A device for blocking foreign matter / water vapor in an aircraft tire pressure sensor

Abstract

The application discloses a device for preventing foreign matters and water vapor from entering an airplane tire pressure sensor, which is characterized by improving the pressure-resistant shell structure of the airplane tire pressure sensor, adding a blocking device composed of a steel wire shock pad, a blocking film and a porous gasket in the airplane tire pressure sensor to prevent foreign matters and water vapor from entering the airplane tire pressure sensor, protecting the pressure sensing circuit components in the airplane tire pressure sensor from being eroded by foreign matters and water vapor and ensuring that the airplane tire pressure sensor can normally work under the severe working conditions of the airplane. The application adds four drainage holes in the pressure-resistant shell of the airplane tire pressure sensor, the drainage holes are communicated with the water guide holes of the pressure-resistant shell and play a role in draining water, so that the airplane tire pressure sensor is prevented from accumulating water vapor and the internal and external pressures are kept balanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the mechanical field of aircraft tire pressure sensor, in particular to a device for blocking foreign matter / water vapor in an aircraft tire pressure sensor. BACKGROUND

[0002] The aircraft tire pressure sensor is mainly used for detecting the tire pressure of the aircraft wheel, assisting the pilot and the ground crew to determine the tire pressure state of the aircraft, and realizing the health monitoring of the aircraft by monitoring the tire pressure state. Since the aircraft tire pressure sensor is installed on the aircraft wheel, the working condition of the sensor is relatively harsh, and the sensor needs to withstand high and low temperature, heat and humidity, rain and other environments. Water vapor, foreign matter and the like can enter the inside of the sensor through the air vent of the sensor, corrode and block the air vent, and affect the normal use of the sensor. To solve this problem, the present application provides a device for blocking foreign matter / water vapor in an aircraft tire pressure sensor.

[0003] Patent CN213903285U discloses a gas sensor protection device, which increases the protection device in the gas sensing probe, designs the flow guide groove and the asymmetric air hole, and realizes the dustproof and waterproof purposes without affecting the air volume. However, the powder metallurgy sheet and sintered mesh used in the device have large pore size, small number and large gap and pore, which is not conducive to the blocking of foreign matter and water vapor and the transmission of gas. SUMMARY

[0004] To overcome the problem that the prior art cannot effectively block foreign matter and water vapor entering the aircraft tire pressure sensor with gas, the present application provides a device for blocking foreign matter / water vapor in an aircraft tire pressure sensor.

[0005] A device for blocking foreign matter / water vapor in an aircraft tire pressure sensor, comprising a pressure-resistant shell, a first steel wire shock pad, a second steel wire shock pad, a first blocking film, a second blocking film, a porous gasket, a collar and a pressure sensing circuit assembly.

[0006] The second steel wire shock pad is located in the pressure-resistant shell, and the conical end face of the second steel wire shock pad is attached to the conical surface of the shock pad support platform at the center of the bottom surface of the second steel wire shock pad. The first blocking film is coated on the conical end face of the second steel wire shock pad. The upper surface and the lower surface of the first steel wire shock pad are respectively coated with the second blocking film. The first steel wire shock pad is located on the upper surface of the second steel wire shock pad, and the second blocking film coated on the lower surface of the first steel wire shock pad is attached to the upper surface of the second steel wire shock pad. The porous gasket is placed on the upper surface of the second blocking film on the upper surface of the first steel wire shock pad. The collar is installed on the upper surface of the porous gasket.

[0007] The pressure sensing circuit assembly is located at the upper end of the pressure resistant shell and is fixed on the upper shell of the pressure sensor by bolts. Three wire posts for transmitting pressure signals are uniformly distributed on the pressure sensing circuit assembly, and the collected pressure signals are transmitted to the calculation circuit of the pressure sensor through the pins inside the wire posts.

[0008] The outer circumferential surface of the small diameter end of the pressure resistant shell is a threaded surface connected with the air valve on the wheel hub. The center of the bottom surface of the small diameter end of the pressure resistant shell has a shock pad support platform; the upper surface of the shock pad support platform is a tapered surface matched with the tapered end of the second steel wire shock pad. Four water guide holes are uniformly distributed on the outer edge of the tapered surface, and each water guide hole is in communication with a drainage hole; the center of the shock pad support platform has an axial through hole with a diameter of 1mm, which is a gas guide hole for guiding the tire gas into the pressure sensor pressure resistant shell. The inner surface of the small diameter end of the pressure resistant shell is a stepped surface; the end surface formed by the stepped difference at the hole of each water guide hole is the support surface of the second steel wire shock pad. There is an annular ring mounting groove on the inner surface of the small diameter end of the pressure resistant shell. The inner diameter of the large diameter end of the pressure resistant shell is the same as the outer diameter of the pressure sensing circuit assembly.

