Centrifugal ventilator with oil return groove and centrifugal ventilation system

Abstract

The invention provides a centrifugal ventilator with oil return grooves and a centrifugal ventilation system.The centrifugal ventilator comprises a fan shaft and a plurality of plunger pipes, the fan shaft is provided with a plurality of vent holes, at least one oil return groove is formed around each vent hole, and the oil return grooves penetrate through the inner surface of the fan shaft; the oil return grooves are communicated with the inner surfaces of the corresponding vent holes; each plunger pipe comprises a ventilation pipe part and a connection part, and the plunger pipes are installed in the corresponding ventilation holes. At least one vertical oil return groove is formed in the side face of the ventilation pipe part. At least one horizontal oil return groove is formed in the upper surface of the connecting part and is correspondingly communicated with an oil return groove in the fan shaft. And the separation of the lubricating oil from the oil-gas mixture is better promoted, and the separation efficiency of the centrifugal ventilator is improved.

Description

Technical Field

[0001] The invention relates to the technical field of bearing cavity ventilation and oil return, and in particular to a centrifugal ventilator with an oil return groove and a centrifugal ventilation system. Background Art

[0002] The power of aircraft engine transmission mainly comes from the gas working on the turbine. The hot air from the combustion chamber rotates the main shaft and drives other accessories. These mechanical transmissions require a lubrication system to ensure their reliability.

[0003] During the transmission process, the main bearing sealing system of the aircraft engine needs to be sealed by air with a certain pressure. Some of the air involved in the sealing will enter the bearing cavity, where the air and lubricating oil are mixed to form an oil-gas mixture. If the oil and gas are directly discharged from the bearing cavity, a large amount of lubricating oil will be lost. The reserve amount of aircraft engine lubricating oil is certain, and a large amount of lubricating oil consumption will inevitably affect the mechanical performance of the engine, thereby affecting other main performances of the engine.

[0004] Therefore, a ventilator is set on the ventilation path between the bearing cavity and the outside world to separate the lubricating oil in the air to reduce the lubricating oil consumption. Typical ventilators include centrifugal ventilators, impeller ventilators and axial ventilators.

[0005] As an important part of the lubricating oil system, the main function of the centrifugal ventilator of an aircraft engine is to separate the lubricating oil mixed in the oil-gas mixture, maintain the pressure difference between the inside and outside of the lubricating oil cavity, separate the oil droplets in the oil-gas mixture, and increase the utilization rate of the lubricating oil. Therefore, the performance of the centrifugal ventilator is directly related to the working performance of the mechanical transmission of the aircraft engine.

[0006] The centrifugal ventilator separates the lubricating oil mixed in the oil-gas mixture, and this ability directly determines the important indicator of the entire engine lubricating oil consumption. Excessive lubricating oil consumption will greatly affect the design of the entire lubricating oil system, forcing the lubricating oil tank to increase and the power of the lubricating oil pump to increase further, which will greatly increase the cost and budget of the engine lubricating oil system design. Therefore, the performance of the centrifugal ventilator has a crucial impact on the design of the entire lubricating oil system, and a smaller lubricating oil consumption can also meet the engine's longer cruising time, which is also very helpful for the operation of the engine.

[0007] The axial ventilator is a relatively mature structure of centrifugal ventilator for aircraft engines. It is installed on the low-pressure shaft of the engine. This type of centrifugal ventilator has been widely used in many models and has a relatively mature structure. However, during the actual whole machine test, it was found that obvious white mist would appear at the center tail of the engine. The ability of the centrifugal ventilator to separate lubricating oil has room for improvement.

[0008] In view of this, the inventor of the present application has designed a centrifugal ventilator and a centrifugal ventilation system with an oil return groove in order to overcome the above technical problems. Summary of the invention

[0009] The technical problem to be solved by the present invention is to overcome the defect of insufficient ability of separating lubricating oil of the centrifugal ventilator in the prior art, and to provide a centrifugal ventilator and a centrifugal ventilation system with an oil return groove.

[0010] The present invention solves the above technical problems through the following technical solutions:

[0011] The present invention provides a centrifugal ventilator with an oil return groove, which is characterized in that it includes a fan shaft and a plurality of plunger tubes, wherein a plurality of vents are arranged on the fan shaft, and at least one oil return groove is arranged around each of the vents, the oil return groove passes through the inner surface of the fan shaft, and the oil return groove is connected to the inner surface of the corresponding vent; each of the plunger tubes includes a ventilation pipe portion and a connecting portion, and the plunger tube is installed in the corresponding vent; at least one vertical oil return groove is arranged on the side of the ventilation pipe portion; and at least one horizontal oil return groove is arranged on the upper surface of the connecting portion, and the horizontal oil return groove is connected to the oil return groove on the fan shaft accordingly.

