up simultaneously. do. Therefore, the temperature control state in the refrigeration operation mode can be easily determined by looking at the lighting state of each of these indicators.

Further, if both temperature sensing elements are abnormal, the third and fourth indicators are lit simultaneously, so that it can be easily determined that both elements are abnormal and temperature control is impossible.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

First, in this example, the marine container refrigeration system
The arrangement positions and operations of the outlet temperature sensing element SS and the interior temperature sensing element RS in the refrigeration unit will be explained, as well as their schematic configuration. As shown in Fig. 1, a blowout temperature sensing element SS and an interior temperature sensing element RS are installed in the duct 2 of a marine container 1.
will be installed. The outlet temperature sensor SS is a temperature sensor that detects the outlet temperature of the evaporator 3 and is normally used to detect the control temperature in the refrigeration operation mode. It is a temperature sensing element that detects the suction temperature and is normally used to detect the control temperature during the refrigeration operation mode. As shown in Fig. 2, a marine container freezing/refrigeration unit having both temperature sensing elements SS and RS has a compressor A, a condenser B, an expansion valve C, an evaporator D, a discharge pipe E, A high-pressure liquid pipe F, a low-pressure liquid pipe G, and a suction pipe H are connected in sequence to form a refrigerant circulation circuit, and a discharge pipe E and a low-pressure liquid pipe G are connected by a hot gas bypass pipe J. by
PID (proportional integral derivative)
Proportional plus Integral plus Derivative (abbreviation for Proportional plus Integral plus Derivative)) A proportional valve K whose opening degree is adjusted by operation is provided, and the proportional valve K controls the amount of hot gas bypass to control the temperature in the refrigeration operation mode. There is. In this embodiment, the proportional valve K is used to bypass the hot gas, but an electromagnetic on-off valve may be used instead of the proportional valve K, and the capacity of the compressor A can be controlled without the hot gas bypass. Alternatively, the temperature may be controlled by on/off control. By the way, the marine container freezing/refrigeration unit of this embodiment detects the outlet temperature with the outlet temperature sensing element SS during the refrigeration operation mode,
The detected blowout temperature is controlled to match the set temperature by controlling the hot gas bypass amount by the proportional valve K whose opening degree is adjusted by PID operation, but the blowout temperature sensing element SS becomes abnormal. If the inside temperature sensing element becomes hot, switch to the inside temperature sensing element RS and make corrections accordingly.
RS operates to switch to hot gas bypass amount control using the proportional valve K, opening/closing control of an electromagnetic on-off valve, or temperature control using on/off control of the compressor A. In addition, the marine container refrigeration/refrigeration unit of this embodiment detects the suction temperature with the interior temperature sensing element RS in the refrigeration operation mode, and controls the start/stop of the compressor A based on the detected suction temperature to perform the refrigeration operation. At the same time, when the internal temperature sensing element RS becomes abnormal, the outlet temperature sensing element SS
Temperature control is performed by switching to the current temperature and making corrections associated with the switching.

By the way, the above-mentioned unit of this embodiment not only displays whether the current operation mode is the refrigerating operation mode or the freezing operation mode, but also displays the temperature sensing element used to detect the control temperature in both modes. The temperature control state can be determined at a glance by displaying a distinguishing display as to whether it is an element or an internal temperature sensing element. FIG. 3 is an arrangement diagram of each display on the unit for the above determination. This unit has
First, the following four display bodies are positioned and placed at each vertex of a square. That is, on the diagram in FIG.
Refrigeration operation mode display L ₁ is placed at the top left corner [first display position DS 1 ], and the top right corner [second display position DS ₁ ] is placed at the top left corner [first display position DS 1 ].
The refrigeration operation mode indicator L ₃ is placed at the display position DS ₂ ], and the lower left apex [third display position DS ₃ ] indicates that the outlet temperature sensing element SS is normally operating to detect the control temperature. The outlet temperature thermosensing element side display L ₂ is arranged to display the temperature, and the lower right apex [4th display position DS ₄ ] indicates that the internal temperature thermosensor RS is normally operating to detect the control temperature. A temperature sensing element side display body _L4 for displaying the temperature inside the refrigerator is disposed. Note that these display bodies L ₁ , L ₂ , L ₃ , and L ₄ are constructed by having a display element such as a light emitting diode or liquid crystal facing a display window provided in the unit, and the form of the display window Depending on the situation, the display form can be changed to a triangular or square pattern in addition to the circular pattern shown. A linear display body is arranged between each of these display bodies as will be described later. That is, refrigeration operation mode indicator L ₁
A plurality of rectangular displays, for example, three rectangular displays, are arranged between the first display position DS ₁ where the display body L 2 is located and the third display position DS ₃ where the blowout temperature sensing element side display body L ₂ is located. The first display body _L5 is constructed by forming windows in a row at equal intervals and by exposing display elements such as light emitting diodes and liquid crystals to these rectangular display windows. Also, between the second display position DS ₂ where the refrigeration operation mode display L ₃ is arranged and the fourth display position DS ₄ where the refrigerator interior temperature sensing element side display L ₄ is arranged. A second display body L ₆ having the same configuration as the first display body L ₅ is also arranged. Further, between the first display position DS ₁ where the refrigeration operation mode display L ₁ is arranged and the fourth display position DS ₄ where the refrigerator interior temperature sensing element side display L ₄ is arranged. In this method, a plurality of rectangular display windows, for example four rectangular display windows, are formed in a row at equal intervals, and display elements such as light emitting diodes and liquid crystals are placed in front of these rectangular display windows.
A display body _L7 is constructed. Also, a second display position DS ₂ where the refrigeration operation mode display body L ₃ is arranged
and the third display position DS ₃ where the outlet temperature thermosensor side display L ₂ is arranged
A fourth display body _L8 having the same configuration as _L7 is arranged.

