Connecting structure for preventing relative movement of turbine and turbine shaft

Abstract

The utility model relates to a connecting structure for preventing relative movement of a turbine and a turbine shaft, which comprises the turbine shaft, an impeller and the turbine, one end of the turbine shaft is connected with the impeller, the other end of the turbine shaft is connected with the turbine, and a rotation limiting structure is arranged between the turbine and the turbine shaft. The rotation limiting structure comprises a plurality of inner hole grooves formed in the turbine shaft hole and a multi-cylinder structure which is arranged on the outer surface of one end of the turbine shaft and copies the inner hole grooves. The multi-cylinder structure has the advantages that relative rotation of the turbine shaft and the turbine is effectively prevented due to limitation of the multi-cylinder structure.

Description

Technical Field

[0001] The present application belongs to the technical field of turbojet engines, and in particular, relates to a connection structure that prevents relative movement between a turbine and a turbine shaft. Background Art

[0002] Micro turbojet engines have been widely used in the fields of drones, model airplanes, etc. due to their small size, light weight, and high power density. However, existing micro turbojet engines usually use the interference fit between the shaft and the shaft hole to achieve a fixed connection between the turbine shaft and the compressor impeller; and the temperature of the post-combustion gas used by the micro turbojet engine to drive the turbine to rotate is usually 800-900 degrees Celsius, which causes the temperature of the turbine part itself to rise, and the turbine shaft hole is heated and expanded, making the shaft hole gap larger, which easily leads to relative rotation between the turbine shaft and the turbine, unstable connection, thus changing the dynamic balance of the rotor, affecting the normal operation of the turbojet engine, and even causing overall damage to the engine, further affecting the aircraft equipped with the engine as a power device, making it unable to work stably and reliably, thus bringing safety hazards. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to solve the hidden danger of the connection between the turbine shaft and the turbine caused by the interference fit between the shaft and the shaft hole in the prior art under high temperature and high speed working environment, thereby providing a connection structure that prevents the relative movement between the turbine and the turbine shaft.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A connection structure that prevents relative movement between a turbine and a turbine shaft comprises a turbine shaft, an impeller and a turbine, wherein one end of the turbine shaft is connected to the impeller and the other end is connected to the turbine, a rotation limiting structure is provided between the turbine and the turbine shaft, the rotation limiting structure comprises a plurality of inner hole grooves provided in the turbine shaft hole and a multi-cylindrical structure that is shaped like the inner hole grooves provided on the outer surface of one end of the turbine shaft, a turbine stopper sleeved on the connecting end of the turbine shaft is provided on the back of the turbine, a shaft sleeve nut sleeved on the connecting end of the turbine shaft is provided on the front of the turbine, the turbine stopper and the shaft sleeve nut both cover the inner hole groove portion to ensure the axial tightening of the turbine.

[0006] Furthermore, the rotation limiting structure includes a plurality of inner hole grooves opened in the turbine shaft hole and an outer hole groove corresponding to the inner hole groove provided on the outer surface of one end of the turbine shaft, and a positioning piece with matching shape is provided between the inner hole groove and the outer hole groove. The purpose of the positioning piece is to limit the relative rotation of the turbine shaft and the turbine.

[0007] Furthermore, the inner hole grooves are arc-shaped grooves arranged at intervals, and it is best if the center of the inner hole groove falls on the circumference of the turbine shaft hole, but it may not fall on the circumference of the turbine shaft hole.

[0008] Furthermore, there are at least three arc-shaped grooves, or more than three.

[0009] Furthermore, there are four arc-shaped grooves, preferably four evenly distributed ones, which can reduce the complexity of processing and improve the balance.

[0010] Furthermore, a rotation limiting structure is also provided between the impeller and the turbine shaft, and the same is true for the installation between the impeller and the turbine shaft. For a complete turbojet engine, the connection between the impeller and the turbine and the turbine shaft may all use this rotation limiting structure, or only one of the connections may use this structure.

