Distributed water jacket structure for MJI passive pre-combustion chamber

Abstract

The invention discloses a distributed water jacket structure for an MJI passive pre-combustion chamber, a water jacket body is formed by connecting a first water jacket and a second water jacket, and the second water jacket is distributed on the exhaust side of the water jacket body, so that the water jacket body forms a single-layer water jacket on the air inlet side and forms a double-layer water jacket on the exhaust side; the cooling liquid can effectively flow through the high-temperature area of the exhaust side while ensuring that the low-temperature area of the air inlet side is cooled, and more sufficient cooling is provided for the high-temperature area of the exhaust side in a targeted mode, so that heat dissipation uniformity of the air inlet side and the exhaust side in the water jacket is achieved, heat management of an engine is optimized, and the overall performance and reliability of the water jacket are improved. The first water jacket is provided with air removing holes corresponding to each cylinder area, so that each cylinder area can be independently exhausted, air in the water jacket can be effectively and rapidly exhausted, the cavitation risk is reduced, circulating ribs are distributed on the second water jacket, the water circulation flow speed can be effectively increased, heat dissipation of the exhaust side is enhanced, and the heat dissipation uniformity of the air inlet side and the exhaust side is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile engines, and in particular to a distributed water jacket structure for a passive pre-combustion chamber. Background Art

[0002] MJI is a pre-chamber jet ignition technology that uses a small pre-chamber for ignition to form a series of jets, thereby quickly and evenly igniting the remaining mixture. The passive pre-chamber achieves gas exchange through the pressure difference between the pre-chamber and the main combustion chamber, so that the MJI passive pre-chamber can effectively improve combustion efficiency, improve the effective utilization of fuel energy, and provide working power for the engine.

[0003] In order to control the temperature of the engine during operation and keep it within a reasonable range, a water jacket is usually provided on the engine cylinder head. After the water jacket coolant enters the cylinder head from the cylinder body, it flows from the exhaust side with higher temperature to the intake side with lower temperature. The cylinder head is usually provided with a cylinder head water outlet, and the coolant returns to the water tank through a pipe connecting the cylinder head water outlet.

[0004] A Chinese patent application with publication number CN 114233507 A discloses an engine cylinder head coolant jacket, which provides separate coolant to each cylinder through an upper and lower layered water jacket structure, and the coolant flow between the cylinders does not cause significant interference, thereby improving the cooling uniformity of the cylinders, keeping the cylinder head combustion chamber at a suitable temperature, and reducing the problem of abnormal combustion caused by large temperature differences in the combustion chambers of the cylinders.

[0005] However, the water jacket provided by the above scheme is configured as a double-layer water jacket on both the intake side and the exhaust side, which cannot specifically strengthen the cooling of the high-temperature area on the exhaust side, resulting in uneven heat dissipation on the intake side and the exhaust side in the water jacket, thereby causing uneven temperature distribution in the cylinder head combustion chamber, and increasing the complexity of the engine thermal management system. At the same time, the air in the water jacket cannot be discharged in a timely and effective manner, causing cavitation, affecting the heat dissipation of the cylinder head, and the existing cylinder head has many external pipes, and the layout of the water jacket is difficult and the structure is complex.

[0006] Therefore, how to effectively enhance the heat dissipation and cooling effect on the exhaust side of the water jacket, improve the heat dissipation uniformity on the intake and exhaust sides of the water jacket, and promptly and quickly discharge the air in the water jacket, reduce the water pipe layout around the cylinder head, and make the cylinder head water jacket structure simple and reliable has become an urgent problem to be solved in this field. Summary of the invention

[0007] In view of the defects of the prior art, the object of the present invention is to provide a distributed water jacket structure for an MJI passive pre-combustion chamber which has a simple structure, uniform heat dissipation on the air inlet and exhaust sides in the water jacket, and can quickly discharge air.

[0008] In order to achieve the above-mentioned object, the present invention provides a distributed water jacket structure for an MJI passive pre-combustion chamber, wherein the water jacket body is composed of a first water jacket and a second water jacket connected and matched.

