In-cylinder explosion pressure measuring device and high-explosion-pressure engine thereof

Abstract

The invention provides an in-cylinder explosion pressure measuring device and a high detonation pressure engine thereof, and the device comprises a detonation pressure bushing which is connected with a cylinder sleeve and is internally provided with a through hole, the through hole is communicated with a cylinder combustion chamber, and the through hole is composed of a detonation pressure channel, a fuel gas pool and a containing cavity; and the detonation pressure sensor is arranged in the containing cavity, and high-temperature fuel gas in a combustion chamber of the air cylinder is introduced into the fuel gas pool through the detonation pressure channel, so that the detonation pressure sensor carries out pressure sampling. The measuring device can meet the requirement that the explosion pressure sensor cannot directly measure the explosion pressure, the explosion pressure is measured through the explosion pressure channel and the fuel gas pool arranged in the explosion pressure lining, it can be guaranteed that the compression ratio in a cylinder cannot be changed to the maximum limit, and then the technical effect of accurately measuring the explosion pressure is achieved.

Description

Technical Field

[0001] This application belongs to the technical field of diesel engine systems, and particularly relates to an in-cylinder explosion pressure measurement device and a high explosion pressure engine thereof. Background Art

[0002] During the operation of a diesel engine, the highest pressure of the working medium in the cylinder is called the highest explosion pressure, which is one of the important working parameters of the diesel engine and has a great impact on the structure and performance of the diesel engine. By measuring the explosion pressure, it is possible to determine whether the operation of a multi-cylinder diesel engine is balanced; in combination with the exhaust temperature and fuel supply scale, it is possible to determine whether the fuel supply advance angle is reasonable; measuring the explosion pressure can determine whether the fuel supply of a certain cylinder is too large or too small. Therefore, in order to ensure the successful development of the power unit of the opposed-piston two-stroke diesel engine working cycle, the measurement of the explosion pressure is an essential link.

[0003] For a two-stroke diesel engine without a cylinder head, which needs to be installed on a "weak" cylinder liner and needs to seal high-temperature gas and water, the existing measurement devices cannot accurately and reliably measure the explosion pressure. Summary of the Invention

[0004] In view of this, this application aims to propose an in-cylinder explosion pressure measurement device and a high explosion pressure engine thereof to solve the problem of being unable to accurately and reliably measure the explosion pressure.

[0005] To achieve the above object, the technical solution of this application is realized as follows: In a first aspect, this application provides an in-cylinder explosion pressure measurement device, including: An explosion pressure bushing, which is connected to the cylinder liner and has a through hole opened inside. The through hole is communicated with the cylinder combustion chamber. Among them, the through hole is composed of an explosion pressure channel, a gas pool, and a receiving cavity; An explosion pressure sensor, which is arranged in the receiving cavity. The high-temperature gas in the cylinder combustion chamber is introduced into the gas pool through the explosion pressure channel, so that the explosion pressure sensor performs pressure sampling.

[0006] Further, internal threads are provided on the inner wall of the receiving cavity, and external threads and signal lines that cooperate with the internal threads in the receiving cavity are provided on the explosion pressure sensor; One end of the gas pool is communicated with the receiving cavity, and the other end is communicated with the explosion pressure channel through a deformation structure.

[0007] Further, external threads are provided at the bottom of the explosion pressure bushing and are threadedly connected to the cylinder liner; A serrated structure for facilitating the tightening of the explosion pressure bushing is provided at the top of the explosion pressure bushing.

[0008] Further, a gasket is provided between the root of the external thread of the explosion pressure bushing and the cylinder liner to prevent water in the water cavity of the cylinder liner from seeping into the cylinder combustion chamber.

[0009] Further, the gasket is annealed in a vacuum furnace, and after annealing, the hardness is 35-45 HV, and the parallelism of the upper and lower surfaces is 0.03.

