CN2138765Y

CN2138765Y - Three speed wind blower coil tube temperature controller

Info

Publication number: CN2138765Y
Application number: CN 92244840
Authority: CN
Inventors: 韩旭
Original assignee: QINGHUA ARTIFICIAL ENVIRONMENT ENGINEERING Co BEIJING
Current assignee: QINGHUA ARTIFICIAL ENVIRONMENT ENGINEERING Co BEIJING
Priority date: 1992-12-26
Filing date: 1992-12-26
Publication date: 1993-07-21
Anticipated expiration: 2002-12-26

Abstract

The utility model discloses a three-speed wind blower coil pipe type temperature controller which relates to a temperature controller, and is particularly suitable for adjusting and controlling a three-speed wind blower coil pipe type air conditioner. The three-speed wind blower coil pipe type temperature controller is mainly composed of a temperature sensing circuit, a difference value amplifying circuit, a comparison circuit, and a logical judging and driving circuit. A thermosensitive resistor RT in the temperature sensing circuit and the set electrical potential difference of fixing voltage carries out voltage difference amplification by a difference value amplifying loop which accepts an operation amplifier U1A as the main part. Three return stagnant voltage comparison circuits are orderly connected with a resistor R8, diodes D2, D3, and D4 in series by three operation amplifiers U1B, U1C, and U1D. A relay is controlled by the logical judging and driving circuit to convert the rotary speed of a three-speed wind blower or stop the three-speed wind blower to achieve temperature regulation.

Description

Three speed wind blower coil tube temperature controller

The utility model relates to a kind of temperature controller, especially is applicable to the adjusting control of three fast fan unit tubular type air conditioners.

As everyone knows, the indoor large-area air-conditioning, for example: indoor public places of entertainment such as hotel, restaurant, office and theater, it is to utilize blower fan to rotate generally to adopt three fast fan unit tubular type air conditioners, around blows air over heat or the cooling coil, carry out indoor flow, and with the conversion rotation speed of fan, change is blown into indoor hot blast or cold blast rate, thereby realizes the indoor large-area temperature adjustment.

At present, the conversion of low speed, middling speed, high speed and lock catch in the three common fast fan unit tubular type air conditioners, general rely on the operator after indoor, impression or the thermometer in the observation ward, manual governing or close, not only waste of manpower but also unavoidably cause energy waste to room temperature; Automatically control the startup of blower fan and stop although having occurred mercoid switch, but still can not break away from manpower conversion fan speed.

In view of this, the purpose of this utility model provides a kind of three fast fan coil temperature controllers, be the electric drive mode of sensor, change rotation speed of fan and stopping automatically with thermistor, and can also get rid of the interference in noise source (electric field, magnetic field), reach stable air-conditioner temperature.

The purpose of this utility model is achieved in that it comprises temperature sensing circuit, difference amplifying circuit, comparison circuit and logic judgement drive circuit; The difference amplifying circuit has computing and amplifies U1A, connect resistance R 4, R6 one end simultaneously at its input anode, the input negative terminal connects resistance R 3 one ends, the other end of resistance R 3, R4 connects the A point between potentiometer W1 output B point, resistance R 2 and the thermistor RT of temperature sensing circuit respectively again, while parallel resistance R5 and capacitor C 8 between input negative terminal and output C point, and output C point is exported to the D point through the filter circuit of resistance R 7 and capacitor C 9 compositions; Comparison circuit is by the input anode of operational amplifier U1B, U1C and U1D, is connected to the D point of difference amplifying circuit through resistance R 11, R21 and R31 respectively, and its input negative terminal is connected respectively to E point, F point and G point in resistance R 8, diode D2, D3, the D4 order series circuit, and resistance R 12, R22 and R32 are connected on the input anode of U1B, U1C and U1D and output E ' point, F ' and G ' again; Logic judges that dual input NAND gate U2A double input end, dual input NAND gate U2D double input end and U2B one input, dual input NAND gate U2C one input of drive circuit are connected output E ', F ' point, the G ' point of comparison circuit respectively, and connects relay J H, JM, the JL of relay circuit respectively with H point, I point, the J point of U2A, U2B, U2C output.

Owing to adopt such scheme, can holding chamber in the air-conditioner temperature of area stable, energy savings is saved the labour again simultaneously.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the circuit theory diagrams of an embodiment of the utility model.

