CN2709895Y - Automatic control device for temp. of refrigeration chamber of indirect freezing refrigerator - Google Patents
Automatic control device for temp. of refrigeration chamber of indirect freezing refrigerator Download PDFInfo
- Publication number
- CN2709895Y CN2709895Y CN 200420041845 CN200420041845U CN2709895Y CN 2709895 Y CN2709895 Y CN 2709895Y CN 200420041845 CN200420041845 CN 200420041845 CN 200420041845 U CN200420041845 U CN 200420041845U CN 2709895 Y CN2709895 Y CN 2709895Y
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- air door
- signal
- temperature
- permanent magnet
- electromagnet
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Abstract
The utility model discloses an automatic control device for temperature of refrigeration chamber of indirect freezing refrigerator, comprising a temperature sensor arranged between a refrigerating chamber and a cold storage chamber, an electrical signal regulating circuit, an electromagnetic discharge regulator, an air door and a permanent magnet fixed on the air door; the electrical signal regulating circuit is connected with a direct-current power supply; a power supply temperature sensor through a directing line is connected with the electrical signal regulating circuit; the electrical signal regulating circuit converts the signal of the temperature sensor into a voltage signal; the voltage signal is activated on a magnet coil of an electromagnetic discharge regulator; an electromagnet on the discharge regulator controls the rotating of the air door. The strength of the temperature signal decides the magnitude of the magnetic force so as to control the opening of the air door and obtain the purpose of reasonable allocation for cold current in the refrigerating chamber and the cold storage chamber; compared with the traditional accordion pipe temperature sensing total mechanical air door system, the utility model increases the accuracy of temperature measurement and cold current allocation and reduces the energy consumption.
Description
Technical field
The utility model relates to a kind of temperature of refrigerating chamber automaton, particularly a kind of temperature of refrigerating chamber automaton that is applicable to the indirect-cooling fridge-freezer of computer temperature control.
Background technology
The control of indirect-cooling electricity fridge-freezer temperature of refrigerating chamber is to flow to the throttle opening that refrigerating chamber and refrigerating chamber cold airflow distribute and realize by regulating a control.Damper positions is refrigerating chamber above it as shown in Figure 1, is refrigerating chamber below, and evaporimeter 01 and fan 02 are arranged between refrigerating chamber and the refrigerating chamber, and condenser 03 hangs over the back side, and compressor 05 is arranged on the bottom, and air door 301 is arranged on above the refrigerating chamber.
Traditional control device is made up of the air door of temperature-sensitive bag and bellows control, sees Fig. 2.
When temperature of refrigerating chamber raise, power pressure raise in the bellows 201, and bellows expansion makes bar 202 promote air door 301, and air door 301 open degree increase, and the cold air amount that flows into refrigerating chamber increases, and temperature of refrigerating chamber reduces.When temperature of refrigerating chamber reduced, bellows 201 internal pressures reduced, and spring 203 reduces air door 301 open degree, and the cold air amount that flows into refrigerating chamber reduces, and temperature of refrigerating chamber rises.
Cold air in the refrigerating chamber at first will heat the temperature-sensitive incrustation, because the temperature-sensitive incrustation has bigger thermal inertia, causes response lag; And the working medium in the temperature-sensitive bag passes to needle by film with pressure, because of the machining accuracy of film and install and all can influence its be stressed distortion that produces and sensitivity of distortion, so be difficult to the degree of regulation that reaches higher.
Summary of the invention
Because the hysteresis quality and the inexactness of the control of conventional temperature control device have influenced the precision of control and the promptness of control, for this reason, the utility model proposes the temperature of refrigerating chamber automaton based on electronic technology.
The technical scheme that the utility model is taked is, the automatic temperature control of indirect-cooling household refrigerator-freezer, include the temperature sensor between household refrigerator-freezer, one signal of telecommunication modulate circuit, an electromagnetic flow adjuster, air door and be fixed on permanent magnet on the air door are connected with dc source on the signal of telecommunication modulate circuit; Power supply temperature sensor is connected with signal of telecommunication modulate circuit by lead, by the signal of telecommunication modulate circuit signal of temperature sensor is converted to voltage signal, and voltage signal is acted on the solenoid of electromagnetic flow adjuster, by the rotation of the magnet control air door of electromagnetic flow adjuster.
