Airway test bench mirror device and engine cylinder head airway test system

Abstract

The present invention provides an airway test bench mirror device and an engine cylinder head airway test system. The device includes a base, a mirror container, a vent pipe, a simulated cylinder liner, a mirror, and a reflector. The mirror container is fixed to the base. One end of the vent pipe is connected to the bottom surface of the base and communicates with the inner cavity of the mirror container. The other end of the vent pipe is an air extraction end. One end of the simulated cylinder liner is connected to the top wall of the mirror container and communicates with the inner cavity of the mirror container. The other end of the simulated cylinder liner is used to fix the cylinder head sample and input tracer particles. The simulated cylinder liner is light-transmissive to allow imaging of axial cross-sections at different positions. Two mirrors are respectively mounted on adjacent side walls of the simulated cylinder liner to allow light to pass through the mirrors and enter the mirror container. The reflector is adjustably mounted in the mirror container to reflect light passing through each mirror. The device is advantageous in improving test accuracy and convenient installation and arrangement, and facilitates miniaturization of the airway test bench body.

Description

Technical Field

[0001] The present invention relates to the technical field of engine cylinder head airway performance testing technology, and in particular to an airway test bench mirror device and an engine cylinder head airway testing system. Background Art

[0002] Airway test benches typically use PIV (Particle Image Velocimetry) to test airway flow characteristics. This technology uses the test bench to simulate the intake state of a cylinder head sample, then uses a laser to generate a light sheet and a high-speed camera to capture the flow field.

[0003] Patent application CN108303260A discloses an airway test bench with a pressure-stabilizing chamber located below a glass cylinder. Below this chamber, a reflector is installed to reflect laser or camera light. This airway test bench employing this solution suffers from the following technical issues:

[0004] 1. The arrangement of the reflector below the voltage-stabilizing cavity results in an excessively long optical path. The optical path arrangement has certain limitations. Specifically, when reflecting the laser sheet light source, the light sheet light source is fan-shaped. When it reaches the target cross-section area, the laser is too dispersed and the intensity is attenuated, affecting the test accuracy.

[0005] 2. The reflector is placed below the pressure-stabilizing chamber, which is extremely inconvenient for the arrangement of the laser and camera, and the installation and operation space are limited. The laser produces a linear light source, which needs to pass through a cylindrical mirror to form a sheet light source. The arrangement of the above optical components requires a certain amount of space, and the optical components usually need to be installed on a horizontal surface and supported and adjusted by corresponding brackets. The pressure-stabilizing chamber itself is large, and the reflector is placed below close to the ground, making the actual arrangement of the optical components difficult to implement.

[0006] 3. The airway test bench has a large flow rate, and the corresponding pressure stabilizing chamber volume is relatively large. It is arranged directly under the main body of the test bench, resulting in a relatively large overall height.

[0007] 4. The diameter and length of the glass cylinder cannot be changed. Summary of the Invention

[0008] In view of the above, the present invention provides an airway test bench mirror device to solve at least one of the above technical problems, which is beneficial to improving the test accuracy and the convenience of installation and arrangement, and is beneficial to the miniaturization of the airway test bench body.

[0009] The technical solution of the present invention:

[0010] The present invention provides an airway test bench mirror device, comprising a base, a mirror container, a vent pipe, a simulated cylinder liner, a mirror and a reflector. The mirror container is fixed on the base, one end of the vent pipe is connected to the bottom surface of the base and communicates with the inner cavity of the mirror container, the other end of the vent pipe is an exhaust end, one end of the simulated cylinder liner is connected to the top wall of the mirror container and communicates with the inner cavity of the mirror container, the other end of the simulated cylinder liner is used to fix a cylinder head sample and input tracer particles, the simulated cylinder liner is light-transmitting for photographing axial sections at different positions, two mirrors are respectively installed on adjacent two side walls of the simulated cylinder liner to allow light to pass through the mirrors and enter the mirror container, and the reflector is installed in the mirror container with an adjustable position to reflect light passing through each mirror.

[0011] Furthermore, three mirrors are arranged on the mirror container, and the three mirrors are respectively located on the three side walls of the mirror container.

[0012] Furthermore, the sight glass container includes a base plate and a cover body fixed on the base plate, the reflector is arranged in the cover body, a lower air vent connected to the cover body is opened on the base plate for connecting the ventilation pipe, an upper air vent hole is opened on the top wall of the cover body for docking and installing the simulated cylinder sleeve, and a light-transmitting hole is opened on the side wall of the cover body for sealing and installing the sight glass.

