A scroll structure for a turbocharger and a turbocharger
By employing an inner shell, an outer shell, and a heat-insulating coating in the turbocharger volute structure, a sealed cavity is formed and filled with inert gas, solving the problem of poor heat insulation in the volute structure, improving engine energy utilization and structural reliability, and reducing manufacturing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FAW JIEFANG AUTOMOTIVE CO
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-07
AI Technical Summary
The existing turbocharger volute structure has poor heat insulation, resulting in low engine energy utilization.
The design employs a volute structure consisting of an inner shell, an outer shell, and a heat-insulating coating. A sealed cavity is formed between the inner and outer shells, and a heat-insulating coating is applied to the inner wall of the cavity and the outer wall of the outer shell. Multiple partition shells are combined to divide the cavity into sub-cavities, which are filled with inert gas.
It effectively reduces heat loss from high-temperature exhaust, improves engine energy utilization, reduces thermal stress on the volute structure, enhances reliability, and lowers manufacturing costs.
Smart Images
Figure CN224469187U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of turbocharger technology, and in particular to a volute structure for a turbocharger and a turbocharger. Background Technology
[0002] Currently, a turbocharger is a device that increases the amount of air entering the cylinder by compressing air, thereby improving the combustion efficiency of the cylinder. It mainly uses the inertial force of the exhaust gas from the engine to drive the turbine in the turbine housing. The rotation of the turbine drives the coaxial impeller, which compresses the air brought in by the air filter and pressurizes it before it enters the cylinder.
[0003] The volute is a crucial component of the turbocharger, connected to the exhaust manifold and tailpipe. It guides exhaust gases from the manifold to the turbine, driving its rotation, which in turn rotates the coaxial impeller, thus pressurizing the intake air. The temperature of the exhaust gases is typically above 700°C, and the energy contained within them must perform work on the turbine. The energy lost through heat radiation from the volute is essentially a loss in fuel consumption. Furthermore, the high-temperature heat radiation from the volute can affect other engine components, making heat insulation of the volute essential. In related technologies, the volute suffers from significant heat transfer losses, resulting in low engine energy utilization and consequently higher fuel consumption. Utility Model Content
[0004] The purpose of this invention is to provide a volute structure for a turbocharger and a turbocharger, so as to solve the problem that the heat insulation effect of the volute structure in the prior art is poor, resulting in low engine energy utilization.
[0005] On one hand, this utility model provides a volute structure for a turbocharger, the volute structure for a turbocharger comprising: a volute body having a flow cavity and an exhaust port that are interconnected; an inner shell connected to the volute body, the inner shell having an exhaust passage communicating with the flow cavity; an outer shell connected to the volute body, the outer shell being sleeved outside the inner shell, and a sealed cavity being formed between the inner shell, the outer shell, and the volute body; and a heat-insulating coating applied to the inner wall of the cavity and the outer wall of the outer shell.
[0006] As an optional technical solution for the volute structure of a turbocharger, the volute structure for a turbocharger further includes multiple partition shells, all of which are connected to the volute body and are distributed sequentially and at intervals between the inner shell and the outer shell. The multiple partition shells can divide the cavity into multiple sub-cavities.
[0007] As an optional technical solution for the volute structure of a turbocharger, the thickness of the partition housing is greater than 3 mm.
[0008] As an optional technical solution for the volute structure of a turbocharger, the thickness of the sub-cavity is greater than 2 mm.
[0009] As an optional technical solution for the volute structure of a turbocharger, the cavity is filled with an inert gas.
[0010] As an optional technical solution for the volute structure of a turbocharger, the thickness of the heat-insulating coating is 0.5mm-0.7mm.
[0011] As an optional technical solution for the volute structure of a turbocharger, the inner shell and the outer shell are connected to the volute body by welding.
[0012] As an optional technical solution for the volute structure of a turbocharger, both the inner shell and the outer shell are made of stainless steel.
[0013] As an optional technical solution for the volute structure of a turbocharger, the thickness of the inner shell and the outer shell is greater than 3 mm.
[0014] On the other hand, the present invention provides a turbocharger, including the volute structure for a turbocharger as described in any of the above embodiments.
