A replaceable optical engine piston head and its use method

Abstract

The present invention discloses a replaceable optical engine piston head and a method for using the same, including a piston base, a replaceable piston and a piston pressure plate, wherein the replaceable piston is installed in the piston base and fixed by the piston pressure plate; the replaceable piston includes a central concave combustion portion and a mounting flange at the bottom, the piston pressure plate fixes the replaceable piston by the mounting flange, and the replaceable piston includes a group of piston monomers that can be replaced with each other, and the shape of the combustion portion of the piston monomer is processed according to the test requirements. Beneficial effects: The present invention can use different piston top surfaces to meet the research on the combustion chamber structure and compression ratio; there is no indirect contact between the piston pressure plate and the top of the piston monomer; there is a pre-tightened clearance fit between the piston pressure plate and the piston base to reduce bolt wear.

Description

Technical Field

[0001] The invention relates to a component of an optical engine and a use method thereof, and in particular to a replaceable optical engine piston head and a use method thereof, belonging to the technical field of optical engines. Background Art

[0002] In order to mitigate global warming, my country strives to peak carbon dioxide emissions by 2030 and achieve carbon neutrality by 2060. The "dual carbon" policy has put forward higher requirements for energy conservation and emission reduction of internal combustion engines, so the combustion phenomenon and pollutant generation process in the combustion chamber of the internal combustion engine are particularly important.

[0003] Nowadays, optical diagnostic technology is developing rapidly, and optical engines as application carriers have emerged. Optical engines can visualize the flow of gas, flame propagation, droplet spray, etc. in the cylinder by setting a quartz window at the bottom of the combustion chamber and combining it with laser and high-speed digital technology. This has great guiding significance for understanding the actual working process in the cylinder of the internal combustion engine and optimizing the combustion mode.

[0004] At present, the quartz piston heads of optical engines are mostly flat or slightly concave, while the piston heads of actual engines are mostly bowl-shaped or ω-shaped. The experimental data obtained using flat or slightly concave shapes has certain limitations for the development and optimization of real engines.

[0005] Chinese invention patent 113464308A discloses a transparent piston head at the top of a piston in an optical engine, but the patent has some shortcomings: 1. A gasket is usually installed between the piston pressure plate and the top of the quartz piston, and the high temperature and high pressure environment in the combustion chamber will cause the gasket to break, which will lead to direct contact between the piston pressure plate and the top of the quartz piston, causing the quartz glass to break. 2. Under this matching structure of the piston pressure plate and the quartz piston, when a combustion chamber structure of a different shape is selected, the piston pressure plate, quartz piston and gasket can only be replaced as a whole set, which makes the process cost more complicated and it is difficult to ensure good air tightness in the combustion chamber. 3. The locking bolt is locked from bottom to top, and there is considerable vibration when the engine is running, and there is a risk of the bolt falling off. And it only relies on its shear force to limit the degree of freedom, which is easy to cause thread wear and structural damage after frequent disassembly. Summary of the invention

[0006] Purpose of the invention: The purpose of the present invention is to address the problems existing in the prior art and to propose a replaceable optical engine piston head and a method of using the same. The present invention can use different piston top surfaces to meet the research on the combustion chamber structure and compression ratio. Secondly, there is no indirect contact between the piston pressure plate and the replaceable piston top surface in the present invention. When studying the effects of different piston structures on ignition and combustion, it is only necessary to replace the piston head without customizing the gasket. In addition, there is a pre-tightened clearance fit between the piston pressure plate and the piston pressure plate base to reduce bolt wear. The inconvenience caused by replacing the entire set of piston cover plates, quartz pistons and gaskets is solved.

[0007] Technical solution: A replaceable optical engine piston head, including a piston base, a replaceable piston and a piston pressure plate, wherein the replaceable piston is installed in the piston base and fixed by the piston pressure plate; the replaceable piston includes a central concave combustion portion and a mounting flange at the bottom, and the piston pressure plate fixes the replaceable piston by the mounting flange, and the replaceable piston includes a group of piston monomers that can be replaced with each other, and the shape of the combustion portion of the piston monomer is processed according to test requirements.

