Cylinder head inner cooling water chamber structure

Abstract

The application relates to the technical field of cylinder covers, in particular to a cooling water cavity structure in a cylinder cover, which can preferentially cool the area near the exhaust passage, improve the cooling effect, reduce thermal stress and improve the reliability of the cylinder cover. The cylinder cover body is provided with an air inlet channel and an exhaust channel, and a cooling water cavity is arranged in the cylinder cover body. The cooling water cavity is connected with a water inlet and a water outlet. The cooling water cavity is an annular cavity. A tower type flow collecting cavity is arranged between the air inlet channel and the exhaust channel. Water inlet channels connected with the lower part of the tower type flow collecting cavity are arranged between two adjacent air inlet channels, between two adjacent exhaust channels and between an adjacent air inlet channel and an exhaust channel. The water inlet is arranged on each water inlet channel. The upper part of the tower type flow collecting cavity is connected with the cooling water cavity. The water outlet is arranged on the side close to the exhaust channel.

Description

Technical Field

[0001] This invention relates to the field of cylinder head technology, specifically to a cooling water chamber structure inside a cylinder head. Background Technology

[0002] With the continuous improvement of engine power and reinforcement, especially the cylinder head, a core component of heavy-duty diesel engines, is subjected to high explosion pressure, strong preload, high thermal load, and thermal stress. Due to its complex shape and uneven cooling, the cylinder head experiences large temperature differences in different parts when subjected to thermal loads, especially near the exhaust port, where the thermal load is very high. The existing cooling water chambers are insufficient to cool this area, resulting in high thermal stress and affecting the reliability of the cylinder head. Summary of the Invention

[0003] To address the problem that existing cooling systems near the exhaust port in the cylinder head experience high heat loads and poor cooling performance, leading to high thermal stress and affecting cylinder head reliability, this invention provides a cylinder head cooling water chamber structure that prioritizes cooling of the area near the exhaust port, improves cooling efficiency, reduces thermal stress, and thus enhances cylinder head reliability.

[0004] The technical solution is as follows: a cylinder head internal cooling water cavity structure, comprising a cylinder head body, an intake channel and an exhaust channel on the cylinder head body, and a cooling water cavity disposed within the cylinder head body, the cooling water cavity connecting an inlet and an outlet, characterized in that the cooling water cavity is an annular cavity, a tower-type flow collector cavity is disposed between the intake channel and the exhaust channel, and an inlet channel connecting the lower part of the tower-type flow collector cavity is disposed between two adjacent intake channels, between two adjacent exhaust channels, and between adjacent intake channels and exhaust channels, each inlet channel having an inlet, the upper part of the tower-type flow collector cavity communicating with the cooling water cavity, and the outlet being located near the exhaust channel.

[0005] A further feature is that a flow guide baffle is provided on the side of the tower-type flow collection cavity near the exhaust channel; The tower-type flow collection cavity is an annular cavity; An auxiliary channel is provided between the water inlet channels on the side near the exhaust channel; The water inlet channel is formed by drilling a hole in the side wall of the cylinder head body to the tower-shaped collection cavity, and the drilled hole is equipped with a sealing element; the water inlet is formed by drilling a hole in the bottom of the cylinder head body to the water inlet channel. The top of the cooling water cavity is a concave arc shape.

[0006] With this invention, the cooling water entering the cylinder head body first reaches the tower-type manifold, and then flows upward into the cooling water chamber, preferentially cooling the area where the exhaust passage is located. Furthermore, the outlet is located near the exhaust passage, ensuring that the cooling water exiting the tower-type manifold flows towards the exhaust passage, reducing the heat load and thermal stress in that area, and ensuring product reliability. Additionally, the baffle plate guides the water flow into the cooling water chamber, directing it as much as possible towards the exhaust direction. Simultaneously, the baffle plate acts as a special reinforcing rib, providing auxiliary support. Moreover, the interwoven auxiliary and inlet channels form a mesh near the exhaust passage, ensuring enhanced cooling around the exhaust passage while also creating a continuous flow distribution between the inlet channels, resulting in even flow distribution. Even if some channels are blocked, it maintains bypass flow, further improving the cooling effect. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the cylinder head body of the present invention; Figure 2 for Figure 1 Sectional view along the AA direction; Figure 3 for Figure 1 Cross-sectional view along the BB direction; Figure 4 This is a three-dimensional schematic diagram of the present invention; Figure 5 This is a schematic diagram of the water flow trajectory; Figure 6 This is a three-dimensional schematic diagram of the cooling water chamber. Detailed Implementation

[0008] See Figures 1 to 6 As shown, a cylinder head internal cooling water chamber structure includes a cylinder head body 1, an intake channel 2 and an exhaust channel 3 on the cylinder head body 1, and a cooling water chamber 4 disposed inside the cylinder head body. In this embodiment, it is a single-unit four-valve cylinder head, including two intake channels 2 and two exhaust channels 3. The cooling water chamber 4 is connected to a water inlet 5 and a water outlet 8. The cooling water chamber 4 is an annular cavity. A tower-type flow collector 6 is disposed between the intake channels 2 and the exhaust channels 3. Water inlet channels 7 connecting the lower part of the tower-type flow collector 6 are disposed between two adjacent intake channels 2, between two adjacent exhaust channels 3, and between adjacent intake channels 2 and exhaust channels 3. In this embodiment, there are four cross-shaped water inlet channels 7. Each water inlet channel 7 is provided with a water inlet 5. The upper part of the tower-type flow collector 6 is connected to the cooling water chamber 4. The water outlet 8 is located on the side close to the exhaust channel 3.

