Device for testing end face tribological performance of end face sealing ring of rotor engine

Abstract

The invention belongs to the technical field of testing of mechanical parts, and particularly relates to a rotor engine end face sealing ring end face tribological performance testing device which comprises a support, a lifting device, a test bed and a 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 at the output end of the driver, the rotor eccentric shaft is installed at 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 do reciprocating rectilinear motion; the test bench comprises a pressure sensor and a fixing clamp, the fixing clamp and the pressure sensor are installed on the lifting platform, and the measuring stroke direction of the pressure sensor is parallel to the moving direction of the lifting driver. The problem of how to truly and efficiently test the tribological performance between the end face sealing ring and the end face of the cycloid rotor engine is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of testing mechanical parts, and in particular relates to a device for testing the tribological performance of an end face of an end face sealing ring of a rotary engine. Background Art

[0002] With the advancement of engine technology, the demand for higher power density is increasing. The high power density of the rotary engine makes it a new energy extended-range power generation device and the main power source for small drones. Compared with the triangular rotor engine, the cycloidal rotor engine exchanges the rotor and the cylinder. Its advantages are higher power density than the triangular rotor engine, higher compression ratio and easier to adjust the compression ratio, easier lubrication and more uniform heating of the engine as a whole. The core of the cycloidal rotor engine is the sealing and friction problems. The end face seal is the core to ensure the cylinder pressure of the rotary engine combustion chamber. Better sealing can improve fuel utilization, increase power, have a better combustion environment, and be more emission-friendly. The main component of the end face seal is the end face sealing ring. Its tribological performance and dynamic sealing performance directly determine the sealing, power, and fuel consumption of the rotary engine.

[0003] There are two extremes in the tribological performance of the end face sealing ring. One is to simplify the friction pair into a simple ball-block friction, which cannot truly reflect the various friction properties of the material under actual conditions. The other is that the end face sealing ring can only be installed in the engine for friction testing. Although this process truly reflects the performance of the material, it is time-consuming and laborious. Many parts of the rotor are disposable, and repeated disassembly and assembly of the engine has a great impact on its performance and is costly. The above two are extremely unfavorable for the tribological research of the end face sealing ring material. Summary of the invention

[0004] The present invention is intended to provide a device for testing the tribological performance of the end face sealing ring of a rotor engine, so as 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 a cycloid rotor engine.

[0005] In order to achieve the above-mentioned purpose, the scheme of the present invention is: a device for testing the tribological performance of the end face of the end face sealing ring of a rotary engine, comprising a bracket, a lifting device, a test bench and a power device:

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

[0007] The power device includes a power driver, a torque sensor, a rotor eccentric shaft and a balancing block, wherein the torque sensor is mounted on the output end of the driver, the rotor eccentric shaft is mounted on the output end of the torque sensor, and the balancing block is mounted on the rotor eccentric shaft;

[0008] 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;

[0009] 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 moving direction of the lifting drive.

[0010] The working principle and beneficial effects of this scheme are as follows: the end face to be tested (i.e., the end cover of the rotary engine) is fixed to the lifting platform by a fixing fixture, and 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 drive is started, the lifting platform moves, and after the end face contacts the pressure sensor, the pressure sensor begins to show a number and continues to move until the bolt clamping force is reached when the rotary engine is actually installed. The power drive is started, and the power drive drives the rotor eccentric shaft to rotate. The rotor eccentric shaft is connected to the rotor, and the entire friction and wear process begins. Under the action of friction force, the torque sensor measures the friction torque, and the friction torque is converted into the friction coefficient. The friction coefficient is an important parameter in the material friction and wear experiment, thereby obtaining the friction coefficient of the entire end face sealing ring under the actual bolt clamping force, which is convenient for studying the lubrication characteristics of the end face sealing ring material.

[0011] This solution achieves a balance between the two extremes of the prior art, simplifies the rotary engine, directly uses the rotor and the end cover as a friction pair, and the end face sealing ring directly participates in friction and wear, and is equipped with a balance block to balance the centrifugal force and bending moment. Moreover, this solution uses a rotor instead of a rigid tooling, and uses the rotor to generate actual profiles instead of simple rotational friction motion, so that it can more realistically restore the working state of the end face sealing ring. This solution 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 rotary engine, and realistically restore the working state of the end face sealing ring, which has practical guiding significance for the friction and wear performance of its material.

