CN211834286U - Temperature control and temperature display device for commercial dish washing machine - Google Patents
Temperature control and temperature display device for commercial dish washing machine Download PDFInfo
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- CN211834286U CN211834286U CN201922371651.2U CN201922371651U CN211834286U CN 211834286 U CN211834286 U CN 211834286U CN 201922371651 U CN201922371651 U CN 201922371651U CN 211834286 U CN211834286 U CN 211834286U
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Abstract
The utility model relates to a temperature control and temperature display device for commercial dish washer belongs to kitchen equipment technical field. In the device, a first thermistor is used for collecting the temperature of the heating box, and a second thermistor is used for collecting the temperature of the main washing box. The preposed signal conditioning unit is used for prepositioning the acquired temperature signal, the main controller is used for carrying out digital-to-analog conversion on the analog voltage signal, comparing the analog voltage signal with the temperature control setting of the liquid crystal touch display screen, and controlling the output driving unit to output according to the comparison result. The output driving unit is used for realizing the output of the first switching value and the second switching value. The device can reduce two temperature controllers and two thermistors required by the original temperature control and display functions into two thermistors, and can reduce the cost of the commercial dish washing machine. The temperature control and temperature display sensitive elements in the device are consistent, so that the difference between the temperature control and temperature display of the commercial dish washer can be effectively improved, and the working reliability of the commercial dish washer is improved.
Description
Technical Field
The utility model relates to a temperature control and temperature display device for commercial dish washer belongs to kitchen equipment technical field.
Background
The commercial dishwasher is a restaurant special device capable of quickly and automatically washing tableware such as bowls, dishes, cups, plates, chopsticks, knives, forks and the like, and the washing process comprises two steps: main washing and spraying. The main washing is to inject hot water dissolved with a certain concentration ratio of detergent into the dishes to be washed at a high speed and to wash them for a period of time. The spraying is to spray hot water with drier dissolved in certain concentration proportion to tableware at high speed for some time. After the main washing and the spraying are finished, the residual water on the surface of the tableware is naturally evaporated under the action of the drier and the self waste heat.
The main washing process needs to use hot water with the temperature of more than 55 ℃, so that the effect of the detergent can be fully exerted, and meanwhile, the temperature of the tableware can be increased, and the spraying effect is improved. The spraying process needs to use hot water with the temperature of more than 85 ℃, and the water temperature is utilized, so that the drying effect on the surface of the tableware can be ensured, and a certain tableware disinfection effect is achieved. The traditional commercial dishwasher independently utilizes a mechanical temperature control switch to control the water temperature of the main washing tank and the warming tank by controlling the starting and stopping of the heater. Because the temperature change process information can not be obtained from the temperature control switch, the commercial dishwasher needs to additionally adopt two thermistors to respectively collect the temperatures of the main washing box and the warming box and send the temperatures to an external display device for displaying. This approach, while somewhat reducing the complexity of the temperature control system design, results in increased costs and also presents the problem of inconsistent control and display temperatures, typical of products such as cover-lift commercial dishwashers of the type ilard WT 80.
Disclosure of Invention
The utility model aims at providing a temperature control and temperature display device for commercial dishwasher improves the structure of existing similar device, considers commercial dishwasher functional requirement comprehensively, through reducing redundant sensing element reduce cost, improves the uniformity of temperature control and demonstration simultaneously.
