Control system of air compressor dryer

Abstract

The utility model relates to the technical field of control circuits, in particular to a control system of an air compressor drying machine, which comprises an air compressor and a drying machine which are both connected with a control circuit, the control circuit comprises a relay K1, an output end of the relay K1 is connected with a switch S1, and the other end of the switch S1 is connected with a switching value input module. An output end of the switching value input module is connected with an input port of the PLC, an output port of the PLC is connected with a switching value output module, a relay K2 is connected in series between the output port of the PLC and the switching value output module, the other end of the relay K2 is connected with a switch S2, and the other end of the switch S2 is connected with an alarm indicator lamp HL; the input port of the PLC is also connected with a four-channel analog quantity input module, and the four-channel analog quantity input module and the sensor are connected in parallel with a surge protector. And by arranging the surge protector, the risk of equipment damage caused by overvoltage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, in particular to a control system for an air compressor dryer. Background Art

[0002] Air compressor and dryer control systems are an integral part of modern industrial production, particularly in manufacturing, food processing, chemical engineering, healthcare, and other fields. Their primary function is to provide compressed air for various process flows, and the quality of compressed air directly impacts the quality of the final product and the lifespan of the equipment.

[0003] The lack of resistance to external factors such as power fluctuations and lightning can easily lead to frequent equipment failures or damage. In view of this, a control system for the air compressor dryer is provided. Utility Model Content

[0004] The main purpose of the utility model is to provide a control system for an air compressor dryer to solve the problem in the related art that external factors such as power fluctuations and lightning easily lead to frequent failures or damages of the equipment.

[0005] To achieve the above-mentioned object, according to one aspect of the present invention, a control system for an air compressor and a dryer is provided, comprising an air compressor and a dryer both connected to a control circuit, the control circuit comprising a relay K1, an output end of the relay K1 being connected to a switch S1, the other end of the switch S1 being connected to a switching input module, an output end of the switching input module being connected to an input port of a PLC, an output port of the PLC being connected to a switching output module, a relay K2 being connected in series between the PLC output port and the switching output module, the other end of the relay K2 being connected to a switch S2, and the other end of the switch S2 being connected to an alarm indicator light HL;

[0006] The input port of the PLC is also connected to a 4-channel analog input module, which is used to collect analog signals from sensors and convert the analog signals into digital signals. A surge protector is connected in parallel between the 4-channel analog input module and the sensor.

[0007] 4-channel analog input modules are typically connected to various sensors, including pressure transmitters, dew point temperature sensors, temperature transmitters, and flow sensors. These sensors convert physical parameters into analog electrical signals, which are then transmitted to the PLC through the 4-channel analog input module. The PLC uses these digital signals to monitor the operating status of the air compressor and dryer, such as whether the current pressure, dew point temperature, temperature, and flow rate are within the permitted range. Based on the received data, the PLC adjusts the operating status of the air compressor and dryer to maintain optimal operating conditions. For example, if the pressure is too high or too low, the PLC can send instructions to the relay via the digital output module (DO) to adjust the operating speed of the air compressor or activate backup equipment to maintain stable air pressure. Similarly, if the temperature or humidity exceeds the set range, the PLC can also take appropriate measures, such as activating the cooling system or dehumidification device.

[0008] Furthermore, the positive output of the sensor is connected to the input port of the surge protector;

[0009] The input port of the surge protector is connected to the positive input port of the 4-channel analog input module;

[0010] The negative output of the sensor is connected to the output port of the surge protector;

[0011] The output port of the surge protector is connected to the common port of the 4-channel analog input module.

[0012] Specifically, port 14 of the surge protector is connected to the positive pole of the power supply;

[0013] Connect port 13 of the surge protector to the negative terminal of the power supply.

[0014] Furthermore, the normally open contact of the surge protector is connected to a 4-channel analog input module.

[0015] Furthermore, the air compressor is connected to the normally open contact of the relay K1;

[0016] The dryer is connected to the normally closed contact of relay K1.

