CN115949603A - An inflation and deflation device for a stratospheric aerostat - Google Patents

Abstract

The invention provides an air charging and discharging device for a stratospheric aerostat. The fan assembly comprises a shell which is coaxially arranged; the shell comprises a fan shell and a motor shell which are coaxially arranged, and a first air flow 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 shell, and the valve body is provided with an air inlet channel which penetrates through the valve body and is communicated with the first air flow channel; the valve rod penetrates through the valve body along the axial direction and partially extends into the motor shell, and the valve rod is connected with the valve body in a limited axial movement mode. According to the embodiment of the invention, a current collector and a fairing are not required to be arranged, and airflow can directly enter the first airflow channel in the shell through the air inlet channel of the valve body, so that the integral structure of the air charging and discharging device is simplified. And because the valve rod runs through the valve body along the axial direction and part stretches into the motor housing, be favorable to realizing filling the integration and the miniaturization of bleeder.

Description

A kind of inflation and deflation device for stratospheric aerostat

technical field

The invention belongs to the technical field of aerostats, and more specifically, relates to an inflation and deflation device for a stratospheric aerostat.

Background technique

The modern stratospheric airship is an aerostat that can stay in the stratosphere at a height of about 20 kilometers from the ground for a long time. The use of helium airbags and airbag structures to achieve height adjustment is a unique control feature of airships and balloons. For aerostats, the helium bladder is used to fill the buoyancy gas to provide buoyancy, and the air bladder is used to fill with air to maintain the pressure profile. Further, the buoyancy of the aerostat can be changed by adjusting the volume of the air bag, thereby changing the standing height. Using the fan to compress the outside air to the air bag can reduce the standing height; use the exhaust valve to discharge the air in the air bag to increase the standing height. By adjusting the standing height, the wind layer at different heights can be used to adjust the flight trajectory, achieve a specific trajectory control goal, and complete a specific flight task.

In the related art, the inflation and deflation devices used for stratospheric aerostats include fans, valves and other components. The related inflation and deflation devices use multiple fans to improve the ability to charge air, and valves are installed at the outlet of each fan to control The air flow of the blower and the associated inflation and deflation device have many components and complex structures, which increase the weight of the aerostat and are not conducive to the integration and miniaturization of the inflation and deflation device.

Contents of the invention

In view of this, the present invention provides an inflation and deflation device for a stratospheric aerostat to solve the technical problem of how to simplify the structure of the inflation and deflation device to improve its integration and miniaturization.

Technical scheme of the present invention is realized like this:

An embodiment of the present invention provides an inflation and deflation device for a stratospheric aerostat, comprising: a fan assembly, including a coaxial casing and an impeller assembly; wherein the impeller assembly is located in the axial direction of the casing The housing includes a coaxial fan casing and a motor casing, the fan casing is located outside the motor casing, and the first airflow communicating with the impeller assembly is formed between the fan casing and the motor casing channel, the first motor for driving the impeller assembly to rotate is arranged in the motor casing; the valve assembly is arranged at the other end in the axial direction of the housing, and the valve assembly includes: a valve body, the valve The body is connected with the housing, and the valve body is provided with an air intake channel that passes through the valve body and communicates with the first air flow channel; the valve stem penetrates the valve body in the axial direction and partially extends into the motor In the housing, the valve stem is connected to the valve body in a limited axial movement; the valve cover is fixedly connected to the end of the valve stem away from the housing; wherein, the valve stem drives the valve cover to It moves between a first position close to the valve body to close the intake passage and a second position away from the valve body to open the intake passage.

In some embodiments, the valve body includes a central body and an annular body surrounding the central body, the intake channel is located between the annular body and the central body, and the intake channel There is a connecting rib connecting the annular body and the central body inside; wherein, the central body abuts against the motor casing, the annular body is fixedly connected to the fan casing, and the valve stem is connected to the fan casing. The central body is movably connected and the valve stem is spaced from the first motor.

In some embodiments, the central 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 partly located in the motor housing .

In some embodiments, the valve assembly further includes: a gasket, attached to an end of the valve body close to the valve cover and located outside the intake channel, the valve cover is in the first position and The gasket is engaged, and the valve cover is separated from the gasket in the second position.

In some embodiments, the impeller assembly includes: an impeller connected to the first motor to rotate axially with the driving of the first motor, the impeller has a second airflow channel communicated with the first an airflow channel; a diffuser, the diffuser includes an inner edge part and an outer edge part coaxial with the impeller, and the outer edge part is arranged on the outside of the impeller and is fixedly connected with the housing, The inner edge part abuts against the impeller, and an air outlet channel communicating with the second airflow channel is formed between the inner edge part and the outer edge part, and the cross-sectional area of the air outlet channel in the vertical direction varies with increasing away from the impeller.