In the embodiment shown in fig. 1:

In the temperature sensing circuit 1, potentiometer W0, W1 and W2 connect in proper order, and resistance R 2 and thermistor RT series connection, two series circuit parallel connections.By 5 volts of DC currents of direct-current power supply, thermistor RT passes to about 0.1 milliampere of electric current, because it (is that temperature raises that the pressure drop of thermistor RT and temperature are linear change substantially, pressure drop descends), when room temperature changes, thermistor RT change in resistance, it is the A point voltage variation between R2 and the RT, and the room temperature that is provided with is on request fixed (for example: require 25 ℃ of room temperatures), the voltage that the output B of potentiometer W1 is ordered is fixed (for example: 0.53 volt of voltage), therefore, the potential difference that occurs between A point and the B point, through summer and winter change-over switch K respectively with the resistance R 3 of difference amplifying circuit, the end of R4 connects.

Thermistor RT adopts the MFD-502-35 type, and the resistance value in the time of 16～30 ℃ is respectively 8.025K and 4.619K, and resistance R 2 is 47K, so the pressure drop of thermistor RT changes between 0.73 volt～0.45 volt, average every degree changes 20 millivolts.Adjust potentiometer W0, W2 and make potentiometer W1 when full scale changes, be pressed in 0.73 volt～0.45 volt variation to guarantee that its middle tap powers on.

Shunt capacitance C6 and C7 are in order to suppress the thermal noise of thermistor RT and potentiometer W1, W2 respectively at A point and B point.

In the difference amplifier road 2, the positive and negative end of the input of operational amplifier U1A is electrically connected the end of resistance R 4, R3 respectively, resistance R 6 one ends also are connected the input anode of U1A, resistance R 5 is connected in parallel between the output C point and input negative terminal of operational amplifier U1A, and operational amplifier U1A is to the A point of temperature sensing circuit 1, the voltage difference (V of B point output _A-V _B) carry out the voltage difference amplification, be Vc=(R5/R3 at its output C point output voltage) (V _A-V _B) or Vc=(R5/R3) (V _B-V _A) (under agreement R3=R4, R5=R6 condition), and capacitor C 8 is connected in parallel on and constitutes integrating circuit between the output C point of operational amplifier U1A and the input negative terminal, inhibition output voltage V c has significantly transition; The C point connects the RC filter circuit of resistance R 7, capacitor C 9 formations, and D point voltage V is more milder than C point voltage Vc, and relative other resistance of resistance R 7 values is very little, basically V _D=Vc.

In the comparison circuit 3, resistance R 8, diode D2, D3, D4 connect in proper order, and connecting direct current is 5 volts of voltages in source, obtains 3 voltage ratios respectively than a reference value at E, F, G point, and pressing owing to diode D2, D3, D4 forward conduction is 0.7 volt, then V _E, V _FAnd V _GBe respectively 2.1 volts, 1.4 volts and 0.7 volt; The input negative terminal of operational amplifier U1B, U1C and U1D is connected E point, F point and G point respectively, and the input anode is connected in the output D point of difference amplifying circuit 2 respectively through resistance R 11, R21 and R31, resistance R 12, R22 and R32 are connected in parallel on output E ' point, F ' and the G ' point of operational amplifier U1B, U1C and U1D respectively again, with the input anode, thereby three hysteresis voltage comparators have been constituted, when minor fluctuations appears in V (less than hysteresis voltage), comparison circuit 3 also can frequent variations, and is swift in motion during its state turnover.

Logic judges that drive circuit 4 is to constitute (a slice 7438 integrated packages) by dual input NAND gate U2A, U2B, U2C, U2D and diode D8, wherein the double input end of U2A connects the output E ' point of comparison circuit 3, and output H point connects the relay J H of relay circuit 5; The input of U2B is connected to the H point through diode D8, and the double input end of another input and U2D is connected the output F ' point of comparison circuit 3 together, and the output I point of U2B connects the relay J M of relay circuit 5; The input of U2C connects the U2D output, and another input connects the output G ' point of comparison circuit 3, and output J point connects the relay J L of relay circuit 5.