Some other characteristics of the present utility model are, described electromagnetic flow adjuster, electromagnet, permanent magnet and spring by belt coil constitute, air door is connected with spring, permanent magnet is arranged on the air door, gapped between permanent magnet and the electromagnet, when the control signal of the form of voltage acts on the electromagnet coil two ends, electromagnet and permanent magnet produce the effect of repulsion, the promotion permanent magnet moves, the drive air door is rotated, and the spring that is connected with air door simultaneously is compressed, and balances each other up to the reaction force that spring produced and the thrust of electromagnet.
Described sensor adopts thermistor, and thermistor adopts metal oxide sintering such as Mn, Ni, Co to form.
Indirect-cooling fridge-freezer cool room temperature control apparatus of the present utility model, it can be according to the aperture or the rotation of the stepless damper of variation of temperature in the refrigerating chamber, and then adjusting temperature of refrigerating chamber, the utility model is compared with traditional bellows-type temperature system, the control accuracy height is arranged, be quick on the draw advantage such as adjustable range is big.
The electromagnetic flow adjuster that adopts in this device, mix related circuit and can realize stepless control valve opening, at fluid pressure is not very big, when valve rod travel is not very big, has compared more practical value with pneumatic type with liquid drive-type step-less adjustment valve.
The ratio range of the refrigerating chamber of application of the present utility model and the dischargeable capacity of refrigerating chamber is: 0.5～10.The freezer temperature scope is-6 ℃ to-60 ℃; The temperature of refrigerating chamber scope is 0 ℃～12 ℃.
Description of drawings
Fig. 1 is air door installation site figure;
Fig. 2 is a temp sensing type air damper controller schematic diagram, and wherein symbolic representation is, 201-bellows, 202-catch bar, 203-spring, 301-air door;
Fig. 3 is a device schematic diagram of the present utility model, and wherein symbolic representation is, 301-air door, 302-temperature sensor, 303-lead, 304-permanent magnet, 305-electromagnetic flow adjuster, 306-signal of telecommunication modulate circuit, 307-dc source;
Fig. 4 is temperature acquisition and air door control flow chart;
Fig. 5 is that temperature signal is to voltage signal change-over circuit figure;
Fig. 6 is an electromagnetic flow adjuster schematic diagram, and wherein symbolic representation is, 601-electromagnet, 304-permanent magnet, 603-spring;
Fig. 7 is an electromagnetic type air door structure schematic diagram of the present utility model, and wherein symbolic representation is, the 701-air channel, the 702-fan, 703-evaporimeter, 301-air door, the 705-rotating shaft, the 304-permanent magnet, 707-spring, 307-dc source, the 709-set screw, the 710-iron core, 711-coil, 306-signal of telecommunication modulate circuit;
Fig. 8 is signal of telecommunication modulate circuit figure.
The specific embodiment
The embodiment that provides below in conjunction with accompanying drawing and inventor is described in further detail technology contents of the present utility model.
Referring to Fig. 3, shown in Figure 3 is the schematic diagram that device of the present utility model is installed in refrigeration plant, also is an embodiment of the present utility model.It comprises: the temperature sensor 302 between household refrigerator-freezer, also have a signal of telecommunication modulate circuit 306, an electromagnetic flow adjuster 305, air door 301 and be fixed on permanent magnet 304 on the air door 301, be connected with dc source 307 on the signal of telecommunication modulate circuit 306;
Device is divided into two big major parts: 1. selection of temperature signal and follow-up signal of telecommunication modulate circuit; 2. operating part comprises electromagnetic flow adjuster 305 and rotary air door 301.It below is detailed explanation.