[0017] Furthermore, the switching output module is connected to the normally open contact of the relay K2.

[0018] Furthermore, the input signals of the switch input module include at least an air compressor comprehensive alarm feedback signal, an air compressor shutdown alarm feedback signal, an air compressor operation signal feedback signal, an air compressor loading and unloading signal feedback signal, an air compressor local / remote signal, a dryer operation signal feedback signal, a dryer fault alarm feedback signal, a dryer pressure equalizing feedback signal, an air compressor start signal, an air compressor stop signal, a dryer start signal, a dryer stop signal, a power supply 24VDC+ signal, a power supply 24VDC- signal, a central control start signal, a central control stop signal, a central control emergency stop signal, an emergency stop signal, a 1# switching power supply alarm signal, a 2# switching power supply alarm signal, a PLC power module alarm signal, an interlock start signal, an interlock stop signal, an independent / interlock signal, and a local / remote signal; the switch input module is responsible for collecting various status signals from the equipment and converting them into digital signals that can be recognized by the PLC. The switch input module is preferably a 32-point switch input module with model BMX DDI 3202K;

[0019] The output signals of the switch output module include at least an air compressor start signal, an air compressor stop signal, a dryer stop signal, an electromagnetic drain valve control signal, a power supply 24VDC+ signal and a power supply 24VDC- signal.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The air compressor dryer's control system uses a 32-point digital input module to collect digital signals from field devices, such as status signals from buttons, limit switches, and proximity switches. The discrete signals provided by the field devices are converted into digital signals that can be processed within the PLC. A surge protector is also installed to reduce the risk of equipment damage due to overvoltage. The surge protector can absorb or transfer instantaneous overvoltage caused by lightning strikes or other reasons, protecting the connected digital input module from damage, thereby indirectly extending the service life of the digital input module and other related electronic equipment.

[0022] 2. In the control system of the air compressor dryer, at the same time, through the 4-channel analog input module, data from multiple sensors (such as pressure transmitters, dew point temperature sensors, etc.) can be obtained in real time, enabling the system to accurately monitor the operating status of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall circuit connection of the control circuit in the preferred embodiment of the present utility model;

[0024] Figure 2 This is an electrical schematic diagram of the input circuit of the air compressor dryer in the preferred embodiment of the utility model;

[0025] Figure 3This is one of the electrical schematic diagrams of the switch input module in the preferred embodiment of the present utility model;

[0026] Figure 4 This is the second electrical schematic diagram of the switch input module in the preferred embodiment of the present utility model;

[0027] Figure 5 This is the third electrical schematic diagram of the switch input module in the preferred embodiment of the present utility model;

[0028] Figure 6 This is the fourth electrical schematic diagram of the switch input module in the preferred embodiment of the present utility model;

[0029] Figure 7 This is one of the electrical schematic diagrams of the switch output module in the preferred embodiment of the present utility model;

[0030] Figure 8 This is the second electrical schematic diagram of the switch output module in the preferred embodiment of the present utility model;

[0031] Figure 9 This is the third electrical schematic diagram of the switch output module in the preferred embodiment of the present utility model;

[0032] Figure 10 This is the fourth electrical schematic diagram of the switch output module in the preferred embodiment of the present utility model;

[0033] Figure 11 This is one of the electrical schematic diagrams of a 4-channel analog input module in a preferred embodiment of the present utility model;

[0034] Figure 12 This is the second electrical schematic diagram of the 4-channel analog input module in the preferred embodiment of the present utility model;

[0035] Figure 13 This is the third electrical schematic diagram of the 4-channel analog input module in the preferred embodiment of the present utility model;

[0036] Figure 14 This is the electrical schematic diagram of the panel indicator light of the air compressor in the preferred embodiment of the utility model;

[0037] Figure 15 This is an electrical schematic diagram of the panel indicator light of the dryer in the preferred embodiment of the present utility model. DETAILED DESCRIPTION