[0012] According to one embodiment of the present invention, a plurality of the oil return grooves are arranged around each of the air holes; there are a plurality of horizontal oil return grooves on each of the plunger tubes, and the number and arrangement positions of the horizontal oil return grooves match those of the oil return grooves on the fan shaft.

[0013] According to one embodiment of the present invention, each of the air vents is provided with three oil return grooves on both sides of the axial direction of the fan shaft; and three horizontal oil return grooves are provided on both sides of the upper surface of the connecting portion on each of the plunger tubes, and the setting positions of the horizontal oil return grooves match the oil return grooves on the fan shaft.

[0014] According to one embodiment of the present invention, each of the air vents is provided with three oil return grooves on one side of the axial direction of the fan shaft; and three horizontal oil return grooves are provided on one side of the upper surface of the connecting portion on each of the plunger tubes, and the setting positions of the horizontal oil return grooves match the oil return grooves on the fan shaft.

[0015] According to one embodiment of the present invention, the edge of the oil return groove on the fan shaft has a chamfered edge.

[0016] According to one embodiment of the present invention, a fixing hole is arranged around each of the vent holes, and a connecting hole is arranged on the connecting portion of each of the plunger tubes. The connecting holes correspond to the fixing holes, and the fan shaft and the plunger tube are fixed to each other through a connecting piece.

[0017] According to an embodiment of the present invention, the connecting hole is a screw hole with internal threads; and the connecting member is a fixing screw.

[0018] According to one embodiment of the present invention, each of the air vents is provided with a fixing hole on both sides of the circumferential direction of the fan shaft, and two connecting holes are provided on the connecting portion of each of the plunger tubes, and the positions of the fixing holes and the connecting holes match each other.

[0019] According to one embodiment of the present invention, the edge of the vent hole has a chamfered edge, and the top edge of the ventilation tube portion of the plunger tube has a chamfered angle.

[0020] The present invention also provides a centrifugal ventilation system, which is characterized in that the centrifugal ventilation system includes a bearing cavity, an oil return port and any centrifugal ventilator with an oil return groove as described above, the oil return port is arranged outside the bearing cavity, and the centrifugal ventilator is arranged inside the bearing cavity.

[0021] The positive and progressive effects of the present invention are:

[0022] The centrifugal ventilator with oil return groove of the present invention has at least the following advantages:

[0023] 1. Breaking through the traditional structure of centrifugal ventilators for aircraft engines, a new form of centrifugal ventilator structure is proposed, which opens up new ideas for the design of the entire lubricating oil system of aircraft engines.

[0024] 2. An oil return groove is opened on the rotating shaft of the centrifugal ventilator to better promote the separation of lubricating oil from the oil-gas mixture and improve the separation efficiency of the centrifugal ventilator.

[0025] 3. A plurality of fixing holes are provided on the fan shaft of the centrifugal ventilator, and the plunger tube and the fan shaft of the centrifugal ventilator are fixed to each other by tightening nuts, thereby improving reliability.

[0026] Fourth, the centrifugal ventilator has a simple structure, is easy to process, and has an easy-to-implement structure.

[0027] 5. It can further improve the performance of the centrifugal ventilator on the original basis, increase the oil return capacity, reduce the lubricating oil consumption, and at the same time does not affect the ventilation function of the centrifugal ventilator. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0029] Figure 1 This is a schematic diagram of the working principle of a centrifugal ventilator.

[0030] Figure 2A It is a partial enlarged view of the fan shaft in the prior art.

[0031] Figure 2B It is a partial enlarged view of the plunger tube in the prior art.

[0032] Figure 3 It is a first partial schematic diagram of a fan shaft of a centrifugal ventilator with an oil return groove according to the present invention.

[0033] Figure 4A It is a first stereoscopic schematic diagram of a fan shaft of a centrifugal ventilator structure in the prior art.

[0034] Figure 4B It is a second stereoscopic schematic diagram of a fan shaft of a centrifugal ventilator structure in the prior art.

[0035] Figure 4C The present invention is a schematic diagram of the assembly state of the plunger tube of the centrifugal ventilator structure in the prior art.

[0036] Figure 4D It is a stereoscopic schematic diagram of a plunger tube of a centrifugal ventilator structure in the prior art.

