Air tightness detection device for air cavity of hydraulic buffer

By using a pressure reducer and on-machine pressure gauge in the air tightness detection device of the hydraulic buffer air cavity, the problems of excessive pressure of the nitrogen cylinder and poor detection accuracy are solved, ensuring product safety and detection accuracy.

CN222318368UActive Publication Date: 2025-01-07LINGYUN GROUP WUHAN
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202420248140.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-31
Publication Date
2025-01-07
Estimated Expiration
2034-01-31

AI Technical Summary

Technical Problem

The existing hydraulic buffer air tightness detection methods have problems such as excessive pressure of nitrogen cylinders leading to product damage, poor pressure detection accuracy, and the sealing of nitrogen cylinder valves affecting detection accuracy.

Method used

A hydraulic buffer air tightness detection device including an air supply mechanism and a pressure measuring mechanism is designed. The high-pressure gas in the nitrogen cylinder is reduced to a suitable pressure and then transmitted to the buffer air cavity. And the pressure change in the air chamber is detected through the on-machine pressure gauge, and a pressure-keeping valve is set to prevent errors caused by leakage of nitrogen cylinders.

Benefits of technology

It effectively prevents damage to the product by high-pressure gas, improves the accuracy of pressure detection, and ensures the accuracy of airtightness detection.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222318368U_ABST
    Figure CN222318368U_ABST
Patent Text Reader

Abstract

The utility model discloses an air tightness detection device for an air cavity of a hydraulic buffer. The air tightness detection device comprises an air supply mechanism, a pressure measuring mechanism and a connecting hose, the gas supply mechanism comprises a pressure reducer, and one end of the pressure reducer is used for being connected with an outlet of a nitrogen cylinder; the pressure measuring mechanism comprises a gas charging connector, a pressure retaining valve and an onboard pressure gauge; one end of the connecting hose is connected with the other end of the pressure reducer, and the other end of the connecting hose is communicated with the other end of the pressure retaining valve. The technical scheme provided by the utility model has the beneficial effects that after high-pressure gas in the nitrogen cylinder is decompressed to a certain pressure through the pressure reducer, the high-pressure gas is transmitted into the gas cavity of the buffer, so that the buffer product can be prevented from being damaged due to overhigh pressure of the filled gas; the on-board pressure gauge is adopted to observe the pressure change of the buffer air cavity to detect the air tightness of the buffer air cavity, and the on-board pressure gauge is close to the buffer air cavity, so that the pressure detection accuracy is high.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection device for an air cavity of a hydraulic buffer. Background Art

[0002] The hydraulic buffer of a certain type of aircraft is used to absorb the pressure pulse generated when the hydraulic pump supplies pressure and maintain the system pressure stable. The inside of the buffer is divided into an air chamber and an oil chamber by a rubber film. According to technical requirements, a certain amount of nitrogen needs to be filled into the air chamber through the inflation nozzle on the buffer. According to the collected pressure changes in the air chamber, the sealing of the air chamber is tested.

[0003] The existing method for testing the air tightness of the air cavity of the hydraulic buffer is to connect a nitrogen bottle equipped with a pressure gauge to the inflation nozzle of the buffer through a hose, open the valve of the nitrogen bottle to inflate the air cavity of the buffer, and when the pressure indicated by the pressure gauge of the nitrogen bottle reaches the buffer inflation pressure, close the valve of the nitrogen bottle, and determine whether the sealing of the air cavity meets the requirements based on the changes in the pressure gauge on the nitrogen bottle.

[0004] This detection method has the following disadvantages: (1) The buffer is inflated directly with a nitrogen bottle. The pressure in the nitrogen bottle is usually more than twice the buffer inflation pressure. If the nitrogen bottle is not closed in time, the buffer product may be damaged. (2) The buffer is installed on the aircraft, and the buffer inflation pressure collection point is at the ground nitrogen bottle outlet, which is far away from the buffer air cavity and has poor pressure detection accuracy. (3) When testing the air tightness of the buffer air cavity, due to the poor sealing of the nitrogen bottle valve, a small amount of nitrogen will overflow from the nitrogen bottle valve to the pressure gauge, which will affect the accuracy of the hydraulic buffer air cavity air tightness test. Utility Model Content

