Floating support mechanism for thrust adapter and thrust adapter test method

Abstract

The present invention discloses a floating support mechanism for a thrust adapter and a thrust adapter test method. The floating support mechanism includes a first test piece and a second test piece. An end face B of the first test piece contacts an end face C of the second test piece through a lubricating fluid, and an end face sealing ring is provided between end face B and end face C to prevent the lubricating fluid from overflowing therebetween. The test method includes: S1, installing the thrust adapter and the floating support mechanism; S2, exhausting air; S3, applying an axial load to the thrust adapter to collect its load bearing capacity; and applying a radial load to the floating thrust plate and the first test piece at the same time to collect the friction force of the floating thrust plate. The present invention uses a floating support mechanism to float and position a floating thrust plate that is in a floating state and is independent of the piston rod, thereby providing a floating support with as little friction force as possible for the floating thrust plate, facilitating testing of the floating thrust adapter and ensuring the accuracy and high precision of relevant test data.

Description

Technical Field

[0001] The present invention relates to the field of rocket technology, in particular to a floating support mechanism for a thrust adapter and a thrust adapter test method. Background Art

[0002] Ground-based ignition tests of rocket engines are used to test a rocket engine's transient thrust, combustion chamber pressure, and other important parameters. As one of the primary methods for evaluating rocket engine performance and improving design, ground-based ignition tests are of great significance to the inspection of rocket engine products and the development of new models. To facilitate engine performance evaluation, a variety of thrust adapters have been designed. Among these, the floating thrust adapter, which has low friction and is convenient for engine performance testing, is the primary adapter used for engine performance evaluation. The floating thrust adapter uses fluid to form a floating thrust plate that can match axial loads and move radially. However, before using the floating thrust adapter for engine performance evaluation, the performance of the thrust adapter itself must first be tested to ensure that its relevant performance meets the requirements for rocket engine performance evaluation.

[0003] One of the current purposes of testing floating thrust adapters is to measure the friction coefficient of the floating thrust plate when the adapter is under a preset load. Prior art CN210400854U discloses a buoyant thrust adapter, one end of which is fixed to a thrust wall, and the other end forms a floating thrust plate that floats upward through fluid contact. In this prior art, since one end of the floating thrust plate acts as a piston rod and is mounted within the inner cavity of a connecting member of the cylinder, the floating thrust plate is supported by the piston rod and can be suspended, allowing direct measurement of the friction between the piston rod and the inner cavity. However, in an improved solution to this problem, the floating thrust plate and the piston rod are separated into two independent components, resulting in the floating thrust plate being suspended at the extended end of the piston rod. If one side of the floating thrust plate is in floating contact with the piston rod, while the other side is in direct contact with a fixed component, each measurement only measures the friction coefficient of both sides of the floating thrust plate, and the friction coefficient of the floating end of the floating thrust plate cannot be measured. Summary of the Invention

[0004] The purpose of the present invention is to provide a floating support mechanism for a thrust adapter and a thrust adapter test method, which solves the need for measuring the friction coefficient of a floating thrust plate more accurately for a thrust adapter in which a floating thrust plate and a piston rod are independent of each other.

[0005] The technical solution adopted in the present invention is as follows:

[0006] A floating support mechanism for a thrust adapter includes a first test piece and a second test piece. An end face B of the first test piece contacts an end face C of the second test piece through a lubricating fluid, and an end face sealing ring is provided between the end faces B and C to prevent the lubricating fluid from overflowing.

[0007] Furthermore, the second test piece is provided with an exhaust channel for connecting the space sealed by the inner ring of the end face sealing ring with the outside world, and a sealing plug is provided at one end of the exhaust channel connected to the outside world to block the end thereof.

[0008] Furthermore, one end of the exhaust duct is communicated with the plate surface A, and the other end thereof is communicated with the circumferential surface of the second test piece.

[0009] Furthermore, the exhaust channel includes an axial channel and a radial channel connected in sequence, and one end of the axial channel away from the radial channel is connected to the space sealed by the inner ring of the end face sealing ring, and the other end of the radial channel away from the axial channel is connected to the circumferential surface of the second test piece.