[0010] Further, an O-ring groove is formed in the outer wall of the explosion pressure bushing, and an O-ring is sleeved in the O-ring groove. The O-ring is located between the explosion pressure bushing and the engine body to prevent water in the water cavity from seeping out along the explosion pressure bushing.

[0011] Further, the O-ring is an O-ring seal, and the explosion pressure bushing, the gasket, and the O-ring seal are all made of high-temperature resistant materials.

[0012] In a second aspect, the present application also provides a high explosion pressure engine, including the measuring device as described in the first aspect.

[0013] Compared with the prior art, the in-cylinder explosion pressure measuring device and the high explosion pressure engine of the present application have the following beneficial effects: The in-cylinder explosion pressure measuring device and the high explosion pressure engine of the present application have a compact structure and high space utilization rate, and can maximize the effect of accurately measuring the explosion pressure without changing the compression ratio in the cylinder; at the same time, the measuring device is easy to process and manufacture, reducing the manufacturing cost of the diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings: Figure 1 is a detailed cross-sectional view of an in-cylinder explosion pressure measuring device according to an embodiment of the present application; Figure 2 is a cross-sectional view of the explosion pressure bushing according to an embodiment of the present application; Figure 3 is a side view of the explosion pressure bushing according to an embodiment of the present application; Figure 4 is a cross-sectional view of the gasket according to an embodiment of the present application; Figure 5 is an overall cross-sectional view of an in-cylinder explosion pressure measuring device according to an embodiment of the present application.

[0015] Description of the reference numerals: 1 - Explosion - pressure bushing; 11 - Explosion - pressure channel; 12 - Combustion gas pool; 13 - Accommodation cavity; 14 - Serrated structure; 15 - O - ring groove; 2 - Explosion - pressure sensor; 3 - Body; 4 - Cylinder liner; 41 - Water cavity; 5 - Combustion chamber; 6 - Sealing ring; 7 - Gasket. Detailed implementation manners

[0016] To make the objectives, technical solutions and advantages of the present application clearer and more understandable, the following further elaborates on the present application in detail with reference to specific embodiments and the accompanying drawings.

[0017] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those of ordinary skill in the field to which the present application belongs. The "first", "second" and similar terms used in the embodiments of the present application do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0018] Please refer to Figure 1 and Figure 5 As shown in the figure, this embodiment provides an in - cylinder explosion - pressure measuring device, including: An explosion - pressure bushing 1, the explosion - pressure bushing 1 is connected to the cylinder liner 4 and has a through - hole opened inside, and the through - hole is communicated with the cylinder combustion chamber 5. Among them, as Figure 2 shown in the figure, the through - hole is composed of an explosion - pressure channel 11, a combustion gas pool 12 and an accommodation cavity 13; An explosion - pressure sensor 2, the explosion - pressure sensor 2 is arranged in the accommodation cavity 13, and the high - temperature combustion gas in the cylinder combustion chamber 5 is introduced into the combustion gas pool 12 through the explosion - pressure channel 11, so that the explosion - pressure sensor 2 can perform pressure sampling.

[0019] Specifically, in this embodiment, by setting the explosion - pressure bushing 1, the installation requirements of explosion - pressure sensors 2 with different specifications can be met, playing a role of transfer, and solving the problems of non - installation and sealing caused by the mismatch between the explosion - pressure sensor 2 and the assembled parts. In addition, by opening a through - hole structure composed of an explosion - pressure channel 11, a combustion gas pool 12 and an accommodation cavity 13 inside the explosion - pressure bushing 1, and measuring the explosion pressure through the explosion - pressure channel 11 of the explosion - pressure bushing 1, it can ensure to the greatest extent that the compression ratio in the cylinder will not be changed.

[0020] The in-cylinder explosion pressure measuring device described in this embodiment has a compact structure and high space utilization rate, and can ensure the effect of accurately measuring the explosion pressure to the greatest extent without changing the compression ratio in the cylinder. At the same time, this measuring device is easy to process and manufacture, reducing the manufacturing cost of the diesel engine.