[0005] In view of this, it is necessary to provide a hydraulic buffer air cavity air tightness detection device to solve the technical problems of using a nitrogen bottle to directly inflate the buffer, which may easily cause damage to the buffer product and poor pressure detection accuracy.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a hydraulic buffer air cavity air tightness detection device, including an air supply mechanism, a pressure measuring mechanism and a connecting hose;

[0007] The gas supply mechanism includes a pressure reducer, one end of which is used to be connected to the outlet of the nitrogen bottle;

[0008] The pressure measuring mechanism includes an inflatable joint, a pressure-maintaining valve and an onboard pressure gauge, one end of the inflatable joint is used to connect with the inflatable port of the hydraulic buffer air cavity, one end of the pressure-maintaining valve is connected with the other end of the inflatable joint, and the onboard pressure gauge is used to detect the air pressure in the inflatable joint;

[0009] One end of the connecting hose is connected to the other end of the pressure reducer, and the other end of the connecting hose is communicated with the other end of the pressure maintaining valve.

[0010] In some embodiments, the gas supply mechanism further includes a gas cylinder connector, one end of which is connected to one end of the pressure reducer, and the other end of which is used to be connected to an outlet of a nitrogen cylinder.

[0011] In some embodiments, the gas supply mechanism further includes a gas cylinder pressure gauge, and the gas cylinder pressure gauge is used to measure the pressure of the nitrogen cylinder.

[0012] In some embodiments, the gas supply mechanism also includes a first connecting pipe and a second connecting pipe, and a gas supply tee, one end of the first connecting pipe is connected to one end of the gas cylinder connector, the other end of the first connecting pipe is connected to the first interface of the gas supply tee, the second interface of the gas supply tee is connected to the gas cylinder pressure gauge, one end of the second connecting pipe is connected to the third interface of the gas supply tee, and the other end of the second connecting pipe is connected to one end of the pressure reducer.

[0013] In some embodiments, the air supply mechanism further includes an exhaust valve, an inlet of the exhaust valve is connected to the other end of the pressure reducer.

[0014] In some embodiments, the gas supply mechanism further includes a ground pressure gauge, which is connected to the other end of the pressure reducer, and is used to measure the pressure of the gas after passing through the pressure reducer.

[0015] In some embodiments, the air supply mechanism also includes a four-way valve, a first interface of the four-way valve is connected to the other end of the pressure reducer, a second interface of the four-way valve is connected to one end of a connecting hose, a third interface of the four-way valve is connected to the inlet of the exhaust valve, and a fourth interface of the four-way valve is connected to the ground pressure gauge.

[0016] In some embodiments, the pressure measuring mechanism also includes a third connecting pipe and a pressure measuring tee, one end of the third connecting pipe is connected to the other end of the inflation joint, the other end of the third connecting pipe is connected to the first interface of the pressure measuring tee, the second interface of the pressure measuring tee is connected to the on-board pressure gauge, and the third interface of the pressure measuring tee is connected to one end of the pressure maintaining valve.

[0017] In some embodiments, the first connecting tube, the second connecting tube, and the third connecting tube are all hard connecting tubes.

[0018] In some embodiments, the hydraulic buffer air cavity air tightness detection device also includes a suitcase, and the air supply mechanism, the pressure measuring mechanism and the connecting hose are all arranged in the suitcase.

[0019] Compared with the prior art, the technical solution proposed by the utility model has the following beneficial effects: the high-pressure gas in the nitrogen bottle is reduced to a certain pressure through a pressure reducer and then transmitted to the buffer air cavity, which can prevent the buffer product from being damaged due to excessively high filling gas pressure; an on-board pressure gauge is used to observe the pressure change in the buffer air cavity to detect the air tightness of the buffer air cavity. Since the on-board pressure gauge is close to the buffer air cavity, the pressure detection accuracy is high; in addition, a pressure-maintaining valve is provided to prevent errors in pressure detection caused by leakage of the nitrogen bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a hydraulic buffer air cavity air tightness detection device provided by the utility model;

