Split type casing and auxiliary power device

Abstract

The invention provides a split type cartridge receiver and an auxiliary power device, and belongs to the technical field of cartridge receiver devices, and the split type cartridge receiver comprises a first cartridge receiver and a second cartridge receiver which are connected; the first casing and the second casing are made of different materials; the first casing comprises a first casing barrel, a first connecting end is arranged at one end of the first casing barrel, and a sealing groove is formed in the first connecting end; the second casing comprises a second casing barrel, a second connecting end is arranged at one end, close to the first casing, of the second casing barrel, and the second connecting end is buckled with the first connecting end; and hoops are mounted on the outer sides of the first connecting end and the second connecting end. The first casing and the second casing are made of different materials, so that the technical problem that the casing is heavier due to the adoption of high-temperature alloy materials with higher density and thicker wall thickness is solved, and meanwhile, the requirements of heat radiation brought by fuel oil combustion and containing fragments of a turbine rotor wheel disc are met.

Description

Technical Field

[0001] The invention belongs to the technical field of casing devices, and in particular relates to a split casing and an auxiliary power device. Background Art

[0002] Auxiliary Power Unit (APU) is a gas turbine engine that mainly provides compressed air and power for the aircraft and is an important airborne equipment.

[0003] During the operation of the APU, the high-pressure air flow from the compressor is rectified by the axial diffuser and then enters the flame tube to mix with the fuel and then burn. The high-temperature combustion gas impacts the turbine rotor, and the turbine rotor rotates at high speed. At this time, according to the different internal installation objects, the casing is divided into the "cold end" and "hot end" areas:

[0004] 1) The internal space of the "cold end" area is used to install the axial diffuser. Since there are no combustion and rotating parts, the requirements for the temperature of the casing wall in this area and the containment of rotor fragments are lower;

[0005] 2) The internal space of the "hot end" area is used to install the flame tube and turbine rotor. Due to the presence of combustion and high-speed rotating components, the requirements for the casing wall in this area to be gentle and contain rotor fragments are high.

[0006] In order to withstand the heat radiation caused by fuel combustion and contain the fragments of the turbine rotor, the casing is usually made of high-temperature alloy materials and thicker walls. The overall use of high-density high-temperature materials and thicker walls will result in a heavier casing.

[0007] The above-mentioned casing is generally an integral structure. In order to withstand the heat radiation caused by fuel combustion and contain the turbine rotor disk fragments, the casing is usually made of high-temperature alloy materials and thicker walls. The overall use of high-density high-temperature alloy materials and thicker walls will cause the casing to be heavy, causing the APU to exceed the weight standard. Therefore, a casing design is needed that can meet the requirements of heat radiation caused by fuel combustion and contain turbine rotor disk fragments, while meeting the requirements of not exceeding the gravity standard. Summary of the invention

[0008] In view of the above problems, the present invention provides a split casing and an auxiliary power device, comprising a first casing and a second casing connected to each other; the first casing and the second casing are made of different materials;

[0009] The first casing comprises a first casing barrel, one end of the first casing barrel is provided with a first connecting end, and the first connecting end is provided with a sealing groove;

[0010] The second casing comprises a second casing barrel, and an end of the second casing barrel close to the first casing is provided with a second connecting end, and the second connecting end is buckled with the first connecting end;

[0011] A rubber ring is installed in the sealing groove, and the rubber ring is in sealing contact with the sealing groove and the second connecting end; and clamps are installed on the outer sides of the first connecting end and the second connecting end.

[0012] Furthermore, the contact surface between the first connection end and the second connection end is an inclined surface, and the inclination angle forms an acute angle with the air flow direction.

[0013] Furthermore, at least one slot is provided on the first connection end, and at least one stop boss is provided on the second connection end. The number of the slots is the same as that of the stop bosses, and they correspond one to one.

[0014] Furthermore, the first connecting end is in an inverted "F" shape.

[0015] Furthermore, the second connecting end is in a "7" shape.

[0016] Furthermore, the second connecting end, the second casing barrel and the mounting edge are connected in sequence by welding.

[0017] Furthermore, the first casing is made of cast aluminum alloy in one piece.

[0018] Furthermore, the second casing is made of high-temperature alloy material.

[0019] An auxiliary power device comprises the above-mentioned split casing; an axial diffuser, a flame tube and a turbine rotor assembly are installed inside the split casing.

[0020] Furthermore, the axial diffuser is installed inside the first casing barrel, and the flame tube and the turbine rotor assembly are installed inside the second casing barrel.