First's selection of temperature signal and processing:
Adopt thermistor material as temperature sensor.Though traditional copper or platinum thermistor can accurately be measured, temperature-coefficient of electrical resistance is lower, is not suitable for using in fridge-freezer.Recently Yan Zhi the thermistor material resistance that is formed by metal oxide sintering such as Mn, Ni, Co is higher 10 times than RTD approximately with the variation of temperature rate, is quick on the draw.This material can satisfy the requirement of thermometric accuracy in the fridge-freezer as temperature sensor.
The workflow of automatic temperature control is as shown in Figure 4:
The resistance of thermistor has the characteristics that raise and reduce with temperature, when so temperature of refrigerating chamber changes, the thermistor resistance that is arranged in the refrigerating chamber also changes thereupon, and process temperature signal shown in Figure 5 is converted to the circuit of voltage signal, changes the thermistor change in resistance into voltage change.Circuit is made of resistance R 0, R1, R2, R3, R4, R5, R9, Rw, Rt and power supply E, and wherein Rt is the thermistor that is arranged in refrigerating chamber, and U1 is an output voltage, takes out from resistance R 9.This circuit adopts balanced bridge three-wire system connection, has eliminated the error that conductor resistance brings with surrounding environment change.
The conditioning of voltage signal: the U1 value of circuit output shown in Figure 4 is less, if act directly on the coil two ends, the electromagnetic force of generation is little, error is big, so will be with U1 earlier by operational amplifier (referring to Fig. 8), after filtering high-frequency signal, and its peak value is handled output voltage U 2.During the peak that makes temperature reach to set, rotary air valve complete opening under the effect of U2 (being that air door rotates to the place that makes cold air actual internal area maximum), when temperature during for the minimum set, U2 is zero.
If the refrigeration indoor temperature raises, the thermistor Rt resistance among Fig. 4 reduces, and U1 voltage raises.U1 amplifies by operational amplifier shown in Figure 8, filters out high-frequency signal then, and is added in slide rheostat R4 two ends, from 2 outputs of slide rheostat R4 intercepting voltage U.Therefore U2 also increases with the variation of U1.U2 is added in coil 611 two ends.So voltage becomes big on the coil 611, it is big that electromagnetic force becomes.When temperature is elevated to setting value when above, electromagnetic force begins greater than spring force, and electromagnetic force is ordered about rotary air valve and turned clockwise, and the cold air quantitative change that enters in the refrigerating chamber is big, makes temperature of refrigerating chamber reduce.Meanwhile spring force becomes greatly gradually, and the rotary air valve motion stops when spring force and electromagnetic force equilibrium, and aperture keeps.Reached control successively, and then regulated the purpose of temperature of refrigerating chamber rotary air valve.
In sum, this part is converted into the signal of telecommunication that is easy to regulate control by thermistor with temperature signal, and by temperature-compensating, amplification, filtering, shaping circuit generation effect produce needed control voltage.
Owing to select for use the thermistor temp coefficient higher, U1 can reach the 10mv magnitude, in processing procedure distortion little, can reflect variation of temperature more accurately, and can regulate easily according to actual needs.Its fidelity and versatility all are better than traditional bellows-type temperature-sensitive system.
Second portion: electromagnetic flow adjuster, rotary air door
Its structural principle as shown in Figure 6, electromagnet 601, permanent magnet 304 and spring 203 by belt coil constitute, it is extraneous when control signal is acted on the electromagnet coil two ends with the form of voltage, the effect that electromagnet 601 and permanent magnet 602 produce repulsion, promoting permanent magnet 304 moves right, with spring 603 compression, the reaction force that is produced up to spring 603 and the thrust of electromagnet 601 balance each other.
Equilibrium equation can be represented by the formula:
P(L，U)＝K·L
P: electromagnetic force
K: spring rate
L: the displacement of controlled device
U: coil both end voltage
By following formula as can be known, after the specification of selected element was determined, the displacement L of controlled device was the monotropic function of voltage U.Therefore can control the position of controlled device by regulation voltage.Controlled device just can realize the step-less adjustment of flow if the valve of pipeline.