[0021] In the figure: 1-air supply mechanism, 11-pressure reducer, 12-gas cylinder joint, 13-gas cylinder pressure gauge, 14-first connecting pipe, 15-second connecting pipe, 16-exhaust valve, 17-ground pressure gauge, 18-four-way, 19-gas supply three-way, 2-pressure measuring mechanism, 21-inflating joint, 22-pressure maintaining valve, 23-on-board pressure gauge, 24-third connecting pipe, 25-pressure measuring three-way, 3-connecting hose, 4-nitrogen cylinder. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0023] Please refer to Figure 1 The utility model provides a hydraulic buffer air cavity air tightness detection device, including an air supply mechanism 1, a pressure measuring mechanism 2 and a connecting hose 3;

[0024] The gas supply mechanism 1 includes a pressure reducer 11, one end of which is used to be connected to the outlet of the nitrogen bottle 4;

[0025] The pressure measuring mechanism 2 includes an air charging joint 21, a pressure-maintaining valve 22 and an onboard pressure gauge 23. One end of the air charging joint 21 is used to be connected to the air charging port of the hydraulic buffer air cavity, one end of the pressure-maintaining valve 22 is connected to the other end of the air charging joint 21, and the onboard pressure gauge 23 is used to detect the air pressure in the air charging joint 21.

[0026] One end of the connecting hose 3 is connected to the other end of the pressure reducer 11, and the other end of the connecting hose 3 is communicated with the other end of the pressure maintaining valve 22. It should be understood that, since the pressure reducer 11 is located on the ground and the pressure maintaining valve 22 is located on the aircraft being tested during use, the connecting hose 3 should have a certain length to meet the use requirements.

[0027] When in use, connect the inflation connector 21 to the inflation port of the hydraulic buffer air cavity, connect one end of the pressure reducer 11 to the outlet of the nitrogen bottle 4, open the pressure maintaining valve 22, and the nitrogen in the nitrogen bottle 4 enters the hydraulic buffer air cavity through the pressure reducer 11, the connecting hose 3, the pressure maintaining valve 22 and the inflation connector 21. Observe the indication of the on-board pressure gauge 23. When the pressure reaches the set inflation pressure, close the pressure maintaining valve 22. The on-board personnel detect the sealing of the buffer air cavity by observing the pressure change amplitude of the on-board pressure gauge 23 within a preset time.

[0028] The hydraulic buffer air cavity air tightness detection device provided by the utility model reduces the high-pressure gas in the nitrogen bottle to a certain pressure through the pressure reducer 11, and then transmits it to the buffer air cavity, so as to prevent the buffer product from being damaged due to excessively high filling gas pressure; an on-board pressure gauge 23 is used to observe the pressure change of the buffer air cavity to detect the air tightness of the buffer air cavity. Since the on-board pressure gauge 23 is close to the buffer air cavity, the pressure detection accuracy is high; in addition, the provision of a pressure maintaining valve 22 can prevent errors in pressure detection caused by leakage of the nitrogen bottle 4.

[0029] In order to realize the connection between one end of the pressure reducer 11 and the outlet of the nitrogen bottle 4, please refer to Figure 1 In a preferred embodiment, the gas supply mechanism also includes a gas cylinder connector 12, one end of the gas cylinder connector 12 is connected to one end of the pressure reducer 11, and the other end of the gas cylinder connector 12 is used to connect to the outlet of the nitrogen cylinder 4.

[0030] To measure the pressure of a nitrogen cylinder, refer to Figure 1 In a preferred embodiment, the gas supply mechanism also includes a gas cylinder pressure gauge 13, and the gas cylinder pressure gauge 13 is used to measure the pressure of the nitrogen cylinder 4 to prevent insufficient gas pressure inside the nitrogen cylinder 4 from affecting the gas pressure filling of the hydraulic buffer.

[0031] In order to realize the installation of the gas cylinder pressure gauge 13, please refer to Figure 1 In a preferred embodiment, the gas supply mechanism 1 also includes a first connecting pipe 14, a second connecting pipe 15, and a gas supply tee 19, one end of the first connecting pipe 14 is connected to one end of the gas cylinder joint 12, the other end of the first connecting pipe 14 is connected to the first interface of the gas supply tee 19, the second interface of the gas supply tee 19 is connected to the gas cylinder pressure gauge 13, one end of the second connecting pipe 15 is connected to the third interface of the gas supply tee 19, and the other end of the second connecting pipe 15 is connected to one end of the pressure reducer 11.