[0012] Optionally, the test bench also includes an end friction plate, which is fixed to the lifting platform by a fixing fixture. The material of the end face is usually relatively fixed, and more research and exploration is done on the tribological properties of the end face sealing ring under different materials. Therefore, the end face friction plate can be used as a regular component of the entire device, and only the end face sealing ring and the corresponding rotor need to be replaced, which further simplifies the test process.

[0013] Optionally, the test bench also includes at least two acceleration sensors, which are installed on the end friction plate through an acceleration sensor bracket, wherein at least one acceleration sensor is used to abut against the end face of the rotor facing away from the end friction plate, and at least one acceleration sensor abuts against the position on the rotor profile that contacts the radial sealing plate. During the friction process, different materials have different friction characteristics. Therefore, when conducting friction tests on end face sealing rings made of different materials, different friction characteristics will produce different vibrations. This solution measures the vibration of the rotor in the vertical direction and the profile direction, thereby characterizing its vibration characteristics through the data of the acceleration sensor, which has guiding significance for the vibration characteristics of end face sealing rings made of different materials in actual applications and how to reduce vibration and wear.

[0014] Optionally, 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. Friction heat is an important parameter to characterize the friction and wear characteristics of materials. In order to obtain the friction heat between the end face sealing ring and the end cover, this solution opens a hole at the lower end of the end cover and arranges a temperature sensor. The hole depth is close to the friction surface. Although heat transfer exists, it can be converted through thermodynamics.

[0015] Optionally, the end friction plate includes an air intake structure of a rotary engine, and a gas flow meter and a gas pressure gauge are installed at the air intake of the air intake structure. Gas is filled into the rotor through the gas flow meter. Since a chamber is directly formed on the surface of the end cover in the rotor, air pressure is generated after the gas enters, and the gas pressure gauge obtains the air pressure. During the rotation process, the gas leaks in the radial direction of the end friction plate. The inflation is maintained, and after the air pressure is stabilized and balanced, the amount of gas filled is the amount of gas leaked (the indication of the flow meter is the leakage amount). In this way, the dynamic sealing effect of the end face sealing rings of different materials can be intuitively detected.

[0016] Optionally, the test bench also includes a non-contact displacement sensor, which is in a non-contact displacement sensor mounting hole on the side of the end friction plate facing away from the rotor, and the non-contact displacement sensor mounting hole is a through hole. This solution can measure the thickness of the leaked air film during the rotor inflation and rotation process. Although the rotor's running process has an irregular profile, the same point will repeatedly return to a position. The sensor is installed at this repeated position to measure the thickness of the air film. It has guiding significance for airtightness research and friction and wear research under air film.

[0017] Optionally, the fixing fixture includes a plurality of clamping units, and the clamping units are installed on the lifting platform.

[0018] Optionally, the lifting device also includes a lifting seat, the lifting platform is provided with a guide rail, and the lifting platform is slidably connected to the guide rail.

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

[0020] Optionally, the threaded mechanism includes a threaded hole provided on the lifting seat, a threaded rod is threadedly connected in the threaded hole, one end of the threaded rod is rotatably connected to the lifting platform, the threaded rod is also provided with a limiting structure for limiting the displacement of the lifting platform in the axial direction of the threaded rod, and a lifting handle is provided on the other end of the threaded rod. By rotating the hand, the lifting and lowering of the lifting platform is controlled under the threaded cooperation of the threaded rod and the threaded hole, so as to accurately adjust the position of the lifting platform and accurately control the magnitude of the friction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a device for testing the tribological properties of the end face of a rotary engine end face sealing ring in an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the end surface 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 in 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 Figure 1 , Figure 2 As shown: a rotor engine end face sealing ring end face tribological performance testing device, including a bracket, a lifting device 7, a test bench and a power device:

