Rotary engine end face seal ring end face tribological performance testing device

Abstract

The present application belongs to the technical field of testing of mechanical parts, and particularly relates to a rotor engine end face sealing ring end face tribology performance testing device, which comprises a support, a lifting device, a test table and a power device; the support is used for installing the power device; the power device comprises a power driver, a torque sensor, a rotor eccentric shaft and a balance block, the torque sensor is installed on the output end of the driver, the rotor eccentric shaft is installed on the output end of the torque sensor, and the balance block is installed on the rotor eccentric shaft; the lifting device comprises a lifting table and a lifting driver, and the lifting driver is used for driving the lifting table to make reciprocating linear motion; the test table comprises a pressure sensor and a fixing clamp, the fixing clamp and the pressure sensor are installed on the lifting table, and the measurement stroke direction of the pressure sensor is parallel to the motion direction of the lifting driver. The present application solves the problem of how to truly and efficiently test the tribology performance between the end face sealing ring and the end face of a cycloid rotor engine.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of testing of mechanical parts, and particularly relates to a rotor engine end face sealing ring end face tribology performance testing device. BACKGROUND

[0002] With the progress of engine technology, there is an increasing demand for higher power density, and rotor engines have the characteristics of high power density, making them the main power source of new energy range extenders and small unmanned aerial vehicles. Compared with triangular rotor engines, the trochoidal rotor engine exchanges the rotor and the cylinder, and its advantages are higher power density, higher compression ratio, easier adjustment of compression ratio, easier lubrication, and more uniform heating of the entire engine. The core of the trochoidal rotor engine is the sealing and friction problem, and the end face sealing is the core of ensuring the cylinder pressure of the rotor engine combustion chamber. Better sealing can improve fuel utilization, increase power, have a better combustion environment, and be more environmentally friendly. The main part of the end face sealing is the end face sealing ring, and its tribological performance and dynamic sealing performance directly determine the sealing, power, and fuel consumption of the rotor engine.

[0003] The tribological performance of the end face sealing ring has two extremes. One is to simplify the friction pair as a simple ball-block pair, which cannot truly reflect the various friction performances of the material under actual conditions. The other is to only install the end face sealing ring into the engine for friction experiments. Although this process truly reflects the performance of the material, it is time-consuming and labor-intensive, and many rotor parts are used only once. Repeated disassembly and assembly of the engine have a great impact on its performance and are high in cost. The above two are extremely unfavorable for the tribological research of the end face sealing ring material. SUMMARY

[0004] The present application aims to provide a rotor engine end face sealing ring end face tribology performance testing device to solve the problem of how to truly and efficiently test the tribological performance between the end face sealing ring and the end face of the trochoidal rotor engine.

[0005] To achieve the above purpose, the scheme of the present application is as follows: a rotor engine end face sealing ring end face tribology performance testing device, comprising a support, a lifting device, a test bench, and a power device:

[0006] The support is used to install the power device, and the lifting device and the test bench are located at the output end of the power device;

[0007] The power device comprises a power driver, a torque sensor, a rotor eccentric shaft, and a balance block. The torque sensor is installed on the output end of the driver, the rotor eccentric shaft is installed on the output end of the torque sensor, and the balance block is installed on the rotor eccentric shaft;

[0008] The lifting device comprises a lifting platform and a lifting driver, and the lifting driver is used to drive the lifting platform to move in a reciprocating linear motion.

[0009] The test bench comprises a pressure sensor and a fixing clamp, and the fixing clamp and the pressure sensor are installed on the lifting platform, and the measurement stroke direction of the pressure sensor is parallel to the movement direction of the lifting driver.

[0010] The working principle and beneficial effects of the scheme are that the end face (i.e., the end cover of the rotor engine) to be tested is fixed to the lifting platform through the fixing clamp, the end face sealing ring to be tested is installed on the corresponding rotor, and then the rotor is installed on the rotor eccentric shaft. The lifting driver is started, the lifting platform is moved, the end face contacts the pressure sensor, the pressure sensor starts to show the number, and continues to move until the bolt compression force when the rotor engine is actually installed. The power driver is started, the power driver drives the rotor eccentric shaft to rotate, the rotor eccentric shaft is connected with the rotor, and the whole friction and wear process starts. Under the action of the friction force, the torque sensor measures the friction torque, converts the friction torque into the friction coefficient, and obtains the friction coefficient of the whole end face sealing ring under the actual bolt compression force, so as to facilitate the research on the lubrication characteristics of the end face sealing ring material.