[0009] A first flow cavity is formed in the first water jacket, a first surface of the first water jacket is provided with a plurality of water inlets, and a first water outlet extending along the air inlet side of the water jacket body, and a degassing hole and a mounting hole are respectively provided on the second surface of the first water jacket corresponding to each cylinder area.

[0010] The second water jacket is distributed on the exhaust side of the water jacket body and is arranged on the second surface of the first water jacket. A communicating flow channel is provided between the second water jacket and the first water jacket. A second flow cavity is formed in the second water jacket, and flow ribs and a second water outlet extending along the exhaust side are also distributed.

[0011] Furthermore, compression pipes are respectively provided at both ends of the matching area of ​​the first water jacket and the second water jacket, compression holes matching the compression pipes are provided at both ends of the second water jacket, and the compression pipes are connected and matched with the compression holes to form a flow channel.

[0012] Furthermore, the first water jacket and the second water jacket are formed by casting a sand core structure, and the end of the second water jacket and the bottom end of the compression pipe are respectively extended to form sand cleaning holes.

[0013] Furthermore, the water inlets on the first water jacket are evenly distributed around each cylinder area.

[0014] Furthermore, the water inlet includes a first group of water inlets distributed at both ends of each cylinder area, a second group of water inlets distributed outside each cylinder area, and a main water inlet arranged in the corresponding connection area between the first water jacket and the second water jacket.

[0015] Furthermore, the main water inlet has a larger caliber than the first and second water inlet groups, and the first and second water inlet groups are configured to have a smooth caliber.

[0016] Further, the degassing hole extends out of the second surface of the first water jacket.

[0017] Furthermore, a water temperature sensor mounting hole is also provided on the first water jacket.

[0018] Furthermore, the flow rib is composed of a smooth arc-shaped cavity arranged in the second flow cavity, and the flow rib extends to the second water outlet.

[0019] Furthermore, the flow ribs are symmetrically distributed on both sides of the second water outlet.

[0020] The distributed water jacket structure for the MJI passive pre-combustion chamber provided by the present invention comprises a water jacket body which is formed by connecting and cooperating a first water jacket and a second water jacket, and the second water jacket is distributed on the exhaust side of the water jacket body, so that the water jacket body forms a single-layer water jacket on the intake side and a double-layer water jacket on the exhaust side, so that the coolant can more effectively flow through the high-temperature area on the exhaust side while ensuring the cooling of the low-temperature area on the intake side, thereby providing more sufficient cooling for the high-temperature area on the exhaust side in a targeted manner, thereby achieving uniform heat dissipation on the intake side and the exhaust side in the water jacket, and at the same time, optimizing the thermal management of the engine and improving the overall performance and reliability of the water jacket.

[0021] Furthermore, degassing holes are provided on the first water jacket corresponding to each cylinder area, so that each cylinder area can be exhausted independently, effectively and quickly exhausting the air in the water jacket and reducing the risk of cavitation. At the same time, flow ribs are distributed on the second water jacket, which can effectively accelerate the water circulation flow rate, enhance the heat dissipation on the exhaust side, and further improve the heat dissipation uniformity on the intake side and the exhaust side, thereby solving the problem of uneven heat dissipation in the cylinder head combustion chamber on the intake side and the exhaust side. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 The overall schematic diagram of the distributed water jacket structure for the MJI passive pre-combustion chamber provided by the present invention;

[0024] Figure 2 It is a schematic structural diagram of the first water jacket in the present invention;

[0025] Figure 3 It is a schematic structural diagram of the second water jacket in the present invention;

[0026] Figure 4 Schematic diagram of the distribution of water inlets on the first water jacket in the present invention;

[0027] Figure 5 It is a schematic diagram of the flow path of the water jacket structure in the present invention;

[0028] Description of reference numerals:

[0029] 1. Water jacket body 11. Inlet side; 12. Exhaust side;

[0030] 100. First water jacket; 101. First surface; 102. Second surface; 103. Cylinder area; 110. Water inlet; 111. First group of water inlets; 112. Second group of water inlets; 113. Main water inlet; 120. First water outlet; 130. Degassing hole; 140. Mounting hole; 150. Compressing channel; 160. Water temperature sensor mounting hole;

[0031] 200. Second water jacket; 210. Flow channel; 220. Flow ribs; 230. Second water outlet; 240. Pressing hole; 250. Sand cleaning hole. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0033] See also Figure 1 , which shows an example of a distributed water jacket structure for an MJI passive pre-combustion chamber provided by the present invention.