[0013] Furthermore, the viewing mirror container also includes a movable door installed on the side wall of the cover body, the movable door and the viewing mirror are respectively located on different side walls of the cover body, and a door hole is opened on one side wall of the cover body, and the movable door is sealed inside.

[0014] Furthermore, the sight glass container also includes an inner flange, which is fixed at the light-transmitting hole on the side wall of the cover body. The outer surface of the inner flange is provided with a mounting groove adapted to the sight glass, and a sealing ring is provided in the mounting groove. The sight glass is placed on the sealing ring in the mounting groove, and a sealing ring is provided on the outer surface of the sight glass to seal and fix the sight glass through the outer flange.

[0015] Furthermore, the ventilation pipe includes a flange portion, a cone and a connecting pipe that are integrally connected in sequence. The flange portion is fixed to the bottom surface of the base, and a sealing member is sandwiched between the flange portion and the base. The end of the cone with a larger outer diameter is integrally connected to the flange portion, and the end of the cone with a smaller outer diameter is integrally connected to one end of the connecting pipe. The other end of the connecting pipe is the exhaust end.

[0016] Furthermore, the simulated cylinder liner includes a metal cylinder liner and a transparent cylinder liner. The bottom end of the metal cylinder liner is detachably mounted on the top wall of the sight glass container, and the bottom end of the transparent cylinder liner is sealed and mounted on the top end of the metal cylinder liner. The top end of the transparent cylinder liner is used to fix the cylinder cover sample and input tracer particles.

[0017] Furthermore, it also includes a reflector adjustment component and a bracket for adjusting the rotation angle and tilt angle. The reflector adjustment component is installed on the base and is located at the center position in the viewfinder container. The bracket is installed on the reflector adjustment component, and the reflector is installed on the bracket at an angle.

[0018] Furthermore, the reflector adjustment assembly includes a rotational displacement stage and an inclination displacement stage. The rotational displacement stage is mounted on the base and is located at the center position of the mirror container. The rotation axis of the rotational displacement stage coincides with the vertical center axis of the mirror container. The inclination displacement stage is mounted on the rotating movable end of the rotational displacement stage, and the bracket is mounted on the inclination movable end of the inclination displacement stage to adjust the inclination angle of the reflector on the bracket.

[0019] The present invention also provides an engine cylinder head airway test system, comprising a tracer particle generator, a tracer particle input pipe, a blower, a voltage stabilizer, an exhaust pipe and the airway test bench sight glass device. The cylinder head sample is fixed to the top of a simulated cylinder liner. The tracer particle generator passes through the cylinder head sample through the tracer particle input pipe and is connected to the simulated cylinder liner to input tracer particles into the simulated cylinder liner. The blower and the voltage stabilizer are connected to the ventilation pipe in turn through the exhaust pipe to suck the sight glass container and the simulated cylinder liner to form a stable flowing airflow.

[0020] Beneficial effects of the present invention:

[0021] The airway test bench mirror device of the present invention adopts the method of installing mirrors on two adjacent side walls of the mirror container and arranging an adjustable reflector at an angle in the mirror container. A sheet light source generated by a laser can be used to horizontally transmit a certain mirror. The light sheet is reflected upward by the reflector into the simulated cylinder liner, thereby forming a light sheet on the axial cross section of the simulated cylinder liner. The camera can be focused on the axial cross section to capture the image, thereby capturing an axial cross section of the simulated cylinder liner. Then, the reflector is adjusted to face the mirror of the adjacent side wall so that the reflector corresponds to the position of the mirror on the adjacent side wall. The sheet light source generated by the laser is used to horizontally transmit the mirror. The light sheet is reflected upward by the reflector into the simulated cylinder liner, thereby forming a light sheet on the axial cross section of the simulated cylinder liner. The camera can be focused on the axial cross section to capture the image, thereby capturing another axial cross section of the simulated cylinder liner. In addition, the laser is used to generate a light sheet to transmit the simulated cylinder liner in a direction parallel to the horizontal plane to illuminate the cross section of the simulated cylinder liner. The camera is used to align the corresponding mirror. The light path of the camera passes through the mirror and then through the reflector to capture the cross section of the simulated cylinder liner. In this way, the shooting of two axial sections and one cross section of the simulated cylinder liner is realized, which improves the convenience and accuracy of shooting different sections of the airway test bench.

[0022] The airway test bench viewing mirror device of the present invention can be placed on the same horizontal plane as the laser and the camera, thereby avoiding unnecessary errors and improving the test accuracy.

