CN111622866A

CN111622866A - Constant force spring type storage tank for liquid propellant

Info

Publication number: CN111622866A
Application number: CN202010414816.4A
Authority: CN
Inventors: 李经民; 刘冲; 马强; 余晴
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-09-04
Anticipated expiration: 2040-05-15
Also published as: CN111622866B

Abstract

The invention belongs to the technical field of liquid working medium electric propulsion systems, and provides a constant force spring type storage tank for a liquid propellant. The sealing ring and the guide ring are arranged on the piston to play a role in sealing and guiding; the push rod and the piston are connected, and under the action of the elastic force of the constant force spring, the push rod and the piston extrude liquid propellant stored in the box body into the supply pipeline. The invention can ensure the continuous and stable supply of the liquid propellant under constant pressure, has small volume, light weight and high reliability, and is suitable for the electric propulsion system of the liquid working medium.

Description

Constant force spring type storage tank for liquid propellant

Technical Field

The invention belongs to the technical field of liquid working medium electric propulsion systems, and relates to a constant force spring type storage tank for a liquid propellant, which is used for continuously and stably supplying the liquid propellant under constant pressure.

Background

The electric propulsion technology has the characteristics of high specific impulse, high control precision, long service life and the like, and has wide application prospect in tasks such as satellite attitude and orbit control, deep space exploration and the like. The stable and continuous supply of the propellant is a key technology of an electric propulsion system, and in the conventional liquid working medium electric propulsion system, high-pressure gas extrusion type supply is generally adopted. However, this supply method requires a high-pressure air source and a complete set of air pressure control device, which results in a rapid increase in the weight and volume of the propeller.

With the proposal of gravitational wave detection in various countries, micro-nano satellites become a research hotspot of aerospace technology. In the micro-nano satellite, a propeller is limited by volume and mass, and the conventional high-pressure gas extrusion type supply mode obviously cannot meet the requirement. For this reason, new propellant supply methods are being studied in various countries.

Disclosure of Invention

The invention aims to provide a constant-pressure spring type storage box for a liquid propellant, which integrates the storage and supply of the propellant, effectively reduces the volume and the mass of a propeller, solves the problem of overlarge volume and mass of the propeller caused by extrusion supply of high-pressure gas in the prior art, and further meets the application requirements of a micro-nano satellite.

The purpose of the invention is realized by the following technical scheme:

a constant force spring type storage box for liquid propellant comprises a spring support 1, a constant force spring 2, a box body 3, a piston 4, an end cover 5, a push rod 6, a guide ring 7, a sealing ring 8 and a pin shaft 9.

The box body 3 is of an upper and lower opening structure, the spring support 1 is arranged on the periphery of the bottom of the box body 3, and the center of the bottom of the box body 3 is provided with a through hole 10 which is used as a propellant filling port and an outlet; the piston 4 is arranged in the box body 3, the outer wall of the piston 4 is in contact with the inner wall of the box body 3, a guide groove and a sealing groove are formed in the outer wall of the piston 4 and used for installing a guide ring 7 and a sealing ring 8 to achieve guiding and sealing, and the piston 4 slides up and down along the inner wall of the box body 3; the end cover 5 is arranged at the top of the box body 3, the piston 4 moves in an inner space formed between the box body 3 and the end cover 5, and a closed space is formed between the bottom of the piston 4 and the box body 3 and used for storing liquid propellant; the center of the end cover 5 is provided with a through hole for installing the push rod 6; the bottom end of the push rod 6 is connected with the top of the piston 4, and the top end of the push rod passes through the end cover 5 and is positioned outside the box body 3; the constant force springs 2 are symmetrically arranged, one ends of the constant force springs 2 are connected with the push rod 6, and the other ends of the constant force springs are arranged on the spring support 1 through pin shafts 9; the constant force spring 2 is always in a stretching state and provides constant pulling force.

The materials of the box body 3, the piston 4, the guide ring 7 and the sealing ring 8 are all materials which do not react with the stored propellant.

The through hole in the center of the end cover 5 is slightly larger than the diameter of the push rod 6.

Compared with the prior art, the invention has the following beneficial effects:

(1) the invention can realize the storage and stable and continuous supply of the liquid propellant through the integral structure, and effectively ensure the reliable work of the electric propulsion system.