The utility model provides a temperature control and temperature display device for commercial dishwasher, include: the liquid crystal touch control display screen comprises a first thermistor, a second thermistor, a preposed signal conditioning unit, a main controller, an output driving unit, a first switching value, a second switching value and a liquid crystal touch control display screen, wherein:
the first thermistor is used for collecting the temperature of a heating box of the commercial dishwasher;
the second thermistor is used for collecting the temperature of a main washing box of the commercial dishwasher;
the preposed signal conditioning unit is used for preposing and conditioning the temperature of the heating box acquired by the first thermistor and the temperature of the main washing box acquired by the second thermistor to respectively obtain analog voltage signals corresponding to the temperature of the heating box and the temperature of the main washing box, and the first thermistor and the second thermistor are respectively connected with the preposed signal conditioning unit through signal wires;
the main controller is used for receiving the analog voltage signal in the preposed signal conditioning unit, performing digital-to-analog conversion on the received analog voltage signal corresponding to the temperature of the heating box and the temperature of the main washing box to obtain a quantized digital signal corresponding to the temperature of the heating box and the temperature of the main washing box, comparing the quantized digital signal with a temperature control setting signal of the liquid crystal touch display screen, and obtaining control signals of a first switching value and a second switching value according to a comparison result;
the output driving unit is used for receiving control signals of a first switching value and a second switching value of the main controller and sending the control signals to the first switch and the second switch;
a first switch for controlling a heater in the heating box according to the received control signal;
a second switch for controlling the heater of the main washing tank according to the received control signal;
and the liquid crystal touch display screen is used for inputting the set control temperature and displaying the temperature of the commercial dishwasher in real time.
The preposed signal conditioning unit in the device comprises a precise reference voltage source composed of a voltage source chip U2, a precision resistor R1, a precision resistor R2 and an operational amplifier U1, and provides drive for an NTC thermistor RT1 and an RT2, and a thermistor voltage signal is isolated, driven and output through U3.
The output driving unit in the device adopts optical couplers OPT1 and OPT2 to isolate the control signal and the output driving signal.
The first switching value in the device is a passive normally open contact of the output relay J1, and the second switching value is a passive normally open contact of the output relay J2.
The utility model provides a temperature control and temperature display device for commercial dish washer, its advantage:
1. the utility model discloses a temperature control and temperature display device for commercial dish washer reduces original temperature control and two required temperature controller of display function and two thermistors into two thermistors, therefore has reduced commercial dish washer's cost.
2. The temperature control in the device is consistent with the sensitive element of the temperature display, so that the difference between the temperature control and the temperature display of the commercial dish washer can be effectively improved, the working reliability of the commercial dish washer is improved, and the service cost is saved.
Drawings
Fig. 1 is a schematic circuit diagram of a temperature control and display device for a commercial dishwasher according to the present invention.
Fig. 2 is a circuit diagram of a preposed signal conditioning unit in the temperature control and display device shown in fig. 1.
Fig. 3 is a circuit diagram of an output driving unit in the temperature control and display device shown in fig. 1.
Detailed Description
The utility model provides a temperature control and temperature display device for commercial dish washer, its schematic circuit diagram is shown as figure 1, and its characterized in that the device includes: the liquid crystal touch control display screen comprises a first thermistor, a second thermistor, a preposed signal conditioning unit, a main controller, an output driving unit, a first switching value, a second switching value and a liquid crystal touch control display screen, wherein:
the first thermistor is used for collecting the temperature of a heating box of the commercial dishwasher;
the second thermistor is used for collecting the temperature of a main washing box of the commercial dishwasher;
a preposed signal conditioning unit, the circuit of which is shown in fig. 2, for prepositioning the heating box temperature collected by the first thermistor and the main washing box temperature collected by the second thermistor to respectively obtain analog voltage signals corresponding to the heating box temperature and the main washing box temperature, the analog voltage signals respectively correspond to the ADB1 and the ADB2 in fig. 2, and the first thermistor and the second thermistor are respectively connected with the preposed signal conditioning unit through signal lines;
the main controller is used for receiving the analog voltage signal in the preposed signal conditioning unit, performing digital-to-analog conversion on the received analog voltage signal corresponding to the temperature of the heating box and the temperature of the main washing box to obtain a quantized digital signal corresponding to the temperature of the heating box and the temperature of the main washing box, comparing the quantized digital signal with a temperature control setting signal of the liquid crystal touch display screen, and obtaining control signals of a first switching value and a second switching value according to a comparison result;
an output driving unit, the circuit of which is shown in fig. 3, for receiving the control signals of the first switching value and the second switching value of the main controller and sending the control signals to the first switch and the second switch;
a first switch, i.e., a relay J1 in fig. 3, for controlling the heater in the heating box in accordance with the received control signal in such an amount as to output the passive contacts K011 and K012 of the relay J1 of the driving unit;
a second switch, i.e., a relay J2 in fig. 3, for controlling the heater of the main washing tank according to the received control signal, the control amount of which is the passive contacts K021 and K022 of the output drive unit relay J2;
and the liquid crystal touch display screen is used for inputting the set control temperature and displaying the temperature of the commercial dishwasher in real time.