[0010] Furthermore, the outer circumferential surfaces of the first and second specimens, on one side away from each other, are both convex to form an outward-turned edge, and bolt holes are provided on the outward-turned edge, which are coaxial with each other and whose axes are perpendicular to the end face B. The end of the rod of the guide bolt passes through the bolt hole on the outward-turned edge of the second specimen and then exits from the bolt hole on the outward-turned edge of the first specimen.

[0011] Furthermore, an axial pressure sensor assembly is installed on the side of the second specimen away from the first specimen, and the axial pressure sensor assembly includes a pressure sensor and two plate assemblies respectively connected to the two sides of the pressure sensor, and the plate assembly includes a transition plate and a sensor connecting plate connected in sequence, the sensor connecting plate is connected to the pressure sensor, and one of the transition plates is connected to the second specimen, and one of the sensor connecting plates is connected to the pressure sensor acquisition end.

[0012] Furthermore, the transition plate is a frustum structure, and its small diameter end is connected to the sensor connecting plate.

[0013] Furthermore, there are three end face sealing rings, which are, from inside to outside, a first end face sealing ring, a second end face sealing ring and a third end face sealing ring.

[0014] Furthermore, the end face sealing ring is an end face Gly ring.

[0015] A thrust adapter testing method, the thrust adapter comprising a floating thrust plate and a support assembly for radially and axially floating support thereof, the support assembly comprising a single plunger cylinder, wherein an end face A of a piston rod of the single plunger cylinder extending out of an oil chamber of a cylinder barrel of the single plunger cylinder contacts a side plate face A of the floating thrust plate via a lubricating fluid, and an end face sealing ring A is disposed between the end face A and the plate face A to prevent leakage of the lubricating fluid therebetween; an exhaust duct A is disposed on the floating thrust plate to connect a space sealed by an inner ring of the end face sealing ring A with the outside world, and a sealing plug A is disposed at one end of the exhaust duct A that connects the end thereof with the outside world;

[0016] The test method comprises the following steps:

[0017] S1. Install the thrust adapter in the test load frame, with the bottom of the cylinder fixed to one side of the load hole of the load frame;

[0018] S2. Install the floating support mechanism in the load-bearing frame. Connect the side of the second specimen away from the first specimen to the other side of the load-bearing hole of the load-bearing frame via the axial pressure sensor assembly, and ensure that the floating thrust plate is in contact with the first specimen.

[0019] S3, exhaust: supply oil to the single plunger cylinder to extend the piston rod, thereby increasing the axial extrusion force between the piston rod and the floating thrust plate, and then exhausting the gas between end surface A and plate surface A through exhaust channel A, and the gas between end surface B and end surface C through exhaust channel;

[0020] S4, then use the sealing plug A to seal the end of the exhaust duct A connected to the outside world, and use the sealing plug A to seal the end of the exhaust duct A connected to the outside world;

[0021] S5. Apply an axial load to the thrust adapter to collect its load bearing capacity; apply a radial load to the floating thrust plate and the first test piece at the same time to collect the friction force of the floating thrust plate.

[0022] Due to the adoption of this technical solution, the beneficial effects of the present invention are:

[0023] 1. The present invention provides a floating support mechanism and thrust adapter testing method for a thrust adapter. The floating support mechanism provides a floating positioning for a floating thrust plate that is in a floating state and independent of the piston rod, thereby providing a floating support with minimal friction for the floating thrust plate. This facilitates testing of the floating thrust adapter and ensures the accuracy and precision of relevant test data.

[0024] 2. The present invention relates to a floating support mechanism for a thrust adapter and a thrust adapter testing method. Because the end of the thrust adapter's floating thrust plate, remote from the piston rod, serves as the connection for subsequent rocket engine testing, this end needs to be protected to ensure the accuracy of rocket engine test data. Therefore, floating contact is achieved between the first test piece and the second test piece, thereby preventing this end from wear, contamination by lubricating fluid, and other adverse conditions. This ensures smooth subsequent engine testing and high-precision data collection.

