CN202125451U - Automatic air cooling control system for control cabinet of oil pumping machine - Google Patents

Abstract

An automatic air-cooling control system for a pumping unit control cabinet, which includes a voltage transformation module, a rectification and voltage stabilization module, a temperature control circuit, a drive circuit and an air-cooling fan, and the voltage transformation module, rectification and voltage stabilization module, and temperature control circuit , the drive circuit and the air-cooled fan are connected in sequence, and the temperature control circuit controls the air-cooled fan through an operational amplifier, a normally open temperature detection switch and a power-off delay relay according to the temperature in the pumping unit control cabinet. The utility model adopts a power-off delay relay, and sends the temperature control signal to the operational amplifier for comparison after the power-off delay relay, which avoids frequently starting and stopping the air-cooled fan near the critical temperature value, and ensures the stable and reliable operation of the air-cooled fan. It provides a reliable working temperature rise space for the pumping unit system, and ensures the stable operation of the components in the pumping unit control cabinet.

Description

Automatic air-cooling control system for pumping unit control cabinet

technical field

The utility model relates to a temperature control system, in particular to an automatic air cooling control system for a pumping unit control cabinet.

Background technique

As we all know, the pumping units in the oil field work all the time in the field all year round, exposed to the wind and the sun. Especially in summer, under the harsh working environment of scorching sun and hot summer, the temperature inside the control cabinet of the pumping unit increases sharply, which cannot provide a suitable working environment temperature for the supporting facilities and circuits in the cabinet, which often causes damage to electrical components, resulting in the failure of the pumping unit. can not work normally. Air-cooling is usually adopted to cool down the control cabinet of the pumping unit, and the suitable working environment temperature range of the circuit of the supporting facilities of the pumping unit is set. When the temperature in the control cabinet of the pumping unit exceeds the set temperature, the air-cooling system is started to cool down , when the temperature drops to the set temperature range, the air-cooling system will stop working, which solves the problem of working temperature control of the circuit in the pumping unit control cabinet to a certain extent, but when the temperature is above and below the set working temperature critical value When fluctuating, the air-cooling system will cause damage to its components due to frequent start-up work, which not only affects the normal operation of the pumping unit, but also causes property losses.

Utility model content

In view of the above deficiencies, the utility model provides an automatic air-cooling control system for the control cabinet of the pumping unit, which can automatically adjust the temperature in the control cabinet of the pumping unit to prevent damage to components in the control cabinet of the pumping unit due to overheating The phenomenon.

The technical scheme adopted by the utility model to solve the technical problems is: the automatic air-cooling control system of the pumping unit control cabinet, including a voltage transformation module, a rectification and voltage stabilization module, a temperature control circuit, a drive circuit and an air-cooling fan. The module, the rectifying and stabilizing module, the temperature control circuit, the drive circuit and the air-cooling fan are connected in sequence, and the feature is that

The voltage transformation module includes a transformer T to convert the high voltage 380V alternating current into a low voltage 15V; the rectification and voltage stabilization module includes a rectifier bridge QZ, a voltage stabilizer U, an inductance coil L, a capacitor C1, a capacitor C2, a capacitor C3, Capacitor C4 and diode D1 are used to convert the 15V alternating current into a stable 12V direct current; the temperature control circuit includes an operational amplifier A, a resistor R1, a resistor R2, a resistor R3, a diode D2, a capacitor C5, and a normally open temperature detection switch KH , delay relay J and delay relay normally open contact K; the drive circuit includes a triode Q1 and a triode Q2;

Wherein, the input side of the transformer T is connected to 380V AC, and the output side is respectively connected to the two input terminals of the rectifier bridge QZ; the positive output terminal of the rectifier bridge is connected to the positive power input terminal pin 1 The negative output end is grounded; the pin 2 of the regulator U is connected in series with the inductance coil L to output 12V DC voltage, the pin 3 and pin 5 are directly grounded, and the pin 4 is connected to the output side of the inductance coil L; The capacitor C1, the capacitor C2, and the capacitor C3 are connected in parallel to the two output terminals of the rectifier bridge QZ respectively; the diode D1 is connected to the input side of the inductance coil L and ground respectively; the capacitor C4 is respectively connected to the inductance coil L The input side of the operational amplifier A is connected to the ground phase; the positive input terminal 3 of the operational amplifier A is connected in series with the normally open contact K of the delay relay to the positive pole of the 12V DC voltage, and the parallel circuit of the diode D2 and the capacitor C5 is connected to the ground at the same time. Reverse input terminal 2 is connected in series with resistor R1 to the positive pole of 12V DC voltage, and output terminal 1 is connected in series with resistor R3 to the b pole of transistor Q1; the normally open temperature detection switch KH is connected in series with resistor R2 to 12V DC voltage The positive pole is connected to the ground; the delay relay J is a power-off delay relay, one end of its coil is connected between the normally open temperature detection switch KH and the resistor R2, and the other end is grounded; the c pole of the triode Q1 is connected to the triode Q2 The b pole of the transistor Q2 is connected to the b pole, the e pole is connected to the pin 3 and pin 4 of the power connector JP of the air-cooled fan, and grounded; the e pole of the triode Q2 is connected to the 12V DC positive pole, and the c pole is connected to the air-cooled fan. The pin 1 and pin 2 of the power connector JP of the fan are connected.

