Engine nozzle inner diameter measuring gauge

Abstract

The utility model relates to the technical field of aircraft maintenance in aviation, in particular to an engine nozzle inner diameter measuring gauge, which comprises a casing, a first detection end is arranged on one side of the casing, a second detection end is arranged on the opposite side of the casing, and a pressure sensor is arranged between the first detection end and the second detection end. Receiving a pressure change signal transmitted by the detection end through a pressure sensor; a telescopic mechanism is arranged in the machine shell and comprises a guide cylinder, a gear box, at least two meshed and matched gears and a stepping motor, a lead screw is arranged in the guide cylinder, and a movable sleeve is arranged on the lead screw in a threaded fit mode. According to the utility model, the installation position of the stepping motor in the casing is changed on the premise of not influencing the driving of the stepping motor, so that the overall transverse length of the product is reduced to meet the use requirements of the market for measuring engine nozzles with smaller inner diameters; the design of the protective shell can protect the connector of the pressure sensor, and improves the reliability of external connection of the pressure sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft maintenance in aviation, and particularly relates to an engine nozzle inner diameter measuring gauge. Background Art

[0002] The tail nozzle is one of the components of the turbojet engine of a jet aircraft. Its main function is to eject the products after the combustion of the fuel of the jet aircraft, such as carbon dioxide, sulfur dioxide, carbon monoxide, nitrogen oxides, and small molecule hydrocarbon substances that are not completely burned, to play the role of exhausting waste gas. At the same time, it also uses the reaction force generated by the air during ejection to push the aircraft. When producing the tail nozzle of an aeroengine, it is necessary to measure the inner diameter of the tail nozzle to facilitate the production of the next process.

[0003] In the prior art, the nozzle inner diameter measuring gauge adopted uses a motor to directly drive a lead screw to measure the inner diameter of the tail nozzle. The motor and the two detection ends of the measuring gauge are on the same straight line, and the overall length of the product is relatively long. For some aircraft nozzles with a small inner diameter, it may be impossible to measure. Content of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide an engine nozzle inner diameter measuring gauge, which is used to solve the problem that the motor of the measuring gauge adopted in the prior art and the two detection ends are on the same straight line, the overall length is relatively large, and it is not applicable to the measurement of aircraft nozzles with a small inner diameter.

[0005] To achieve the above purpose and other related purposes, the present utility model provides an engine nozzle inner diameter measuring gauge, which includes a housing. A first detection end is provided on one side of the housing, and a second detection end is provided on the opposite side. The first detection end is a fixed detection end, and the second detection end is a telescopic movable detection end; a pressure sensor is provided between the first detection end and the second detection end, and the pressure change signal transmitted by the detection end is received through the pressure sensor.

[0006] A telescopic mechanism is provided in the housing, and the telescopic mechanism includes:

[0007] A guide cylinder, in which a lead screw is provided. A movable sleeve is in threaded fit with the lead screw, and the second detection end is mounted on the sleeve;

[0008] A gear box mounted at the end of the guide cylinder;

[0009] At least two meshing gears movably assembled in the gear box, and the end of the lead screw extends into the gear box and passes through one of the gears;

[0010] A stepping motor mounted at the lower end of the guide cylinder, and the output end of the stepping motor extends into the gear box and passes through another gear.

[0011] In an embodiment of the present utility model, the pressure sensor has two relatively distributed connectors, one of which extends into the gearbox to connect to the lead screw, and the other connector connects to the first detection end;

[0012] A first protective shell is provided on the inner wall of the housing, and the first protective shell protects the outside of the connector for connecting the first detection end; a second protective shell is provided on the outer surface of the gearbox, and the second protective shell protects the outside of the connector for connecting the lead screw.

[0013] In an embodiment of the present utility model, a circuit board is provided at the upper end of the housing, and at least one MCU is provided on the circuit board. The pressure sensor and the stepper motor are electrically connected to the circuit board.

[0014] In an embodiment of the present utility model, a function button module and a display screen module are further provided on the circuit board. The function button module uses a button chip, and the display screen module uses an LED driver chip;

[0015] A button is connected to the function button module, and an LED display screen is connected to the display screen module. The button and the LED display screen both extend to the outer surface of the housing.

[0016] In an embodiment of the present utility model, the telescopic movement routes of the first detection end and the second detection end are on the same straight line.

[0017] In an embodiment of the present utility model, blades are provided on both the first detection end and the second detection end, and the blades are made of titanium material.

[0018] In an embodiment of the present utility model, a battery is installed at the lower end of the housing for powering the product.

