Control circuit for automatic control cabinet and automatic control cabinet

Abstract

The utility model provides a control circuit used for an automatic control cabinet, comprising a programmable controller used for obtaining a user request instruction from a user terminal, analyzing the user request instruction and outputting a peripheral control signal; wherein the peripheral control signal at least comprises an external equipment enable signal and an external equipment control signal; the first intermediate relay unit is electrically connected with the output end of the programmable controller and is used for transmitting an external equipment enable signal and an external equipment control signal; the alternating current contactor unit is electrically connected with the output end of the first relay unit and is used for transmitting a signal output by the first relay unit; and the driving unit is electrically connected with the output end of the alternating current contactor unit and is used for turning on or turning off the external equipment according to the external equipment enable signal and the external equipment control signal. The control circuit is applied to an automatic control cabinet so as to realize intelligent control of a clean air conditioning unit and external equipment of a hospital.

Description

Technical Field

[0001] This utility model relates to the field of automatic control cabinet technology, and in particular to a control circuit for an automatic control cabinet and an automatic control cabinet. Background Technology

[0002] Cleanroom air conditioning units are an indispensable and crucial component of medical cleanroom engineering. The quality of their operation directly impacts whether the medical clean environment meets standards and the user experience for medical staff. The control cabinet, acting as a communication and control bridge between the user terminal and the cleanroom air conditioning unit, has built-in control logic that directly influences the user terminal's control over the cleanroom air conditioning unit and external equipment. Utility Model Content

[0003] The first aspect of this utility model provides a control circuit for an automated control cabinet, comprising: a programmable controller (PLC) for acquiring user request instructions from a user terminal, parsing and analyzing the user request instructions, and outputting peripheral control signals; wherein the peripheral control signals include at least an external device enable signal and an external device control signal; a first intermediate relay unit electrically connected to the output terminal of the PLC for transmitting the external device enable signal and the external device control signal; an AC contactor unit electrically connected to the output terminal of the first intermediate relay unit for transmitting the signal output by the first intermediate relay unit; and a drive unit electrically connected to the output terminal of the AC contactor unit for turning the external device on or off according to the external device enable signal and the external device control signal.

[0004] Optionally, the circuit further includes: a second intermediate relay unit, whose input terminal is electrically connected to the output terminal of the drive unit and whose output terminal is electrically connected to the programmable controller, for outputting the feedback signal output by the drive unit to the programmable controller when the drive unit receives the external device enable signal and the external device control signal.

[0005] Optionally, the circuit further includes a thermal relay unit, which is disposed between the AC contactor unit and the drive unit. In the event of a fault overload in the drive unit, the thermal relay unit senses the current in the circuit and drives the thermal relay unit to disconnect the AC contactor unit, while simultaneously sending a fault signal to the programmable controller via an enable signal.

[0006] Optionally, the circuit further includes a circuit breaker unit electrically connected to the AC contactor unit for inputting external power to the control circuit.

[0007] Optionally, the circuit further includes a button unit electrically connected to the programmable controller, for the user to control the automatic control cabinet to start or stop working via the button unit.

[0008] Optionally, the circuit breaker unit includes: a first circuit breaker, whose three input terminals are respectively electrically connected to the three terminals of a three-phase power supply in the field; a second circuit breaker, whose three input terminals are respectively electrically connected to the three output terminals of the first circuit breaker; and a third circuit breaker, whose three input terminals are respectively electrically connected to the three output terminals of the first circuit breaker, and whose output terminal is electrically connected to an AC contactor unit.

[0009] Optionally, the AC contactor unit includes: a first AC contactor, which includes a first AC coil and a first AC contact point, one end of the first AC contact point being electrically connected to the output terminal of the second circuit breaker; the first AC coil being electrically connected to the thermal relay unit; and a second AC contactor, which includes a second AC coil and a second AC contact point, one end of the second AC contact point being electrically connected to the output terminal of the third circuit breaker; the second AC coil being electrically connected to the thermal relay unit.

[0010] Optionally, the thermal relay unit includes: a first thermal relay, which includes a first thermal relay coil, a first thermal relay contact, and a second thermal relay contact, one end of the first thermal relay coil being electrically connected to the output terminal of a first AC contact, the first thermal relay contact being electrically connected to a first intermediate relay contact, and the second thermal relay contact being electrically connected to a programmable controller; and a second thermal relay, which includes a second thermal relay coil, a third thermal relay contact, and a fourth thermal relay contact, one end of the second thermal relay coil being electrically connected to the output terminal of a second AC contact, the third thermal relay contact being electrically connected to a second intermediate relay contact, and the fourth thermal relay contact being electrically connected to a programmable controller.

