Air pressure detection structure for damper

Abstract

The utility model discloses an air pressure detection structure for a damper, which relates to the field of hydraulic pneumatic equipment and comprises a damper body component and an inflation valve component, and the inflation valve component is connected to one end of the damper body component and seals a high-pressure air cavity. The other side of the inflation valve assembly is connected with a piezoresistive element core through a locking cap, and the piezoresistive element core is connected with an external pressure detector. According to the air pressure detection structure for the damper and the using method thereof, the size is small, the weight is light, the anti-electromagnetic interference capacity is high, the detection output end is arranged, rapid performance detection under the installation state is achieved, the maintenance efficiency of an aviation hydraulic system is greatly improved, the maintenance cost is reduced, and the system reliability is improved.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic and pneumatic equipment, in particular to a pneumatic pressure detection structure for a damper. Background Art

[0002] Aviation hydraulic systems have the working characteristics of high pressure and high rotational speed, which also bring high-frequency, variable-frequency, and high-pressure pressure pulsations. Such high-frequency, variable-frequency, and high-pressure pressure pulsations will be transmitted to various pipelines and components of the hydraulic system along with the flow of the hydraulic medium, and even resonance will occur at the blind ends of individual pipelines, further amplifying the amplitude of the pressure pulsations, affecting the working stability of the hydraulic system, and in severe cases causing structural damage and affecting flight safety. To solve this problem, dampers are often used to absorb and reduce the pressure pulsation value of the system. To meet the requirements of components supporting the aviation system, such as light weight, small volume, high strength, and strong anti-electromagnetic interference ability. The damper is made relatively compact in structure. After filling high-pressure gas into the damper, the high-pressure gas chamber is closed.

[0003] As Figure 4 shown, it is the structure of an existing damper. One end of the damper body assembly 1 is connected with an air filling valve assembly 2 and is locked and positioned through a lock washer 3 and a valve cap 4. When the air filling valve assembly 2 is inflated, the valve cap 4 needs to be removed, and high-pressure nitrogen is filled into its high-pressure gas chamber through a special air filling device. After inflation, the valve cap 4 is reassembled. If the internal air pressure needs to be detected, the valve cap 4 can be removed and a pressure gauge or other pressure detection instrument can be connected. At this time, the gas inside the damper will flow into the detection instrument. Since the volume of the internal gas chamber of the damper is very small, even a tiny gas loss will cause insufficient internal air pressure. Therefore, the damper with this structure cannot directly detect the internal pressure of the gas chamber and can only be checked on a special test device after being removed, or inflated again after the detection, which cannot meet the requirements of rapid maintenance of the aircraft. If a pneumatic pressure sensor is directly installed on the damper, first, it will cause a sharp increase in the weight and length of the damper, unable to meet the requirements of lightweight and miniaturization of the components of the aviation system; second, installing the sensor will cause the overall cantilever beam structure of the damper to be too long and the vibration to intensify, and it will be damaged under high-frequency vibration; third, the internal circuit of the sensor is severely affected by electromagnetic interference and cannot meet the requirements of electromagnetic compatibility.

[0004] To solve this problem, a pneumatic pressure detection structure for a damper has been developed. This structure can quickly and effectively detect the internal air pressure of the damper without losing the internal air pressure, and can quickly and conveniently realize the on-board performance detection in the installed state, greatly improving the maintenance efficiency and greatly reducing the maintenance cost. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pneumatic pressure detection structure for a damper, which solves the problems of complex pressure detection and long time consumption of the existing damper technology.

[0006] To solve the above technical problems, the following technical solutions are adopted in the present utility model:

[0007] A pneumatic detection structure for a damper in the present utility model includes a piezoresistive element core and a pressure detector. The piezoresistive element core is connected to one side of the inflation valve assembly and is locked and positioned by a locking cap. The piezoresistive element core is connected to the external pressure detector through a data cable; the other side of the inflation valve assembly is connected to the damper body assembly and forms a seal for the high-pressure air chamber.