[0008] The present invention satisfies the research requirements on the combustion chamber structure and the compression ratio by replacing piston monomers with combustion parts of different shapes. When studying the influence of different piston structures on ignition and combustion, only the piston monomer needs to be replaced.

[0009] Preferably, in order to further study the needs of common combustion part structures, the shapes of the combustion part of the piston monomer include ω-shaped, bowl-shaped, spherical and U-shaped structures. By replacing the piston monomer, the effects of different combustion part structures on ignition and combustion under the same conditions can be realized, making the test more comparable.

[0010] Preferably, in order to avoid direct contact between the piston pressure plate and the top surface of the replaceable piston, at least two reserved grooves are evenly distributed on the inner wall of the piston base, and a locking groove is provided on the same side of the bottom of each reserved groove along the circumferential direction of the inner diameter, and the reserved groove extends vertically downward along the axial direction from the upper end surface of the piston base, and the locking groove is connected with the reserved groove, and the bottom surface of the locking groove is flush with the bottom surface of the reserved groove;

[0011] The piston pressure plate is a flange structure, the inner diameter of which is larger than the outer diameter of the replaceable piston, and comprises a flange plate and a flange neck. The outer diameter of the flange neck is provided with raised portions in the circumferential direction in the same number as the reserved grooves and in corresponding positions. The raised portions pass through the reserved grooves and enter the locking grooves. The lower bottom surface of the flange plate contacts the upper end surface of the piston base, and the lower end surface of the flange neck contacts the upper surface of the mounting flange.

[0012] There is no indirect contact between the piston pressure plate and the top surface of the replaceable piston in the present invention, which reduces the risk of quartz glass breakage due to engine vibration or gasket damage; when studying the effects of different piston structures on ignition and combustion, only the piston monomer needs to be replaced, and no customized gasket is required; and the replaceable piston can be quickly replaced through the cooperation between the protrusion and the locking groove.

[0013] Preferably, in order to alleviate the impact between the piston pressure plate and the mounting flange and to adjust the preload force during installation, an upper adjustment pad is provided between the lower end surface of the flange neck and the upper surface of the mounting flange.

[0014] Preferably, in order to alleviate the impact between the piston base and the replaceable piston bottom and to adjust the flatness of the piston base when in contact with the replaceable piston bottom, a lower adjustment pad is provided between the replaceable piston bottom and the piston base.

[0015] Preferably, in order to improve the connection reliability between the piston pressure plate and the piston base, at least two mounting countersunk holes are evenly distributed on the circumferential surface of the flange of the piston pressure plate, and the upper end surface of the piston base is provided with threaded holes whose number and positions correspond to the mounting countersunk holes, and the piston pressure plate is fixed to the end of the piston base by bolts.

[0016] A method for using a replaceable optical engine piston head comprises the following steps:

[0017] Step 1: Install the piston. First, install the lower adjustment pad in the hollow area of ​​the piston base. Then install the replaceable piston in the hollow area of ​​the piston base and fix it, and then proceed to step 2.

[0018] Step 2: Install the piston pressure plate. First, install the upper adjustment pad on the upper surface of the mounting flange of the replaceable piston. Slide the raised portion of the piston pressure plate into the bottom of the piston base along the reserved groove. Rotate the piston pressure plate horizontally so that the raised portion enters the locking groove to achieve pre-tightening. Then, lock the piston pressure plate and the piston base with bolts. The installation is complete.

[0019] Step 3: Replace the piston. Reverse steps 2 to 1 to remove the piston, and then repeat steps 1 to 2 to replace it.

