CN111622866A - Constant force spring type storage tank for liquid propellant - Google Patents

Abstract

The invention belongs to the technical field of liquid working fluid electric propulsion systems, and provides a liquid propellant constant force spring type storage tank, comprising a box body, a spring support, a constant force spring, a push rod, a piston, a pin shaft, a sealing ring and a guide ring. The sealing ring and guide ring are installed on the piston, which play the role of sealing and guiding; the push rod and the piston are connected, and under the elastic force of the constant force spring, the push rod and the piston squeeze the liquid propellant stored in the box into the supply pipe road. 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

A liquid propellant constant force spring tank

technical field

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

Background technique

Electric propulsion technology has the characteristics of high specific impulse, high control accuracy and long life, and has broad application prospects in missions such as satellite attitude and orbit control and deep space exploration. The stable and continuous supply of propellant is the key technology of electric propulsion system. In the previous liquid working medium electric propulsion system, high-pressure gas extrusion supply is usually used. However, this supply method needs to carry a high-pressure air source and a complete set of air pressure control devices, which will cause a sharp increase in the weight and volume of the propeller.

With the introduction of gravitational wave detection in various countries, micro-nano satellites have become a research hotspot in aerospace technology. On micro-nano satellites, the thruster is limited by volume and mass, and the previous high-pressure gas extrusion supply method obviously cannot meet the requirements. To this end, countries are studying new ways of propellant supply.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a liquid propellant constant pressure spring type storage tank, which integrates the storage and supply of the propellant, effectively reduces the volume and mass of the propeller, and solves the problems caused by the extrusion type supply of high pressure gas in the past. The volume and mass of the thruster are too large, so as to meet the application requirements of micro-nano satellites.

The object of the present invention is achieved through the following technical solutions:

A liquid propellant constant force spring type storage tank, 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 has 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 opened in the center of the bottom of the box body 3 as a propellant filling port and an outlet; the piston 4 Installed in the box 3, the outer wall of the piston 4 is in contact with the inner wall of the box 3, and the outer wall of the piston 4 is provided with a guide groove and a sealing groove, which are used to install the guide ring 7 and the sealing ring 8 to achieve guidance and sealing, The piston 4 slides up and down along the inner wall of the box body 3; the end cover 5 is installed on the top of the box body 3, the piston 4 moves in the inner space formed between the box body 3 and the end cover 5, and the bottom of the piston 4 is connected to the box body 3. A closed space is formed between them 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 its top end passes through The end cover 5 is located outside the box body 3; the constant force springs 2 are multiple and installed symmetrically, one end of the constant force spring 2 is connected with the push rod 6, and the other end is installed on the spring support 1 through the pin 9 ; Constant force spring 2 is always in tension, providing constant tension.

The materials of the box body 3 , the piston 4 , the guide ring 7 and the sealing ring 8 are all materials that do not chemically 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 present invention has the following beneficial effects:

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

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

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

Description of drawings

Figure 1 is a schematic diagram of an embodiment of a liquid propellant constant force spring tank.

In the picture: 1 spring support; 2 constant force spring; 3 box body; 4 piston; 5 end cover; 6 push rod; 7 guide ring; 8 seal ring; 9 pin shaft; 10 through hole.

Detailed ways

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 by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

FIG. 1 is a schematic structural diagram of a liquid propellant constant-force spring-type storage tank provided by an embodiment of the present invention. As shown in Figure 1, the liquid propellant constant force spring tank includes: spring support 1, constant force spring 2, box 3, piston 4, end cover 5, push rod 6, guide ring 7, sealing ring 8 And the pin 9; wherein, the end cover 5 is installed on the top of the box body 3, and the center of the bottom of the box body 3 has a through hole 10 as a propellant filling port and an outlet; the bottom end of the push rod 6 passes through the center of the end cover 5 The through hole is connected with the upper surface of the piston 4, and the piston 4 is placed in the non-closed space formed by the end cover 5 and the box body 3; the liquid propellant is stored in the closed space formed by the piston 4 and the box body 3; There are guide grooves and sealing grooves, and the guide ring 7 and the sealing ring 8 are installed; the spring support 1 is installed on both 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 passes through the pin 9 Hang on the spring support 1.

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

In this embodiment, there are four constant force springs 2 .

In this embodiment, the propellant storage volume in the box 3 is 50ml.

The concrete working process of the present invention is:

Filling stage: clean and dry the tank; connect the propellant filling device to the filling port on the tank, under the action of filling pressure, the piston 4 moves up together with the push rod 6, and the constant force spring 2 is elongated; the position of the constant force spring 2 is fixed; the filling device is removed, the filling port of the tank is sealed, and the filling is completed.

Working stage: The storage tank is connected to the propulsion system, and the constant force spring 2 is released. Under the action of the constant force spring 2, the piston 4 and the push rod 6 are pushed down, and the liquid propellant stored in the tank body 3 is kept at a constant pressure. Squeeze into the supply line.

The above-mentioned embodiments are only preferred specific embodiments of the present invention, and general changes and substitutions within the scope of the technical solutions of the present invention by those skilled in the art should be included within the protection scope of the present invention.

Claims (2)

1. A liquid propellant constant force spring type storage tank is characterized in that, described liquid propellant constant force spring type storage tank comprises spring support (1), constant force spring (2), box body (3) , piston (4), end cover (5), push rod (6), guide ring (7), sealing ring (8) and pin (9); The box body (3) has 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 opened in the center of the bottom of the box body (3), which is used as a propellant. Nozzle and outlet; the piston (4) is installed in the box (3), the outer wall of the piston (4) is in contact with the inner wall of the box (3), and the outer wall of the piston (4) is provided with a guide groove and sealing groove for installing the guide ring (7) and the sealing ring (8) to realize guiding and sealing, the piston (4) slides up and down along the inner wall of the box body (3); the end cover (5) is installed on the box body At the top of (3), the piston (4) moves in the inner space formed between the box (3) and the end cover (5), and a closed space is formed between the bottom of the piston (4) and the box (3) for The liquid propellant is stored; 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 its top end passes through The end cover (5) is located outside the box body (3); the constant force springs (2) are multiple and symmetrically installed, one end of the constant force spring (2) is connected with the push rod (6), and the other end passes through the The pin shaft (9) is mounted on the spring support (1); the constant force spring (2) is always in a stretched state, providing a constant pulling force. 2. A liquid propellant constant force spring-type storage tank according to claim 1, characterized in that the tank (3), the piston (4), the guide ring (7) and the sealing ring (8) have Materials are materials that do not chemically react with stored propellants.

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