The display operation of each display body _L1 to _L8 arranged to display the temperature control state of the unit in this manner will be explained with reference to FIGS. 4 and 5.

FIG. 4 shows the display state of each of the display bodies _L1 to _L8 , and indicates that the display bodies corresponding to the shaded areas are in display operation, that is, are lit. Fifth
The figure is a block diagram showing a specific configuration for lighting each of the display bodies _L1 to _L8 .

In the same figure, the symbol FCC outputs a display switching signal that selectively switches and displays the refrigeration operation mode display _L1 and the refrigeration operation mode display _L3 according to the refrigerating operation mode and the freezing operation mode. A freezing/refrigerating operation mode display switching circuit as a mode display switching means, W indicates the first to fourth temperature sensing elements according to the above operating modes and the operating states of both temperature sensing elements SS and RS.
This is a display switching means that switches and displays displays L ₅ , L ₆ , L ₇ , and L ₈ .

This display switching means W is a temperature sensing element for blowing temperature.
Based on the detection output of SS, the temperature sensing element SS
a first determining device JC ₁ serving as a first determining means for determining whether the refrigerator is normal or abnormal; 2 Second judger JC ₂ as a judgment means
Further, the first to sixth AND circuits AND ₁
~ _AND6 , first to fourth OR circuits _OR1 to _OR4 , a NOR circuit NOR, and an inverter INV.

The above-mentioned first AND circuit AND ₁ determines the normality of the refrigeration operation mode display switching signal from the mode display switching means FCC and the blowout temperature thermosensing element SS from the first determining means JC ₁ in the scope of the utility model registration claim. When _a determination signal indicating . Further, the mode display switching means is operated by the fifth and sixth AND circuits AND ₅ and AND ₆ and the third OR circuit OR ₃ .
The refrigeration operation mode display switching signal from the FCC and the first
A third display body that outputs a lighting signal for the third display body _L7 in response to both signal inputs when a determination signal indicating an abnormality of the blowout temperature thermosensing element SS from the determination means _JC1 is input together. A lighting means is configured. Further, the fourth AND circuit AND ₄ determines that both the refrigeration operation mode display switching signal from the mode display switching means FCC and the judgment signal from the second judgment means JC ₂ indicating the normality of the internal temperature sensing element RS are detected. When input, the second display body lighting means outputs a lighting signal for the second display body _L6 in response to both signal inputs. Further, the mode display switching means is controlled by the second and third AND circuits AND ₂ , AND ₃ and the fourth OR circuit OR ₄ .
Refrigeration operation mode display switching signal from FCC and second
A fourth display outputs a lighting signal for the fourth display _L8 in response to both signal inputs when a judgment signal indicating an abnormality of the internal temperature sensing element RS from the judgment means _JC2 is inputted together. A body lighting means is configured. moreover,
The aforementioned NOR circuit NOR, the third and fourth OR circuits OR ₃ ,
By OR ₄ , the determination signal from the first determination means JC ₁ indicating an abnormality in the outlet temperature sensing element SS and the determination signal indicating an abnormality in the internal temperature sensing element RS from the second determination means JC ₂ are both output. Both display body lighting means is configured to output a signal for lighting both the third and fourth display bodies L ₇ and L ₈ in response to both signal inputs when the signal is input.

Hereinafter, the display mode of the display body will be divided into six types and explained.