[0023] The airway test bench mirror device of the present invention is introduced for the first time below the cylinder head sample, which is conducive to the miniaturization of the airway test bench main body and can be placed directly on the test bench surface. Both the laser and the camera can be placed on the same test bench surface without the need for separate arrangements, thereby improving the convenience of installation and layout.

[0024] The main purpose of testing engine cylinder head samples on an airway test bench is to evaluate the airway performance, and one of the parameters for evaluating this performance is the tumble ratio. Tumble is induced by the shape of the airway and the shape of the combustion chamber during the engine intake stroke. During the airway test bench test, it should be ensured that fully developed turbulence is generated in the simulated cylinder liner, the flow field state of the real engine intake stroke is restored, and the Euler method is used to study the motion laws of fluid particles located at different spatial points in the flow field. The present invention adopts a sight glass container to extract air at the bottom of the simulated cylinder liner, and the flow velocity of the simulated flow field below the cylinder liner is uniform, which can meet the test requirements and is conducive to improving the test accuracy. It effectively avoids the problem that the existing solution uses the exhaust holes on the side of the bottom of the transparent cylinder, which causes the flow velocity of the transparent cylinder close to the exhaust side to be inconsistent with the flow velocity on the other side, thereby interfering with the original tumble.

[0025] The preferred embodiments of the present invention and their beneficial effects will be further described in detail in conjunction with specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but should not be construed as limiting the present invention.

[0027] Figure 1 A perspective view of the airway test bench mirror device of the present invention;

[0028] Figure 2 A top view of the airway test bench mirror device of the present invention;

[0029] Figure 3 is a schematic cross-sectional view of the airway test bench mirror device of the present invention;

[0030] Figure 4 A first perspective perspective view of the mirror container of the airway test bench mirror device of the present invention;

[0031] Figure 5 A second perspective view of the mirror container of the airway test bench mirror device of the present invention;

[0032] Figure 6 A structural diagram of the reflector adjustment assembly and bracket of the airway test bench mirror device of the present invention;

[0033] Figure 7 This is a schematic structural diagram of the engine cylinder head airway testing system of the present invention in a first use state;

[0034] Figure 8 This is a structural schematic diagram of the engine cylinder head airway testing system of the present invention in the second usage state.

[0035] Explanation of the accompanying figures: cylinder head sample 10, base 1, sight glass container 2, vent pipe 3, simulated cylinder sleeve 4, sight glass 5, reflector 6, bottom plate 21, cover 22, lower vent 211, upper vent hole 221, light hole 222, movable door 23, door opening 223, square flange 24, inner flange 25, outer flange 26, top flange 27, flange part 31, cone 32, connecting pipe 33, metal cylinder sleeve 41, transparent cylinder sleeve 42, reflector adjustment Joint assembly 7, bracket 8, rotation displacement stage 71, inclination displacement stage 72, magnetic base 73, fixed block 81, movable block 82, clamping plate 83, adjusting bolt 84, tilting block 85, base plate 11, supporting foot 12, ventilation groove 13, tracer particle generator 20, tracer particle input tube 30, fan 40, voltage stabilizer 50, exhaust pipe 60, laser 70, camera 80, control valve 301, pressure gauge 601, pressure regulating valve 602. DETAILED DESCRIPTION

[0036] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0037] See also Figures 1 to 3 The present invention provides an airway test bench mirror device for measuring the airway performance of a cylinder head sample 10. The airway test bench mirror device includes a base 1, a mirror container 2, a vent pipe 3, a simulated cylinder liner 4, a mirror 5 and a reflector 6. The mirror container 2 is fixed on the base 1, one end of the vent pipe 3 is connected to the bottom surface of the base 1 and is connected to the inner cavity of the mirror container 2, and the other end of the vent pipe 3 is an exhaust end. One end of the simulated cylinder liner 4 is connected to the top wall of the mirror container 2 and is connected to the inner cavity of the mirror container 2, and the other end of the simulated cylinder liner 4 is used to fix the cylinder head sample 10 and input tracer particles. The simulated cylinder liner 4 is light-transmitting for shooting axial sections at different positions. Three mirrors 5 are respectively installed on the three side walls of the mirror container 2 to allow light to pass through the mirror 5 and enter the mirror container 2. The reflector 6 is installed in the mirror container 2 in an adjustable position to reflect the light passing through each mirror 5.

