Multi-section structure cooling jacket of cylinder head

Abstract

The utility model relates to the technical field of engine cooling, specifically relates to a cylinder cover multistage structure cooling water jacket. The cooling water jacket includes upper water jacket, and the lower side of upper water jacket is connected with water distribution part, and the inboard of water distribution part can set oil sprayer, and the side portion of water distribution part has first water distribution area, second water distribution area, third water distribution area and fourth water distribution area all along the axial setting of oil sprayer, and first water distribution area, second water distribution area, third water distribution area and fourth water distribution area all are connected with lower water jacket. Flow distribution can be carried out, guarantees the highest cooling liquid flow of the highest temperature of the row nose bridge area, can take away more heat of nose bridge area, and the lowest cooling liquid flow is set to the in the nose bridge area of minimum heat load.

Description

Technical Field

[0001] This utility model relates to the field of engine cooling technology, specifically to a multi-section cylinder head cooling water jacket. Background Technology

[0002] Existing split-type cylinder head water jackets typically employ a single-piece structure, consisting of an upper and lower water jacket. The lower water jacket is located in the lower half of the cylinder head, and coolant enters directly into either the lower or upper water jacket, resulting in limited cooling of the exhaust manifold. The upper or lower water jacket merely serves as a coolant channel, providing a flow path without quantitative control over different heat load areas. This makes it impossible to achieve differentiated flow distribution and cooling for intake and exhaust manifold areas with varying temperature loads. Furthermore, the lower water jacket portion of the cylinder head is entirely hollow, leading to a relatively weak overall cylinder head strength.

[0003] The combustion medium of the micro-injection ignition natural gas engine is natural gas, which has a higher combustion temperature than diesel engines and requires higher cooling of the engine cylinder head. This patent can achieve a higher cooling effect for the higher combustion temperature. Utility Model Content

[0004] The purpose of this invention is to provide a multi-segment cooling water jacket for cylinder heads that can distribute the flow rate, addressing the above-mentioned problems.

[0005] To achieve the above objectives, this utility model discloses a multi-segment cooling water jacket for cylinder heads. The cooling water jacket includes an upper water jacket, with a water distribution section connected to the lower side of the upper water jacket. An injector can be installed inside the water distribution section. The side of the water distribution section has a first water distribution area, a second water distribution area, a third water distribution area, and a fourth water distribution area, all arranged along the axial direction of the injector. The first water distribution area, the second water distribution area, the third water distribution area, and the fourth water distribution area are all connected to the lower water jacket.

[0006] During use, the coolant in the upper water jacket flows in the circumferential direction of the exhaust channel. The low-temperature coolant can effectively reduce the temperature of the exhaust channel wall. Then, the coolant in the upper water jacket enters the water distribution section from the upper water jacket, and then enters the lower water jacket through the first water distribution zone, the second water distribution zone, the third water distribution zone and the fourth water distribution zone. The flow can be distributed to ensure that the coolant flow rate through the highest temperature nose bridge area is the highest, so as to remove more heat from the nose bridge area. The lowest coolant flow rate is set for the nose bridge area with the least heat load.

[0007] Preferably, the drainage jacket includes a first channel connected to the first water distribution zone, a second channel connected to the second water distribution zone, a third channel connected to the third water distribution zone, and a third channel connected to the fourth water distribution zone.

[0008] The coolant flows from the first water distribution zone to the first channel, from the second water distribution zone to the second channel, from the third water distribution zone to the third channel, and from the fourth water distribution zone to the third channel, facilitating flow distribution.

[0009] Preferably, the cross-sectional area of ​​the first water distribution zone is greater than that of the second water distribution zone, the cross-sectional area of ​​the second water distribution zone is greater than that of the fourth water distribution zone, and the cross-sectional area of ​​the fourth water distribution zone is greater than that of the third water distribution zone.

[0010] Coolant flows out from the first, second, third, and fourth water distribution zones, branching into the exhaust nose area, the two inlet and exhaust nose areas, and the inlet nose area. This allows for flow distribution, ensuring that the highest flow of coolant passes through the exhaust nose area, which has the highest temperature, to remove more heat from the nose area. The inlet nose area, which has the lowest heat load, is set with the lowest coolant flow rate.

[0011] Preferably, the height of the lower side of the upper water jacket gradually decreases from its edge to the water distribution section.