[0015] The beneficial effects of this utility model are as follows:
[0016] This invention provides a volute structure for a turbocharger, comprising a volute body, an inner shell, an outer shell, and a heat-insulating coating. The volute body has an interconnected flow cavity and an exhaust port. Using the volute structure provided by this invention, a sealed cavity is formed between the inner shell, outer shell, and volute body. Simultaneously, the heat-insulating coating is applied to the inner wall of the cavity and the outer wall of the outer shell. This configuration effectively reduces heat loss from the high-temperature exhaust gas in the exhaust passage and flow cavity, retaining the heat in the high-temperature combustion gas, thereby allowing more energy to drive the turbine and improving engine energy utilization. Furthermore, it effectively reduces the temperature of the outer shell, thereby reducing thermal stress on the volute structure and improving its reliability. The volute structure of this invention effectively solves the problem of poor heat insulation in existing volute structures, leading to low engine energy utilization. Attached Figure Description
[0017] Figure 1 This is a cross-sectional view of the volute structure of the turbocharger in an embodiment of this utility model.
[0018] In the picture:
[0019] 1. Volute body; 12. Flow chamber; 13. Air outlet;
[0020] 2. Inner shell; 21. Exhaust passage;
[0021] 3. Outer shell;
[0022] 4. Cavity. Detailed Implementation
[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0027] like Figure 1 As shown, this embodiment provides a volute structure for a turbocharger, which includes a volute body 1, an inner shell 2, an outer shell 3, and a heat-insulating coating. The volute body 1 has a flow cavity 12 and an exhaust port 13 that are interconnected. The inner shell 2 is connected to the volute body 1 and has an exhaust passage 21 that communicates with the flow cavity 12. The outer shell 3 is connected to the volute body 1 and is fitted over the inner shell 2, forming a sealed cavity 4 between the inner shell 2, the outer shell 3, and the volute body 1. The heat-insulating coating is applied to the inner wall of the cavity 4 and the outer wall of the outer shell 3.
[0028] The turbocharger volute structure provided by this invention forms a sealed cavity between the inner shell 2, the outer shell 3, and the volute body 1. A heat-insulating coating is applied to the inner wall of the cavity 4 and the outer wall of the outer shell 3. This configuration effectively reduces heat loss from the high-temperature exhaust gas in the exhaust passage 21 and the flow chamber 12, retaining the heat in the high-temperature combustion gas. This allows for more energy to drive the turbine, improving engine energy utilization. Furthermore, it effectively reduces the temperature of the outer shell, thereby decreasing thermal stress on the volute structure and enhancing its reliability. The turbocharger volute structure of this invention effectively solves the problem of poor heat insulation in existing volute structures, leading to low engine energy utilization. The cavity 4 and the exhaust passage 21 are not interconnected.
[0029] In another embodiment (not shown in the figure), the volute structure for the turbocharger further includes multiple partition shells. These partition shells are all connected to the volute body 1 and are sequentially spaced between the inner shell 2 and the outer shell 3. The multiple partition shells divide the cavity 4 into multiple sub-cavities. This arrangement further improves the heat insulation effect of the volute structure for the turbocharger, thereby increasing the engine's energy utilization rate. The number of partition shells can be selected according to actual conditions to determine the number of sub-cavities.
[0030] Furthermore, the thickness of the separator housing is greater than 3mm. This design ensures the structural strength of the separator housing and improves the service life of the volute structure used in turbochargers.
[0031] In some embodiments, the thickness of the sub-cavity is greater than 2 mm. This configuration ensures the heat insulation effect of the sub-cavity.
[0032] In this embodiment, the cavity 4 is filled with an inert gas. The cavity 4 can be filled with an inert gas such as helium or nitrogen, which can prevent the metal in contact with it from oxidizing and turning black at high temperatures, thereby reducing heat radiation to the outside world and reducing the energy dissipation of high-temperature exhaust.
[0033] During the filling of inert gas, the cavity 4 is first evacuated through the filling port, and then inert gas is introduced. The pressure of the inert gas in the cavity 4 is monitored in real time during the filling process to ensure that the gas pressure in the cavity 4 is equivalent to the standard atmospheric pressure.
[0034] In some embodiments, the thickness of the heat-insulating coating is 0.5mm-0.7mm. Setting the thickness of the heat-insulating coating within the above-mentioned range ensures its heat insulation effect. Furthermore, the heat-insulating coating can reduce energy loss of high-temperature exhaust gas to the outside environment and can withstand temperatures up to 1080℃. The thickness of the heat-insulating coating can be selected according to actual conditions; specifically, the thickness can be 0.5mm, 0.6mm, or 0.7mm, etc.