[0038] The airway test bench mirror device of the present invention adopts a method of installing a mirror 5 on each of the three side walls of the mirror container 2, and arranging an adjustable reflector 6 at an angle inside the mirror container 2. A sheet light source generated by a laser can be used to horizontally transmit a certain mirror 5. The light sheet is reflected upward by the reflector 6 into the simulated cylinder liner 4, thereby forming a light sheet on the axial section of the simulated cylinder liner 4. By focusing a camera on the axial section, a photo can be taken, thereby capturing an axial section of the simulated cylinder liner 4. Then, the reflector 6 is adjusted toward the mirror 5 on the adjacent side wall so that the position of the reflector 6 corresponds to that of the mirror 5 on the adjacent side wall. A sheet light source generated by a laser can be used to horizontally transmit the mirror 5. The light sheet is reflected upward by the reflector 6 into the simulated cylinder liner 4, thereby forming a light sheet on the axial section of the simulated cylinder liner 4. By focusing a camera on the axial section, a photo can be taken, thereby capturing another axial section of the simulated cylinder liner 4. In addition, a laser light sheet is used to transmit light parallel to the horizontal plane through the simulated cylinder liner 4, illuminating the cross section of the simulated cylinder liner 4. A camera is then aligned with the corresponding viewing mirror 5. The camera's light path passes through the viewing mirror 5 and then through the reflector 6 to capture the cross section of the simulated cylinder liner 4. This allows the capture of two axial sections and one cross section of the simulated cylinder liner 4, improving the convenience and accuracy of capturing different cross sections on the airway test bench.

[0039] The airway test bench viewing mirror device of the present invention can be placed on the same horizontal plane as the laser and the camera, thereby avoiding unnecessary errors and improving the test accuracy.

[0040] The airway test bench mirror device of the present invention is introduced for the first time below the cylinder head sample 10, which is conducive to the miniaturization of the airway test bench main body and can be placed directly on the test bench surface. Both the laser and the camera can be placed on the same test bench surface without the need for separate arrangements, thereby improving the convenience of installation and layout.

[0041] The main purpose of testing engine cylinder head samples on an airway test bench is to evaluate airway performance, and one of the parameters for evaluating this performance is the tumble ratio. Tumble is induced by the airway shape and combustion chamber shape during the engine's intake stroke. During testing on an airway test bench, fully developed turbulence should be generated within the simulated cylinder liner 4 to restore the flow field state of the actual engine intake stroke. The Euler method should be used to study the motion patterns of fluid particles located at different spatial points in the flow field. The present invention uses a sight glass container 2 to evacuate air from the bottom end of the simulated cylinder liner 4, simulating a uniform flow velocity in the flow field below the cylinder liner 4. This meets testing requirements, improves test accuracy, and effectively avoids the problem of the existing solution (Announcement No. CN110108493B) using exhaust holes on the side of the transparent cylinder bottom, which results in inconsistent flow velocities on the exhaust side of the transparent cylinder and on the other side, thus interfering with the original tumble.

[0042] In this embodiment, in order to place the laser and camera more flexibly during actual use, three mirrors 5 are arranged on the mirror container 2, but it is not limited to this. In other embodiments, the mirror container 2 can be arranged with two mirrors 5, and the two mirrors 5 are respectively located on two adjacent side walls of the mirror container 2.

[0043] See also Figures 3 to 5 In this embodiment, the sight glass container 2 includes a base plate 21 and a cover 22 fixed to the base plate 21. The inner cavity of the cover 22 is used to accommodate the reflector 6. The base plate 21 is provided with a lower vent 211 connected to the cover 22 for connection to the vent pipe 3. The top wall of the cover 22 is provided with an upper vent hole 221 for docking and mounting the simulated cylinder liner 4. The three side walls of the cover 22 are provided with light-transmitting holes 222 for sealed mounting of the sight glass 5. It is understood that light-transmitting holes 222 can also be provided in two adjacent side walls of the cover 22.

[0044] The sight glass container 2 is provided with a structure that matches a bottom plate 21 and a cover body 22 fixed on the bottom plate 21, and a lower air vent 211 connected to the cover body 22 is provided on the bottom plate 21. The ventilation pipe 3 is connected through the lower air vent 211 to evacuate air to the cover body 22. An upper air vent 221 is provided on the top wall of the cover body 22. The upper air vent 221 can be docked and installed with a simulated cylinder liner 4. By fixing the cylinder head sample 10 on the top of the simulated cylinder liner 4 and inputting tracer particles, it is convenient to use PIV image particle velocimetry technology to test the airway flow field characteristics. Light-transmitting holes 222 for the sight glass 5 to be installed are provided on the three side walls of the cover body 22 to facilitate the transmission of light into the cover body 22. It can support various forms of light path arrangements, thereby photographing different cross sections of the simulated cylinder liner 4.