[0009] The drainage hole has a diameter of 1mm and penetrates the pressure resistant shell; the angle between the center line of each drainage hole and the horizontal plane is 30°, and the inlet of each drainage hole is in communication with the water guide hole.

[0010] The first steel wire shock pad is composed of an equal diameter section and a tapered section, and the axial length of the equal diameter section: the axial length of the tapered section = 2:1. The angle of the tapered section is 120°. The first steel wire shock pad is made of 0.05mm diameter stainless steel wire by free coiling.

[0011] The second steel wire shock pad is disc-shaped. It is also made of 0.05mm diameter stainless steel wire by free coiling.

[0012] The thickness of the first and second barrier membranes is 0.5mm, which is made of multi-layer PTFE membrane, and each layer of PTFE membrane has a thickness of 0.05mm, which is pressed by multi-layer stacking, for blocking water vapor in the high pressure gas entering the pressure resistant shell.

[0013] The porous gasket is uniformly distributed with a plurality of gas guide holes. The diameter of the gas guide hole is 0.5-1.0mm, and the center distance between adjacent two holes is 2mm.

[0014] The application improves the pressure-resistant shell structure of the aircraft tire pressure sensor, adds a barrier device composed of a steel wire shock pad, a barrier film, a porous gasket and the like in the aircraft tire pressure sensor, and is used for preventing foreign matters and water vapor from entering the aircraft tire pressure sensor, protecting the pressure sensing circuit component in the aircraft tire pressure sensor from erosion of foreign matters and water vapor, and ensuring that the aircraft tire pressure sensor can normally work under the severe working conditions of the aircraft.

[0015] Compared with the prior art, the application has the beneficial effects that:

[0016] 1. The device for preventing foreign matters / water vapor from entering the aircraft tire pressure sensor improves the pressure-resistant shell structure, adds a barrier device composed of a steel wire shock pad and a barrier film, a porous gasket and the like in the pressure-resistant shell, and can effectively prevent foreign matters and water vapor from entering the aircraft tire pressure sensor.

[0017] 2. The application adds four drainage holes in the pressure-resistant shell of the aircraft tire pressure sensor, the drainage holes are communicated with the water guide holes of the pressure-resistant shell, play a drainage role, ensure that the aircraft tire pressure sensor does not accumulate water vapor, and keep the internal and external pressure balanced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the application;

[0019] Figure 2 is a structural schematic diagram of the pressure-resistant shell;

[0020] Figure 3 is a structural schematic diagram of the first steel wire shock pad;

[0021] Figure 4 is a structural schematic diagram of the second steel wire shock pad;

[0022] Figure 5 is a structural schematic diagram of the first barrier film;

[0023] Figure 6 is a structural schematic diagram of the porous gasket;

[0024] Figure 7 is a schematic diagram of the working principle of the application.

[0025] In the figure: 1. pressure-resistant shell; 2. first steel wire shock pad; 3. second steel wire shock pad; 4. first barrier film; 5. second barrier film; 6. porous gasket; 7. collar; 8. pressure sensing circuit component; 9. tire gas; 10. air inlet hole; 11. drainage hole; 12. water guide hole; 13. air guide hole. DETAILED DESCRIPTION

[0026] The embodiment is a device for blocking foreign matter / water vapor in an airplane tire pressure sensor, comprising a pressure-resistant shell 1, a first steel wire shock pad 2, a second steel wire shock pad 3, a first blocking film 4, a second blocking film 5, a porous pad 6, a collar 7 and a pressure sensing circuit assembly 8.

[0027] The second steel wire shock pad 3 is located in the pressure-resistant shell 1, and the tapered end surface of the second steel wire shock pad is attached to the tapered surface of the shock pad support platform in the center of the bottom surface of the second steel wire shock pad. The first blocking film 4 is coated on the tapered end surface of the second steel wire shock pad. The upper surface and the lower surface of the first steel wire shock pad 2 are respectively coated with the second blocking film 5. The first steel wire shock pad is located on the upper surface of the second steel wire shock pad, and the second blocking film 5 coated on the lower surface of the first steel wire shock pad is attached to the upper surface of the second steel wire shock pad. The porous pad 6 is placed on the upper surface of the second blocking film on the upper surface of the first steel wire shock pad 2. The collar 7 is installed on the upper surface of the porous pad.