[0012] When in use, the water distribution section is located at the lowest point of the upper water jacket. Due to gravity, all the coolant flows to the injector position and then into the lower water jacket, which helps to improve the fluidity of the coolant.

[0013] Preferably, a first guide channel is provided between the first water distribution zone and the second water distribution zone, a second guide channel is provided between the second water distribution zone and the third water distribution zone, a third guide channel is provided between the third water distribution zone and the fourth water distribution zone, and a fourth guide channel is provided between the fourth water distribution zone and the first water distribution zone.

[0014] During use, the flow guiding structures corresponding to the first, second, third, and fourth flow guiding channels ensure that the coolant flows through them at a higher flow rate, increasing the heat transfer coefficient, carrying away more heat from the injector and preventing injector sintering.

[0015] Preferably, the bottoms of the first guide groove, the second guide groove, the third guide groove and the fourth guide groove are all flush with the side of the injector.

[0016] In use, the first, second, third, and fourth water distribution zones are completely isolated by the corresponding flow guiding structures of the first, second, third, and fourth flow guiding channels, which helps to improve the accuracy of flow distribution.

[0017] Preferably, a water supply jacket is also connected to the lower side of the upper water jacket, and a water inlet is connected to the lower side of the water supply jacket. Specifically, the water supply jacket is located at the end of the upper water jacket closer to the exhaust side, and there is a gap between the water supply jacket and the lower water jacket. This not only increases the cooling effect but also significantly improves the overall rigidity of the cylinder head. Its characteristic is that the partition structure is located on the cylinder head bolt pitch circle, which helps to resist the effects of engine knock pressure.

[0018] During use, the coolant enters the water supply jacket through the inlet and then enters the upper water jacket, making it convenient to use.

[0019] Preferably, the lower water jacket is connected to a water outlet. Specifically, the water outlet is located at the end of the lower water jacket closer to the air inlet side.

[0020] During use, the coolant is discharged from the lower water jacket through the outlet, making it convenient to use.

[0021] Preferably, an air vent is connected between the upper part of the upper water jacket near the outlet and the outlet.

[0022] During use, the vent is used to expel excess air from inside the water chamber to prevent insufficient coolant filling.

[0023] Preferably, the upper end of the lower water jacket away from the outlet is connected to the upper water jacket via a communication port.

[0024] When in use, the connecting port is used to increase the flow of coolant in the area, avoid stagnant water zones, increase the overall temperature uniformity of the cylinder head, and prevent local temperatures from being too high or too low.

[0025] In summary, the beneficial effects of this utility model are as follows: During use, the coolant in the upper water jacket flows in the circumferential direction of the exhaust channel. The low-temperature coolant can effectively reduce the temperature of the exhaust channel wall. Then, the coolant in the upper water jacket enters the water distribution section from the upper water jacket, and then enters the lower water jacket through the first water distribution zone, the second water distribution zone, the third water distribution zone and the fourth water distribution zone. Flow distribution can be carried out to ensure that the coolant flow rate through the highest temperature nose bridge area is the highest, which can remove more heat from the nose bridge area. The lowest coolant flow rate is set for the nose bridge area with the least heat load. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a multi-segment cooling water jacket for a cylinder head according to this utility model; Figure 2 This is a side view of a multi-segment cooling water jacket for a cylinder head according to this utility model. Figure 3 This is a bottom view schematic diagram of a multi-segment cooling water jacket for a cylinder head according to this utility model. Figure 4This is a structural schematic diagram of the cross-section of the cylinder head injector in a multi-segment cooling water jacket of the present invention. Figure 5 This is a schematic diagram of the water distribution section in a multi-segment cooling water jacket of a cylinder head according to this utility model.

