Temperature and pressure control constant volume bomb with replaceable window

Abstract

The temperature and pressure control constant volume bomb comprises an upper end cover, a main body window and a lower end cover, the main body window is provided with a window opening, and the main body window is detachably connected between the upper end cover and the lower end cover; a plurality of connecting screws are fixed to the edge of the lower end cover, the ends, away from the lower end cover, of the connecting screws penetrate through the edge of the upper end cover, the upper end cover is slidably connected with the connecting screws, and the ends, penetrating out of the mounting plate, of the connecting screws are in threaded connection with locking nuts; the main body window is located between the upper end cover and the lower end cover, and the main body window can be clamped and fixed between the upper end cover and the lower end cover by screwing the locking nut. A replaceable three-section split design is adopted, a plurality of groups of replaceable windows are configured, various diagnosis requirements can be met by utilizing a single-capacity bomb, and the spray optical diagnosis test cost is remarkably reduced; and the temperature and pressure in the constant volume bomb are adjustable, airflow is uniform and controllable, airflow movement in the constant volume bomb can be efficiently organized, and an airflow dead zone is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of optical diagnostic equipment, and in particular to a temperature-controlling, pressure-controlling and volume-regulating bomb with a replaceable window. Background Art

[0002] In the development of hybrid engine combustion systems, optical diagnosis of fuel spray is the cornerstone of combustion model calibration. Constant volume bomb, as an experimental device that can simulate the thermodynamic boundary conditions in the cylinder of an actual internal combustion engine, is a necessary experimental equipment for spray optical diagnosis.

[0003] Different optical diagnostic methods require different optical path arrangements. For example, the Mie scattering method used for spray morphology testing requires two windows with an angle of 90°, while the phase Doppler interferometry method requires two windows with an angle of 135°. If the oil film hitting the wall needs to be measured, high and low windows need to be arranged on the bomb, and the low window cooperates with a 45° reflector to realize the arrangement of the optical path hitting the wall and the collection of the fluorescence signal of the oil film. This puts higher requirements on the versatility of the bomb.

[0004] However, most of the existing bombs have fixed windows. For example, the bomb proposed by patent authorization announcement number CN106353098B can only achieve an optical arrangement of 180°. Although the bomb proposed by patent authorization announcement number CN106441912B has 6 bomb windows, the window angles are all 90° or 180°, which cannot achieve the 135° optical configuration required by the phase Doppler test and the high and low window configuration required for the wall-impacting oil film measurement. The bomb of patent authorization announcement number CN103926196B is small in size, making it difficult to measure the wall-impacting oil film, and uses an air intake hole to intake air, with a single air intake position, which is easy to form a dead zone in the bomb, making it difficult to effectively organize the airflow movement in the bomb. In terms of scavenging of the bomb container, although the fixed volume bomb with patent authorization announcement number CN106441912B can achieve multi-hole air intake scavenging, the air inlet is installed vertically on the wall of the bomb container, and the air flow enters the bomb container radially. The intake gas needs to be deflected inside the bomb container before it can be discharged from the bottom exhaust hole, which makes it easy for the air flow inside the bomb container to form a dead zone, making it difficult to efficiently organize the air flow movement inside the bomb container.

[0005] Therefore, with respect to the above-mentioned prior art, the inventors believe that the existing constant volume bomb has poor intake and exhaust uniformity, there are dead zones in the airflow within the constant volume bomb, and the airflow organization efficiency is low; and the test function of the constant volume bomb is limited, making it difficult to meet different optical diagnostic needs. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a temperature-controlled, pressure-controlled, constant-volume bomb with replaceable windows. The bomb adopts a three-section split design and is equipped with multiple groups of replaceable windows. A single bomb can meet various diagnostic needs, significantly reducing the cost of spray optical diagnostic testing. The temperature and pressure inside the constant-volume bomb are adjustable, and the airflow is uniform and controllable, which can efficiently organize the airflow movement inside the constant-volume bomb and avoid the occurrence of airflow dead zones.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a temperature-controlling, pressure-controlling and constant-volume bomb with a replaceable window, comprising an upper end cover, a main body window and a lower end cover, wherein a window window is arranged on the main body window, and the main body window is detachably connected between the upper end cover and the lower end cover; a plurality of connecting screws are fixed to the edge of the lower end cover, and one end of the connecting screw away from the lower end cover is passed through the edge of the upper end cover, the upper end cover is slidably connected to the connecting screw, and one end of the connecting screw passing through the mounting plate is threadedly connected with a locking nut; the main body window is located between the upper end cover and the lower end cover, and the main body window can be clamped and fixed between the upper end cover and the lower end cover by tightening the locking nut.