[0019] As described above, the engine nozzle inner diameter measuring gauge of the present utility model has the following beneficial effects:

[0020] 1. By designing a gearbox and assembling gears, the stepper motor can be assembled side by side up and down relative to the guide cylinder in the housing through at least two meshing gears. The stepper motor drives the lead screw through the gears. Compared with the traditional method of directly driving the lead screw by a motor, the transverse length of the product can be effectively reduced, so that it can be applied to engine nozzles with smaller inner diameters and meet the market's use requirements;

[0021] 2. By providing protective shells on the outside of the two connectors of the pressure sensor, the effects of dust prevention and anti-extrusion can be achieved, and the setting of the protective shells can also help fix the connectors, ensuring the stability of the connection of the pressure sensor relative to the first detection end and the second detection end, and improving the reception effect of the pressure change signal;

[0022] 3. The engine nozzle inner diameter measuring gauge provided by the present utility model changes the installation position of the stepper motor in the casing without affecting the stepper motor drive, so that the overall lateral length of the product is reduced to meet the use requirements of measuring engine nozzles with smaller diameters in the market. The design of the protective shell in this product can protect the connector of the pressure sensor and improve the reliability of the external connection of the pressure sensor. This product can be applied to the reliable measurement of small-diameter inner diameter nozzles of engines in the aircraft maintenance industry in the aviation field, with good applicability and high practicality. Brief Description of the Drawings

[0023] Figure 1 It shows the external structural schematic diagram of the present utility model.

[0024] Figure 2 It shows the exploded structural schematic diagram of the present utility model.

[0025] Figure 3 It shows the sectional structural schematic diagram of the present utility model

[0026] Figure 4 It shows Figure 3 The enlarged view at position A in

[0027] Figure 5 It shows the schematic diagram of the present utility model for measuring the inner diameter of the generator nozzle.

[0028] Description of Component Labels

[0029] Casing 1; First detection end 2; Second detection end 3; Guide tube 4; Lead screw 5; Sleeve 6; Gearbox 7; Gear 8; Stepper motor 9; Pressure sensor 10; Connector 101; Circuit board 11; Function key module 111; Display screen module 112; Key 12; LED display screen 13; Vane 14; Battery 15; First protective shell 16; Second protective shell 17. Detailed Embodiment

[0030] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0031] Please refer to Figures 1 to 5It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to match the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have any technical essence. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0032] Please refer to Figures 1-5 , the present utility model provides an engine nozzle inner diameter measuring gauge, which includes a machine shell 1. A first detection end 2 is provided on one side of the machine shell 1, and a second detection end 3 is provided on the opposite side. The telescopic movement routes of the first detection end 2 and the second detection end 3 are on the same straight line, and the first detection end 2 is a fixed detection end, while the second detection end 3 is a telescopic movable detection end; a pressure sensor 10 is provided between the first detection end 2 and the second detection end 3 to receive the pressure change signal transmitted by the detection end through the pressure sensor 10; a circuit board 11 is provided at the upper end of the machine shell 1, and at least one MCU is provided on the circuit board 11. The pressure sensor 10 and the stepping motor 9 are both electrically connected to the circuit board 11. A function key module 111 and a display screen module 112 are also provided on the circuit board 11. The function key module 111 uses a key chip, and the display screen module 112 uses an LED driving chip; a key 12 is connected to the function key module 111, and an LED display screen 13 is connected to the display screen module 112. Both the key 12 and the LED display screen 13 extend to the outer surface of the machine shell 1. By operating the key 12 externally, the product can be measured and used, and the measurement data and operation data can be intuitively viewed through the LED display screen 13; a battery 15 is installed at the lower end of the machine shell 1 for power supply of this product.

[0033] The casing 1 is provided with a telescopic mechanism. The telescopic mechanism includes a guiding cylinder 4, a gear box 7 installed at the end of the guiding cylinder 4, at least two meshing gears 8 movably assembled in the gear box 7, and a stepping motor 9 installed at the lower end of the guiding cylinder 4. A lead screw 5 is arranged in the guiding cylinder 4, and a movable sleeve 6 is in threaded fit with the lead screw 5. The second detection end 3 is installed on the sleeve 6. The end of the lead screw 5 extends into the gear box 7 and passes through one of the gears 8, and the output end of the stepping motor 9 extends into the gear box 7 and passes through the other gear 8. When in use for measurement, this product is placed in the engine nozzle, the first detection end 2 touches the inner wall on one side of the nozzle, the driving force is provided by the stepping motor 9 and transmitted to the lead screw 5 through at least two meshing gears 8, so that the sleeve 6 in threaded fit with the lead screw 5 drives the second detection end 3 to extend outwards until the pressure sensor 10 receives the pressure change signal, and it is judged that the second detection end 3 touches the inner wall on the opposite side of the nozzle at this time. The data obtained at this time is the inner diameter of the nozzle. After the measurement is completed, the stepping motor 9 rotates reversely to drive the second detection end 3 to reset.

[0034] By designing the gear box 7 and assembling the gears 8, the stepping motor 9 can be horizontally and juxtaposedly assembled relative to the guiding cylinder 4 in the casing 1 through at least two meshing gears 8. The stepping motor 9 drives the lead screw 5 through the gears 8. Compared with the traditional method of directly driving the lead screw 5 by a motor, the horizontal length of this product can be effectively reduced, so that it can be applied to engine nozzles with smaller inner diameters and meet the market use requirements.