[0008] Preferably, the inflation valve assembly includes a valve core, a valve body, a spring seat and a return spring. The valve core is movably installed in the central hole of the valve body. The large-end plane of the valve core is located on one side of the high-pressure air chamber. The largest outer circle of the valve body is connected inside the end cover of the damper body assembly. The return spring is sleeved on the valve core, and both ends of the return spring abut against the opposite surfaces of the spring seat and the nut. The nut is screwed and connected to the outer peripheral surface of the valve core; the inner end of the piezoresistive element core is embedded into the central hole of the valve body and contacts the outer end surface of the valve core.

[0009] Preferably, a sealing ring is provided between the outer peripheral surface of a step near the inner side of the piezoresistive element core and the inner wall of the valve body. External threads are provided on the outer side wall of the valve body. The central hole of the locking cap is provided as a stepped hole. The large-hole end is provided with internal threads and matches the external threads of the valve body. The small-hole end is located on the outside and is sleeved on the outermost step of the piezoresistive element core.

[0010] Preferably, the piezoresistive element core is provided as a multi-step cylinder, including an integrally structured first step, second step, third step, fourth step and fifth step. The first step, second step, third step, fourth step and fifth step are arranged in sequence from the inside to the outside, and the diameters of the first step, second step, third step and fourth step gradually increase. The diameter of the fifth step is the same as that of the second step;

[0011] The outer diameter of the second step matches the inner hole diameter of the valve body. The third step abuts against the end face of the valve body. The fourth step has a clearance fit with the bottom of the large hole of the locking cap, and the end face of the fourth step abuts against the stepped surface of the large hole. The fifth step passes through the small hole of the locking cap.

[0012] Preferably, the inner side surface of the large end of the valve core is provided as a one-way valve core sealing spherical surface, and the inner side surface of the central hole of the valve body is provided as a one-way valve body sealing conical surface. The one-way valve body sealing conical surface and the one-way valve core sealing spherical surface contact or move away from each other during use.

[0013] Preferably, a piezoresistive element, a temperature sensing element and a compensation circuit are arranged inside the piezoresistive element core; the pressure detector is equipped with a data cable, and the piezoresistive element core detects the internal air pressure and temperature of the high-pressure air chamber and transmits them to the pressure detector through the data cable.

[0014] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0015] The present utility model is a pneumatic pressure detection structure for a damper and its usage method, which is small in size, light in weight, strong in anti-electromagnetic interference ability, and is equipped with a detection output terminal, realizing rapid performance detection in the installed state, greatly improving the maintenance efficiency of the aviation hydraulic system, reducing the maintenance cost, and improving the system reliability; at the same time, since the correspondence relationship between the pressure values and temperature values of dampers of different specifications and models can be set inside the detector, the detector can also determine whether the internal pressure of the damper meets the requirements while detecting the pressure and temperature, realizing the function of automatically judging faults; in addition, since there are only piezoresistive elements and a small amount of compensation circuits inside the piezoresistive element core, the environmental adaptability is better, and it can adapt to the working environment of -55°C to 200°C. Therefore, this pneumatic pressure detection structure has strong innovation and practicability, and has achieved good results in practical applications. Description of the Drawings

[0016] The following further describes the present utility model with reference to the accompanying drawings.

[0017] Figure 1 Schematic diagram of the pneumatic pressure detection structure for the damper of the present utility model;

[0018] Figure 2 Schematic diagram of the inflation valve assembly structure of the present utility model (valve core open state);

[0019] Figure 3 Schematic diagram of the inflation valve assembly structure of the present utility model (valve core closed state);

[0020] Figure 4 Schematic diagram of the structure of the existing damper;

[0021] Figure 5 Length comparison diagram between a specific embodiment of the present utility model and the existing damper;

[0022] Description of the reference numerals: 1. Damper body assembly; 2. Inflation valve assembly; 3. Lock washer; 4. Valve cap; 5. Sealing ring; 6. Locking cap; 7. Piezoresistive element core; 8. Pressure detector; 9. One-way valve core sealing spherical surface; 10. One-way valve body sealing conical surface;

[0023] 2-1. Valve core; 2-2. Valve body; 2-3. Spring seat; 2-4. Return spring; 2-5. Nut;

[0024] 7-1, First step; 7-2, Second step; 7-3, Third step; 7-4, Fourth step; 7-5, Fifth step. Detailed implementation mode

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0027] As Figures 1-4 shown, a pneumatic detection structure for a damper includes a piezoresistive element core 7 and a pressure detector 8. The piezoresistive element core 7 is connected to one side of the inflation valve assembly 2 and locked and positioned by a locking cap 6. The piezoresistive element core 7 is connected to the external pressure detector 8 through a data line. The other side of the inflation valve assembly 2 is connected to the damper body assembly 1 and seals the high-pressure air chamber.

