CN2473573Y

CN2473573Y - Computer controller for cold storage

Info

Publication number: CN2473573Y
Application number: CN 01202238
Authority: CN
Inventors: 王和; 易小林; 孟燕军
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-21
Filing date: 2001-02-21
Publication date: 2002-01-23
Anticipated expiration: 2011-02-21

Abstract

The utility model relates to a cold storage temperature controller, and the structure is composed by a temperature detection unit, a keyboard, a display unit, a single chip microcomputer, a voltage monitoring circuit, and a relay unit, etc. The single chip microcomputer is connected with each unit and circuit respectively. The utility model can control the refrigerator temperature within the range user arranged automatically, and can realize automatic operation of the cold storage refrigeration and defrosting unmanned, the voltage monitoring circuit can realize the reliable start-stop of the controller, and the parameters arranged can be kept for a long time under the power-off circumstance. The utility model is suitable for the commercial refrigeration, cold storage equipment, and the refrigeration systems of the industry, medical, etc.

Description

The freezer computer controller

The utility model relates to a kind of control device, specifically a kind of temperature controller.

Existing freezer generally is the work forced refrigeration cooling by refrigeration machine, and defrosting then is to utilize defrosting equipment to carry out.Normal program control device or the electric apparatus control apparatus of adopting of the start and stop control of refrigeration machine.Though this class control device can be controlled the operation of refrigeration machine effectively, temperature of ice house is remained under the design temperature, then can not control automatically defrosting.Each defrosting all needs to manually start defrosting equipment and defrosts, after defrosting is finished again Artificial Control change refrigeration over to.This mode of operation is relatively backward and loaded down with trivial details.In addition, when the power failure timed unit can not be preserved the running parameter of setting, need manually reset parameter behind the incoming call; When voltage ripple of power network was big, the work of control device was also unstable, can not guarantee the reliable start and stop of refrigeration machine.

The purpose of this utility model just provides a kind of novel freezer computer controller, with refrigeration, the full-automatic operation of defrosting unattended duty that realizes freezer.

The utility model is achieved in that the freezer computer controller is made up of temperature detecting unit, keyboard, display unit, single-chip microcomputer, voltage monitoring circuit and relay unit, and single-chip microcomputer is connected with each unit and circuit respectively.This device is main control unit with the single-chip microcomputer, keyboard is finished parameter and is set task, temperature detecting unit detects temperature of ice house, voltage monitoring circuit is realized reliable start and stop, and the parameter that long preservation is set under power-down conditions, display unit shows operating temperature when work, show relevant parameters when parameter is set, the work of relay unit control refrigeration machine and defrosting equipment.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is a structured flowchart of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Fig. 3 is a computer program block diagram of the present utility model.

The utility model as shown in Figure 1, partly form by temperature detecting unit 1, keyboard 2, display unit 3, single-chip microcomputer 4, voltage monitoring circuit 5 and relay unit 6 etc., single-chip microcomputer 4 is a main control unit, is connected the work of control each several part respectively with each unit and circuit.

Fig. 2 is a kind of specific implementation of the present utility model, its structure is to be connected to function key, crystal oscillating circuit in single-chip microcomputer U1 periphery, also be connected to display driver circuit U2 and voltage monitoring circuit U3, the output of U3 connects the 9 pin preset ends of single-chip microcomputer U1, and light-emitting diode display U4 and display driver circuit U2 join.Single-chip microcomputer U1 selects the 80C51 single-chip microcomputer for use, and display unit 3 comprises display driver circuit U2 and light-emitting diode display U4, and wherein display driver circuit U2 is made up of the 74LS164 chip of three serial connections, and light-emitting diode display U4 is 3 figure place sign indicating number display LA5051.Voltage monitoring circuit U3 is the X25045 chip of band EEPROM, and the 9 pin preset ends (RESET) of its 7 pin output RST and single-chip microcomputer U1 join.

The function key of this device is provided with " defrosting cycle key ", " defrosting time key ", " temperature upper limit key ", " lowest temperature key ", " increase key ", " minimizing key " totally six.Preceding four keys are in order to setup parameter or observe the original parameter of setting, and back two keys are in order to change the size of setting value.