[0035] In this embodiment, the inner shell 2 and the outer shell 3 are connected to the volute body 1 by welding. Compared with the traditional integral casting structure of the volute, this utility model adopts a welding process, which reduces the use of castings, lowers the overall manufacturing cost, and achieves lightweighting of the volute.
[0036] In some embodiments, both the inner housing 2 and the outer housing 3 are made of stainless steel. This design ensures the structural strength of the inner housing 2 and the outer housing 3, and improves the service life of the volute structure used in turbochargers.
[0037] Furthermore, the thickness of the inner shell 2 and the outer shell 3 is greater than 3mm. This design further ensures the structural strength of the inner shell 2 and the outer shell 3, and improves the service life of the volute structure used in turbochargers.
[0038] This embodiment also provides a turbocharger, including the volute structure for turbochargers described above. Using the turbocharger provided by this invention, a sealed cavity is formed between the inner shell 2, the outer shell 3, and the volute body 1. Simultaneously, a heat-insulating coating is applied to the inner wall of the cavity 4 and the outer wall of the outer shell 3. This configuration effectively reduces heat loss from the high-temperature exhaust gas in the exhaust passage 21 and the flow chamber 12, retaining the heat in the high-temperature combustion gas, thereby providing more energy to drive the turbine and improving engine energy utilization. Furthermore, it effectively reduces the temperature of the outer shell, thereby reducing thermal stress on the volute structure and improving its reliability. The turbocharger of this invention effectively solves the problem of poor heat insulation in existing volute structures, leading to low engine energy utilization. The cavity 4 and the exhaust passage 21 are not interconnected.
[0039] The advantages of this utility model are as follows:
[0040] 1. By using a cavity structure design and a heat-insulating coating, heat loss from high-temperature exhaust can be effectively reduced, while retaining heat in the high-temperature combustion gas, thus providing more energy to drive the turbine and improving engine energy utilization. 2. By improving the heat insulation effect, the temperature of the outermost layer of the volute can be effectively reduced, thereby reducing thermal stress and improving the reliability of the volute. 3. Compared with the commonly used integral casting structure of the volute, this solution adopts a welding process, reducing the use of castings, lowering the overall manufacturing cost, and achieving lightweighting of the volute.
[0041] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A volute structure for a turbocharger, characterized in that, include: The volute body (1) has a flow cavity (12) and an air outlet (13) that are interconnected; The inner shell (2) is connected to the volute body (1), and the inner shell (2) has an exhaust channel (21) communicating with the flow cavity (12); The outer shell (3) is connected to the volute body (1). The outer shell (3) is sleeved on the outside of the inner shell (2). A sealed cavity (4) is formed between the inner shell (2), the outer shell (3) and the volute body (1). A heat-insulating coating is applied to the inner wall of the cavity (4) and the outer wall of the outer shell (3).
2. The volute structure for a turbocharger according to claim 1, characterized in that, The volute structure for the turbocharger also includes multiple partition shells, each of which is connected to the volute body (1) and is distributed sequentially between the inner shell (2) and the outer shell (3). The multiple partition shells can divide the cavity (4) into multiple sub-cavities.
3. The volute structure for a turbocharger according to claim 2, characterized in that, The thickness of the partition shell is greater than 3 mm.
4. The volute structure for a turbocharger according to claim 2, characterized in that, The thickness of the sub-cavity is greater than 2 mm.
5. The volute structure for a turbocharger according to claim 1, characterized in that, The cavity (4) is filled with an inert gas.
6. The volute structure for a turbocharger according to claim 1, characterized in that, The thickness of the heat insulation coating is 0.5mm-0.7mm.
7. The volute structure for a turbocharger according to claim 1, characterized in that, The inner shell (2) and the outer shell (3) are connected to the volute body (1) by welding.
8. The volute structure for a turbocharger according to claim 1, characterized in that, Both the inner shell (2) and the outer shell (3) are made of stainless steel.
9. The volute structure for a turbocharger according to claim 1, characterized in that, The thickness of the inner shell (2) and the outer shell (3) is greater than 3 mm.
10. A turbocharger, characterized in that, Includes the volute structure for a turbocharger as described in any one of claims 1-9.