(i) In the refrigeration operation mode, the outlet temperature sensing element
1st display mode when SS is normal: As shown in Fig. 4, refrigeration operation mode display
_L1 , the first display body _L5 , and the display body _L2 on the blowout temperature sensing element side are turned on. Each of these display bodies L ₁ ,
In order to light up L ₂ and L ₅ , the circuit of FIG. 5 operates as follows. That is, when a high level (logic "1") signal is output from the freezing/refrigeration mode display switching circuit FCC, the first light emitting diode LED ₁ , which is a display element constituting the refrigeration mode display L ₁ , lights up. This indicates that the operating mode of the unit is the refrigeration mode. Then, in this refrigeration operation mode, the outlet temperature sensing element SS, which is a regular control temperature detection temperature sensing element, is normal and operating in this refrigeration operation mode. A second light emitting diode serving as a display element constituting display body L ₂
In order to light up LED ₂ , the blowout temperature sensing element
The first normal operation signal is sent from SS to the first judger JC ₁
At the same time, the normality judgment signal (high level logic "1" signal) from the first judgment device JC ₁ , which judges that the blowout temperature sensing element SS is normal, is applied to the first two-input AND circuit AND. Input to one input terminal of ₁ . Then, the first two-input AND circuit AND ₁ outputs the logic "1" signal from the freezing/refrigeration mode display switching circuit FCC input to the other input terminal and the first determination input to one input terminal. In response to the logic "1" signal from the device JC ₁ , a logic "1" signal is output from the output terminal to light up the second light emitting diode LED ₂ .
However, in this case, the first two-input AND circuit
The logic “1” signal from the output terminal of AND ₁ is
The light is also output to the fifth light emitting diode LED ₅ , which is a display element constituting the first display body _L5 , so that the fifth light emitting diode LED ₅ is also turned on. Therefore, in this first display mode, the refrigeration operation mode display body _L1 and the first
display body L ₅ , and display body L ₂ on the outlet temperature sensing element side.
The lighting is controlled [the shaded area in Figure 4, 1], which means that the unit is currently in the refrigeration mode, and that the outlet temperature sensing element SS, which is used to detect the normal control temperature, is not operating normally. It will be displayed that there is.

(ii) In the refrigeration operation mode, the temperature sensing element
The second display mode when the SS is abnormal and the temperature is controlled by switching to the internal temperature sensing element RS:
In this second display mode, similarly to the first display mode in (i) above, the refrigeration operation mode display body L ₁
The first light emitting diode LED ₁ constituting the is lit. However, since the outlet temperature sensing element SS is abnormal, the first determiner JC ₁ outputs an abnormality determination signal (logic "0" signal) that determines that the outlet temperature sensing element SS is abnormal. Since it is input to the 2-input AND circuit AND ₁ of the first 2-input AND circuit AND ₁ , the output part of the first 2-input AND circuit AND 1
A logic "0" signal is applied to one input terminal of the input OR circuit _OR1 . In addition, logic "1" is input from the freezing/refrigeration operation mode display switching circuit FCC to the single inverting input terminal of the third two-input AND circuit _AND3 .
Since the signal is inputted, a signal of logic "0" is inputted from the output terminal of the third two-input AND circuit _AND3 to the other input terminal of the first two-input OR circuit _OR1 . Therefore, the first two-input OR circuit OR ₁
A logic “0” signal is input to the second light emitting diode LED ₂ from the output terminal of
The light emitting diode LED ₂ turns off. On the other hand, when the outlet temperature sensing element SS is abnormal, it is switched to the internal temperature sensing element RS, so when the internal temperature sensing element RS is normal, the second
The normal operation signal is input to the second judge JC ₂ , and as a result, the normal judgment signal (logic "1" signal) is input from the second judge JC ₂ to one input terminal of the 2-input NOR circuit NOR. be done. However,
The other input terminal of the two-input Norer circuit NOR receives an abnormality determination signal (logic "0") from the first determination device JC ₁ that determines that the blowout temperature sensing element SS is abnormal.
signal) is being input. Therefore, logic "0" is output from the output terminal of the two-input NOR circuit NOR.
is input to the third 2-input OR circuit OR ₃ , while the fifth 2-input AND circuit AND ₅
One inverting input terminal of the circuit receives a logic "0" signal from the first judge JC ₁ , while the other input terminal of the two-input AND circuit AND ₅ receives a logic "0" signal from the second judge JC _2. Since a signal of "1" is input, a signal of logic "1" is input from the output terminal of the fifth two-input AND circuit _AND5 to one input terminal of the sixth two-input AND circuit _AND6 . In addition, the other input terminals of the 6th 2-input AND circuit AND ₆ include a freezing/refrigeration operation mode display switching circuit FCC.
A logic “1” signal (signal corresponding to the refrigeration operation mode) is input from the refrigeration mode. Therefore,
A logic “1” signal is applied to the seventh light emitting diode LED7 through the third two-input OR circuit _OR3 , which causes the seventh light emitting diode to
The LED 7 lights up and the third display body L7 performs a display operation, while the sixth two-input AND circuit AND ₆
Logic "1" is output from the output terminal of the output terminal to the fourth light emitting diode LED _{4 ,} which is a display element constituting the internal temperature sensing element side display L ₄ , through the second OR circuit OR 2.
This signal causes the fourth light emitting diode LED ₄ to light up, and the internal temperature sensing element side display L ₄ performs a predetermined display operation. Therefore,
In this second display mode (ii), as shown in the shaded area in Fig. 4, the refrigeration operation mode display
_L1 , the third display _L7 , and the internal temperature sensing element side display _L4 are controlled to light up, and as a result,
The unit is currently in refrigeration mode and the outlet temperature sensing element for normal control temperature detection.
It is displayed that the temperature is controlled by switching to the internal temperature sensing element RS because the SS is abnormal.