[0011] Optionally, the drive unit includes: a first motor, one end of which is electrically connected to the output terminal of the first thermal relay coil, and the other end of which is grounded; and a second motor, one end of which is electrically connected to the output terminal of the second thermal relay coil, and the other end of which is grounded.

[0012] In another aspect, this utility model also provides an automated control cabinet, including a control circuit for the automated control cabinet provided in the first aspect of this utility model. The control circuit is used to acquire user request instructions from a user terminal and to complete the control of the clean air conditioning unit or external equipment according to the user request instructions.

[0013] This invention provides a control circuit and an automated control cabinet for use in automated control cabinets. The control circuit, applied to the cabinet, enables intelligent control of cleanroom air conditioning units and external equipment in hospitals, avoiding the drawbacks of manual on-site operation. Furthermore, the control circuit supports automatic disconnection of the AC contactor in the event of a drive unit failure, simultaneously sending a fault signal to the programmable controller via an enable signal. This prevents the entire circuit from malfunctioning and ensures timely access to fault information for the user, effectively guaranteeing the continuous stability of air quality in the hospital's clean areas. Attached Figure Description

[0014] Figure 1 The schematic diagram illustrates the structure of the control circuit for an automated control cabinet according to an embodiment of the present invention.

[0015] Figure 2 This schematic diagram illustrates the structure of another control circuit for an automated control cabinet provided in an embodiment of the present invention; and

[0016] Figure 3 The schematic diagram illustrates a circuit diagram of a control circuit for an automated control cabinet provided in an embodiment of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] like Figure 1 As shown, this embodiment provides a control circuit for an automated control cabinet, including a programmable controller 110, a first intermediate relay unit 120, an AC contactor unit 130, and a drive unit 140.

[0019] The programmable controller 110 is used to acquire user request commands from a user terminal, parse and analyze the user request commands, and output peripheral control signals. These peripheral control signals include at least an external device enable signal and an external device control signal.

[0020] The first intermediate relay unit 120 is electrically connected to the output terminal of the programmable controller and is used to transmit external device enable signals and external device control signals.

[0021] The AC contactor unit 130 is electrically connected to the output terminal of the first transfer relay unit 120 and is used to transmit the signal output by the first transfer relay unit 120.

[0022] The drive unit 140 is electrically connected to the output terminal of the AC contactor unit 130 and is used to turn the external device on or off according to the external device enable signal and the external device control signal.

[0023] In embodiments of this invention, the programmable controller 110 can be a programmable logic controller (PLC) used to retrieve user request commands from a user terminal. The user terminal can be a computer in a hospital department, a mobile electronic device, an information panel, etc. The user request command indicates whether to turn the motor of the cleanroom air conditioning unit on or off.

[0024] For example, the first intermediate relay unit 120 may include one or more intermediate relays KA for transmitting one or more enable signals and control signals output by the programmable controller.

[0025] For example, AC contactor unit 130 may include one or more AC contactors KM for switching on and off in AC power supply circuits, enabling remote connection and disconnection of power.

[0026] For example, the drive unit 140 may include one or more motors for turning on or off external devices according to external device enable signals and external device control signals, so as to enable external devices such as clean air conditioning units or dehumidifiers to start working or stop working according to user requests.

[0027] This utility model provides a control circuit and a control cabinet for an automated control cabinet. The control circuit is applied to the control cabinet to realize intelligent control of the clean air conditioning unit and external equipment in the hospital, avoiding the defects of manual on-site control of the clean air conditioning unit and external equipment in the machine room.

[0028] Figure 2 The schematic diagram illustrates another structural diagram of a control circuit for an automated control cabinet provided in an embodiment of the present invention.

[0029] like Figure 2 As shown, the control circuit 200 for the automatic control cabinet includes: a programmable controller 210, a first intermediate relay unit 220, an AC contactor unit 230 and a drive unit 240, a second intermediate relay unit 250, a thermal relay unit 260, a circuit breaker unit 270, and a push-button unit 280. It should be noted that... Figure 2 The programmable controller 210, the first intermediate relay unit 220, the AC contactor unit 230, and the drive unit 240 shown are... Figure 1 The programmable controller 110, the first intermediate relay unit 120, the AC contactor unit 130 and the drive unit 140 shown have the same structure and function, and will not be described again here.

