CN210246304U - A compressor protection circuit for flue gas monitoring system - Google Patents
A compressor protection circuit for flue gas monitoring system Download PDFInfo
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- CN210246304U CN210246304U CN201921331864.6U CN201921331864U CN210246304U CN 210246304 U CN210246304 U CN 210246304U CN 201921331864 U CN201921331864 U CN 201921331864U CN 210246304 U CN210246304 U CN 210246304U
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Abstract
The utility model relates to a compressor protection circuit for flue gas monitoring system relates to flue gas monitoring system equipment field, and it is including concatenating in proper order in the stop button of power, start button and last electric contactor coil, goes up electric contactor coil and has a time delay relay in parallel, goes up the parallelly connected both ends at start button of first normally open contact of electric contactor, and time delay relay's normally open contact and the second normally open contact of last electric contactor concatenate in the power supply loop of compressor, and time delay relay chooses for use last time delay relay. When the start button is pressed, the coil of the upper electric contactor and the time relay are simultaneously electrified, the normally open contact is closed to form self locking at the moment, the normally open contact is closed, the time relay is electrified for preset time, and then the normally open contact is closed, so that the compressor is electrified to work, the delay time of the time delay relay is adjusted, the delayed adjustment of the electrification of the compressor is realized, and the compressor is prevented from being frequently started and damaged.
Description
Technical Field
The utility model belongs to the technical field of the technique of flue gas monitoring system equipment and specifically relates to a compressor protection circuit for flue gas monitoring system is related to.
Background
The continuous monitoring system of fume emission is the gaseous pollutant and the particulate matter that discharge the atmospheric pollutants and carry out concentration and discharge total amount continuous monitoring and with information real-time transmission to the device of the administrative department, and entire system includes: the device comprises a probe sampling system, a sample gas pretreatment system, a calibration system, a PLC control system, a gas analyzer, a DAS system and a GPRS remote communication system. In the sample gas pretreatment system, standard gas is introduced from the pretreatment front end, and the sample gas and the standard gas enter the analyzer under the same condition through the pretreatment system, so that the system error is reduced, and a compressor is required to be matched with a condenser to dehydrate the sample gas in the process.
When the continuous monitoring system for the smoke emission is debugged, the compressor is frequently started and stopped. However, frequent start and stop may cause impact on compressor components, affect compressor usage and even damage the compressor. Therefore, the compressor needs to be protected when the system is frequently started and stopped during debugging.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compressor protection circuit for flue gas monitoring system can protect the compressor when flue gas detecting system debugs or frequently opens and stops.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
the utility model provides a compressor protection circuit for flue gas monitoring system, is including the stop button, the start button and the last electric contactor coil that connect in series in proper order in the power, goes up electric contactor coil and has parallelly connected a delay relay, goes up the first normally open contact of electric contactor and connects in parallel at the both ends of start button, and the normally open contact of delay relay and the second normally open contact of going up electric contactor connect in series in the power supply loop of compressor, and delay relay chooses for use and goes up electric delay relay.
Through adopting above technical scheme, when pressing start button, go up electric contactor coil and time relay and get electric simultaneously, the normally open contact closure forms the auto-lock this moment, and normally open contact is closed, and time relay gets electric after predetermineeing the time, and normally open contact is closed to make the compressor get electric work. Due to the fact that the delay relay is added, delay adjustment of electrification of the compressor can be achieved by adjusting delay time of the delay relay, and therefore the compressor is prevented from being damaged due to frequent starting.
The utility model discloses further set up to: the compressor is provided with a temperature detection system, the temperature detection system comprises a temperature sensor, a signal comparison module and an alarm driving module, and the temperature sensor is used for detecting the temperature of a motor of the compressor and outputting a temperature detection signal; the signal comparison module is used for receiving the temperature detection signal and outputting a judgment signal when the temperature detection value is greater than a temperature set value; the alarm driving module is used for receiving the judgment signal and giving an alarm when receiving the judgment signal.
Through adopting above technical scheme, temperature sensor detects the motor temperature of compressor under operating condition to send out the warning when motor temperature detected value is greater than the temperature set value, the suggestion staff in time takes measures, perhaps drives compressor emergency braking, further protects the compressor, prevents that the motor temperature of compressor from too high damaging the compressor.
The utility model discloses further set up to: the temperature sensor is set as a thermocouple.
Through adopting above technical scheme, detect the motor temperature of compressor, and because the thermocouple detects the precision height, measuring range is big, but remote transmission, and simple structure, with low costs, it is more convenient to use.
