High-reliability measurement and control system of B777 heat exchanger testboard

Abstract

The utility model belongs to the technical field of heat exchanger testing, and particularly relates to a high-reliability measurement and control system of a B777 heat exchanger testboard. Comprising an industrial personal computer which is connected with a heat exchanger, and further comprises a data acquisition unit and a control protection unit, the data acquisition unit is used for acquiring working condition data of the heat exchanger; and the control protection unit is used for receiving the working condition data and adjusting the air flow of the heat exchanger according to the working condition data. The corresponding protection pressure relief pressure can be set according to the maximum working pressure of the heat exchanger, differential protection of the testboard on the heat exchanger can be achieved, operation is safe, and it can be guaranteed that the testboard cannot be out of control and damage the heat exchanger due to operating system faults or test software collapse.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchanger testing, and in particular relates to a high-reliability measurement and control system for a B777 heat exchanger test bench. Background Art

[0002] During the test process of the existing B777 heat exchanger test bench measurement and control system, the test system mainly relies on the CPU computing power of the industrial control computer, and expands the digital I / O card, analog acquisition card and analog output control card through the PCI expansion slot of the computer motherboard to realize the electric control valve control and sensor signal acquisition of the pneumatic system of the test bench. However, during the operation of the B777 heat exchanger test bench system, the gas supply flow rate or the switch valve cannot be adjusted due to operating system or software failure. The inlet air pressure of the B777 heat exchanger is greater than the maximum operating air pressure, which may cause the heat exchanger to explode and be damaged due to overpressure.

[0003] In the prior art, the B777 heat exchanger test bench control system is based on the architecture. Since the calculations during the operation of the internal test system are all dependent on the hardware and software of the industrial control computer, the industrial control computer can use high-configuration hardware and stable operating system and software to ensure the stable operation of the test bench. However, in actual use, due to system upgrades and memory usage issues, when the control computer crashes or suddenly fails, the closed-loop control of the inlet flow, the switch control of the air supply electric ball valve, and the overpressure protection logic corresponding to each part number involved in the control software will fail. In this way, the air supply cannot be remotely disconnected through the control computer after a failure occurs during the test, and the heat exchanger may even be damaged due to overshoot of the inlet pressure control. Utility Model Content

[0004] In view of the above problems, the present invention provides a high reliability measurement and control system for a B777 heat exchanger test bench, comprising an industrial computer connected to a heat exchanger.

[0005] The system also includes a data acquisition unit and a control and protection unit;

[0006] The data acquisition unit is used to collect the operating data of the heat exchanger;

[0007] The control and protection unit is used to receive the operating condition data and adjust the air flow of the heat exchanger according to the operating condition data.

[0008] Preferably, the control and protection unit includes an analog input module, an analog output module and a digital input / output module.

[0009] Preferably, the operating condition data includes pressure data and flow data;

[0010] The data acquisition unit includes a pressure sensor and a flow sensor, and both the pressure sensor and the flow sensor are connected to the control and protection unit.

[0011] Preferably, the data acquisition unit further comprises a one-input and two-output power distribution type isolator, the input end of the one-input and two-output power distribution type isolator is connected to the pressure sensor and the flow sensor;

[0012] The first output end of the one-input and two-output power distribution type isolator is connected to the control and protection unit.

[0013] Preferably, the system further comprises a high-precision acquisition unit, which is connected to the heat exchanger via a TCP communication circuit, and the second output end of the one-input and two-output power distribution isolator is connected to the high-precision acquisition unit.

[0014] Preferably, the system further comprises a temperature control unit, the temperature control unit comprises an air heater, and the air heater is connected to the industrial computer.

[0015] Preferably, the system further comprises a temperature sensor, and the temperature sensor is connected to the analog input module.

[0016] Preferably, the system further comprises a display, and the display is connected to the industrial computer.

[0017] The present disclosure has the following beneficial effects:

[0018] The present invention can set the corresponding protective relief pressure according to the maximum working pressure of the heat exchanger, which can not only realize the differential protection of the heat exchanger by the test bench and ensure safe operation, but also ensure that the test bench will not lose control and damage the heat exchanger due to operating system failure or test software crash.