(iii) In the refrigeration operation mode, both temperature sensing elements SS,
Third display mode when both RSs are abnormal: In this third display mode, the display indicating that the refrigeration operation mode is in effect is displayed in the same way as the first and second display modes in (i) and (ii) above. The first light emitting diode LED ₁ constituting the display body L ₁ to be displayed is lit.
However, since both temperature sensing elements SS and RS are abnormal, the first and second determining devices JC ₁ and JC ₂ output an abnormality determination signal, that is, a signal of logic "0". Therefore, a logic "0" signal is output from each output terminal of the first to sixth two-input AND circuits AND ₁ to AND ₆ , and thereby the second and fourth light emitting diodes LED ₂ ,LED ₄
goes out. On the other hand, each input terminal of the two-input NOR circuit NOR has a first and a second determiner JC ₁ ,
Since the logic “0” signal is input from JC ₂ ,
From the output terminal of the 2-input NOR circuit NOR, the second
A logic "1" signal is input to the seventh and eighth light emitting diodes LED ₇ and LED ₈ via the fourth OR circuits OR ₃ and OR ₄ , respectively, and thereby the seventh and eighth light emitting diodes LED ₇ , LED ₈ lights up.

In this way, the first, seventh, and eighth light emitting diodes LED ₁ , LED ₇ , and LED ₈ light up as shown in the shaded area in FIG. 4, and as a result, in this third display mode (iii) The unit is currently in the refrigeration mode as indicated by the refrigeration mode indicator L ₁ and the third and fourth indicators L ₇ and L ₈ , but both temperature sensing elements SS and RS have malfunctioned and the temperature is low. It appears to be out of control. Furthermore, since the third and fourth display bodies L ₇ and L ₈ are arranged so as to cross each other, the temperature control failure state is displayed as an "X" mark, and at first glance it appears that the unit is ( It can be determined that the display mode is in the third display mode of iii).

(iv) In the refrigerator operation mode, the temperature sensing element inside the refrigerator
Fourth display mode when RS is normal: In this fourth display mode, a logic "0" signal is output from the freezing/refrigeration operation mode display switching circuit FCC, which causes the first light emitting diode to
LED ₁ turns off. However, the logic "0" signal from the display switching circuit FCC, that is, the signal indicating that the refrigeration operation mode is in effect, is input to the inverter circuit INV, and as a result, the logic "1" signal is output from the output terminal of the inverter circuit INV. is output, and as a result, it is connected to the output terminal of the inverter circuit INV, and the refrigeration operation mode indicator
The third light emitting diode LED ₃ constituting L ₃ lights up.

In addition, the logic "0" signal from the freezing/refrigeration mode display switching circuit FCC input to each input terminal of the fourth two-input AND circuit AND ₄ and the internal temperature from the second judgment device JC ₂ are also input. Due to the normality judgment signal indicating that the temperature sensing element RS is normal, that is, the logic "1" signal, a logic "1" signal is output from the output terminal of the fourth 2-input AND circuit _AND4 , and the logic "1" signal is output from the output terminal of the fourth two-input AND circuit AND4. The light is input to the sixth light emitting diode LED ₆ that constitutes the display body L ₆ . As a result, the 6th
Light emitting diode LED ₆ lights up. Further, the signal of logic "1" from the output terminal of the fourth two-input AND circuit _AND4 is transmitted to the fourth circuit constituting the internal temperature sensing element side display _L4 via the second OR circuit _OR2 . Light up the light emitting diode LED ₄ . In this way, in the fourth display mode (iv), the third, fourth, and sixth light emitting diodes LED ₃ , LED ₄ ,
LED ₆ is lit and therefore the unit is currently
It is displayed that the refrigerator is in the refrigerating operation mode and that the regular internal temperature sensing element RS is operating normally to control the temperature.