[0038] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments. Example

[0039] See also Figures 1-15 As shown, the purpose of this embodiment is to provide a control system for an air compressor and a dryer, including an air compressor and a dryer both connected to a control circuit, the control circuit including a relay K1, an output end of the relay K1 connected to a switch S1, the other end of the switch S1 connected to a switch input module, an output end of the switch input module connected to an input port of a PLC, an output port of the PLC connected to a switch output module, a relay K2 connected in series between the PLC output port and the switch output module, the other end of the relay K2 connected to a switch S2, and the other end of the switch S2 connected to an alarm indicator light HL;

[0040] The switch input module can receive up to 32 discrete signals, which means it can monitor various states of the air compressor and dryer, such as start signals, stop signals, alarm signals, etc. This enables the system to fully understand the working status of the equipment and respond in a timely manner;

[0041] The 32-point switch output module can output up to 32 control signals for controlling the start, stop, and other related operations of the equipment. This high-density output capability enables the system to fine-tune the working status of the equipment and achieve precise control.

[0042] The 4-channel analog input module is used to collect analog signals from sensors and convert them into digital signals for PLC processing. This enables the system to monitor key parameters such as pressure, temperature, flow, etc. in real time to ensure the compressed air quality and equipment operation are in optimal condition.

[0043] At the same time, the output end of the switch output module is directly connected to the device to be controlled (i.e., the air compressor and dryer). When the PLC controls a device according to the signal of the switch input module (such as starting or stopping the air compressor), the PLC sends a signal to the switch output module. This signal will change the state of the switch output module, thereby affecting the negative device connected to the module (air compressor and dryer).

[0044] The input port of the PLC is also connected to a 4-channel analog input module, which is used to collect analog signals from sensors and convert the analog signals into digital signals. A surge protector is connected in parallel between the 4-channel analog input module and the sensor.

[0045] 4-channel analog input modules are typically connected to various sensors, including pressure transmitters, dew point temperature sensors, temperature transmitters, and flow sensors. These sensors convert physical parameters into analog electrical signals, which are then transmitted to the PLC through the 4-channel analog input module. The PLC uses these digital signals to monitor the operating status of the air compressor and dryer, such as whether the current pressure, dew point temperature, temperature, and flow rate are within the permitted range. Based on the received data, the PLC adjusts the operating status of the air compressor and dryer to maintain optimal operating conditions. For example, if the pressure is too high or too low, the PLC can send instructions to the relay via the digital output module (DO) to adjust the operating speed of the air compressor or activate backup equipment to maintain stable air pressure. Similarly, if the temperature or humidity exceeds the set range, the PLC can also take appropriate measures, such as activating the cooling system or dehumidification device.

[0046] The positive output of the sensor is connected to the input port (port 12) of the surge protector;

[0047] Connect the input port (port 12) of the surge protector to the positive input port (+IV0) of the 4-channel analog input module.

[0048] The negative output of the sensor is connected to the output port of the surge protector (port 11);

[0049] The output port (port 11) of the surge protector is connected to the common port (COM0) of the 4-channel analog input module.

[0050] Specifically, port 14 of the surge protector is connected to the positive pole of the power supply (DC24V-12);

[0051] Connect port 13 of the surge protector to the negative pole (0V) of the power supply.

[0052] In this embodiment, specifically, the electrical principle of the surge protector and the 4-channel analog input module is as follows: Figure 11-13 As shown;

[0053] Wherein, the normally open contact of the surge protector is connected to the 4-channel analog input module.

[0054] In this embodiment, if Figure 2 As shown, the air compressor is connected to the normally open contact of relay K1;

[0055] The dryer is connected to the normally closed contact of relay K1.

