High-pressure casting pressure shell

Abstract

The utility model provides a high-pressure casting pressure shell, relates to the technical field of pressure shells, and aims to solve the technical problems that in the prior art, a high-pressure casting turbocharger pressure shell is high in cost, low in installation efficiency, difficult to meet boundary and assembly requirements and poor in performance. A high-pressure casting pressure shell comprises a pressure shell body, the pressure shell body comprises a first outlet section and a second outlet section arranged at one end of the first outlet section, the second outlet section is arranged obliquely upwards, channels communicated with each other are arranged in the first outlet section and the second outlet section, and a through hole is formed in the side wall of the second outlet section. The position of the through hole corresponds to the tail end of the channel in the first outlet section, a plug is connected in the through hole, and the included angle alpha between the second outlet section and the horizontal plane is larger than or equal to the included angle beta between the plug and the horizontal plane.

Description

Technical Field

[0001] This utility model relates to the field of pressure shell technology, specifically to a high-pressure casting pressure shell. Background Technology

[0002] In order to make engine development more compact and require a more compact engine layout, turbocharger manufacturers have made it impossible for many turbocharger housings to use the original straight outlet due to insufficient space inside the engine. Instead, they have to use curved outlets to meet boundary and assembly requirements.

[0003] Currently, most elbow-shaped pressure shells can only be manufactured using sand casting. However, sand casting is inefficient and has high machining allowances and costs, which is not conducive to achieving weight reduction and cost reduction goals. If high-pressure casting is used, the process requires core pulling. For irregularly shaped outlets with not only bends but also long exits, a one-piece pressure shell cannot achieve core pulling. Therefore, it can only be designed as a two-piece pressure shell, that is, the outlet section is cut into two pieces and connected by bolts. This two-piece pressure shell requires additional molds for the connecting section, and the outlet section needs to be connected by flanges and bolts. Considering the machining costs of gaskets and mounting surfaces, the overall manufacturing and installation costs are high, and the additional flange structure is difficult to meet boundary and assembly requirements.

[0004] Furthermore, for pressure shells produced by high-pressure casting, gas compression performance is a very important indicator. This is because the main differences between pressure shells produced by high-pressure casting and those produced by traditional gravity casting lie in the significant reduction in cost and a partial decrease in performance. For pressure shells with complex structures, the performance degradation is even more pronounced. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a high-pressure die-casting pressure shell to solve the technical problems of high cost, low installation efficiency, difficulty in meeting boundary and assembly requirements, and poor performance of high-pressure die-cast turbocharger pressure shells in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model provides a high-pressure casting pressure shell, including a pressure shell body. The pressure shell body includes a first outlet section and a second outlet section located at one end of the first outlet section. The second outlet section is obliquely upward. Both the first outlet section and the second outlet section are provided with interconnected channels. A through hole is provided on the side wall of the second outlet section. The position of the through hole corresponds to the end of the internal channel of the first outlet section. A plug is connected in the through hole. The angle α between the second outlet section and the horizontal plane is greater than or equal to the angle β between the plug and the horizontal plane.

[0007] With the above structure, the high-pressure die-casting pressure shell of this utility model has the following advantages: Since the position of the through hole corresponds to the end of the internal channel of the first outlet section, the through hole can serve as a core-pulling port at the first outlet section, and the outlet itself at the end of the second outlet section can serve as another core-pulling port. Therefore, the pressure shell of this utility model can be produced by high-pressure die-casting process. First, the core is pulled out and demolded from the second outlet section, then the core is pulled out and demolded from the first outlet section through the through hole, and finally the upper and lower demolding is performed. There is no need to use sand casting process, which improves production efficiency and reduces production cost. Moreover, after the pressure shell is produced, only the through hole needs to be sealed with a plug, without the need for additional assembly parts, which also reduces costs and can meet boundary and assembly requirements. In addition, by limiting the size relationship between the second outlet section, the plug and the horizontal plane, the airflow flows more smoothly from the channel in the first outlet section to the channel in the second outlet section, and the loss when passing through the corner is smaller, thereby improving the performance of the pressure shell.

[0008] As an improvement, the bisector of the angle between the plug and the gas flow direction in the first and second outlet sections is set perpendicularly. With this structure, the plug is at the optimal angle in this state, which can minimize the loss of airflow when passing through the corner and improve the performance of the pressure shell.