In some embodiments, the impeller includes: a disc, arranged at the end of the first motor away from the valve assembly and connected to the output shaft of the first motor, the disc has axially opposite The first end and the second end of the first end, from the first end to the second end, the cross-sectional area of the wheel in the vertical axis gradually increases; a plurality of blades are arranged on the wheel at intervals along the circumferential direction On the outer surface of the disc, each vane extends from close to the first end to the second end of the disc, and the second air flow channel is formed between adjacent vanes; wherein, the inner part of the diffuser The edge part is arranged on the second end of the wheel and is smoothly connected with the wheel and extends outward.

In some embodiments, the minimum clearance between the outer edge part of the diffuser and the outer edge of the vane is 0.15-0.25mm.

In some embodiments, the width of the cross-section of the vertical axis of the outlet channel is a constant value, and/or, the width of the cross-section of the vertical axis of the second airflow channel is a constant value, and/or, each The vanes are arranged with equal thicknesses along the extending direction of the second airflow channel.

In some embodiments, the impeller assembly further includes: a protective cover arranged at the end of the diffuser away from the impeller in the axial direction, and the protective cover covers the inner edge part of the diffuser The enclosed space, and the protective cover is fixed with the inner edge part.

In some embodiments, the inflation and deflation device further includes a fixing assembly, and the fixing assembly includes: a flange disposed inside the aerostat and connected to the shell disposed outside the aerostat The body is fixedly connected; the mounting plate is arranged outside the aerostat, and is fixedly connected with the flange and the diffuser; wherein, the diffuser is arranged inside the aerostat.

An embodiment of the present invention provides an inflation and deflation device for a stratospheric aerostat, including a fan assembly and a valve assembly. The fan assembly includes a coaxial casing; the casing includes a coaxial fan casing and a motor casing, and a first air flow channel is formed between the fan casing and the motor casing. The valve assembly includes a valve body, a valve stem and a valve cover, the valve body is connected to the housing, and the valve body is provided with an air intake passage that runs through the valve body and communicates with the first airflow passage; the valve stem penetrates the valve body in the axial direction and partially extends into the motor In the casing, the valve stem is connected with the valve body in a limited axially movable manner. In the embodiment of the present invention, the valve body is connected to the housing, and an air intake channel is opened on the valve body to pass through the valve body and communicate with the first air flow channel, so that the air flow can directly enter the first air flow in the housing through the air intake channel of the valve body Channels, without the need for collectors for collecting airflow and fairings for adjusting the flow direction of airflow, which simplifies the overall structure of the inflation and deflation device. And because the valve stem penetrates the valve body in the axial direction and partially extends into the motor casing, the valve stem will not protrude too much outside the casing, and the valve stem and the valve body can be connected in a limited axial movement, and the valve stem can drive the valve cover closer The valve body is used to close the intake passage or is away from the valve body to open the intake passage, so that when the valve stem completely closes the intake passage, most of the valve stem extends into the motor casing, which is beneficial to realize the overall structure of the inflation and deflation device. Integration and miniaturization.

Description of drawings

Fig. 1 is the three-dimensional structure diagram of the inflation and deflation device (valve assembly is in the first position) of the embodiment of the present invention;

FIG. 2 is a schematic perspective view of the three-dimensional structure of the inflation and deflation device (the valve assembly is in the second position) according to the embodiment of the present invention;

Fig. 3 is a cross-sectional view of the A-A direction shown in Fig. 1 of the inflation and deflation device according to the embodiment of the present invention;

Fig. 4 is a cross-sectional view of the B-B direction shown in Fig. 2 of the inflation and deflation device according to the embodiment of the present invention;

FIG. 5 is a schematic perspective view of the three-dimensional structure of the valve assembly of the embodiment of the present invention;

Fig. 6 is a sectional view of the valve assembly (the valve assembly is in the first position and the second position at the same time) of the embodiment of the present invention;

Fig. 7 is a three-dimensional structural schematic diagram of a fan casing and a motor casing according to an embodiment of the present invention;

8 is a cross-sectional view of an impeller assembly according to an embodiment of the present invention;

Fig. 9 is a perspective view of the three-dimensional structure of an impeller according to an embodiment of the present invention;

Fig. 10 is a schematic perspective view of the three-dimensional structure of the impeller according to another angle of the embodiment of the present invention;

Fig. 11 is a cross-sectional view of a fixing assembly according to an embodiment of the present invention;

Fig. 12 is a schematic perspective view of a diffuser according to an embodiment of the present invention.

