An inlet and outlet structure for enhancing flow uniformity of cylinder water jacket

Abstract

The present invention discloses an inlet and outlet structure for enhancing the flow uniformity of a cylinder water jacket, comprising a cylinder body, a cylinder liner, a cooling water jacket and a cooling water inlet and outlet, wherein the height L2 of the top of the cooling water inlet and outlet from the top of the cylinder liner is between 1 / 5 and 1 / 3 of the height L1 of the cooling water jacket; a spoiler is provided in the cooling water inlet and outlet, which is recessed along its inner lower wall and inclined toward the bottom of the cooling water jacket, and the height L3 between the bottom of the spoiler and the bottom end of the cylinder liner is between 1 / 3 and 1 / 2 of the height L1 of the cooling water jacket; the maximum cross-sectional height L4 of the spoiler is between 1 / 3 and 1 / 2 of the height L5 of the cooling water inlet and outlet; and the transverse length L6 of the spoiler is between 1 / 2 and 2 times of the height L5 of the cooling water inlet and outlet. The present invention allows the upper temperature of the cylinder liner to be kept well cooled, while the coolant at the bottom of the cylinder liner is more easily driven, the piston conducts heat evenly, and cylinder pulling failure is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of internal combustion engines, in particular to an inlet and outlet structure for enhancing the flow uniformity of a cylinder water jacket. Background Art

[0002] In the structure of the internal combustion engine, the volume of the cooling water jacket formed by the cylinder liner and the cylinder body is used to take away the excess heat transferred to the piston, piston ring, cylinder liner, etc. by the high-temperature combustion gas when the internal combustion engine is working, so that the moving parts can work normally. Generally speaking, the cooling water inlet and outlet are the inlet and outlet of the cooling water jacket, which are cast on the cylinder body and are used for the inlet and outlet of the coolant. The main considerations are the flow resistance of the coolant and the uniformity of the flow field. The height of the cooling water jacket is generally determined by the engine layout, and the height of the cooling water inlet and outlet and the height of the bottom of the cooling water inlet and outlet from the bottom of the cooling water jacket are determined by the water inlet and outlet of the cooling water jacket, and are also affected by the comprehensive influence of the structural layout.

[0003] Patent No. "CN109488476A" discloses an engine and a cylinder block thereof, wherein the cylinder block comprises a cylinder liner, wherein a cylinder liner water jacket is disposed on the outer side of the cylinder liner for dissipating heat from the cylinder liner; an extension distance between a water inlet top of the cylinder liner water jacket and a top end of the cylinder liner in the axial direction of the cylinder liner is M, an extension height of the cylinder liner along its axial direction is L, and M≤L / 3; an extension distance between a water inlet bottom of the cylinder liner water jacket and a bottom end of the cylinder liner in the axial direction of the cylinder liner is Q, and Q>L / 2; the cylinder liner water jacket comprises an upper water jacket and a lower water jacket which are sequentially distributed from top to bottom along the axial direction of the cylinder liner, and the upper water jacket and the lower water jacket are independent of each other, and a water dividing structure is disposed at the water inlet of the cylinder liner water jacket, and the water dividing structure divides the water inlet of the cylinder liner water jacket into an upper water inlet communicated with the upper water jacket and a lower water inlet communicated with the lower water jacket.

[0004] The above technical solution has the following defects:

[0005] 1. The existing solution moves the position of the cooling water inlet and outlet upward. When the cooling water inlet and outlet are fixed, the bottom of the cooling water inlet and outlet is relatively high from the bottom of the cooling water jacket. The coolant at the bottom of the cooling water jacket cannot be driven well, resulting in local stagnation of coolant or low flow rate, which causes the local temperature of the cylinder liner to be too high, resulting in reduced heat conduction of the piston and gelling of the engine oil on the piston head. At the same time, due to the excessively high local temperature, the oil film between the piston and the cylinder liner will be destroyed, resulting in cylinder scuffing failure;

[0006] 2. The above technical solution adopts a double-opening structure, and the inlet flow rate of cooling water at each opening is actually affected by the structure of the internal pipeline and is difficult to control.

[0007] The information disclosed in the above background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0008] In view of the problems existing in the prior art, the present invention provides an inlet and outlet structure for enhancing the flow uniformity of the cylinder water jacket, so that the temperature of the upper part of the cylinder jacket is kept well cooled while the coolant at the bottom of the cylinder jacket is more easily driven, the piston conducts heat evenly, and cylinder pulling failures are reduced.

