Channel type guide plate based on inverted conical pore plate structure

Abstract

The invention provides a channel type flow guide plate based on an inverted-cone-shaped pore plate structure. The channel type flow guide plate comprises a capillary porous plate and a groove structure. And the channel type guide plate is connected with a liquid accumulator at the bottom of the storage box through a bracket. The channel type flow guide plate is parallel to the inner wall face of the storage box and extends to the top of the storage box along the inner wall face. The cross section of the channel type guide plate is of a trapezoidal structure, the channel type guide plate is hollow, and a closed channel is formed for propellant flowing. A capillary perforated plate is arranged on the side, close to the wall face of the storage box, of the channel type flow guide plate, a plurality of micron-sized inverted-cone-shaped capillary pores are formed in the capillary perforated plate in a single-side laser drilling mode, and the functions of storing liquid and serving as a gas barrier can be achieved. The channel type guide plate is suitable for a satellite propulsion system with strong maneuverability and high acceleration, has the advantages of simple structure, portability, high reliability, strong flow conductivity and the like, and can provide guidance for the development of a third-generation surface tension storage tank PMD.

Description

Technical Field

[0001] The present invention relates to the technical field of propellant management in a space microgravity environment, and in particular to a channel-type guide plate based on an inverted cone orifice plate structure. Background Art

[0002] The surface tension tank is the most commonly used tank in satellite propulsion systems. It has the characteristics of light weight, high reliability and long life. The core part of the surface tension tank is the propellant management device (PMD) inside it. The PMD consists of welded components installed in the tank and is designed to provide the spacecraft with non-air-entrained propellant liquid under specified flow and acceleration conditions. With the development of PMD structure, the types of surface tension tanks can be divided into the first representative surface tension tank based on screen structure and the second representative surface tension tank based on plate structure.

[0003] Early PMDs generally used stainless steel mesh as capillary elements, while the acquisition and supply of propellants were mainly based on channel-type components. This component formed a closed flow path for the propellant, combined with the gas barrier function of the mesh, and can be used in higher flow and acceleration environments. However, the channel-type PMD structure is relatively complex, expensive, high-risk, and not very reliable. The second-generation surface tension tank was developed on the basis of the first-generation surface tension tank. The plate structure replaced the vulnerable mesh structure, greatly improving the structural strength and reliability. It is simple, lightweight, and has a low manufacturing cost. Therefore, it has gradually become the mainstream of large satellite propellant tanks in the world. However, since the plate-type PMD relies entirely on surface tension, the ability of the liquid flow to resist acceleration and vibration is poor, and the propellant storage capacity is small, it is not suitable for large flow and high acceleration environments.

[0004] The future propulsion system needs to adapt to large reverse acceleration and have the ability to refuel at a large filling ratio on orbit. This also puts forward new requirements for the development of surface tension tanks. Not only must it be able to operate normally under large flow and high acceleration environments, but the PMD structural strength, operational safety and reliability, manufacturing and maintenance costs, etc. must also be guaranteed. Therefore, it is necessary to focus on the research of the new generation of capillary force-based flow control technology under large acceleration levels, combine the characteristics of the two-generation surface tension tank PMD, eliminate the inferior and retain the superior, and develop a plate-net hybrid third-generation surface tank, which has become the main development trend of the current propellant tank. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to propose a channel-type guide plate based on an inverted cone orifice plate structure. The guide plate is a channel-type guide plate for a propellant tank suitable for large flow and large acceleration environments, and is light in weight and highly reliable.

[0006] The present invention is achieved through the following technical scheme. The present invention proposes a channel-type guide plate based on an inverted cone orifice plate structure, wherein the guide plate includes a capillary porous plate 1a and a groove 1b, and the capillary porous plate 1a and the groove 1a are connected by welding; the channel-type guide plate 1 is connected to the liquid reservoir 3 at the bottom of the tank 4 through a bracket 2; the channel-type guide plate 1 is arranged parallel to the inner wall surface of the tank 4, and extends along the inner wall surface to the top of the tank 4; the capillary porous plate 1a is on the side of the channel-type guide plate 1 close to the wall surface of the tank 4, and a certain gap is set between the capillary porous plate 1a and the inner wall of the tank 4.

[0007] Furthermore, the channel-type guide plate 1 is an arc-shaped rectangular plate with a trapezoidal cross section and a hollow interior, so as to form a closed channel for the flow of propellant.