Explanation of reference signs:

100. Inflatable and deflated device; 10. Fan assembly; 1. Housing; 11. Fan housing; 12. Motor housing; 13. First airflow channel; 14. First motor; 141. Output shaft; 142. Line column; 15. Connector; 2. Impeller assembly; 21. Impeller; 211. Disc; 2111. First end; 2112. Second end; 212. Blade; 22. Second air flow channel; 23. Diffuser; 231. Inner edge part; 232, outer edge part; 233, air outlet channel; 234, support column; 24, protective cover; 3, valve assembly; 31, valve body; 311, intake channel; 312, central body; Body; 314, connecting rib; 315, second motor; 32, valve stem; 33, valve cover; 34, gasket; 4, fixed component; 41, flange plate; 42, mounting plate;

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The various specific technical features described in the specific embodiments can be combined in any suitable manner if there is no 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 specific technical features in the present invention will not be further described.

In the following description, the terms "first\second\..." are used only to distinguish different objects, and do not mean that there are similarities or connections among the objects. It should be understood that the orientation descriptions "above", "below", "outside" and "inside" are all orientations in the normal use state, and the directions of "left" and "right" represent the specific corresponding schematic diagrams. The indicated left and right directions may or may not be the left and right directions in a normal use state.

It should be noted that the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes none other elements specifically listed, or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article or apparatus comprising that element. "Multiple" means greater than or equal to two.

As shown in FIGS. 1 and 2 , an embodiment of the present invention provides an inflation and deflation device 100 for a stratospheric aerostat, including a fan assembly 10 and a valve assembly 3 . The aerostat includes a capsule, and the inflation and deflation device 100 is used to inflate the capsule. Wherein, the fan assembly 10 includes a coaxial housing 1 and an impeller assembly 2, that is, 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 regarded as axisymmetric structures , but it is not required that the casing 1 and the impeller assembly 2 are absolutely axisymmetric, and the axis is L as shown in FIG. 1 and FIG. 2 . The impeller assembly 2 is located at one end of the casing 1 in the axial direction, and the axial direction is the extension direction of the axis L. As shown in Figures 3 and 4, the casing 1 includes a coaxial fan casing 11 and a motor casing 12, the fan casing One end of 11 is fixedly connected with the impeller assembly 2, the fan casing 11 is located outside the motor casing 12, the fan casing 11 is fixedly connected with the motor casing 12, and the first air flow channel 13 communicating with the impeller assembly 2 is formed between the fan casing 11 and the motor casing 12 , both ends of the fan casing 11 and the motor casing 12 are openings, and the openings at one end of the fan casing 11 and the motor casing 12 communicate with the impeller assembly 2, and the airflow flowing into the first airflow channel 13 can flow into the impeller assembly 2. It can be understood that the impeller A channel for air flow is formed in the assembly 2 , and the first air flow channel 13 communicates with the channel in the impeller assembly 2 .

As shown in Figures 3 and 4, a first motor 14 for driving the impeller assembly 2 to rotate is arranged in the motor casing 12, and the first airflow channel 13 is located outside the motor casing 12, and when the airflow passes through the first airflow channel 13, it can effectively The heat generated by the operation of the first motor 14 is taken away, and the temperature of the first motor 14 is cooled. The stator part inside the first motor 14 is fixed with the motor housing 12 by shrink-fitting, the front and rear covers of the first motor 14 are connected with the motor housing 12 by fasteners such as bolts, and the bearing and the wave spring of the first motor 14 are placed The interior of the front and rear covers of the first motor 14 is used to connect the rotor part of the first motor 14 . The space of the rear cover of the first motor 14 is used for installing electronic components such as a driver of the first motor 14 . The casing 1 is also provided with a wire post 142 that runs through the motor housing 12 and the fan housing 11 . The wire post 142 is hollow, and the control and power supply cables connected to the motor lead to the outside through the inner cavity of the wire post 142 .

As shown in FIG. 3 and FIG. 4 , the valve assembly 3 is arranged at the other end of the casing 1 in the axial direction, and the valve assembly 3 and the impeller assembly 2 are connected to the casing 1 at opposite ends of the casing 1 in the axial direction. . The valve assembly 3 includes a valve body 31 , a valve stem 32 and a valve cover 33 . The valve body 31 is connected to the housing 1 , for example, a bolt hole is opened in the valve body 31 , and it is fixedly connected to the fan housing 11 by fasteners such as bolts. The valve body 31 defines an intake passage 311 that runs through the valve body 31 and communicates with the first airflow passage 13. For example, the intake passage 311 may extend along the axial direction L; the valve stem 32 penetrates the valve body 31 in the axial direction and partially extends into the In the motor housing 12, the valve stem 32 is connected to the valve body 31 and can move in the axial direction L relative to the valve body 31; the valve cover 33 is fixedly connected to the end of the valve stem 32 away from the housing 1; wherein, FIG. 3 shows the valve assembly 3 In the first position, the valve cover 33 is attached to the valve body 31 to close the intake passage 311 . FIG. 4 shows that the valve assembly 3 is in the second position, and the valve cover 33 is away from the valve body 31 to open the intake passage 311 .