When U2A was output as high resistant, relay J H discharged, U2A output V _HBe+9 volts,, and seal in diode D8 for fear of the input utmost point that damages U2B; When V was+9 volts, D8 oppositely ended, the suitable high level of an input of U2B, and when the U2A output low level, the D8 forward conduction, an input terminal voltage＜1 of U2B volt, suitable low level, thus reach the control requirement.

Relay circuit 5 has relay J H, JM and JL, is connected with diode D5, D6 and D7 respectively, the resistance R 14 of arc-suppression circuit, capacitor C 11 and resistance R 14 capacitor C 11, resistance 24 capacitor C 12, resistance R 34 capacitor C 31.This relay circuit 5 connects 9 volts direct currents of dc sources, and the contact of relay J H, JM and JL is connected in three loops of four lines formation of three fast blower fan M, thereby controls three fast blower fan M high speeds, middling speed, low speed and halted state.

Below with winter state be example explanation circuit working principle and flow process:

Stir summer and winter change-over switch K upwards, on request and the room temperature that is provided with is 25.5 ℃, sensitivity is 0.5 ℃, at this moment, and V _B=0.53 volt, R5/R3=70.

1) when actual room temperature is higher than 25 ℃, (V _A-V _B)＜10 millivolt, Vc＜0.7 volt then, U1B, U1C, the equal output low level of U1D, U2A, U2B, U2C export high resistant, and JH, JM, JL all discharge, three fast blower fan M halted states.

2) when actual room temperature is between 24.5～25 ℃, 10 millivolts＜(V _A-V _B)＜20 millivolt, then 0.7 volt＜V _C＜1.4 volts, U1D exports high level, and U1B, U1C output low level, U2A, U2B, U2D are high resistant, U2C is a low level, and the JL adhesive, JM, JH discharge, and three fast blower fan M start low speed, so room temperature slowly rises.

3) when between 24～24.5 ℃ of the actual room temperatures, 20 millivolts＜(V _A-V _B)＜30 millivolt, then 1.4 volts＜V _D＜2.1 volts, the U1B output low level, U1C, U1D export high level, and U2A, U2C export high resistant, U2B, U2D output low level, the JM adhesive, JH, JL discharge, and three fast blower fan M start middling speed, so, the room temperature fast rising.

4) when actual room temperature is below 24 ℃, (V _A-V _B) greater than 30 millivolts, V then _D＞2.1 volts, U1B, U1C, U1D all export high level, the U2A output low level, and U2B is output as high resistant, and U2D is output as low level, and U2C is output as high resistant, the JH adhesive, JM, JL discharge, and three fast blower fan M start at a high speed, so, the room temperature fast rise.

As long as summer, state was stirred summer and winter change-over switch K downwards (position as shown in Figure 1), rise with room temperature, then three fast blower fans stop according to occurring, low speed, middling speed, run up, operation principle with above-mentioned winter duty identical, so do not give unnecessary details.

Claims

A kind of three fast fan coil temperature controllers comprise dc source, relay circuit and three fast blower fans, it is characterized in that: further comprising temperature sensing circuit, difference amplifying circuit, comparison circuit and logic and judge drive circuit; The difference amplifying circuit has operational amplifier U1A, connect resistance R 4, R6 one end simultaneously at its input anode, the input negative terminal connects resistance R 3 one ends, the other end of resistance R 3, R4 connects the A point between potentiometer W1 output B point, resistance R 2 and the thermistor RT of temperature sensing circuit respectively again, while parallel resistance R5 and capacitor C 8 between input negative terminal and output C point, and output C point is exported through filter circuit to the D point of resistance R 7 and capacitor C 9 compositions; Comparison circuit is by the input anode of operational amplifier U1B, U1C and U1D, is connected to the D point of difference difference amplifying circuit through resistance R 11, R21 and R31 respectively, and its input negative terminal is connected respectively to E point, F point and G point in resistance R 8, diode D2, D3, the D4 order series circuit, and resistance R 12, E22 and R32 are connected on the input anode of U1B, U1C and U1D and output E ' point, F ' and G ' again; Logic is judged the dual input NAND gate U2A double input end of drive circuit, dual input NAND gate U2D double input end is connected output E ' point, F ' point, the G ' point of comparison circuit respectively with U2B one input, dual input NAND gate U2C one input, and connects relay J H, JM, the JL of relay circuit respectively with H point, I point, the J point of U2A, U2B, U2C output.