[0011] Furthermore, the rotation limiting structure includes a plurality of inner hole grooves provided in the turbine shaft hole and a square column or polygonal column structure conforming to the inner hole grooves is provided on the outer surface of one end of the turbine shaft, and a wide range of inner hole grooves can be selected.

[0012] The beneficial effects of the utility model are:

[0013] The utility model provides a turbine shaft and turbine connection structure capable of preventing relative rotation, and realizes stable assembly between the turbine shaft and the turbine by providing an inner hole groove and a contoured multi-cylindrical structure. Even at high temperature, the turbine shaft and the turbine are effectively prevented from relative rotation due to the limitation of the multi-cylindrical structure.

[0014] The inner hole groove is an arc groove, and the multi-cylindrical structure is an outer protruding cylinder. The arc-shaped transition fit will not cause damage to the connection structure due to axial force even after long-term use, which greatly extends the service life and reduces the resulting safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution of the present application is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the present application;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the sleeveless nut of the first embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the arc groove and positioning member structure of the second embodiment of the present application;

[0019] Figure 4 is a schematic diagram of the three-dimensional structure of the turbine in the second embodiment of the present application;

[0020] The reference numerals in the figure are:

[0021] 1. turbine shaft, 2. impeller, 3. turbine, 4. rotation limiting structure, 5. outer hole groove, 6. inner hole groove, 7. multi-cylindrical structure, 8. turbine stopper, 9. positioning piece, 10. shaft sleeve nut. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the present utility model, unless otherwise specified, "multiple" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0025] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] Example

[0027] Embodiment 1

[0028] The present embodiment provides a connection structure for preventing relative movement between a turbine and a turbine shaft, comprising a turbine shaft 1, an impeller 2, and a turbine 3. One end of the turbine shaft 1 is connected to the impeller 2, and the other end is connected to the turbine 3. A rotation limiting structure 4 is provided between the turbine 3 and the turbine shaft 1. The rotation limiting structure 4 comprises a plurality of inner hole grooves 6 provided in the shaft hole of the turbine 3 and a multi-cylindrical structure 7 which is shaped like the inner hole groove 6 and is provided on the outer surface of one end of the turbine shaft 1; a turbine stopper 8 which is sleeved on the connecting end of the turbine shaft 1 is provided on the back of the turbine 3, and a shaft sleeve nut 10 which is sleeved on the connecting end of the turbine shaft 1 is provided on the front of the turbine 3. The turbine stopper 8 and the shaft sleeve nut 10 correspond to each other and both block a portion of the inner hole groove 6 to ensure the axial fastening of the turbine 3.

[0029] The inner hole groove 6 is an arc groove arranged at intervals, and there are at least three arc grooves, or more than three. The balance is good because the arc groove has a soft curve. When the turbine and the turbine shaft rotate axially, the axial force is balanced. The turbine and the turbine shaft are not easily damaged under long-term use. The center of the inner hole groove falls on the circumference of the turbine 3 shaft hole.

[0030] As an embodiment of the utility model, in addition to the above structure, the corresponding front and back sides of the impeller 2 are also provided with a sleeve nut 10 and a turbine stopper 8 to play the same role as them.

[0031] Embodiment 2

[0032] The present embodiment provides a connection structure for preventing relative movement between a turbine and a turbine shaft, comprising a turbine shaft 1, an impeller 2, and a turbine 3. One end of the turbine shaft 1 is connected to the impeller 2, and the other end is connected to the turbine 3. A rotation limiting structure 4 is provided between the turbine 3 and the turbine shaft 1. The rotation limiting structure 4 comprises a plurality of inner hole grooves 6 provided in the shaft hole of the turbine 3 and an outer hole groove 5 corresponding to the inner hole groove 6 provided on the outer surface of one end of the turbine shaft 1. A positioning member 9 with matching shapes is provided between the inner hole groove 6 and the outer hole groove 5. The purpose of the positioning member 9 is to limit the relative rotation between the turbine shaft 1 and the turbine. Preferably, the positioning member 9 is a roller needle-shaped structure; a turbine stopper 8 sleeved on the connecting end of the turbine shaft 1 is provided on the back of the turbine 3, and a shaft sleeve nut 10 sleeved on the connecting end of the turbine shaft 1 is provided on the front of the turbine 3. The turbine stopper 8 and the shaft sleeve nut 10 correspond to each other and both block part of the inner hole groove 6 to ensure the axial fastening of the turbine 3.