[0030] The second intermediate relay unit 250 has its input terminal electrically connected to the output terminal of the drive unit 240 and its output terminal electrically connected to the programmable controller 210. It is used to output the feedback signal output by the drive unit 240 to the programmable controller 210 when the drive unit 240 receives the external device enable signal and the external device control signal.

[0031] Thermal relay unit 260 is disposed between AC contactor unit 230 and drive unit 240. In the event of a fault overload in drive unit 240, thermal relay unit 260 senses the current in the line and drives thermal relay unit 260 to disconnect AC contactor unit 230. At the same time, it sends a fault signal to programmable controller 210 through an enable signal.

[0032] Circuit breaker unit 270, which is electrically connected to AC contactor unit 230, is used to input external power supply to the control circuit.

[0033] The button unit 280 is electrically connected to the programmable controller 210 and is used by the user to control the automatic control cabinet to start or stop working.

[0034] It should be noted that the control circuit provided by this utility model includes, but is not limited to, the above-mentioned unit modules. In some other embodiments, it may also include a converter (AC / DC), a display unit for display screen control, etc.

[0035] Figure 3 The schematic diagram illustrates a circuit diagram of a control circuit for an automated control cabinet provided in an embodiment of the present invention.

[0036] In practical applications, combined with Figure 2 and Figure 3 As shown, the circuit breaker unit (including multiple circuit breakers QF) is electrically connected to the three terminals (Y, G, R) of the three-phase power supply on site to provide AC power to the circuit, as well as to balance the current and provide safety protection.

[0037] like Figure 3 As shown, the circuit breaker unit may include a first circuit breaker QF1, a second circuit breaker QF2, and a third circuit breaker QF3. The AC contactor unit may include a first AC contactor KM1 and a second AC contactor KM2. The thermal relay unit may include a first thermal relay FR1 and a first thermal relay FR2. The first intermediate relay unit may include a first intermediate relay KA1. The second intermediate relay unit may include a second intermediate relay KA2. The drive unit may include a first motor M1 and a second motor M3.

[0038] The first circuit breaker QF1 has its three input terminals electrically connected to the three terminals (Y, G, R) of the three-phase power supply on site.

[0039] The three input terminals of the second circuit breaker QF2 are electrically connected to the three output terminals of the first circuit breaker QF1, respectively.

[0040] The third circuit breaker QF3 has its three input terminals electrically connected to the three output terminals of the first circuit breaker QF1, and its output terminal electrically connected to the second AC contactor KM2.

[0041] The first AC contactor KM1 includes a first AC coil KM1-1 and a first AC contact point KM1-2. One end of the first AC contact point KM1-2 is electrically connected to the output terminal of the second circuit breaker QF2. The first AC coil KM1-1 serves as the driving component; when the coil is energized, the KM contact point closes; when the coil is de-energized, the KM contact point opens. The first AC contact point KM1-2 serves as the component that receives the driving power.

[0042] The second AC contactor KM2 includes a second AC coil KM2-1 and a second AC contact point KM2-2. One end of the second AC contact point KM2-2 is electrically connected to the output terminal of the third circuit breaker QF3. The second AC coil KM2-1 serves as the driving component; when the coil is energized, the KM contact point closes; when the coil is de-energized, the KM contact point opens. The second AC contact point KM2-2 serves as the component that carries the driving power supply.

[0043] The first intermediate relay KA1 includes a first intermediate relay coil KA1-1 and a first intermediate relay contact KA1-2. One end of the first intermediate relay contact KA1-2 is electrically connected to the input terminals of the second circuit breaker QF2 and the third circuit breaker QF3, respectively, and the other end is electrically connected to the first thermal relay contact FR1-2.

[0044] The second intermediate relay KA2 includes a second intermediate relay coil KA2-1 and a second intermediate relay contact KA2-2. One end of the second intermediate relay contact KA2-2 is electrically connected to the input terminals of the second circuit breaker QF2 and the third circuit breaker QF3, respectively, and the other end is electrically connected to the third thermal relay contact FR2-2.