The circuit of the preposed signal conditioning unit in the device is shown in fig. 2, a voltage source chip U2, a precision resistor R1, a precision resistor R2 and an operational amplifier U1 form a precision reference voltage source to provide driving for NTC thermistors RT1 and RT2, and voltage signals of the thermistors are isolated and driven to be output through U3.
The circuit of the output driving unit in the device is shown in fig. 3, and the optical couplers OPT1 and OPT2 are used for isolating the control signal and the output driving signal.
The first switching value in the device is a passive normally open contact of the output relay J1, and the second switching value is a passive normally open contact of the output relay J2.
The utility model is introduced below the utility model is used for the temperature control of commercial dish washer and the theory of operation that shows:
(1) the first thermistor is arranged in the heating box, and the second thermistor is arranged in the main washing box;
(2) temperature T is controlled by arranging heating box through liquid crystal display touch screenBAnd the temperature T of the main washing tank is controlledW；
(3) The first thermistor RT1 outputs a voltage signal under the drive of a reference voltage VREF1, the voltage signal is output and driven through U3A to obtain a voltage signal ADB1, the voltage signal is sent to the main controller for digital-to-analog conversion, and a quantized value T of the temperature of the heating box is obtainedBC；
(4) The second thermistor RT2 outputs a voltage signal driven by a reference voltage VREF2 and then outputs and drives the voltage signal through U3B to obtain a voltage signal ADB2, and the voltage signal is sent to the main controller for digital-to-analog conversion to obtain a quantized value T of the temperature of the main washing boxWC；
(5) When T isBC>TBWhen the output of the output driving unit X01 is high level, normally open contacts K011 and K012 of the first switching value output relay J1 are closed; when T isBC<TBWhen the circuit is started, normally open contacts K011 and K012 of J1 are disconnected;
(6) when T isBW>TwWhen the output of the output driving unit X02 is at a high level, the normally open contacts K021 and K022 of the first switching value output relay J2 are closed; when T isBW<TwWhen the current is detected, normally open contacts K021 and K022 of J2 are disconnected;
(7)TBCand TWCAnd sending the temperature value to a liquid crystal touch display screen in real time for displaying.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The first embodiment is as follows: fig. 1 is a structural diagram of a water temperature collecting and controlling device for a heating cabinet of a commercial dishwasher in the present embodiment, which mainly comprises:
the first thermistor is used for collecting the temperature of the heating box, and an R25 ═ 10k type NTC thermistor, namely an RT1 in fig. 2, is selected;
a second thermistor for collecting the temperature of the main washing tank, wherein the R25 ═ 10k type NTC thermistor, i.e. RT2 in fig. 2 is selected;
the preposed signal conditioning unit is shown in fig. 2, wherein a U2 chip TL431 generates a thermistor driving voltage 3.997V, and VREF1 and VREF2 are respectively generated by isolated driving of an operational amplifier U1. The thermistor is connected with another 10k high-precision resistor in series, the voltage division is output to a rear-end resistance-capacitance filter network, and voltage signals ADB1 and ADB2 are output through the isolation drive of the U3 operational amplifier.
The main controller needs to complete digital-to-analog conversion of analog voltage signals of the ADB1 and the ADB2, compare the analog voltage signals with the temperature control setting of the liquid crystal touch display screen, and control the output driving unit to output according to the comparison result.