In the embodiment of the present invention, the valve body is connected to the housing, and an air intake channel is opened on the valve body to pass through the valve body and communicate with the first air flow channel, so that the air flow can directly enter the first air flow in the housing through the air intake channel of the valve body Channel, without connecting the collector to the valve assembly, so that the air flows into the intake channel and then flows into the first air channel formed between the fan housing and the motor housing through the collector, because the intake channel and the first air channel communication, and the first airflow passage is set between the fan casing and the motor casing, so the cross-sectional area of the first airflow passage perpendicular to the axial direction is small, so that the current collection efficiency is high, so there is no need to set a fairing to increase the collection efficiency , making the overall structure of the inflation and deflation device more simplified. And because the valve stem penetrates the valve body in the axial direction and partially extends into the motor casing, the valve stem will not protrude too much outside the casing, and the valve stem and the valve body can be connected in a limited axial movement, and the valve stem can drive the valve cover closer The valve body is used to close the intake passage or is away from the valve body to open the intake passage, so that when the valve stem completely closes the intake passage, most of the valve stem extends into the motor casing, which can realize the integration of the overall structure of the inflation and deflation device miniaturization.

In some embodiments, as shown in FIG. 5 , the valve body 31 includes a central body 312 and an annular body 313 surrounding the central body 312, the intake channel 311 is located between the annular body 313 and the central body 312, and the intake air The passage 311 is provided with a connecting rib 314 connecting the annular body 313 and the central body 312, and the air intake passage 311 is divided into multiple parts by the connecting rib 314; wherein, as shown in Figures 3 and 4, the central body 312 and the motor casing 12, the annular body 313 is fixedly connected with the fan housing 11, specifically, bolt holes are opened in the annular body 313, and the fan housing 11 is fixedly connected with fasteners such as bolts. The valve rod 32 runs through the central body 312 and is movably connected with the central body 312. As shown in FIG. 3 and FIG. The space is for the valve rod 32 to move relative to the central body 312 in the first position and the second position. The embodiment of the present invention further defines the structure of the valve body. By opening an air intake channel between the annular body and the central body, the central body abuts against the motor casing, the annular body is fixedly connected to the fan casing, and the motor casing and the fan casing A first airflow passage is formed between them, so the airflow flowing into the intake passage can directly enter the first airflow passage.

In some embodiments, as shown in FIG. 6 , the central body 312 is also provided with a second motor 315, the second motor 315 and the valve cover 33 are respectively located on opposite sides of the valve body 31, and the second motor 315 is provided with a gear set and The bearing is in transmission connection with the valve stem 32 , and the second motor 315 drives the valve stem 32 to move relative to the valve body 31 by driving the gear set. The second motor 315 is at least partially located in the motor housing 12 . It can be understood that a part of the second motor 315 can be located in the motor housing 12 , and another part can be located outside the motor housing 12 , or the second motor 315 can be completely located in the motor housing 12 . The embodiment of the present invention further defines that the second motor is at least partially located in the motor casing, and the space in the fan assembly is further utilized to improve the integration of the inflation and deflation device.

In some embodiments, as shown in FIG. 5 and FIG. 6 , four connecting ribs 314 may be provided, all of which are distributed between the annular body 313 and the central body 312, and the air intake channel 311 is divided into four parts by the partition ribs, It can effectively increase the stability of the inlet airflow. Preferably, the connecting ribs 314 can be uniformly arranged between the annular body 313 and the central body 312 . As shown in Figure 7, the fan casing 11 and the motor casing 12 are fixedly connected by a connecting piece 15, the connecting piece 15 can be a partition rib, and the partition ribs can be set to four, which are all distributed between the fan casing 11 and the motor casing 12. An air flow channel 13 is divided into four parts by the dividing ribs, the angles of the connecting ribs 314 and the connecting parts 15 distributed in the circumferential direction are consistent, and each connecting rib 314 is correspondingly provided with a connecting part 15 in the direction extending in the axial direction, so that The airflow in the air passage can directly flow into the corresponding first airflow passage.

In some embodiments, as shown in FIG. 6 , the valve assembly 3 further includes a gasket 34 made of foamed silicone rubber, which has good low-temperature performance and is not easily brittle. The sealing gasket 34 is attached to the end of the valve body 31 close to the valve cover 33 and is located outside the intake passage 311. Specifically, the sealing gasket 34 is attached to the end of the annular body 313 close to the valve cover 33, and the sealing gasket 34 is ring-shaped Body 313 is distributed for a week. The valve cover 33 is attached to the gasket 34 at the first position, and the valve cover 33 is separated from the gasket 34 at the second position. The embodiment of the present invention defines that the sealing gasket is attached to the end of the valve body close to the valve cover and is located outside the air intake passage, so that the valve cover seals the intake passage when the valve cover is attached to the sealing gasket at the first position, and the valve cover is in the second position. The air intake channel is opened when the gasket is separated.