[0009] To achieve the above-mentioned object of the invention, the technical solution of the present invention is as follows:

[0010] An inlet and outlet structure for enhancing the flow uniformity of a cylinder water jacket comprises a cylinder block, a cylinder liner and a cooling water jacket, wherein the cylinder liner is arranged in the cylinder block, the gap between the cylinder block and the cylinder liner forms the cooling water jacket, a cooling water inlet and outlet is arranged on the side wall of the cylinder block opposite to the cylinder liner, and the cooling water jacket is communicated with a cooling main water channel in the cylinder block through the cooling water inlet and outlet; a height L2 of the top of the cooling water inlet and outlet from the top of the cylinder liner is between 1 / 5 and 1 / 3 of the height L1 of the cooling water jacket; a spoiler is arranged in the cooling water inlet and outlet, which is recessed along its inner lower wall and inclined to the bottom of the cooling water jacket, and a height L3 of the bottom of the spoiler and the bottom end of the cylinder liner is between 1 / 3 and 1 / 2 of the height L1 of the cooling water jacket; a maximum cross-sectional height L4 of the spoiler is between 1 / 3 and 1 / 2 of the height L5 of the cooling water inlet and outlet, and a transverse length L6 of the spoiler is between 1 / 2 and 2 times of the height L5 of the cooling water inlet and outlet.

[0011] Specifically, the cross-sectional area of ​​the spoiler opening in the direction facing the cooling water jacket gradually increases.

[0012] Specifically, the spoiler port includes a groove arranged in the middle, and two sides of the groove are smoothly connected to the bottom of the cooling water inlet and outlet by arranging convex arc surfaces.

[0013] Specifically, the cross section of the groove is V-shaped or U-shaped.

[0014] Beneficial effects of the present invention:

[0015] The engine structure of the scheme of the present invention adjusts the structure of the cooling water inlet and outlet in the cylinder block. Under the condition of ensuring the flow area requirement, a spoiler is opened at the bottom of the cooling water inlet and outlet. A part of the cooling water flows from the cooling water inlet and outlet, and the other part drives and impacts the coolant at the bottom of the cooling water jacket through the spoiler. Therefore, the height between the bottom of the cooling water inlet and outlet and the bottom of the cooling water jacket is reduced, and the bottom coolant in the cooling water jacket is closer to the cooling water inlet and outlet, and is easier to be driven, so that dead zones and slow flow are not easily generated. Therefore, the upper and lower temperatures of the cooling water jacket can be kept uniform, the piston head has good heat conduction, and the cylinder pulling failure rate is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The schematic diagram of an inlet and outlet structure for enhancing the flow uniformity of a cylinder water jacket according to the present invention.

[0017] Figure 2 It is the A-direction view of the cylinder body of the present invention.

[0018] In the figure, 1-cylinder body, 2-cylinder liner, 3-cooling water jacket, 4-cooling water inlet and outlet, 5-cooling main water channel, 6-spoiler, 61-groove, 62-convex arc surface. DETAILED DESCRIPTION

[0019] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is a description of the embodiments in conjunction with the accompanying drawings.

[0020] The present invention provides an inlet and outlet structure for enhancing the flow uniformity of the cylinder water jacket. Figure 1 As shown, it includes a cylinder block 1, a cylinder liner 2 and a cooling water jacket 3. The cylinder liner 2 is arranged in the cylinder block 1. The gap between the cylinder block 1 and the cylinder liner 2 forms the cooling water jacket 3, which is used to dissipate heat from the cylinder liner 2. A cooling water inlet and outlet 4 is arranged above the side wall of the cylinder block 1 opposite to the cylinder liner 2. The cooling water jacket 3 is connected to the cooling main water channel 5 in the cylinder block 1 through the cooling water inlet and outlet 4.

[0021] Figure 1As shown, the height of the cooling water jacket 3 is L1, and the height of the top of the cooling water inlet and outlet 4 from the top of the cylinder liner 2 is L2. The height L2 of the top of the cooling water inlet and outlet 4 from the top of the cylinder liner 2 is set to between 1 / 5 and 1 / 3 of the height L1 of the cooling water jacket 3; a spoiler 6 is provided in the cooling water inlet and outlet 4. The spoiler 6 is formed along the inner lower wall of the cooling water inlet and outlet 4 and is inclined toward the bottom of the cooling water jacket 3, that is, the coolant is directed to the middle and lower part of the cylinder liner 2; the height between the bottom of the spoiler 6 and the bottom end of the cylinder liner 2 is L3, and the height L3 between the bottom position of the spoiler 6 and the bottom end of the cylinder liner 2 is between 1 / 3 and 1 / 2 of the height L1 of the cooling water jacket 3; the maximum cross-sectional height of the spoiler 6 is L4, and the height of the cooling water inlet and outlet 4 is L5. The maximum cross-sectional height L4 of the spoiler 6 is between 1 / 3 and 1 / 2 of the height L5 of the cooling water inlet and outlet 4, as shown in FIG. Figure 1 As shown, the transverse length of the spoiler opening 6 is L6, and the transverse length L6 of the spoiler opening 6 is between 1 / 2 and 2 times of the height L5 of the cooling water inlet and outlet 4.