As shown in fig. 3, the output driving unit outputs control signals X01 and X02 to isolate output control signals X011 and X021 via opto-couplers OPT1 and OPT2, the output control signals in turn control the U1 darlington tube array to output control signals X012 and X022, and the output driving unit controls the control coils of the output relays J1 and J2 respectively to realize the output of the first switching value and the second switching value.
The first switching value is the passive contacts K011 and K012 of output drive unit relay J1.
The second switching value is the passive contacts K021 and K022 of the output drive unit relay J2.
The liquid crystal touch display screen is mainly used for temperature control setting input and is also used for real-time temperature display output.
In the above embodiments, the host controller may be implemented using an STM32F101 type chip. The method specifically comprises the following steps:
(1) reading the temperature analog-to-digital conversion value of the thermistor in real time;
(2) comparing and reading the analog-to-digital conversion value of the thermistor with the temperature control setting temperature difference in real time, and driving and controlling the output of the first switching value and the second switching value according to the comparison result;
(3) sending the temperature analog-to-digital conversion value of the thermistor to a liquid crystal touch display screen for displaying in real time;
(4) when a new temperature control setting value is received, the temperature control setting temperature is updated.
In addition, it should be noted that the above mentioned specific values are only used for the purpose of clearly illustrating the design solution of the present embodiment or the description of the preferred embodiment of the present embodiment, and should not be construed as limiting the scope of the present patent. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (4)
1. A temperature control and temperature display device for a commercial dishwasher, the device comprising: the liquid crystal touch control display screen comprises a first thermistor, a second thermistor, a preposed signal conditioning unit, a main controller, an output driving unit, a first switching value, a second switching value and a liquid crystal touch control display screen, wherein:
the first thermistor is used for collecting the temperature of a heating box of the commercial dishwasher;
the second thermistor is used for collecting the temperature of a main washing box of the commercial dishwasher;
the preposed signal conditioning unit is used for preposing and conditioning the temperature of the heating box acquired by the first thermistor and the temperature of the main washing box acquired by the second thermistor to respectively obtain analog voltage signals corresponding to the temperature of the heating box and the temperature of the main washing box, and the first thermistor and the second thermistor are respectively connected with the preposed signal conditioning unit through signal wires;
the main controller is used for receiving the analog voltage signal in the preposed signal conditioning unit, performing digital-to-analog conversion on the received analog voltage signal corresponding to the temperature of the heating box and the temperature of the main washing box to obtain a quantized digital signal corresponding to the temperature of the heating box and the temperature of the main washing box, comparing the quantized digital signal with a temperature control setting signal of the liquid crystal touch display screen, and obtaining control signals of a first switching value and a second switching value according to a comparison result;
the output driving unit is used for receiving control signals of a first switching value and a second switching value of the main controller and sending the control signals to the first switch and the second switch;
a first switch for controlling a heater in the heating box according to the received control signal;
a second switch for controlling the heater of the main washing tank according to the received control signal;
and the liquid crystal touch display screen is used for inputting the set control temperature and displaying the temperature of the commercial dishwasher in real time.
2. The apparatus of claim 1, wherein the preposed signal conditioning unit, which forms a precision reference voltage source by the voltage source chip U2, the precision resistor R1, the precision resistor R2 and the operational amplifier U1, provides a drive for the NTC thermistors RT1 and RT2, and the thermistor voltage signal is output by the U3 isolation drive.
3. The apparatus of claim 1 wherein the output drive unit isolates the control signal from the output drive signal using opto-couplers OPT1 and OPT 2.
4. The apparatus of claim 1, wherein the first switching quantity is a passive normally open contact of output relay J1 and the second switching quantity is a passive normally open contact of output relay J2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922371651.2U CN211834286U (en) | 2019-12-25 | 2019-12-25 | Temperature control and temperature display device for commercial dish washing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922371651.2U CN211834286U (en) | 2019-12-25 | 2019-12-25 | Temperature control and temperature display device for commercial dish washing machine |
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| CN211834286U true CN211834286U (en) | 2020-11-03 |
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