CN201368644Y

CN201368644Y - Energy-saving temperature-controlled protector

Info

Publication number: CN201368644Y
Application number: CNU2009200883593U
Authority: CN
Inventors: 朱先庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-01-18
Filing date: 2009-01-18
Publication date: 2009-12-23
Anticipated expiration: 2019-01-18

Abstract

An energy-saving temperature-controlled protector belongs to the field of temperature controllers of various refrigerators and freezers and comprises a voltage change, rectification voltage stabilization unit, a temperature detection unit, a temperature return difference control unit, a time-delay circuit protection against repeated start and an on-off control unit. An adjustable bridge circuit comprising a temperature sensor, a potentiometer and other components provides electric bridge unbalanced voltage arising from temperature change to the positive and negative input terminals of an electric bridge detection comparator. The sliding terminal of the potentiometer provides an adjustable temperature set voltage to the non-inverting input terminal of the electric bridge detection comparator, the output voltage of the electric bridge detection comparator provides operating voltage to both the on-off control unit and the time-delay circuit, and the on-off control circuit is, at the same time, controlled by the time-delay circuit and the temperature return difference control circuit; and a refrigerator or a freezer operates and stops under the joint control of the four circuits. The set temperature of energy-saving temperature-controlled protector provided by the utility model can be optionally adjusted between minus 30 DEG C and minus 10 DEG C, and the temperature change of the refrigerating chamber of the refrigerator can be accurately controlled within 1 DEG C, so as to achieve thermostatic control. The constant temperature refrigeration enables the refrigerator not to generate common odors, so that the refrigerator can store various foods without taint of odor, and the fresh-keeping period and the shelf-life period of fresh vegetables and fruits can reach or exceed the level of a special refrigerator or freezer. The energy-saving temperature-controlled protector can prevent repeated start of a compressor to prolong the service life of the refrigerator.

Description

Energy-conservation temperature-control protector

One, technical field:

Energy-conservation temperature-control protector relates to refrigerator, the necessary a kind of parts of refrigerator-freezer.

Two, background technology:

The temperature controller that uses in present refrigerator, the refrigerator-freezer, all can not accurately control temperature, the temperature fluctuation excursion is at 3.6 ℃--and-8 ℃, (the temperature fluctuation excursion is greatly the main root that wastes energy) and variations in temperature do not have rule, so the taint of odour of varieties of food items, fresh-keeping, time of guaranteeing the quality can not get guaranteeing.The more important thing is that compressor can cause stall to burn easily by repeated priming, compressor can not get effective protection.Traditional mechanical temperature controller, the fault rate height, appearance and size is different can not exchange.The minority product uses the temperature controller of other version, and its cost is higher, different because its planform reaches by the dress using method, can not exchange with other temperature controller.

Three, summary of the invention:

The controlled ice making the temperature inside the box of apparatus of the present invention excursion is less than 1 ℃, and economize on electricity does not have common refrigerator stink more than 30%.Prolong fresh-keeping, the shelf-life of varieties of food items, compressor is repeated priming continuously, effectively protects compressor, prolongation compressor service life.

This device is to be made of voltage transformation and rectifying and voltage-stabilizing, temperature detection, the control of temperature return difference, delay circuit (preventing the repeated priming protection), switch control unit.This device circuit mainly is that the adjustable electric bridge circuit that original papers such as temperature sensor and potentiometer are formed provides the electric bridge that causes because of variations in temperature unbalance voltage to the positive-negative input end of electric bridge detection comparator, the sliding end of potentiometer provides adjustable temperature setting voltage to the in-phase input end of electric bridge detection comparator, the output voltage of electric bridge detection comparator provides operating voltage to switch control and delay circuit respectively, ON-OFF control circuit is subjected to the control of delay circuit and temperature return difference control circuit again simultaneously, and refrigerator, refrigerator-freezer move under the common control of these four circuit and stop.Temperature sensor uses specification to be R ₂₅=10K Ω B _25/85The high sensitivity NTC semiconductor thermistor of=3435K.This installs whole sealing and fixing in the rectangular case fire-retardant, that insulating materials is made.

Apparatus of the present invention can be between subzero 30 ℃-10 ℃ above freezing be adjusted arbitrarily, and perfect solution the shortcoming and the deficiency of various temperature controllers, possess following six characteristics:

1, the controllable temperature excursion reaches constant temperature less than 1 ℃, can economize on electricity more than 30%.(because of reach as high as 50% or more different of heat-insulating property of each refrigerator ice cabinet) with seal degree

2, constant temperature refrigeration can make refrigerator not produce common refrigerator stink.

3, constant temperature store various types food can make its not taint of odour, and fresh-keeping, the shelf-life of fresh vegetables, fruit can meet or exceed the shelf-life level of professional refrigerator ice cabinet.

4, design has the holding circuit that prevents that compressor from repeating to start, and effectively protects the improper damage of compressor.

5, because temperature control is accurate, compressor is the short time operation, and compressor temperature is no more than 50 ℃, greatly reduces the wear extent of compressor.The service life that can prolong refrigerator is more than 1/3rd (key element of mechanical wear is temperature, the speed of service and time).

6, self power consumption is less than 0.5 watt, and volume is small and exquisite firm, and convenient by dress, all mechanical temperature controllers all can directly be replaced, and the temperature controller of other version is transformed promptly replaceable a little.