Be connected to port PIN2 and resistance R 1, capacitor C 1 altogether at 1,2 pin of single-chip microcomputer U1, digital temperature sensor is connected in the port PIN2, transfers to single-chip microcomputer in order to the temperature of ice house signal that will detect.16,17 pin of single-chip microcomputer U1 meet port PIN3 through resistance R 2 and R3 respectively, and the relay of control refrigeration machine and defrosting equipment is connected in the port PIN3.Relay is accepted the instruction of single-chip microcomputer and break-make, with the start and stop of control refrigeration machine or defrosting equipment.

For preventing that the stranger from arbitrarily pressing function key, revise parameter or the defrosting arbitrarily in violation of rules and regulations set, this controller is connected with port PIN1 at 3,4 pin of single-chip microcomputer U1, forces defrosting and parameter configuration switch to be connected in the port PIN1.This switch and port PIN1 can be arranged on the shelter of controller, or special locking, personal management.Only under the situation of this switch open, just can force to defrost or the modification of parameter.Guarantee the functional reliability of this controller thus.

The course of work of the present utility model (referring to Fig. 3) is: start, single-chip microcomputer U1 initialization is read in parameters from the EEPROM of voltage monitoring circuit U3, detect temperature of ice house by digital temperature sensor then.If temperature of ice house is higher than design temperature, then single-chip microcomputer instruction refrigeration relay is connected, and refrigeration machine is started working, the adjusting of freezing.After next thermometric time arrives, measure temperature again, compare, be lower than the design temperature lower limit until temperature, the relay end leaves refrigeration machine.When temperature progressively rose and surpass the temperature upper limit of setting, this controller action made refrigeration machine restart work, so moves in circles.

In the course of work of this controller, when defrosting cycle arrives,, then close the refrigeration lamp if freeze this moment, close refrigeration machine, clear refrigeration sign, the zero clearing of refrigeration time-delay simultaneously.Discharge white lamp then from, discharge white equipment from, the automatic defrosting sign is set, defrosting cycle and defrosting time zero clearing.Arrive when the time that defrosting is finished, then close the defrosting lamp, close defrosting equipment, clear automatic defrosting sign.When freezer need be forced to defrost, at first open the pressure defrost switch, close the refrigeration lamp, stop refrigeration machine, and delay time 200 milliseconds.Equally defrost with above-mentioned program then.

When need change freezer running parameter also is to open the parameter configuration switch earlier, revises parameter again, establishes modified logo.Turn-off the parameter configuration switch then, then the data of this modification are by among the instantaneous EEPROM that writes voltage monitoring circuit U3.

The utility model can be controlled at temperature of ice house in the scope of user's setting automatically, and can realize freezer refrigerating, the defrosting unattended duty fully automatic operation, voltage monitoring circuit can be realized the reliable start and stop of controller, and the parameter of can long preservation under power-down conditions setting.Parts such as temperature sensor and relay all are installed in the private port, make maintenance and change easy.This device is applicable to commercial freezing, refrigerating equipment, and in the refrigeration system of industries such as industry, medical treatment.

Claims

1, a kind of freezer computer controller, it is characterized in that this controller is made up of temperature detecting unit (1), keyboard (2), display unit (3), single-chip microcomputer (4), voltage monitoring circuit (5) and relay unit (6), single-chip microcomputer (4) is connected with each unit and circuit respectively.

2, freezer computer controller according to claim 1 is characterized in that:

A, be connected to function key, crystal oscillating circuit in single-chip microcomputer U1 periphery, also be connected to display driver circuit U2 and voltage monitoring circuit U3, the output of U3 connects the 9 pin preset ends of single-chip microcomputer U1, and light-emitting diode display U4 and display driver circuit U3 join,

B, be connected to port PIN2 and resistance R 1, capacitor C 1 altogether at 1,2 pin of single-chip microcomputer U1, digital temperature sensor is connected in the port PIN2,

16,17 pin of c, single-chip microcomputer U1 meet port PIN3 through resistance R 2 and R3 respectively, and the relay of control refrigeration machine and defrosting equipment is connected in the port PIN3.

3, freezer computer controller according to claim 1 is characterized in that being connected with port PIN1 at 3,4 pin of single-chip microcomputer U1, forces defrosting and parameter configuration switch to be connected in the port PIN1.