[0034] As can be seen from the figure, in the distributed water jacket structure for the MJI passive pre-combustion chamber of this example, the water jacket body 1 is mainly composed of a first water jacket 100 and a second water jacket 200 connected and matched.

[0035] A first flow cavity is formed in the first water jacket 100, and a plurality of water inlets 110 are distributed on the first surface 101 of the first water jacket 100. A first water outlet 120 is provided on the second surface 102 and extends along the air inlet side 11 of the water jacket body 1. A degassing hole 130 and a mounting hole 140 are respectively provided on the second surface 102 corresponding to each cylinder area 103. Further, the second water jacket 200 is distributed on the exhaust side 12 of the water jacket body 1 and is arranged on the second surface 102 of the first water jacket 100. A flow channel 210 communicating with the first water jacket 100 is provided. A second flow cavity is formed in the second water jacket 200, and flow ribs 220 and a second water outlet 230 are also distributed thereon.

[0036] Thus, the water jacket body 1 forms a single-layer water jacket composed of the first water jacket 100 on the intake side 11, and forms a double-layer water jacket composed of the first water jacket 100 and the second water jacket 200 connected and matched on the exhaust side 12, so that the coolant can cool the low-temperature area of ​​the intake side 11 while being able to flow more effectively through the high-temperature area of ​​the exhaust side 12, thereby providing more targeted cooling for the high-temperature area of ​​the exhaust side 12, thereby achieving uniform heat dissipation on the intake side 11 and the exhaust side 12 in the water jacket body 1, and at the same time, optimizing the thermal management of the engine, improving the overall performance and reliability of the water jacket body, and independently exhausting through the degassing holes 130 corresponding to each cylinder area 103, effectively and quickly exhausting the air in the water jacket, reducing the risk of cavitation, and at the same time, the flow ribs 220 on the second water jacket 200 can effectively accelerate the water circulation flow rate, enhance the heat dissipation on the exhaust side, and further improve the heat dissipation uniformity on the intake side 11 and the exhaust side 12, thereby solving the problem of uneven heat dissipation of the cylinder head combustion chamber on the intake side and the exhaust side.

[0037] Combination Figure 2 and Figure 3In order to ensure that the first water jacket 100 and the second water jacket 200 can be stably connected and matched, and to connect the first flow cavity in the first water jacket 100 and the second flow cavity in the second water jacket 200, so that the coolant can flow in the first water jacket 100 and the second water jacket 200, both ends of the area where the first water jacket 100 and the second water jacket 200 cooperate, that is, both ends of the area of ​​the first water jacket 100 corresponding to the exhaust side 12 are respectively provided with clamping pipes 150 for connecting and matching with the second water jacket 200.

[0038] In coordination therewith, both ends of the second water jacket 200 are provided with compression holes 240 adapted to the compression pipe 150, so that the compression holes 240 of the second water jacket 200 can be inserted into the compression pipe 150 of the first water jacket 100, so that the first water jacket 100 and the second water jacket 200 are fixedly connected, realizing that the water jacket body 1 forms a double-layer water jacket on the exhaust side 12.

[0039] At the same time, the compression pipe 150 is connected to the compression hole 240 to form a flow channel 210 inside, so that the coolant in the first flow cavity of the first water jacket 100 can enter the second flow cavity of the second water jacket 200 through the flow channel 210, so that the coolant forms a double-layer flow on the exhaust side 12, reducing the flow dead zone on the exhaust side 12, so that the coolant can be more evenly distributed and effectively flow through the high-temperature area on the exhaust side 12, thereby specifically strengthening the cooling of the high-temperature area on the exhaust side 12 and improving the cooling efficiency.