[0008] Furthermore, the capillary porous plate 1a is provided with a plurality of micrometer-sized inverted cone-shaped capillary holes by single-sided laser drilling, and the aperture is relatively large on the side close to the inner wall of the storage tank 4; the micrometer-sized inverted cone-shaped capillary holes are evenly staggered on the capillary porous plate 1a, and a certain distance is set between each hole; the capillary porous plate 1a plays the function of retaining liquid and serving as a gas barrier in the channel-type guide plate 1.

[0009] Furthermore, the structural shape of the groove 1b matches the structural shape of the porous capillary plate 1a.

[0010] Furthermore, there are four channel-type guide plates 1, and the angle between adjacent guide plates is 90°.

[0011] Furthermore, the aperture of the small hole is 0.01 mm to 0.1 mm.

[0012] Furthermore, the bubble bursting point pressure of the inverted cone capillary pore is not less than 4×10 4 σ, σ is the surface tension of the propellant liquid.

[0013] Furthermore, the distance between the centers of the small holes is 0.5 mm to 1 mm.

[0014] Furthermore, the thickness of the groove 1b and the porous capillary plate 1a are both 1 mm.

[0015] Furthermore, the gap between the capillary porous plate 1a and the inner wall of the storage box 4 is 2 mm to 8 mm.

[0016] The present invention has the following beneficial effects:

[0017] 1. The channel-type guide plate based on the inverted cone orifice plate structure of the present invention has a hollow structure inside the guide plate, which can form a closed flow path for the propellant liquid. Compared with the second-generation plate-type surface tension tank, the liquid flow guiding ability of the guide plate is retained, but it can adapt to a larger flow rate and a larger acceleration environment.

[0018] 2. The channel-type guide plate based on the inverted cone orifice plate structure of the present invention adopts a capillary porous plate structure to replace the screen structure of the first-generation channel-type surface tension storage tank. The laser drilling technology can realize the arrangement of micron-level small holes, thereby enhancing the wettability and bubble bursting point pressure of the capillary porous plate. The orifice plate structure has higher strength, and is safer and more reliable.

[0019] 3. The capillary porous plate in the channel-type guide plate based on the inverted cone orifice plate structure of the present invention adopts an inverted cone through-hole structure, which can obtain a larger bubble bursting point pressure than the general circular through-hole at the same aperture, and play a better gas barrier function.

[0020] 4. The channel-type guide plate based on the inverted cone orifice plate structure of the present invention is simple in structure, light in weight, and has low manufacturing cost. It not only has excellent propellant management capabilities, but also has strong anti-interference capabilities. It can be applied to satellite propulsion systems with strong maneuverability and high acceleration, and can provide guidance for the development of third-generation surface tension tanks (PMDs). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of assembling a channel-type guide plate based on an inverted cone orifice plate structure in a surface tension tank according to the present invention;

[0022] Figure 2 A schematic diagram of a channel-type guide plate based on an inverted cone orifice plate structure according to the present invention;

[0023] Figure 3 A schematic cross-sectional view of a channel-type guide plate based on an inverted conical orifice plate structure according to the present invention;

[0024] Figure 4 It is a schematic diagram of the cross section of the inverted cone-shaped small hole on the capillary porous plate of the present invention;

[0025] Figure 5 It is a schematic diagram of the arrangement of the inverted cone-shaped holes on the capillary porous plate of the present invention. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 5 The present invention proposes a channel guide plate based on an inverted cone orifice plate structure, wherein the guide plate comprises a capillary porous plate 1a and a groove 1b, wherein the capillary porous plate 1a and the groove 1a are connected by welding; the channel guide plate 1 is connected to a liquid reservoir 3 at the bottom of a storage tank 4 through a bracket 2; the channel guide plate 1 is made of stainless steel or titanium alloy, and the channel guide plate 1 is arranged parallel to the inner wall surface of the storage tank 4 and extends along the inner wall surface to the top of the storage tank 4; the capillary porous plate 1a is located on one side of the channel guide plate 1 close to the wall surface of the storage tank 4, and a certain gap is set between the capillary porous plate 1a and the inner wall of the storage tank 4.

[0028] The channel-type guide plate 1 is an arc-shaped rectangular plate with a trapezoidal cross section and a hollow interior, which can form a closed channel for the flow of propellant. The overall width of the channel-type guide plate is 40 mm to 80 mm.