[0032] To release excess gas in the pipeline, please refer to Figure 1In a preferred embodiment, the gas supply mechanism 1 further includes an exhaust valve 16, an inlet of the exhaust valve 16 is connected to the other end of the pressure reducer 11, and the exhaust valve 16 is used to release excess gas in the pipeline.

[0033] To measure the pressure of the gas after passing through the pressure reducer 11, please refer to Figure 1 In a preferred embodiment, the gas supply mechanism 1 also includes a ground pressure gauge 17, which is connected to the other end of the pressure reducer 11. The ground pressure gauge 17 is used to measure the pressure of the gas after passing through the pressure reducer 11. At the same time, the ground inflation personnel can also observe the inflation pressure based on the pressure gauge. When the inflation pressure is abnormal, the valve of the nitrogen bottle 4 can be closed in time.

[0034] To facilitate the installation of the exhaust valve 16 and the ground pressure gauge 17, please refer to Figure 1 In a preferred embodiment, the air supply mechanism 1 also includes a four-way valve 18, a first interface of the four-way valve 18 is connected to the other end of the pressure reducer 11, a second interface of the four-way valve 18 is connected to one end of the connecting hose 3, a third interface of the four-way valve 18 is connected to the inlet of the exhaust valve 16, and a fourth interface of the four-way valve 18 is connected to the ground pressure gauge 17.

[0035] In order to realize the installation of the pressure gauge 23 on the machine, please refer to Figure 1 In a preferred embodiment, the pressure measuring mechanism 2 also includes a third connecting pipe 24 and a pressure measuring tee 25, one end of the third connecting pipe 24 is connected to the other end of the inflation joint 21, the other end of the third connecting pipe 24 is connected to the first interface of the pressure measuring tee 25, the second interface of the pressure measuring tee 25 is connected to the on-board pressure gauge 23, and the third interface of the pressure measuring tee 25 is connected to one end of the pressure maintaining valve 22.

[0036] For easy portability, please refer to Figure 1 In a preferred embodiment, the first connecting tube 14, the second connecting tube 15 and the third connecting tube 24 are all hard connecting tubes, so that the entire air supply mechanism 1 can be fixed as a whole through the first connecting tube 14 and the second connecting tube 15, and the third connecting tube 24 fixes the entire pressure measuring mechanism 2 as a whole, so as to facilitate carrying.

[0037] For further convenience, please refer to Figure 1 In a preferred embodiment, the hydraulic buffer air cavity air tightness detection device also includes a suitcase, and the air supply mechanism 1, the pressure measuring mechanism 2 and the connecting hose 3 are all arranged in the suitcase.

[0038] In order to better understand the present invention, the following Figure 1The working process of the hydraulic buffer air cavity air tightness detection device provided by the utility model is described in detail:

[0039] (1) Remove the plugging cap on the hydraulic buffer charging port, close the pressure retaining valve 22, and close the exhaust valve 16;

[0040] (2) Connect the inflation connector 21 to the inflation port of the hydraulic buffer air chamber, and connect the gas cylinder connector 12 to the outlet of the nitrogen cylinder 4;

[0041] (3) Open the pressure-maintaining valve 22 to connect the inflation connector 21 to the air chamber of the buffer;

[0042] (4) Open the valve of the nitrogen cylinder 4, observe the cylinder pressure gauge 13, check whether the pressure in the nitrogen cylinder 4 meets the requirements, and observe the ground pressure gauge 17 to check whether the pressure at the outlet of the pressure reducer 11 meets the requirements. After checking that the pressure meets the requirements, open the pressure-maintaining valve 22 to inflate the hydraulic buffer air cavity;

[0043] (5) The crew on board observes the pressure gauge 23 on board. When the pressure rises to the set inflation pressure, the pressure-maintaining valve 22 is closed. The ground crew closes the valve of the nitrogen bottle 4 and then opens the exhaust valve 16 to release the excess gas in the pipeline.

[0044] (6) The onboard personnel detect the sealing of the buffer air cavity by observing the pressure change amplitude of the onboard pressure gauge 23 within a preset time;

[0045] (7) After the air tightness test is passed, disconnect the inflation joint 21, open the pressure retaining valve 22, and release the excess gas in the inflation joint 21.

