Turboshaft engine integrated casing

Abstract

The present invention discloses an integrated casing of a turboshaft engine, comprising: an integrally formed casing body and an oil tank connected to the casing body. An inlet flow passage is provided in the casing body. An oil circuit and an anti-icing air flow passage are also integrated in the casing body. The oil inlet end of the oil circuit extends into the oil tank, so as to introduce the oil contained in the oil tank into the accessory transmission casing. The oil outlet end of the oil circuit is connected to the oil tank, so as to return the oil in the accessory transmission casing to the oil tank. The air inlet end of the anti-icing air flow passage extends into the oil tank and penetrates the oil tank, so as to connect a pipeline for supplying anti-icing air externally, so that hot anti-icing air enters the anti-icing air flow passage and then heats and de-ices the inner and outer annular surfaces of the inlet flow passage, respectively. The integrated casing of the present invention has a high degree of integration, does not need to add additional components for anti-icing and providing oil, has a small number of components, and has a relatively simple structure. Therefore, the number of interfaces is small and it is not easy to leak air or oil, thereby improving the reliability of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation turboshaft engines, and in particular to an integrated casing of a turboshaft engine. Background Art

[0002] The casing is located at the front end of the turboshaft engine and is directly connected to the aircraft's air inlet. The main functions of the current turboshaft engine casing include: providing uniform airflow for the compressor, providing front support for the gas generator rotor, and providing installation interfaces for some components.

[0003] The existing turboshaft engine casing mainly provides uniform airflow for the aircraft compressor and provides installation interfaces for some parts. However, when the engine is actually working in cold areas, it needs to be anti-iced. The traditional anti-icing method is to introduce anti-icing gas into the casing through additional pipelines for anti-icing; and the engine needs a lubricating oil tank to provide lubricating oil for engine operation. The traditional lubricating oil tank is a separate part, which is mounted on the engine and connected to additional pipelines to complete oil supply and return.

[0004] Under traditional technology, whether it is anti-icing or lubricating oil tanks and oil circuits, additional parts need to be designed to complete the anti-icing and lubricating oil supply tasks, which increases the number of parts, resulting in a complex engine structure and more interfaces, which reduces engine reliability and increases the risk of air and oil leakage. Summary of the invention

[0005] The present invention provides an integrated casing for a turboshaft engine to solve the technical problems that existing turboshaft engines have a large number of parts, resulting in a complex engine structure and a large number of interfaces, which reduces engine reliability and increases the risk of air and oil leakage.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A turboshaft engine integrated casing comprises: an integrally formed casing body and an oil box connected to the casing body; an annular intake airflow passage extending axially therethrough and being arranged in the casing body is arranged in the casing body, so as to provide a uniform compressed airflow for a compressor arranged at the exhaust end of the casing body; an oil circuit and an anti-icing airflow passage are also integrated in the casing body, the oil circuit is also connected to an accessory transmission casing connected to the casing body, the oil inlet end of the oil circuit extends into the oil box, so as to introduce the oil contained in the oil box outwardly into the accessory transmission casing, the oil outlet end of the oil circuit is connected to the oil box, so as to return the oil of the accessory transmission casing to the oil box; the air inlet end of the anti-icing airflow passage extends into the oil box and is penetrated by the oil box, so as to be connected to an external pipeline for supplying anti-icing air, so that hot anti-icing air enters the anti-icing airflow passage and then heats and de-ices the inner and outer annular surfaces of the air inlet passage respectively.

[0008] Furthermore, the casing body includes an inner tube and an outer tube which are fitted together and both are hollow cylindrical, and a support plate connected between the inner tube and the outer tube; the first end of the inner tube is located inside the outer tube, the second end of the inner tube opposite to the inner tube extends axially out of the outer tube, and the annular gap between the inner tube and the outer tube forms an inlet flow channel; the lubricating oil tank includes an oil tank outer shell with an opening at the top, and the opening of the oil tank outer shell is connected to the outer annular surface of the outer tube to form a closed lubricating oil tank.