The utility model discloses further set up to: the signal comparison module comprises a first signal comparison module and a second signal comparison module;
the first signal comparison module comprises a first set value circuit and a first comparator, the first set value circuit is used for setting a first temperature set value and outputting a first temperature set value signal, the in-phase input end of the first comparator is connected with the output end of the temperature sensor and used for receiving a temperature detection signal, the reverse phase input end of the first comparator is connected with the output end of the first set value circuit and used for receiving the first temperature set value signal, and when a temperature detection value is larger than the first temperature set value, a first judgment signal is output;
the second signal comparison module comprises a second set value circuit and a second comparator, the second set value circuit is used for setting a second temperature set value and outputting a second temperature set value signal, the second temperature set value is greater than the first temperature set value, the non-inverting input end of the second comparator is connected with the output end of the temperature sensor and is used for receiving a temperature detection signal, the inverting input end of the second comparator is connected with the output end of the second temperature set value circuit and is used for receiving the second temperature set value signal, and when the temperature detection value is greater than the second temperature set value, a second judgment signal is output;
and the alarm driving module sends an alarm when receiving the first judgment signal and brakes the compressor when receiving the second judgment signal.
By adopting the technical scheme, a first temperature value and a second temperature set value are respectively set, the temperature detection signal is respectively compared with the first temperature set value and the second temperature set value, when the temperature detection value is greater than the first temperature set value, a first judgment signal is output, and an alarm driving module sends out an alarm when receiving the first judgment signal; and when the temperature detection value is greater than the second temperature set value, outputting a second judgment signal and braking the compressor when the alarm driving module receives the second judgment signal.
The utility model discloses further set up to: the alarm driving module comprises an alarm module and an emergency braking module, and the alarm module is connected with the first signal comparison module and used for receiving the first judgment signal and giving an alarm after receiving the first judgment signal; and the emergency braking module is connected with the second signal comparison module and is used for receiving the second judgment signal and driving the compressor to perform emergency braking after receiving the second judgment signal.
By adopting the technical scheme, when the alarm driving module receives the first judgment signal, the alarm driving module sends out an alarm; and braking the compressor when the alarm driving module receives the second judgment signal.
The utility model discloses further set up to: the alarm module comprises a first triode and a buzzer, the base electrode of the first triode is connected with the output end of the first comparator, and the emitting electrode of the first triode is connected with the buzzer.
Through adopting above technical scheme, when first comparator output first judgement signal to alarm module, first triode switches on, and the buzzer sends out the warning, and the suggestion staff in time takes measures.
The utility model discloses further set up to: the emergency braking module comprises a second triode and a protection contactor, the base of the second triode is connected with the output end of the second comparator, the emitting electrode of the second triode is connected with the coil of the protection contactor, and the first normally closed contact and the second normally closed contact of the protection contactor are respectively connected with the stop button and the second normally open contact of the power-on contactor in series.
Through adopting above technical scheme, when the second comparator output second judgement signal to emergency braking module, the second triode switches on, and the protection contactor coil is electrified, and the first normally closed contact and the second normally closed contact disconnection of protection contactor, compressor emergency braking further protect the compressor.
The utility model discloses further set up to: and the protective contactor coil is connected with an energy storage capacitor in parallel.
Through adopting above technical scheme, in the test process, because the task reason, probably the staff can restart the compressor in the short time after the compressor overheated closes, the setting of energy storage electric capacity can still keep the protection contactor coil to be electrified in the certain time after the temperature drops to below the second temperature setting value to prevent the repeated start under the overheated situation.
To sum up, the utility model discloses a beneficial technological effect does:
1. by arranging the first control circuit and the second control circuit, when the refrigeration equipment is debugged and frequently started and stopped, the compressor is always in a running state, so that the compressor is prevented from being damaged by frequent switching on and off;
2. the compressor is provided with a temperature detection system, and when the temperature of the motor is higher than a set value, an alarm signal is sent or the compressor is driven to perform emergency braking, so that the compressor is further protected, and the compressor is prevented from being damaged due to overhigh temperature of the motor of the compressor.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic circuit diagram of the temperature sensing system.
In the figure: 1. a signal comparison module; 11. a first signal comparison module; 12. a second signal comparison module; 111. a first set point circuit; 121. a second set point circuit; 2. an alarm driving module; 21. a buzzer alarm module; 22. an emergency braking module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, for the utility model discloses a compressor protection circuit for flue gas monitoring system, including in proper order series connection in the stop button SB of power, start button S and last electric contactor coil KM1, go up electric contactor coil KM1 parallel connection and have a time delay relay KT, go up the both ends of electric contactor' S normally open contact KT-1 parallelly connected at start button S, the normally open contact KT-1 of time delay relay KT and the normally open contact KM1-1 of last electric contactor concatenate in the power supply loop of compressor, time delay relay KT chooses for use to go up electric delay relay KT. When a starting button S is pressed, the coil KM1 of the upper electric contactor and the time relay KT are simultaneously electrified, the normally open contact KM-1 is closed to form self locking, the normally open contact KM1-2 is closed, and after the time relay KT is electrified for a preset time, the normally open contact KT-1 is closed, so that the compressor is electrified to work. Because the delay relay KT is added, the delay time of the power-on of the compressor can be adjusted by adjusting the delay time of the delay relay KT, so that the compressor is prevented from being damaged due to frequent starting.