[0008] Furthermore, the main body window is provided with three window windows, and the three window windows are arranged along the circumference of the main body window. The main body window has a variety of configurations and can be replaced according to test requirements.

[0009] Furthermore, the main body window is hollow inside and forms a test space, and a temperature sensor, a pressure sensor and a heater are arranged in the main body window.

[0010] Furthermore, the lower end cover includes a cylinder seat and a connecting plate coaxially fixed to the bottom surface of the cylinder seat, and the connecting screw is fixed to the edge of the connecting plate; the end surface of the cylinder seat close to the main body window is provided with a sealing groove, and an O-ring is provided in the sealing groove.

[0011] Furthermore, an air inlet pipeline and an air outlet pipeline are provided outside the constant volume bomb, one end of the air inlet pipeline passes through the upper end cover and extends into the test space, the end of the air inlet pipeline that penetrates into the test space is connected to a scavenging disk, an annular air duct is provided in the scavenging disk, the air inlet pipeline is connected with the annular air duct, and a plurality of scavenging holes connected with the annular air duct are provided on the bottom surface of the scavenging disk away from the air inlet pipeline, and the plurality of scavenging holes are evenly distributed along the circumference of the scavenging disk.

[0012] Furthermore, one end of the air intake pipeline penetrating into the test space is communicated with the annular air passage of the scavenging disk and is relatively fixed to the scavenging disk. The height position of the scavenging disk in the test space is adjustable.

[0013] Furthermore, an air guide funnel is provided on the inner side of the cylinder seat, the air guide funnel is located at the bottom of the scavenging disk, the diameter of the air guide funnel decreases in the direction away from the main body window, and the bottom end of the air guide funnel is connected to the air outlet pipeline.

[0014] Beneficial effects of the present invention:

[0015] 1. The replaceable three-section split design is adopted, the window part can be replaced as a whole, and the main window with a variety of different window designs can be configured. It can be flexibly adjusted according to the needs of diagnostic technology without changing the upper and lower end covers of the constant volume bomb; using a single volume bomb, multi-angle optical measurement can be achieved to meet various spray optical diagnostic needs, which can greatly reduce the cost of experimental testing.

[0016] 2. The temperature and pressure control in the constant volume bomb in the prior art mostly relies on manual adjustment, which is time-consuming and labor-intensive, with low efficiency and large errors. The present invention adopts PID control, and cooperates with temperature sensors, pressure sensors, solenoid valves, vacuum pumps, electric heating wires, etc. to realize intelligent control of temperature and pressure, and can achieve high-precision adjustment of temperature and pressure.

[0017] 3. Compared with the existing constant volume bombs with uneven scavenging, unreasonable air path design, and dead zone problems in the constant volume bombs, the present invention can limit the generation of chamber vortexes and avoid dead zones through the design of scavenging disc and air guide funnel, thus achieving efficient and uniform organized air flow movement; and the height position of the scavenging disc in the test space can be adjusted to achieve different scavenging strategies, thereby meeting different spray test requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is an exploded view of the overall structure of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the scavenging disk in the present invention.

[0021] Figure 4 It is a structural schematic diagram of the lower end cover in the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of different main windows.

[0023] In the figure: 1. upper end cover; 11. injector; 2. main body window; 21. window; 3. lower end cover; 31. connecting plate; 32. cylinder seat; 33. sealing groove; 34. connecting screw; 35. locking nut; 4. scavenging plate; 41. scavenging hole; 42. annular air duct; 5. air guide funnel; 6. air inlet pipe; 7. air outlet pipe. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings.

[0025] The invention discloses a temperature-controlling, pressure-controlling and volume-constant bomb with a replaceable window.

[0026] Reference Figure 1 and Figure 2 A temperature-controlling, pressure-controlling, constant-volume bomb with a replaceable window comprises an upper end cover 1, a main body window 2 and a lower end cover 3. A window window 21 is arranged on the main body window 2. The main body window 2 is detachably connected between the upper end cover 1 and the lower end cover 3. The main body window 2 of this embodiment is made of 45 steel and the outer surface is chrome-plated. A plurality of connecting screws 34 are fixed to the edge of the lower end cover 3, and one end of the connecting screw 34 away from the lower end cover 3 is passed through the edge of the upper end cover 1, and the upper end cover 1 is slidably connected to the connecting screw 34, and one end of the connecting screw 34 passing through the mounting plate is threadedly connected with a locking nut 35; the main body window 2 is located between the upper end cover 1 and the lower end cover 3, and the main body window 2 can be clamped and fixed between the upper end cover 1 and the lower end cover 3 by tightening the locking nut 35, thereby completing the installation of the main body window 2; conversely, loosen the locking nut 35, remove the upper end cover 1 from the connecting screw 34, and then take out the main body window 2, thereby completing the disassembly of the main body window 2.