In some embodiments, as shown in FIG. 8 , the impeller assembly 2 includes an impeller 21 and a diffuser 23 . Wherein, as shown in FIG. 3 and FIG. 4 , the impeller 21 is connected to the first motor 14 , the first motor 14 can drive the impeller 21 to rotate around the axial direction, and the impeller 21 has a second airflow passage 22 communicating with the first airflow passage 13 . The diffuser 23 includes an inner part 231 and an outer part 232 coaxial with the impeller 21 , the outer part 232 is arranged outside the impeller 21 , and the outer part 232 is equivalent to the wheel cover of the impeller 21 . The outer edge part 232 is fixedly connected with the casing 1 , specifically, a circle of bolt holes is provided at the bottom of the outer edge part 232 , and is fixedly connected with the fan casing 11 by fasteners such as bolts. The inner edge part 231 abuts against the impeller 21, and an air outlet passage 233 communicating with the second airflow passage 22 is formed between the inner edge part 231 and the outer edge part 232, and the airflow can enter the second airflow passage 22 from the first airflow passage 13, and then The air outlet channel 233 enters the capsule of the aerostat. The capsule of the aerostat includes a helium bladder and an air bladder. The air outlet channel 233 is generally used to inflate the air bladder of the aerostat.

As shown in Figure 8, a plurality of support columns 234 are arranged between the outer edge part 232 and the inner edge part 231 to support the inner edge part 231, and the cross-sectional area of the air outlet channel 233 in the vertical direction increases as it moves away from the impeller 21, and increases with the distance from the impeller 21. As the diameter of the air outlet channel 233 increases, the flow area of the air flow increases accordingly, the flow velocity decreases, the pressure increases, and the air flow tends to flow uniformly, so that the dynamic pressure on the air outlet side of the impeller 21 changes to static pressure. In some embodiments, the air outlet channel 233 is supported by a plurality of evenly distributed support columns 234, which is conducive to the balanced force and stable connection between the outer edge part 232 and the inner edge part 231, and the inner edge part is not easy to move under the influence of the airflow impact. One side is inclined, which affects the smooth flow of airflow through the intake channel.

In the embodiment of the present invention, the outer edge part is arranged on the outside of the impeller and is fixedly connected with the casing. The outer edge part acts as the impeller wheel cover and together with the impeller forms a second air flow passage communicated with the first air flow passage. The bottom of the edge part is fixedly connected with the shell to ensure that the airflow of the first airflow channel can flow smoothly into the second airflow channel, and an air outlet channel communicating with the second airflow channel is formed between the inner edge part and the outer edge part, and the air outlet channel is perpendicular to the axial direction The cross-sectional area of the impeller increases as it moves away from the impeller, so that the airflow velocity decreases, the pressure increases, and the airflow tends to flow uniformly, thereby realizing the transition from dynamic pressure to static pressure on the outlet side of the impeller. The diffuser also has connections, wheel covers and The function of the diffuser not only tends to simplify the overall structure, but also realizes the diversification of the diffuser function.

In some embodiments, as shown in FIG. 9 , the impeller 21 includes a disc 211 and a plurality of blades 212 . Wherein, as shown in Fig. 3 and Fig. 4, the wheel disc 211 is arranged on 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, and the output shaft 141 drives the wheel disc 211 around the shaft to turn. The disc 211 has a first end 2111 and a second end 2112 opposite in the axial direction, and the airflow enters the second airflow channel 22 from the first end 2111 (intake side), and flows from the second end 2112 (outlet side) of the impeller 21 out of the second gas flow channel 22 .

As shown in Figures 9 and 10, a plurality of blades 212 are arranged at intervals along the circumferential direction on the outer surface of the wheel 211, and the blades 212 may be three-dimensional twisted blades 212, where the three-dimensional twisted blades 212 refer to the shape of the blades 212 in There are changes in the three directions of xyz, so that the blade 212 can better adapt to the flow of the airflow. In some embodiments, the blades 212 can obtain three-element twisted blades with less resistance through the simulation software based on fluid mechanics, and the torsion angles of multiple blades 212 are the same. In some embodiments, the number of blades 212 may be twenty. In some embodiments, the blade 212 has an inlet twist angle of 37.4 degrees to 29.5 degrees and an outlet twist angle of 49 degrees to 52 degrees. The design of the twist angle is conducive to the smooth flow of air from the intake side to the outlet side under the action of centrifugal force and axial force.

