Multifunctional liquid collector suitable for repeated starting of upper-stage engine

Abstract

The invention provides a multifunctional liquid collector suitable for multiple starting of an upper-stage engine. The multifunctional liquid collector comprises an upper flange, an upper anti-vortex and anti-collapse plate, a lower anti-vortex and anti-collapse plate, a conical shell and a lower flange. The upper anti-vortex and anti-collapse plate is in threaded connection with the inner side of the conical shell, and the lower anti-vortex and anti-collapse plate is welded to the inner side of the conical shell; the conical shell is of a funnel-shaped structure; the multifunctional liquid collector is installed in the center of the bottom of the storage box, the upper flange is connected with the storage box outlet flange after being welded to the upper portion of the conical shell, and the lower flange is connected with the conveying pipe after being welded to the lower portion of the conical shell. According to the multifunctional liquid collector suitable for multiple starting of the upper-stage engine, through conical outflow and the two layers of anti-vortex and anti-collapse plates, the vortex and collapse phenomena of outflow of the storage tank can be effectively avoided, the unavailable amount of propellants is reduced, and the liquid collector has a certain low-temperature propellant storage effect and is suitable for multiple starting of the engine.

Description

Technical Field

[0001] The invention relates to the technical field of liquid collectors, and in particular to a multifunctional liquid collector suitable for multiple starts of upper stage engines. Background Art

[0002] At the end of the flight of a liquid rocket, the liquid surface of the propellant outflow from the tank often swirls and collapses, causing air to be trapped in the delivery pipe; the gas enters the engine and causes the engine to malfunction. In order to prevent the air entrapment caused by swirls and liquid surface collapse at the propellant tank outlet, certain anti-rotation and anti-collapse measures must be taken at the tank outlet to reduce the unusable amount of propellant in the tank.

[0003] The upper stage is in a microgravity environment during ignition or glide phase. The propellant deviates from the tank outlet due to its own physical properties and factors such as the rocket body attitude adjustment. Before the next engine start, a certain amount of propellant is needed to cover the tank outlet, and the propellant needs to be retained and managed.

[0004] A liquid collector device is now proposed, which has anti-vortex and anti-collapse functions and can manage the retention of propellant to adapt to multiple starts of the upper stage engine. Summary of the invention

[0005] The object of the present invention is to provide a multifunctional liquid collector suitable for multiple starts of upper stage engines, so as to reduce the unusable amount of propellant caused by the collapse and vortex phenomenon of the tank outflow, while meeting the retention management of the propellant and meeting the multiple starts of the upper stage engines.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: to provide a multifunctional liquid collector adapted to multiple starts of an upper stage engine, comprising an upper flange, an upper anti-vortex and anti-collapse plate, a lower anti-vortex and anti-collapse plate, a conical shell and a lower flange;

[0007] The upper anti-vortex and anti-collapse plate is screwed to the inner side of the conical shell, and the lower anti-vortex and anti-collapse plate is welded to the inner side of the conical shell; the conical shell is a funnel-shaped structure;

[0008] The multifunctional liquid collector is installed at the bottom center of the tank, the upper flange is welded to the upper part of the conical shell and then connected to the tank outlet flange, and the lower flange is welded to the lower part of the conical shell and then connected to the delivery pipe.

[0009] Furthermore, the upper anti-vortex and anti-collapse plate is connected to a bracket welded on the inner side of the conical shell by multiple screws, and multiple annular outlets are evenly and symmetrically distributed on the circular plate near the outer side, and an intermediate baffle is used to prevent the liquid level from collapsing prematurely.

[0010] Furthermore, annular and circular small hole outlets are symmetrically distributed on both sides of the circular plate of the lower anti-vortex and anti-collapse plate to avoid liquid surface collapse and the generation of large vortices at the outlet. The outlet area gradually increases along the radial direction to ensure that the local flow velocity is not too high and to prevent the static pressure from being too low to cause cavitation of the cryogenic propellant.

[0011] Furthermore, the upper flange is connected to the bottom of the tank by bolts, and the lower flange is connected to the delivery pipe by bolts.

[0012] Furthermore, eight brackets are evenly welded on the inner side of the funnel-shaped conical shell for installing anti-vortex and anti-collapse plates.