[0040] Furthermore, the second water jacket 200 is only distributed on the exhaust side 12 of the water jacket body 1, and is connected to the area of ​​the first water jacket 100 corresponding to the exhaust side 12, so that the intake side 11 of the water jacket body 1 forms a single-layer water jacket, and the exhaust side 12 forms a double-layer water jacket, thereby improving the heat dissipation uniformity of the intake side 11 and the exhaust side 12, while reducing the manufacturing and assembly cost of the water jacket body 1, and making the first water jacket 100 and the second water jacket 200 cooperate to ensure that the engine is maintained within a reasonable operating temperature range, thereby optimizing the thermal management of the engine and improving the overall performance and reliability.

[0041] In order to enable the first water jacket 100 to stably transmit the coolant, a plurality of water inlets 110 are distributed on the first surface 101 of the first water jacket 100 , and the water inlets 110 are evenly distributed around each cylinder area 103 .

[0042] Combination Figure 4As an example, in this embodiment, two cylinder areas 103 are symmetrically distributed on the first water jacket 100, and the water inlets 110 are respectively distributed around the two cylinder areas 103, including a first group of water inlets 111 distributed at both ends of the cylinder area 103, a second group of water inlets 112 distributed outside the cylinder area 103, and a main water inlet 113 arranged in the corresponding connection area between the first water jacket 100 and the second water jacket 200, so that the coolant can enter the first water jacket 100 from the main water inlet 113, the first group of water inlets 111, and the second group of water inlets 112, and flow in the first flow cavity.

[0043] Furthermore, the main water inlet 113 is configured to have a larger diameter than the first group of water inlets 111 and the second group of water inlets 112. The first group of water inlets 111 and the second group of water inlets 112 are distributed on the air intake side 11 of the first water jacket 100, so that the coolant mainly enters the first water jacket 100 from the main water inlet 113. At the same time, the first group of water inlets 111 and the second group of water inlets 112 cooperate with auxiliary water inlet to increase the contact area between the coolant and the first flow cavity, so that the coolant can flow through various parts of the first flow cavity more evenly, optimize the flow path of the coolant, and drive the coolant to flow to the cylinder head, ensuring that the coolant can effectively transfer heat. At the same time, the first group of water inlets 111 and the second group of water inlets 112 are preferably configured with a smooth diameter to play a throttling role.

[0044] In coordination therewith, a first water outlet 120 is further provided on the first surface 101 of the first water jacket 100. Preferably, the first water outlet 120 extends along the air inlet side 11 of the water jacket body 1, and is specifically arranged at the outlet end of the first water jacket 100, so that the coolant flows from the first flow cavity through the air inlet side 11 to cool the air inlet side 11, and then flows out from the first water outlet 120.

[0045] At the same time, since the main water inlet 113 is arranged at the connection area between the first water jacket 100 and the second water jacket 200, after the coolant enters the first water jacket 100 from the main water inlet 113, a part of it flows to the intake side 11, and the other part can quickly flow to the exhaust side 12 and enter the second water jacket 200, thereby effectively cooling the exhaust side 12.

[0046] Specifically, combined Figure 5 The coolant flows in the first flow cavity, flows through the exhaust side 12 , and enters the second flow cavity of the second water jacket 200 through the flow channel 210 , so that the coolant achieves double-layer flow cooling on the exhaust side 12 .

[0047] Furthermore, combined with Figure 3A flow rib 220 is formed on the second water jacket 200. Preferably, the flow rib 220 is composed of a smooth arc-shaped cavity arranged in the second flow cavity to reduce the fluid resistance of the coolant in the second flow cavity, accelerate the water circulation flow rate, and make the coolant form a more uniform flow in the second flow cavity, thereby reducing the dead zone of the coolant during the flow process, ensuring that each part of the exhaust side 12 can be effectively cooled.