[0033] The inner hole grooves 6 are arc grooves arranged at intervals, because the arc grooves will not damage the turbine shaft, while grooves of other shapes are prone to damage the turbine and the turbine shaft after long-term use.

[0034] Here, the preferred number of arc grooves is four, preferably four evenly distributed, to reduce the complexity of processing and improve balance.

[0035] As an embodiment of the utility model, in addition to the above-mentioned structure, a rotation limiting structure 4 is also provided between the impeller 2 and the turbine shaft 1, and the same is true for the installation between the impeller 1 and the turbine shaft 2. For a complete turbojet engine, the rotation limiting structure 4 can be used in the connection between the impeller and the turbine, or only the connection at the turbine can use this structure.

[0036] As an embodiment of the utility model, in addition to the above structure, the corresponding front and back sides of the impeller 2 are also provided with a sleeve nut 10 and a turbine stopper 8 to play the same role as them.

[0037] As an embodiment of the utility model, in addition to the above-mentioned structure, the rotation limiting structure includes a plurality of inner hole grooves opened in the turbine shaft hole and a square column or polygonal column structure (not shown in the figure) that is shaped like the inner hole groove on the outer surface of one end of the turbine shaft, and the range of selectable inner hole grooves is wide.

[0038] Based on the above ideal embodiments of this application, the relevant staff can make various changes and modifications without departing from the technical concept of this application through the above description. The technical scope of this application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A connection structure for preventing relative movement between a turbine and a turbine shaft, comprising a turbine shaft, an impeller, and a turbine, wherein one end of the turbine shaft is connected to the impeller and the other end is connected to the turbine, and is characterized in that: A rotation limiting structure is provided between the turbine and the turbine shaft, and the rotation limiting structure includes a plurality of inner hole grooves opened in the turbine shaft hole and a multi-cylindrical structure which is shaped like the inner hole groove and is provided on the outer surface of one end of the turbine shaft. A turbine block which is sleeved on the connecting end of the turbine shaft is provided on the back of the turbine, and a shaft sleeve nut which is sleeved on the connecting end of the turbine shaft is provided on the front of the turbine, and the turbine block and the shaft sleeve nut both cover part of the inner hole groove.

2. A connection structure for preventing relative movement between a turbine and a turbine shaft according to claim 1, characterized in that: The rotation limiting structure includes a plurality of inner hole grooves provided in the turbine shaft hole and an outer hole groove corresponding to the inner hole groove provided on the outer surface of one end of the turbine shaft, and a positioning piece with matching shape is provided between the inner hole groove and the outer hole groove.

3. A connection structure for preventing relative movement between a turbine and a turbine shaft according to any one of claims 1 or 2, characterized in that: The inner hole grooves are arc-shaped grooves arranged at intervals.

4. A connection structure for preventing relative movement between a turbine and a turbine shaft according to claim 3, characterized in that: There are at least three arc-shaped grooves.

5. The connection structure for preventing relative movement between a turbine and a turbine shaft according to claim 3, characterized in that: There are four arc-shaped grooves.

6. A connection structure for preventing relative movement between a turbine and a turbine shaft according to any one of claims 4 or 5, characterized in that: A rotation limiting structure is also provided between the impeller and the turbine shaft.

7. The connection structure for preventing relative movement between a turbine and a turbine shaft according to claim 1, characterized in that: The rotation limiting structure comprises a plurality of inner hole grooves provided in the turbine shaft hole and a square column or polygonal column structure which is shaped like the inner hole grooves provided on the outer surface of one end of the turbine shaft.

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