A spring-loaded buffer reciprocating sealing performance test device

Abstract

The present invention discloses a spring-loaded buffer reciprocating sealing performance test device, which relates to the technical field of sealing performance test, including a reciprocating mechanism, the reciprocating mechanism includes a cylinder and a piston rod sliding vertically inside the cylinder, a sealing chamber located between the cylinder and the piston rod is arranged inside the cylinder, an annular sealing member is arranged on the upper and lower sides of the sealing chamber, a pressure sensor is arranged in the sealing chamber, and the cylinder is connected to a plurality of tension pressure sensors; an elastic component, the elastic component includes at least one elastic member, and the elastic member applies a downward elastic force to the piston rod; a buffer component, the buffer component includes a buffer located below the piston rod; and a high-temperature and high-pressure pump group, the high-temperature and high-pressure pump group includes an oil chamber, an oil pipe for conveying the oil in the oil chamber to the sealing chamber, and an oil return pipe for returning the oil in the sealing chamber to the oil chamber, and the buffer chamber is connected to the oil return pipe. The present application can test the performance of the buffer seal.

Description

Technical Field

[0001] The invention relates to the technical field of sealing performance testing, in particular to a spring-loaded buffer reciprocating sealing performance testing device. Background Art

[0002] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art. At present, the aircraft landing gear is an important component of the aircraft, and the sealing performance of its buffer directly affects the safety and performance of the aircraft. In order to develop a buffer with excellent sealing performance, it is necessary to conduct sufficient simulation tests on it. In particular, it is necessary to simulate and evaluate the performance of the buffer seal under high-speed impact conditions and pressure pulse conditions. However, existing test equipment is often unable to accurately simulate such extreme environments, thus limiting the progress of research and development work. Therefore, a reciprocating sealing performance test device is needed to improve the above-mentioned problems. Summary of the invention

[0003] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, an embodiment of the present invention provides a spring-loaded buffer reciprocating seal performance test device, which can simulate the high-speed impact condition of an aircraft and test the performance of the buffer seal.

[0004] The spring-loaded buffer reciprocating sealing performance test device according to the embodiment of the present invention comprises a reciprocating mechanism, the reciprocating mechanism comprises a cylinder and a piston rod vertically sliding inside the cylinder, a sealing chamber located between the cylinder and the piston rod is arranged inside the cylinder, an annular seal is arranged on the upper and lower sides of the sealing chamber respectively, the annular seal is located between the piston rod and the cylinder, a pressure sensor is arranged in the sealing chamber, both ends of the piston rod extend out of the cylinder, a plurality of tension and pressure sensors are connected to the cylinder, the upper ends of the tension and pressure sensors are fixedly arranged, and the lower ends of the tension and pressure sensors are connected to the cylinder; A reciprocating mechanism component, wherein the elastic component includes at least one elastic member, the upper end of which is fixedly arranged, and the lower end of which is directly or indirectly connected to the upper end of the piston rod, and the elastic member applies an elastic force downward to the piston rod; a buffer component, wherein the buffer component is located below the reciprocating mechanism, and the buffer component includes a buffer located below the piston rod, and a buffer chamber is arranged inside the buffer; and a high-temperature and high-pressure pump group, wherein the high-temperature and high-pressure pump group includes an oil chamber, an oil delivery pipe for conveying the oil in the oil chamber to the sealing chamber, and an oil return pipe for returning the oil in the sealing chamber to the oil chamber, and the buffer chamber is connected to the oil return pipe.

[0005] In an optional or preferred embodiment, the spring-loaded buffer reciprocating sealing performance test device further includes a lifting assembly to lift the piston rod. Further, the lifting assembly includes a lifting plate and a plurality of lifting cylinders, the upper end of the piston rod is fixed to the lower end surface of the lifting plate, the lower end of the elastic member is fixed to the upper end surface of the lifting plate, the lifting cylinders are distributed around the piston rod, and the driving end of the lifting cylinder is connected to the lifting plate.