[0045] In this embodiment, the mirror container 2 further includes a movable door 23 mounted on the sidewall of the housing 22. The movable door 23 and the mirror 5 are located on different sidewalls of the housing 22. A door opening 223 is defined in the sidewall of the housing 22 where the movable door 23 is mounted, and the movable door 23 is sealed therein. This allows the movable door 23 to be removed and the door opening 223 to be opened, facilitating installation and commissioning of the reflector 6 and cleaning and wiping of the mirror 5. Preferably, the mirror container 2 further includes a square flange 24, which is sealedly secured to the sidewall of the housing 22 and surrounds the door opening 223. The outer surface of the square flange 24 is provided with a sealing groove adapted for the movable door 23 and adapted to receive a sealing ring. The movable door 23 is secured to the outer surface of the square flange 24 by bolts to seal the door opening 223. The bolted connection between the square flange 24 and the movable door 23 offers the advantages of simple structure, high structural strength, excellent sealing performance, and durability, which is consistent with the objectives of the present invention. It is understandable that the movable door 23 can also be hinged to the door opening 223 of the side wall of the cover body 22, and the movable door 23 can be locked to the door opening 223 by a locking device to achieve sealing.

[0046] In this embodiment, the cover body 22 adopts a rectangular shell structure with four side walls, so as to facilitate the corresponding arrangement of three mirrors 5 and a movable door 23, which has the advantages of simple structure and easy manufacturing.

[0047] In this embodiment, to facilitate sealing and securing the sight glass 5, the sight glass container 2 further includes an inner flange 25, which is secured to the light-transmitting hole 222 in the sidewall of the housing 22. The outer surface of the inner flange 25 is provided with a mounting groove adapted for the sight glass 5. A sealing ring is provided within the mounting groove, and the sight glass 5 is placed onto the sealing ring within the mounting groove. The outer surface of the sight glass 5 is further provided with a sealing ring, thereby sealing and securing the sight glass 5 via the outer flange 26. This seals and protects the sight glass 5, preventing cracking caused by uneven force during securing. In this embodiment, the sight glass 5 and the inner flange 25 are both circular, facilitating mounting and securing, but the present invention is not limited thereto. The sight glass 5 and the inner flange 25 may also be square or polygonal in shape.

[0048] In this embodiment, to facilitate sealing and securing the simulated cylinder liner 4, the sight glass container 2 further includes a top flange 27. This top flange 27 is secured to the upper vent hole 221 on the top wall of the housing 22 and is bolted to the bottom end of the simulated cylinder liner 4. A sealing groove is provided on the upper surface of the top flange 27, adapted to fit the bottom end of the simulated cylinder liner 4, for receiving a sealing ring to seal the connection between the simulated cylinder liner 4 and the top flange 27.

[0049] In this embodiment, a plurality of connection holes are formed on the bottom plate 21 for fixed connection with the base 1 via bolts.

[0050] In this embodiment, the vent tube 3 is arranged coaxially with the simulated cylinder liner 4. This facilitates uniform flow velocity in the flow field below the simulated cylinder liner 4, better meeting test requirements, and further improving test accuracy. The vent tube 3 includes a flange portion 31, a cone 32, and a connecting pipe 33, which are integrally connected in sequence. The flange portion 31 is fixed to the bottom surface of the base 1, and a seal is sandwiched between the flange portion 31 and the base 1. The end of the cone 32 with a larger outer diameter is integrally connected to the flange portion 31, and the end of the cone 32 with a smaller outer diameter is integrally connected to one end of the connecting pipe 33. The other end of the connecting pipe 33 serves as an exhaust end. The vent tube 3 adopts a structure in which the flange portion 31, cone 32, and connecting pipe 33 are integrally connected. The structure is simple and easy to install and fix. The cone 32 facilitates sufficient and uniform suction of the sight glass container 2, further improving the uniformity of the flow velocity in the flow field below the simulated cylinder liner 4, better meeting test requirements, and further improving test accuracy.