[0009] As an improvement, the upper width of the cross-section of the internal channel of the first outlet section is smaller than the lower width. With this structure, the upper part of the internal channel of the first outlet section is the inner ring near the airflow turning point, and the lower part of the internal channel of the first outlet section is the outer ring near the airflow turning point. The turning radius of the inner ring is smaller, the sudden change in airflow direction is more violent, and the performance loss is greater. Making the upper width of the cross-section of the internal channel of the first outlet section smaller than the lower width allows most of the airflow to pass along the outer ring, thereby reducing airflow loss and improving the performance of the pressure shell.

[0010] As an improvement, the cross-sectional area of ​​the internal channel of the first outlet section gradually increases towards the end; this structure further reduces gas loss, thereby improving the performance of the pressure shell.

[0011] As an improvement, the cross-sectional area of ​​the internal channel of the first outlet section increases linearly towards the end; this structure further reduces gas loss, thereby improving the performance of the pressure shell.

[0012] As an improvement, the plug is interference-fitted with the through hole; this structure improves the sealing performance of the plug at the through hole.

[0013] As an improvement, the plug is a plug head or a cup-shaped plug. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] Figure 2This is a cross-sectional view of the first outlet section in this utility model.

[0016] Figure 3 This is a cross-sectional view of the pressure shell body in this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 5 This is a three-dimensional structural schematic diagram of the present invention from another perspective.

[0019] Figure 6 This is a three-dimensional structural diagram of the plug component in this utility model.

[0020] Reference numerals: 100, pressure shell body; 1, first outlet section; 2, second outlet section; 3, through hole; 4, plug. Detailed Implementation

[0021] The following is a detailed description of a high-pressure casting pressure shell according to the present invention, with reference to the accompanying drawings.

[0022] like Figures 1 to 6 As shown, a high-pressure casting pressure shell includes a pressure shell body 100. The pressure shell body 100 includes a first outlet section 1 and a second outlet section 2 located at one end of the first outlet section 1. The second outlet section 2 is obliquely upward. Both the first outlet section 1 and the second outlet section 2 have interconnected channels. Specifically, as shown... Figure 1 As shown, the second outlet section 2 is located at the right end of the first outlet section 1. The second outlet section 2 is inclined upwards and to the right from left to right. A flow channel section is also provided at the left end of the first outlet section 1, and an inlet section is located at the upper end of the flow channel section. The gas flow principle of the pressure shell is as follows: first, air enters through the engine pipeline through the upper opening of the inlet section; then, the gas is transported through the internal channel of the flow channel section to the internal channel of the first outlet section 1; finally, it is discharged into the pipeline through the upper opening of the second outlet section 2. The distribution, specific structure, and principle of each section of the pressure shell body 100 are existing technologies and will not be described in detail here.

[0023] like Figure 1 and Figure 3As shown, a through hole 3 is provided on the side wall of the second outlet section 2. The position of the through hole 3 corresponds to the end of the internal channel of the first outlet section 1. The so-called end is based on the airflow direction. The through hole 3 can be used for core pulling in high-pressure casting. Since the position of the through hole 3 corresponds to the end of the internal channel of the first outlet section 1, the through hole 3 can serve as a core pulling port at the first outlet section 1, and the outlet itself at the end of the second outlet section 2 can serve as another core pulling port. Therefore, the turbocharger pressure shell of this utility model can be produced by high-pressure casting process. First, the core is pulled and demolded from the second outlet section 2, then the core is pulled and demolded from the first outlet section 1 through the through hole 3, and finally the upper and lower parts are demolded. There is no need to use sand casting process, which improves production efficiency and reduces production costs.

[0024] like Figure 1 As shown, a plug 4 is connected inside the through hole 3. The plug 4 is interference-fitted with the through hole 3 to seal and prevent air leakage. After the pressure shell body 100 is produced by high pressure casting, it is only necessary to use the plug 4 to seal the through hole 3. No additional assembly parts are required, which also reduces costs and meets the boundary and assembly requirements.

[0025] In this embodiment, the plug 4 is a plug or a cup-shaped plug. Of course, in some other embodiments, the plug 4 can also be other sealing components that can be used to seal the through hole 3 and play a sealing role.

[0026] When the airflow flows from the channel in the first outlet section 1 to the channel in the second outlet section 2, there is gas energy loss. The greater the gas energy loss, the worse the performance of the pressure shell will be. Therefore, in order to improve the performance of the pressure shell, it is necessary to minimize the gas energy loss as much as possible.