[0056] The input signals of the switch input module include at least an air compressor comprehensive alarm feedback signal, an air compressor shutdown alarm feedback signal, an air compressor operation signal feedback signal, an air compressor loading and unloading signal feedback signal, an air compressor local / remote signal, a dryer operation signal feedback signal, a dryer fault alarm feedback signal, a dryer pressure equalizing feedback signal, an air compressor start signal, an air compressor stop signal, a dryer start signal, a dryer stop signal, a power supply 24VDC+ signal, a power supply 24VDC- signal, a central control start signal, a central control stop signal, a central control emergency stop signal, an emergency stop signal, a 1# switching power supply alarm signal, a 2# switching power supply alarm signal, a PLC power module alarm signal, an interlock start signal, an interlock stop signal, an independent / interlock signal, and a local / remote signal;

[0057] In this embodiment, the switch input module is responsible for collecting the above-mentioned status signals from the equipment (air compressor and dryer) and converting them into digital signals that can be recognized by the PLC. The switch input module is preferably a 32-point switch input module of model BMX DDI3202K;

[0058] Specifically, there are at least three air compressors, namely air compressor A, air compressor B and air compressor C;

[0059] There are at least three dryers, namely dryer A, dryer B and dryer C;

[0060] The specific electrical connection diagram of the air compressor, dryer and switch input module is as follows: Figure 3-6 As shown;

[0061] Furthermore, the output signals of the switch output module include at least an air compressor start signal, an air compressor stop signal, a dryer stop signal, an electromagnetic drain valve control signal, a power supply 24VDC+ signal and a power supply 24VDC- signal.

[0062] The switch output module is preferably a 32-point switch output module of model BMX DDO 3202K, which is connected to the normally open contact of relay K2. The specific electrical connection schematic diagram of the switch output module is as follows: Figure 7-10 shown.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. The control system of the air compressor and dryer, the air compressor and dryer are connected to a control circuit, which is characterized in that: The control circuit includes a relay K1, the output end of the relay K1 is connected to a switch S1, the other end of the switch S1 is connected to a switch input module, the output end of the switch input module is connected to the input port of the PLC, the output port of the PLC is connected to the switch output module, a relay K2 is connected in series between the PLC output port and the switch output module, the other end of the relay K2 is connected to a switch S2, and the other end of the switch S2 is connected to an alarm indicator light HL; The input port of the PLC is also connected to a 4-channel analog input module, which is used to collect analog signals from sensors and convert the analog signals into digital signals. A surge protector is connected in parallel between the 4-channel analog input module and the sensor.

2. The control system of the air compressor dryer according to claim 1, characterized in that: The positive output of the sensor is connected to the input port of the surge protector; The input port of the surge protector is connected to the positive input port of the 4-channel analog input module; The negative output of the sensor is connected to the output port of the surge protector; The output port of the surge protector is connected to the common port of the 4-channel analog input module.

3. The control system of the air compressor dryer according to claim 2, characterized in that: The normally open contact of the surge protector is connected to a 4-channel analog input module.

4. The control system of the air compressor dryer according to claim 1, characterized in that: The air compressor is connected to the normally open contact of relay K1; The dryer is connected to the normally closed contact of relay K1.

5. The control system of the air compressor dryer according to claim 1, characterized in that: The switching output module is connected to the normally open contact of the relay K2.

6. The control system of the air compressor dryer according to claim 1, characterized in that: The input signals of the switch input module include at least an air compressor comprehensive alarm feedback signal, an air compressor shutdown alarm feedback signal, an air compressor operation signal feedback signal, an air compressor loading and unloading signal feedback signal, an air compressor local / remote signal, a dryer operation signal feedback signal, a dryer fault alarm feedback signal, a dryer pressure equalizing feedback signal, an air compressor start signal, an air compressor stop signal, a dryer start signal, a dryer stop signal, a power supply 24VDC+ signal, a power supply 24VDC- signal, a central control start signal, a central control stop signal, a central control emergency stop signal, an emergency stop signal, a 1# switching power supply alarm signal, a 2# switching power supply alarm signal, a PLC power module alarm signal, an interlock start signal, an interlock stop signal, an independent / interlock signal, and a local / remote signal; The output signals of the switch output module include at least an air compressor start signal, an air compressor stop signal, a dryer stop signal, an electromagnetic drain valve control signal, a power supply 24VDC+ signal and a power supply 24VDC- signal.

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