[0021] In some embodiments, as Figure 5 shown, internal threads are provided on the inner wall of the accommodating cavity 13, and external threads and signal lines that are matched with the internal threads in the accommodating cavity 13 are provided on the explosion pressure sensor 2; One end of the gas pool 12 is communicated with the accommodating cavity 13, and the other end is communicated with the explosion pressure channel 11 through a deformation structure.

[0022] Specifically, in this embodiment, this measuring device can solve the problem that the explosion pressure sensor 2 cannot directly measure the explosion pressure. It is introduced into the gas pool 12 through the explosion pressure channel 11 of the explosion pressure bushing 1. After the explosion pressure sensor 2 is affected by the explosion pressure in the cylinder liner 4, different electrical signals are output. The electronic control acquisition system outputs the corresponding explosion pressure through the conversion of the electrical signals. Therefore, it can effectively measure the explosion pressure and can ensure to the greatest extent that the compression ratio in the cylinder will not be changed.

[0023] Through the transition function of the explosion pressure sensor 2 bushing, the service life of the cylinder liner 4 can be improved, avoiding frequent replacement, damaging the cylinder liner 4, affecting the installation and high-pressure sealing performance, and improving the economy of the engine.

[0024] In some embodiments, external threads are provided at the bottom of the explosion pressure bushing 1 and are threadedly connected to the cylinder liner 4; As Figure 2 and Figure 3 shown, a serrated structure 14 for facilitating the tightening of the explosion pressure bushing 1 is provided at the top of the explosion pressure bushing 1.

[0025] Specifically, in this embodiment, in this application, external threads are provided at the bottom of the explosion pressure bushing 1 and are connected in a matching manner with the internal threads provided in the cylinder liner 4. A serrated structure is provided at the top of the explosion pressure bushing 1. The explosion pressure sensor 2 bushing is screwed into the cylinder liner 4 through the serrated structure. The explosion pressure bushing 1 presses the sealing gasket 7 (ductile material) with a tightening torque of 20 N·m, so that the sealing gasket 7 is tightly pressed and sealed with the bottom of the bushing and the joint surface of the cylinder liner.

[0026] In some embodiments, a sealing gasket 7 is provided between the root of the external threads of the explosion pressure bushing 1 and the cylinder liner 4, which is used to prevent the water in the water chamber 41 of the cylinder liner 4 from seeping into the cylinder combustion chamber 5.

[0027] Specifically, in this embodiment, a gasket 7 is sleeved on the root of the external thread of the explosion pressure bushing 1. The explosion pressure bushing 1 is tightened into the cylinder liner 4. By tightening the explosion pressure bushing 1, a planar sealing band is formed between the gasket 7 made of high-temperature resistant material and the connecting parts at the bottom of the explosion pressure bushing 1 and the cylinder liner 4 to prevent the leakage of high-temperature gas.

[0028] The size of the gasket 7 is determined according to the defined size of the aperture of the engine block 3. The width of the formed sealing band is 1 mm. To ensure that the gasket 7 can seal high-temperature gas, the gasket 7 is annealed in a vacuum furnace. After annealing, the hardness is 35 - 45 HV, and the parallelism of the upper and lower surfaces is ensured to be 0.03. The explosion pressure bushing 1 is tightened with a tightening torque of 20 N·m. By virtue of the ductility characteristic of the gasket 7, the width of the sealing band of the gasket 7 is increased to make the width of the sealing band ≥ 1 mm, ensuring that the sealing band is wide enough to seal high-temperature gas.

[0029] The device described in this embodiment can solve the problem that the existing structure cannot directly install the explosion pressure sensor 2 on the cylinder liner 4 and the engine block 3, solve the problem of the narrow installation space of the explosion pressure sensor 2, and can effectively avoid the phenomenon that the water in the water chamber 41 seeps into the combustion chamber 5 or leaks out from the surface of the cylinder liner 4, thus solving the sealing problem.