[0051] See also Figure 3 and Figure 4In this embodiment, the simulated cylinder liner 4 comprises a metal liner 41 and a transparent liner 42. The bottom end of the metal liner 41 is removably mounted on the top wall of the sight glass container 2 and communicates with the upper vent 221 of the cover 22. The bottom end of the transparent liner 42 is sealedly mounted on the top end of the metal liner 41. The top end of the transparent liner 42 is used to secure the cylinder head sample 10 and inject tracer particles. Because the metal liner 41 is removable, the simulated cylinder liner 4 can be matched with a cylinder head sample 10 of different diameters and lengths to meet the testing requirements of different cylinder head samples. This can cover the cylinder heads of gasoline and diesel engines, thereby resolving the problem of the unchangeable diameter and length of the glass cylinder barrel in the existing patent solution.

[0052] The metal cylinder sleeve 41 includes an integrally connected bottom flange and a sleeve. The bottom flange is sealed and mounted on the top flange 27 of the sight glass container 2 by bolts. The sleeve has a pressure sensor interface at one end close to the transparent cylinder sleeve 42 for installing a pressure sensor, thereby facilitating pressure monitoring.

[0053] It can be understood that the simulated cylinder sleeve 4 is not limited to the above structure. For example, the simulated cylinder sleeve 4 can also be directly connected to the top wall of the sight glass container 2 using a glass tube.

[0054] See also Figure 3 and Figure 6 In this embodiment, the airway test bench mirror device further includes a reflector adjustment assembly 7 and a bracket 8 for adjusting the rotation angle and tilt angle. The reflector adjustment assembly 7 is mounted on the base 1 and located at the center of the mirror container 2. The bracket 8 is mounted on the reflector adjustment assembly 7, and the reflector 6 is tiltedly mounted on the bracket 8. The reflector adjustment assembly 7 adjusts the rotation angle so that the reflector 6 on the bracket 8 faces the mirror 5 in different positions. The reflector adjustment assembly 7 adjusts the tilt angle so that the reflector 6 on the bracket 8 is adjusted to a 45-degree tilt angle.

[0055] In this embodiment, the reflector adjustment assembly 7 includes a rotational displacement stage 71 and an inclination displacement stage 72. The rotational displacement stage 71 is mounted on the base 1 and located at the center of the mirror container 2. The rotation axis of the rotational displacement stage 71 coincides with the vertical center axis of the mirror container 2. The inclination displacement stage 72 is mounted on the rotating movable end of the rotational displacement stage 71. The bracket 8 is mounted on the inclination movable end of the inclination displacement stage 72 to adjust the inclination angle of the reflector 6 on the bracket 8. The rotational displacement stage 71 and the inclination displacement stage 72 are both readily available accessories, and their structures and principles are not further described herein. The rotational displacement stage 71 and the inclination displacement stage 72 can both be adjusted automatically or manually. To facilitate assembly and position adjustment, the reflector adjustment assembly 7 also includes a magnetic base 73, which is mounted between the base 1 and the rotational displacement stage 71. The magnetic base 73 is a readily available accessory, and its structure and principles are not further described herein.

[0056] In this embodiment, the bracket 8 includes a fixed block 81, a movable block 82, a clamping plate 83, an adjusting bolt 84, and a tilting block 85. The fixed block 81 and the movable block 82 are arranged parallel to the tilting platform 72. The fixed block 81 is fixed to the tilting platform 72, and the movable block 82 is slidably disposed on the tilting platform 72. The fixed block 81 and the movable block 82 are both mounted with a clamping plate 83. An adjusting bolt 84 is horizontally extended through the fixed block 81 and the movable block 82. One end of the adjusting bolt 84 is rotatably connected to the fixed block 81, and the other end of the adjusting bolt 84 is threadedly connected to the movable block 82. Rotating the adjusting bolt 84 can move the two clamping plates 83 closer or farther apart. The tilting block 85 is clamped between the two clamping plates 83, and the reflector 6 is fixed to the inclined surface of the tilting block 85. The bracket 8 adopting the above-mentioned structural design is simple in structure, easy to install, and easy to achieve the tilting arrangement of the reflector 6.

[0057] See also Figures 1 to 3 In this embodiment, the base 1 includes a base plate 11 and support legs 12. The base plate 11 is fixed to the bottom plate 21 of the sight glass container 2. A ventilation groove 13 is provided in the area of ​​the base plate 11 located within the sight glass container 2 to connect the sight glass container 2 and the ventilation pipe 3. Four support legs 12 are mounted at the four corners of the base plate 11 so that they can be raised and lowered. The support legs 12 allow the overall height and levelness of the sight glass container 2 to be adjusted within a certain range. Different cylinder head samples 10 have different cylinder diameters and thicknesses, requiring the use of simulated cylinder liners 4 of different cylinder diameters and lengths. When the cylinder head sample 10 is fixed, centered, and tightened, it is necessary to allow for a certain amount of adjustment in the height of the simulated cylinder liners 4. Preferably, the base plate 11 is provided with lifting lugs to facilitate lifting during installation.