[0006] In an optional or preferred embodiment, a limit block that can move laterally is provided below the lifting plate to limit the lifting plate after lifting. Further, each limit block has a limit state and a release state by moving laterally; in the limit state, the limit block is stuck at the bottom of the lifting plate; in the release state, the limit block is away from the lifting plate, and the lifting plate can move up and down.

[0007] In an optional or preferred embodiment, the cylinder is provided with an annular groove for the annular seal to be embedded in, and the inner side of the annular seal fits the piston rod to ensure the sealing of the sealing chamber.

[0008] In an optional or preferred embodiment, the elastic member is a compression spring.

[0009] In an optional or preferred embodiment, nitrogen is provided at the bottom of the buffer.

[0010] In an optional or preferred embodiment, the features are: the oil pipeline is provided with a hydraulic pump to extract the oil from the oil chamber; the oil pipeline is provided with a heating circuit to heat the oil in the oil pipeline; the oil pipeline is provided with a temperature and pressure flowmeter to monitor the temperature, pressure and flow of the oil in the oil pipeline; the oil pipeline is provided with an accumulator to reduce the pressure fluctuation of the oil in the oil pipeline; the oil pipeline is provided with an overflow branch pipe connected to the return oil pipe, and the overflow branch pipe is provided with a first overflow valve; the outlet end of the oil pipeline is provided with a first stop valve.

[0011] In an optional or preferred embodiment, the buffer chamber is connected to the oil return pipe via a connecting branch pipe, and the buffer chamber is connected to the oil return pipe via a connecting branch pipe to connect the buffer chamber with the sealing chamber; the oil return pipe is provided with a second overflow valve; and the inlet end of the oil return pipe is provided with a second stop valve.

[0012] Based on the above technical scheme, the embodiment of the present invention has at least the following beneficial effects: In the above technical scheme, the oil is transported to the sealed chamber by a high-temperature and high-pressure pump group. After the pressure and temperature of the sealed chamber in the cylinder reach the set value, the piston rod can be lifted after the lifting assembly is set, and then the piston rod is pushed downward by the elastic member to simulate the high-speed impact condition of the aircraft. After the impact, the buffer below generates a pressure pulse in the buffer oil chamber, and then the sealed oil chamber inside the cylinder is connected through the return oil pipe to simulate the pulse condition. The pressure sensor measures the pressure in the sealed oil chamber, and an annular seal is set between the piston rod and the cylinder. The value measured by the tension pressure sensor is the friction of the annular seal plus the gravity of the cylinder. After removing the gravity of the cylinder, the friction of the annular seal can be obtained. The above operation is repeated to test the performance of the buffer seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0014] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of a high-temperature and high-pressure pump group in an embodiment of the present invention.

[0016] Figure numerals: reciprocating mechanism 10, cylinder 11, piston rod 12, second stop valve 532, pressure sensor 14, annular seal 15, tension pressure sensor 16; elastic member 21; buffer assembly 30, buffer 31, buffer chamber 32, nitrogen 33; lifting assembly 40, lifting plate 41, lifting cylinder 42, limit block 43; high-temperature and high-pressure pump group 50, oil chamber 511, liquid level meter 512, oil pipeline 521, first stop valve 522, hydraulic pump 523, heating circuit 524, accumulator 525, temperature and pressure flowmeter 526, first overflow valve 527, first filter 528, return oil pipe 531, second stop valve 532, second overflow valve 533, second filter 534, connecting branch pipe 541. DETAILED DESCRIPTION

[0017] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0020] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0022] Refer to the following Figure 1 to Figure 2 , describes a spring-loaded buffer reciprocating sealing performance test device, including a reciprocating mechanism 10, an elastic component, a buffer component 30, and a high-temperature and high-pressure pump group 50.

[0023] The reciprocating mechanism 10 includes a cylinder 11 and a piston rod 12 that slides vertically inside the cylinder 11. A sealed chamber 13 located between the cylinder 11 and the piston rod 12 is provided inside the cylinder 11. Annular seals 15 are provided on the upper and lower sides of the sealed chamber 13, respectively. The annular seal 15 is located between the piston rod 12 and the cylinder 11. Further, the cylinder 11 is provided with an annular groove for the annular seal 15 to be embedded. The inner side of the annular seal fits the piston rod to ensure the sealing of the sealed chamber.