[0009] Furthermore, the casing body includes a tail casing, a rear casing, a middle casing and a front casing which are arranged in sequence along the direction from the exhaust end to the air inlet end; the lubricating oil circuit is arranged in the tail casing, and its oil inlet end extends into the lubricating oil tank; the anti-icing air flow path is arranged in the middle casing, and its air inlet end extends into the lubricating oil tank and passes through the oil tank outer shell.

[0010] Furthermore, the lubricating oil circuit includes an oil inlet circuit, an oil suction circuit and an oil return circuit; the oil inlet circuit is integrated in the lubricating oil tank, and the oil inlet end of the oil inlet circuit extends to the bottom of the lubricating oil tank; the oil suction circuit and the oil return circuit are respectively integrated in the outer cylinder of the tail section casing, and the oil inlet end of the oil suction circuit is connected to the oil outlet end of the oil inlet circuit, and the oil outlet end of the oil suction circuit extends upward from the outer cylinder for connection with the accessory transmission casing; the oil inlet end of the oil return circuit extends upward from the outer cylinder for connection with the accessory transmission casing, and the oil outlet end of the oil return circuit passes downward through the outer cylinder and then connects to the lubricating oil tank.

[0011] Furthermore, the integrated casing of the turboshaft engine also includes two accessory transmission mounting platforms integrated on the outer ring surface of the outer tube of the tail section casing; one of the accessory transmission mounting platforms is respectively passed through the oil outlet end of the oil suction circuit and the oil inlet end of the oil return circuit.

[0012] Furthermore, the bottom of the oil tank gradually extends inward from the four sides toward the middle to form a concave bottom, and the oil inlet end of the oil inlet passage extends vertically downward and then is inserted into the concave bottom; the integrated casing of the turboshaft engine also includes an oil filter mounting seat integrated on the front end surface of the oil tank, and an oil drain valve mounting seat integrated on the rear end surface of the oil tank; the oil filter mounting seat is used to install an oil filter assembly for filtering the oil, and the oil filter mounting seat is arranged corresponding to the oil inlet end of the oil inlet passage, so as to allow the oil filter assembly installed on the oil filter mounting seat to extend into the oil inlet end of the oil inlet passage; the oil drain valve mounting seat is used to install the oil drain valve.

[0013] Furthermore, the integrated casing of the turboshaft engine also includes a sensor mounting seat integrated on the outer ring surface of the outer tube of the rear section casing; the sensor mounting seat is used to install the sensor, and the sensor is radially penetrated through the rear section casing and then extends into the inner cavity of the inner tube.

[0014] Furthermore, the anti-icing air flow path includes an outer ring flow path which is integrated in the outer tube of the middle section casing and is in a ring shape, an inner ring flow path which is integrated in the inner tube of the middle section casing and is in a ring shape, a support plate flow path which is integrated in the support plate of the middle section casing and connects the outer ring flow path and the inner ring flow path, and an air intake path which is integrated in the lubricating oil tank; the air inlet end of the air intake path passes through the outer shell of the oil tank, and the opposite air outlet end thereof is connected to the outer ring flow path.

[0015] Furthermore, the integrated casing of the turboshaft engine also includes an anti-icing air bleed pipe mounting seat integrated on the rear end surface of the lubricating oil tank, and a process hole seat integrated on the outer surface of the outer tube of the middle section casing; the anti-icing air bleed pipe mounting seat is connected to the air inlet end of the bleed air path; and a plurality of process holes connected to the outer ring flow path are opened on the process hole seat.

[0016] Furthermore, an annular cleaning ring cavity is integrated in the outer tube of the front section casing; the integrated casing of the turboshaft engine also includes a cleaning nozzle mounting seat and a lifting ear mounting seat integrated on the outer ring surface of the outer tube of the front section casing, and the cleaning nozzle mounting seat is processed with a water inlet connected to the cleaning ring cavity; the inner ring surface of the outer tube of the front section casing is processed with drainage holes arranged in sequence along the circumferential direction and connected to the cleaning ring cavity.

[0017] Furthermore, the integrated casing of the turboshaft engine also includes two oil mark mounting seats and two fuel filler cap mounting seats integrated on the left and right sides of the lubricating oil tank; the oil mark mounting seat is used to install the oil mark for observing the oil height in the lubricating oil tank; the two fuel filler cap mounting seats are used to install the fuel filler cap and the fuel filler plug cap respectively.