[0037] Figure 4E It is a schematic diagram of the vent holes on the fan shaft of the centrifugal ventilator structure in the prior art.

[0038] Figure 5A It is a three-dimensional schematic diagram of a fan shaft of a centrifugal ventilator with an oil return groove according to the present invention.

[0039] Figure 5B The present invention is a schematic diagram of the ventilation holes, oil return grooves and fixing holes on the fan shaft of the centrifugal ventilator with oil return grooves.

[0040] Figure 5C The utility model is a cross-sectional installation schematic diagram of the plunger tube and the fan shaft of the centrifugal ventilator with oil return groove of the present invention.

[0041] Figure 5D The present invention is a three-dimensional schematic diagram of a plunger tube of a centrifugal ventilator with an oil return groove.

[0042] Figure 5E The invention discloses a three-dimensional installation diagram of a plunger pipe and a fan shaft of a centrifugal ventilator with an oil return groove.

[0043] Fig. 6A The present invention is a schematic diagram of the size and position of the plunger pipe connecting hole of the centrifugal ventilator with an oil return groove.

[0044] Figure 6B The present invention is a schematic diagram of the arrangement of the plunger pipe connecting hole of the centrifugal ventilator with the oil return groove.

[0045] Fig. 7A It is a second partial schematic diagram of the fan shaft of the centrifugal ventilator with oil return groove of the present invention.

[0046] Figure 7B It is a partial cross-sectional schematic diagram of a fan shaft of a centrifugal ventilator with an oil return groove according to the present invention.

[0047] Figure 7C The present invention is a schematic top view of a plunger tube of a centrifugal ventilator with an oil return groove.

[0048] Fig.7D The present invention is a schematic diagram of the arrangement of the fixing holes and the oil return groove of the centrifugal ventilator with the oil return groove.

[0049] Fig. 8A It is a first cross-sectional schematic diagram of the positional relationship between the oil return groove and the horizontal oil return groove of the centrifugal ventilator with the oil return groove of the present invention.

[0050] Figure 8B It is a second cross-sectional schematic diagram of the positional relationship between the oil return groove and the horizontal oil return groove of the centrifugal ventilator with the oil return groove of the present invention.

[0051] Fig.9A It is another arrangement form of the horizontal oil return groove of the plunger tube of the centrifugal ventilator with the oil return groove of the present invention.

[0052] Fig. 9B This is another arrangement form of the fan shaft oil return groove of the centrifugal ventilator with the oil return groove of the present invention.

[0053] Fig. 10A The invention is a schematic diagram of a centrifugal ventilator with an oil return groove, in which the oil return groove on the fan shaft is not connected to the inner surface of the vent hole.

[0054] Fig. 10B The invention is a schematic diagram of the oil return groove on the fan shaft of the centrifugal ventilator with the oil return groove and the inner surface of the vent hole being connected.

[0055] Fig. 10C The invention is a schematic diagram of a centrifugal ventilator with an oil return groove and a chamfered edge arranged on the oil return groove on the fan shaft.

[0056] Fig.11A The present invention is a schematic diagram of the arrangement of the fan shaft fixing hole of the centrifugal ventilator with the oil return groove.

[0057] Fig. 11B The present invention is a schematic diagram of the arrangement of threads on the surface of the fixing screws of the centrifugal ventilator with an oil return groove.

[0058] Fig. 12A The present invention is a schematic diagram of the positional relationship between the fixing screws and the plunger tube of the centrifugal ventilator with an oil return groove.

[0059] Fig. 12B The diagram is an enlarged schematic diagram of the positional relationship between the fixing screws and the plunger tube of the centrifugal ventilator with an oil return groove of the present invention.

[0060] Fig.13A It is a schematic diagram of the diameter of the fixing screws of the centrifugal ventilator with the oil return groove of the present invention.

[0061] Fig. 13B The present invention is a schematic diagram of the screw hole diameter of the plunger tube of the centrifugal ventilator with the oil return groove.

[0062] Fig. 13C It is a schematic diagram of the diameter of the fixing hole of the fan shaft of the centrifugal ventilator with the oil return groove of the present invention.

[0063] Fig.14A The present invention is a schematic diagram of the position relationship of multiple plunger tubes in a centrifugal ventilator structure in the prior art.

[0064] Fig. 14B The figure is a schematic diagram of the position relationship of multiple plunger pipes of the centrifugal ventilator with oil return groove of the present invention.