[0027] The design of the constant volume bomb splits the integral structure of the traditional constant volume bomb into a three-section design of an upper end cover 1, a main body window 2 and a lower end cover 3. The main body window 2 equipped with the window window 21 can be replaced. Using a single volume bomb, multi-angle optical measurement can be achieved to meet various spray optical diagnosis needs, which can greatly reduce experimental costs.

[0028] In this embodiment, the main body window 2 has three windows 21, which are arranged along the periphery of the main body window 2. The three windows 21 are configured in various specifications and positions according to different test requirements. Figure 5 , the window 21 part can be designed as a three-level window of 0°-90°-180°, a three-level window of 0°-90°-225°, or a high and low window. The corresponding windows can be replaced in different spray diagnosis situations to meet different spray diagnosis needs. The three-level window of 0°-90°-180° can meet the requirements of Mie scattering test, the three-level window of 0°-90°-225° can meet the requirements of phase Doppler interferometer test, the low window of the high and low window can realize the bottom view measurement of the oil film hitting the wall, and the high window can meet the observation requirements of the macroscopic morphology of the spray and the process of spray hitting the wall, and the window design is not limited to the above three situations.

[0029] The main body window 2 is hollow inside and forms a test space. The main body window 2 is provided with a temperature sensor, a pressure sensor and a heater, and a PID controller is provided for regulation. The PID controller combines multiple groups of temperature sensors to control the on and off of the internal heater, thereby controlling the internal temperature of the volume bomb; the outside of the constant volume bomb is provided with an air intake pipeline 6 and an exhaust pipeline, and the constant volume bomb is connected to the air source through the air intake pipeline 6 and is connected to the vacuum pump through the exhaust pipeline; the internal pressure of the constant volume bomb is controlled by the PID controller in conjunction with the solenoid valve of the air intake and exhaust pipelines.

[0030] Reference Figure 4 The lower end cover 3 includes a cartridge seat 32 and a connecting plate 31 coaxially fixed to the bottom surface of the cartridge seat 32, and a connecting screw 34 is fixed to the edge of the connecting plate 31; the end surface of the cartridge seat 32 close to the main body window 2 is provided with a sealing groove 33, and an O-ring is provided in the sealing groove 33 to ensure the sealing of the connection. The upper cover body is provided with an injector 11.

[0031] Reference Figure 2 and Figure 3 , one end of the air inlet pipeline 6 passes through the upper end cover 1 and extends into the test space, and the end of the air inlet pipeline 6 that penetrates the test space is connected to the scavenging plate 4, and an annular air passage 42 is provided in the scavenging plate 4, and the air inlet pipeline 6 is connected to the annular air passage 42, and a plurality of scavenging holes 41 connected to the annular air passage 42 are provided on the bottom surface of the scavenging plate 4 away from the air inlet pipe. In this embodiment, eight scavenging holes 41 are provided, and the scavenging holes 41 are evenly distributed along the circumference of the scavenging plate 4. An air guide funnel 5 is provided on the inner side of the cylinder seat 32 of the lower end cover 3, and the air guide funnel 5 is located at the bottom of the scavenging plate 4, and the diameter of the air guide funnel 5 decreases in the direction away from the main body window 2, and the bottom end of the air guide funnel 5 is connected to the air outlet pipeline 7.

[0032] Compared with the existing constant volume bombs with uneven scavenging, unreasonable air path design, and prone to flow dead zones in the constant volume bombs, the present invention can limit the generation of chamber vortexes and avoid flow dead zones through the design of the scavenging disk 4 and the air guide funnel 5, thereby achieving efficient and uniform organized airflow movement.

[0033] Reference Figure 2 and Figure 3 , one end of the air intake pipe 6 that penetrates into the test space is connected to the annular air passage 42 of the scavenging disc 4, the air intake pipe 5 is relatively fixed to the scavenging disc 4, and the height position of the scavenging disc 4 in the test space is adjustable. In order to achieve the purpose of adjusting the height position of the scavenging disc 4, in this embodiment, a replaceable connecting pipe of different lengths is connected to the end of the air intake pipe 6, and a threaded hole for the connecting pipe to pass through and be threadedly connected is opened on the upper end cover 1. The air intake pipe 6 penetrates into the test space through the connecting pipe and is connected to the scavenging disc 4. Then, by replacing connecting pipes of different lengths, the height position of the scavenging disc 4 in the test space is adjusted, thereby achieving different scavenging strategies to meet different spray test requirements.