[0035] The pressure sensor 10 has two relatively distributed connecting heads 101. One of the connecting heads 101 extends into the gear box 7 to connect the lead screw 5, and the other connecting head 101 connects the first detection end 2. A first protective shell 16 is arranged on the inner wall of the casing 1, and the first protective shell 16 protects the outside of the connecting head 101 for connecting the first detection end 2. A second protective shell 17 is arranged on the outer surface of the gear box 7, and the second protective shell 17 protects the outside of the connecting head 101 for connecting the lead screw 5. The design of the protective shell can play the role of dust prevention and anti-extrusion, and the protective shell can also help to fix the connecting head 101 to ensure the stability of the connection of the pressure sensor 10 relative to the first detection end 2 and the second detection end 3, and improve the reception effect of the pressure change signal.

[0036] The first detection end 2 and the second detection end 3 are both provided with blades 14. The blades 14 are made of titanium material. Titanium material has high strength, good plasticity and toughness, and can maintain the structural stability and chemical integrity of the material in extreme working environments. When titanium material is applied to instruments for measuring the inner diameter in aviation, it can not only withstand high temperature and corrosive environments, but also maintain the integrity and reliability of the blades, effectively avoiding safety accidents caused by material failure. In addition, titanium material also has good machining performance and weldability, which can meet the precision manufacturing requirements of complex components, and further improve the performance and reliability of the instruments for measuring the inner diameter in aviation.

[0037] In summary, for the inner diameter measuring gauge of the engine nozzle provided by the present utility model, without affecting the driving of the stepping motor, the installation position of the stepping motor 9 in the casing 1 is changed, so that the overall lateral length of the product is reduced, meeting the use requirements of the market for measuring the inner diameter of engine nozzles with smaller diameters; the design of the protective shell in this product can protect the connector 101 of the pressure sensor 10, improving the reliability of the external connection of the pressure sensor 10; this product can be applied to the reliable measurement of the small-diameter inner diameter nozzles of engines in the aircraft maintenance industry in the aviation field, with good applicability and high practicality. Therefore, the present utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0038] The above embodiments are only used to illustrate the principle and its effects of the present utility model, rather than to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. An engine nozzle inner diameter measuring gauge, comprising a housing (1), wherein a first detection end (2) is provided on one side of the housing (1) and a second detection end (3) is provided on the opposite side, wherein the first detection end (2) is a fixed detection end and the second detection end (3) is a retractable movable detection end; A pressure sensor (10) is provided between the first detection end (2) and the second detection end (3), and a pressure change signal transmitted by the detection end is received by the pressure sensor (10); It is characterized in that The housing (1) is provided with a telescopic mechanism, which comprises: A guide cylinder (4), wherein a screw rod (5) is provided in the guide cylinder (4), a movable sleeve (6) is threadedly engaged on the screw rod (5), and the second detection end (3) is mounted on the sleeve (6); A gear box (7) mounted on the end of the guide cylinder (4); At least two meshing gears (8) are movably mounted on a gear box (7), and the end of the screw rod (5) extends into the gear box (7) and is connected to one of the gears (8); A stepper motor (9) is mounted on the lower end of the guide cylinder (4), and an output end of the stepper motor (9) extends into the gear box (7) and is connected to another gear (8).

2. The engine nozzle inner diameter measuring gauge according to claim 1, characterized in that: The pressure sensor (10) has two relatively distributed connectors (101), one of which extends into the gear box (7) to connect to the screw rod (5), and the other connector (101) is connected to the first detection end (2); A first protective shell (16) is provided on the inner wall of the housing (1), and the first protective shell (16) protects the outside of a connecting head (101) used to connect to the first detection end (2); a second protective shell (17) is provided on the outer surface of the gear box (7), and the second protective shell (17) protects the outside of a connecting head (101) used to connect to the screw rod (5).

3. The engine nozzle inner diameter measuring gauge according to claim 1, characterized in that: A circuit board (11) is provided at the upper end of the housing (1), at least one MCU is provided on the circuit board (11), and the pressure sensor (10) and the stepping motor (9) are electrically connected to the circuit board (11).

4. The engine nozzle inner diameter measuring gauge according to claim 3, characterized in that: The circuit board (11) is also provided with a function key module (111) and a display screen module (112); the function key module (111) uses a key chip, and the display screen module (112) uses an LED driving chip; The function key module (111) is connected to a key (12), the display screen module (112) is connected to an LED display screen (13), and both the key (12) and the LED display screen (13) extend to the outer surface of the housing (1).

5. The engine nozzle inner diameter measuring gauge according to claim 1, characterized in that: The telescopic movement routes of the first detection end (2) and the second detection end (3) are on the same straight line.

6. The engine nozzle inner diameter measuring gauge according to claim 5, characterized in that: The first detection end (2) and the second detection end (3) are both provided with blades (14), and the blades (14) are made of titanium material.

7. The engine nozzle inner diameter measuring gauge according to claim 1, characterized in that: A battery (15) is installed at the lower end of the housing (1) for powering the product.

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