(v) In the refrigerator operation mode, the temperature sensing element inside the refrigerator
Fifth display mode when the temperature is controlled by switching to the blowout temperature sensing element SS due to an abnormality in the RS: In this fifth display mode, the fourth display mode in (iv) above is used.
The refrigeration operation mode display body is the same as the display mode of
L ₃ is display controlled. In addition, in this fifth display mode, since the internal temperature sensing element RS is abnormal, the abnormality determination signal, which is a logic "0" signal, is sent from the second determination device JC ₂ to the second, fourth, and third display modes.
Fifth two-input AND circuit AND ₂ , AND ₄ ,
AND ₅ and the two-input NOR circuit NOR, while the normality judgment signal of logic "1" indicating that the blowout temperature sensing element SS is normal is input from the first judgment device JC ₁ to the first and second judgment circuits. 2. It is input to the fifth two-input AND circuits AND ₁ , AND ₂ , AND ₅ and the two-input NOR circuit NOR. Therefore, the logic "1" signal from the output terminal of the third AND circuit AND ₁ is input to the second light emitting diode LED 2 via the first OR circuit OR ₁ , and the second light emitting diode LED ₂ is activated. While diode LED ₂ lights up,
The logic "1" signal from the output terminal of the third AND circuit _AND3 passes through the fourth OR circuit _OR4 ,
The light is input to the eighth light emitting diode LED ₈ constituting the fourth display body _L8 , and this eighth light emitting diode LED ₈ lights up.

Therefore, in the fifth display mode (v), the second, third, and eighth light emitting diodes LED ₂ , LED ₃ ,
LED ₈ lights up, indicating that the unit is currently in the refrigeration mode, and since the internal temperature sensing element RS, which is normally used to detect temperature control, is abnormal, it is switched to the outlet temperature sensing element SS, and temperature control is started. is displayed.

(vi) In refrigeration operation mode, both temperature sensing elements SS,
6th display mode when both RS are abnormal: In this 6th display mode, the refrigeration operation mode indicator L ₃ display operation is similar to the 4th and 5th display modes in (iv) and (v) above. are doing. Also, this sixth
In the display mode, the first and second determiners JC ₁ ,
An abnormality judgment signal of logic "0" is sent from JC ₂ to the first, second, fourth, and fifth two-input AND circuits AND ₁ ,
AND ₂ , AND ₄ , AND ₅ and 2-input NOR circuit
Since the light is input to NOR, the seventh and eighth light emitting diodes LED ₇ and LED ₈ light up. Therefore, in the sixth display mode (vi), the third, seventh, and eighth light emitting diodes LED ₃ ,
Refrigeration operation mode display corresponding to LED ₇ and LED ₈
L ₃ , third and fourth indicators L ₇ and L ₈ perform display operations, indicating that the unit is currently in the refrigeration mode, and both temperature sensing elements SS and RS are abnormal, making temperature control impossible. The status is displayed as shown in the shaded area in FIG. 4. In this way, in this embodiment, the temperature control status of the unit can be displayed in each of the display modes (i) to (vi) by the first means FCC and the second means W. can.

FIG. 6 is a block circuit diagram of another embodiment of the present invention, in which parts corresponding to those in FIG. 5 are given the same reference numerals. The embodiment of FIG. 6 is particularly different from the previously described embodiments in that the second means W includes a central processing unit CPU, a random access memory RAM read-only memory ROM, and an I/O interface.
It consists of a microcomputer MC including an IF and an A/D converter ADC. Note that FIG. 7 is a flowchart for explaining the operating procedure by the microcomputer. The configuration and operation of the embodiment shown in FIG. 6 will be explained based on this flowchart. First, the unit on-off switch is turned on at start step no. Next, in a first judgment step _n1 , it is determined whether the operation mode changeover switch SW has been switched to the refrigeration operation mode position chill. That is, if the operation mode changeover switch SW is switched to the refrigeration operation mode position chill, the central processing unit of the microcomputer MC is transferred via the I/O interface IF.
A corresponding switching position signal is input to the CPU. Central processing unit of microcomputer MC
When the CPU determines that the operation mode changeover switch SW has been switched to the refrigeration operation mode position chill (YES), the process proceeds to the next second determination step _n2 . In addition, the read-only memory ROM of the microcomputer MC stores the detected temperature of the air outlet temperature sensing element SS.
A first determination program that determines that there is an abnormality if Ts is not in the range of low abnormal control temperature T _L < detected temperature Ts < high abnormal control temperature T _H ; and a refrigerator temperature sensing element RS.
Detected temperature T _R is low abnormal control temperature T _L < detected temperature
A second determination program is stored that determines that there is an abnormality if it does not fall within the range of T _R <high abnormal control temperature T _H .