[0027] In the diagram: 1. Water supply jacket; 101. Water inlet; 2. Water jacket; 3. Drainage sleeve; 301. First channel; 302. Second channel; 303. Third channel; 304. Fourth channel; 305. Outlet; 4. Water distribution section; 401. First water distribution zone; 402. Second water distribution zone; 403. Third water distribution zone; 404. Fourth water distribution zone; 405. First guide channel; 406. Second guide channel; 407. Third guide channel; 408. Fourth guide channel; 5. Connecting port; 6. Exhaust port; 7. Fuel injectors. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0029] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] like Figures 1 to 3 As shown, a multi-segment cooling water jacket for cylinder heads includes an upper water jacket 2. A water distribution section 4 is connected to the lower side of the upper water jacket 2. An injector 7 can be installed inside the water distribution section 4. The side of the water distribution section 4 has a first water distribution area 401, a second water distribution area 402, a third water distribution area 403, and a fourth water distribution area 404, all arranged along the axial direction of the injector 7. The first water distribution area 401, the second water distribution area 402, the third water distribution area 403, and the fourth water distribution area 404 are all connected to the lower water jacket 3. During use, the coolant in the upper water jacket 2 flows in the circumferential direction of the exhaust channel. The low-temperature coolant can effectively reduce the temperature of the exhaust channel wall. Then, the coolant in the upper water jacket 2 enters the water distribution section 4, and then enters the lower water jacket 3 through the first water distribution zone 401, the second water distribution zone 402, the third water distribution zone 403 and the fourth water distribution zone 404. The flow can be distributed to ensure that the coolant flow through the highest temperature nose bridge area is the highest, so as to remove more heat from the nose bridge area. The lowest coolant flow is set for the nose bridge area with the least heat load.

[0033] Specifically, the lower water jacket 3 includes a first channel 301 connected to the first water distribution zone 401, a second channel 302 connected to the second water distribution zone 402, a third channel 303 connected to the third water distribution zone 403, and a third channel 303 connected to the fourth water distribution zone 404. Coolant flows from the first water distribution zone 401 to the first channel 301, from the second water distribution zone 402 to the second channel 302, from the third water distribution zone 403 to the third channel 303, and from the fourth water distribution zone 404 to the third channel 303, facilitating flow distribution. The cross-sectional area of ​​the first water distribution zone 401 is larger than that of the second water distribution zone 402, the cross-sectional area of ​​the second water distribution zone 402 is larger than that of the fourth water distribution zone 404, and the cross-sectional area of ​​the fourth water distribution zone 404 is larger than that of the third water distribution zone 403. Coolant flows out from the first water distribution zone 401, the second water distribution zone 402, the third water distribution zone 403 and the fourth water distribution zone 404, and flows to the exhaust nose area, the two inlet and exhaust nose areas and the inlet nose area. The flow rate can be distributed to ensure that the coolant flow rate to the exhaust nose area with the highest temperature is the highest, so as to remove more heat from the nose area, while the inlet nose area with the lowest heat load is set to the lowest coolant flow rate.

[0034] Specifically, the height of the lower side of the upper water jacket 2 gradually decreases from its edge to the water distribution section 4. During use, the water distribution section 4 is located at the lowest point of the upper water jacket 2. Due to gravity, all the coolant flows towards the injector and then into the lower water jacket, which helps improve coolant flowability. A first guide channel 405 is provided between the first water distribution section 401 and the second water distribution section 402; a second guide channel 406 is provided between the second water distribution section 402 and the third water distribution section 403; a third guide channel 407 is provided between the third water distribution section 403 and the fourth water distribution section 404; and a fourth guide channel 408 is provided between the fourth water distribution section 404 and the first water distribution section 401. In use, the flow guiding structures corresponding to the first guide channel 405, second guide channel 406, third guide channel 407, and fourth guide channel 408 ensure that the coolant flows through these channels at a higher velocity, increasing the heat transfer coefficient and carrying away more heat from the injector 7, thus preventing the injector 7 from sintering. The bottoms of the first guide channel 405, second guide channel 406, third guide channel 407, and fourth guide channel 408 are all flush with the side of the injector 7. During use, the flow guiding structures corresponding to the first guide channel 405, second guide channel 406, third guide channel 407, and fourth guide channel 408 completely isolate the first water distribution zone 401, second water distribution zone 402, third water distribution zone 403, and fourth water distribution zone 404, which helps improve the accuracy of flow distribution.