[0025] 3. The floating support mechanism and thrust adapter test method of the present invention press the first test piece against the second test piece, and then discharge the gas between the end face B and the end face C through the exhaust duct, thereby reducing or even eliminating the gas between the end face B and the end face C, and then reducing the friction between the end face B and the end face C, so as to facilitate the collection of various parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the proportional relationships of the various components in the drawings of this specification do not represent the proportional relationships in actual material selection and design, and are merely schematic diagrams of structures or positions, among which:

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 is a side view of the present invention;

[0029] Figure 3 Schematic diagram of a test thrust adapter of the present invention.

[0030] Description of the reference numerals in the accompanying drawings:

[0031] 1-first test piece, 2-second test piece, 3-exhaust channel, 4-sealing plug, 5-end face sealing ring, 6-bolt hole, 7-pressure sensor, 8-sensor connecting plate, 9-transition plate, 11-cylinder, 12-piston rod. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is 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 invention and are not intended to limit the present invention. That is, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0033] The following combination Figures 1 to 3 The present invention is described in detail.

[0034] Example 1

[0035] like Figures 1 and 2 As shown, the floating support mechanism for the thrust adapter of the present invention includes a first test piece 1 and a second test piece 2. An end face B of the first test piece 1 contacts an end face C of the second test piece 2 through a lubricating fluid, and an end face sealing ring 5 is provided between the end faces B and C to prevent the lubricating fluid from overflowing therebetween.

[0036] When testing the thrust adapter, the thrust adapter is installed in the load-bearing frame used for the test, and the bottom of the cylinder 11 of the thrust adapter is fixed to one side of the load-bearing hole of the load-bearing frame; the floating support mechanism is installed in the load-bearing frame, and the side of the second test piece 2 away from the first test piece 1 is connected to the other side of the load-bearing hole of the load-bearing frame, and the floating thrust plate of the thrust adapter is in contact with the first test piece 1.

[0037] The first test piece 1 and the floating thrust plate are pushed simultaneously by a radial oil cylinder. The friction coefficient can be obtained by analyzing the data collected by the displacement sensor for collecting the extension length of the radial oil cylinder piston rod and the pressure sensor for collecting the extension force of the piston rod.

[0038] In the present invention, a floating thrust plate that is in a floating state and independent of the piston rod is floated and positioned by a floating support mechanism, thereby providing the floating thrust plate with a floating support having as little friction as possible, facilitating testing of the floating thrust adapter and ensuring the accuracy and high precision of relevant test data.

[0039] In the present invention, since the end of the piston rod of the floating thrust plate of the thrust adapter away from the thrust adapter is the connection end for subsequent testing of the rocket engine, in order to protect the accuracy of the rocket engine test data, this end needs to be protected. Therefore, it is realized by the first test piece 1 to achieve floating contact with the second test piece, thereby preventing this end from being worn, contaminated by lubricating fluid, and other adverse conditions, ensuring the smooth progress of subsequent engine tests and ensuring the high accuracy of relevant data collection.

[0040] Example 2

[0041] This embodiment further illustrates the present invention based on the embodiment 1.

[0042] When applying lubricating fluid between end face B and end face C, it is impossible to ensure that the surface of the lubricating fluid is a flat plane. Therefore, when lubricating fluid is applied to end face B and / or end face C, the first test piece is installed on one side of the second test piece so that end face B contacts end face C through the lubricating fluid. The contact surface between them is not a completely flat plane because the surface of the lubricating fluid is not a completely flat plane. Therefore, when end face B and end face C contact through the lubricating fluid, there is air between them. The air will increase the friction between end face B and end face C, which is not conducive to the collection of various parameters. Therefore, the following structure is adopted:

[0043] like Figure 1 As shown, the second test piece 2 is provided with an exhaust channel 3 connecting the space sealed by the inner ring of the end face sealing ring 5 with the outside world, and a sealing plug 4 is provided at one end of the exhaust channel 3 connected to the outside world to seal the end thereof.