[0065] Fig.15A It is a schematic diagram showing that the top edge of the ventilation pipe portion of the plunger tube of the centrifugal ventilator with the oil return groove of the present invention is not chamfered.

[0066] Fig. 15B It is a schematic diagram of a centrifugal ventilator with an oil return groove according to the present invention in which the edge of the vent hole of the fan shaft is not provided with a chamfer.

[0067] [Reference Signs]

[0068] Fan shaft 100

[0069] Ventilation hole 110

[0070] Chamfer 111

[0071] Oil return tank 120

[0072] Fixing hole 130

[0073] Plunger tube 200

[0074] Ventilation pipe 210

[0075] Vertical oil return tank 211

[0076] Chamfer 212

[0077] Connecting part 220

[0078] Horizontal oil return tank 221

[0079] Connection hole 222

[0080] Bearing cavity 300

[0081] Oil return port 400

[0082] Connector 500

[0083] Fixing screw surface 510

[0084] Fixing screw lower end face 520 DETAILED DESCRIPTION

[0085] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0086] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0087] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the present invention specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this document.

[0088] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

[0089] The centrifugal ventilator is a component used to separate lubricating oil from the oil-air mixture and is installed in the bearing cavity 300. Figure 1 As shown, the centrifugal ventilator in the prior art is mainly composed of two components, one component is a fan shaft 100, and the other component is a plurality of plunger tubes 200 installed on the fan shaft 100. The entire centrifugal ventilator is installed in a bearing cavity 300. When the engine is running, the centrifugal ventilator will rotate at a high speed, with a maximum speed of about 3500rpm and a minimum speed of about 800rpm.

[0090] When the centrifugal ventilator rotates at high speed, it will generate a large centrifugal force to separate the lubricating oil in the incoming oil-air mixture A, and the remaining air B will be discharged, while the separated lubricating oil will be discharged from the oil return port 400.

[0091] like Figure 2A and Figure 2BAs shown, it is a partial enlarged view of the fan shaft 100 and the plunger tube 200 in the prior art. In the prior art, the plunger tube 200 is installed on the fan shaft 100. The fan shaft 100 plays the role of fixing the plunger tube 200 and rotating to generate centrifugal force, and all the plunger tubes 200 installed on the fan shaft 100 play the role of ventilation and oil return. The oil-gas mixture enters from the inlet C of each plunger tube 200. Due to the effect of centrifugal force, the lubricating oil first passes through the horizontal oil return groove 221 on the plunger tube 200, and then enters the vertical oil return groove 211 to be separated, and finally discharged from the oil return port 400. After entering the plunger tube 200, the air is discharged along the flow direction. This is the role of oil-gas separation played by the centrifugal ventilator.

[0092] The present invention improves and optimizes the structure of the centrifugal ventilator from the perspective of improving the performance of the centrifugal ventilator and reducing the lubricating oil consumption of the entire engine. An oil return groove 120 and a mounting hole are opened on the rotating shaft of the centrifugal ventilator to ensure that more lubricating oil can be separated, thereby increasing the continuous operation time of the aircraft engine.

[0093] like Figure 3 , Figure 5A to Figure 5E , Figure 7A to Figure 7D , Fig. 8A and Figure 8B As shown, the present invention provides a centrifugal ventilator with an oil return groove, comprising a fan shaft 100 and a plurality of plunger tubes 200 .

[0094] A plurality of vents 110 are disposed on the fan shaft 100 . At least one oil return groove 120 is disposed around each vent 110 . The oil return groove 120 penetrates the inner surface of the fan shaft 100 , and the oil return groove 120 is connected to the inner surface of the corresponding vent 110 .

[0095] Each plunger tube 200 includes a ventilation tube portion 210 and a connecting portion 220, and the plunger tube 200 is installed in the corresponding vent hole 110. At least one vertical oil return groove 211 is provided on the side of the ventilation tube portion 210; at least one horizontal oil return groove 221 is provided on the upper surface of the connecting portion 220, and the horizontal oil return groove 221 is correspondingly connected to the oil return groove 120 on the fan shaft 100.

[0096] like Figure 7B and Fig.7D As shown, the oil return groove 120 penetrates the inner surface H of the fan shaft 100 .

[0097] like Fig. 10B As shown, the oil return groove 120 needs to be connected to the inner surface I of the corresponding vent hole 110, and no Fig. 10A If the Fig. 10AIn the above situation, the separated lubricating oil cannot be discharged through the vertical oil return groove 211 in the plunger tube 200, and the lubricating oil cannot be better separated.