[0019] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 The principle block diagram of the measurement and control system in the embodiment of the present disclosure is shown;

[0022] Figure 2 The pneumatic principle diagram of the test system in the embodiment of the present disclosure is shown;

[0023] Figure 3 The appearance of the measurement and control cabinet in the embodiment of the present disclosure is shown;

[0024] Figure 4 A three-dimensional diagram of a B777 heat exchanger in an embodiment of the present disclosure is shown;

[0025] Figure 5 A schematic diagram of a pressure sensor acquisition circuit in an embodiment of the present disclosure is shown;

[0026] Figure 6 A panel diagram of a heater control cabinet in an embodiment of the present disclosure is shown;

[0027] Figure 7 A schematic diagram of a heater control circuit in an embodiment of the present disclosure is shown;

[0028] In the figure: 1. Orifice flowmeter; 2. Pilot pressure reducing valve; 3. Gas pipeline heater. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as being limited to the examples set forth herein; on the contrary, these embodiments are provided so that the present disclosure will be more comprehensive and complete, and the concepts of the example embodiments are fully conveyed to those skilled in the art. The described features, structures, or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known technical solutions are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0030] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware units or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0031] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the steps. For example, some steps may be decomposed, while some steps may be combined or partially combined, so the actual execution order may change according to the actual situation.

[0032] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0033] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or sub-modules is not necessarily limited to those steps or sub-modules explicitly listed, but may include other steps or sub-modules not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0034] like Figure 1 As shown, the present disclosure proposes a high reliability measurement and control system for a B777 heat exchanger test bench, comprising an industrial computer connected to the heat exchanger.

[0035] The system also includes a data acquisition unit and a control and protection unit;

[0036] The data acquisition unit is used to collect the operating data of the heat exchanger;

[0037] The control and protection unit is used to receive the operating condition data and adjust the air flow of the heat exchanger according to the operating condition data.

[0038] Specifically, the control and protection unit includes an analog input module, an analog output module and a digital input / output module.

[0039] Specifically, the working condition data includes pressure data and flow data;

[0040] The data acquisition unit includes a pressure sensor and a flow sensor, and both the pressure sensor and the flow sensor are connected to the control and protection unit.

[0041] Specifically, the data acquisition unit further includes a one-input and two-output power distribution type isolator, and the input end of the one-input and two-output power distribution type isolator is connected to the pressure sensor and the flow sensor;

[0042] The first output end of the one-input and two-output power distribution type isolator is connected to the control and protection unit.

[0043] Specifically, the system further includes a high-precision acquisition unit, which is connected to the heat exchanger via a TCP communication circuit, and the second output end of the one-input and two-output power distribution isolator is connected to the high-precision acquisition unit.

[0044] Specifically, the system further includes a temperature control unit, and the temperature control unit includes an air heater, and the air heater is connected to the industrial computer.

[0045] Specifically, the system further includes a temperature sensor, and the temperature sensor is connected to the analog input module.

[0046] Specifically, the system further includes a display, and the display is connected to the industrial computer.

[0047] In this embodiment, the B777 heat exchanger test bench measurement and control system is installed in a measurement and control cabinet. Figure 3 As shown, the B777 heat exchanger is Figure 4 As shown in the figure, the B777 heat exchanger test bench measurement and control system is used for flow and pressure difference testing of B777 heat exchanger and other types of heat exchangers.

[0048] The host computer control software is installed on the industrial computer. The operator uses the host computer control software to implement manual or automatic testing of the B777 heat exchanger according to the test items specified in the CMM manual. The HDMI in the industrial computer is connected to the display, and the switch is connected to the RJ45 in the industrial computer.

[0049] The control and protection unit includes a CPU 1214C+ digital input / output module, an SM1231 analog input module and an SM1232 analog output module; wherein the CPU 1214C+ digital input / output module is connected to the switch via OPC communication; the CPU 1214C+ digital input / output module includes a solenoid valve, heater control, heater operation, operation indication, fault indication, fault reset and emergency stop; the SM1231 analog input module includes a temperature sensor; the SM1232 analog output module includes a proportional valve;

[0050] In this embodiment, heater control refers to controlling the power supply and operation enable of the electric heater through the extended digital output module of CPU1214C;

[0051] Heater operation refers to collecting the heater's operating status through the extended digital input module of CPU1214C;

[0052] The operation indicator and fault indicator are the status indicators of the test system. Red means the system is faulty, and green means the system is running.

[0053] Fault reset is a fault reset button. After the fault is eliminated, you need to press the reset button so that the system can work normally;

[0054] Emergency stop is the system's emergency stop button. If an unexpected situation occurs during the test, pressing the emergency stop button can execute protective logic actions such as cutting off the main gas supply valve, discharging the remaining gas in the rear-end pipeline, and stopping the heater.

[0055] The C_DAQ acquisition system is connected to the industrial computer through TCP communication. The data acquisition unit includes the C_DAQ chassis NI-9185, the acquisition card NI-9205 / NI-9361, and the one-input and two-output power distribution type isolator. The 4-20mA signal of the pressure sensor is filtered and isolated by the one-input and two-output power distribution type isolator, and then converted into two 0-10V signals, and then enters the acquisition card NI-9205 and the SM1231 analog acquisition module for acquisition; Figure 5 shown.