On the other hand, when it is determined that the operation mode changeover switch SW is in the refrigeration operation mode position chill, the electric signal related to the detected temperature Ts of the outlet temperature sensing element SS is converted into a digital value via the A/D converter ADC. After that, it is input to the central processing unit CPU of the microcomputer MC via the I/O interface IF. This central processing unit CPU reads the first determination program from the read-only memory ROM, and determines that low abnormality control temperature T _L <detected temperature Ts < high abnormality control temperature T _H based on the detected temperature Ts.
A judgment is made as to whether it is (affirmative) or not (negative) in a second judgment step _n2 . Second judgment step
If an affirmative YES judgment is made in n ₂ , the first
Proceeding to step _n3 , in this first step _n3, the first, second and fifth light emitting diodes _LED1 ,
A command signal for lighting LED ₂ and LED ₅ is output from the central processing unit CPU of the microcomputer MC to each of the light emitting diodes LED ₁ , LED ₂ , and LED ₅ via the I/O interface IF. This is the first display mode (i), ie, a mode that indicates that the regular blowout temperature sensing element SS is operating normally during the refrigeration operation mode. In addition, in the third judgment step _n4 following the first step _n3 , the low abnormality control temperature T _L <detected temperature Ts < high abnormality control temperature T _H is determined again by the blowout temperature thermosensor SS.
A judgment is made as to whether the detected temperature Ts is satisfied (affirmative) or not (negative), and when the judgment is positive, the third judgment step _n4 is repeated, and when the judgment is negative, the second judgment step n4 is repeated. In step n ₅ , the fourth and seventh
While lighting up the light emitting diodes LED ₄ and LED ₇ ,
A command signal for turning off the second and fifth light emitting diodes LED ₂ and LED ₅ is sent from the central processing unit CPU to each light emitting diode LED ₂ , LED ₄ , LED ₅ , and LED ₇ via the I/O interface IF. Sent out. This is because in the second display mode (ii) above, during the refrigeration operation mode, the outlet temperature sensing element SS is abnormal, so it is switched to the normal interior temperature sensing element RS, and the temperature is controlled. correspond to what is being done.

Next, when a negative NO judgment is made in the second judgment step _n2 , this judgment
Since SS is abnormal, the signal corresponding to the detected temperature T _R of the internal temperature sensing element RS is A/
Central processing unit of microcomputer MC via D converter ADC, I/O interface IF
Input to CPU. On the other hand, the central processing unit CPU is
The second judgment program is read from the read-only memory ROM, and in the fourth judgment step _n6, the detected temperature T _R of the chamber temperature sensor RS is related to the second judgment program, and the low abnormality control temperature T _L <the detected temperature T _R
<Determine whether the high abnormal control temperature T _H is satisfied (affirmative) or not (negative). If it is determined as YES in the fourth judgment step _n6 , the third step
Proceed to n ₇ . The third step _n7 is the first, fourth and seventh step.
The microcomputer MC sends command signals to light up the light emitting diodes LED ₁ , LED ₄ , and LED ₇ .
Send from. As a result, the second display mode (ii) (FIG. 4, 2) can be obtained. On the other hand, if a negative determination is made in the fourth determination step _n6 , the process proceeds to the fourth step _n8 . 4th step n ₈
are the first, seventh, and eighth light emitting diodes LED ₁ ,
A command signal for lighting LED ₇ and LED ₈ is sent from the microcomputer MC. the result,
The third display mode (iii) described above (FIG. 4, 3) can be obtained.

In the fifth judgment step _n9 following the third step _n7 or the second step _n5 , the internal temperature sensor
Does the detected temperature T _R of RS satisfy low abnormal control temperature T _L < detected temperature T _R < high abnormal control temperature T _H (affirmative)?
A determination is made whether or not (no), and if an affirmative YES determination is made, this fifth determination step _n9 is repeated, and if a negative determination is made, the process proceeds to the next fifth step _n10 . In the fifth step _n10 , a command signal for turning on the eighth light emitting diode LED ₈ and turning off the fourth light emitting diode LED ₄ is sent from the microcomputer MC. Therefore, in this fifth step _n10 , the third display mode (iii) described above (FIG. 4, 3) can be obtained.