[0020] Beneficial effects: The present invention can use different piston top surfaces to meet the research on combustion chamber structure and compression ratio; there is no indirect contact between the piston pressure plate and the replaceable piston top surface in the present invention, and when studying the influence of different piston structures on ignition and combustion, it is only necessary to replace the piston monomer, and no customized gasket is required; there is no indirect contact between the piston pressure plate and the top of the piston monomer; there is a pre-tightened clearance fit between the piston pressure plate and the piston base, which reduces bolt wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 It is a cross-sectional view of the present invention when installed;

[0023] Figure 2 It is a structural schematic diagram of the piston base of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the piston pressure plate of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] like Figure 1As shown, a replaceable optical engine piston head includes a piston base 1, a replaceable piston 2 and a piston pressure plate 3. The replaceable piston 2 is installed in the piston base 1 and fixed by the piston pressure plate 3. The replaceable piston 2 includes a central concave combustion portion 21 and a mounting flange 22 at the bottom. The piston pressure plate 3 fixes the replaceable piston 2 by the mounting flange 22. The replaceable piston 2 includes a group of piston monomers that can be replaced with each other. The shape of the combustion portion 21 of the piston monomer is processed according to the test requirements.

[0029] The present invention satisfies the research requirements on the combustion chamber structure and compression ratio by replacing piston monomers with combustion parts 21 of different shapes. When studying the influence of different piston structures on ignition and combustion, only the piston monomer needs to be replaced.

[0030] In order to further study the needs of common combustion part 21 structures, the shapes of the combustion part 21 of the piston monomer include ω-shaped, bowl-shaped, spherical and U-shaped structures. By replacing the piston monomer, the effects of different combustion part 21 structures on ignition and combustion can be realized under the same conditions, making the test more comparable.

[0031] In order to alleviate the impact between the piston pressure plate 3 and the mounting flange 22 and to adjust the preload force during installation, an upper adjustment pad 4 is provided between the lower end surface of the flange neck 32 and the upper surface of the mounting flange 22 .

[0032] In order to alleviate the impact between the piston base 1 and the bottom of the replaceable piston 2 and to adjust the flatness of the piston base 1 when they are in contact with the bottom of the replaceable piston 2 , a lower adjustment pad 5 is provided between the bottom of the replaceable piston 2 and the piston base 1 .

[0033] like Figure 2 and 3 As shown, in order to prevent the piston pressure plate 3 from directly contacting the top surface of the replaceable piston 2, four reserved grooves 11 are evenly distributed on the inner wall of the piston base 1, and a locking groove 12 is provided along the inner diameter circumferential direction on the same side of the bottom of each reserved groove 11, and the reserved groove 11 extends vertically downward from the upper end surface of the piston base 1 in the axial direction, and the locking groove 12 is connected with the reserved groove 11 and the bottom surface of the locking groove 12 is flush with the bottom surface of the reserved groove 11;

[0034] The piston pressure plate 3 is a flange structure, the inner diameter of which is larger than the outer diameter of the replaceable piston 2, and includes a flange 31 and a flange neck 32. The outer diameter of the flange neck 32 is circumferentially provided with raised portions 33 whose number is the same as the number of the reserved grooves 11 and whose positions correspond to each other. The raised portions 33 pass through the reserved grooves 11 and enter the locking grooves 12. The lower bottom surface of the flange 31 contacts the upper end surface of the piston base 1, and the lower end surface of the flange neck 32 contacts the upper surface of the mounting flange 22.

[0035] There is no indirect contact between the piston pressure plate 3 and the top surface of the replaceable piston 2 in the present invention, which reduces the risk of quartz glass breakage due to engine vibration or gasket damage; when studying the effects of different piston structures on ignition and combustion, only the piston unit needs to be replaced, and no customized gasket is required; and the replaceable piston 2 can be quickly replaced by cooperating between the protrusion 33 and the locking groove 12.

[0036] In order to improve the connection reliability between the piston pressure plate 3 and the piston base 1, at least two mounting countersunk holes 34 are evenly distributed on the circumferential surface of the flange 31 of the piston pressure plate 3, and the upper end surface of the piston base 1 is provided with threaded holes 13 whose number and position correspond to the mounting countersunk holes 34, and the piston pressure plate 3 is fixed to the end of the piston base 1 by bolts.