[0021] Beneficial effects:

[0022] 1. The present invention realizes the connection between the first casing and the second casing by providing a first casing and a second casing connected to each other, and installing a clamp on the outer side of the first connecting end of the first casing and the second connecting end of the second casing, thereby realizing the integrity of the casing. By making the first casing and the second casing of different materials, the technical problem of heavy weight of the casing due to the use of high-density high-temperature alloy materials and thick wall thickness is solved, while meeting the requirements of heat radiation caused by fuel combustion and containing turbine rotor wheel fragments.

[0023] 2. The present invention can effectively prevent casing gas leakage by designing the contact surface between the first connecting end and the second connecting end as an inclined surface, thereby improving the sealing effect of the first casing and the second casing.

[0024] 3. The present invention provides at least one slot on the first connection end and at least one stop boss on the second connection end, wherein the slots are the same in number and correspond to the stop bosses one by one, so as to achieve circumferential positioning and effectively prevent the first casing and the second casing from rotating relative to each other during operation.

[0025] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A front view schematic diagram of a split casing in Embodiment 1 of the present invention is shown.

[0028] Figure 2 Shows Figure 2 Schematic diagram of the local enlarged structure.

[0029] Figure 3 A three-dimensional view and a partial enlarged view of the first casing in Embodiment 1 of the present invention are shown.

[0030] Figure 4 A stereoscopic view and a partially enlarged view of the second casing in Embodiment 1 of the present invention are shown.

[0031] Figure 5 A schematic diagram of the auxiliary power unit in Embodiment 2 of the present invention is shown.

[0032] In the figure, 1, first casing; 11, first casing barrel; 12, first connecting end; 13, slot; 14, sealing slot;

[0033] 2. Clamp; 3. Rubber ring;

[0034] 4. second casing; 41. second connecting end; 42. stop boss; 43. second casing barrel; 44. mounting edge;

[0035] 5. Axial diffuser; 6. Flame tube; 7. Turbine rotor assembly. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] Example 1

[0040] like Figure 1 As shown, Figure 1 FIG. 1 is a front view schematic diagram of a split casing in Embodiment 1 of the present invention. Figure 1 , a split casing, comprising a first casing 1 and a second casing 4 connected to each other; when working, the first casing 1 and the second casing 4 are connected by a clamp 2. To prevent air leakage, a rubber ring 3 is placed between the first casing 1 and the second casing 4. (Refer to Figure 3 ) The first casing 1 comprises a first casing barrel 11, one end of the first casing barrel 11 is provided with a first connecting end 12, and the first connecting end 12 is provided with a sealing groove 14; (reference Figure 4 ) The second casing 4 includes a second casing barrel 43, and a second connecting end 41 is provided at one end of the second casing barrel 43 close to the first casing 1, and the second connecting end 41 is buckled with the first connecting end 12; the contact surface between the first connecting end 12 of the first casing 1 and the second connecting end 41 of the second casing 4 is an inclined surface, and at the same time, a card slot 13 is provided for installing the rubber ring 3, which can effectively prevent gas leakage in the split casing.

[0041] Specifically, a rubber ring 3 is installed in the sealing groove 14, and the rubber ring 3 is in sealing contact with the sealing groove 14 and the second connecting end 41; a clamp 2 is installed outside the first connecting end 12 and the second connecting end 41. The clamp 2 can be a standard quick-release clamp as required; the rubber ring 3 can be a standard high-temperature resistant rubber ring as required.

[0042] like Figure 2 As shown, Figure 2 Shows Figure 2 A partial enlarged structural diagram of the Figure 2 The contact surface between the first connection end 12 and the second connection end 41 is an inclined surface, and the inclination angle forms an acute angle with the air flow direction, and the angle is 30°-75°. Specifically, the contact surface between the first connection end 12 and the second connection end 41 is an inclined surface, which can effectively prevent the casing gas leakage;

[0043] In the implementation of the present invention, at least one slot 13 is provided on the first connection end 12, and at least one stop boss 42 is provided on the second connection end 41. The number of the slots 13 and the stop boss 42 is the same, and they correspond one to one. Specifically, the first connection end 12 of the first casing 1 is designed with two 10mmx5mmx5mm slots 13, which are used to cooperate with the stop boss 42 of the second casing 4 to achieve circumferential positioning, which can effectively prevent the first casing 1 and the second casing 4 from rotating relative to each other during operation; the second connection end 41 of the second casing 4 is designed with two 10mmx5mmx5mm stop bosses, which are used to cooperate with the slots 13 of the first connection end 12 of the first casing 1 to achieve circumferential positioning, which can effectively prevent the first casing 1 and the second casing 4 from rotating relative to each other during operation.

