Aero-engine temperature detection device

Abstract

This utility model discloses an aircraft engine temperature detection device, including a first thermocouple, a second thermocouple, a third thermocouple, a fourth thermocouple, and an ECU unit. It also includes: an intermediate connecting assembly, with the first, second, third, and fourth thermocouples respectively connected to the intermediate connecting assembly, which is connected to the ECU unit; a first adjustable resistor for correcting temperature signal offset errors, located within and connected to the intermediate connecting assembly; and a second adjustable resistor for correcting temperature signal gain errors, also located within and connected to the intermediate connecting assembly. This utility model can improve signal transmission accuracy.

Description

Technical Field

[0001] This utility model relates to the field of aero-engines, specifically to an aero-engine temperature detection device. Background Technology

[0002] As a representative of modern electronic technology, the ECU (Electronic Control Unit) enables intelligent control of various devices through its powerful data processing capabilities. In the electronic digital form of the ECU, data is stored and processed in binary code. This digital approach allows the ECU to achieve rapid processing and high-precision control of complex signals. Simultaneously, the ECU possesses powerful data processing capabilities, capable of filtering, amplifying, and converting received signals. Its core advantage lies in its use of electronic digital data processing, characterized by high precision, high reliability, and strong scalability.

[0003] Abroad, research on ECU temperature measurement technology has yielded certain results. As early as the 1980s, developed countries such as the United States, Germany, and Japan began to study ECU temperature measurement technology, mainly focusing on several aspects: (1) Temperature sensors: Foreign researchers have developed various types of temperature sensors for different application scenarios, such as thermocouples, thermistors, and PN junctions. These sensors have the characteristics of fast response speed and high measurement accuracy. (2) Measurement methods: Foreign researchers have proposed a variety of temperature measurement methods, such as analog measurement, digital measurement, and hybrid measurement. Among them, digital measurement methods have the advantages of strong anti-interference ability and high measurement accuracy, and are widely used in ECU temperature measurement. (3) Data processing: Foreign researchers have studied a variety of data processing methods, such as filtering, fitting, and compensation, to improve the accuracy and reliability of temperature measurement.

[0004] A thermocouple consists of wires made of two different materials: nickel-chromium and nickel-aluminum (or nickel-silicon). When their two junctions are at different temperatures, an electromotive force (i.e., voltage) is generated in the circuit. The voltage difference is proportional to the temperature difference, so the temperature can be determined by measuring this voltage. Thermocouples transmit voltage signals in the millivolt range. The output voltage signal of a thermocouple is very small, typically between a few microvolts and tens of millivolts. This means the voltage signal generated by a thermocouple is weak and easily affected by external electromagnetic interference. When multiple thermocouples are connected in parallel, the mutual inductance between the signal wires can become a major cause of signal distortion. Therefore, improving the signal transmission accuracy is a current challenge. Utility Model Content

[0005] This invention provides a temperature detection device for aero-engines that can improve signal transmission accuracy.

[0006] Aircraft engine temperature detection device

[0007] The aircraft engine temperature detection device includes a first thermocouple, a second thermocouple, a third thermocouple, a fourth thermocouple, an ECU unit, and also includes:

[0008] The intermediate connection assembly is connected to the first thermocouple, the second thermocouple, the third thermocouple, and the fourth thermocouple, respectively. The intermediate connection assembly is connected to the ECU unit.

[0009] A first adjustable resistor is used to correct temperature signal offset error. The first adjustable resistor is located within and connected to the intermediate connection component.

[0010] A second adjustable resistor is used to correct the gain error of the temperature signal. The second adjustable resistor is located within and connected to the intermediate connection component.

[0011] For signal acquisition using multiple thermocouples, even without an input signal, a small non-zero output voltage (called offset voltage) may still exist in the actual circuit due to the mutual inductance between the signal lines. In this invention, the output signal is adjusted by a first adjustable resistor to ensure that the output is accurately zero when the input signal is zero. The first adjustable resistor can eliminate the aforementioned voltage offset, improving the accuracy of temperature acquisition. Furthermore, due to differences in manufacturing processes, individual thermocouples and wiring components may not perfectly conform to their nominal values. In this invention, the steepness of the gain curve of the acquired temperature signal is adjusted by a second adjustable resistor, i.e., adjusting the slope of the gain curve, which can compensate for these inconsistencies. Based on the above, this invention can improve the signal transmission accuracy. Attached Figure Description

[0012] Figure 1 This is a structural diagram of an aircraft engine temperature detection device.