[0009] The tower-type manifold 6 is an annular cavity, which can make the cooling of the heat-prone area more uniform and reduce fluid pressure loss. The tower-type manifold 6 is provided with a flow guide baffle 9 on the side near the exhaust channel 3, which can guide the water flow into the cooling water cavity 4 and flow as much as possible to the exhaust side. At the same time, the flow guide baffle 9 can also serve as a special reinforcing rib to form an auxiliary support.

[0010] The cylinder head in this invention adopts a thick bottom plate structure, which can withstand high mechanical loads.

[0011] In this invention, the cooling water cavity 4 is a cast water cavity. The water inlet channel 7 is formed by drilling a hole from the side wall of the cylinder head body 1 to the tower-type manifold 6, and the drilled hole is sealed with a standard sealing element, such as a plug screw. The water inlet 5 is formed by drilling a hole from the bottom of the cylinder head body 1 to the water inlet channel 7. In this way, the water hole passes through the interior of the bottom plate from the side, which can ensure the thickness of the plate and is beneficial to bearing the cylinder explosion pressure. The water inlet channels 7 near the exhaust channel 3 are provided with interconnected auxiliary channels 10. They are interwoven to form a mesh below the exhaust channel 3, which can not only ensure the enhanced cooling of the area around the exhaust channel 3, but also form a through flow and diversion between the water inlet channels 7, so that the flow rate can be evenly distributed. Even if there is a blockage in some channels, it can maintain the bypass flow effect.

[0012] Because the top of the cylinder head bears the strong mechanical load of bolt preload and cylinder explosion pressure transmission, it is necessary to strengthen the top plate structure. Therefore, in this invention, the top of the cooling water cavity 4 is a concave arc-shaped top, and the inner cavity and the cylinder head top plate frame form an inverted arch structure. This design optimizes the mechanical model, enhances the rigidity of the cylinder head top plate, locally thickens the top plate within the range of explosion pressure transmission, reduces top plate deformation, makes the stress distribution more uniform when bearing load, and alleviates local high stress areas, thereby improving the reliability of the cylinder head.

[0013] The cooling principle of this invention is as follows: Cooling water enters the cylinder head body 1 through the inlet channel 7 and flows directly through the tower-type manifold 6, which is the area where the intake channel 2 and exhaust channel 3 are located. The water flow velocity in the inlet channel 7 can reach more than 3.5 m / s. The high flow velocity and high heat exchange rate are used to enhance cooling. The cooling water continues to flow upward to the cooling water cavity 4 through the tower-type manifold 6. Due to the presence of the guide baffle 9, the cooling water is guided and guided to flow as much as possible to the exhaust side after entering the cooling water cavity 4. Because the heat load around the exhaust channel 3 is very high, the casting water cavity surrounds the top and side walls of the exhaust channel 3 as much as possible. The outlet 8 is arranged above the exhaust channel, and a high-level return water arrangement is adopted to avoid the occurrence of cooling water "short circuit". This design and arrangement ensures that the temperature difference and thermal stress of each part of the cylinder head are minimized under working conditions.

[0014] Under simulated normal operating conditions, the heat transfer coefficients in key areas of this invention are generally above 10,000 W / m²K; the heat transfer coefficient at the inlet is approximately 28,000 W / m²K; the heat transfer coefficient on the sidewalls surrounding the exhaust channel is approximately 12,000 W / m²K; and the heat transfer coefficient on the upper sidewall of the intake channel is approximately 6,000 W / m²K. The overall distribution of heat transfer coefficients is reasonable, resulting in good cooling efficiency of the water cavity.

[0015] In summary, the present invention provides an advanced, efficient, and reliable cylinder head water chamber design. The design is highly applicable; the main water jacket is cast, while the bottom water inlet channel and opening can be machined, reducing the difficulty of casting the water chamber core. Currently, our company's latest heavy-duty diesel engine cylinder heads have adopted this design and have undergone testing and verification before being launched into the market.

Claims

1. A cylinder head internal cooling water chamber structure, comprising a cylinder head body, wherein an intake passage and an exhaust passage are provided on the cylinder head body, and a cooling water chamber is disposed within the cylinder head body, the cooling water chamber communicating with an inlet and an outlet, characterized in that, The cooling water cavity is an annular cavity. A tower-type flow collecting cavity is provided between the air intake channel and the exhaust channel. Water inlet channels connecting the lower part of the tower-type flow collecting cavity are provided between two adjacent air intake channels, between two adjacent exhaust channels, and between adjacent air intake channels and exhaust channels. Each water inlet channel has a water inlet. The upper part of the tower-type flow collecting cavity is connected to the cooling water cavity. The water outlet is located on the side near the exhaust channel. A flow guide baffle is provided on the side of the tower-type flow collecting cavity near the exhaust channel. The top of the cooling water cavity is a concave arc-shaped top.

2. The cylinder head internal cooling water chamber structure according to claim 1, characterized in that, The tower-type flow collection cavity is an annular cavity.

3. The cylinder head internal cooling water chamber structure according to claim 1, characterized in that, An auxiliary channel is provided between the water inlet channels on the side near the exhaust channel.

4. The cylinder head internal cooling water chamber structure according to claim 1, characterized in that, The water inlet channel is formed by drilling a hole in the side wall of the cylinder head body to the tower-type collection cavity, and the drilled hole is equipped with a sealing element. The water inlet is formed by drilling a hole in the bottom of the cylinder head body to the water inlet channel.

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