[0018] The present invention has the following beneficial effects:

[0019] In the integrated casing of the turboshaft engine of the present invention, the casing body and the lubricating oil box are integrally formed, and a lubricating oil circuit and an anti-icing air flow path are integrated in the casing body. The lubricating oil circuit is used to lead the lubricating oil in the lubricating oil box to the accessory transmission casing connected to the casing body, and to introduce the return oil in the accessory transmission casing into the lubricating oil box. The anti-icing air flow path is used to introduce external hot anti-icing air into the casing body to heat and de-ice the inner and outer annular surfaces of the inlet flow passage, respectively. Therefore, the integrated casing of the present invention provides high-quality airflow to the compressor through the inlet flow passage, and also Anti-icing gas is introduced through the internally integrated anti-icing air flow path, thereby preventing ice from forming on the surface of the intake air flow path to affect the engine performance. At the same time, the internally integrated lubricating oil tank can store lubricating oil, and the circulation of lubricating oil is realized through the lubricating oil circuit which is also integrated in the casing body. That is, the integrated casing of the present invention integrates the intake air flow path, the anti-icing air flow path, the lubricating oil circuit and the lubricating oil tank at the same time, with a high degree of integration. There is no need to add additional components for anti-icing and providing lubricating oil. The number of parts is small and the structure is relatively simple. Therefore, there are few interfaces and it is not easy to leak air or oil, thereby improving the reliability of the engine.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 The space diagram of the integrated casing of the turboshaft engine of the preferred embodiment of the present invention is Figure 1 ;

[0023] Figure 2 The space diagram of the integrated casing of the turboshaft engine of the preferred embodiment of the present invention is Figure 2 ;

[0024] Figure 3 1 is a schematic diagram of a top view of the integrated casing of a turboshaft engine according to a preferred embodiment of the present invention;

[0025] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure in the middle AA direction;

[0026] Figure 5 yes Figure 3 BB-direction cross-sectional structural diagram;

[0027] Figure 6 yes Figure 3 Schematic diagram of the cross-sectional structure in CC direction;

[0028] Figure 7 yes Figure 3 DD-direction cross-sectional structural diagram;

[0029] Figure 8 yes Figure 3 EE-direction cross-sectional structural diagram;

[0030] Fig. 9 yes Figure 3 Schematic diagram of the cross-sectional structure in the FF direction.

[0031] Legend:

[0032] 10. Casing body; 101. Intake air passage; 102. Cleaning ring cavity; 103. Drain hole; 11. Inner tube; 12. Outer tube; 13. Support plate; 20. Lubricating oil tank; 30. Lubricating oil circuit; 31. Oil inlet circuit; 32. Oil suction circuit; 33. Oil return circuit; 40. Anti-icing air flow path; 41. Outer ring flow path; 42. Inner ring flow path; 43. Support plate flow path; 44. Air bleed path; 50. Accessory transmission mounting platform; 60. Lubricating oil filter mounting seat; 70. Oil drain valve mounting seat; 80. Sensor mounting seat; 90. Anti-icing air bleed pipe mounting seat; 110. Process hole seat; 120. Cleaning nozzle mounting seat; 130. Lifting ear mounting seat; 140. Oil mark mounting seat; 150. Fuel filler cap mounting seat. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0034] Reference Figure 1-3 The preferred embodiment of the present invention provides an integrated casing of a turboshaft engine, comprising: an integrally formed casing body 10 and an oil box 20 connected to the casing body 10. The casing body 10 is provided with an annular inlet flow passage 101 extending through the casing body 10 in its axial direction, so as to provide a uniform compressed air flow for the compressor arranged at the exhaust end of the casing body 10. The casing body 10 is also integrated with an oil circuit 30 and an anti-icing air flow passage 40. The oil circuit 30 is also connected to the accessory transmission casing connected to the casing body 10. The oil inlet end of the oil circuit 30 extends into the oil box 20, so as to introduce the oil contained in the oil box 20 into the accessory transmission casing. The oil outlet end of the oil circuit 30 is connected to the oil box 20, so as to return the oil of the accessory transmission casing to the oil box 20. The air inlet end of the anti-icing air flow path 40 extends into the lubricating oil box 20 and passes through the lubricating oil box 20 to connect to an external pipeline for supplying anti-icing air, so that hot anti-icing air enters the anti-icing air flow path 40 and then heats the inner and outer annular surfaces of the inlet flow channel 101 respectively for anti-icing.