[0044] In the above embodiment, another optional implementation is that three equidistant 10mmx5mmx5mm slots 13 are designed on the first connecting end 12 of the first casing 1, which are used to cooperate with the stop boss 42 of the second casing 4 to achieve circumferential positioning, which can effectively prevent the first casing 1 and the second casing 4 from rotating relative to each other during operation; three equidistant 10mmx5mmx5mm stop bosses 42 are designed on the second connecting end 41 of the second casing 4, which are used to cooperate with the slots 13 of the first connecting end 12 of the first casing 1 to achieve circumferential positioning, which can effectively prevent the first casing 1 and the second casing 4 from rotating relative to each other during operation.

[0045] In the above embodiment, another optional implementation is that four equidistant 10mmx5mmx5mm slots 13 are designed on the first connecting end 12 of the first casing 1, which are used to cooperate with the stop boss 42 of the second casing 4 to achieve circumferential positioning, which can effectively prevent the first casing 1 and the second casing 4 from rotating relative to each other during operation; four equidistant 10mmx5mmx5mm stop bosses 42 are designed on the second connecting end 41 of the second casing 4, which are used to cooperate with the slots 13 of the first connecting end 12 of the first casing 1 to achieve circumferential positioning, which can effectively prevent the first casing 1 and the second casing 4 from rotating relative to each other during operation.

[0046] Furthermore, the first connection end 12 is in an inverted "F" shape. The second connection end 41 is in a "7" shape. Specifically, the inverted "F"-shaped first connection end 12 cooperates with the "7"-shaped second connection end 41, thereby achieving the buckling of the two. At the same time, the inverted "F"-shaped first connection end 12 is provided with a sealing groove 14, and the rubber ring 3 is installed in the sealing groove 14, thereby achieving the sealed connection between the first connection end 12 and the second connection end 41, and improving the sealing effect.

[0047] In the above embodiment, another optional implementation is that the second connection end 41, the second casing barrel 43 and the mounting edge 44 are connected by welding in sequence. The wall thickness of the second casing barrel 43 is 1.0-3.0 mm; preferably, the wall thickness of the second casing barrel 43 is 2.0 mm; the mounting edge 44 has 24 φ5.5 bolt holes evenly distributed, which are used to connect with other APU components;

[0048] In a specific embodiment, the first casing 1 is made of cast aluminum alloy. The material of the first casing 1 is cast aluminum alloy, and the cylinder wall thickness is 1.0-2.0mm. Preferably, the cylinder wall thickness is 1.5mm. The front end is a flange with a plurality of holes. The front flange of the first casing 1 has 24 evenly distributed φ5.5 bolt holes for connecting with other APU components; the rear end is a first connecting end 12, which is used to connect with the mounting edge 44 of the second casing 4 through a clamp 2. Cast aluminum alloys are widely used in various engine parts and accessory parts with an operating temperature below 250°C. In addition, cast aluminum alloys have the advantage of lower density. Taking ZL105 as an example, its density is 2680kg / m 3 , so the front casing material can be cast aluminum alloy;

[0049] Specific embodiments are as follows. The second casing 4 is made of superalloy material. The material of the second casing 4 is selected as superalloy, including a second connection end 41, a second casing cylinder 43, and a mounting flange 44. The three are connected by welding. The second connection end 41 is connected to the front casing 1 through a clamp 2. The rear end of the mounting flange 44 is a flange with several holes. Superalloy materials have excellent high-temperature resistance and relatively high strength. Therefore, the rear casing assembly can use superalloy materials. However, the density of superalloy is relatively high. Taking GH4169 as an example, its density is 8240 kg / m 3 .

[0050] During installation, the rubber ring 3 needs to be installed in the sealing groove 14 of the first casing cylinder 11, and the depth of the sealing groove 14 is set to be less than the diameter of the rubber ring 3, so that the rubber ring 3 can be in close contact with the sealing groove 14 and the second connection end 41, thereby completing the sealing. At the same time, the first connection end 12 is set in an inverted "F" shape, and the second connection end 41 is designed in a "7" shape, so that the first connection end 12 and the second connection end 41 are buckled to form a trapezoid, which is convenient for the subsequent installation of the clamp 2. The second connection end 41 is installed on the first connection end 12. The protruding section on the right side of the second connection end 41, that is, the horizontal section of the "7" character, is installed in the groove of the second connection end 41 (that is, in the mouth of the inverted "F") to form a "ji" character shape.