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

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

[0030] The lifting device 7 includes a lifting seat, a lifting platform 701 and a lifting drive. The lifting platform is provided with a guide rail 702, and the lifting platform 701 is slidably connected to the guide rail 702; in the present embodiment, the lifting drive is a threaded mechanism, and the threaded mechanism includes a threaded hole arranged 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 the present embodiment, the limiting structure is two annular grooves opened near the ends of the threaded rod 703, and 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, and the lifting platform 701 is clamped between the two external retaining springs. 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 fixing fixture 6. The fixing fixture 6 and the pressure sensor 8 are installed on the lifting platform 701. The fixing fixture 6 includes three clamping units. Each clamping unit includes a clamping seat 601 and a clamping screw 602. The clamping screw 602 is threadedly connected to the clamping seat 601 and passes through the clamping seat 601. The clamping seat 601 is installed on the lifting platform 701. The end friction plate 5 is fixed on the test bench by screwing the clamping screw 602. The measuring stroke direction of the pressure sensor 8 is parallel to the moving direction of the lifting drive, which is the vertical direction in this embodiment. The measuring end of the pressure sensor 8 is vertically downward against the lifting platform 701, and the other end of the pressure sensor 8 is fixed to the end friction plate. According to the relative action of the force, the force applied to the pressure sensor 8 by the lifting platform 701 moving upward is equal to the force (i.e., friction force) applied by the end friction plate 5 to the end face sealing ring on the rotor 11. The friction force is adjusted by turning the handle. The higher the lifting platform 701 is, the greater the friction force is. When the start button is clicked, the motor 1 drives the eccentric shaft of the rotor 11 to rotate, and the eccentric shaft 3 of the rotor is connected to the rotor 11, and the whole friction and wear process begins. Under the action of friction force, the torque sensor 2 measures the friction torque, converts the friction torque into the friction coefficient, and thus obtains 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 through an acceleration sensor bracket 10. One acceleration sensor 9 is used to abut against the end face position of the rotor 11 where the end face sealing ring is mounted, and the other acceleration sensor 9 abuts against the position on the rotor 11 profile that contacts the radial sealing sheet. The vibration of the rotor 11 in the vertical direction and the profile direction is measured by the two acceleration sensors 9, so that the different vibration characteristics of different end face sealing rings are characterized by the data of the acceleration sensors 9.

[0033] The test bench also includes a number of temperature sensors 12, which are distributed in the temperature sensor 12 installation holes on the side of the end friction plate 5 facing away from the rotor 11. A hole is opened at the lower end of the end cover, and the temperature sensor 12 is arranged to obtain the friction heat between the end face sealing ring and the end cover. The hole depth is close to the friction surface. Although heat transfer exists, it can be converted through thermodynamics. The friction and wear characteristics of the material are characterized by friction heat.

[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 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 flowmeter 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 flowmeter. 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 is stabilized and balanced, the amount of gas filled is the amount of leakage (the flowmeter reading is the leakage amount). In this way, the dynamic sealing effect of the end face sealing rings of different materials can be intuitively detected. This process is a qualitative research process, in order to find the end face sealing ring material or process with the minimum friction and minimum leakage. If a material is made into 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 in the actual application of the rotor 11 engine.

[0035] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records 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 face sealing ring, characterized in that: Including bracket, lifting device, test bench and power unit: The bracket is used to install the power unit, and the lifting device and the 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 balancing block, wherein the torque sensor is mounted on the output end of the driver, the rotor eccentric shaft is mounted on the output end of the torque sensor, and the balancing block is mounted 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 moving direction of the lifting drive.

2. The rotary engine end face sealing ring end face tribological performance testing device according to claim 1, characterized in that: The test bench also includes an end friction plate, which is fixed to the lifting platform through a fixing fixture.

3. The rotary engine end seal ring end face tribological performance testing device according to claim 2, characterized in that: The test bench also includes at least two acceleration sensors, which are installed on the end friction plate through an acceleration sensor bracket, at least one of which is used to abut against the end face of the rotor facing away from the end friction plate, and at least one acceleration sensor abuts against the position on the rotor profile that contacts the radial sealing sheet.

4. The rotary engine end seal ring end face tribological performance testing device according to claim 3, characterized in that: The test bench also includes a temperature sensor, which is installed in a temperature sensor installation hole on a side of the end friction plate facing away from the rotor.

5. The rotary engine end seal ring end face tribological performance testing device according to claim 2, characterized in that: The end friction plate includes an air intake structure of a rotary engine, and a gas flow meter and a gas pressure gauge are installed at the air intake of the air intake structure.

6. The rotary engine end seal ring end face tribological performance testing device according to claim 5, characterized in that: The test bench also includes a non-contact displacement sensor, which is arranged in a non-contact displacement sensor mounting hole on a side of the end friction plate facing away from the rotor, and the non-contact displacement sensor mounting hole is a through hole.

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

8. The rotary engine end seal 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 arranged on the lifting platform, and the lifting platform is slidably connected to the guide rail.

9. 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 lead screw mechanism or a threaded mechanism.

10. The rotary engine end face sealing ring end face tribological performance testing device according to claim 9, 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, the threaded rod is also provided with a limiting structure to limit the axial displacement of the lifting platform on the threaded rod, and a lifting handle is provided on the other end of the threaded rod.

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