[0035] In the integrated casing of the turboshaft engine of the present invention, the casing body 10 and the lubricating oil box 20 are integrally formed, and the casing body 10 is also integrated with a lubricating oil circuit 30 and an anti-icing air flow path 40. The lubricating oil circuit 30 is used to lead the lubricating oil in the lubricating oil box 20 to the accessory transmission casing connected to the casing body 10, and to introduce the return oil in the accessory transmission casing into the lubricating oil box 20. The anti-icing air flow path 40 is used to introduce external hot anti-icing air into the casing body 10, so as to heat and de-ice the inner and outer annular surfaces of the inlet flow channel 101, respectively, so that the integrated casing of the present invention provides high-quality airflow for the compressor through the inlet flow channel 101. At the same time, anti-icing gas is introduced through the internally integrated anti-icing air flow path 40 to prevent ice from forming on the surface of the inlet flow channel 101 to affect the engine performance. At the same time, the internally integrated lubricating oil tank 20 can store lubricating oil, and the lubricating oil circulation work is realized through the lubricating oil circuit 30 which is also integrated in the casing body 10. That is, the integrated casing of the present invention integrates the inlet flow channel 101, the anti-icing air flow path 40, the lubricating oil circuit 30 and the lubricating oil tank 20 at the same time, with a high degree of integration. There is no need to add additional components for anti-icing and providing lubricating oil. The number of parts is small and the structure is relatively simple. Therefore, there are few interfaces and it is not easy to leak air or oil, thereby improving the reliability of the engine.

[0036] Alternatively, if Fig. 9 As shown, the casing body 10 has an integrated inlet flow passage 101. The flow passage profile of the inlet flow passage 101 shrinks along the axial direction as a whole. The shrinkage ratio has different requirements for different engines. The inlet flow passage 101 needs to provide an airflow that meets the requirements for the rear compressor.

[0037] Alternatively, if Figure 8 and Fig. 9 As shown, the anti-icing air flow path 40, the lubricating oil circuit 30, the lubricating oil box 20 and the casing body 10 are all formed when the casing is cast as a whole, thereby reducing the difficulty of later setting up and connecting the anti-icing air pipeline, the lubricating oil pipeline and the lubricating oil box, and making the overall structure of the casing simple and the number of parts small, thereby reducing the overall weight of the casing and reducing the number of external interfaces, thereby reducing the risk of engine air and oil leakage and improving the reliability of the engine.

[0038] Alternatively, if Figure 1-2 and Fig. 9As shown, the casing body 10 includes an inner tube 11 and an outer tube 12 which are arranged in an inner and outer manner and are both hollow cylindrical, and a support plate 13 connected between the inner tube 11 and the outer tube 12. The first end of the inner tube 11 is located inside the outer tube 12, and the second end of the inner tube 11 opposite to the inner tube 11 extends out of the outer tube 12 along the axial direction, and the annular gap between the inner tube 11 and the outer tube 12 forms an inlet flow channel 101. The oil tank 20 includes an oil tank shell with an opening at the top, and the opening of the oil tank shell is sealed and connected to the outer annular surface of the outer tube 12 to form a closed oil tank 20. In this optional solution, there are multiple support plates 13, and the multiple support plates 13 are evenly spaced along the circumferential direction. The support plates 13 connect the inner and outer annular surfaces of the inlet air duct 101, support the casing body 10, and provide space for the anti-icing air duct 40 and subsequent sensors and other structures. Generally, 4 to 5 support plates 13 are arranged. Too many support plates 13 will affect the flow of air in the inlet air duct 101, and too few support plates 13 will be inconvenient for the arrangement of the internal structure and the supporting strength of the structure will be low.