[0029] The capillary porous plate 1a is provided with a plurality of micrometer-scale inverted cone-shaped capillary holes by single-sided laser drilling, and the aperture is relatively large on the side close to the inner wall of the storage tank 4; the micrometer-scale inverted cone-shaped capillary holes are evenly and staggeredly arranged on the capillary porous plate 1a, and a certain distance is set between each hole; the capillary porous plate 1a plays the function of retaining liquid and serving as a gas barrier in the channel-type guide plate 1.

[0030] The structural shape of the groove 1b matches the structural shape of the porous capillary plate 1a.

[0031] There are four channel-type guide plates 1, and the angle between adjacent guide plates is 90°.

[0032] The aperture of the small hole is 0.01mm~0.1mm.

[0033] The bubble breaking point pressure of the inverted cone capillary pore is not less than 4×10 4 σ, σ is the surface tension of the propellant liquid.

[0034] The distance between the centers of the small holes is 0.5 mm to 1 mm.

[0035] The thickness of the groove 1b and the porous capillary plate 1a are both 1 mm.

[0036] The gap between the capillary porous plate 1a and the inner wall of the storage tank 4 is 2 mm to 8 m.

[0037] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, the present invention provides a channel-type guide plate 1 based on an inverted cone orifice plate structure, which includes a capillary porous plate 1a and a groove 1b. The capillary porous plate 1a and the groove 1b are connected by welding, and a closed channel is formed inside for the propellant liquid to flow. The channel-type guide plate 1 is connected to the inside of the liquid reservoir 3 through a bracket 2, and the bracket 2 and the liquid reservoir 3 are welded.

[0039] Specifically, in this embodiment, the channel-type guide plate 1 is made of stainless steel or titanium alloy, is arranged parallel to the inner wall of the tank 4, and extends along the wall of the tank 4 to the top, thereby ensuring the long-range transportation capability of the propellant liquid and realizing the full management of the propellant liquid in the tank.

[0040] Specifically, in this embodiment, four channel guide plates 1 are evenly arranged along the circumferential direction in the tank 4, such as Figure 2 As shown, the angle between two adjacent channel-type guide plates 1 is 90°, which can ensure that at least one guide plate is submerged in the propellant under lateral accelerations in different directions.

[0041] Specifically, in this embodiment, the channel-type guide plate 1 has a capillary porous plate 1a on one side close to the wall of the tank 4, and a groove 1b on the other side. The channel-type guide plate 1 is an arc-shaped rectangular structure as a whole, and its cross section is a trapezoidal shape, such as Figure 3 As shown, the interior is hollow, forming a closed flow path for the propellant liquid. The wet porous element will prevent gas inhalation at a specific liquid level or pressure, and this pressure is called the bubble burst point. The capillary porous plate 1a can prevent gas penetration, and the propellant flows into the channel through the capillary porous plate 1a and then flows along the channel, thereby providing the aircraft with propellant liquid without air entrainment and adapting to large acceleration environments.

[0042] Specifically, in this embodiment, a plurality of inverted cone-shaped capillary holes are arranged on the capillary porous plate 1a by single-sided laser drilling, such as Figure 4 Laser drilling technology can achieve micron-level drilling, so that the porous capillary plate 1a has better wettability. At the same time, the smaller the capillary pore size, the greater the bubble rupture point pressure of the porous plate.

[0043] Preferably, in this embodiment, the diameter of the tapered hole on one side close to the inner wall of the tank 4 is D1, and the diameter of the other side is D2, and the diameter of the small hole meets the following requirements: 0.01 mm <D2<D1<0.1mm。

[0044] Specifically, in this embodiment, the bubble rupture point pressure of the selected inverted cone pore structure depends on the size of the pore diameter D2, and the bubble rupture point of the cone pore is greater than that of the cylindrical pore with the same diameter D2. The formula for calculating the bubble rupture point pressure of the cylindrical pore according to the Young-Laplace equation is:

[0045]

[0046] Where σ is the surface tension of the liquid and θ is the contact angle. Therefore, when the contact angle is 0°, the bubble bursting point pressure of the conical capillary pore for the propellant liquid is not less than 4×10 4 σ can be estimated based on the specific value of the propellant liquid surface tension.