Four, description of drawings

Accompanying drawing 1 is the apparatus structure schematic diagram.

Accompanying drawing 2 is circuit theory diagrams.

Five, the specific embodiment

Figure 1 shows that apparatus of the present invention structure, energy-conservation temperature-control protector sealing and fixing is in by the rectangular case fire-retardant, that insulating materials is made 7, and the outside has power outlet 2, temperature sensor 1, temperature to set the regulating handle 3 of potentiometer 4.Inside has voltage transformation and rectifying and voltage-stabilizing 5 and temperature control to protect 6 assembly circuit plates.

Figure 2 shows that apparatus of the present invention circuit theory diagrams, power supply [voltage transformation and regulator rectifier circuit belong to the circuit common (not shown)] provides 12 volts of dc sources, main components and parts: temperature sensor R _tUse specification to be R ₂₅=10K Ω B _25/85The high sensitivity NTC semiconductor thermistor of=3435K, electric bridge uses three terminal regulator 78L05 with reference voltage IC1, electric bridge detection comparator A1, delay circuit comparator A2 and temperature return difference control comparator A3 use integrated circuit four voltage comparator LM339, the relay J model of control compressor is LZC-23F (ZN4123), relay switch control BG uses the C945 triode, and the adjustable part of adjustable electric bridge is that temperature is set 0.5 watt of 50K Linear Carbon membrane potentiometer of potentiometer use.

The circuit working principle is as follows:

When temperature was higher than design temperature, the voltage that electric bridge a is ordered was lower than the voltage that b is ordered, electric bridge detection comparator A1 output HIGH voltage, relay switch control BG turn-on relay adhesive compressor operating.The high voltage of electric bridge detection comparator A1 output charges to capacitor C through diode D5, D6 simultaneously, and C is filled electricity very soon, because of the forward voltage drop effect of diode D6, and delay circuit comparator A2 output HIGH voltage.If power supply instant cut-off, energising or adjustment W change the temperature setting voltage at this moment, because of capacitor C, electricity has been filled the anti-phase blocking-up of diode D6, and delay circuit comparator A2 is output as zero, although the voltage that electric bridge a is ordered is lower than the voltage that b is ordered.Compressor can not start at once, treats that capacitor C discharge finishes to recover operate as normal.The high voltage of electric bridge detection comparator A1 output makes also output HIGH voltage of temperature return difference control A3 through diode D5, D4, and relay switch control BG keeps conducting, compressor operate as normal.

When temperature drops to when being lower than design temperature, the voltage that electric bridge a is ordered is higher than the voltage that b is ordered, and electric bridge detection comparator A1 is output as zero, and relay switch control BG circuit opening relay device disconnects compressor and quits work.Delay protection comparator A2 is owing to capacitor C, and electricity is filled, and delay circuit comparator A2 is output as zero.Simultaneous temperature return difference control comparator A3, because of the effect of Zener diode D2, the in-phase input end that makes the temperature return difference control comparator A3 is lower than fixed value of inverting input and is output as zero.Compressor keeps stopping.

When the voltage of ordering to electric bridge a when temperature recovery was lower than the voltage that b orders, Zener diode D2 made the in-phase input end of temperature return difference control comparator A3 be lower than fixed value of inverting input.Temperature return difference control comparator A3 output still is zero.Again because the output of electric bridge detection comparator A1, delay circuit comparator A2, temperature return difference control comparator A3 links together.So when the voltage of ordering to electric bridge a when temperature recovery was lower than the voltage that b orders, relay switch control BG still can not conducting, compressor is not worked.Finish until the capacitor C discharge, temperature is given birth to high in-phase input end voltage to temperature return difference control comparator A3 and is higher than inverting input voltage.Electric bridge detection comparator A1, delay circuit comparator A2, the common output HIGH voltage of temperature return difference control comparator A3, relay switch control BG conducting, compressor is operate as normal again.

Claims

1, a kind of energy-conservation temperature-control protector, this device are to be made of voltage transformation and rectifying and voltage-stabilizing, temperature detection, the control of temperature return difference, delay circuit (preventing the repeated priming protection), switch control unit.It is characterized in that: this circuit mainly is that the adjustable electric bridge circuit that original papers such as temperature sensor Rt and potentiometer W are formed provides the electric bridge that causes because of variations in temperature unbalance voltage to the positive-negative input end of electric bridge detection comparator A1, and the sliding end of potentiometer W provides adjustable temperature setting voltage to the in-phase input end of electric bridge detection comparator A1.The output voltage of electric bridge detection comparator A1 provides operating voltage to switch control BG and delay circuit comparator A2 respectively, and switch control BG is subjected to the control of delay circuit comparator A2 and temperature return difference control comparator A3 again simultaneously.Refrigerator, refrigerator-freezer move under the common control of these four circuit and stop.All mechanical temperature controllers all can directly be replaced use.

2, a kind of energy-conservation temperature-control protector according to claim 1 is characterized in that: temperature sensor is that specification is R ₂₅=10K _ΩB _25/85The high sensitivity NTC semiconductor thermistor of=3435K.

3, a kind of energy-conservation temperature-control protector according to claim 1, it is characterized in that: this installs whole sealing and fixing in by the rectangular case fire-retardant, that insulating materials is made.