[0037] A method for using a replaceable optical engine piston head comprises the following steps:

[0038] Step 1: Install the piston. First, install the lower adjustment pad 5 in the hollow area of ​​the piston base 1; then install the replaceable piston 2 in the hollow area of ​​the piston base 1 and fix it, and then proceed to step 2;

[0039] Step 2: Install the piston pressure plate. First, install the upper adjustment pad 4 on the upper surface of the mounting flange 22 of the replaceable piston 2. Slide the raised portion 33 of the piston pressure plate 3 along the reserved groove 11 of the piston base 1 into its bottom. Rotate the piston pressure plate 3 horizontally so that the raised portion 33 enters the locking groove 12 to achieve pre-tightening. Then, lock the piston pressure plate 3 and the piston base 1 with bolts. The installation is completed.

[0040] Step 3: Replace the piston. Reverse steps 2 to 1 to remove the piston, and then repeat steps 1 to 2 to replace it.

[0041] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined in this specification may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A replaceable optical engine piston head, characterized in that: It comprises a piston base (1), a replaceable piston (2) and a piston pressure plate (3), The replaceable piston (2) is installed in the piston base (1) and fixed by a piston pressure plate (3). The replaceable piston (2) comprises a central concave combustion portion (21) and a mounting flange (22) at the bottom. The piston pressure plate (3) fixes the replaceable piston (2) via the mounting flange (22). The replaceable piston (2) comprises a group of piston monomers that can be replaced with each other, and the shape of the combustion part (21) of the piston monomer is processed according to the test requirements; At least two reserved grooves (11) are evenly distributed on the inner wall of the piston base (1), and a locking groove (12) is provided on the same side of the bottom of each reserved groove (11) along the inner diameter circumferential direction, the reserved groove (11) extends vertically downward from the upper end surface of the piston base (1) along the axial direction, the locking groove (12) is connected to the reserved groove (11), and the bottom surface of the locking groove (12) is flush with the bottom surface of the reserved groove (11); The piston pressure plate (3) is a flange structure. The inner diameter of the piston pressure plate (3) is larger than the outer diameter of the replaceable piston (2). The piston pressure plate (3) comprises a flange (31) and a flange neck (32). The flange neck (32) is provided with raised portions (33) in the circumferential direction of the outer diameter, the number of which is the same as the number of the reserved grooves (11) and the positions of which are corresponding. The raised portions (33) pass through the reserved grooves (11) and enter the locking grooves (12). The lower bottom surface of the flange (31) contacts the upper end surface of the piston base (1), and the lower end surface of the flange neck (32) contacts the upper surface of the mounting flange (22).

2. The replaceable optical engine piston head according to claim 1, characterized in that: The shape of the combustion portion (21) of the piston monomer includes an ω-shaped, bowl-shaped, spherical and U-shaped structure.

3. The replaceable optical engine piston head according to claim 1, characterized in that: An upper adjustment pad (4) is provided between the lower end surface of the flange neck (32) and the upper surface of the mounting flange (22).

4. The replaceable optical engine piston head according to claim 1, characterized in that: A lower adjustment pad (5) is provided between the bottom of the replaceable piston (2) and the piston base (1).

5. The replaceable optical engine piston head according to claim 1, characterized in that: At least two mounting countersunk holes (34) are evenly distributed on the circumferential surface of the flange (31) of the piston pressure plate (3); the upper end surface of the piston base (1) is provided with threaded holes (13) whose number and positions correspond to the mounting countersunk holes (34); and the piston pressure plate (3) is fixed to the end of the piston base (1) by bolts.

6. A method for using the replaceable optical engine piston head according to claim 1, characterized in that: The following steps are involved: Step 1: Install the piston. First, install the lower adjustment pad (5) in the hollow area of ​​the piston base (1); then install the replaceable piston (2) in the hollow area of ​​the piston base (1) and fix it, and then proceed to step 2; Step 2: Install the piston pressure plate. First, install the upper adjustment pad (4) on the upper surface of the mounting flange (22) of the replaceable piston (2). Slide the raised portion (33) of the piston pressure plate (3) along the reserved groove (11) of the piston base (1) into its bottom. Rotate the piston pressure plate (3) horizontally so that the raised portion (33) enters the locking groove (12) to achieve pre-tightening. Then, lock the piston pressure plate (3) and the piston base (1) with bolts. The installation is completed. Step 3: Replace the piston. Reverse steps 2 to 1 to remove the piston, and then repeat steps 1 to 2 to replace it.

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