(2) The invention integrates the storage and supply of the liquid propellant, thereby effectively reducing the volume of the propeller.

(3) The invention uses the constant force spring as the driving source, can provide constant pressure, saves a high-pressure air source and an air pressure control device, greatly reduces the mass of the propeller, and can be applied to the microsatellite.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a constant force spring reservoir for liquid propellant.

In the figure: 1, a spring support; 2, a constant force spring; 3, a box body; 4, a piston; 5, end cover; 6, pushing a rod; 7, a guide ring; 8, sealing rings; 9, a pin shaft; 10 through holes.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Fig. 1 is a schematic structural diagram of a constant force spring type storage tank for liquid propellant provided by an embodiment of the invention. As shown in fig. 1, the constant force spring type tank for liquid propellant includes: the device comprises a spring support 1, a constant force spring 2, a box body 3, a piston 4, an end cover 5, a push rod 6, a guide ring 7, a sealing ring 8 and a pin shaft 9; the end cover 5 is arranged at the top end of the box body 3, and a through hole 10 is formed in the center of the bottom of the box body 3 and serves as a propellant filling port and an outlet; the bottom end of the push rod 6 penetrates through a through hole in the center of the end cover 5 and is connected with the upper surface of the piston 4, and the piston 4 is arranged in a non-closed space formed by the end cover 5 and the box body 3; the liquid propellant is stored in a closed space formed by the piston 4 and the box body 3; the piston 4 is provided with a guide groove and a seal groove, and a guide ring 7 and a seal ring 8 are arranged; the spring supports 1 are arranged on two sides of the bottom end of the box body 3; one end of the constant force spring 2 is connected with the push rod 6, and the other end is hung on the spring support 1 through a pin shaft 9.

In this embodiment, the material used for the case 3 and the piston 4 is stainless steel.

In this embodiment, the number of the constant force springs 2 is 4.

The propellant storage volume in the case 3 in this embodiment is 50 ml.

The specific working process of the invention is as follows:

filling stage: cleaning and drying the storage box; connecting a propellant filling device with a filling port on a storage tank, moving a piston 4 together with a push rod 6 upwards under the action of filling pressure, and lengthening a constant-force spring 2; fixing the position of the constant force spring 2; and taking down the filling device, and sealing the filling port of the storage tank to finish filling.

The working stage is as follows: the storage tank is connected into a propulsion system, the constant force spring 2 is released, and under the action of the constant force spring 2, the piston 4 and the push rod 6 are pushed to move downwards, so that the liquid propellant stored in the tank body 3 is squeezed into a supply pipeline at constant pressure.

The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.

Claims

1. The constant force spring type storage box for the liquid propellant is characterized by comprising a spring support (1), a constant force spring (2), a box body (3), a piston (4), an end cover (5), a push rod (6), a guide ring (7), a sealing ring (8) and a pin shaft (9);

the box body (3) is of an upper and lower opening structure, a spring support (1) is installed on the periphery of the bottom of the box body (3), and a through hole (10) is formed in the center of the bottom of the box body (3) and serves as a propellant filling port and an outlet; the piston (4) is arranged in the box body (3), the outer wall of the piston (4) is in contact with the inner wall of the box body (3), a guide groove and a sealing groove are formed in the outer wall of the piston (4) and used for installing a guide ring (7) and a sealing ring (8) to realize guide and sealing, and the piston (4) slides up and down along the inner wall of the box body (3); the end cover (5) is arranged at the top of the box body (3), the piston (4) moves in an inner space formed between the box body (3) and the end cover (5), and a closed space is formed between the bottom of the piston (4) and the box body (3) and used for storing liquid propellant; the center of the end cover (5) is provided with a through hole for installing the push rod (6); the bottom end of the push rod (6) is connected with the top of the piston (4), and the top end of the push rod penetrates through the end cover (5) and is positioned outside the box body (3); the constant force springs (2) are symmetrically arranged, one ends of the constant force springs (2) are connected with the push rods (6), and the other ends of the constant force springs are arranged on the spring support (1) through pin shafts (9); the constant force spring (2) is always in a stretching state and provides constant pulling force.

2. The constant force spring type storage tank for liquid propellant as claimed in claim 1, wherein the materials of the tank body (3), the piston (4), the guide ring (7) and the sealing ring (8) are all materials which do not react with the stored propellant.