[0051] Embodiment 2

[0052] As Figure 5 shown, Figure 5 Fig. shows a schematic diagram of the auxiliary power unit in Embodiment 2 of the present invention. Referring to Figure 5 , an auxiliary power unit includes a split casing as in Embodiment 1. An axial diffuser 5, a combustion chamber 6, and a turbine rotor assembly 7 are installed inside the split casing. Specifically, the axial diffuser 5 is installed inside the front casing 1; the combustion chamber 6 and the turbine rotor assembly 7 are installed inside the second casing 4; as Figure 5 shown, during operation, other components of the APU are connected to the front casing 1 and the second casing 4 through bolts.

[0053] In the implementation of the present invention, the axial diffuser 5 is installed inside the first casing cylinder 11, and the combustion chamber 6 and the turbine rotor assembly 7 are installed inside the second casing cylinder 43.

[0054] As Figure 5As shown, the arrows in the figure indicate the direction of air flow from the upper left to the lower right, and then become the direction of gas flow after passing through the flame tube 6. During operation, the air flows through the axial diffuser 5 into the front casing 1. At this time, because the airflow has not yet been mixed with the fuel for combustion, the temperature is relatively low and usually does not exceed 200°C. At the same time, the axial diffuser 5 is a non-rotating part, so the heat resistance and containment requirements of the front casing are relatively low. The air flow coming out of the axial diffuser 5 enters the flame tube 6 through the combustion holes on the flame tube, mixes with the fuel and burns. At this time, the second casing 4 needs to withstand high temperature and high pressure airflow. At the same time, impacted by the high temperature airflow, the turbine rotor assembly 7 begins to rotate at high speed, and the rotation speed is generally about 50,000 r / min, so the rear casing assembly has the requirements of withstanding the heat radiation caused by fuel combustion and containing turbine rotor wheel fragments.

[0055] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present invention and features of different embodiments or examples without contradiction.

[0056] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A split casing, characterized in that: It comprises a first casing (1) and a second casing (4) connected to each other; the first casing (1) and the second casing (4) are made of different materials; The first casing (1) comprises a first casing barrel (11), one end of the first casing barrel (11) is provided with a first connecting end (12), and the first connecting end (12) is provided with a sealing groove (14); The second casing (4) comprises a second casing barrel (43), and a second connecting end (41) is provided at one end of the second casing barrel (43) close to the first casing (1), and the second connecting end (41) is buckled with the first connecting end (12); A rubber ring (3) is installed in the sealing groove (14), and the rubber ring (3) is in sealing contact with the sealing groove (14) and the second connecting end (41); and clamps (2) are installed outside the first connecting end (12) and the second connecting end (41).

2. A split casing according to claim 1, characterized in that: The contact surface between the first connection end (12) and the second connection end (41) is an inclined surface, and the inclination angle forms an acute angle with the air flow direction.

3. A split casing according to claim 1, characterized in that: At least one clamping groove (13) is provided on the first connection end (12), and at least one stop boss (42) is provided on the second connection end (41); the number of the clamping grooves (13) and the number of the stop bosses (42) are the same and correspond one to one.

4. A split casing according to any one of claims 1 to 3, characterized in that: The first connecting end (12) is in an inverted "F" shape.

5. A split casing according to any one of claims 1 to 3, characterized in that: The second connecting end (41) is in a "7" shape.

6. A split casing according to claim 5, characterized in that: The second connecting end (41), the second casing barrel (43) and the mounting edge (44) are connected in sequence by welding.

7. A split casing according to claim 1, characterized in that: The first casing (1) is made in one piece from cast aluminum alloy.

8. A split casing according to claim 1, characterized in that: The second casing (4) is made of high-temperature alloy material.

9. An auxiliary power unit, characterized in that: It comprises a split casing as claimed in any one of claims 1 to 8; an axial diffuser (5), a flame tube (6) and a turbine rotor assembly (7) are installed on the inner side of the split casing.

10. An auxiliary power unit according to claim 9, characterized in that: The axial diffuser (5) is installed on the inner side of the first casing barrel (11), and the flame tube (6) and the turbine rotor assembly (7) are installed on the inner side of the second casing barrel (43).

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