[0013] Figure 2 This is a simplified circuit diagram of an aircraft engine temperature detection device.

[0014] Figure 3 This is a 3D view of the junction box.

[0015] Figure 4 This is a cross-sectional structural diagram of the armored line mounting base.

[0016] Labels in the attached diagram:

[0017] First thermocouple T1, second thermocouple T2, third thermocouple T3, fourth thermocouple T4, ECU unit U1, intermediate connection assembly A, junction box 1, box body 1a, end cover 1b, first mounting hole 1c, mounting plate 1d, reinforcing ramp 1e, mounting hole 1f, second mounting hole 1g, first wiring assembly 2, second wiring assembly 3, third wiring assembly 4, fourth wiring assembly 5, guide post a, armored wire b, first mounting base c, first mounting hole d, armored wire mounting base e, connector 6, first adjustable resistor B, second adjustable resistor C. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing" and other such terms should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components, unless otherwise explicitly limited.

[0022] like Figures 1 to 4 As shown, the aircraft engine temperature detection device of this utility model includes a first thermocouple T1, a second thermocouple T2, a third thermocouple T3, a fourth thermocouple T4, an ECU unit U1, an intermediate connecting component A, a first adjustable resistor B, and a second adjustable resistor C. The following is a detailed description of each part and the relationship between them.

[0023] The first thermocouple T1, the second thermocouple T2, the third thermocouple T3, and the fourth thermocouple T4 are installed in different parts of the aircraft engine combustion chamber to collect temperature data from these different parts of the combustion chamber. The first thermocouple T1, the second thermocouple T2, the third thermocouple T3, and the fourth thermocouple T4 are each connected to an intermediate connecting assembly A, which is connected to the ECU unit U1.

[0024] The intermediate connection component A includes a junction box 1, a first wiring component 2, a second wiring component 3, a third wiring component 4, a fourth wiring component 5, and a connector 6. The junction box 1 includes a box body 1a and an end cover 1b. The box body 1a has an opening. The end cover 1b mates with the opening of the box body 1a and is fixed to the box body 1a. The box body 1a and the end cover 1b can be fixed by interference fit or by welding. The top surface of the box body 1a is provided with a first mounting hole 1c. After the connector 6 mates with the first mounting hole 1c, the connector 6 and the box body 1a are fastened together by fasteners, which can be screws or rivets.

[0025] Junction box 1 also includes mounting plate 1d and reinforcing inclined plate 1e. Mounting plate 1d is fixed to end cover 1b. Reinforcing inclined plate 1e is fixed to end cover 1b and mounting plate 1d respectively. Reinforcing inclined plate 1e is a triangular plate. Mounting plate 1d is provided with mounting hole 1f for fasteners to pass through.

[0026] The first adjustable resistor B is used to correct the offset error of the temperature signal. The first adjustable resistor B is located within and connected to the intermediate connection component A. For signal acquisition using multiple thermocouples, even without an input signal, a small non-zero output voltage (called offset voltage) may still exist in the actual circuit due to the mutual inductance between the signal lines. The first adjustable resistor B adjusts the output signal to ensure that when the input signal is zero, the output is also accurately zero. The first adjustable resistor B can eliminate the aforementioned voltage offset, thereby improving the transmission accuracy of the temperature signal.

[0027] The second adjustable resistor C is used to correct the gain error of the temperature signal. The second adjustable resistor C is located inside and connected to the intermediate connection component A. Due to differences in manufacturing processes, the individual thermocouples and wiring components may not perfectly conform to the nominal values. By adjusting the steepness of the gain curve of the acquired temperature signal through the second adjustable resistor C, i.e., adjusting the slope of the gain curve, these inconsistencies can be compensated for.

[0028] In this utility model, one end of the first wiring assembly 2 is connected to the first thermocouple T1, one end of the second wiring assembly 3 is connected to the second thermocouple T2, one end of the third wiring assembly 4 is connected to the third thermocouple T3, and one end of the fourth wiring assembly 2 is connected to the fourth thermocouple T4.