[0028] As Figure 2 shown, the inflation valve assembly 2 includes a valve core 2-1, a valve body 2-2, a spring seat 2-3 and a return spring 2-4. The valve core 2-1 is movably installed in the central hole of the valve body 2-2. The large-end plane of the valve core 2-1 is located on the side of the high-pressure air chamber. The maximum outer circle of the valve body 2-2 is connected to the end cover of the damper body assembly 1. The return spring 2-4 is sleeved on the valve core 2-1, and both ends of the return spring 2-4 abut against the opposite surfaces of the spring seat 2-3 and the nut 2-5. The nut 2-5 is screwed and connected to the outer peripheral surface of the valve core 2-1. The inner end of the piezoresistive element core 7 is embedded in the central hole of the valve body 2-2 and contacts the outer end surface of the valve core 2-1.

[0029] Specifically, a sealing ring 5 is arranged between the outer peripheral surface of a step closer to the inner side of the piezoresistive element core body 7 and the inner wall of the valve body 2-2. An external thread is provided on the outer side wall of the valve body 2-2. The central hole of the locking cap 6 is arranged as a stepped hole. The large-hole end is provided with an internal thread and matches the external thread of the valve body 2-2. The small-hole end is located on the outer side and is sleeved on the outermost step of the piezoresistive element core body 7.

[0030] As Figure 3 shown, the piezoresistive element core body 7 is arranged as a multi-stepped cylinder, including an integrally structured first step 7-1, second step 7-2, third step 7-3, fourth step 7-4, and fifth step 7-5. The first step 7-1, second step 7-2, third step 7-3, fourth step 7-4, and fifth step 7-5 are arranged in sequence from the inside to the outside. The diameters of the first step 7-1, second step 7-2, third step 7-3, and fourth step 7-4 gradually increase, and the diameter of the fifth step 7-5 is the same as that of the second step 7-2. Among them, the outer diameter of the second step 7-2 matches the inner hole diameter of the valve body 2-2. The third step 7-3 abuts against the end face of the valve body 2-2. The fourth step 7-4 has a clearance fit with the bottom of the large hole of the locking cap 6, and the end face of the fourth step 7-4 abuts against the stepped surface of the large hole. The fifth step 7-5 penetrates out of the small hole of the locking cap 6. Specifically, the detachable positioning is realized by the cooperation of the multi-stepped cylinder and the outer locking cap, and the assembly and use are convenient and fast.

[0031] Specifically, the inner side of the large end of the valve core 2-1 is arranged as a one-way valve core sealing spherical surface 9, and the inner side of the central hole of the valve body 2-2 is arranged as a one-way valve body sealing conical surface 10. The one-way valve body sealing conical surface 10 and the one-way valve core sealing spherical surface 9 are in contact with or away from each other during use.

[0032] Specifically, a piezoresistive element, a temperature sensing element, and a compensation circuit are arranged inside the piezoresistive element core body 7. The pressure detector 8 comes with a data cable. The piezoresistive element core body 7 detects the internal air pressure and temperature of the high-pressure air chamber and transmits them to the pressure detector 8 through the data cable.

[0033] As Figure 5 shown, compared with the existing damper, the overall structure size of the air pressure detection structure for the damper changes little, only the length is partially extended; the overall structure is compact and the volume is small.