[0028] The pressure sensing circuit assembly 8 is located at the upper end of the pressure-resistant shell 1 and is fixed on the upper shell of the pressure sensor by bolts. Three wire posts for transmitting pressure signals are uniformly distributed on the pressure sensing circuit assembly, and the collected pressure signals are transmitted to the solving circuit of the pressure sensor through the pins inside the wire posts.

[0029] The pressure-resistant shell 1 is a hollow rotary body, and its shape is an inverted convex letter. The outer circumferential surface of the small outer diameter end of the pressure-resistant shell is a threaded surface connected to the air valve of the wheel hub. The inner circumferential surface of the small outer diameter end of the pressure-resistant shell is a stepped surface. There is a shock pad support platform in the center of the bottom surface of the small inner diameter end. The upper surface of the shock pad support platform is a tapered surface matched with the tapered end of the second steel wire shock pad. Four water guide holes 12 are uniformly distributed on the outer edge of the tapered surface, and each water guide hole is in communication with a drainage hole 11. There are four drainage holes with a diameter of 1 mm, which penetrate through the pressure-resistant shell. The angle between the center line of each drainage hole and the horizontal plane is 30°, and the inlet of each drainage hole is in communication with the water guide hole. The center of the shock pad support platform has an axial through hole with a diameter of 1 mm, which is a gas guide hole 13 for guiding the tire gas of the wheel into the pressure-resistant shell of the pressure sensor. The inner surface of the small inner diameter end of the pressure-resistant shell 1 is a stepped surface. The end surface formed by the stepped difference at the opening of each water guide hole is the support surface of the second steel wire shock pad 3. There is an annular collar mounting groove on the inner surface of the small inner diameter end of the pressure-resistant shell 1. The inner diameter of the large diameter end of the pressure-resistant shell 1 is the same as the outer diameter of the pressure sensing circuit assembly 8.

[0030] The first steel wire shock pad 2 is a circular block, composed of an equal diameter section and a tapered section, and the axial length of the equal diameter section: the axial length of the tapered section = 2:1. The angle of the tapered section is 120°. The first steel wire shock pad uses stainless steel wire with a diameter of 0.05 mm, which is made by free coiling in the prior art.

[0031] The second steel wire shock pad 2 is a circular disc. It is also made by free coiling of stainless steel wire with a diameter of 0.05 mm.

[0032] In this embodiment, a hydrophobic coating is prepared on the surface of the stainless steel wire by a conventional dip coating process to effectively reduce the accumulation and retention of water vapor on the first steel wire shock pad 2 and the second steel wire shock pad 3. The hydrophobic coating is a G350S fluorosilicon resin coating material. During dip coating, the first steel wire shock pad 2 and the second steel wire shock pad 3 are immersed in the G350S fluorosilicon resin solution, soaked for 2 min, then taken out and drained, and placed in an oven for baking at 150°C for 30 min to complete the preparation of the hydrophobic coating.

[0033] The first barrier film 4 and the second barrier film 5 have the same structure and are both made of multiple layers of PTFE film with a total thickness of 0.5 mm. Each layer of PTFE film has a thickness of 0.05 mm and is pressed by multiple layers of lamination to block the water vapor entering the high-pressure gas in the pressure-resistant shell 1.

[0034] The porous gasket 6 is made of PH15-5 stainless steel. The porous gasket is uniformly distributed with several gas guide holes 13. The diameter of the gas guide holes is 0.5-1.0 mm, and the center distance between adjacent two holes is 2 mm.

[0035] The collar 7 is made of stainless steel material and is fixed and limited by the clamping groove reserved inside the cavity of the pressure-resistant shell 1, which is used to fasten the porous gasket 6.

[0036] The pressure sensing circuit assembly 8 uses the prior art to collect the tire gas entering from the pressure-resistant shell 1, and completes the tire gas information processing and sending work.

[0037] When the tire pressure sensor is installed on the wheel, the tire gas 9 enters the tire pressure sensor from the air inlet hole 10 of the pressure-resistant shell 1, and then enters the pressure sensing circuit assembly 8 through the first barrier film 4, the second steel wire shock pad 3, the second barrier film 5, the first steel wire shock pad 2 and the porous pad 6. In this process, the second barrier film and the first barrier film block the water vapor in the gas from passing through by using their material properties, and the first steel wire shock pad and the second steel wire shock pad prevent foreign matter from passing through with the gas by using the fine mesh structure. When the water guide hole 12 in the pressure-resistant shell is filled with water vapor blocked by condensation, the water vapor is discharged through the drain hole 11 communicating with the water guide hole. After the tire gas is filtered, the tire gas is received by the pressure sensing circuit assembly, and the wheel tire pressure collection work is completed.