[0039] Alternatively, if Figure 3 As shown, the casing body 10 includes a tail casing, a rear casing, a middle casing and a front casing which are sequentially arranged along the direction from the exhaust end to the intake end thereof, and Figure 3 The AA section position is the tail section casing, the BB section position is the rear section casing, the CC section position is the middle section casing, and the DD section position is the front section casing. The oil circuit 30 is arranged in the tail section casing, and its oil inlet end extends into the oil tank 20. The anti-icing air flow path 40 is arranged in the middle section casing, and its air inlet end extends into the oil tank 20 and passes through the oil tank shell.

[0040] Alternatively, if Figure 4 As shown, the lubricating oil circuit 30 includes an oil inlet circuit 31, an oil suction circuit 32 and an oil return circuit 33. The oil inlet circuit 31 is integrated into the lubricating oil box 20, and the oil inlet end of the oil inlet circuit 31 extends to the bottom of the lubricating oil box 20. The oil suction circuit 32 and the oil return circuit 33 are respectively integrated into the outer cylinder 12 of the tail section casing, and the oil inlet end of the oil suction circuit 32 is connected to the oil outlet end of the oil inlet circuit 31, and the oil outlet end of the oil suction circuit 32 extends upward from the outer cylinder 12 to be connected to the accessory transmission casing. The oil inlet end of the return circuit 33 extends upward from the outer cylinder 12 to be connected to the accessory transmission casing, and the oil outlet end of the return circuit 33 passes through the outer cylinder 12 downward and connects to the lubricating oil box 20. During operation, the lubricating oil in the lubricating oil tank 20 passes through the oil inlet path 31 and the oil suction path 32 in turn and enters the accessory transmission casing connected to the casing body 10, while the lubricating oil in the accessory transmission casing flows back to the lubricating oil tank 20 through the oil return path 33, thereby providing a lubricating oil circulation path for the engine through the setting of the lubricating oil circuit 30.

[0041] Furthermore, if Figure 2 and Figure 4As shown, the integrated casing of the turboshaft engine also includes two accessory transmission mounting platforms 50 integrated on the outer annular surface of the outer tube 12 of the tail section casing. The oil outlet end of the oil suction circuit 32 and the oil inlet end of the oil return circuit 33 are respectively penetrated by one of the accessory transmission mounting platforms 50. The accessory transmission mounting platform 50 is located at the rear end of the casing body 10 and can be used to install the accessory transmission casing. The internal lubricating oil circuit 30 provides lubricating oil to the accessory transmission casing through the accessory transmission mounting platform 50. During actual connection, there is a circle of rubber ring groove outside the oil return circuit 33 of the accessory transmission mounting platform 50. When assembling the accessory transmission casing, an O-ring is installed to achieve oil circuit sealing; the oil suction circuit 32 of the accessory transmission mounting platform 50 is sealed by installing a pipe joint with a rubber ring.

[0042] Preferably, if Figure 4 As shown, the bottom of the oil tank 20 gradually extends inward from the periphery thereof to the middle to form a concave bottom, and the oil inlet end of the oil inlet passage 31 extends vertically downward and then is inserted into the concave bottom; in this preferred embodiment, the oil tank 20 is integrated below the casing body 10 to store and provide oil for the engine; the bottom of the oil tank 20 is designed to protrude in the middle to form a concave bottom, so that the oil inlet of the oil inlet passage 31 is located at the lowest end of the oil tank 20, which is convenient for absorbing the oil and increases the proportion of available volume at large attitude angles.

[0043] Preferably, if Figure 1-2 and Fig. 9 As shown, the integrated casing of the turboshaft engine also includes an oil filter mounting seat 60 integrated on the front end surface of the oil tank 20, and an oil drain valve mounting seat 70 integrated on the rear end surface of the oil tank 20. The oil filter mounting seat 60 is used to install an oil filter assembly for filtering the oil. The oil filter mounting seat 60 is arranged corresponding to the oil inlet end of the oil inlet passage 31 so as to allow the oil filter assembly installed on the oil filter mounting seat 60 to extend into the oil inlet end of the oil inlet passage 31. The oil drain valve mounting seat 70 is used to install the oil drain valve. In this preferred embodiment, Figure 1 and Fig. 9 As shown, the oil filter mounting seat 60 is located at the bottom of the oil tank 20, with threaded holes on both sides for fixing the oil filter assembly, and the center line of the middle mounting hole is in line with the center line of the entrance of the oil inlet 31. By installing the oil filter assembly and inserting the oil filter assembly into the oil inlet 31, the filter screen on the oil filter assembly can filter impurities for the oil inlet 31, ensuring that the oil provided for lubrication of the engine is pure enough to prevent foreign matter from wearing the rotating parts. In this preferred solution, Figure 2 As shown, the oil drain valve mounting seat 70 is located at the bottom end of the back of the casing body 10, and the lubricating oil in the oil tank 20 can be discharged by opening the oil drain valve.