[0034] The use process of the present utility model specifically includes the following steps:

[0035] Step 1, inflation:

[0036] First, assemble and connect the damper body assembly 1 and the inflation valve assembly 2 together;

[0037] Then, use a special inflation device to fill a certain pressure of gas into the high-pressure gas chamber of the damper body assembly 1 through the inflation valve assembly 2: During inflation, the ejector pin of the inflation device pushes open the valve core 2-1 of the inflation valve assembly 2, and the sealing surface between the valve core 2-1 and the valve body 2-2 is separated, and the gas enters the damper; After inflation, retract the ejector pin of the inflation device, and the valve core 2-1 retracts and closes the valve port under the restoring force of the return spring 2-4, and the high-pressure air is sealed in the high-pressure gas chamber;

[0038] Finally, remove the inflation device;

[0039] Step 2, install the piezoresistive element core:

[0040] Install the sealing ring 5 into the sealing groove of the piezoresistive element core 7, and then install the piezoresistive element core 7 on the inflation valve assembly 2 so that the outer spherical surface of the piezoresistive element core 7 contacts the inner conical surface of the valve body 2-2; Then install the lock nut 6, and the internal thread of the lock nut 6 is screwed onto the external thread of the valve body 2-2, and at the same time, the outer spherical surface of the piezoresistive element core 7 is pressed tightly against the inner conical surface of the valve body 2-2;

[0041] Step 3, internal air pressure detection:

[0042] After the piezoresistive element core 7 and the lock nut 6 are installed, the valve core 2-1 and the valve body 2-2 are in an open state, the piezoresistive element core 7 is connected to the high-pressure gas chamber, the pressure detector 8 senses the internal air pressure, and records and displays the detected data accordingly.

[0043] Specifically, during the installation process of the piezoresistive element core 7, the sealing ring 5 on the piezoresistive element core 7 first enters the central hole of the valve body 2-2 to achieve sealing; As the piezoresistive element core 7 continues to move inward, the end surface of the first step 7-1 at the top of the piezoresistive element core 7 contacts the end surface of the valve core 2-1 and pushes it open to open the inflation valve port. Due to the function of the sealing ring 5, the high-pressure gas inside the high-pressure gas chamber will not leak to the outside.

[0044] Specifically, a piezoresistive element, a temperature sensing element and a compensation circuit are arranged inside the piezoresistive element core 7 to realize temperature detection; The pressure detector 8 comes with a data cable, which is connected to the piezoresistive element core 7 through the data cable during use, measures the internal air pressure and temperature of the high-pressure gas chamber of the damper through signal conversion, and displays the air pressure value and temperature value. At the same time, the detector automatically judges whether the air pressure in the high-pressure gas chamber meets the requirements through the internal program setting.

[0045] In order to reduce the overall volume of the piezoresistive element, lighten the weight, improve its environmental adaptability, and sense the ambient temperature at the same time, in the present utility model, instead of using a traditional piezoresistive element, a piezoresistive element core structure with a built-in temperature sensing element is adopted. A piezoresistive element, a temperature sensing element, and a compensation circuit are arranged inside the piezoresistive element core. Therefore, the piezoresistive element can be made very small. The conversion signal and amplification circuit part for reading the value of the piezoresistive element are all integrated on the pressure detector 8. The pressure detector has a built-in battery and is electrically connected to the piezoresistive element through a data cable, which can supply power to the piezoresistive element, read the air pressure value and display it at the same time, realizing the function of detecting the internal air pressure and temperature of the high-pressure air chamber. Since the inside of the damper is a high-pressure sealed space, the gas pressure will change with the ambient temperature. Therefore, while detecting the air pressure, the piezoresistive element also detects the temperature of the air chamber. Then, the corresponding relationship between the temperature of dampers of different specifications and models and the air chamber pressure is set inside the detector. When the detector measures the pressure and temperature, it can also determine whether the air pressure of this type of damper meets the requirements at this temperature. This part of the detection and judgment belongs to the computer program part, which can be realized by using existing programming techniques in cooperation with hardware, and will not be elaborated here.

[0046] When the aircraft is operating normally, the pressure detector 8 and the data cable are not connected to the piezoresistive element, so the external dimensions and weight change greatly. When the host is undergoing routine maintenance, connecting the pressure detector 8 to the piezoresistive element through the data cable can conveniently and quickly detect the internal air pressure of the damper.

[0047] In addition, according to actual needs, the signal of the piezoresistive element can be directly connected to the host control system through the data cable to achieve on-machine detection.