[0013] Furthermore, the multiple annular flow outlets of the upper anti-vortex and anti-collapse plate are distributed in a centrally symmetrical manner, and the flow outlet area is 5 times the area of ​​the delivery pipe.

[0014] Furthermore, the circular holes and annular holes of the lower anti-vortex and anti-collapse plate are distributed in a centrally symmetrical manner, and the outflow area is 1.5 times the area of ​​the delivery pipe.

[0015] Furthermore, the lower anti-vortex and anti-collapse plate has 6 layers of fan-shaped flow channels with diameters of Φ72 to Φ222 symmetrically distributed around the center, with a fan angle of 50°, a total of 48 circular flow channels with diameters of Φ6, Φ10, Φ12, and Φ16, and 4 Φ222 fan-shaped flow channels, with a fan angle of 30°.

[0016] The multifunctional liquid collector provided by the present invention, which is suitable for multiple starts of the upper stage engine, can effectively avoid the vortex and collapse of the tank outflow through the conical outflow and two layers of anti-vortex and anti-collapse plates, reduce the unusable amount of propellant, and the liquid collector has a certain low-temperature propellant retention function and is suitable for multiple starts of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The invention will be further described below in conjunction with the accompanying drawings:

[0018] Figure 1 It is the installation form of the liquid collector;

[0019] Figure 2 It is a schematic diagram of the liquid collector structure;

[0020] Figure 3 It is a conical shell;

[0021] Figure 4 It is an anti-vortex and anti-collapse board;

[0022] Figure 5 It is a vortex and collapse prevention plate. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the multifunctional liquid collector for multiple starts of upper stage engines proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the accompanying drawings are in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0024] The present invention provides a multifunctional liquid collector suitable for multiple starts of an upper stage engine, which is installed at the bottom center of a tank, connected to the tank through an upper flange of the liquid collector, and connected to an engine inlet through a lower flange and a delivery pipe; the liquid collector body is a conical shell, and upper and lower anti-vortex and anti-collapse plates are installed on the inner side of the conical shell.

[0025] The upper flange is connected to the tank outlet flange after being welded to the upper part of the conical shell, and the lower flange is connected to the conveying pipe after being welded to the lower part of the conical shell.

[0026] The conical shell is a funnel-shaped structure, and the conical shell is connected to the upper and lower flanges by welding. The funnel-shaped outflow can effectively avoid the generation of vortices.

[0027] The upper anti-vortex and anti-collapse plate is connected to the bracket welded on the inner side of the conical shell by 8 screws. Four annular outlets are evenly and symmetrically distributed on the circular plate near the outer side. Since the center flow velocity is fast during the outflow process, the liquid at the edge has no time to be replenished, resulting in liquid level collapse. This distribution uses an intermediate baffle to prevent the liquid level from collapsing prematurely.

[0028] The lower anti-vortex and anti-collapse plate is directly welded to the inner side of the conical shell, and annular and circular small hole outlets are symmetrically distributed on both sides of the circular plate, which can effectively prevent the liquid level from collapsing and the generation of a large vortex at the outlet. The outlet area gradually increases along the radial direction, ensuring that the local flow velocity is not too high and the static pressure is too low to cause cavitation of the cryogenic propellant.

[0029] Example 1

[0030] This embodiment provides a multifunctional liquid collector 2 adapted to multiple starts of the upper stage engine, such as Figure 2 As shown, it includes an upper flange 4, a bracket 5, an upper anti-vortex and anti-collapse plate 6, a lower anti-vortex and anti-collapse plate 7, a conical shell 8, and a lower flange 9; the multifunctional liquid collector is installed on the bottom 1 of the storage tank and is connected to the conveying pipe 3 at the bottom. The installation diagram is shown in Figure 1 As shown; the upper flange 1 is connected to the tank bottom 1 by bolts, and the lower flange 9 is connected to the delivery pipe 3 by bolts.