[0024] The sealed chamber 13 is provided with a pressure sensor 14, which can measure the pressure in the sealed chamber 13. The cylinder 11 is connected with a plurality of tension pressure sensors 16, the upper end of which is fixedly arranged, and the lower end of which is connected to the cylinder 11. It can be understood that the piston rod 12 slides vertically inside the cylinder 11, and there is friction between the piston rod 12 and the cylinder 11 with two annular seals 15. Therefore, the value measured by the tension pressure sensor 16 is the friction of the annular seal 15 plus the gravity of the cylinder 11. After removing the gravity of the cylinder 11, the friction of the annular seal 15 can be obtained.

[0025] The elastic component includes at least one elastic member 21, the upper end of the elastic member 21 is fixedly arranged, the lower end of the elastic member 21 is directly or indirectly connected to the upper end of the piston rod 12, and the elastic member 21 applies a downward elastic force to the piston rod 12. Specifically, the elastic member 21 is a compression spring, and after the elastic member 21 is squeezed, the elastic member 21 will apply a downward elastic force to the piston rod 12.

[0026] The buffer assembly 30 is located below the reciprocating mechanism 10, and includes a buffer 31 located below the piston rod 12, and a buffer chamber 32 is provided inside the buffer 31. Both ends of the piston rod 12 extend outside the cylinder 11, the upper end is directly or indirectly connected to the elastic member 21, and the lower end is located above the buffer 31. In this embodiment, nitrogen 33 is provided at the bottom of the buffer 31.

[0027] Combination Figure 2 The high-temperature and high-pressure pump group 50 includes an oil chamber 511, an oil delivery pipe 521 for delivering the oil in the oil chamber 511 to the sealing chamber 13, and an oil return pipe 531 for returning the oil in the sealing chamber 13 to the oil chamber 511, and the buffer chamber 32 is connected to the oil return pipe 531.

[0028] The oil delivery pipe 521 delivers the oil in the oil chamber 511 to the sealed chamber 13. The oil delivery pipe 521 is provided with a hydraulic pump 523, a one-way valve, a heating circuit 524 and a first stop valve 522 in sequence. The hydraulic pump 523 is used to extract the oil in the oil chamber 511, so as to pump the oil into the sealed chamber 13; the heating circuit 524 is used to heat the oil in the oil delivery pipe 521, and the first stop valve 522 is provided at the outlet end of the oil delivery pipe 521. The oil delivery pipe 521 is provided with a temperature and pressure flowmeter 526 to monitor the temperature, pressure and flow of the oil in the oil delivery pipe 521. The temperature and pressure flowmeter 526 is specifically provided between the heating circuit 524 and the first stop valve 522. In addition, the oil delivery pipe 521 is provided with an accumulator 525 between the heating circuit 524 and the first stop valve 522 to reduce the pressure fluctuation of the oil in the oil delivery pipe 521. The oil delivery pipe 521 is provided with an overflow branch pipe connected to the oil return pipe 531 , and the overflow branch pipe is provided with a first overflow valve 527 .

[0029] The buffer chamber 32 is connected to the oil return pipe 531 through the connecting branch pipe 541, so as to connect the buffer chamber 32 with the sealing chamber 13. The oil return pipe 531 is provided with a second overflow valve 533. The inlet end of the oil return pipe 531 is provided with a second stop valve 532, which is arranged in the pipe section between the second overflow valve 533 of the oil return pipe 531 and the connecting branch pipe 541.

[0030] One end of the overflow branch pipe is connected to the pipe section between the one-way valve and the heating circuit 524 of the oil delivery pipe 521, and the other end of the overflow branch pipe is connected to the pipe section after the second overflow valve 533 of the oil return pipe 531. It can be understood that after closing the first stop valve 522, the oil in the oil delivery pipe 521 can flow from the overflow branch pipe to the oil return pipe 531.

[0031] As a preferred solution of the present invention, the oil chamber 511 is provided with a liquid level meter 512 , the oil suction port of the oil delivery pipe 521 is provided with a first filter 528 , and the oil outlet of the oil return pipe 531 is provided with a second filter 534 .