[0047] Specifically, in this embodiment, the inverted cone-shaped capillary pores are evenly and staggeredly arranged on the capillary porous plate 1a, such as Figure 5 As shown, the circumferential distance between the centers of the small holes is L h , axial distance is L v , where L h With L v The value is about 0.5mm to 1mm, so that the capillary porous plate 1a provides sufficient flow area for propulsion and has greater structural strength.

[0048] Specifically, in this embodiment, the gap between the capillary porous plate 1a and the inner wall of the tank 4 is 2 mm to 8 mm, and sufficient propellant liquid is maintained between the capillary porous plate 1a and the inner wall of the tank 4 without destroying the surface tension effect, so as to ensure that the propellant passes through the capillary porous plate 1a smoothly into the guide plate. Therefore, it is necessary to reasonably control the gap between the capillary porous plate 1a and the inner wall of the tank 4 to prevent the gap from being too small, causing propellant blockage or insufficient propellant liquid in the channel-type guide plate 1.

[0049] Specifically, in this embodiment, the total width of the channel-type guide plate 1 is 40 mm to 80 mm, which ensures the propellant liquid transmission capability while maintaining the lightness of the guide plate structure.

[0050] Specifically, in this embodiment, the porous capillary plate 1a has a thickness of 1 mm, and the groove 1b has a thickness of 1 mm.

[0051] Specifically, in this embodiment, the structural shape of the groove 1b matches the structural shape of the porous capillary plate 1a, and they are connected by welding, thereby ensuring the structural strength of the channel-type guide plate.

[0052] The channel-type guide plate based on the orifice plate structure in the present invention combines the advantages of the first-generation channel-type surface tension tank PMD and the second-generation plate-type surface tension tank PMD, while ensuring the safety and reliability of the guide plate, achieving a large flow diversion capacity for non-air-entrained propellant liquid, and adapting to large acceleration environments.

[0053] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

[0054] The above only expresses the preferred implementation mode of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A channel-type guide plate based on an inverted cone orifice plate structure, characterized in that: The guide plate comprises a capillary porous plate (1a) and a groove (1b), wherein the capillary porous plate (1a) and the groove (1a) are connected by welding; the channel-type guide plate (1) is connected to a liquid reservoir (3) at the bottom of a storage tank (4) via a bracket (2); the channel-type guide plate (1) is arranged parallel to the inner wall surface of the storage tank (4) and extends along the inner wall surface to the top of the storage tank (4); the capillary porous plate (1a) is located on one side of the channel-type guide plate (1) close to the wall surface of the storage tank (4), and a certain gap is set between the capillary porous plate (1a) and the inner wall of the storage tank (4).

2. The guide plate according to claim 1, characterized in that: The channel-type guide plate (1) is an arc-shaped rectangular plate with a trapezoidal cross-section and a hollow interior, and can form a closed channel for the flow of propellant.

3. The guide plate according to claim 1, characterized in that: The capillary porous plate (1a) is provided with a plurality of micrometer-level inverted cone-shaped capillary holes by single-sided laser drilling, and the hole diameter on the side close to the inner wall of the storage tank (4) is relatively large; the micrometer-level inverted cone-shaped capillary holes are evenly and staggeredly arranged on the capillary porous plate (1a), and a certain distance is set between each hole; the capillary porous plate (1a) plays the function of retaining liquid and serving as a gas barrier in the channel-type guide plate (1).

4. The guide plate according to claim 1, characterized in that: The structural shape of the groove (1b) matches the structural shape of the porous capillary plate (1a).

5. The guide plate according to claim 1, characterized in that: There are four channel-type guide plates (1), and the angle between adjacent guide plates is 90°.

6. The guide plate according to claim 3, characterized in that: The aperture of the small hole is 0.01mm~0.1mm.

7. The guide plate according to claim 6, characterized in that: The bubble breaking point pressure of the inverted cone capillary pore is not less than 4×10 4 σ, σ is the surface tension of the propellant liquid.

8. The guide plate according to claim 3, characterized in that: The distance between the centers of the small holes is 0.5 mm to 1 mm.

9. The guide plate according to claim 4, characterized in that: The thickness of the groove (1b) and the porous capillary plate (1a) are both 1 mm.

10. The guide plate according to claim 1, characterized in that: The gap between the capillary porous plate (1a) and the inner wall of the storage box (4) is 2 mm to 8 mm.

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