Existing hydraulic pressure or pneumatic type drive valve also can realize step-less adjustment, but structure is wanted relative complex, and this novel flow regulator is directly driven by the signal of telecommunication, because the signal of telecommunication is easy to obtain, be easy to control, therefore compare the control accuracy height with top two kinds of type of drive, be quick on the draw characteristics easy to use.Because electromagnetic drive mode requirement controlled device stroke can not be oversize, driving force can be very not big yet.Therefore valve rod travel was not very big situation when the most suitable pressure that is applied to fluid was not very big, valve opening and closing.
It specifically is applied in the control of indirect-cooling fridge-freezer, can adopt following structure:
1, electromagnetic type rotary air valve structure as shown in Figure 7.
Under the normal condition, do not have electric current on the magnet spool 711, air door 301 is in position shown in Figure 7 by the thrust of spring 707 and the suction of permanent magnet.Conducting after signal of telecommunication modulate circuit 306 is received control signal is at coil 711 two ends on-load voltages; Coil 711 and iron core 710 generation magnetic force and the permanent magnet 304 that is bonded on the air door 301 are had an effect, and inhale promotion air door 301 and turn clockwise, and spring 707 is also further compressed simultaneously.Tensile force f=the KL of spring 707, along with the rotation of rotary air valve constantly becomes big, in the time of F (spring)=F (electromagnetism), air door 301 stress balances, equalising torque, stop motion.The voltage that power supply loads is big more, and the aperture of air door 301 is also just big more.Behind loss of voltage, magnetic force disappears thereupon, and air door 301 resets.
Set screw 709 plays the effect of regulating spring elastic force.
Fig. 8 is a signal of telecommunication modulate circuit, and this circuit comprises amplification and filtering and output; Form by resistance R 7, R8, R10, R11, RF, operational amplifier, capacitor C, U1 enters operational amplifier by resistance R 7, by filtering out high-frequency signal by capacitor C again after the R10 current limliting, and it is worth most handles, output voltage U 2 is taken out from resistance R 11.
Above-mentioned two large divisions combines and has constituted indirect-cooling fridge-freezer cool room temperature control apparatus, it can be according to the aperture of the stepless damper of variation of temperature in the refrigerating chamber, and then adjusting temperature of refrigerating chamber, the utility model is compared with traditional bellows-type temperature system, the control accuracy height is arranged, be quick on the draw advantage such as adjustable range is big.
The electromagnetic flow adjuster that the utility model adopts, mix related circuit and can realize stepless control valve opening, at fluid pressure is not very big, when valve rod travel is not very big, has compared more practical value with pneumatic type with liquid drive-type step-less adjustment valve.
The ratio range of the refrigerating chamber of application of the present utility model and the dischargeable capacity of refrigerating chamber is: 0.5～10.The freezer temperature scope is-6 ℃ to-60 ℃; The temperature of refrigerating chamber scope is 0 ℃～12 ℃.
Below be the embodiment that the inventor provides.
Embodiment 1:
Be applied to three-star BCD-185W indirect-cooling fridge-freezer, comprise temperature sensor, signal of telecommunication modulate circuit, electromagnetic flow adjuster, rotatable air door.Its refrigerating chamber and refrigerating chamber dischargeable capacity ratio are 2.
Fridge-freezer temperature of refrigerating chamber control circuit is as Fig. 4 and shown in Figure 7.
During fridge-freezer work, if refrigerate indoor temperature when setting value is following, the U1 value is low, and current value is also smaller on the coil, and the electromagnetic force of generation is not enough to make air door to open, and air door is in closed condition freezing, refrigeration two Room are separated.
Embodiment 2
Be applied to three-star BCD-150W indirect-cooling household refrigerator-freezer, comprise temperature sensor, signal of telecommunication modulate circuit, electromagnetic flow adjuster, air door.The ratio of its refrigerating chamber and refrigerating chamber dischargeable capacity is 1.