Next, in the first judgment step _n1 , when it is judged NO that the operation mode changeover switch SW is not in the refrigeration operation mode position chill, that is, it is judged that it has been switched to the refrigeration operation mode position frozen, the sixth judgment is made. Proceed to step n ₁₁ . In the sixth judgment step _n11 , the detected temperature T _R of the internal temperature sensing element RS is determined as follows: Low abnormal control temperature T _L < Detected temperature T _R < High abnormal control temperature T _H
It is possible to judge whether the following is satisfied (affirmative) or not (negative). This judgment is based on read-only memory ROM
This is performed based on the second determination program stored in the. Yes at 6th judgment step n ₁₁
If a YES determination is made, the process proceeds to the sixth step _n12 . In the sixth step _n12 , a command signal for lighting the third, fourth, and sixth light emitting diodes _LED3 , _LED4 , and _LED6 is sent from the microcomputer MC. As a result, in the sixth step _n12 ,
It is possible to obtain the fourth display mode (iv) (FIG. 4), that is, the refrigerating operation mode in which the temperature is controlled by the internal temperature sensing element RS. 7th judgment step after 6th step n ₁₂
In n ₁₃ , the detected temperature T _R of the internal temperature sensing element RS is
The judgment of whether low abnormal control temperature T _L < detected temperature T _R < high abnormal control temperature T _R is satisfied (affirmative) or not (negative) is made again, and if the judgment is affirmative,
The seventh judgment step _n13 is repeated, and if the judgment is negative, the process proceeds to the next seventh step _n14 . In the seventh step _n14 , the second and eighth light emitting diodes _LED2 ,
A command signal for turning on the LED ₈ and turning off the fourth and sixth light emitting diodes LED ₄ and LED ₆ is sent from the microcomputer MC. As a result, the fifth display mode (v) described above (FIG. 4, 5) can be obtained. On the other hand, if a negative determination is made in the sixth determination step _n11 , the process advances to an eighth determination step _n15 . In the eighth judgment step _n15 , it is judged in the sixth judgment step _n11 that the internal temperature sensing element RS is abnormal, and therefore the outlet temperature sensing element RS is determined to be abnormal.
When switching to SS, an electric signal corresponding to the detected temperature Ts of the blowout temperature sensing element SS is sent to the A/D converter.
The signal is input to the central processing unit CPU of the microcomputer MC via the ADC and I/O interface IF. Based on the input electrical signal, it is determined whether the blowout temperature sensing element SS is normal or not. Therefore,
In the eighth judgment step n ₁₅ , the low abnormal control temperature
The central processing unit CPU determines whether the detected temperature Ts of the outlet temperature sensing element SS satisfies T _L <detected temperature Ts < high abnormal control temperature T _H (affirmative) or not (negative). The central processing unit CPU reads the first determination program stored in the read-only memory ROM, and makes the determination in the eighth determination step _n15 based on the read value. In the eighth judgment step _n15 , if a negative judgment is made, the eighth step
Proceed to n ₁₈ . In the eighth step n ₁₈ , the third
Seventh and eighth light emitting diodes LED ₃ , LED ₇ ,
A command signal for lighting LED ₈ is sent from microcomputer MC. As a result, (vi)
In the sixth display mode (FIG. 4, 6), that is, in the refrigeration operation mode, a display is made that the temperature cannot be controlled because both temperature sensing elements SS and RS are abnormal. On the other hand, in the eighth judgment step n ₁₅ , it is affirmative.
If YES is determined, the process proceeds to the ninth step _n17 .
In the ninth step _n17 , a command signal for lighting the second, third, and eighth light emitting diodes _LED2 , _LED3 , and _LED8 is sent from the microcomputer MC. As a result, the fifth display mode (v) described above (FIG. 4, 5) can be obtained. In addition, in the ninth judgment step _n18 following the seventh and ninth steps _n14 and _n17 , the detected temperature of the blowout temperature sensing element SS
A determination is made again as to whether Ts satisfies low abnormal control temperature T _L < detected temperature Ts < high abnormal control temperature T _H (affirmative) or not (negative), and if the determination is YES, the ninth determination is made. Step _n18 is repeated, and if the determination is negative, the process proceeds to the tenth step _n19 . In the tenth step _n19 , a command signal for turning on the seventh light emitting diode LED ₇ and turning off the second light emitting diode LED ₂ is sent to the microcomputer MC.
The light is transmitted from the light emitting diode to the corresponding light emitting diode. As a result, the sixth display mode (vi) described above (FIG. 4, 6) can be obtained.

In this manner, each of the display modes (i) to (vi) can be obtained in the embodiment shown in FIG. 6 in the same manner as in the embodiment shown in FIG.

In the above embodiment, each of the first to fourth display bodies _L5 to _L8 is composed of one light emitting diode, but each display body is composed of a plurality of light emitting diodes, and each display body is composed of a plurality of light emitting diodes. The lighting of a plurality of light emitting diodes may be controlled simultaneously for each display body.

In addition, in the above embodiment, although the first to fourth display bodies have a plurality of display windows, they are made into one elongated display window, and one or more light emitting diodes are installed in this elongated display window. It may also be possible to have it appear. In this case, when a plurality of light emitting diodes are arranged to face one elongated display window, it is preferable to control the lighting of these plurality of light emitting diodes simultaneously.

In the above embodiments, the display windows constituting each display body can be variously modified, such as circular or triangular.