[0011] The scheme achieves a balance between the two extremes in the prior art, simplifies the rotor engine, directly uses the rotor and the end cover as a friction pair, and directly uses the end face sealing ring to participate in friction and wear, and is provided with a balance block to balance the centrifugal force and the bending moment. Moreover, the rotor is used in the scheme instead of a rigid tooling, and the actual profile is generated by using the rotor instead of simple rotary friction movement, so that the working state of the end face sealing ring is more truly restored. The scheme can not only ensure the authenticity of the friction and wear process, but also greatly simplify the process of installing the end face sealing ring into the rotor engine, truly restore the working state of the end face sealing ring, and has actual guiding significance for the friction and wear performance of the material.

[0012] Optionally, the test bench further comprises an end face friction plate, and the end face friction plate is fixed to the lifting platform through the fixing clamp. The material of the end face is usually fixed, and more research and exploration is made on the tribological performance of the end face sealing ring under different materials, so that the end face friction plate can be used as a conventional component of the whole device, and only the end face sealing ring and the corresponding rotor need to be replaced, thereby further simplifying the test process.

[0013] Optionally, the test bench further comprises at least two acceleration sensors, the acceleration sensors are installed on the end face friction plate through the acceleration sensor support, wherein at least one acceleration sensor is used to abut against the end face of the rotor which is opposite to the end face friction plate, and at least one acceleration sensor abuts against the position on the rotor profile which is in contact with the radial sealing sheet. In the friction process, the friction characteristics of different materials are different, and different friction characteristics will produce different vibrations in the friction experiment of the end face sealing ring made of different materials. The scheme measures the vibration of the rotor in the vertical direction and the profile direction, so as to characterize the vibration characteristics through the data of the acceleration sensor. The vibration characteristics generated by the end face sealing ring of different materials in the actual application and how to reduce the vibration and wear have guiding significance.

[0014] Optionally, the test bench further comprises a temperature sensor, the temperature sensor is installed in the temperature sensor installation hole on the side of the end face friction plate which is opposite to the rotor. Friction heat is an important parameter for characterizing the friction and wear characteristics of materials. In order to obtain the friction heat of the end face sealing ring and the end cover, the temperature sensor is arranged in the hole at the lower end of the end cover, the hole depth is close to the friction surface, and the heat transfer exists, but the heat transfer can be converted through thermodynamics.

[0015] Optionally, the end face friction plate comprises an intake structure of the rotor engine, and a gas flow meter and a gas pressure meter are installed at the gas inlet of the intake structure. The gas flow meter is used to fill gas into the rotor. Since the rotor forms a chamber directly on the surface of the end cover, the gas will generate gas pressure after entering the chamber. The gas pressure meter obtains the size of the gas pressure. In the rotating process, the gas will leak in the radial direction of the end face friction plate. The gas is filled all the time, and after the gas pressure is balanced, the amount of gas filled is equal to the amount of gas leaked (the reading of the flow meter is the amount of leakage). Therefore, the dynamic sealing effect of the end face sealing ring made of different materials can be directly detected.

[0016] Optionally, the test bench further comprises a non-contact displacement sensor, the non-contact displacement sensor is installed in the non-contact displacement sensor installation hole on the side of the end face friction plate which is opposite to the rotor, and the non-contact displacement sensor installation hole is a through hole. The scheme can measure the thickness of the leaked gas film during the rotation of the rotor filled with gas. Although the operation process of the rotor is irregular, the same point will repeatedly return to a position, and the sensor is installed at the repeated position to measure the thickness of the gas film. The scheme has guiding significance for the study of gas tightness and the study of friction and wear under the gas film.

[0017] Optionally, the fixing clamp comprises a plurality of clamping units, and the clamping units are installed on the lifting table.

[0018] Optionally, the lifting device further comprises a lifting seat, and the lifting table is slidably connected to the guide rail.

[0019] Optionally, the lifting drive includes one of a linear motor, an air cylinder, an oil cylinder, an electric cylinder, a screw mechanism or a threaded mechanism.

[0020] Optionally, the threaded mechanism includes a threaded hole provided on the lifting base, a threaded rod being threadedly connected within the threaded hole, one end of the threaded rod being rotatably connected to the lifting platform, the threaded rod also being provided with a limiting structure for limiting axial displacement of the lifting platform, and a lifting handle being provided at the other end of the threaded rod. By rotating the handle, the lifting platform is controlled by the threads of the threaded rod and the threaded hole, thereby precisely adjusting the position of the lifting platform and controlling the magnitude of the friction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of a device for testing the tribological performance of an end face sealing ring of a rotary engine according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic structural diagram of the end friction plate and the structure below the lifting platform in an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the installation position of the non-contact displacement sensor in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The marks in the drawings of the specification include: motor 1, torque sensor 2, rotor eccentric shaft 3, balancing block 4, end friction plate 5, fixing fixture 6, clamping seat 601, clamping screw 602, lifting device 7, lifting platform 701, guide rail 702, threaded rod 703, lifting handle 704, pressure sensor 8, acceleration sensor 9, acceleration sensor bracket 10, rotor 11, temperature sensor 12, air intake structure 13, non-contact displacement sensor mounting hole 14.