[0027] like Figure 1 As shown, the angle α (acute angle) between the second outlet section 2 and the horizontal plane is greater than or equal to the angle β (acute angle) between the plug 4 and the horizontal plane. The plug 4 can guide the airflow at the corner, making the airflow smoother and reducing the loss when passing through the corner. For a pressure shell, the included angle α is a value determined to meet the boundary and assembly requirements. As the optimal choice, the angle bisector of the angle between the plug 4 and the gas flow direction in the first outlet section 1 and the gas flow direction in the second outlet section 2 is ( Figure 1 The dotted line portion (in the diagram) is vertically set, and the included angle β is the optimal angle. However, when the structure of the plug 4 cannot be achieved in the process at this angle, the angle of the plug 4 is adjusted to be parallel to the airflow at the outlet of the second outlet section 2 until the process becomes feasible, so as to achieve the best pressure shell performance under the premise that the process is feasible. In this embodiment, the plug 4 is as follows: Figure 6 The structure shown is such that the planar portion of the plug 4 used to block the through hole 3 is set perpendicular to the angle bisector of the angle between the gas flow direction in the first outlet section 1 and the gas flow direction in the second outlet section 2.

[0028] To further improve the performance of the pressure shell, such as Figure 2 As shown, the upper width of the cross-section of the internal channel of the first outlet section 1 is smaller than the lower width. The upper part of the internal channel of the first outlet section 1 is the inner ring near the airflow turning angle, and the lower part of the internal channel of the first outlet section 1 is the outer ring near the airflow turning angle. The turning radius of the inner ring is smaller, the sudden change in airflow direction is more violent, and the performance loss is greater. Making the upper width of the cross-section of the internal channel of the first outlet section 1 smaller than the lower width allows most of the airflow to pass along the outer ring, thereby reducing airflow loss and improving the performance of the pressure shell.

[0029] Specifically, in this embodiment, the cross-section of the internal channel of the first outlet section 1 is as follows: Figure 2 The triangular shape shown has two hypotenuses, left and right, with the upper ends of the two hypotenuses connected by arc segments. The base is also an arc segment, with the two ends of the arc segment of the base connected to the lower ends of the two hypotenuses by other arc segments.

[0030] Furthermore, the cross-sectional area of ​​the internal passage of the first exit section 1 gradually increases towards the end; specifically, the cross-sectional area of ​​the internal passage of the first exit section 1 increases linearly towards the end. Figure 1 and Figure 3 As shown, the bottom of the first exit section 1 is set diagonally downward from left to right, and the bottom of the first exit section 1 is also the bottom of the internal channel of the first exit section 1.

[0031] This invention enables high-pressure casting of irregularly shaped (especially those with an outlet slope greater than 45 degrees, or curved and long outlets) outlet shells, achieving cost reduction. Compared with the traditional two-piece design, it can reduce an additional mold and sub-parts, reduce costs, make installation more convenient, and make the space more compact, achieving the best performance target.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A high-pressure die-cast pressure shell, characterized in that, The system includes a pressure shell body (100), which includes a first outlet section (1) and a second outlet section (2) located at one end of the first outlet section (1). The second outlet section (2) is obliquely upward. Both the first outlet section (1) and the second outlet section (2) have interconnected channels. The side wall of the second outlet section (2) has a through hole (3). The position of the through hole (3) corresponds to the end of the internal channel of the first outlet section (1). A plug (4) is connected in the through hole (3). The angle α between the second outlet section (2) and the horizontal plane is greater than or equal to the angle β between the plug (4) and the horizontal plane.

2. The high-pressure die-casting pressure shell according to claim 1, characterized in that, The plug (4) is set perpendicular to the bisector of the angle between the gas flow direction in the first outlet section (1) and the gas flow direction in the second outlet section (2).

3. The high-pressure die-casting pressure shell according to claim 1, characterized in that, The upper width of the internal channel cross section of the first exit section (1) is smaller than the lower width.

4. The high-pressure die-casting pressure shell according to claim 1, characterized in that, The cross-sectional area of ​​the internal passage of the first exit section (1) gradually increases towards the end.

5. The high-pressure die-casting pressure shell according to claim 4, characterized in that, The cross-sectional area of ​​the internal passage of the first exit section (1) increases linearly towards the end.

6. The high-pressure die-casting pressure shell according to claim 1, characterized in that, The plug (4) is interference-fitted with the through hole (3).

7. The high-pressure die-casting pressure shell according to claim 1, characterized in that, The plug (4) is a plug or a cup-shaped plug.

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