[0045] The first thermal relay FR1 includes a first thermal relay coil FR1-1, a first thermal relay contact FR1-2, and a second thermal relay contact FR1-3. One end of the first thermal relay coil FR1-1 is electrically connected to the output terminal of the first AC contact KM1-2, and the other end is electrically connected to the first motor M1. One end of the first thermal relay contact FR1-2 is electrically connected to the first intermediate relay contact KA1-2, and the other end is electrically connected to the first AC coil KM1-1. The other end of the first AC coil KM1-1 is electrically connected to the neutral wire terminal in the field.

[0046] The second thermal relay FR2 includes a second thermal relay coil FR2-1, a third thermal relay contact FR2-2, and a fourth thermal relay contact FR2-3. One end of the second thermal relay coil FR2-1 is electrically connected to the output terminal of the second AC contact KM2-2, and the other end is electrically connected to the second motor M2. One end of the third thermal relay contact FR2-2 is electrically connected to the second intermediate relay contact KA2-2, and the other end is electrically connected to the second AC coil KM2-1. The other end of the second AC coil KM2-1 is electrically connected to the neutral wire terminal in the field.

[0047] The AC / DC transformer is used to convert high AC power to low DC power. Its input terminals are electrically connected to the neutral terminal of the field, the input terminal of the second circuit breaker QF2, and the input terminal of the third circuit breaker QF3, respectively. Its output terminals are electrically connected to the input terminals of the programmable logic controller (PLC).

[0048] The programmable logic controller (PLC) includes multiple input terminals I and multiple output terminals Q. The multiple input terminals I are electrically connected to ground, the first thermal relay contact FR1-3, and the fourth thermal relay contact FR2-3, respectively. The multiple output terminals Q are electrically connected to the first intermediate relay coil KA1-1 and the second intermediate relay coil KA2-1, respectively.

[0049] It should be noted that, Figure 3 The quantities of circuit breakers, AC contactors, thermal relays, intermediate relays, and motors shown are merely illustrative. In other practical applications, the quantity of these devices can be arbitrary. For example, when the number of external devices requiring electrical control is 3, 4, or other quantities, the number of motors will also be 3, 4, or other quantities, and the corresponding quantities of circuit breakers, AC contactors, thermal relays, and intermediate relays will be adjusted accordingly.

[0050] exist Figure 3 In the practical application shown, the control circuit supports two control modes, such as manual operation (the user operates the button unit on the control cabinet) and automatic operation.

[0051] During manual operation, after the circuit breaker QF closes, it supplies external power to the control circuit. The user can manually operate the button on the button unit to output a start signal (i.e., an enable signal) to the PLC. The PLC, through its own program logic calculation, outputs the enable signal to the coil of the intermediate relay KA. After the coil of the intermediate relay KA closes, it outputs the enable signal to the AC contactor KM, driving the coil of the AC contactor KM to close. After the AC contactor KM closes, it introduces external drive power to the motor M, enabling the motor M to work, thereby completing the electrical control of the clean air conditioning unit or external equipment. When the motor M experiences a fault overload, the thermal relay FR senses the current in the circuit and drives the thermal relay FR to disconnect the AC contactor KM. At the same time, it sends a fault signal to the PLC through the enable signal. The user terminal (such as a touch screen HMI) obtains the relevant data from the PLC through the Modbus protocol and displays it to the user on a screen.

[0052] During automatic operation, the user sets the equipment to be started and the running time and other relevant parameters on the HMI. The HMI then sends these settings to the PLC via the Modbus protocol. After receiving the settings, the PLC sends a feedback to the HMI via the Modbus protocol to indicate that the data has been received. The PLC then runs its internal program logic based on the settings and automatically drives the cleanroom air conditioning unit or external equipment through the enable signal, achieving the goal of automatically operating the cleanroom air conditioning unit or external equipment without manual intervention.

[0053] The advantage of this embodiment lies in the fact that the control circuit is applied to an automated control cabinet, enabling intelligent control of the hospital's cleanroom air conditioning units and external equipment through automatic operation. This avoids the drawbacks of manual on-site operation of the cleanroom air conditioning units and external equipment. Furthermore, the control circuit also supports automatic disconnection of the AC contactor in the event of a motor failure, while simultaneously sending a fault signal to the PLC via an enable signal. This prevents the entire circuit from malfunctioning and ensures timely access to fault information for the user, effectively guaranteeing the continuous stability of air quality in the hospital's clean areas.