[0044] Alternatively, if Figure 2 and Figure 5As shown, the integrated casing of the turboshaft engine also includes a sensor mounting seat 80 integrated on the outer annular surface of the outer cylinder 12 of the rear casing. The sensor mounting seat 80 is used to install the sensor, and the sensor is radially inserted through the rear casing and then extends into the inner cavity of the inner cylinder 11. In this optional solution, both sides of the sensor mounting seat 80 are threaded holes for fixing the sensor, and the middle hole passes through the support plate 13 to the inner cavity of the inner cylinder 11, so that the sensor probe can directly penetrate into the inner cavity.

[0045] Alternatively, if Figure 6 and Figure 8-9 As shown, the anti-icing air flow path 40 includes an outer annular flow path 41 integrated in the outer cylinder 12 of the middle casing, an inner annular flow path 42 integrated in the inner cylinder 11 of the middle casing, a support plate flow path 43 integrated in the support plate 13 of the middle casing and connecting the outer annular flow path 41 and the inner annular flow path 42, and an air inlet path 44 integrated in the oil tank 20. The air inlet end of the air inlet path 44 passes through the oil tank shell, and the opposite air outlet end thereof is connected to the outer annular flow path 41.

[0046] Preferably, if Figure 2 and Figure 8 As shown, the integrated casing of the turboshaft engine also includes an anti-icing air bleed pipe mounting seat 90 integrated on the rear end surface of the lubricating oil box 20, and a process hole seat 110 integrated on the outer surface of the middle casing outer tube 12. The anti-icing air bleed pipe mounting seat 90 is connected to the air inlet end of the bleed air path 44; in this preferred embodiment, the inlet of the anti-icing air path 40, that is, the anti-icing air bleed pipe mounting seat 90 is located at the rear end of the casing body 10, and hot air can be connected from the compressor as anti-icing air, thereby improving energy utilization, and the support plate 13 at the middle casing is hollow, and the inner cavity of the support plate 13 is connected to the outer annular flow path 41 and the inner annular flow path 42, and the support plate 13 is also heated for anti-icing.

[0047] Preferably, if Figure 2 and Figure 6 As shown, a plurality of process holes connected to the outer annular flow path 41 are formed on the process hole seat 110. In this preferred embodiment, the process hole seat 110 is provided on the outer side of the casing body 10. Since the anti-icing air flow path 40 has a complex structure and there are excess materials inside after casting, it is difficult to remove them. Therefore, the process hole seat 110 with process holes is provided, and the excess materials in the anti-icing air flow path 40 can be removed through the process holes. The process hole is blocked by a plug in actual use.

[0048] Alternatively, if Figure 1 and Figure 7As shown, an annular cleaning ring cavity 102 is integrated in the outer cylinder 12 of the front section casing. The integrated casing of the turboshaft engine also includes a cleaning nozzle mounting seat 120 and a lifting ear mounting seat 130 integrated on the outer ring surface of the outer cylinder 12 of the front section casing. The cleaning nozzle mounting seat 120 is processed with a water inlet connected to the cleaning ring cavity 102. The inner ring surface of the outer cylinder 12 of the front section casing is processed with drainage holes 103 arranged in sequence along the circumferential direction and connected to the cleaning ring cavity 102. In this optional solution, a cleaning nozzle is connected to the cleaning nozzle mounting seat 120, and the cleaning liquid is injected into the cleaning ring cavity 102 by the cleaning nozzle, and then sprayed into the intake air channel 101 through the whole circle of drainage holes 103, thereby completing the cleaning of the engine; the lifting ear mounting seat 130 can be used to install the lifting ear.