[0029] The other ends of the first wiring assembly 2, the second wiring assembly 3, the third wiring assembly 4, and the fourth wiring assembly 5 are located inside the junction box 1 and are connected in parallel to be electrically connected to the first adjustable resistor B and the second adjustable resistor C, respectively. The first adjustable resistor B and the second adjustable resistor C are located inside the junction box 1. The first adjustable resistor B and the second adjustable resistor C are also electrically connected to the connector 6, which is electrically connected to the ECU unit U1. The adjusted signal is output to the ECU unit U1 through the connector 6.

[0030] The first adjustable resistor B and the second adjustable resistor C can be mounted on the same PCB board, which is located inside the junction box 1 and is fastened to the junction box 1 as a whole using screws. The PCB board is provided with input connection terminals and output connection terminals. Therefore, the other end of the first wiring assembly 2, the second wiring assembly 3, the third wiring assembly 4, and the fourth wiring assembly 5 are electrically connected to the input connection terminals, and the connector 6 is connected to the input connection terminals through wires.

[0031] The first wiring assembly 2, the second wiring assembly 3, the third wiring assembly 4, and the fourth wiring assembly 5 each include a guide post a for connecting a thermocouple and an armored wire b for connecting an adjustable resistor. The guide post a is fixed to the armored wire b, and the armored wire b is electrically connected to an input connection terminal on the PCB board. The first wiring assembly 2, the second wiring assembly 3, the third wiring assembly 4, and the fourth wiring assembly 5 also include a first mounting base c, which is fitted onto and fixed to the guide post a. The first mounting base c has a first mounting hole d.

[0032] The first wiring assembly 2, the second wiring assembly 3, the third wiring assembly 4, and the fourth wiring assembly 5 all include an armored wire mounting base e, which is fixed to the armored wire b. A second mounting hole 1g is provided on two opposite sides of the housing 1a. After the armored wire mounting base e and the second mounting hole 1g are engaged, the armored wire mounting base e and the housing 1a are solid. With this structure, when a pulling force is applied to the armored wire b, separation from the connection terminal on the PCB board can be avoided.

Claims

1. An aircraft engine temperature detection device, comprising a first thermocouple (T1), a second thermocouple (T2), a third thermocouple (T3), a fourth thermocouple (T4), and an ECU unit (U1), characterized in that, Also includes: The intermediate connection assembly (A) is connected to the first thermocouple (T1), the second thermocouple (T2), the third thermocouple (T3) and the fourth thermocouple (T4), respectively. The intermediate connection assembly (A) is connected to the ECU unit (U1). A first adjustable resistor (B) is used to correct temperature signal offset error. The first adjustable resistor (B) is located inside and connected to the intermediate connection component (A). A second adjustable resistor (C) is used to correct the gain error of the temperature signal. The second adjustable resistor (C) is located inside and connected to the intermediate connection component (A).

2. The aircraft engine temperature detection device according to claim 1, characterized in that, The intermediate connection assembly (A) includes a junction box (1), a first wiring assembly (2), a second wiring assembly (3), a third wiring assembly (4), a fourth wiring assembly (5), and a connector (6). One end of the first wiring assembly (2) is connected to the first thermocouple (T1), one end of the second wiring assembly (3) is connected to the second thermocouple (T2), one end of the third wiring assembly (4) is connected to the third thermocouple (T3), and one end of the fourth wiring assembly (5) is connected to the fourth thermocouple (T4). The other ends of the first wiring assembly (2), the second wiring assembly (3), the third wiring assembly (4), and the fourth wiring assembly (5) are located in the junction box (1) and are connected in parallel to the first adjustable resistor (B) and the second adjustable resistor (C) respectively. The first adjustable resistor (B) and the second adjustable resistor (C) are located in the junction box (1). The first adjustable resistor (B) and the second adjustable resistor (C) are also electrically connected to the connector (6) respectively. The connector (6) is electrically connected to the ECU unit (U1).

3. The aircraft engine temperature detection device according to claim 2, characterized in that, The first wiring assembly (2), the second wiring assembly (3), the third wiring assembly (4), and the fourth wiring assembly (5) all include a guide post (a) for connecting a thermocouple and an armored wire (b) for connecting an adjustable resistor, with the guide post (a) and the armored wire (b) fixed together.

4. The aircraft engine temperature detection device according to claim 3, characterized in that, The first wiring assembly (2), the second wiring assembly (3), the third wiring assembly (4), and the fourth wiring assembly (5) all include a first mounting base (c), which is fitted onto the guide post (a) and fixed to the guide post (a). The first mounting base (c) is provided with a first mounting hole (d).

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