The normally open temperature detection switch KH is arranged on the radiator of the thyristor of the pumping unit.

The transistor Q1 is an NPN transistor, and the transistor Q2 is a PNP transistor.

The beneficial effects of the utility model are: the automatic air-cooling control system of the pumping unit control cabinet adopts a power-off delay relay, and sends the temperature control signal to the operational amplifier for comparison after passing through the power-off delay relay, avoiding the critical temperature value The air-cooling fan is frequently started and stopped nearby to ensure the stable and reliable operation of the air-cooling fan, ensure the stable operation of the components in the pumping unit control cabinet, and provide a reliable working temperature increase space for the pumping unit system.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is a circuit diagram of the utility model.

Detailed ways

As shown in Figure 1 and Figure 2, the automatic air-cooling control system of the pumping unit control cabinet includes a transformer module, a rectifier voltage stabilization module, a temperature control circuit, a drive circuit and an air-cooled fan, and the transformer module, rectifier The voltage stabilizing module, the temperature control circuit, the driving circuit and the air cooling fan are connected in sequence.

The voltage transformation module includes a transformer T to convert the high-voltage 380V alternating current into a low-voltage 15V; the rectification and voltage stabilization module includes a rectifier bridge QZ, a 2576-type voltage regulator U, an inductance coil L, a capacitor C1, a capacitor C2, Capacitor C3, capacitor C4 and diode D1, in order to convert the alternating current of 15V into stable 12V direct current; The temperature control circuit includes LM358 operational amplifier A, resistor R1, resistor R2, resistor R3, diode D2, capacitor C5, set at The normally open temperature detection switch KH on the radiator of the thyristor of the pumping unit, the delay relay J and the normally open contact K of the delay relay; the drive circuit includes an NPN transistor Q1 and a PNP transistor Q2.

As shown in Figure 2, the input side of the transformer T is connected to 380V AC, and the output side is connected to the two input terminals of the rectifier bridge QZ respectively; The terminal pin 1 is connected, and the negative output terminal is grounded; the pin 2 of the voltage regulator U is connected in series with the inductance coil L to output a 12V DC voltage, the pin 3 and pin 5 are directly grounded, and the pin 4 is connected to the output side of the inductance coil L The capacitor C1, the capacitor C2, and the capacitor C3 are connected in parallel to the two output terminals of the rectifier bridge QZ respectively; the diode D1 is connected to the input side of the inductance coil L and the ground respectively; the capacitor C4 is respectively It is connected with the input side of the inductance coil L and the ground; the positive input terminal 3 of the operational amplifier A is connected in series with the normally open contact K of the delay relay and then connected with the positive pole of the 12V DC voltage, and the parallel connection of the diode D2 and the capacitor C5 is connected in series After the circuit is grounded, the reverse input terminal 2 is connected in series with the positive electrode of the 12V DC voltage after the resistor R1 is connected in series, and the output terminal 1 is connected in series with the b pole of the transistor Q1 after the resistor R3 is connected in series; the normally open temperature detection switch KH is connected in series with the resistor R2 respectively It is connected to the positive pole of the 12V DC voltage and the ground; the delay relay J is a power-off delay relay, one end of its coil is connected between the normally open temperature detection switch KH and the resistor R2, and the other end is grounded; the c of the triode Q1 The pole is connected to the b pole of the triode Q2, and the e pole is connected to the pin 3 and pin 4 of the power connector JP of the air-cooled fan, and grounded; the e pole of the triode Q2 is connected to the 12V DC positive pole, and the c The pole is connected with pin 1 and pin 2 of the power connector JP of the air-cooled fan.