[0049] Alternatively, if Figure 1 and Figure 2 As shown, the integrated casing of the turboshaft engine also includes two oil mark mounting seats 140 and two oil filler cap mounting seats 150 integrated on the left and right sides of the oil tank 20. The oil mark mounting seat 140 is used to install an oil mark for observing the oil height in the oil tank 20. The two oil filler cap mounting seats 150 are used to install the oil filler cap and the oil filler plug cap respectively. In this optional solution, an oil mark mounting seat 140 is provided on each side of the oil tank 20 for installing the oil mark, so that the oil amount can be observed through the transparent plate of the oil mark when the engine is installed on different sides. A oil filler cap mounting seat 150 is also provided on each side of the oil tank 20. According to the installation position of the engine, the oil filler cap and the oil filler plug cap are respectively installed on the two oil filler cap mounting seats 150 on the left and right sides of the oil tank 20. The oil tank 20 can be filled with oil by opening the oil filler cap, and the oil filler cap mounting seat 150 is tilted outward to facilitate the installation of the oil filler cap and the oil filler plug cap.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A turboshaft engine integrated casing, characterized in that: include: An integrally formed casing body (10) and an oil tank (20) connected to the casing body (10); The casing body (10) is provided with an annular intake air passage (101) extending through the casing body along its axial direction, so as to provide a uniform compressed air flow for a compressor arranged at the exhaust end of the casing body (10). The casing body (10) comprises an inner cylinder (11) and an outer cylinder (12) which are arranged in an inner and outer manner and are both hollow cylinders, and a support plate (13) connected between the inner cylinder (11) and the outer cylinder (12). The casing body (10) is divided into a tail section casing, a rear section casing, a middle section casing and a front section casing in sequence from the exhaust end to the intake end. An oil circuit (30) and an anti-icing air flow path (40) are also integrated in the casing body (10). The oil circuit (30) is also connected to an accessory transmission casing connected to the casing body (10). An oil inlet end of the oil circuit (30) extends into an oil tank (20) so as to introduce the oil contained in the oil tank (20) into the accessory transmission casing. An oil outlet end of the oil circuit (30) is connected to the oil tank (20) so as to return the oil in the accessory transmission casing to the oil tank (20). The anti-icing air flow path (40) comprises an outer annular flow path (41) integrated in an outer tube (12) of a mid-section casing, an inner annular flow path (42) integrated in an inner tube (11) of the mid-section casing, a support plate flow path (43) integrated in a support plate (13) of the mid-section casing and connecting the outer annular flow path (41) and the inner annular flow path (42), and an air bleed path (44) integrated in an oil tank (20). An air inlet end of the air bleed path (44) penetrates an oil tank shell to connect to an external pipeline for supplying anti-icing air, and an air outlet end of the air bleed path (44) is connected to the outer annular flow path (41) so that hot anti-icing air enters the anti-icing air flow path (40) and heats the inner annular surface and the outer annular surface of the air inlet channel (101) to prevent icing.

2. The turboshaft engine integrated casing according to claim 1, characterized in that: The first end of the inner cylinder (11) is located inside the outer cylinder (12), the second end of the inner cylinder (11) extends out of the outer cylinder (12) along the axial direction, and the annular gap between the inner cylinder (11) and the outer cylinder (12) forms an inlet flow channel (101); The lubricating oil tank (20) comprises an oil tank shell with an opening at the top, and the opening of the oil tank shell is connected to the outer annular surface of the outer cylinder (12) to form a closed lubricating oil tank (20).

3. The turboshaft engine integrated casing according to claim 2, characterized in that: The lubricating oil circuit (30) is arranged in the tail section casing, and its oil inlet end extends into the lubricating oil tank (20); The anti-icing air flow path (40) is arranged in the middle casing, and its air inlet end extends into the lubricating oil tank (20) and penetrates the oil tank outer shell.