[0032] In this embodiment, the spring-loaded buffer reciprocating sealing performance test device further includes a lifting assembly 40 to lift the piston rod 12. Specifically, the lifting assembly 40 includes a lifting plate 41 and a plurality of lifting cylinders 42, the upper end of the piston rod 12 is fixed to the lower end surface of the lifting plate 41, the lower end of the elastic member 21 is fixed to the upper end surface of the lifting plate 41, the lifting cylinders 42 are distributed on the outer periphery of the piston rod 12, and the driving end of the lifting cylinder 42 is connected to the lifting plate 41.

[0033] In addition, a limit block 43 that can move laterally is provided below the lifting plate 41 to limit the lifting plate 41 after lifting. Each limit block 43 has a limit state and a release state by moving laterally; in the limit state, the limit block 43 is stuck at the bottom of the lifting plate 41; in the release state, the limit block 43 is away from the lifting plate 41, and the lifting plate 41 can move up and down. The limit block 43 is driven by a hydraulic cylinder in this embodiment, which is not shown in the figure. In other embodiments, the limit block 43 can also be driven laterally by a motor in conjunction with a transmission mechanism. The lateral drive of the limit block 43 can be achieved by a structure well known to those skilled in the art.

[0034] In the release state, the lifting cylinder 42 is actuated to push the lifting plate 41 upward, and drives the piston rod 12 to move upward, while squeezing the elastic member 21. After squeezing to the set position, the hydraulic cylinder pushes the limit block 43 to extend. Figure 1 In the position state shown, at this time, the limit block 43 is stuck at the bottom of the lifting plate 41, the lifting plate 41 cannot move downward, and the elastic member 21 is in a compressed state, which is the limit state of the limit block 43. Then the lifting cylinder 42 is retracted, and the elastic member 21 pushes the piston rod 12 to impact downward, simulating the high-speed impact condition of the aircraft, and after the impact, the buffer 31 below is generated, and a pressure pulse is generated in the buffer oil chamber 32, which is connected to the inside of the cylinder 11 through the connecting branch pipe 541 to simulate the pulse condition.

[0035] The pressure sensor measures the pressure in the sealed oil chamber. An annular seal is set between the piston rod and the cylinder. The value measured by the tension pressure sensor is the friction force of the annular seal plus the gravity of the cylinder. The friction force of the annular seal can be obtained after removing the gravity of the cylinder. The above operation is repeated to test the performance of the buffer seal.

[0036] Working principle: When in use, the hydraulic pump 523 pumps the oil in the oil chamber 511 through the first filter 528, then heats it through the heating circuit 524, and then sends it into the sealed chamber 13. During this period, the temperature, pressure and flow-related parameters of the oil in the oil pipe 521 can be monitored by the temperature and pressure flowmeter 526. When the specified pressure is reached, the first overflow valve 527 opens, and the oil pumped out by the hydraulic pump 523 directly returns to the oil cylinder through the first overflow valve 527 to avoid excessive pressure.

[0037] After reaching the specified pressure, the first stop valve 522 and the second stop valve 532 are closed, and the pressure of the second stop valve 532 is maintained. Then, the lifting cylinder 42 is actuated to push the lifting plate 41 up, and drive the piston rod 12 to move upward, while squeezing the elastic member 21. After squeezing to the set position, the hydraulic cylinder pushes the limit block 43 to extend, and then retracts the lifting cylinder 42. After the lifting cylinder 42 is reset, the limit block 43 is released, and the elastic member 21 pushes the piston rod 12 to impact downward, simulating the high-speed impact condition of the aircraft. After the impact, a pressure pulse is generated in the buffer 31 below and in the buffer oil chamber 32, which is connected to the inside of the cylinder 11 through the connecting branch pipe 541 to simulate the pulse condition.

[0038] The pressure in the sealed chamber 13 is measured by the pressure sensor 14. An annular seal is set between the piston rod and the cylinder. The value measured by the tension pressure sensor 16 is the friction force of the annular seal 15 plus the gravity of the cylinder 11. After removing the gravity of the cylinder 11, the friction force of the annular seal 15 can be obtained. The above operation is repeated to test the performance of the buffer seal.