[0048] Generally speaking, the present utility model is a pneumatic pressure detection structure for a damper. When using this pneumatic pressure detection structure, it is assembled to the damper. The piezoresistive element and the detection output end are not affected by electromagnetic interference, realizing rapid performance detection in the installed state, greatly improving the maintenance efficiency of the aviation hydraulic system, reducing the maintenance cost, and improving the reliability of the system.

[0049] The embodiments described above are only used to describe the preferred mode of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A gas pressure detection structure for a damper, characterized in that: The invention comprises a piezoresistive element core (7) and a pressure detector (8), wherein the piezoresistive element core (7) is connected to one side of an inflation valve assembly (2) and is locked in place by a locking cap (6), and the piezoresistive element core (7) is connected to an external pressure detector (8) via a data line; the other side of the inflation valve assembly (2) is connected to a damper body assembly (1) and forms a seal with respect to a high-pressure air cavity.

2. The air pressure detection structure for a damper according to claim 1, characterized in that: The inflation valve assembly (2) comprises a valve core (2-1), a valve body (2-2), a spring seat (2-3) and a return spring (2-4); the valve core (2-1) is movably mounted in a central hole of the valve body (2-2); a large end plane of the valve core (2-1) is located on one side of the high-pressure air chamber; the largest outer circle of the valve body (2-2) is connected to an end cover of the damper body assembly (1); the return spring (2-4) is sleeved on the valve core (2-1), and two ends of the return spring (2-4) abut against opposite surfaces of the spring seat (2-3) and a nut (2-5); and the nut (2-5) is screwed and connected to the outer peripheral surface of the valve core (2-1); The inner end of the piezoresistive element core (7) is embedded in the central hole of the valve body (2-2) and contacts the outer end surface of the valve core (2-1).

3. The air pressure detection structure for a damper according to claim 2, characterized in that: A sealing ring (5) is arranged between a stepped outer peripheral surface close to the inner side of the piezoresistive element core (7) and the inner wall of the valve body (2-2); an external thread is provided on the outer wall of the valve body (2-2); the center hole of the locking cap (6) is arranged as a stepped hole; one end of the large hole is arranged as an internal thread and matches the external thread of the valve body (2-2); one end of the small hole is located on the outside and is mounted on the outermost step of the piezoresistive element core (7).

4. The air pressure detection structure for a damper according to claim 3, characterized in that: The piezoresistive element core (7) is configured as a multi-step column, comprising a first step (7-1), a second step (7-2), a third step (7-3), a fourth step (7-4) and a fifth step (7-5) of an integrated structure, wherein the first step (7-1), the second step (7-2), the third step (7-3), the fourth step (7-4) and the fifth step (7-5) are arranged in sequence from the inside to the outside, and the diameters of the first step (7-1), the second step (7-2), the third step (7-3) and the fourth step (7-4) gradually increase, and the diameter of the fifth step (7-5) is consistent with the diameter of the second step (7-2); The outer diameter of the second step (7-2) matches the inner hole diameter of the valve body (2-2), the third step (7-3) abuts against the end face of the valve body (2-2), the fourth step (7-4) is clearance-matched with the bottom of the large hole of the locking cap (6), the end face of the fourth step (7-4) abuts against the step surface of the large hole, and the fifth step (7-5) passes through the small hole of the locking cap (6).

5. The air pressure detection structure for a damper according to claim 4, characterized in that: The inner side surface of the large end of the valve core (2-1) is arranged as a one-way valve core sealing spherical surface (9), and the inner side surface of the central hole of the valve body (2-2) is arranged as a one-way valve body sealing conical surface (10). When in use, the one-way valve body sealing conical surface (10) and the one-way valve core sealing spherical surface (9) are in contact with or away from each other.

6. The air pressure detection structure for a damper according to claim 1, characterized in that: The piezoresistive element core (7) is provided with a piezoresistive element, a temperature sensing element and a compensation circuit; the pressure detector (8) has its own data line, and the piezoresistive element core (7) detects the air pressure and temperature inside the high-pressure air cavity, and transmits the data to the pressure detector (8) via the data line.

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