As explained above, according to the present invention, since it has the above configuration, it is possible to display whether the mode is refrigerated operation mode or frozen operation mode, and also display the temperature sensing element used in each operation mode. Therefore, it is possible to confirm that the genuine thermosensing element is normal and temperature control is being performed normally, or that the genuine thermosensing element is malfunctioning and that the other normal thermosensing element is functioning properly. Effects such as being able to determine at a glance whether temperature control is being performed normally or whether temperature control is impossible because both temperature sensing elements are abnormal are exhibited.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing the arrangement positions of the outlet temperature sensing element and the interior temperature sensing element in the freezing/refrigeration unit of the present invention, FIG. 2 is a refrigerant circulation circuit diagram in the unit, and FIG. The figure is a diagram showing the arrangement of each display body in an embodiment of the present invention, FIG. 4 is a diagram showing the display bodies whose lighting is controlled according to each display mode, and FIG. 5 is a diagram showing the lighting of the display bodies. FIG. 6 is a block circuit diagram for control, and FIG. 6 is a block circuit diagram of another embodiment of the present invention, and FIG. 7 is a flowchart for explaining its operation. 3...Evaporator, SS...Blowout temperature sensing element, RS
...Interior temperature sensing element, L ₁ ... Refrigerating operation mode indicator, L ₃ ... Refrigerating operation mode indicator, L ₅ to _{L 8}
...First to fourth display bodies, FCC... Freezer/refrigeration operation mode display switching circuit (first means), W...
Second means, LED ₁ to LED ₈ ... light emitting diodes,
MC...Microcomputer, IF...I/O interface.

Claims (1)

[Claims for Utility Model Registration] An outlet temperature sensing element SS which detects the outlet temperature Ts of the evaporator 3 and which is normally used to detect the control temperature in the refrigeration operation mode, and a suction temperature T _R of the evaporator 3. A temperature-sensing element that detects temperature inside the refrigerator and is normally used to detect control temperature during freezing operation mode.
RS, and when the outlet temperature sensing element SS becomes abnormal in the refrigeration operation mode, it switches to the interior temperature sensing element RS to control the temperature, while in the freezing operation mode, the interior temperature sensing element RS becomes abnormal. This is applied to freezing and refrigeration units that control _the temperature by switching to _the outlet temperature sensing element SS when the temperature changes. Four display bodies consisting of an element side display body L ₂ and a refrigerator temperature sensing element side display body L ₄ are arranged at each vertex position of the rectangle, and linear first, second, third, and fourth display bodies are arranged at each vertex position of the rectangle. Display body L ₅ , L ₆ , L ₇ , L ₈
Among them, the first display _L5 is the refrigeration operation mode display
L ₁ and outlet temperature thermosensing element side display L ₂ , second display L ₆ , refrigeration operation mode display L ₃ and refrigerator temperature thermosensing element side display L ₄ , third display L ₇ is the refrigeration operation mode display L ₁ and the internal temperature sensing element side display
L ₄ and the fourth display L ₈ is the refrigeration operation mode display.
L ₃ and the display body L ₂ on the side of the blowout temperature sensing element are respectively arranged, and the refrigeration operation mode display body L ₁ and the refrigeration operation mode display are arranged depending on the refrigeration operation mode and the freezing operation mode. a mode display switching means FCC that outputs a display switching signal for selectively switching and displaying between the two operating modes and the temperature sensing elements SS _and RS;
The first to fourth display bodies L ₅ ,
and a display switching means W for switching and displaying L ₆ , L ₇ , and L ₈ , and the display switching means W selects the display of the discharge temperature thermosensing element SS based on the detection output of the discharge temperature thermosensing element SS. A first determining means JC ₁ that determines whether the temperature sensing element RS is normal or abnormal, and a second determining means JC ₂ that determines whether the temperature sensing element RS is normal or abnormal based on the detection output of the temperature sensing element RS. , when both the refrigeration operation mode display switching signal from the mode display switching means FCC and the judgment signal indicating the normality of the blowout temperature sensing element SS from the first judgment means JC ₁ are input, it responds to the input of both signals. first
a first display body lighting means AND ₁ which outputs a lighting signal for the display body L ₅ ; a refrigeration operation mode display switching signal from the mode display switching means FCC and a blowout temperature sensing element SS from the first determination means JC ₁ ; When a judgment signal indicating an abnormality is input together, the third signal is activated in response to both signal inputs.
A third indicator lighting means AND ₅ , AND ₆ , OR ₃ outputs a lighting signal for the indicator L ₇ , and a refrigeration operation mode display switching signal from the mode display switching means FCC and a refrigerator from the second judgment means JC _2. When the judgment signal indicating the normality of the internal temperature sensing element RS is input together, the second
a second indicator lighting means AND ₄ which outputs a lighting signal for the indicator L ₆ ; a refrigeration operation mode display switching signal from the mode display switching means FCC; and an internal temperature sensing element RS from the second determining means JC ₂ . When a judgment signal indicating an abnormality is input together, the fourth
Fourth display lighting means AND ₂ , AND ₃ , OR ₄ outputting a lighting signal for the display L ₈ , and a temperature sensor SS blowing out from the first determination means JC ₁
When a judgment signal indicating an abnormality in the chamber temperature sensing element RS and a judgment signal indicating an abnormality in the internal temperature sensing element RS are both inputted from the second judgment means JC ₂ , the third and fourth display bodies are activated in response to both signal inputs. A temperature control status display device for a freezing/refrigeration unit, comprising: double display lighting means NOR, OR ₃ , OR ₄ that outputs a signal to light both L ₇ and L ₈ .