[0044] Furthermore, one end of the exhaust duct 3 is connected to the plate surface A, and the other end thereof is connected to the circumferential surface of the second test piece 2 .

[0045] Furthermore, the exhaust channel 3 includes an axial channel and a radial channel connected in sequence, and the end of the axial channel away from the radial channel is connected to the space sealed by the inner ring of the end face sealing ring 5, and the end of the radial channel away from the axial channel is connected to the circumferential surface of the second test piece 2.

[0046] The installation of test piece 1 and test piece 2 is as follows: S1. Apply lubricating fluid to end face B and / or end face C; S2. Set the first test piece on one side of the second test piece, and the end face B contacts the end face C through the lubricating fluid; S3. Fix the second test piece, and apply an extrusion force perpendicular to the end face B to the first test piece, press the first test piece onto the second test piece, and then discharge the gas between the end face B and the end face C through the exhaust duct 3, thereby reducing or even eliminating the gas between the end face B and the end face C, and then reducing the friction between the end face B and the end face C, so as to facilitate the collection of various parameters; S4. Then use the sealing plug 4 to seal the end of the exhaust duct 3 connected to the outside world.

[0047] Example 3

[0048] In order to facilitate the assembly of the present invention: the outer circumferential surfaces of the first specimen 1 and the second specimen 2 and the side away from each other are both convex to form an outward edge, and bolt holes 6 are provided on the outward edge, which are coaxial with each other and with the axis perpendicular to the end face B. The end of the rod of the guide bolt passes through the bolt hole 6 on the outward edge of the second specimen 2 and then passes out from the bolt hole 6 on the outward edge of the first specimen 1.

[0049] Example 4

[0050] like Figure 1 As shown, an axial pressure sensor assembly is installed on the side of the second specimen 2 away from the first specimen 1, and the axial pressure sensor assembly includes a pressure sensor 7 and two plate assemblies respectively connected to the two sides of the pressure sensor 7, and the plate assembly includes a transition plate 9 and a sensor connecting plate 8 connected in sequence, and the sensor connecting plate 8 is connected to the pressure sensor 7, and one of the transition plates 9 is connected to the second specimen 2, and one of the sensor connecting plates 8 is connected to the collection end of the pressure sensor 7.

[0051] Furthermore, the transition plate 9 is a frustum structure, and its small diameter end is connected to the sensor connecting plate 8 .

[0052] Example 5

[0053] like Figure 1 As shown, there are three end face sealing rings 5, which are the first end face sealing ring, the second end face sealing ring and the third end face sealing ring from the inside to the outside.

[0054] Furthermore, the end face sealing ring 5 is an end face Gly ring.

[0055] Example 6

[0056] When designing a floating support mechanism, based on conventional floating configurations in the field, lubricating oil is typically used for the floating support. However, further reducing the frictional force exerted on the floating thrust plate requires a breakthrough from existing conventional methods, employing an unconventional lubricating fluid as the floating support fluid for the floating thrust plate. The following tests clearly demonstrate that the friction coefficient of grease is lower than that of lubricating oil. Using grease for the fluid support of the floating thrust plate can further reduce the frictional force exerted by the present invention on the floating thrust plate, facilitate relevant parameter collection, improve collection accuracy, and reduce interference caused by friction.

[0057] The experimental analysis of the friction force of different lubricating fluids between the first and second test pieces is as follows:

[0058] AActual test conditions:

[0059] Ambient temperature: +10℃~+23℃;

[0060] Air humidity: around 92%;

[0061] Surface wind speed: light breeze;

[0062] Instantaneous wind speed: breeze.