[0098] like Fig. 8A and Figure 8B , shows the positional relationship between the oil return groove 120 of the fan shaft 100 and the horizontal oil return groove 221 of the plunger tube 200 of the present invention. The oil return groove 120 on the fan shaft 100 and the horizontal oil return groove 221 on the plunger tube 200 need to be connected vertically. That is, the arrangement of the two should be as consistent as possible.

[0099] The number of the oil return grooves 120 on the fan shaft 100 needs to match the number of the horizontal oil return grooves 221 on the plunger tube 200 .

[0100] Providing an oil return groove 120 on the rotating shaft of the centrifugal ventilator can better promote the separation of lubricating oil from the oil-air mixture, thereby improving the separation efficiency of the centrifugal ventilator.

[0101] like Figure 3 , Figure 5A to Figure 5E , Figure 7A to Figure 7D As shown, as a preferred embodiment of the centrifugal ventilator with oil return grooves of the present invention, a plurality of oil return grooves 120 are arranged around each vent hole 110. There are a plurality of horizontal oil return grooves 221 on each plunger tube 200, and the number and arrangement positions of the horizontal oil return grooves 221 match the oil return grooves 120 on the fan shaft 100.

[0102] The provision of multiple oil return grooves 120 and multiple horizontal oil return grooves 221 enables the centrifugal ventilator to have a stronger ability to separate lubricating oil and a higher separation efficiency, thereby achieving the goal of reducing lubricating oil consumption.

[0103] like Figure 3 , Figure 5A to Figure 5E , Figure 7A to Figure 7D As shown in the figure, as a preferred embodiment of the centrifugal ventilator with oil return grooves of the present invention, each vent hole 110 is provided with three oil return grooves 120 on both sides of the axial direction of the fan shaft 100. Three horizontal oil return grooves 221 are provided on both sides of the upper surface of the connecting portion 220 on each plunger tube 200, and the setting position of the horizontal oil return grooves 221 matches the oil return grooves 120 on the fan shaft 100.

[0104] The oil return groove 120 and the horizontal oil return groove 221 are arranged in the above manner, so that the centrifugal ventilator has a stronger ability to separate lubricating oil and a higher separation efficiency, thereby achieving the goal of reducing lubricating oil consumption.

[0105] like Fig.9A and Fig. 9BAs shown in the figure, as a preferred embodiment of the centrifugal ventilator with oil return grooves of the present invention, each vent hole 110 is provided with three oil return grooves 120 on one side of the axial direction of the fan shaft 100. Three horizontal oil return grooves 221 are provided on one side of the upper surface of the connecting portion 220 on each plunger tube 200, and the setting position of the horizontal oil return grooves 221 matches the oil return grooves 120 on the fan shaft 100.

[0106] Since the arrangement of the plunger tube 200 and the oil return groove 120 needs to be as consistent as possible, Fig.9A The horizontal oil return groove 221 of the middle plunger tube 200 is in the form of a single-sided horizontal oil return groove 221. Fig. 9B As shown, the form of the oil return groove 120 on the fan shaft 100 should also be adjusted accordingly to be consistent with the form of the oil return groove 120 on the plunger tube 200.

[0107] like Fig. 10C As shown, as a preferred embodiment of the centrifugal ventilator with oil return groove of the present invention, the edge of the oil return groove 120 on the fan shaft 100 has a chamfer 111.

[0108] For processing needs, a chamfer 111 may be formed on the oil return groove 120 .

[0109] like Figure 3 , Figure 5A to Figure 5E As shown, as a preferred embodiment of the centrifugal ventilator with an oil return groove of the present invention, a fixing hole 130 is arranged around each vent hole 110, and a connecting hole 222 is arranged on the connecting portion 220 of each plunger tube 200, the connecting hole 222 corresponds to the fixing hole 130, and the fan shaft 100 and the plunger tube 200 are fixed to each other by a connecting member 500.

[0110] like Figure 7B and Fig.7D As shown, the fixing hole 130 needs to penetrate the inner surface H of the fan shaft 100 .

[0111] The number of the fixing holes 130 on the fan shaft 100 must match the number of the connecting holes 222 on the plunger tube 200 and the number of the connecting members 500 .

[0112] Figure 4A to Figure 4E The figure shows the assembly and fixing method of the centrifugal ventilator structure in the prior art. In the centrifugal ventilator structure in the prior art, the fan shaft 100 and the plunger tube 200 are fixed mainly by interference fit between the chamfer 212 on the plunger tube 200 structure and the chamfer 111 of the vent hole 110 on the fan shaft 100, and the plunger tubes 200 are closely attached to each other and self-fixed to each other.