Specifically, be provided with temperature-detecting system on the compressor, temperature-detecting system includes: the detection end of the thermocouple is attached to the shell of the compressor and used for detecting the temperature of a motor of the compressor and outputting a temperature detection module; the signal comparison module 1 is used for receiving a temperature detection signal and outputting a judgment signal when the temperature detection value is greater than a temperature set value; the alarm driving module 2 is used for receiving the judgment signal and sending an alarm to prompt a worker to take measures in time or drive the compressor to brake emergently, so that the compressor is further protected, and the compressor is prevented from being damaged due to overhigh temperature of a motor of the compressor.
The signal comparison module 1 comprises a first signal comparison module 11 and a second signal comparison module 12, the first signal comparison module 11 comprises a first set point circuit 111 and a comparator D1, the non-inverting input end of the comparator D1 is connected with the output end of the thermocouple, the inverting input end of the comparator D1 is connected with the output end of the first set point circuit 111, the first set point circuit 111 comprises a fixed resistor R4 and a fixed resistor R5 which are connected in series, and the node where the fixed resistor R4 and the fixed resistor R5 are coupled is connected with the inverting input end of the comparator D1; the second signal comparison module 12 includes a second setpoint circuit 121 and a comparator D2, a non-inverting input of the comparator D2 is connected to the output of the thermocouple, an inverting input of the comparator D2 is connected to the output of the second temperature setpoint circuit, the second setpoint circuit 121 includes a fixed resistor R6 and a fixed resistor R7 connected in series, and a node at which the fixed resistor R6 and the fixed resistor R7 are coupled is connected to an inverting input of the comparator D2. The first setting circuit 111 is used for setting a first temperature setting value and outputting a first temperature setting value signal, the second setting circuit 121 is used for setting a second temperature setting value and outputting a second temperature setting value signal, the second temperature setting value is greater than the first temperature setting value, and when the temperature detection value is greater than the first temperature setting value, the comparator D1 outputs a first judgment signal; when the temperature detection value is greater than the second temperature set value, the comparator D2 outputs a second determination signal.
The alarm driver module 2 comprises an alarm module 21 and an emergency brake module 22. The alarm module 21 comprises a triode Q1 and a buzzer BUZZ, the base of the triode Q1 is connected with the output end of a comparator D1, and the emitter of the triode Q1 is grounded through the buzzer BUZZ. The emergency braking module 22 comprises a triode Q2 and a protection contactor coil KM2, wherein the base electrode of the triode Q2 is connected with the output end of a comparator D2, and the emitter electrode of the triode Q2 is grounded through a protection contactor coil KM 2. The normally closed contact KM2-1 of the protection contactor is connected in series in a power supply loop of the compressor, and the normally closed contact KM2-2 of the protection contactor is connected in series with the stop button SB. When the comparator D1 outputs a first judgment signal to the alarm module, the triode Q1 is conducted, the buzzer gives an alarm, and the staff is prompted to take measures in time; when the comparator D2 outputs a second judgment signal to the emergency braking module 22, the triode Q2 is conducted, the coil KM2 of the protection contactor is electrified, the normally closed contact KM2-1 and the normally closed contact KM2-2 of the protection contactor are disconnected, and the compressor is braked emergently to further protect the compressor.
Further, the protective relay coil KM2 is also connected in parallel with three energy storage capacitors C1, C2 and C3. During the testing process, due to task reasons, it is possible that a worker may restart the compressor within a short time after the compressor is turned off due to overheating, and the energy storage capacitor may be set to keep the protection contactor coil KM2 energized for a certain time after the temperature drops below the second temperature setting value, thereby preventing repeated starting under the overheating condition.