[0054] Another aspect of this utility model provides an automatic control cabinet, including the one described in this utility model. Figures 1-3 The control circuit shown is used for the automatic control cabinet. This control circuit is used to acquire user request commands from the user terminal and to control the clean air conditioning unit or external equipment according to the user request commands.

[0055] For example, external devices can be humidifiers, dehumidifiers, electric heaters, temperature and humidity sensors, or electronic water valves.

[0056] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A control circuit for an automated control cabinet, characterized in that, include: A programmable logic controller (PLC) is used to acquire user request commands from a user terminal, parse and analyze the user request commands, and output peripheral control signals; wherein, the peripheral control signals include at least an external device enable signal and an external device control signal. The first intermediate relay unit is electrically connected to the output terminal of the programmable controller and is used to transmit the external device enable signal and the external device control signal. An AC contactor unit, electrically connected to the output terminal of the first intermediate relay unit, is used to transmit the signal output by the first intermediate relay unit; and The drive unit is electrically connected to the output terminal of the AC contactor unit and is used to turn the external device on or off according to the external device enable signal and the external device control signal.

2. The control circuit according to claim 1, characterized in that, The circuit also includes: The second intermediate relay unit has its input terminal electrically connected to the output terminal of the drive unit and its output terminal electrically connected to the programmable controller. It is used to output the feedback signal output by the drive unit to the programmable controller when the drive unit receives the external device enable signal and the external device control signal.

3. The control circuit according to claim 1, characterized in that, The circuit also includes: A thermal relay unit is disposed between the AC contactor unit and the drive unit. In the event of a fault overload in the drive unit, the thermal relay unit senses the current in the circuit and drives the thermal relay unit to disconnect the AC contactor unit. At the same time, the fault signal is sent to the programmable controller via an enable signal.

4. The control circuit according to claim 1, characterized in that, The circuit also includes: A circuit breaker unit, which is electrically connected to the AC contactor unit, is used to input external power supply to the control circuit.

5. The control circuit according to claim 1, characterized in that, The circuit also includes: A button unit, which is electrically connected to the programmable controller, is used by the user to control the automatic control cabinet to start or stop working.

6. The control circuit according to claim 4, characterized in that, The circuit breaker unit includes: The first circuit breaker has its three input terminals connected to the three terminals of the three-phase power supply on site, respectively. The second circuit breaker has three input terminals electrically connected to the three output terminals of the first circuit breaker, respectively; and The third circuit breaker has its three input terminals electrically connected to the three output terminals of the first circuit breaker, and its output terminal electrically connected to the AC contactor unit.

7. The control circuit according to claim 6, characterized in that, The AC contactor unit includes: A first AC contactor includes a first AC coil and a first AC contact point, one end of the first AC contact point being electrically connected to the output terminal of the second circuit breaker; the first AC coil is electrically connected to a thermal relay unit; and... The second AC contactor includes a second AC coil and a second AC contact point. One end of the second AC contact point is electrically connected to the output terminal of the third circuit breaker, and the second AC coil is electrically connected to the thermal relay unit.

8. The control circuit according to claim 3, characterized in that, The thermal relay unit includes: A first thermal relay includes a first thermal relay coil, a first thermal relay contact, and a second thermal relay contact. One end of the first thermal relay coil is electrically connected to the output terminal of a first AC contact. The first thermal relay contact is electrically connected to a first intermediate relay contact. The second thermal relay contact is electrically connected to the programmable controller. The second thermal relay includes a second thermal relay coil, a third thermal relay contact, and a fourth thermal relay contact. One end of the second thermal relay coil is electrically connected to the output terminal of the second AC contact. The third thermal relay contact is electrically connected to the second intermediate relay contact, and the fourth thermal relay contact is electrically connected to the programmable controller.

9. The control circuit according to claim 8, characterized in that, The driving unit includes: A first motor, one end of which is electrically connected to the output terminal of a first thermal relay coil, and the other end is grounded; and The second motor has one end electrically connected to the output terminal of the second thermal relay coil, and the other end grounded.

10. An automatic control cabinet, characterized in that, include: The control circuit according to any one of claims 1 to 9 is used to acquire user request instructions from user terminals and to control the clean air conditioning unit or external equipment according to the user request instructions.

Images