4. The turboshaft engine integrated casing according to claim 3, characterized in that: The lubricating oil circuit (30) comprises an oil inlet circuit (31), an oil suction circuit (32) and an oil return circuit (33); The oil inlet passage (31) is integrated into the lubricating oil tank (20), and the oil inlet end of the oil inlet passage (31) extends to the bottom of the lubricating oil tank (20); The oil suction circuit (32) and the oil return circuit (33) are respectively integrated in the outer cylinder (12) of the tail section casing, and the oil inlet end of the oil suction circuit (32) is connected to the oil outlet end of the oil inlet circuit (31), and the oil outlet end of the oil suction circuit (32) extends upward from the outer cylinder (12) to be connected to the accessory transmission casing; The oil inlet end of the oil return passage (33) extends upward from the outer cylinder (12) to be connected to the accessory transmission casing, and the oil outlet end of the oil return passage (33) passes downward from the outer cylinder (12) to be connected to the lubricating oil tank (20).

5. The turboshaft engine integrated casing according to claim 4, characterized in that: The turboshaft engine integrated casing also includes two accessory transmission mounting platforms (50) integrated on the outer annular surface of the outer cylinder (12) of the tail section casing; The oil outlet end of the oil suction circuit (32) and the oil inlet end of the oil return circuit (33) are respectively penetrated by one of the accessory transmission mounting platforms (50).

6. The turboshaft engine integrated casing according to claim 4, characterized in that: The bottom of the lubricating oil box (20) is gradually extended inward from the periphery thereof to the middle to form a concave bottom, and the oil inlet end of the oil inlet passage (31) extends vertically downward and is inserted into the concave bottom; The integrated casing of the turboshaft engine also includes an oil filter mounting seat (60) integrated on the front end surface of the oil tank (20), and an oil drain valve mounting seat (70) integrated on the rear end surface of the oil tank (20); The lubricating oil filter mounting seat (60) is used to mount a lubricating oil filter assembly for filtering lubricating oil. The lubricating oil filter mounting seat (60) is arranged corresponding to the oil inlet end of the oil inlet passage (31) so as to allow the lubricating oil filter assembly mounted on the lubricating oil filter mounting seat (60) to extend into the oil inlet end of the oil inlet passage (31); The oil drain valve mounting seat (70) is used to mount the oil drain valve.

7. The turboshaft engine integrated casing according to claim 3, characterized in that: The turboshaft engine integrated casing also includes a sensor mounting seat (80) integrated on the outer annular surface of an outer cylinder (12) of the rear casing; The sensor mounting seat (80) is used to mount the sensor, and the sensor is radially inserted through the rear casing and then extends into the inner cavity of the inner tube (11).

8. The turboshaft engine integrated casing according to claim 1, characterized in that: The integrated casing of the turboshaft engine also includes an anti-icing air bleed pipe mounting seat (90) integrated on the rear end surface of the lubricating oil tank (20), and a process hole seat (110) integrated on the outer surface of the middle casing outer cylinder (12); The anti-icing air bleed pipe mounting seat (90) is connected to the air inlet end of the air bleed air path (44); The process hole seat (110) is provided with a plurality of process holes connected to the outer annular flow path (41).

9. The turboshaft engine integrated casing according to claim 3, characterized in that: An annular cleaning ring cavity (102) is integrated in the outer cylinder (12) of the front casing; The integrated casing of the turboshaft engine further comprises a cleaning nozzle mounting seat (120) and a lifting lug mounting seat (130) integrated on the outer ring surface of the outer cylinder (12) of the front casing, and a water inlet communicating with the cleaning ring cavity (102) is processed on the cleaning nozzle mounting seat (120); The inner ring surface of the outer cylinder (12) of the front casing is processed with drainage holes (103) which are arranged in sequence along the circumferential direction and connected to the cleaning ring cavity (102).

10. The turboshaft engine integrated casing according to claim 1, characterized in that: The turboshaft engine integrated casing also includes two oil mark mounting seats (140) and two oil filler cap mounting seats (150) integrated on the left and right sides of the lubricating oil tank (20); The oil mark mounting seat (140) is used to mount an oil mark for observing the oil level in the oil tank (20); The two fuel filler cap mounting seats (150) are used to respectively mount the fuel filler cap and the fuel filler plug cap.

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