[0035] Specifically, the upper water jacket 2 is connected to a water supply jacket 1 on its lower side, and the water supply jacket 1 is connected to an inlet 101 on its lower side. Specifically, the water supply jacket 1 is located at the end of the upper water jacket 2 near the exhaust side. There is a gap between the water supply jacket 1 and the lower water jacket 3, which increases the cooling effect and significantly improves the overall rigidity of the cylinder head. Its characteristic is that the partition structure is located on the cylinder head bolt pitch circle, which helps resist the effects of engine knock pressure. In use, coolant enters the water supply jacket 1 through the inlet 101 and then enters the upper water jacket 2, making it convenient to use. The lower water jacket 3 is connected to an outlet 305. Specifically, the outlet 305 is located at the end of the lower water jacket 3 near the intake side. In use, coolant is discharged from the lower water jacket 3 through the outlet 305, making it convenient to use. An vent 6 is connected between the upper part of the upper water jacket 2 near the outlet 305 and the outlet 305. In use, the vent 6 is used to expel excess air from inside the water chamber, preventing insufficient coolant filling. The lower water jacket 3 has a connecting port 5 at the upper end away from the outlet 305, which is connected to the upper water jacket 2. Specifically, the size is controlled within a diameter of 5-8mm. In use, the connecting port 5 is used to increase the flow of coolant in this area, avoid stagnant water zones, increase the overall temperature uniformity of the cylinder head, and prevent localized excessively high or low temperatures.

[0036] Positioning the coolant supply below the exhaust manifold and directing the coolant entry into the cylinder head along the circumference of the exhaust manifold effectively improves cooling performance. Controlling the area of ​​the coolant distribution zone allows for effective allocation of coolant flow between the intake and exhaust valves. Different coolant flow rates can be designed based on varying heat loads between the intake and exhaust valves, further enhancing cooling efficiency and increasing cylinder head temperature uniformity.

[0037] The patent can be used in applications including, but not limited to, natural gas engines and diesel engines.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A multi-segment cooling water jacket for a cylinder head, characterized in that, It includes an upper water jacket (2), and a water distribution section (4) is connected to the lower side of the upper water jacket (2). An injector (7) can be installed inside the water distribution section (4). The side of the water distribution section (4) has a first water distribution area (401), a second water distribution area (402), a third water distribution area (403) and a fourth water distribution area (404) arranged along the axial direction of the injector (7). The first water distribution area (401), the second water distribution area (402), the third water distribution area (403) and the fourth water distribution area (404) are all connected to the lower water jacket (3).

2. The cooling water jacket as described in claim 1, characterized in that, The drainage jacket (3) includes a first channel (301) connected to the first water distribution zone (401), a second channel (302) connected to the second water distribution zone (402), a third channel (303) connected to the third water distribution zone (403), and a third channel (303) connected to the fourth water distribution zone (404).

3. The cooling water jacket as described in claim 1, characterized in that, The cross-sectional area of ​​the first water distribution zone (401) is greater than that of the second water distribution zone (402), the cross-sectional area of ​​the second water distribution zone (402) is greater than that of the fourth water distribution zone (404), and the cross-sectional area of ​​the fourth water distribution zone (404) is greater than that of the third water distribution zone (403).

4. The cooling water jacket as described in claim 1, characterized in that, The height of the lower side of the upper water jacket (2) gradually decreases from its edge to the water distribution part (4).

5. The cooling water jacket as described in claim 1, characterized in that, A first guide channel (405) is provided between the first water distribution zone (401) and the second water distribution zone (402), a second guide channel (406) is provided between the second water distribution zone (402) and the third water distribution zone (403), a third guide channel (407) is provided between the third water distribution zone (403) and the fourth water distribution zone (404), and a fourth guide channel (408) is provided between the fourth water distribution zone (404) and the first water distribution zone (401).

6. The cooling water jacket as described in claim 5, characterized in that, The bottoms of the first guide groove (405), the second guide groove (406), the third guide groove (407) and the fourth guide groove (408) are all flush with the side of the injector (7).

7. The cooling water jacket as described in any one of claims 1 to 6, characterized in that, The lower side of the upper water jacket (2) is also connected to the water supply jacket (1), and the lower side of the water supply jacket (1) is connected to the water inlet (101).

8. The cooling water jacket as described in any one of claims 1 to 6, characterized in that, The lower water jacket (3) is connected to a water outlet (305).

9. The cooling water jacket as described in claim 8, characterized in that, The upper part of the upper water jacket (2) near the outlet (305) is connected to the outlet (305) by an air vent (6).

10. The cooling water jacket as described in claim 8, characterized in that, The end of the lower water jacket (3) away from the outlet (305) is connected to the upper water jacket (2) by a communication port (5).

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