It should be added that, referring to Figure 8 and Figure 9, the impeller 21 can be integrally 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 accidental damage. The blade 212 is damaged, and at the same time, the salt spray corrosion resistance of the impeller 21 is improved. In some embodiments, the impeller 21 is designed to reduce weight according to the high-altitude environment requirements. For example, the weight of the impeller 21 can be 0.23kg, the inlet diameter Bh of the disc 211 is 84mm, and the outlet width b2 is 10mm. It needs to be supplemented Yes, the outlet width b2 is the vertical linear distance between the inner part 231 and the outer part 232 of the diffuser 23, and the outlet diameter of the impeller 21 is d2=140mm. The impeller 21 is designed with a rated speed of 25,000-30,000rpm, and the required power is about 400w at a height of 20km. At the design point, it can provide a flow rate of 1200m3/h and a pressure head of 1200pa, and the overall efficiency can reach 82%.

As shown in FIG. 9, each blade 212 extends from the first end 2111 to the second end 2112 of the disc 211, and the second airflow channel 22 is formed between adjacent blades 212. Since the first end 2111 to the second end 2112 , the cross-sectional area of the wheel disk 21 in the vertical direction gradually increases, so that the flow area of the airflow in the second airflow channel 22 increases.

As shown in Figure 8, the airflow direction entering the second airflow channel 22 from the first end 2111 (intake side) of the impeller 21 is parallel to the axial direction of the impeller 21, and flows out from the second end 2112 (air outlet side) of the impeller 21. The airflow direction of the two airflow passages 22 is arranged at an acute angle with the axial direction of the impeller 21, so that the airflow of the second airflow passage 22 deflects in the process of passing through the impeller 21, and turns from the axial direction of the impeller 21 to have the same direction as the axial direction of the impeller 21. The direction of a certain acute angle, that is, equivalent to the principle of a mixed flow fan, the impeller 21 allows the airflow to perform both centrifugal and axial movements, which improves the pressure head, flow rate and response time, thereby improving the height adjustment capability of the aerostat . Specifically, the airflow direction of the second airflow passage 22 flowing out of 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 a. For example, the angle after assembly is a can be equal to 60 degrees.

The principle of the mixed flow fan: as shown in Figure 8 and Figure 9, a plurality of blades 212 are arranged on the outer surface of the disk 211 at intervals in the circumferential direction, and each blade 212 extends from the first end 2111 close to the second end of the disk 211 2112 , forming a second airflow channel 22 between adjacent blades 212 . Since the cross-sectional area of the wheel disk 21 vertically increases gradually, the area of the second airflow passage 22 gradually increases from the first end 2111 to the second end 2112, and the area of the second airflow passage 22 refers to the area of the second airflow passage 22 Cross-sectional area, the cross-sectional area is the area of the second airflow passage 22 on a cross section perpendicular to the extension direction (ie axial direction) of the second airflow passage 22 . As the area of the second airflow channel 22 increases, the flow velocity decreases, and the corresponding airflow pressure increases. Through the arrangement of the impeller and the diffuser, the airflow that flows axially from the first end 2111 first passes through the impeller to rotate and accelerate, and then through the action of centrifugal force Flowing radially outward, the airflow decelerates and pressurizes during the radial outflow process, so that the pressure of the airflow flowing radially out of the second airflow channel 22 at the second end 2112 is greatly increased relative to the pressure of the airflow flowing in axially, which plays a role of centrifugal force. The supercharging function of the fan makes the fan more suitable for the use environment with low air density and low atmospheric pressure in the stratosphere.

As shown in FIG. 8 , the inner edge part 231 of the diffuser 23 is disposed on the second end 2112 of the wheel 211 and smoothly connected with the wheel 211 and extends outward. It should be added that the inner edge part 231 is arranged in the extending direction of the wheel 211, and there is a gap between the inner edge part 231 and the wheel 211, and the inner edge part 231 is not fixed with the wheel 211. At this time, when When the wheel disc 211 rotates around the axis of the impeller 21 , the inner edge member 231 does not rotate with the wheel disc 211 .

In some embodiments, as shown in FIG. 8 , the width of the channel between the outer edge member 232 and the disc 211 gradually decreases from the air inlet side to the air outlet side. The width gradually decreases, causing the gas flow velocity to increase, thereby achieving rapid compression of the gas.

The embodiment of the present invention defines the structure of the impeller. The cross-sectional area of the disk in the vertical direction increases gradually. A plurality of blades are arranged on the outer surface of the disk at intervals along the circumference. The air flow first passes through the rotation of the impeller to accelerate, and flows radially outward through the action of centrifugal force. During the process of radial outflow, the airflow decelerates and pressurizes, so that the pressure of the airflow radially flowing out of the diffuser at the second end is relative to the pressure of the airflow flowing in axially. There is a big improvement, and it has the function of supercharging the centrifugal fan, making the fan more suitable for the use environment with low air density and low atmospheric pressure in the stratosphere.