[0026] Example

[0027] This embodiment is basically as Figure 1 、 Figure 2 Shown: A device for testing the tribological properties of the end face of a rotary engine end face sealing ring, including a bracket, a lifting device 7, a test bench, and a power unit:

[0028] The bracket is used to install the power unit. The bracket is a portal frame, consisting of a vertical frame and a horizontal frame. The bracket is installed vertically on the ground. The lifting device 7 is installed on the ground directly below the portal frame. The power unit is installed on the bracket beam, and the test bench is located on the lifting device 7 directly below the power unit.

[0029] The power unit includes a power driver, a torque sensor 2, a rotor eccentric shaft 3, and a balancing weight 4. In this embodiment, the power driver is a motor 1; in other embodiments, it can be a pneumatic motor or a hydraulic motor. The torque sensor 2 is mounted on the output end of the motor 1, the rotor eccentric shaft 3 is mounted on the output end of the torque sensor 2, and the balancing weight 4 is mounted on the rotor eccentric shaft 3. The end face sealing ring to be tested is installed on the corresponding rotor 11, and then the rotor 11 is mounted on the rotor eccentric shaft 3.

[0030] The lifting device 7 includes a lifting seat, a lifting platform 701 and a lifting drive. The lowering platform is provided with a guide rail 702, and the lifting platform 701 is slidably connected to the guide rail 702; in this embodiment, the lifting drive is a threaded mechanism, which includes a threaded hole provided on the lifting seat, and a threaded rod 703 is threadedly connected in the threaded hole. One end of the threaded rod 703 is rotatably connected to the lifting platform 701, and the threaded rod 703 is also provided with a limiting structure for limiting the axial displacement of the lifting platform 701 in the threaded rod 703. In this embodiment, the limiting structure is two annular grooves opened near the end of the threaded rod 703. The distance between the annular grooves is slightly larger than the thickness of the lifting platform 701. An external retaining spring is provided in the annular groove. The lifting platform 701 is clamped between the two external retaining springs, and a lifting handle 704 is provided on the end of the threaded rod 703 away from the external retaining spring.

[0031] The test bench includes an end friction plate 5, a pressure sensor 8, and a fixture 6. The fixture 6 and pressure sensor 8 are mounted on a lifting platform 701. The fixture 6 comprises three clamping units, each of which includes a clamping base 601 and a clamping screw 602. The clamping screw 602 is threadedly connected to and extends through the clamping base 601. The clamping base 601 is mounted on the lifting platform 701. The end friction plate 5 is secured to the test bench by tightening the clamping screw 602. The measuring stroke of the pressure sensor 8 is parallel to the direction of motion of the lifting actuator, which is vertical in this embodiment. The measuring end of the pressure sensor 8 is vertically downward, abutting the lifting platform 701. The other end of the pressure sensor 8 is fixed to the end friction plate. Due to the relative forces acting on the lifting platform 701, the force exerted on the pressure sensor 8 by the upward movement of the lifting platform 701 is equal to the force (i.e., friction) exerted by the end friction plate 5 on the end sealing ring of the rotor 11. The friction force is adjusted by turning a handle; the higher the lifting platform 701 is, the greater the friction force. At the start button, motor 1 rotates the eccentric shaft of rotor 11, connecting rotor eccentric shaft 3 to rotor 11, and the entire friction and wear process begins. Under the action of friction, torque sensor 2 measures the friction torque and converts it into the friction coefficient, thus obtaining the friction coefficient of the entire end face sealing ring under the actual bolt tightening force.

[0032] The test bench also includes two acceleration sensors 9, which are mounted on the end friction plate 5 via an acceleration sensor bracket 10. One acceleration sensor 9 is aligned with the end face of the rotor 11 where the end face sealing ring is mounted, and the other acceleration sensor 9 is aligned with the position on the rotor 11 profile where the radial sealing piece contacts the rotor 11. These two acceleration sensors 9 measure the vibration of the rotor 11 in the vertical direction and along the profile, thereby characterizing the different vibration characteristics of different end face sealing rings through the data from the acceleration sensors 9.

[0033] The test bench also includes several temperature sensors 12, located in the temperature sensor mounting holes on the side of the end friction plate 5 facing away from the rotor 11. A hole is drilled in the lower end of the end cap, where the temperature sensors 12 are located, to measure the frictional heat between the end seal ring and the end cap. The hole depth is close to the friction surface, so while heat transfer occurs, it can be accounted for using thermodynamics. Frictional heat is used to characterize the friction and wear characteristics of a material.