[0113] like Fig.14A and Fig. 14B , showing the installation method of the plunger tube 200. Fig.14A This is a self-fixing method for each plunger tube 200 in a centrifugal fan structure in the prior art. Because of the limitation of the assembly and fixation between the plunger tube 200 and the fan shaft 100 in the prior art, each plunger tube 200 needs to be self-fixed in a close manner to meet the requirements of fixed installation. However, this method has certain design requirements for the size of the distance between the left and right installation end faces of the plunger tube 200. If the size design is too large, the plunger tube 200 will not be able to be installed and fixed.

[0114] The centrifugal ventilator with oil return groove in the above preferred embodiment has a high reliability in its installation method, and it is not required that each plunger tube 200 be fixed in a self-fixing manner. Fig. 14B As shown, a certain gap is allowed between each plunger tube 200, and the existence of the gap does not have a bad effect on the fixation of the plunger tube 200. This can also leave enough margin when designing the size of the plunger tube 200, and when installing the plunger tube 200, the plunger tube 200 will not be unable to be installed.

[0115] Therefore, the centrifugal ventilator structure in the above preferred embodiment has a significant improvement in the installation and fixing method compared to the centrifugal ventilator structure in the prior art, and can improve the safety and reliability of the centrifugal ventilator.

[0116] like Figure 5D and Figure 5E As shown, as a preferred embodiment of the centrifugal ventilator with oil return groove of the present invention, the connecting hole 222 is a screw hole with internal thread, and the connecting member 500 is a fixing screw.

[0117] The number of the fixing holes 130 on the fan shaft 100 must match the number of the screw holes and the fixing screws on the plunger tube 200 .

[0118] like Fig. 6A and Figure 6B As shown, the screw hole serving as the connecting hole 222 on the plunger tube 200 of the centrifugal ventilator needs to be punched through the lower end surface D of the plunger tube 200 , and the screw hole and the inlet C of the plunger tube 200 need to maintain the same center line. Fig. 6A As shown, the diameter of the screw hole is also subject to the restrictions of the three distances E, F and G marked. The diameter cannot exceed the value of G, and a certain safety distance must be left, that is, the values ​​of E and F cannot be too small, and the minimum value of E and F must be 1mm.

[0119] like Fig.11A and Fig. 11B, shows the arrangement of threads of the fixing hole 130 of the fan shaft 100 and the fixing screw surface 510 as the connecting member 500. Since the fixing screw surface 510 plays a role of direct fixing and installation, threads are required to be set on the fixing screw surface 510, while threads may not be set on the inner surface of the fixing hole 130 of the fan shaft 100. Since threads are required to be set on the inner surface of the screw hole of the plunger tube 200, the fixing is not affected if threads are not set on the inner surface of the fixing hole 130.

[0120] like Fig. 12A and Fig. 12B , shows the positional relationship between the fixing screw as the connecting member 500 and the plunger tube 200, that is, the positional relationship between the lower end surface 520 of the fixing screw and the lower end surface D of the plunger tube 200. In order to achieve a better fixing and installation effect, the lower end surface 520 of the fixing screw and the lower end surface D of the plunger tube 200 need to at least maintain a flush relationship. Of course, if the length of the fixing screw is lengthened so that the lower end surface 520 of the fixing screw can exceed the lower end surface D of the plunger tube 200, the installation and fixing effect will be better.

[0121] like Figures 13A to 13C , a schematic diagram showing the corresponding diameter d1 of the fixing screw, the corresponding diameter d2 of the screw hole of the plunger tube 200, and the corresponding diameter d3 of the fixing hole 130 of the fan shaft 100. According to the requirements of assembly and installation, the nominal values ​​of the three diameters should be kept consistent, the nominal value tolerance of the corresponding diameter d1 of the fixing screw can adopt the lower tolerance, and the nominal value tolerance of the corresponding diameter d2 of the screw hole of the plunger tube 200 and the corresponding diameter d3 of the fixing hole 130 of the fan shaft 100 can adopt the upper tolerance.

[0122] like Fig.15A and Fig. 15B As shown, in the centrifugal ventilator with oil return groove of the above embodiment, the chamfer 111 on the edge of the vent hole 110 on the fan shaft 100 and the chamfer 212 on the top edge of the ventilation pipe part 210 of the plunger tube 200 may not be provided. Because the screw fixing installation method is adopted, its reliability is higher than the traditional fixing method between the plunger tube 200 and the fan shaft 100, and the installation and fixing is more firm.

[0123] When the aircraft engine test is completed and needs to be disassembled, all the fixing screws need to be loosened and disassembled, and then all the plunger tubes 200 are taken out one by one to complete the disassembly of the centrifugal ventilator. The disassembly method and steps are not complicated and are easy to implement.

[0124] The assembly and fixing method of the plunger tube 200 of the centrifugal ventilator in the above-mentioned embodiment has made a breakthrough on the basis of the traditional method. The plunger tube 200 is provided with a screw hole and a matching fixing screw. Compared with the assembly and fixing method of the centrifugal ventilator structure in the prior art, this fixing method is more stable and the centrifugal ventilator is safer. The traditional fixing method of the centrifugal ventilator has the risk of the plunger tube 200 falling off when the engine is undergoing attitude tests or when there is large external vibration (such as a bird strike test).

[0125] Due to the fixing method of the plunger tube 200 of the centrifugal ventilator with oil return groove proposed in the present invention, the fan shaft 100 and the plunger tube 200 are connected and fixed together by fixing screws, ensuring that all plunger tubes 200 of the centrifugal ventilator will not fall off under all harsh test conditions of the aircraft engine, thereby greatly improving the stability of the centrifugal ventilator.

[0126] like Figure 3 , Figure 5A to Figure 5E , Figure 7A to Figure 7D As shown, as a preferred embodiment of the centrifugal ventilator with an oil return groove of the present invention, each vent hole 110 is provided with a fixing hole 130 on both sides of the circumferential direction of the fan shaft 100, and two connecting holes 222 are provided on the connecting portion 220 of each plunger tube 200, and the positions of the fixing holes 130 and the connecting holes 222 match each other.

[0127] Preferably, the two connecting holes 222 on the plunger tube 200 are both screw holes, and it is required that two screw holes are provided on each plunger tube 200, and the inner surfaces of the two holes are required to be provided with threads.

[0128] like Figure 5D and Figure 5E As shown, as a preferred embodiment of the centrifugal ventilator with oil return groove of the present invention, the edge of the vent hole 110 has a chamfer 111, and the top edge of the ventilation pipe part 210 of the plunger tube 200 has a chamfer 212.

[0129] The fan shaft 100 and the plunger tube 200 can be fixed by interference fit between the chamfer 212 on the plunger tube 200 and the chamfer 111 of the vent 110 on the fan shaft 100, while the plunger tubes 200 are close together and self-fixed to each other.

[0130] like Figure 10A to Figure 10C As shown in the figure, there are two additional processing points for the oil return groove 120 on the fan shaft 100 of the centrifugal ventilator with the oil return groove of the present invention: the first point is a mandatory option, the oil return groove 120 on the fan shaft 100 must be connected with the inner surface I of the vent hole 110 of the fan shaft 100, and there must be no Fig. 10A If this happens Fig. 10AIn this case, the separated lubricating oil cannot be discharged through the vertical oil return groove 211 in the plunger tube 200, and the lubricating oil cannot be better separated. The second point is an optional item. For processing needs, a chamfer 111 can be added to the oil return groove 120.

[0131] In summary, the centrifugal ventilator with oil return groove of the present invention has the following advantages:

[0132] 1. Breaking through the traditional structure of centrifugal ventilators for aircraft engines, a new form of centrifugal ventilator structure is proposed, which opens up new ideas for the design of the entire lubricating oil system of aircraft engines.

[0133] Second, an oil return groove 120 is provided on the rotating shaft of the centrifugal ventilator to better promote the separation of lubricating oil from the oil-gas mixture and improve the separation efficiency of the centrifugal ventilator.

[0134] 3. A plurality of fixing holes 130 are provided on the fan shaft 100 of the centrifugal ventilator, and the plunger tube 200 of the centrifugal ventilator and the fan shaft 100 are fixed to each other by tightening nuts, thereby improving reliability.

[0135] Fourth, the centrifugal ventilator has a simple structure, is easy to process, and has an easy-to-implement structure.

[0136] 5. It can further improve the performance of the centrifugal ventilator on the original basis, increase the oil return capacity, reduce the lubricating oil consumption, and at the same time does not affect the ventilation function of the centrifugal ventilator.

[0137] The present invention also provides a centrifugal ventilation system, including a bearing cavity 300, an oil return port 400 and the centrifugal ventilator with an oil return groove of the present invention. The oil return port 400 is arranged outside the bearing cavity 300, and the centrifugal ventilator is arranged inside the bearing cavity 300.

[0138] The centrifugal ventilation system of the present invention has the following advantages:

[0139] First, since the oil return groove 120 is provided on the rotating shaft of the centrifugal ventilator, the lubricating oil can be better separated from the oil-gas mixture, thereby improving the separation efficiency of the centrifugal ventilator, and thus the oil return effect of the centrifugal ventilation system is also better.

[0140] Second, since a plurality of fixing holes 130 are provided on the fan shaft 100 of the centrifugal ventilator, the plunger tube 200 and the fan shaft 100 of the centrifugal ventilator are fixed to each other by tightening nuts, thereby improving reliability and thus improving the overall stability of the centrifugal ventilation system.

[0141] 3. Since the performance of the centrifugal ventilator is further improved on the original basis, the oil return capacity is increased, the lubricating oil consumption is reduced, and at the same time the ventilation function of the centrifugal ventilator is not affected, the performance of the centrifugal ventilation system is better.

[0142] The invention has wide popularization and application value and can be applied to the ventilation and oil return structure design of the lubricating oil system of military and civil aviation engines, ground combustion engines or gas generators.

[0143] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A centrifugal ventilator with an oil return groove, characterized in that: Includes a fan shaft and multiple plunger tubes, A plurality of vents are arranged on the fan shaft, and at least one oil return groove is arranged around each of the vents, the oil return groove runs through the inner surface of the fan shaft, and the oil return groove is connected to the inner surface of the corresponding vent; Each of the plunger tubes comprises a ventilation tube portion and a connecting portion, and the plunger tube is installed in the corresponding vent hole; At least one vertical oil return groove is arranged on the side of the ventilation pipe part; at least one horizontal oil return groove is arranged on the upper surface of the connecting part, and the horizontal oil return groove is correspondingly connected to the oil return groove on the fan shaft.

2. The centrifugal ventilator with oil return groove according to claim 1, characterized in that: A plurality of oil return grooves are arranged around each of the vent holes; There are multiple horizontal oil return grooves on each plunger tube, and the number and setting positions of the horizontal oil return grooves match the oil return grooves on the fan shaft.

3. The centrifugal ventilator with oil return groove according to claim 2, characterized in that: Each of the vent holes is provided with three oil return grooves on both sides of the fan shaft in the axial direction; Three horizontal oil return grooves are respectively arranged on both sides of the upper surface of the connecting portion on each of the plunger tubes, and the arrangement positions of the horizontal oil return grooves match the oil return grooves on the fan shaft.

4. The centrifugal ventilator with oil return groove according to claim 2, characterized in that: Each of the vent holes is provided with three oil return grooves on one side of the axial direction of the fan shaft; Three horizontal oil return grooves are arranged on one side of the upper surface of the connecting portion on each of the plunger tubes, and the arrangement positions of the horizontal oil return grooves match the oil return grooves on the fan shaft.

5. The centrifugal ventilator with oil return groove according to claim 2, characterized in that: The edge of the oil return groove on the fan shaft has a chamfered edge.

6. The centrifugal ventilator with oil return groove according to claim 1, characterized in that: A fixing hole is arranged around each of the vent holes, and a connecting hole is arranged on the connecting portion of each of the plunger tubes. The connecting holes correspond to the fixing holes, and the fan shaft and the plunger tube are fixed to each other through a connecting piece.

7. The centrifugal ventilator with oil return groove according to claim 6, characterized in that: The connecting hole is a screw hole with internal threads; the connecting piece is a fixing screw.

8. The centrifugal ventilator with oil return groove according to claim 6, characterized in that: Each of the vent holes is provided with a fixing hole on both sides of the fan shaft in the circumferential direction. Two connecting holes are arranged on the connecting portion of each plunger tube, and the positions of the fixing hole and the connecting holes match each other.

9. The centrifugal ventilator with oil return groove according to claim 1, characterized in that: The edge of the vent hole has a chamfered edge, and the top edge of the ventilation tube portion of the plunger tube has a chamfered angle.

10. A centrifugal ventilation system, characterized in that: The centrifugal ventilation system includes a bearing cavity, an oil return port, and a centrifugal ventilator with an oil return groove as described in any one of claims 1 to 9, wherein the oil return port is arranged outside the bearing cavity, and the centrifugal ventilator is arranged inside the bearing cavity.

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