[0046] The advantages of using the above-mentioned hydraulic buffer air cavity air tightness detection device are: the device is provided with a pressure reducer 11 for reducing the pressure of the nitrogen bottle 4 to the test pressure, so as to prevent overpressure during the test and ensure the safety of the product and personnel; the device is provided with an on-board pressure gauge 23 and a ground pressure gauge 17, which is convenient for reading the test pressure value and improving the accuracy of pressure detection. Ground personnel can observe the test pressure through the ground pressure gauge 17 and control the valve opening of the nitrogen bottle 4 to ensure that the inflation speed is stable and controllable; a pressure maintaining valve 22 is added to the rear end of the inflation joint 21 to isolate the buffer air cavity from the nitrogen bottle 4 during detection and ensure the accuracy of the buffer air cavity air tightness detection.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic buffer air cavity air tightness detection device, characterized in that: include: A gas supply mechanism, the gas supply mechanism comprising a pressure reducer, one end of the pressure reducer is used to be connected to the outlet of the nitrogen bottle; A pressure measuring mechanism, the pressure measuring mechanism comprising an air charging joint, a pressure-maintaining valve and an onboard pressure gauge, one end of the air charging joint being used to connect with the air charging port of the hydraulic buffer air cavity, one end of the pressure-maintaining valve being connected with the other end of the air charging joint, and the onboard pressure gauge being used to detect the air pressure in the air charging joint; as well as, A connecting hose, one end of which is connected to the other end of the pressure reducer, and the other end of which is communicated with the other end of the pressure maintaining valve.

2. The hydraulic buffer air cavity air tightness detection device according to claim 1, characterized in that: The gas supply mechanism also includes a gas cylinder connector, one end of which is connected to one end of the pressure reducer, and the other end of which is used to be connected to the outlet of the nitrogen cylinder.

3. The hydraulic buffer air cavity air tightness detection device according to claim 2, characterized in that: The gas supply mechanism also includes a gas cylinder pressure gauge, which is used to measure the pressure of the nitrogen cylinder.

4. The hydraulic buffer air cavity air tightness detection device according to claim 3, characterized in that: The gas supply mechanism also includes a first connecting pipe, a second connecting pipe, and a gas supply tee. One end of the first connecting pipe is connected to one end of the gas cylinder connector, the other end of the first connecting pipe is connected to the first interface of the gas supply tee, the second interface of the gas supply tee is connected to the gas cylinder pressure gauge, one end of the second connecting pipe is connected to the third interface of the gas supply tee, and the other end of the second connecting pipe is connected to one end of the pressure reducer.

5. The hydraulic buffer air cavity air tightness detection device according to claim 1, characterized in that: The air supply mechanism further comprises an exhaust valve, an inlet of which is connected to the other end of the pressure reducer.

6. The hydraulic buffer air cavity air tightness detection device according to claim 5, characterized in that: The gas supply mechanism also includes a ground pressure gauge, which is connected to the other end of the pressure reducer and is used to measure the pressure of the gas after passing through the pressure reducer.

7. The hydraulic buffer air cavity air tightness detection device according to claim 6, characterized in that: The air supply mechanism also includes a four-way valve, a first interface of the four-way valve is connected to the other end of the pressure reducer, a second interface of the four-way valve is connected to one end of a connecting hose, a third interface of the four-way valve is connected to the inlet of the exhaust valve, and a fourth interface of the four-way valve is connected to the ground pressure gauge.

8. The hydraulic buffer air cavity air tightness detection device according to claim 4, characterized in that: The pressure measuring mechanism also includes a third connecting pipe and a pressure measuring tee, one end of the third connecting pipe is connected to the other end of the inflation joint, the other end of the third connecting pipe is connected to the first interface of the pressure measuring tee, the second interface of the pressure measuring tee is connected to the on-board pressure gauge, and the third interface of the pressure measuring tee is connected to one end of the pressure maintaining valve.

9. The hydraulic buffer air cavity air tightness detection device according to claim 8, characterized in that: The first connecting pipe, the second connecting pipe and the third connecting pipe are all hard connecting pipes.

10. The hydraulic buffer air cavity air tightness detection device according to claim 1, characterized in that: The hydraulic buffer air cavity air tightness detection device also includes a suitcase, and the air supply mechanism, the pressure measuring mechanism and the connecting hose are all arranged in the suitcase.