[0039] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A spring-loaded buffer reciprocating sealing performance test device, characterized in that: include A reciprocating mechanism, the reciprocating mechanism comprises a cylinder and a piston rod which slides vertically inside the cylinder, a sealed chamber located between the cylinder and the piston rod is arranged inside the cylinder, an annular seal is arranged on the upper side and the lower side of the sealed chamber respectively, the annular seal is located between the piston rod and the cylinder, a pressure sensor is arranged in the sealed chamber, both ends of the piston rod extend out of the cylinder, a plurality of tension and pressure sensors are connected to the cylinder, the upper end of the tension and pressure sensor is fixedly arranged, and the lower end of the tension and pressure sensor is connected to the cylinder; An elastic component, the elastic component comprising at least one elastic member, the upper end of the elastic member is fixedly arranged, the lower end of the elastic member is directly or indirectly connected to the upper end of the piston rod, and the elastic member applies a downward elastic force to the piston rod; a buffer assembly, the buffer assembly being located below the reciprocating mechanism, the buffer assembly comprising a buffer located below the piston rod, a buffer chamber being disposed inside the buffer; and A high-temperature and high-pressure pump group, which includes an oil chamber, an oil delivery pipe for delivering the oil in the oil chamber to the sealing chamber, and an oil return pipe for returning the oil in the sealing chamber to the oil chamber, and the buffer chamber is connected to the oil return pipe.

2. The spring-loaded buffer reciprocating sealing performance test device according to claim 1, characterized in that: The spring-loaded buffer reciprocating sealing performance testing device also includes a lifting assembly to lift the piston rod.

3. The spring-loaded buffer reciprocating sealing performance test device according to claim 2, characterized in that: The lifting assembly includes a lifting plate and multiple lifting cylinders, the upper end of the piston rod is fixed to the lower end surface of the lifting plate, the lower end of the elastic member is fixed to the upper end surface of the lifting plate, the lifting cylinders are distributed on the periphery of the piston rod, and the driving end of the lifting cylinders is connected to the lifting plate.

4. The spring-loaded buffer reciprocating sealing performance test device according to claim 3, characterized in that: A laterally movable limiting block is provided below the lifting plate to limit the lifting plate after lifting.

5. The spring-loaded buffer reciprocating sealing performance test device according to claim 4, characterized in that: Each of the limit blocks has a limit state and a release state by lateral movement; in the limit state, the limit block is stuck at the bottom of the lifting plate; in the release state, the limit block is away from the lifting plate, and the lifting plate can move up and down.

6. The spring-loaded buffer reciprocating sealing performance test device according to claim 1, characterized in that: The cylinder body is provided with an annular groove for the annular seal to be embedded in, and the inner side of the annular seal fits the piston rod to ensure the sealing performance of the sealing chamber.

7. The spring-loaded buffer reciprocating sealing performance test device according to claim 1, characterized in that: The elastic member is a compression spring.

8. The spring-loaded buffer reciprocating sealing performance test device according to claim 1, characterized in that: The bottom of the buffer is provided with nitrogen.

9. The spring-loaded buffer reciprocating sealing performance test device according to any one of claims 1 to 7, characterized in that: The oil pipeline is provided with a hydraulic pump to extract the oil from the oil chamber; the oil pipeline is provided with a heating circuit to heat the oil in the oil pipeline; the oil pipeline is provided with a temperature and pressure flowmeter to monitor the temperature, pressure and flow of the oil in the oil pipeline; the oil pipeline is provided with an accumulator to reduce the pressure fluctuation of the oil in the oil pipeline; the oil pipeline is provided with an overflow branch pipe connected to the return oil pipe, and the overflow branch pipe is provided with a first overflow valve; the outlet end of the oil pipeline is provided with a first stop valve.

10. The spring-loaded buffer reciprocating sealing performance test device according to claim 8, characterized in that: The buffer chamber is connected to the oil return pipe through a connecting branch pipe to connect the buffer chamber with the sealing chamber; the oil return pipe is provided with a second overflow valve; and the inlet end of the oil return pipe is provided with a second stop valve.

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