[0034] In this embodiment, the end friction plate 5 also includes an intake structure 13 of the rotor 11 engine and a non-contact displacement sensor. The non-contact displacement sensor is located in a non-contact displacement sensor mounting hole 14 on the side of the end friction plate 5 facing away from the rotor 11. The non-contact displacement sensor mounting hole 14 is a through hole. Figure 3 As shown. A gas flow meter and a gas pressure gauge are installed at the air inlet of the air intake structure 13. Gas is filled into the rotor 11 through the gas flow meter. Since a chamber is directly formed on the surface of the end cover in the rotor 11, air pressure will be generated after the gas enters. The gas pressure gauge obtains the air pressure. During the rotation, the gas will leak in the radial direction of the end friction plate 5. The inflation is maintained. After the air pressure stabilizes and balances, the amount of gas filled is the same as the amount of gas leaked (the flow meter reading is the leakage amount). This makes it possible to intuitively detect the dynamic sealing effect of the end face sealing rings of different materials. This process is a qualitative research process, in order to find the end face sealing ring material or process with minimum friction and minimum leakage. If a material is used to make an end face sealing ring and obtains a small friction coefficient on this test bench, and the leakage is also small, then this material will also have the same friction performance and sealing performance when actually used in the rotor 11 engine.

[0035] The above is only an embodiment of the present application, the present application is not limited to this embodiment The field to which the embodiment relates, common knowledge of specific structures and characteristics in the scheme, etc. is not described in detail here The ordinary skilled person in the art knows all the ordinary technical knowledge in the field to which the present application belongs before the filing date or the priority date, can know all the prior art in the field, and has the ability to apply conventional experimental means before that date The ordinary skilled person in the art can perfect and implement the present scheme under the guidance of the present application, in combination with their own ability Some typical known structures or known methods should not be an obstacle to the implementation of the present application by the ordinary skilled person in the art It should be noted that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can also be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent The scope of protection claimed in the present application should be subject to the content of its claims The specific implementation in the specification can be used to explain the content of the claims

Claims

1. A device for testing the tribological properties of the end face of a rotary engine end seal ring, characterized by: Including bracket, lifting device, test bench and power unit: The bracket is used to install the power unit, and the lifting device and test bench are located at the output end of the power unit; The power device includes a power driver, a torque sensor, a rotor eccentric shaft and a balance block. The torque sensor is installed on the output end of the driver, the rotor eccentric shaft is installed on the output end of the torque sensor, and the balance block is installed on the rotor eccentric shaft. The lifting device includes a lifting platform and a lifting drive, and the lifting drive is used to drive the lifting platform to perform reciprocating linear motion; The test bench includes a pressure sensor and a fixing fixture. The fixing fixture and the pressure sensor are installed on the lifting platform. The measuring stroke direction of the pressure sensor is parallel to the movement direction of the lifting drive. The test bench also includes an end friction plate, which is fixed to the lifting platform by a fixing fixture; The test bench also includes at least two acceleration sensors, which are mounted on the end friction plate through an acceleration sensor bracket, wherein at least one acceleration sensor is used to abut against the end surface of the rotor facing away from the end friction plate, and at least one acceleration sensor is used to abut against a position on the rotor profile that contacts the radial sealing sheet; The test bench also includes a temperature sensor, which is installed in a temperature sensor installation hole on the side of the end friction plate facing away from the rotor; The end friction plate includes an air intake structure of the rotary engine, and a gas flow meter and a gas pressure gauge are installed at the air intake of the air intake structure; The test bench also includes a non-contact displacement sensor, which is located in a non-contact displacement sensor mounting hole on the side of the end friction plate facing away from the rotor. The non-contact displacement sensor mounting hole is a through hole.

2. The rotary engine end face sealing ring end face tribological performance testing device according to claim 1, characterized in that: The fixing fixture includes a plurality of clamping units, and the clamping units are installed on the lifting platform.

3. The rotary engine end face sealing ring end face tribological performance testing device according to claim 1, characterized in that: The lifting device also includes a lifting seat, a guide rail is provided on the lifting platform, and the lifting platform is slidably connected to the guide rail.

4. The rotary engine end seal ring end face tribological performance testing device according to claim 1, characterized in that: The lifting drive includes one of a linear motor, an air cylinder, an oil cylinder, an electric cylinder, a screw mechanism or a thread mechanism.

5. The device for testing the tribological properties of the end face of the rotary engine end seal ring according to claim 4, characterized in that: The threaded mechanism includes a threaded hole set on the lifting seat, a threaded rod is threadedly connected to the threaded hole, one end of the threaded rod is rotatably connected to the lifting platform, and the threaded rod is also provided with a limiting structure that limits the axial displacement of the lifting platform on the threaded rod. A lifting handle is provided on the other end of the threaded rod.

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