[0058] See also Figure 7 The present invention provides an engine cylinder head airway testing system utilizing the aforementioned airway test bench sight glass device. The system comprises an airway test bench sight glass device, a tracer particle generator 20, a tracer particle inlet pipe 30, a blower 40, a voltage regulator 50, and an exhaust pipe 60. A cylinder head sample 10 is secured to the top of a simulated cylinder liner 4. The tracer particle generator 20, via the tracer particle inlet pipe 30, passes through the cylinder head sample 10 and communicates with the simulated cylinder liner 4 to feed tracer particles into the simulated cylinder liner 4. The blower 40 and the voltage regulator 50 are in turn connected to the ventilation pipe 3 via the exhaust pipe 60 to draw air from the sight glass container 2 and the simulated cylinder liner 4 to form a stable airflow. When the tracer particle generator 20 and the blower 40 are in operation, a laser 70 generates a light sheet, which is then captured by a camera 80 to obtain information about the flow field formed by the cylinder head sample 10 within the simulated cylinder liner 4.

[0059] When photographing the cross section of the simulated cylinder liner 4, the laser 70 is horizontally arranged at the outer periphery of the simulated cylinder liner 4. The laser 70 generates a light sheet that is transmitted through the simulated cylinder liner 4 in a direction parallel to the horizontal plane, illuminating the cross section of the simulated cylinder liner 4. The camera 80 is arranged at the viewing mirror 5 corresponding to the light reflected by the reflector 6 for photographing. The light path of the camera 80 passes through the viewing mirror 5 and then through the reflector 6 to photograph the cross section of the simulated cylinder liner 4.

[0060] See also Figure 8 When photographing two axial cross-sections of the simulated cylinder liner 4, laser 70 is positioned at the mirror 5 corresponding to the light reflected by reflector 6. The light sheet generated by laser 70 horizontally transmits through mirror 5 and is reflected upward by reflector 6 into the simulated cylinder liner 4, forming a light sheet at the axial cross-section of the simulated cylinder liner 4. Camera 80 is positioned at the periphery of the simulated cylinder liner 4 and focuses on this axial cross-section for photographing, thereby photographing one axial cross-section of the simulated cylinder liner 4. Then, reflector 6 is adjusted toward the mirror 5 of the adjacent sidewall so that the position of reflector 6 corresponds to the position of the mirror 5 of the adjacent sidewall, and another axial cross-section of the simulated cylinder liner 4 is photographed in the same manner.

[0061] In this embodiment, the tracer particle inlet pipe 30 is further provided with a control valve 301 to control the flow of the tracer particles. The exhaust pipe 60 is provided between the vent pipe 3 and the pressure regulator 50 with a pressure gauge 601 and a pressure regulating valve 602 arranged in sequence along the suction direction for monitoring and regulating the pressure.

[0062] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying importance. The terms "bottom" and "top," as well as "inner" and "outer," refer to directions toward or away from a specific component, respectively.

[0063] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to connections between the internal parts of two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An airway test bench mirror device, characterized in that: The invention comprises a base (1), a sight glass container (2), a vent pipe (3), a simulated cylinder sleeve (4), a sight glass (5) and a reflector (6), wherein the sight glass container (2) is fixed on the base (1), one end of the vent pipe (3) is connected to the bottom surface of the base (1) and is communicated with the inner cavity of the sight glass container (2), the other end of the vent pipe (3) is an exhaust end, one end of the simulated cylinder sleeve (4) is connected to the top wall of the sight glass container (2) and is communicated with the inner cavity of the sight glass container (2), and the simulated cylinder sleeve (4) is connected to the top wall of the sight glass container (2) and is communicated with the inner cavity of the sight glass container (2). The other end is used to fix the cylinder head sample (10) and input tracer particles. The simulated cylinder liner (4) has light transmittance for photographing axial sections at different positions. Two sight glasses (5) are respectively installed on the adjacent two side walls of the simulated cylinder liner (4) so ​​that light can pass through the sight glasses (5) and enter the sight glass container (2). The reflector (6) is installed in the sight glass container (2) in an adjustable position to reflect the light passing through each sight glass (5) and can photograph the cross section of the simulated cylinder liner.