According to the above contents, when the smoke monitoring system is debugged, the starting button S is pressed, the time delay relay KT starts time delay, after the time delay is finished, the coil KM1 of the power-on contactor is electrified, and the compressor starts to work. The compressor is started in a delayed mode when the flue gas monitoring system is debugged in the whole process, frequent starting and stopping of the compressor are avoided, the compressor is protected, and the compressor is prevented from being damaged due to frequent starting and stopping. The compressor is provided with a temperature detection system, the thermocouple detects the temperature of a motor of the compressor and outputs a temperature detection signal to the signal comparison module 1, when the temperature detection value is greater than a first temperature set value, the comparator D1 outputs a first judgment signal to the alarm module, the triode Q1 is conducted, and the buzzer starts to give an alarm; when the temperature detection value is larger than the second temperature set value, the comparator D2 outputs a second judgment signal, the triode Q2 is conducted, the protection contactor is electrified, the normally closed contact KM2-1 and the normally closed contact KM2-2 of the protection contactor are disconnected, the compressor is emergently braked, the compressor is further protected, and the compressor is prevented from being damaged due to overhigh temperature of a motor of the compressor.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. The utility model provides a compressor protection circuit for flue gas monitoring system, is including the stop button, the start button and the last electric contactor coil that connect in series in proper order in the power, goes up electric contactor coil and has parallelly connected a delay relay, goes up the first normally open contact of electric contactor and connects in parallel at the both ends of start button, and the normally open contact of delay relay and the second normally open contact of going up electric contactor connect in series in the power supply loop of compressor, and delay relay chooses for use and goes up electric delay relay.
2. The compressor protection circuit for a flue gas monitoring system of claim 1, wherein: the compressor is provided with a temperature detection system, the temperature detection system comprises a temperature sensor, a signal comparison module (1) and an alarm driving module (2), and the temperature sensor is used for detecting the motor temperature of the compressor and outputting a temperature detection signal; the signal comparison module (1) is used for receiving the temperature detection signal and outputting a judgment signal when the temperature detection value is greater than a temperature set value; the alarm driving module (2) is used for receiving the judgment signal and giving an alarm when receiving the judgment signal.
3. The compressor protection circuit for a flue gas monitoring system of claim 2, wherein: the temperature sensor is set as a thermocouple.
4. The compressor protection circuit for a flue gas monitoring system of claim 2, wherein: the signal comparison module (1) comprises a first signal comparison module (11) and a second signal comparison module (12);
the first signal comparison module (11) comprises a first set value circuit (111) and a first comparator, wherein the first set value circuit (111) is used for setting a first temperature set value and outputting a first temperature set value signal, the in-phase input end of the first comparator is connected with the output end of the temperature sensor and is used for receiving a temperature detection signal, the reverse-phase input end of the first comparator is connected with the output end of the first set value circuit (111) and is used for receiving the first temperature set value signal, and when the temperature detection value is larger than the first temperature set value, a first judgment signal is output;
the second signal comparison module (12) comprises a second set value circuit (121) and a second comparator, wherein the second set value circuit (121) is used for setting a second temperature set value and outputting a second temperature set value signal, the second temperature set value is greater than the first temperature set value, the non-inverting input end of the second comparator is connected with the output end of the temperature sensor and is used for receiving a temperature detection signal, the inverting input end of the second comparator is connected with the output end of the second temperature set value circuit and is used for receiving the second temperature set value signal, and when the temperature detection value is greater than the second temperature set value, a second judgment signal is output;
and the alarm driving module sends an alarm when receiving the first judgment signal and brakes the compressor when receiving the second judgment signal.
5. The compressor protection circuit for a flue gas monitoring system of claim 4, wherein: the alarm driving module (2) comprises an alarm module and an emergency braking module (22), and the alarm module is connected with the first signal comparison module (11) and used for receiving the first judgment signal and giving an alarm after receiving the first judgment signal; and the emergency braking module (22) is connected with the second signal comparison module (12) and is used for receiving the second judgment signal and driving the compressor to perform emergency braking after receiving the second judgment signal.
6. The compressor protection circuit for a flue gas monitoring system of claim 5, wherein: the alarm module comprises a first triode and a buzzer, the base electrode of the first triode is connected with the output end of the first comparator, and the emitting electrode of the first triode is connected with the buzzer.
7. The compressor protection circuit for a flue gas monitoring system of claim 6, wherein: the emergency braking module (22) comprises a second triode and a protection contactor, the base of the second triode is connected with the output end of the second comparator, the emitting electrode of the second triode is connected with the coil of the protection contactor, and the first normally closed contact and the second normally closed contact of the protection contactor are respectively connected with the stop button and the second normally open contact of the power-on contactor in series.
8. The compressor protection circuit for a flue gas monitoring system of claim 7, wherein: and the protective contactor coil is connected with an energy storage capacitor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921331864.6U CN210246304U (en) | 2019-08-15 | 2019-08-15 | A compressor protection circuit for flue gas monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921331864.6U CN210246304U (en) | 2019-08-15 | 2019-08-15 | A compressor protection circuit for flue gas monitoring system |
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| Publication Number | Publication Date |
|---|---|
| CN210246304U true CN210246304U (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921331864.6U Active CN210246304U (en) | 2019-08-15 | 2019-08-15 | A compressor protection circuit for flue gas monitoring system |
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|---|---|
| CN (1) | CN210246304U (en) |
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2019
- 2019-08-15 CN CN201921331864.6U patent/CN210246304U/en active Active
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