[0056] The temperature control unit consists of two parts: the air heater and the heater control cabinet. The heater control cabinet panel is as follows: Figure 6 As shown in the figure, the temperature controller of the air heater is connected to the industrial computer through the RS485 communication protocol. The air heater forms a PID closed-loop system with the temperature controller through the outlet temperature sensor (K-type thermocouple). The temperature controller adjusts the power output of the thyristor in real time according to the feedback of the outlet temperature sensor to control the heating power; thus achieving the control of the target temperature. The heater control circuit is as follows Figure 7 shown.

[0057] like Figure 3 As shown, in this embodiment, the measurement and control cabinet is 1800 mm high and 900 mm long, the width of the cabinet door is 650 mm, four buttons are also provided on the surface of the measurement and control cabinet, the diameter of the buttons is 22.5 mm, and a three-color light is also provided on the upper surface of the measurement and control cabinet.

[0058] The B777 heat exchanger test bench has 3 test circuits: Figure 2 As shown, the working principles of the three loops are the same, but the test flow ranges are different. Loop 1 is a small flow loop with a maximum test flow of 10PPM; the maximum test flow of loop 2 is 220PPM; and the maximum test flow of loop 3 is 350PPM, which can meet the test of B777 heat exchanger.

[0059] During the test, the lower computer PLC programmable controller (CPU module 1214C, analog input module SM1231 and analog output module SM1232) in the control and protection unit controls the regulating valve 20 to adjust the gas supply flow. The specific control principle is that the PLC controller and the orifice flowmeter 1 form a PID closed-loop control system; the PLC controller calculates and adjusts the control signal given to the regulating valve 2 through the change in flow feedback, thereby controlling the target flow.

[0060] The gas pipeline heater 3 realizes the gas supply temperature regulation. The gas pipeline heater 3 is connected to the industrial computer through the RS485 communication protocol. The gas pipeline heater forms a PID closed-loop system through the outlet temperature sensor (K-type thermocouple) and the temperature controller. The temperature controller adjusts the power output of the thyristor in real time according to the feedback of the outlet temperature sensor to control the heating power; thereby achieving the control of the target temperature.

[0061] The data acquisition unit is a C_DAQ hardware platform system; the field sensor divides the sensor signal into two through a one-input and two-output distribution isolator; one path enters the PLC programmable controller for closed-loop control, and the other path enters the C_DAQ high-precision acquisition unit.

[0062] Under this measurement and control system architecture, the PID closed-loop operation and related logic protection during the test can be implemented in the lower-level PLC programmable controller, and will not be affected by sudden failures of the industrial computer hardware and software. After a failure occurs, the test can be terminated according to the pre-set logic in the program to protect the heat exchanger from damage due to sudden failures, increasing the reliability of the entire B777 heat exchanger test bench measurement and control system.

[0063] Those skilled in the art should understand that although the present disclosure is described in detail with reference to the aforementioned embodiments, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. B777 heat exchanger test bench high reliability measurement and control system, including an industrial computer, the industrial computer is connected to the heat exchanger, characterized in that: The system also includes a data acquisition unit and a control and protection unit; The data acquisition unit is used to collect the operating data of the heat exchanger; The control and protection unit is used to receive the operating condition data and adjust the air flow of the heat exchanger according to the operating condition data.

2. The B777 heat exchanger test bench high reliability measurement and control system according to claim 1 is characterized in that: The control and protection unit includes an analog quantity input module, an analog quantity output module and a digital quantity input / output module.

3. The B777 heat exchanger test bench high reliability measurement and control system according to claim 2 is characterized in that: The working condition data includes pressure data and flow data; The data acquisition unit includes a pressure sensor and a flow sensor, and both the pressure sensor and the flow sensor are connected to the control and protection unit.

4. The B777 heat exchanger test bench high reliability measurement and control system according to claim 3 is characterized in that: The data acquisition unit further comprises a one-input and two-output power distribution type isolator, the input end of which is connected to the pressure sensor and the flow sensor; The first output end of the one-input and two-output power distribution type isolator is connected to the control and protection unit.

5. The B777 heat exchanger test bench high reliability measurement and control system according to claim 4 is characterized in that: The system also includes a high-precision acquisition unit, which is connected to the heat exchanger via a TCP communication circuit, and the second output end of the one-input and two-output power distribution isolator is connected to the high-precision acquisition unit.

6. The B777 heat exchanger test bench high reliability measurement and control system according to claim 1 is characterized in that: The system further comprises a temperature control unit, wherein the temperature control unit comprises an air heater, and the air heater is connected to the industrial computer.

7. The B777 heat exchanger test bench high reliability measurement and control system according to claim 2 is characterized in that: The system further comprises a temperature sensor, which is connected to the analog quantity input module.

8. The B777 heat exchanger test bench high reliability measurement and control system according to claim 1 is characterized in that: The system also includes a display, which is connected to the industrial computer.

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