When working, the high-voltage 380V AC is transformed into a low-voltage 15V AC, and the low-voltage 15V AC is rectified, filtered and stabilized to output a stable 12V DC to power the control circuit. If the thyristor temperature of the working pumping unit system is normal, the normally open temperature detection switch KH set on the radiator of the pumping unit thyristor is in the off state, and the normally open contact K of the power-off delay relay J is in the off state , Since the voltage of the positive input terminal 3 of the LM358 operational amplifier A is lower than the inverting input terminal 2, the output terminal 1 of the LM358 operational amplifier A is at a low level. If the thyristor temperature of the working pumping unit system rises to a certain temperature, the normally open temperature detection switch KH is turned on, and the power-off delay relay J drives the normally open contact K to close. At this time, the positive input terminal of the LM358 operational amplifier A The voltage of 3 is higher than the inverting input terminal 2, the output terminal 1 of LM358 operational amplifier A is high level, the triode Q1 and triode Q2 are both turned on, and the air-cooled fan starts to work to air-cool the pumping unit control cabinet. After the temperature of the thyristor of the pumping unit decreases, the normally open temperature detection switch KH is disconnected again, but the power-off delay relay does not immediately cut off the input voltage of the positive input terminal 3 of the LM358 operational amplifier A, and delays for a certain period of time ( It can be set) the normally open contact K will be disconnected in the later stage, at this time the voltage of the positive input terminal 3 of the LM358 operational amplifier A is lower than the inverting input terminal 2, the output terminal 1 of the LM358 operational amplifier A is low level, and the transistor Q1 and transistor Q2 are all cut off, and the air-cooling fan stops working.

In this way, the utility model adopts the power-off delay relay, and sends the temperature control signal to the operational amplifier for comparison after the power-off delay relay, which avoids frequent starting and stopping of the air-cooling fan near the critical temperature value, and ensures that the air-cooling fan is stable and reliable The operation ensures the stable operation of the components in the control cabinet of the pumping unit, and provides a reliable space for increasing the working temperature of the pumping unit system.

Claims (3)

1. The automatic air-cooling control system of the pumping unit control cabinet, including a transformer module, a rectifier and voltage regulator module, a temperature control circuit, a drive circuit and an air-cooled fan. The transformer module, rectifier and regulator module, temperature control circuit, The driving circuit and the air-cooling fan are connected sequentially, and the feature is that The voltage transformation module includes a transformer T to convert the high voltage 380V alternating current into a low voltage 15V; the rectification and voltage stabilization module includes a rectifier bridge QZ, a voltage stabilizer U, an inductance coil L, a capacitor C1, a capacitor C2, a capacitor C3, Capacitor C4 and diode D1 are used to convert the 15V alternating current into a stable 12V direct current; the temperature control circuit includes an operational amplifier A, a resistor R1, a resistor R2, a resistor R3, a diode D2, a capacitor C5, and a normally open temperature detection switch KH , delay relay J and delay relay normally open contact K; the drive circuit includes a triode Q1 and a triode Q2; Wherein, the input side of the transformer T is connected to 380V AC, and the output side is respectively connected to the two input terminals of the rectifier bridge QZ; the positive output terminal of the rectifier bridge is connected to the positive power input terminal pin 1 The negative output end is grounded; the pin 2 of the regulator U is connected in series with the inductance coil L to output 12V DC voltage, the pin 3 and pin 5 are directly grounded, and the pin 4 is connected to the output side of the inductance coil L; The capacitor C1, the capacitor C2, and the capacitor C3 are connected in parallel to the two output terminals of the rectifier bridge QZ respectively; the diode D1 is connected to the input side of the inductance coil L and ground respectively; the capacitor C4 is respectively connected to the inductance coil L The input side of the operational amplifier A is connected to the ground phase; the positive input terminal 3 of the operational amplifier A is connected in series with the normally open contact K of the delay relay to the positive pole of the 12V DC voltage, and the parallel circuit of the diode D2 and the capacitor C5 is connected to the ground at the same time. Reverse input terminal 2 is connected in series with resistor R1 to the positive pole of 12V DC voltage, and output terminal 1 is connected in series with resistor R3 to the b pole of transistor Q1; the normally open temperature detection switch KH is connected in series with resistor R2 to 12V DC voltage The positive pole is connected to the ground; the delay relay J is a power-off delay relay, one end of its coil is connected between the normally open temperature detection switch KH and the resistor R2, and the other end is grounded; the c pole of the triode Q1 is connected to the triode Q2 The b pole of the transistor Q2 is connected to the b pole, the e pole is connected to the pin 3 and pin 4 of the power connector JP of the air-cooled fan, and grounded; the e pole of the triode Q2 is connected to the 12V DC positive pole, and the c pole is connected to the air-cooled fan. The pin 1 and pin 2 of the power connector JP of the fan are connected. 2. The automatic air-cooling control system for the pumping unit control cabinet according to claim 1, characterized in that the normally open temperature detection switch KH is arranged on the radiator of the thyristor of the pumping unit. 3. The automatic air-cooling control system of the pumping unit control cabinet according to claim 1, characterized in that, the triode Q1 is an NPN type triode, and the triode Q2 is a PNP type triode.

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