[0048] Combination Figure 3 The second water jacket 200 is also provided with a second water outlet 230. Preferably, the second water outlet 230 extends along the exhaust side 12 of the water jacket body 1, and the flow ribs 220 extend to the second water outlet 230 and are distributed on both sides of the second water outlet 230, so that the coolant flows from the second flow cavity through the exhaust side 12 to evenly cool the exhaust side 12, and then flows out from the second water outlet 230.

[0049] The first water jacket 100 and the second water jacket 200 thus constructed can cooperate to achieve single-layer cooling of the coolant in the low-temperature area of ​​the intake side 11 and double-layer cooling of the coolant in the high-temperature area of ​​the exhaust side 12, thereby effectively ensuring the cooling uniformity of the intake side 11 and the exhaust side 12 in the water jacket body 1.

[0050] In order to effectively exhaust the air in the water jacket body 1 and reduce the occurrence of cavitation, a degassing hole 130 is further provided on the second surface 102 of the first water jacket 100. Figure 2 As shown, the degassing holes 130 are respectively arranged on each cylinder area 103, so that the air in each cylinder area 103 can be exhausted independently through the degassing holes 130, thereby improving the exhaust efficiency and effectively exhausting the air in the water jacket body 1.

[0051] Furthermore, the degassing holes 130 are configured to extend out of the second surface 102 of the first water jacket 100 to provide a larger exhaust area, improve exhaust efficiency, and enable the air in the water jacket body 1 to be discharged out of the cylinder head through the degassing holes 130 .

[0052] Furthermore, a mounting hole 140 is provided on the second surface 102 of the first water jacket 100, and the mounting holes 140 are respectively arranged on each cylinder area 103. The MJI passive pre-combustion chamber is connected through the mounting holes 140, so that the first water jacket 100 and the second water jacket 200 are coordinated and distributed around the MJI passive pre-combustion chamber to form a cooling structure, which can effectively cool the MJI passive pre-combustion chamber and ensure a stable operating temperature.

[0053] In this example, the water jacket structure is mainly set on the MJI passive pre-combustion chamber. In other embodiments, the distribution structure of the water inlet and outlet on the first water jacket 100 and the second water jacket 200 is adaptively adjusted, and the water jacket structure can also be set in other combustion chambers through the mounting hole 140.

[0054] Compared with the traditional solution in which a water outlet is arranged on the cylinder head and connected to the water outlet through a pipe, in the water jacket structure, the first water outlet 120 on the first water jacket 100 is directly connected to the cylinder body, and the coolant can flow directly to the cylinder body, thereby reducing the pipe arrangement and ensuring the compactness of the water jacket structure.

[0055] In order to ensure the cooling uniformity of the intake side 11 and the exhaust side 12 in the water jacket body 1, a water temperature sensor mounting hole 160 is further provided on the first water jacket 100 for connecting a water temperature sensor to detect the coolant temperature in the water jacket body 1 to ensure that the heat transfer of the coolant can effectively cool the intake side 11 and the exhaust side 12.

[0056] Further, as an example, the first water jacket 100 and the second water jacket 200 are formed by casting a sand core structure. In order to clean the sand core, the end of the second water jacket 200 and the bottom end of the clamping pipe 150 are respectively extended to form sand cleaning holes 250, so that the sand cleaning holes 250 provide a channel to enter the interior of the first water jacket 100 and the second water jacket 200, which is convenient for cleaning the sand core and ensuring the structural integrity of the first water jacket 100 and the second water jacket 200. Corresponding flow cavities, water inlets and water outlets are respectively formed in the first water jacket 100 and the second water jacket 200, so that the flow cavity and the holes can work stably.

[0057] The following examples illustrate the working process of the present invention in a specific application. It should be noted that the following content is only a specific application example of the present solution and does not constitute a limitation to the present solution.

[0058] Combination Figure 4 and Figure 5 The coolant mainly enters the first water jacket 100 from the main water inlet 113 on the second surface 102 of the first water jacket 100, and a part of the coolant flows to the air inlet side 11. The first group of water inlets 111 and the second group of water inlets 112 can drive the coolant to flow to the air inlet side 11, increase the contact area between the coolant and the first flow cavity, make the coolant flow evenly through each part of the first flow cavity, optimize the flow path of the coolant, and ensure that the coolant can effectively transfer heat.