In some embodiments, as shown in FIG. 8, a tip gap is formed between the outer edge part 232 of the diffuser 23 and the top of the blade 212. The tip gap is shown as b in FIG. The gap is 0.15-0.25mm. The blade tip clearance is an important factor affecting the efficiency of the impeller 21. A suitable blade tip clearance is related to the efficiency of the impeller 21 and the safety of the impeller 21 operation. If the blade tip clearance is too large, the efficiency of the impeller 21 will be greatly reduced. If the blade tip clearance is too small, The impeller 21 will collide with the outer edge part 232 and damage the blade 212. In severe cases, the entire impeller 21 will be stuck. The centrifugal force will cause the tip clearance of the blade 212 to decrease, and the material shrinkage caused by low temperature will increase the tip clearance. , in some embodiments, the impeller 21 can obtain a suitable blade tip clearance through a simulation software based on fluid mechanics, and in some embodiments, the generatrix forming the inner wall surface of the outer edge part 232 can be obtained through optimization based on fluid mechanics calculations. The embodiment of the present invention limits the blade tip clearance formed between the outer edge part and the top of the blade to be 0.15-0.25mm, which can ensure the efficiency of the blade and the operation under various working conditions.

In some embodiments, as shown in FIG. 8 , the width of the cross-section of the air outlet passage 233 in the vertical direction is constant, that is, the distance between the inner edge part 231 and the outer edge part 232 forming the air outlet passage 233 is equal. , and/or, as shown in FIG. 9 , the width of the cross-section of the vertical axis of the second airflow channel 22 is a constant value. It can be understood that all the blades 212 are equally spaced on the wheel disk 211, and the adjacent blades 212 are formed between The width of the second airflow passage 22 is the same, and/or, as shown in FIG. 9 , in order to take into account the strength characteristics and aerodynamic characteristics of the impeller 21 at high rotational speeds, each blade 212 is arranged with equal thickness along the extending direction of the second airflow passage 22 , the thickness of the entire blade 212 may be 1 mm. The embodiment of the present invention defines that the width of the cross-section of the vertical axis of the air outlet channel is a constant value, and/or, the width of the cross-section of the vertical axis of the second airflow channel is a constant value, and/or, each blade is The extension direction of the channel is set to be equal in thickness, which is conducive to a more uniform flow of air in the air channel and reduces the impact of the air flow on the wall of the channel.

In some embodiments, as shown in FIG. 8 , the impeller assembly 2 further includes a protective cover 24 , the protective cover 24 is arranged on the end of the diffuser 23 away from the impeller 21 in the axial direction, and the protective cover 24 is fixedly connected to the inner edge member 231 , so that it is located on the top of the inflation and deflation device, and is located in the capsule of the aerostat. The protective cover 24 covers the space surrounded by the inner edge part 231 of the diffuser 23. The surface of the protective cover 24 is smooth without edges and corners. The protective cover 24 is made of low temperature resistant transparent polypropylene material. In the embodiment of the present invention, a protective cover is provided to cover the space surrounded by the inner edge parts of the diffuser, so as to prevent the capsule body of the aerostat from contacting the rotating impeller before it is formed, so as to play a protective role, and during the ground test stage , the rotation of the impeller can be observed through the protective cover, which has the characteristics of light weight and beautiful appearance.

In some embodiments, as shown in FIG. 3 , FIG. 4 and FIG. 11 , the inflation and deflation device 100 further includes a fixing component 4 . The fixing assembly 4 includes a flange 41, which is arranged inside the aerostat and is fixedly connected with the casing 1 arranged outside the aerostat. Specifically, the flange 41 has two circles of bolt holes, and the pressure ring 43 is provided with a circle of bolt holes, the bolt holes of the outer ring are fixedly connected with the pressure ring 43, the pressure ring 43 is arranged adjacent to the mounting plate 42 in the direction perpendicular to the axial direction, the pressure ring 43 is located on the outside of the mounting plate 42, and the flange 41 The inner ring bolt holes are connected with the mounting plate 42 . The mounting plate 42 is arranged on the outside of the aerostat, and is fixedly connected with the flange 41 and the diffuser 23. Specifically, the structure of the mounting plate 42 is a ring shape, and the mounting plate 42 has two circles of bolt holes. The bolt holes at the bottom of the diffuser 23 are connected, and the outer ring is connected with the bolt holes of the inner ring of the flange 41, thereby realizing the fixing of the diffuser and the flange. The diffuser 23 is arranged inside the aerostat, as shown in Figure 12, which illustrates the specific structure of the diffuser, the bottom of the diffuser 23 has double rows of bolt holes, and the inner ring is provided with a plurality of evenly distributed bolt holes , used to connect the motor casing 12, the bolt holes of the outer ring and the bolt holes of the inner ring are arranged differently by 15 degrees, and are used for fixed connection with the bolt holes of the inner ring of the mounting plate 42, the inner and outer sides of the aerostat are shown in Figure 3 and Figure 4 Inward and outward direction.