[0030] In some embodiments, an O-ring groove 15 is formed on the outer wall of the explosion pressure bushing 1, and an O-ring 6 is sleeved in the O-ring groove 15. The O-ring 6 is located between the explosion pressure bushing 1 and the engine block 3 to prevent the water in the water chamber 41 from seeping out along the explosion pressure bushing 1.

[0031] Specifically, in this embodiment, the explosion pressure bushing 1 is sealed and installed in the O-ring groove 15 through the O-ring 6, and the O-ring 6 is in close fit with the inner wall of the engine block 3 to prevent the water in the water chamber 41 from leaking.

[0032] In some embodiments, the O-ring 6 is an O-ring seal 6, and the explosion pressure bushing 1, the gasket 7, and the O-ring seal 6 are all made of high-temperature resistant materials.

[0033] Specifically, in this embodiment, to ensure the sealing of high-temperature gas and water, the explosion pressure bushing 1, the gasket 7, and the O-ring 6 are made of high-temperature resistant materials, and the O-ring 6 and the gasket 7 must be made of high-temperature resistant and ductile materials, such as rubber. The explosion pressure bushing 1 can be made of alloy structural steel with a hardness of 30 to 35 HRC.

[0034] Based on the same inventive concept, corresponding to the measurement device in any of the above embodiments, the embodiment of the present application also provides a high explosion pressure engine, including the measurement device described in the above embodiment.

[0035] The high explosion pressure engine in the above embodiment is used to implement the corresponding measurement device in any of the foregoing embodiments and has the beneficial effects of the corresponding measurement device embodiment, which will not be elaborated here.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

[0037] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent replacements, improvements, etc., made within the spirit and principles of the embodiments of the present application shall be included within the protection scope of the present application.

Claims

1. A device for measuring in-cylinder explosion pressure, characterized in that: include: An explosion-compression bushing, which is connected to the cylinder sleeve and has a through hole therein, the through hole being connected to the cylinder combustion chamber, wherein the through hole is composed of an explosion-compression channel, a gas pool and a containing cavity; An explosion pressure sensor is arranged in the accommodating cavity. The high-temperature combustion gas in the cylinder combustion chamber is introduced into the gas pool through the explosion pressure channel so that the explosion pressure sensor performs pressure sampling.

2. The measuring device according to claim 1, characterized in that: An internal thread is provided on the inner wall of the accommodating cavity, and an external thread and a signal line matching the internal thread of the accommodating cavity are provided on the explosion pressure sensor; One end of the gas pool is communicated with the accommodating cavity, and the other end is communicated with the explosion pressure channel through a deformation structure.

3. The measuring device according to claim 1, characterized in that: The bottom of the explosion-pressure bushing is provided with an external thread and is threadedly connected to the cylinder sleeve; The top of the explosion-compression bushing is provided with a sawtooth structure for facilitating tightening of the explosion-compression bushing.

4. The measuring device according to claim 3, characterized in that: A sealing gasket is provided between the external thread root of the explosion-compression bushing and the cylinder liner to prevent water in the water cavity of the cylinder liner from penetrating into the cylinder combustion chamber.

5. The measuring device according to claim 4, characterized in that: The sealing gasket is annealed in a vacuum furnace, and the hardness after annealing is 35-45HV, and the parallelism of the upper and lower surfaces is 0.

03.

6. The measuring device according to claim 4, characterized in that: An O-ring groove is formed on the outer wall of the explosion bushing. A sealing ring is sleeved in the O-ring groove. The sealing ring is located between the explosion bushing and the body to prevent water in the water cavity from leaking out along the explosion bushing.

7. The measuring device according to claim 6, characterized in that: The sealing ring is an O-type sealing ring, and the explosion-pressure bushing, sealing gasket, and O-type sealing ring are all made of high-temperature resistant materials.

8. A high explosion pressure engine, characterized in that: Comprising a measuring device as claimed in any one of claims 1 to 7.

Images