[0063] B Lubricating fluid: grease and oil

[0064] C test process:

[0065] (1) Assemble the first and second test pieces according to the assembly requirements and place them on the test platform. Apply grease between them and apply radial load to the first test piece. The friction coefficients obtained are as follows:

[0066] Table 1 Grease loading test data

[0067]

[0068] (2) After assembling the first and second test pieces according to the assembly requirements, place them on the test platform, apply lubricating oil between them, and apply radial load to the first test piece. The friction coefficients obtained are as follows:

[0069] Table 2 Lubricating oil loading test data

[0070]

[0071] From the above, it can be seen that the friction coefficient of grease is much smaller than that of lubricating oil. Using grease for floating support of floating thrust plate can further reduce the floating friction of floating thrust plate, facilitate the collection of various parameters, improve the accuracy of collection, and reduce the interference caused by friction.

[0072] Example 7

[0073] A thrust adapter testing method, the thrust adapter comprising a floating thrust plate and a support assembly for radially and axially floating support thereof, the support assembly comprising a single plunger cylinder, wherein an end face A of a piston rod 12 of the single plunger cylinder extending out of an oil chamber of a cylinder barrel 11 of the single plunger cylinder contacts a side plate face A of the floating thrust plate via a lubricating fluid, and an end face sealing ring 5 is disposed between the end face A and the plate face A to prevent leakage of the lubricating fluid therebetween; an exhaust duct 3 is disposed on the floating thrust plate to connect a space sealed by an inner ring of the end face sealing ring A to the outside world, and a sealing plug 4 is disposed at one end of the exhaust duct 3 to seal the end thereof;

[0074] like Figure 3 As shown, the test method includes the following steps:

[0075] S1. Install the thrust adapter in the test load frame, and fix the bottom of the cylinder 11 to one side of the load hole of the load frame;

[0076] S2. Install the floating support mechanism in the load-bearing frame. Connect the side of the second specimen 2 away from the first specimen 1 to the other side of the load-bearing hole of the load-bearing frame via the axial pressure sensor assembly, and ensure that the floating thrust plate is in contact with the first specimen 1.

[0077] S3, exhaust: supply oil to the single plunger cylinder to extend the piston rod 12, thereby increasing the axial extrusion force between the piston rod and the floating thrust plate, and then exhausting the gas between the end surface A and the plate surface A through the exhaust channel 3, and the gas between the end surface B and the end surface C through the exhaust channel 3;

[0078] S4, then use the sealing plug 4 to block the end of the exhaust duct 3 connected to the outside world, and use the sealing plug 4 to block the end of the exhaust duct 3 connected to the outside world;

[0079] S5. Apply an axial load to the thrust adapter to collect its load bearing capacity; apply a radial load to the floating thrust plate and the first test piece 1 at the same time to collect the friction force of the floating thrust plate.

[0080] In the present invention, a floating thrust plate that is in a floating state and independent of the piston rod is floated and positioned by a floating support mechanism, thereby providing the floating thrust plate with a floating support having as little friction as possible, facilitating testing of the floating thrust adapter and ensuring the accuracy and high precision of relevant test data.