Embodiment 3
Be applied to a star BCD-210W indirect-cooling household refrigerator-freezer, comprise temperature sensor, signal of telecommunication modulate circuit, electromagnetic flow adjuster, air door.The ratio of its refrigerating chamber and refrigerating chamber dischargeable capacity is 3.
Claims (4)
1. automatic temperature control that is applicable to the indirect-cooling household refrigerator-freezer, include the temperature sensor (302) between household refrigerator-freezer, it is characterized in that, also have a signal of telecommunication modulate circuit (306), an electromagnetic flow adjuster (305), air door (301) and be fixed on permanent magnet (304) on the air door (301), be connected with dc source (307) on the signal of telecommunication modulate circuit (306);
Power supply temperature sensor (301) is connected with signal of telecommunication modulate circuit (306) by lead (303), by signal of telecommunication modulate circuit (306) signal of temperature sensor (301) is converted to voltage signal, and voltage signal is acted on the solenoid of electromagnetic flow adjuster (305), regulate the rotation of electromagnet (601) the control air door (301) of (305) by electromagnetic flow.
2. the automatic temperature control of indirect-cooling household refrigerator-freezer as claimed in claim 1, it is characterized in that, described electromagnetic flow adjuster (305) is by the electromagnet (601) of belt coil, permanent magnet (304) and spring (203) constitute, permanent magnet (304) is fixed on the air door (301), air door (301) is connected with spring (203), gapped between permanent magnet (304) and the electromagnet, when the control signal of the form of voltage acts on the electromagnet coil two ends, electromagnet and permanent magnet (304) produce the effect of repulsion, promoting permanent magnet (304) moves, and then drive air door (301) rotation, to be connected the spring compression on the air door (301), balance each other up to the reaction force that spring produced and the thrust of electromagnet.
3. the automatic temperature control of indirect-cooling household refrigerator-freezer as claimed in claim 1 is characterized in that, described sensor adopts thermistor.
4. the automatic temperature control of indirect-cooling household refrigerator-freezer as claimed in claim 3 is characterized in that, described thermistor adopts metal oxide sintering such as Mn, Ni, Co to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420041845 CN2709895Y (en) | 2004-04-27 | 2004-04-27 | Automatic control device for temp. of refrigeration chamber of indirect freezing refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420041845 CN2709895Y (en) | 2004-04-27 | 2004-04-27 | Automatic control device for temp. of refrigeration chamber of indirect freezing refrigerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2709895Y true CN2709895Y (en) | 2005-07-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420041845 Expired - Fee Related CN2709895Y (en) | 2004-04-27 | 2004-04-27 | Automatic control device for temp. of refrigeration chamber of indirect freezing refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2709895Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900496B (en) * | 2009-05-27 | 2012-05-23 | 比亚迪股份有限公司 | Combined radiator |
| CN102538381A (en) * | 2012-02-03 | 2012-07-04 | 合肥美的荣事达电冰箱有限公司 | Refrigerator and ventilation door driving logic control device, system and method thereof |
| WO2018059523A1 (en) * | 2016-09-30 | 2018-04-05 | 青岛海尔股份有限公司 | Refrigerator, and method of controlling switches between refrigerating and freezing functions |
-
2004
- 2004-04-27 CN CN 200420041845 patent/CN2709895Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900496B (en) * | 2009-05-27 | 2012-05-23 | 比亚迪股份有限公司 | Combined radiator |
| CN102538381A (en) * | 2012-02-03 | 2012-07-04 | 合肥美的荣事达电冰箱有限公司 | Refrigerator and ventilation door driving logic control device, system and method thereof |
| CN102538381B (en) * | 2012-02-03 | 2013-11-27 | 合肥美的电冰箱有限公司 | Refrigerator and ventilation door driving logic control device, system and method thereof |
| WO2018059523A1 (en) * | 2016-09-30 | 2018-04-05 | 青岛海尔股份有限公司 | Refrigerator, and method of controlling switches between refrigerating and freezing functions |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |