A gas charging and discharging device for a stratospheric float

Abstract

The application provides a gas charging and discharging device for a stratosphere float, which comprises a fan assembly and a valve assembly. The fan assembly comprises a housing coaxially arranged; the housing comprises a fan shell and a motor shell coaxially arranged, and a first airflow channel is formed between the fan shell and the motor shell. The valve assembly comprises a valve body, a valve rod and a valve cover; the valve body is connected with the housing, and the valve body is provided with an air inlet channel penetrating through the valve body and communicating with the first airflow channel; the valve rod penetrates through the valve body in the axial direction and partially extends into the motor shell, and the valve rod is movably connected with the valve body in the axial direction. The embodiment of the application does not need to be provided with a current collector and a fairing, and airflow can directly enter the first airflow channel in the housing through the air inlet channel of the valve body, so that the overall structure of the gas charging and discharging device is more simplified. Moreover, since the valve rod penetrates through the valve body in the axial direction and partially extends into the motor shell, the integration and miniaturization of the gas charging and discharging device are facilitated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aerostats, and more particularly relates to a gas charging and discharging device for a stratospheric aerostat. BACKGROUND

[0002] A modern stratospheric airship is a kind of aerostat that can stay in the stratosphere at an altitude of about 20 kilometers above the ground for a long time. The use of helium gas bags and air bags to adjust the altitude is a unique control feature of airships and balloons and other types of floating aircraft. For an aerostat, the helium gas bag is used to fill the lifting gas to provide buoyancy, and the air bag is used to fill air to maintain the pressure shape. Further, by adjusting the volume of the air bag, the buoyancy of the aerostat can be changed, and thus the hovering altitude can be changed. Using a fan to compress external air into the air bag can lower the hovering altitude, and using an exhaust valve to exhaust air from the air bag can raise the hovering altitude. By adjusting the hovering altitude, different wind layers at different altitudes can be used to adjust the flight trajectory to achieve specific trajectory control objectives and complete specific flight tasks.

[0003] The gas charging and discharging device for a stratospheric aerostat in the related art includes a fan, a valve and other components. The related gas charging and discharging device uses multiple fans to improve the air charging capacity, and a valve is installed at the outlet of each fan to control the air flow of the fan. The related gas charging and discharging device has many components and a complex structure, which increases the weight of the aerostat and is not conducive to the integration and miniaturization of the gas charging and discharging device. SUMMARY

[0004] Therefore, the present application provides a gas charging and discharging device for a stratospheric aerostat to solve the technical problem of how to simplify the structure of the gas charging and discharging device to improve its integration and miniaturization.

[0005] The technical solution of the present application is as follows:

[0006] The embodiment of the present application provides a kind of for stratosphere aerostat's inflation and deflation device, comprising: fan assembly, including coaxial arrangement shell and impeller assembly;Wherein, the impeller assembly is located in the axial end of the shell, the shell includes coaxial arrangement fan housing and motor housing, the fan housing is located in the motor housing outer side, the fan housing and the motor housing between the first air flow passage that is formed with impeller assembly communication, the motor housing is provided for driving the first motor of the impeller assembly rotation;Valve assembly, is arranged in the axial other end of the shell, the valve assembly includes: valve body, the valve body is connected with the shell, the valve body is opened and is communicated with the first air flow passage and passes through the valve body and enters the air passage;Valve stem, along axial direction and partially extends into the motor housing and passes through the valve body, the valve stem is movably connected with the valve body;Valve cover, fixedly connected in the valve stem end away from the shell;Wherein, the valve stem drives the valve cover to move between the first position close to the valve body to close air inlet channel and the second position away from the valve body to open air inlet channel.

[0007] In some embodiments, the valve body includes a center body and a ring body surrounding the outside of the center body, the air inlet channel is located between the ring body and the center body, the air inlet channel is provided with a connecting rib connecting the ring body and the center body;Wherein, the center body is in abutment with the motor housing, the ring body is fixedly connected with the fan housing, the valve stem is movably connected with the center body and the valve stem is spaced from the first motor.

[0008] In some embodiments, the center body is further provided with a second motor, the second motor is drivingly connected with the valve stem to drive the valve stem to move, and the second motor is at least partially located in the motor housing.

[0009] In some embodiments, the valve assembly further comprises: a gasket, which is attached to the end of the valve body close to the valve cover and located outside the air inlet channel, the valve cover is attached to the gasket in the first position, and the valve cover is separated from the gasket in the second position.

[0010] In some embodiments, the impeller assembly comprises: an impeller connected with the first motor to rotate around the axial direction driven by the first motor, the impeller has a second air flow passage communicated with the first air flow passage;Diffuser, the diffuser includes inner edge component and outer edge component coaxial with the impeller, the outer edge component is arranged outside the impeller and fixedly connected with the shell, the inner edge component is in abutment with the impeller, the inner edge component and the outer edge component form an air outlet channel communicated with the second air flow passage, and the cross-sectional area of the air outlet channel perpendicular to the axial direction increases away from the impeller.

[0011] In some embodiments, the impeller comprises: a wheel disc arranged at one end of the first motor away from the valve assembly and connected with an output shaft of the first motor, the wheel disc having a first end and a second end opposite in axial direction, the cross-sectional area of the wheel disc perpendicular to the axial direction gradually increasing from the first end to the second end; a plurality of blades arranged at the outer surface of the wheel disc in a circumferential direction, each blade extending from near the first end to the second end of the wheel disc, the second airflow passage being formed between adjacent blades; wherein the inner edge component of the diffuser is arranged at the second end of the wheel disc and smoothly connected with the wheel disc and extends outward.

[0012] In some embodiments, the minimum gap between the outer edge component of the diffuser and the outer edge of the blade is 0.15-0.25mm.

[0013] In some embodiments, the cross-sectional width of the outlet passage in the axial direction is constant, and / or the cross-sectional width of the second airflow passage in the axial direction is constant, and / or the extension direction of each blade along the second airflow passage is arranged with equal thickness.

[0014] In some embodiments, the impeller assembly further comprises: a protective cover arranged at one end of the diffuser away from the impeller in the axial direction, the protective cover covering the space surrounded by the inner edge component of the diffuser, and the protective cover being fixed with the inner edge component.

[0015] In some embodiments, the gas charging and discharging device further comprises a fixing assembly, the fixing assembly comprising: a flange disc arranged inside the float and fixedly connected with the shell arranged outside the float; a mounting plate arranged outside the float and fixedly connected with the flange disc and the diffuser; wherein the diffuser is arranged inside the float.

[0016] The embodiment of the present application provides a kind of for stratosphere aerostat's inflation and deflation device, including fan assembly and valve assembly.Fan assembly includes the housing of coaxial arrangement;The housing includes the fan housing and motor housing of coaxial arrangement, and first airflow passage is formed between fan housing and motor housing.Valve assembly includes valve body, valve stem and valve cover, valve body is connected with the housing, and the air inlet channel that valve body is opened and passes through valve body and is communicated with first airflow passage;Valve stem is axially through valve body and partially extends into motor housing, and valve stem is movably connected with valve body in axial direction.Valve body is connected with the housing in the embodiment of the present application, and the air inlet channel that valve body is opened and passes through valve body and is communicated with first airflow passage, so that airflow can directly pass through the air inlet channel of valve body and enter first airflow passage in the housing, without setting flow collector for collecting airflow and adjusting airflow direction fairing, so that the overall structure of inflation and deflation device is more simplified.And since valve stem is axially through valve body and partially extends into motor housing, so valve stem does not protrude too much to the housing, and valve stem is movably connected with valve body in axial direction, and valve stem can drive valve cover to close air inlet channel or and away from valve body to open air inlet channel, so that when valve stem completely closes air inlet channel, most of valve stem extends into motor housing, which is conducive to realizing the integration and miniaturization of the overall structure of inflation and deflation device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the perspective structural schematic diagram of the inflation and deflation device (valve assembly is in the first position) of the embodiment of the present application;

[0018] Figure 2 It is the perspective structural schematic diagram of the inflation and deflation device (valve assembly is in the second position) of the embodiment of the present application;

[0019] Figure 3 It is the perspective structural schematic diagram of the inflation and deflation device of the embodiment of the present application; Figure 1 The sectional view of A-A direction shown;

[0020] Figure 4 The sectional view of B-B direction shown of the inflation and deflation device of the embodiment of the present application; Figure 2

[0021] Figure 5 It is the perspective structural schematic diagram of the valve assembly of the embodiment of the present application;

[0022] Figure 6 It is the sectional view of the valve assembly (valve assembly is in the first position and the second position simultaneously) of the embodiment of the present application;

[0023] Figure 7 It is the perspective structural schematic diagram of the fan housing and motor housing of the embodiment of the present application;

[0024] Figure 8 ​A cross-sectional view of the impeller assembly of an embodiment of the present application;

[0025] Figure 9 A perspective view of an impeller of an embodiment of the present application;

[0026] Figure 10 A perspective view of an impeller of an embodiment of the present application;

[0027] Figure 11 A cross-sectional view of the fixing assembly of an embodiment of the present application;

[0028] Figure 12 A perspective view of the diffuser of an embodiment of the present application.

[0029] Explanation of reference signs:

[0030] 100, air charging and discharging device; 10, fan assembly; 1, housing; 11, fan shell; 12, motor shell; 13, first air flow passage; 14, first motor; 141, output shaft; 142, wire column; 15, connecting piece; 2, impeller assembly; 21, impeller; 211, wheel disc; 2111, first end; 2112, second end; 212, blade; 22, second air flow passage; 23, diffuser; 231, inner edge component; 232, outer edge component; 233, air outlet passage; 234, support column; 24, protective cover; 3, valve assembly; 31, valve body; 311, air inlet passage; 312, center body; 313, annular body; 314, connecting rib; 315, second motor; 32, valve rod; 33, valve cover; 34, sealing gasket; 4, fixing assembly; 41, flange plate; 42, mounting plate; 43, pressing ring. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0032] In the specific embodiments, each specific technical feature described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the present application are not described again.

[0033] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0034] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0035] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a gas inflation / deflation device 100 for a stratospheric airship, including a fan assembly 10 and a valve assembly 3. The airship includes a capsule, and the gas inflation / deflation device 100 is used to inflate the capsule. The fan assembly 10 includes a housing 1 and an impeller assembly 2 arranged coaxially, meaning the centers of the housing 1 and the impeller assembly 2 are along the same axis. It can be understood that both the housing 1 and the impeller assembly 2 can be considered axisymmetric structures, but absolute axisymmetry is not required. The axis is as follows... Figure 1 and Figure 2 As shown in the diagram, impeller assembly 2 is located at one end of housing 1 along the axial direction, which is the direction of extension of axis L. Figure 3 and Figure 4 As shown, the housing 1 includes a fan housing 11 and a motor housing 12 arranged coaxially. One end of the fan housing 11 is fixedly connected to the impeller assembly 2. The fan housing 11 is located outside the motor housing 12. The fan housing 11 and the motor housing 12 are fixedly connected. A first airflow channel 13 communicating with the impeller assembly 2 is formed between the fan housing 11 and the motor housing 12. Both ends of the fan housing 11 and the motor housing 12 are open. One end of the fan housing 11 and the motor housing 12 is open and communicates with the impeller assembly 2. The airflow flowing into the first airflow channel 13 can flow into the impeller assembly 2. It can be understood that a channel for airflow is formed inside the impeller assembly 2. The first airflow channel 13 communicates with the channel inside the impeller assembly 2.

[0036] like Figure 3 and Figure 4As shown, the motor housing 12 is provided with a first motor 14 for driving the impeller assembly 2 to rotate, and the first airflow passage 13 is located outside the motor housing 12. When the airflow passes through the first airflow passage 13, the heat generated by the operation of the first motor 14 can be effectively taken away to cool the first motor 14. The stator part inside the first motor 14 is fixed to the motor housing 12 by hot mounting, and the front and rear covers of the first motor 14 are connected to the motor housing 12 by bolts and other fasteners. The bearings and wave springs of the first motor 14 are located inside the front and rear covers of the first motor 14 for connecting the rotor part of the first motor 14. The space of the rear cover of the first motor 14 is used to install the driver and other electronic devices of the first motor 14. The housing 1 is also provided with a wire column 142 penetrating the motor housing 12 and the fan housing 11. The wire column 142 is hollow, and the control and power supply cables connected to the motor pass through the internal cavity of the wire column 142 to the outside.

[0037] As shown in Figure 3 and Figure 4 , the valve assembly 3 is arranged at the other end of the housing 1 in the axial direction, and the valve assembly 3 and the impeller assembly 2 are respectively connected to the housing 1 at opposite ends of the housing 1 in the axial direction. The valve assembly 3 includes a valve body 31, a valve rod 32, and a valve cover 33. The valve body 31 is connected to the housing 1, for example, a bolt hole is formed in the valve body 31, and the valve body 31 is fixedly connected to the fan housing 11 by bolts and other fasteners. The valve body 31 is provided with an air inlet passage 311 penetrating the valve body 31 and communicating with the first airflow passage 13, for example, the air inlet passage 311 can extend along the axial direction L; the valve rod 32 penetrates the valve body 31 in the axial direction and partially extends into the motor housing 12, and the valve rod 32 is connected to the valve body 31 and can move relative to the valve body 31 in the axial direction L; the valve cover 33 is fixedly connected to the end of the valve rod 32 away from the housing 1; wherein, Figure 3 , the valve assembly 3 is in the first position, and the valve cover 33 abuts against the valve body 31 to close the air inlet passage 311, Figure 4 , the valve assembly 3 is in the second position, and the valve cover 33 is away from the valve body 31 to open the air inlet passage 311.

[0038] The valve body in the embodiment of the present application is connected with the shell, and an air inlet channel is formed in the valve body and communicates with the first air flow channel, so that the air flow can directly enter the first air flow channel in the shell through the air inlet channel of the valve body, and the air flow entering the air inlet channel needs to pass through the flow collector to flow into the first air flow channel formed between the fan shell and the motor shell. Since the air inlet channel communicates with the first air flow channel, and the first air flow channel is arranged between the fan shell and the motor shell, the cross-sectional area of the first air flow channel perpendicular to the axial direction is small, so the flow collecting efficiency is high, and it is not necessary to arrange a fairing to increase the flow collecting efficiency, so that the overall structure of the gas charging and discharging device is simplified. In addition, since the valve rod penetrates the valve body in the axial direction and partially extends into the motor shell, the valve rod does not protrude too much outside the shell, and the valve rod and the valve body are movably connected in the axial direction. The valve rod can drive the valve cover to close the air inlet channel or to open the air inlet channel, so that when the valve rod completely closes the air inlet channel, most of the valve rod extends into the motor shell, and the overall structure of the gas charging and discharging device is integrated and miniaturized.

[0039] In some embodiments, as shown in Figure 5 The valve body 31 includes a center body 312 and an annular body 313 surrounding the outside of the center body 312, and the air inlet channel 311 is located between the annular body 313 and the center body 312. The connecting rib 314 connecting the annular body 313 and the center body 312 is arranged in the air inlet channel 311, and the air inlet channel 311 is divided into multiple parts by the connecting rib 314. As shown in Figure 3 and Figure 4 The center body 312 abuts against the motor shell 12, and the annular body 313 is fixedly connected with the fan shell 11. Specifically, a bolt hole is formed in the annular body 313, and the annular body 313 is fixedly connected with the fan shell 11 by a fastener such as a bolt. The valve rod 32 penetrates the center body 312 and is movably connected with the center body 312. As shown in Figure 3 and Figure 4 The valve rod 32 and the first motor 14 are arranged in the axial direction and are spaced apart, and the first motor 14 and the valve body 31 have a spacing space for the valve rod 32 to move relative to the center body 312 between the first position and the second position. The embodiment of the present application further limits the structure of the valve body. The air inlet channel is formed between the annular body and the center body, the center body abuts against the motor shell, the annular body is fixedly connected with the fan shell, and the first air flow channel is formed between the motor shell and the fan shell, so that the air flow entering the air inlet channel can directly enter the first air flow channel.

[0040] In some embodiments, as shown in Figure 6As shown, the center body 312 is also provided with a second motor 315, which is located on the opposite side of the valve body 31 relative to the valve cover 33. The second motor 315 is provided with a gear set and bearings inside, and is in transmission connection with the valve rod 32. The second motor 315 drives the gear set to drive the valve rod 32 to move relative to the valve body 31. The second motor 315 is at least partially located in the motor housing 12. It can be understood that the second motor 315 can be partially located in the motor housing 12, or entirely located in the motor housing 12. The embodiment of the present application further limits that the second motor is at least partially located in the motor housing, further utilizing the space in the fan assembly to improve the integration of the air charging and discharging device.

[0041] In some embodiments, as shown in Figure 5 and Figure 6 As shown, the connecting ribs 314 can be provided in four, which are evenly distributed between the annular body 313 and the center body 312. The inlet air passage 311 is divided into four parts by the dividing ribs, which can effectively increase the stability of the inlet airflow. Preferably, the connecting ribs 314 can be evenly arranged between the annular body 313 and the center body 312. As shown in Figure 7 The fan housing 11 and the motor housing 12 are fixedly connected by the connecting piece 15. The connecting piece 15 can be a dividing rib. The dividing rib can be provided in four, which are evenly distributed between the fan housing 11 and the motor housing 12. The first airflow passage 13 is divided into four parts by the dividing ribs. The connecting ribs 314 and the connecting pieces 15 are uniformly distributed in the circumferential direction. Each connecting rib 314 is correspondingly provided with a connecting piece 15 in the axial direction, so that the airflow in the inlet air passage can directly flow into the corresponding first airflow passage.

[0042] In some embodiments, as shown in Figure 6 The valve assembly 3 further includes a sealing gasket 34 made of foamed silicone rubber, which has good low-temperature performance and is not prone to brittle. The sealing gasket 34 is attached to one end of the valve body 31 close to the valve cover 33 and located outside the inlet air passage 311. Specifically, the sealing gasket 34 is attached to one end of the annular body 313 close to the valve cover 33, and the sealing gasket 34 is distributed around the annular body 313. The valve cover 33 is attached to the sealing gasket 34 at the first position, and the valve cover 33 is separated from the sealing gasket 34 at the second position. The embodiment of the present application limits that the sealing gasket is attached to one end of the valve body close to the valve cover and located outside the inlet air passage, so that the valve cover is attached to the sealing gasket at the first position to seal the inlet air passage, and the valve cover is separated from the sealing gasket at the second position to open the inlet air passage.

[0043] In some embodiments, as shown in Figure 8 The impeller assembly 2 includes an impeller 21 and a diffuser 23. As shown in Figure 3 and Figure 4As shown, the impeller 21 is connected with the first motor 14, the first motor 14 can drive the impeller 21 to rotate around the axis, the impeller 21 has a second airflow channel 22 which is communicated with the first airflow channel 13. The diffuser 23 includes an inner rim part 231 and an outer rim part 232 which are coaxial with the impeller 21, the outer rim part 232 is arranged outside the impeller 21, and the outer rim part 232 is equivalent to the wheel cover of the impeller 21. The outer rim part 232 is fixedly connected with the shell 1, and specifically, a bottom of the outer rim part 232 is provided with a circle of bolt holes which are fixedly connected with the fan shell 11 by bolts or other fasteners. The inner rim part 231 abuts against the impeller 21, and the inner rim part 231 and the outer rim part 232 form an air outlet channel 233 which is communicated with the second airflow channel 22, and the airflow can enter the second airflow channel 22 from the first airflow channel 13, and then enter the capsule of the airship from the air outlet channel 233, the capsule of the airship includes a helium capsule and an air capsule, and the air outlet channel 233 is generally used for inflating the air capsule of the airship.

[0044] As shown in the drawings, Figure 8 The outer rim part 232 and the inner rim part 231 are provided with a plurality of support columns 234 to support the inner rim part 231, and the cross-sectional area of the air outlet channel 233 perpendicular to the axis increases with the distance from the impeller 21, and as the diameter of the air outlet channel 233 increases, the flow area of the airflow increases, the flow velocity decreases, the pressure increases, and the airflow tends to uniform flow, thereby realizing the conversion of dynamic pressure to static pressure on the air outlet side of the impeller 21. In some embodiments, the air outlet channel 233 is supported by the plurality of uniformly distributed support columns 234, which is conducive to the stable connection of the outer rim part 232 and the inner rim part 231 under balanced force, and the inner rim part is not easy to tilt on one side under the influence of airflow impact, thereby affecting the smooth flow of the airflow through the air inlet channel.

[0045] The outer rim part in the embodiment of the present application is arranged outside the impeller and fixedly connected with the shell, the outer rim part functions as the wheel cover of the impeller, and together with the impeller forms the second airflow channel which is communicated with the first airflow channel, and the bottom of the outer rim part is fixedly connected with the shell to ensure that the airflow of the first airflow channel can smoothly flow into the second airflow channel. The inner rim part and the outer rim part form the air outlet channel which is communicated with the second airflow channel, and the cross-sectional area of the air outlet channel perpendicular to the axis increases with the distance from the impeller, thereby the flow velocity of the airflow decreases, the pressure increases, and the airflow tends to uniform flow, thereby realizing the conversion of dynamic pressure to static pressure on the air outlet side of the impeller. The diffuser simultaneously has the functions of connection, wheel cover and diffuser, not only the overall structure tends to be simplified, but also the diversification of the diffuser function is realized.

[0046] In some embodiments, as shown in the drawings, Figure 9 The impeller 21 includes a wheel disc 211 and a plurality of blades 212. As shown in the drawings, Figure 3 and Figure 4As shown, the wheel disc 211 is arranged at the end of the first motor 14 away from the valve assembly 3, the wheel disc 211 is connected with the output shaft 141 of the first motor 14, the output shaft 141 drives the wheel disc 211 to rotate around the axis. The wheel disc 211 has a first end 2111 and a second end 2112 opposite in the axial direction, the airflow enters the second airflow passage 22 from the first end 2111 (the air inlet side), and flows out of the second airflow passage 22 from the second end 2112 (the air outlet side) of the impeller 21.

[0047] As shown in Figure 9 and Figure 10 , a plurality of blades 212 are arranged on the outer surface of the wheel disc 211 in a circumferential direction, the blades 212 can be three-dimensional twisted blades 212, here, the three-dimensional twisted blades 212 refer to the shape of the blades 212 changes in the xyz three directions, in this way, the blades 212 can better adapt to the flow of the airflow. In some embodiments, the blades 212 can obtain three-dimensional twisted blades with smaller resistance through fluid mechanics-based simulation software, and the twist angles of the plurality of blades 212 are the same. In some embodiments, the number of blades 212 can be 20. In some embodiments, the inlet twist angle of the blades 212 is 37.4 degrees to 29.5 degrees, and the outlet twist angle is 49 degrees to 52 degrees. The design of the twist angle is beneficial to the smooth flow of the airflow from the air inlet side to the air outlet side under the action of centrifugal force and axial force.

[0048] It should be noted that, referring to Figure 8 and Figure 9 , the impeller 21 can be integrally machined and formed by high-strength 7075 aviation aluminum, and the surface of the impeller 21 has a protective film through a special surface treatment process, which can prevent damage to the blades 212 due to accidents, and at the same time improve the salt spray corrosion resistance of the impeller 21. In some embodiments, the impeller 21 is designed for weight reduction for high-altitude environment requirements, for example, the weight of the impeller 21 can be 0.23 kg, the inlet diameter Bh of the wheel disc 211 is 84 mm, the outlet width b2 is 10 mm, it should be noted that the outlet width b2 is the vertical straight line distance between the inner edge part 231 and the outer edge part 232 of the diffuser 23, and the outlet diameter d2 of the impeller 21 is 140 mm. The rated speed of the impeller 21 is designed to be 25000-30000 rpm, the power required for the high-altitude 20 km working condition is about 400w, and at the design working point, the flow rate can be provided 1200 m3 / h and the pressure head can be provided 1200 pa, and the overall efficiency can reach 82%.

[0049] As shown in Figure 9As shown, each blade 212 extends from near the first end 2111 to the second end 2112 of the disk 211, and a second airflow channel 22 is formed between adjacent blades 212. Since the cross-sectional area of ​​the disk 21 in the vertical axis gradually increases from the first end 2111 to the second end 2112, the flow area of ​​the airflow in the second airflow channel 22 increases.

[0050] like Figure 8 As shown, the airflow direction entering the second airflow channel 22 from the first end 2111 (inlet side) of the impeller 21 is parallel to the axial direction of the impeller 21. The airflow direction exiting the second airflow channel 22 from the second end 2112 (outlet side) of the impeller 21 forms an acute angle with the axial direction of the impeller 21. This causes the airflow direction in the second airflow channel 22 to deflect as it passes through the impeller 21, changing from the axial direction of the impeller 21 to a direction with a certain acute angle to its axial direction. That is, it is equivalent to the principle of a mixed-flow fan. The impeller 21 makes the airflow undergo both centrifugal and axial motion, which increases the pressure head, flow rate, and response time, thereby improving the height adjustment capability of the airship. Specifically, the airflow direction exiting the second airflow channel 22 from the impeller 21 is the first direction, the axial direction of the impeller 21 is the second direction, and the angle between the first direction and the second direction is α. For example, after assembly, the angle α can be equal to 60 degrees.

[0051] The principle of mixed-flow fans: such as Figure 8 and Figure 9 As shown, multiple blades 212 are circumferentially spaced on the outer surface of the disk 211. Each blade 212 extends from near the first end 2111 to the second end 2112 of the disk 211, forming a second airflow channel 22 between adjacent blades 212. As the cross-sectional area of ​​the disk 21 gradually increases along its vertical axis, the area of ​​the second airflow channel 22 gradually increases from the first end 2111 to the second end 2112. The area of ​​the second airflow channel 22 refers to its cross-sectional area, which is the area of ​​the second airflow channel 22 on a section perpendicular to its extension direction (i.e., the axial direction). As the area of ​​the second airflow channel 22 increases and the flow velocity decreases, the corresponding airflow pressure increases. Through the setting of the impeller and diffuser, the airflow flowing axially from the first end 2111 is accelerated by the rotation of the impeller and flows radially outward by the action of centrifugal force. During the radial outflow process, the airflow decelerates and increases in pressure, so that the pressure of the airflow flowing radially out of the second airflow channel 22 at the second end 2112 is significantly higher than the pressure of the airflow flowing axially in. This achieves the function of pressurizing the centrifugal fan, making the fan more suitable for the low air density and low atmospheric pressure environment in the stratosphere.

[0052] like Figure 8As shown, the inner edge part 231 of the diffuser 23 is arranged at the second end 2112 of the wheel disc 211 and is smoothly connected with the wheel disc 211 and extends outward. It needs to be supplemented that the inner edge part 231 is arranged in the extending direction of the wheel disc 211, and a gap is arranged between the inner edge part 231 and the wheel disc 211, and the inner edge part 231 is not fixed with the wheel disc 211, at this time, when the wheel disc 211 rotates around the axis direction of the impeller 21, the inner edge part 231 does not rotate with the wheel disc 211.

[0053] In some embodiments, as shown in Figure 8 As shown, the width of the channel between the outer edge part 232 and the wheel disc 211 gradually decreases from the air inlet side to the air outlet side, and the airflow speed increases during the process of flowing through the channel due to the gradually decreasing width of the channel, so that the gas is quickly compressed.

[0054] The embodiment of the present application limits the structure of the impeller, the cross-sectional area of the wheel disc perpendicular to the axis direction gradually increases, and a plurality of blades are arranged on the outer surface of the wheel disc in a circumferential direction, and through the arrangement of the impeller and the diffuser, the axially flowing gas is first accelerated by the rotation of the impeller, and flows radially outward by the action of the centrifugal force, and the gas is decelerated and pressurized during the radial outflow process, so that the pressure of the gas flowing out of the diffuser at the second end in the radial direction is greatly improved relative to the pressure of the axially flowing gas, which plays a role of pressurization of the centrifugal fan, and makes the fan more suitable for the use environment of low air density and low atmospheric pressure in the stratosphere.

[0055] In some embodiments, as shown in Figure 8 As shown, the tip clearance is formed between the outer edge part 232 of the diffuser 23 and the top of the blade 212, and the tip clearance is b as shown Figure 8 After assembly, the tip clearance is 0.15-0.25mm. The tip clearance is an important factor affecting the efficiency of the impeller 21, and the appropriate tip clearance is related to the efficiency of the impeller 21 and the safe operation of the impeller 21. If the tip clearance is too large, the efficiency of the impeller 21 will be greatly reduced, and if the tip clearance is too small, the impeller 21 will collide and wear the blade 212, and in severe cases, the entire impeller 21 will be stuck, and the centrifugal force will cause the tip clearance of the blade 212 to decrease, and the material shrinkage caused by low temperature will cause the tip clearance to increase. In some embodiments, the appropriate tip clearance of the impeller 21 can be obtained by using a fluid mechanics simulation software, and in some embodiments, the generatrix constituting the inner wall surface of the outer edge part 232 can be obtained by fluid mechanics calculation optimization. The embodiment of the present application limits the tip clearance formed between the outer edge part and the top of the blade to 0.15-0.25mm, which can ensure the efficiency of the blade and the operation under various working conditions.

[0056] In some embodiments, as shown in Figure 8As shown, the width of the cross section of the outlet passage 233 perpendicular to the axial direction is constant, that is, the distance between the inner edge component 231 and the outer edge component 232 forming the outlet passage 233 is equal, and / or, as shown, Figure 9 As shown, the width of the cross section of the second airflow passage 22 perpendicular to the axial direction is constant, and it can be understood that all the blades 212 are distributed equidistantly on the wheel disc 211, the width of the second airflow passage 22 formed between adjacent blades 212 is the same, and / or, as shown, Figure 9 As shown, in order to balance the strength characteristics and aerodynamic characteristics of the impeller 21 at high speed, each blade 212 is of equal thickness along the extension direction of the second airflow passage 22, and the thickness of the entire blade 212 can be 1 mm. The embodiment of the present application limits the width of the cross section of the outlet passage perpendicular to the axial direction to be constant, and / or, the width of the cross section of the second airflow passage perpendicular to the axial direction to be constant, and / or, each blade is of equal thickness along the extension direction of the second airflow passage, which is beneficial to the more uniform flow of the airflow in the airflow passage and reduces the impact of the airflow flow on the passage wall.

[0057] In some embodiments, as shown, Figure 8 As shown, the impeller assembly 2 further comprises a protective cover 24, which is arranged at the end of the diffuser 23 away from the impeller 21 in the axial direction, and the protective cover 24 is fixedly connected with the inner edge component 231, so that it is located at the top of the gas charging and discharging device and inside the capsule of the airship. The protective cover 24 covers the space surrounded by the inner edge component 231 of the diffuser 23, the surface of the protective cover 24 is smooth without edges and corners, and the protective cover 24 is made of low-temperature-resistant transparent polypropylene material. The embodiment of the present application covers the space surrounded by the inner edge component of the diffuser by arranging the protective cover, so that the capsule of the airship can be prevented from contacting the rotating impeller before being formed, thereby playing a protective role. In the ground test stage, the rotation of the impeller can be observed through the protective cover, and the protective cover has the characteristics of light weight and beautiful appearance.

[0058] In some embodiments, as shown, Figure 3 , Figure 4 and Figure 11As shown, the gas charging and discharging device 100 further comprises a fixing assembly 4. The fixing assembly 4 comprises a flange plate 41 arranged inside the airship and fixedly connected with the shell 1 arranged outside the airship. Specifically, the flange plate 41 is provided with two circles of bolt holes, the pressing ring 43 is provided with one circle of bolt holes, the outer circle of bolt holes is fixedly connected with the pressing ring 43, the pressing ring 43 is arranged adjacent to the mounting plate 42 in the direction perpendicular to the axial direction, the pressing ring 43 is located outside the mounting plate 42, and the inner circle of bolt holes of the flange plate 41 is connected with the mounting plate 42. The mounting plate 42 is arranged outside the airship and fixedly connected with the flange plate 41 and the diffuser 23. Specifically, the mounting plate 42 is in the shape of a circular ring, the mounting plate 42 is provided with two circles of bolt holes, the inner circle is connected with the bolt holes at the bottom of the diffuser 23, and the outer circle is connected with the inner circle of bolt holes of the flange plate 41, so as to realize the fixing of the diffuser and the flange plate. The diffuser 23 is arranged inside the airship. As shown in Figure 12 As shown, Figure 12 The specific structure of the diffuser is shown. The diffuser 23 is provided with double-row bolt holes at the bottom. The inner circle is provided with a plurality of uniformly distributed bolt holes for connecting the motor shell 12. The outer circle of bolt holes is arranged at an angle of 15 degrees with the inner circle of bolt holes and is fixedly connected with the inner circle of bolt holes of the mounting plate 42. The inside and outside of the airship are shown in Figure 3 and Figure 4 As shown.

[0059] When the gas charging and discharging device 100 is integrated and installed with the airship, a circular hole is first formed on the airship body, the flange plate 41 is arranged inside the airship film, then the pressing ring 43 is arranged outside the airship film, then a fastener such as a screw is used to pass through the airship film and be screwed with the flange plate 41 to form a pressing, so that the outer circle of bolt holes of the flange plate 19 cooperates with the pressing ring 43 to clamp the airship film material in the middle.

[0060] In the embodiment of the present application, the gas charging and discharging device is fixedly connected with the airship body through the fixing assembly, the airship film material is clamped in the middle by the cooperation of the flange plate and the pressing ring, and the sealing is formed by the bolt pre-tightening force, which is beneficial to the flow of air flow in the air flow channel and the smooth flow out of the air outlet.

[0061] The above is only a preferred embodiment of the present application and is not used to limit the protection scope of the present application.

Claims

1. A gas charging and discharging device for a stratospheric float, characterized in that, The application relates to a fan assembly and a valve assembly. The fan assembly comprises a housing and an impeller assembly arranged coaxially; the impeller assembly is arranged at one end of the housing in the axial direction; the housing comprises a fan shell and a motor shell arranged coaxially; the fan shell is arranged outside the motor shell; a first airflow channel is formed between the fan shell and the motor shell and communicates with the impeller assembly; a first motor is arranged in the motor shell and drives the impeller assembly to rotate. The valve assembly is arranged at the other end of the housing in the axial direction; the valve assembly comprises: a valve body connected with the housing; an air inlet channel is formed in the valve body and communicates with the first airflow channel; a valve rod arranged in the valve body in the axial direction and partially arranged in the motor shell; the valve rod is movably connected with the valve body in the axial direction; a valve cover fixedly connected with the valve rod and away from the housing; the valve rod drives the valve cover to move between a first position close to the valve body to close the air inlet channel and a second position away from the valve body to open the air inlet channel.

2. The inflation and deflation device according to claim 1, characterized in that The valve body comprises a central body and a ring body arranged outside the central body; the air inlet channel is arranged between the ring body and the central body; a connecting rib is arranged in the air inlet channel and connects the ring body and the central body; the central body abuts against the motor shell; the ring body is fixedly connected with the fan shell; the valve rod is movably connected with the central body; and the valve rod is spaced apart from the first motor.

3. The inflation and deflation device of claim 2, wherein, The central body is further provided with a second motor; the second motor is drivingly connected with the valve rod to drive the valve rod to move; and the second motor is at least partially arranged in the motor shell.

4. The inflation and deflation device of claim 2, wherein, The valve assembly further comprises: a sealing gasket arranged outside the air inlet channel and close to the valve cover of the valve body; the valve cover is in contact with the sealing gasket at the first position; and the valve cover is separated from the sealing gasket at the second position.

5. A device according to any one of claims 1-4, characterised in that The impeller assembly comprises: an impeller connected with the first motor to rotate around the axial direction driven by the first motor; the impeller has a second airflow channel communicating with the first airflow channel; a diffuser; the diffuser comprises an inner edge component and an outer edge component arranged coaxially with the impeller; the outer edge component is arranged outside the impeller and fixedly connected with the housing; the inner edge component abuts against the impeller; an air outlet channel is formed between the inner edge component and the outer edge component and communicates with the second airflow channel; and the cross-sectional area of the air outlet channel perpendicular to the axial direction gradually increases away from the impeller.

6. The inflation and deflation device of claim 5, wherein, The impeller comprises: a disc arranged at one end of the first motor away from the valve assembly and connected with the output shaft of the first motor; the disc has a first end and a second end opposite to each other in the axial direction; the cross-sectional area of the disc perpendicular to the axial direction gradually increases from the first end to the second end; a plurality of blades arranged at the outer surface of the disc in the circumferential direction; each blade extends from the first end to the second end of the disc; and the second airflow channel is formed between adjacent blades. The inner edge part of the diffuser is arranged at the second end of the wheel disc and is smoothly connected with the wheel disc and extends outward.

7. The inflation and deflation device of claim 6, wherein, The minimum gap between the outer edge part of the diffuser and the outer edge of the blade is 0.15-0.25mm.

8. The inflation and deflation device of claim 6, wherein, The width of the cross section of the gas outlet channel in the vertical axial direction is a constant value, and / or the width of the cross section of the second gas flow channel in the vertical axial direction is a constant value, and / or each of the blades is arranged with equal thickness along the extension direction of the second gas flow channel.

9. The inflation and deflation device of claim 5, wherein, The impeller assembly further comprises: A protective cover is arranged at the end of the diffuser away from the impeller in the axial direction, the protective cover covers the space surrounded by the inner edge part of the diffuser, and the protective cover is fixed with the inner edge part.

10. A device according to any one of claims 1 to 4, wherein The gas charging and discharging device further comprises a fixing assembly, the fixing assembly comprises: A flange plate is arranged inside the float and is fixedly connected with the shell arranged outside the float; An installation plate is arranged outside the float and is fixedly connected with the flange plate and the diffuser, wherein the diffuser is arranged inside the float.

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