[0081] In the present invention, since the end of the piston rod of the floating thrust plate of the thrust adapter away from the thrust adapter is the connection end for subsequent testing of the rocket engine, in order to protect the accuracy of the rocket engine test data, this end needs to be protected. Therefore, it is realized by the first test piece 1 to achieve floating contact with the second test piece, thereby preventing this end from being worn, contaminated by lubricating fluid, and other adverse conditions, ensuring the smooth progress of subsequent engine tests and ensuring the high accuracy of relevant data collection.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thrust adapter test method, characterized in that: The thrust adapter includes a floating thrust plate and a support assembly for radially and axially floating support thereof, wherein the support assembly includes a single plunger cylinder, wherein an end face A of a piston rod (12) of the single plunger cylinder extends out of an oil chamber of a cylinder barrel (11) of the single plunger cylinder and contacts a side plate face A of the floating thrust plate (10) through a lubricating fluid, and an end face sealing ring A (15) is provided between the end face A and the plate face A to prevent the lubricating fluid from overflowing therebetween; an exhaust duct A (13) is provided on the floating thrust plate (10) to connect a space sealed by an inner ring of the end face sealing ring A (15) with the outside world, and a sealing plug A (14) is provided at one end of the exhaust duct A (13) connected with the outside world to block the end thereof; The other side of the floating thrust plate (10) is connected to a first test piece (1), and the other side of the first test piece (1) is connected to a second test piece (2). An end face B of one end of the first test piece (1) contacts an end face C of one side of the second test piece (2) through a lubricating fluid, and an end face sealing ring (5) is provided between the end face B and the end face C to prevent the lubricating fluid from overflowing. An exhaust duct (3) is provided on the second test piece (2) to connect the space sealed by the inner ring of the end face sealing ring (5) with the outside world, and a sealing plug (4) is provided at one end of the exhaust duct (3) connected to the outside world to block the end thereof. The test method comprises the following steps: S1. Install the thrust adapter in a test load-bearing frame, with the bottom of the cylinder (11) fixed to one side of the load-bearing hole of the load-bearing frame; S2, installing the floating support mechanism in the load-bearing frame, connecting the side of the second test piece (2) away from the first test piece (1) to the other side of the load-bearing hole of the load-bearing frame via the axial pressure sensor assembly, and the floating thrust plate is in contact with the first test piece (1); S3, exhaust: supply oil to the single plunger cylinder to extend the piston rod (12), thereby increasing the axial extrusion force between the piston rod and the floating thrust plate, and then exhausting the gas between the end surface A and the plate surface A through the exhaust channel A (13), and the gas between the end surface B and the end surface C through the exhaust channel (3); S4, then use a sealing plug (4) to seal the end of the exhaust duct (3) connected to the outside world, and use a sealing plug (4) to seal the end of the exhaust duct (3) connected to the outside world; S5. Apply an axial load to the thrust adapter to collect its load bearing capacity; A radial load is applied to the floating thrust plate and the first test piece (1) simultaneously to collect the friction force of the floating thrust plate.

2. The thrust adapter test method according to claim 1, characterized in that: One end of the exhaust duct (3) is in communication with the plate surface A, and the other end thereof is in communication with the circumferential surface of the second test piece (2).

3. The thrust adapter testing method according to claim 2, characterized in that: The exhaust channel (3) includes an axial channel and a radial channel that are connected in sequence. One end of the axial channel away from the radial channel is connected to the space sealed by the inner ring of the end face sealing ring (5), and one end of the radial channel away from the axial channel is connected to the circumferential surface of the second test piece (2).

4. The thrust adapter testing method according to claim 1, wherein: The outer circumferential surfaces of the first test piece (1) and the second test piece (2) and the sides away from each other are both convex to form an outward turning edge, and bolt through holes (6) are provided on the outward turning edge, which are coaxial with each other and whose axes are perpendicular to the end face B. The end of the rod of the guide bolt passes through the bolt through hole (6) on the outward turning edge of the second test piece (2) and then passes out from the bolt through hole (6) on the outward turning edge of the first test piece (1).

5. The thrust adapter testing method according to claim 1, wherein: An axial pressure sensor assembly is installed on a side of the second test piece (2) away from the first test piece (1), the axial pressure sensor assembly comprising a pressure sensor (7) and two plate assemblies respectively connected to both sides of the pressure sensor (7), the plate assembly comprising a transition plate (9) and a sensor connecting plate (8) connected in sequence, the sensor connecting plate (8) being connected to the pressure sensor (7), one of the transition plates (9) being connected to the second test piece (2), and one of the sensor connecting plates (8) being connected to a collection end of the pressure sensor (7).

6. The thrust adapter testing method according to claim 5, characterized in that: The transition plate (9) is a truncated cone structure, and its small diameter end is connected to the sensor connecting plate (8).

7. The thrust adapter test method according to any one of claims 1 to 6, characterized in that: There are three end face sealing rings (5), which are, from inside to outside, a first end face sealing ring, a second end face sealing ring and a third end face sealing ring.

8. The thrust adapter testing method according to any one of claims 1 to 6, characterized in that: The end face sealing ring (5) is an end face Gly ring.

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