When the inflation and deflation device 100 is integrated with the airship, a round hole is first opened on the hull, the flange 41 is placed on the inner side of the hull membrane, and then the pressure ring 43 is placed on the outer side of the hull membrane, and then through screws, etc. Fasteners pass through the hull film, and are threadedly connected with the flange 41 to form a compression, so that the outer ring bolt holes of the flange 19 cooperate with the pressure ring 43 to clamp the hull film material in the middle.

In the embodiment of the present invention, the inflation and deflation device is fixedly connected to the boat body through the fixed assembly, and the membrane material of the boat body is sandwiched by the cooperation of the flange plate and the pressure ring, and the seal is formed by the pre-tightening force of the bolts, which is beneficial to the flow of air in the air. The air flows in the air channel and flows out smoothly from the air outlet.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (10)

1. An inflation and deflation device for a stratospheric aerostat, comprising:

the fan assembly comprises a shell and an impeller assembly which are coaxially arranged; the impeller assembly is positioned at one axial end of the shell, the shell comprises a fan shell and a motor shell which are coaxially arranged, the fan shell is positioned outside the motor shell, a first air flow channel communicated with the impeller assembly is formed between the fan shell and the motor shell, and a first motor used for driving the impeller assembly to rotate is arranged in the motor shell;

a valve assembly provided at the other end of the housing in the axial direction, the valve assembly including:

the valve body is connected with the shell and provided with an air inlet channel which penetrates through the valve body and is communicated with the first air flow channel;

a valve rod which axially penetrates through the valve body and partially extends into the motor shell, and the valve rod is connected with the valve body in a limited axial movement mode;

the valve cover is fixedly connected to one end, far away from the shell, of the valve rod;

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 far away from the valve body to open the air inlet channel.

2. The inflation and deflation device as claimed in claim 1, wherein the valve body comprises a central body and an annular body surrounding the central body, the air inlet passage is located between the annular body and the central body, and a connecting rib connecting the annular body and the central body is arranged in the air inlet passage;

the central body is abutted to the motor shell, the annular body is fixedly connected with the fan shell, the valve rod is movably connected with the central body, and the valve rod is spaced from the first motor.

3. The charging and discharging device according to claim 2, wherein the central body is further provided with a second motor, the second motor is in transmission connection with the valve rod to drive the valve rod to move, and the second motor is at least partially positioned in the motor housing.

4. The inflation and deflation device of claim 2 wherein the valve assembly further comprises:

sealed pad, the laminating is in the valve body is close to the one end of valve gap just is located the inlet channel outside, the valve gap is in the primary importance with sealed pad laminating, the valve gap is in the secondary importance with sealed pad separation.

5. Discharge and fill device according to any one of claims 1 to 4, wherein the impeller assembly comprises:

the impeller is connected with the first motor to rotate around the axial direction along with the driving of the first motor, and the impeller is provided with a second air flow channel communicated with the first air flow channel;

the diffuser comprises an inner edge component and an outer edge component which are coaxial with the impeller, the outer edge component is arranged on the outer side of the impeller and fixedly connected with the shell, the inner edge component is abutted against the impeller, an air outlet channel communicated with the second air flow channel is formed between the inner edge component and the outer edge component, and the vertical and axial cross-sectional area of the air outlet channel is increased along with the increase of the cross-sectional area of the air outlet channel away from the impeller.

6. Discharge and fill device according to claim 5, wherein the impeller comprises:

the wheel disc is arranged at one end of the first motor far away from the valve assembly and is connected with an output shaft of the first motor, the wheel disc is provided with a first end and a second end which are opposite in the axial direction, and the cross section area of the wheel disc is gradually increased from the first end to the second end in the vertical axial direction;

a plurality of blades circumferentially spaced on an outer surface of the disk, each blade extending from proximate the first end to the second end of the disk, the second airflow channel being formed between adjacent blades;

wherein an inner edge member of the diffuser is disposed at the second end of the disk and is smoothly connected to the disk and extends outward.

7. The charge and discharge device according to claim 6, wherein a minimum clearance between the outer edge member of the diffuser and the outer edge of the vane is 0.15 to 0.25mm.

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

9. The inflation and deflation device of claim 5 wherein the impeller assembly further comprises:

the safety cover sets up in the axial the diffuser is kept away from the one end of impeller, the safety cover covers the diffuser the space that inner edge part surrounded, just the safety cover with inner edge part is fixed.

10. Inflation and deflation arrangement as claimed in any of claims 1-4, wherein the inflation and deflation arrangement further comprises a fixation assembly comprising:

the flange plate is arranged on the inner side of the aerostat and is fixedly connected with the shell arranged on the outer side of the aerostat;

the mounting plate is arranged on the outer side of the aerostat and fixedly connected with the flange plate and the diffuser; wherein, the diffuser sets up in aerostatics inboard.

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