2. The airway test bench mirror device according to claim 1, characterized in that: A total of three sight glasses (5) are arranged on the sight glass container (2), and the three sight glasses (5) are respectively located on three side walls of the sight glass container (2).

3. The airway test bench mirror device according to claim 1, characterized in that: The sight glass container (2) comprises a bottom plate (21) and a cover (22) fixed on the bottom plate (21). The reflector (6) is arranged in the cover (22). The bottom plate (21) is provided with a lower vent (211) connected to the cover (22) for connecting the vent pipe (3). The top wall of the cover (22) is provided with an upper vent hole (221) for docking and mounting the simulated cylinder sleeve (4). The side wall of the cover (22) is provided with a light-transmitting hole (222) for sealing and mounting the sight glass (5).

4. The airway test bench mirror device according to claim 3, characterized in that: The sight glass container (2) further comprises a movable door (23) mounted on a side wall of the cover body (22), the movable door (23) and the sight glass (5) being respectively located on different side walls of the cover body (22), a door opening (223) being provided on one side wall of the cover body (22), and the movable door (23) being sealed therein.

5. The airway test bench mirror device according to claim 3, characterized in that: The sight glass container (2) further comprises an inner flange (25), the inner flange (25) being fixed to the light-transmitting hole (222) on the side wall of the cover body (22), the outer surface of the inner flange (25) being provided with a mounting groove adapted to the sight glass (5), a sealing ring being provided in the mounting groove, the sight glass (5) being placed on the sealing ring in the mounting groove, and the outer surface of the sight glass (5) being provided with a sealing ring so as to seal and fix the sight glass (5) through the outer flange (26).

6. The airway test bench viewing mirror device according to claim 1, characterized in that: The vent pipe (3) comprises a flange portion (31), a cone (32) and a connecting pipe (33) which are integrally connected in sequence. The flange portion (31) is fixed to the bottom surface of the base (1), and a sealing member is sandwiched between the flange portion (31) and the base (1). The end of the cone (32) with a larger outer diameter is integrally connected to the flange portion (31), and the end of the cone (32) with a smaller outer diameter is integrally connected to one end of the connecting pipe (33). The other end of the connecting pipe (33) is an exhaust end.

7. The airway test bench mirror device according to claim 1, characterized in that: The simulated cylinder sleeve (4) includes a metal cylinder sleeve (41) and a transparent cylinder sleeve (42). The bottom end of the metal cylinder sleeve (41) is detachably mounted on the top wall of the sight glass container (2). The bottom end of the transparent cylinder sleeve (42) is sealed and mounted on the top end of the metal cylinder sleeve (41). The top end of the transparent cylinder sleeve (42) is used to fix the cylinder cover sample (10) and input tracer particles.

8. The airway test bench mirror device according to claim 1, characterized in that: The mirror adjusting assembly (7) and the bracket (8) for adjusting the rotation angle and the tilt angle are also included. The mirror adjusting assembly (7) is mounted on the base (1) and is located at the center of the mirror container (2). The bracket (8) is mounted on the mirror adjusting assembly (7). The reflector (6) is tiltedly mounted on the bracket (8).

9. The airway test bench mirror device according to claim 8, characterized in that: The reflector adjustment assembly (7) comprises a rotational displacement stage (71) and an inclination displacement stage (72). The rotational displacement stage (71) is mounted on the base (1) and is located at the center of the mirror container (2). The rotation axis of the rotational displacement stage (71) coincides with the vertical center axis of the mirror container (2). The inclination displacement stage (72) is mounted on the rotating movable end of the rotational displacement stage (71). The bracket (8) is mounted on the inclination movable end of the inclination displacement stage (72) to adjust the inclination angle of the reflector (6) on the bracket (8).

10. An engine cylinder head airway testing system, characterized in that: The invention comprises a tracer particle generator (20), a tracer particle input pipe (30), a blower (40), a voltage stabilizer (50), an exhaust pipe (60) and an airway test bench mirror device as described in any one of claims 1 to 9, wherein the cylinder head sample (10) is fixed to the top of the simulated cylinder liner (4), the tracer particle generator (20) passes through the cylinder head sample (10) through the tracer particle input pipe (30) and is connected to the simulated cylinder liner (4) to input tracer particles into the simulated cylinder liner (4), the blower (40) and the voltage stabilizer (50) are connected to the ventilation pipe (3) in turn through the exhaust pipe (60) to suck the mirror container (2) and the simulated cylinder liner (4) to form a stable flowing airflow.

Images