[0022] Through the water jacket inlet and outlet structure and ratio of the above embodiment, first, for the upper part of the cooling water jacket 3, the position of the cooling water inlet and outlet 4 corresponds to Figure 1 The L2 shown is close to the upper end of the cylinder liner 2, so that the coolant in the cooling water inlet and outlet 4 can cool the upper part of the cylinder liner 2, reducing the cooling volume of the top dead zone; secondly, the coolant enters the middle position of the cooling water jacket 3 through the cooling water inlet and outlet 4, and by adjusting the structure of the cooling water inlet and outlet 4 in the cylinder body 1, a spoiler 6 is opened at the bottom of the cooling water inlet and outlet 4. A part of the cooling water flows from the cooling water inlet and outlet 4 to the cooling water jacket 3 to exchange heat for the cylinder liner 2 in the upper middle part, and the other part is guided to the bottom of the cooling water jacket 3 by the spoiler 6. The cooling water at the bottom of the cooling water jacket 3 is driven and impacted by the spoiler 6, so that the cooling liquid has sufficient acceleration space. The cooling water will not be retained in the middle of the cooling water jacket 3. The cooling water at the bottom of the cooling water jacket 3 is driven and impacted by the spoiler 6, which is easier to be driven and thus is not prone to dead zones and slow flow. Finally, by adjusting the proportional relationship between the spoiler 6 and L3, L4, and L5 of the cooling water inlet and outlet 4, the flow rate and impact force in the middle and lower parts are relatively balanced. Therefore, the temperatures of the upper, middle, and lower parts of the cooling water jacket 3 can be kept uniform, the piston head has good heat conduction, and the cylinder pulling failure rate is reduced, thereby ultimately achieving the purpose of the present invention.

[0023] As a preferred technical solution of this embodiment, the cross-sectional area of ​​the spoiler 6 in the direction of the cooling water jacket 3 gradually increases. The inclined and gradually enlarged opening strengthens the flow-guiding effect of the opening, achieving a more uniform impact range.

[0024] As a preferred technical solution of this embodiment, the spoiler 6 includes a groove 61 arranged in the middle, and the two sides of the groove 61 are smoothly connected to the bottom of the cooling water inlet and outlet 4 by arranging convex arc surfaces 62. Through the smooth connection, the coolant produces a swirl effect on both sides, further enhancing the diversion effect, and can more fully drive the coolant in the bottom dead zone.

[0025] As a further preferred technical solution of this embodiment, Figure 2 As shown, the cross section of the spoiler 6 is a U-shaped structure, which is conducive to forming a diversion impact and is more likely to drive the flow dead zone at the bottom of the cooling water jacket 3. In some embodiments, the spoiler 6 can also be set to a V-shaped structure with a stronger impact force, which can be modified accordingly according to needs and combined with the cross-sectional depth of the spoiler 6.

[0026] In some embodiments, there are more than two cooling water inlets and outlets 4, and the spoiler ports 6 corresponding to each cooling water inlet and outlet 4 are distributed around the outer surface of the cylinder liner 2, so that better driving can be achieved around the radial sides of the bottom of the cooling water jacket 3.

[0027] Although the present invention has been described in detail above with specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. An inlet and outlet structure for enhancing the flow uniformity of a cylinder water jacket, comprising a cylinder block (1), a cylinder liner (2) and a cooling water jacket (3), wherein the cylinder liner (2) is arranged in the cylinder block (1), the gap between the cylinder block (1) and the cylinder liner (2) forms the cooling water jacket (3), a cooling water inlet and outlet (4) is arranged on the side wall of the cylinder block (1) opposite to the cylinder liner (2), the cooling water jacket (3) is connected to a cooling main water channel (5) in the cylinder block (1) through the cooling water inlet and outlet (4), and characterized in that: The height L2 of the top of the cooling water inlet and outlet (4) from the top of the cylinder liner (2) is between 1 / 5 and 1 / 3 of the height L1 of the cooling water jacket (3); A spoiler (6) is provided in the cooling water inlet and outlet (4), which is recessed along the inner lower wall and inclined toward the bottom of the cooling water jacket (3). The height L3 between the bottom of the spoiler (6) and the bottom end of the cylinder liner (2) is between 1 / 3 and 1 / 2 of the height L1 of the cooling water jacket (3); The maximum cross-sectional height L4 of the spoiler (6) is between 1 / 3 and 1 / 2 of the height L5 of the cooling water inlet and outlet (4); The transverse length L6 of the spoiler port (6) is between 1 / 2 and 2 times the height L5 of the cooling water inlet and outlet (4).

2. The inlet and outlet structure for enhancing the flow uniformity of the cylinder water jacket according to claim 1, characterized in that: The cross-sectional area of ​​the spoiler port (6) in the direction of the cooling water jacket (3) gradually increases.

3. The inlet and outlet structure for enhancing the flow uniformity of the cylinder water jacket according to claim 2, characterized in that: The spoiler port (6) comprises a groove (61) arranged in the middle, and the two sides of the groove (61) are smoothly connected to the bottom of the cooling water inlet and outlet (4) by arranging convex arc surfaces (62).

4. The inlet and outlet structure for enhancing the flow uniformity of the cylinder water jacket according to claim 3, characterized in that: The cross section of the groove (61) is V-shaped or U-shaped.

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