[0031] like Figure 3 As shown, 8 brackets are evenly welded on the inner side of the funnel-shaped conical shell for installing the upper anti-vortex and anti-collapse plate, and the conical shell is fixedly connected to the upper and lower flanges by welding. Figure 4 , Figure 5As shown, the upper and lower anti-vortex and anti-collapse plates are respectively. The upper anti-vortex and anti-collapse plate has four annular holes symmetrically distributed in the center and eight circular holes evenly distributed in the circumference. It is used for screw connection with the conical shell, and the outflow area is 5 times the area of ​​the conveying pipe. The circular holes and annular holes of the lower anti-vortex and anti-collapse plate are symmetrically distributed in the center and are directly welded to the conical shell. The outflow area is 1.5 times the area of ​​the conveying pipe.

[0032] The functional liquid collector provided by the present invention realizes the anti-vortex and anti-collapse functions through a conical shell and two layers of anti-vortex and anti-collapse plates. It has been verified by simulation and flight tests that it has good anti-vortex and anti-collapse functions, can effectively reduce the unusable amount of cryogenic propellant, improve the propellant utilization rate, and increase the effective carrying capacity; the liquid collector cavity has a good cryogenic propellant retention effect, and meets the requirements of multiple starts of the upper stage engine.

[0033] The contents not described in detail in this specification belong to the prior art known to those skilled in the art. It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A multifunctional liquid collector adapted for multiple starts of upper stage engines, characterized in that: It includes an upper flange, an upper anti-vortex and anti-collapse plate, a lower anti-vortex and anti-collapse plate, a conical shell and a lower flange; The upper anti-vortex and anti-collapse plate is screwed to the inner side of the conical shell, and the lower anti-vortex and anti-collapse plate is welded to the inner side of the conical shell; the conical shell is a funnel-shaped structure; The multifunctional liquid collector is installed at the bottom center of the tank, the upper flange is welded to the upper part of the conical shell and then connected to the tank outlet flange, and the lower flange is welded to the lower part of the conical shell and then connected to the delivery pipe.

2. The multifunctional liquid collector adapted for multiple starts of upper stage engines as claimed in claim 1, characterized in that: The upper anti-vortex and anti-collapse plate is connected to a bracket welded on the inner side of the conical shell by multiple screws. Multiple annular outlets are evenly and symmetrically distributed on the circular plate near the outer side, and an intermediate baffle is used to prevent the liquid level from collapsing prematurely.

3. The multifunctional liquid collector adapted for multiple starts of upper stage engines as claimed in claim 1, characterized in that: Annular and circular small hole outlets are symmetrically distributed on both sides of the circular plate of the lower anti-vortex and anti-collapse plate to avoid liquid surface collapse and the generation of large vortices at the outlet. The outlet area gradually increases along the radial direction to ensure that the local flow velocity is not too high and to prevent the static pressure from being too low to cause cavitation of the cryogenic propellant.

4. The multifunctional liquid collector adapted for multiple starts of upper stage engines according to any one of claims 1 to 3, characterized in that: The upper flange is connected to the bottom of the tank by bolts, and the lower flange is connected to the delivery pipe by bolts.

5. The multifunctional liquid collector adapted for multiple starts of upper stage engines as claimed in claim 1, characterized in that: Eight brackets are evenly welded on the inner side of the funnel-shaped conical shell for installing anti-vortex and anti-collapse plates.

6. The multifunctional liquid collector adapted for multiple starts of upper stage engines as claimed in claim 1, characterized in that: The volume of the cone is greater than the amount of propellant required to restart the engine.

7. The multifunctional liquid collector adapted for multiple starts of upper stage engines as claimed in claim 2, characterized in that: The multiple annular flow outlets of the upper anti-vortex and anti-collapse plate are distributed in a centrally symmetrical manner, and the flow outlet area is 5 times the area of ​​the delivery pipe.

8. The multifunctional liquid collector adapted for multiple starts of upper stage engines as claimed in claim 3, characterized in that: The circular holes and annular holes of the lower anti-vortex and anti-collapse plate are distributed in a centrally symmetrical manner, and the outflow area is 1.5 times the area of ​​the delivery pipe.

9. The multifunctional liquid collector adapted for multiple starts of upper stage engines as claimed in claim 3, characterized in that: The lower anti-vortex and anti-collapse plate has 6 layers of fan-shaped flow channels with diameters of Φ72 to Φ222 symmetrically distributed centrally, with a fan angle of 50°, a total of 48 circular flow channels with diameters of Φ6, Φ10, Φ12, and Φ16, and 4 Φ222 fan-shaped flow channels, with a fan angle of 30°.

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