[0059] Furthermore, the coolant flows from the first flow cavity through the air inlet side 11 to cool the air inlet side 11 , and then flows out from the first water outlet 120 .

[0060] Correspondingly, after the coolant enters the first water jacket 100 from the main water inlet 113 of the first water jacket 100, a part of it flows to the exhaust side 12, and enters the second flow cavity of the second water jacket 200 through the flow channel 210, realizing double-layer flow cooling on the exhaust side 12, and accelerating the water circulation flow rate through the flow ribs 220, and after flowing through the exhaust side 12 to evenly cool the exhaust side 12, it flows out from the second water outlet 230.

[0061] At the same time, the air in the water jacket body 1 is independently discharged out of the cylinder head through the air removal holes 130 on each cylinder area 103 .

[0062] This achieves single-layer cooling of the coolant in the low-temperature area of ​​the intake side 11 and double-layer cooling of the coolant in the high-temperature area of ​​the exhaust side 12 , thereby effectively ensuring the cooling uniformity of the intake side 11 and the exhaust side 12 in the water jacket body 1 .

[0063] The distributed water jacket structure for the MJI passive pre-combustion chamber provided by the present invention adopts the cooperation of the first water jacket 100 and the second water jacket 200, so that the water jacket body 1 forms a single-layer water jacket on the intake side 11 and a double-layer water jacket on the exhaust side 12, and flow ribs 220 are arranged on the second water jacket 200, so as to improve the cooling of the exhaust side 12 in a targeted manner and ensure the cooling uniformity, and independently discharge the air through the multiple degassing holes 130 to reduce the cavitation phenomenon, thereby ensuring the uniform heat dissipation of the cylinder head combustion chambers on the intake side and the exhaust side.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A distributed water jacket structure for an MJI passive pre-combustion chamber, characterized in that: The water jacket body is composed of a first water jacket and a second water jacket connected and matched. A first flow cavity is formed in the first water jacket, a first surface of the first water jacket is provided with a plurality of water inlets, and a first water outlet extending along the air inlet side of the water jacket body, and a degassing hole and a mounting hole are respectively provided on the second surface of the first water jacket corresponding to each cylinder area. The second water jacket is distributed on the exhaust side of the water jacket body and is arranged on the second surface of the first water jacket. A communicating flow channel is provided between the second water jacket and the first water jacket. A second flow cavity is formed in the second water jacket, and flow ribs and a second water outlet extending along the exhaust side are also distributed.

2. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 1, characterized in that: Compression pipes are respectively arranged at both ends of the matching area of ​​the first water jacket and the second water jacket, and compression holes matching the compression pipes are arranged at both ends of the second water jacket. The compression pipes are connected and matched with the compression holes to form a flow channel.

3. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 1, characterized in that: The first water jacket and the second water jacket are formed by casting a sand core structure, and the end of the second water jacket and the bottom end of the compression pipe are respectively extended to form sand cleaning holes.

4. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 1, characterized in that: The water inlets on the first water jacket are evenly distributed around each cylinder area.

5. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 4, characterized in that: The water inlets include a first group of water inlets distributed at both ends of each cylinder area, a second group of water inlets distributed outside each cylinder area, and a main water inlet arranged in the corresponding connection area between the first water jacket and the second water jacket.

6. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 5, characterized in that: The main water inlet has a larger caliber than the first and second water inlet groups, and the first and second water inlet groups are configured to have a smooth caliber.

7. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 1, characterized in that: The degassing hole extends out of the second surface of the first water jacket.

8. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 1, characterized in that: The first water jacket is also provided with a water temperature sensor mounting hole.

9. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 1, characterized in that: The flow rib is composed of a smooth arc-shaped cavity arranged in the second flow cavity, and the flow rib extends to the second water outlet.

10. The distributed water jacket structure for the MJI passive pre-combustion chamber according to claim 9, characterized in that: The flow ribs are symmetrically distributed on both sides of the second water outlet.

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