Claims

1. A device for blocking foreign matter / moisture in an aircraft tire pressure sensor, characterized in that, It includes a pressure-resistant housing (1), a first steel wire shock-absorbing pad (2), a second steel wire shock-absorbing pad (3), a first barrier membrane (4), a second barrier membrane (5), a porous gasket (6), a retaining ring (7), and a pressure-sensing circuit assembly (8); Wherein: the second wire shock absorber (3) is located inside the pressure-resistant housing (1), and the conical end face of the second wire shock absorber is in contact with the conical surface of the shock absorber support platform at the center of the bottom surface of the second wire shock absorber; a first barrier film (4) is laid on the conical end face of the second wire shock absorber; a second barrier film (5) is laid on the upper and lower surfaces of the first wire shock absorber (2); the first wire shock absorber is located on the upper surface of the second wire shock absorber, and the second barrier film (5) laid on the lower surface of the first wire shock absorber is in contact with the upper surface of the second wire shock absorber; a porous gasket (6) is placed on the upper surface of the second barrier film located on the upper surface of the first wire shock absorber (2); a retaining ring (7) is installed on the upper surface of the porous gasket; The pressure-sensing circuit assembly (8) is located at the upper end of the pressure-resistant housing (1) and is fixed to the upper housing of the pressure sensor by bolts. Three terminals for transmitting pressure signals are evenly distributed on the pressure-sensing circuit assembly. The collected pressure signals are transmitted to the calculation circuit of the pressure sensor through the pins located inside the terminals.

2. The device for blocking foreign matter / moisture in an aircraft tire pressure sensor as described in claim 1, characterized in that, The outer circumferential surface of the small outer diameter end of the pressure-resistant housing (1) is a threaded surface that connects to the valve on the wheel hub; there is a shock-absorbing pad support platform at the center of the bottom surface of the small inner diameter end of the pressure-resistant housing; the upper surface of the shock-absorbing pad support platform is a conical surface that mates with the conical end of the second steel wire shock-absorbing pad; four water guide holes (12) are evenly distributed at the outer edge of the conical surface, and each water guide hole is connected to the drain hole (11); there is an axially penetrating air guide hole (13) with a diameter of 1 mm at the center of the shock-absorbing pad support platform, which is used to guide the air from the wheel tire into the pressure sensor pressure-resistant housing; the inner surface of the small inner diameter end of the pressure-resistant housing (1) is a stepped surface; the end face formed by the step difference at the opening of each water guide hole is the support surface of the second steel wire shock-absorbing pad (3); there is an annular retaining ring mounting groove on the inner circular surface of the small inner diameter end of the pressure-resistant housing (1); the inner diameter of the large diameter end of the pressure-resistant housing is the same as the outer diameter of the pressure-sensing circuit assembly (8).

3. The device for blocking foreign matter / moisture in an aircraft tire pressure sensor as described in claim 2, characterized in that, The diameter of each drain hole is 1 mm, and each drain hole penetrates the pressure-resistant shell. The angle between the centerline of each drain hole and the horizontal plane is 30°, and the inlet of each drain hole is connected to the water guide hole.

4. The device for blocking foreign matter / moisture in an aircraft tire pressure sensor as described in claim 1, characterized in that, The first steel wire damping pad (2) is composed of a constant diameter section and a conical section, and the axial length of the constant diameter section is 2:1 with the axial length of the conical section; the angle of the conical section is 120°; the first steel wire damping pad is made of freely coiled stainless steel wire with a diameter of 0.05mm. The second steel wire shock absorber (3) is disc-shaped; it is also made of stainless steel wire with a diameter of 0.05mm by free winding.

5. The device for blocking foreign matter / moisture in an aircraft tire pressure sensor as described in claim 1, characterized in that, The thickness of the first barrier membrane (4) and the second barrier membrane (5) is 0.5 mm. They are made of multi-layer PTFE membranes, each with a thickness of 0.05 mm. They are formed by pressing multiple layers together and are used to block water vapor from entering the high-pressure gas in the pressure-resistant shell (1).

6. The device for blocking foreign matter / moisture in an aircraft tire pressure sensor as described in claim 1, characterized in that, The porous gasket (6) has several air guide holes (13) evenly distributed on it; the diameter of the air guide holes is 0.5 to 1.0 mm, and the center distance between two adjacent holes is 2 mm.

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