[0034] For the injector 11, conventional spray tests are performed at the top of the cartridge, such as spray shape and spray particle size tests. At this time, the injection frequency is low (about 1 Hz), and the requirement for the flow field in the cylinder is: after a single injection is completed, the droplets of the last injection are swept out of the cartridge, and the scavenging disk 4 is installed on the top of the inside of the cartridge, with the evenly distributed air outlets, so that the droplets in the cartridge can be efficiently discharged under low air flow conditions.

[0035] For some spray tests that have high requirements for droplet concentration in the test area, such as the wet wall measurement at the tip of the injector 11, the injector 11 is installed on the side of the container, and the test area of ​​the imaging system is the tip of the injector 11. The imaging system needs to collect the wall oil film at the tip of the injector 11 in a very short time after the injection is completed, and the scavenging system is required to quickly sweep the injected fuel away from the nozzle tip in a timely manner. At this time, the scavenging disc 4 is installed in the middle of the container, located slightly above the tip of the sprayer, and with a high airflow rate, the injected fuel can be quickly swept away, ensuring efficient imaging of the test area in a very short time after the injection is completed.

[0036] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A temperature-controlling, pressure-controlling, constant-volume bomb with replaceable windows, characterized in that: The invention comprises an upper end cover (1), a main body window (2) and a lower end cover (3), wherein a window window (21) is arranged on the main body window (2), and the main body window (2) is detachably connected between the upper end cover (1) and the lower end cover (3); a plurality of connecting screws (34) are fixed to the edge of the lower end cover (3), and one end of the connecting screws (34) away from the lower end cover (3) is passed through the edge of the upper end cover (1), and the upper end cover (1) is slidably connected to the connecting screws (34), and one end of the connecting screws (34) passing through the mounting plate is threadedly connected to a locking nut (35); the main body window (2) is located between the upper end cover (1) and the lower end cover (3), and the main body window (2) can be clamped and fixed between the upper end cover (1) and the lower end cover (3) by tightening the locking nut (35).

2. The temperature-controlling, pressure-controlling, constant-volume bomb with replaceable windows according to claim 1, characterized in that: The main body window (2) is provided with three viewing windows (21), and the three viewing windows (21) are arranged along the circumference of the main body window (2). The main body window (2) has a variety of configurations, which can be replaced according to test requirements.

3. A temperature-controlled, pressure-controlled, constant-volume bomb with replaceable windows according to claim 1 or 2, characterized in that: The main body window (2) is hollow inside and forms a test space. A temperature sensor, a pressure sensor and a heater are arranged inside the main body window (2).

4. A temperature-controlling, pressure-controlling, constant-volume bomb with replaceable windows according to claim 1 or 2, characterized in that: The lower end cover (3) comprises a cartridge seat (32) and a connecting plate (31) coaxially fixed to the bottom surface of the cartridge seat (32), and the connecting screw (34) is fixed to the edge of the connecting plate (31); the cartridge seat (32) is provided with a sealing groove (33) on the end surface close to the main body window (2), and an O-ring is provided in the sealing groove (33).

5. The temperature-controlling, pressure-controlling, constant-volume bomb with replaceable windows according to claim 4, characterized in that: An air inlet pipeline (6) and an air outlet pipeline (7) are provided outside the constant volume bomb. One end of the air inlet pipeline (6) passes through the upper end cover (1) and extends into the test space. The end of the air inlet pipeline (6) that passes into the test space is connected to a scavenging disk (4). An annular air passage (42) is provided inside the scavenging disk (4). The air inlet pipeline (6) is connected to the annular air passage (42). A plurality of scavenging holes (41) connected to the annular air passage (42) are provided on the bottom surface of the scavenging disk (4) away from the air inlet pipeline. The plurality of scavenging holes (41) are evenly distributed along the circumference of the scavenging disk (4).

6. The temperature-controlling, pressure-controlling, constant-volume bomb with replaceable windows according to claim 5, characterized in that: One end of the air inlet pipeline (6) that penetrates into the test space is communicated with the annular air passage (42) of the scavenging disc (4) and is relatively fixed to the scavenging disc (4). The height position of the scavenging disc (4) in the test space is adjustable.

7. The temperature-controlling, pressure-controlling, constant-volume bomb with replaceable windows according to claim 6, characterized in that: An air guide funnel (5) is arranged on the inner side of the cylinder seat (32). The air guide funnel (5) is located at the bottom of the scavenging disc (4). The diameter of the air guide funnel (5) decreases in a direction away from the main body window (2). The bottom end of the air guide funnel (5) is connected to the air outlet pipeline (7).

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