CN-121993320-A - Decompression control method and system for rocket storage tank pressure safety system

CN121993320ACN 121993320 ACN121993320 ACN 121993320ACN-121993320-A

Abstract

The invention provides a decompression control method and system of a rocket storage tank pressure safety system, wherein the rocket storage tank pressure safety system comprises a first decompression branch and a second decompression branch, the method comprises the steps of obtaining a first pressure value of a storage tank, determining an overpressure state of the storage tank according to the first pressure value, switching to the first decompression branch to decompress according to the overpressure state of the storage tank, obtaining a second pressure value after the first decompression branch is decompressed for a first preset time period, controlling a second three-way switching valve to switch to the second decompression branch to decompress according to the second pressure value and the first pressure value, obtaining a third pressure value after the second decompression branch is decompressed for a second preset time period, controlling a second three-way switching valve to switch to a rupture disc according to the third pressure value, the first pressure value and a burst trigger threshold of the rupture disc, and releasing pressure by the rupture disc. The invention improves the stability and the universality of pressure control through flexible regulation and control of the redundant safety valve.

Inventors

TANG RUI
ZHENG SHANKUI
WANG GUANGCAI
HE QINGSONG
GUAN JIANGTAO
Jiao Chufan
WANG XINLEI
LIU YANG

Assignees

河南航宇火箭有限公司

Dates

Publication Date: 20260508
Application Date: 20260228

Claims (10)

1. A pressure reducing control method of a rocket tank pressure safety system is characterized in that the rocket tank pressure safety system comprises a tank (10), a pressure sensor connected with a first exhaust port of the tank (10), a first three-way switching valve (2 a) communicated with a second exhaust port of the tank (10), the first exhaust port and the second exhaust port are the same in vertical height relative to a horizontal line, a second three-way switching valve (2 b) communicated with the first three-way switching valve (2 a), a rupture disk (1) communicated with the first three-way switching valve (2 a), a first pressure relief branch communicated with the first three-way switching valve (2 a), and a second pressure relief branch communicated with the first three-way switching valve (2 a), and the method comprises the following steps of: Acquiring a first pressure value of a first exhaust port of the storage tank (10) through the pressure sensor; Determining an overpressure condition of the tank (10) as a function of the first pressure value; according to the overpressure state of the storage tank (10), the pressure is released by switching to a first pressure release branch through the first three-way switching valve (2 a); acquiring a second pressure value after the first pressure relief branch is subjected to pressure relief for a first preset time period through the pressure sensor; According to the second pressure value and the first pressure value, controlling the first three-way switching valve (2 a) to switch to a second three-way switching valve (2 b), and controlling the second three-way switching valve (2 b) to switch to a second pressure relief branch for pressure relief; acquiring a third pressure value after the second pressure relief branch is subjected to pressure relief for a second preset time period through the pressure sensor; And controlling the second three-way switching valve (2 b) to switch to the rupture disk (1) according to the third pressure value, the first pressure value and the explosion triggering threshold value of the rupture disk (1), and automatically breaking the rupture disk (1) to release pressure.
2. A method of controlling the depressurization of a rocket tank pressure safety system according to claim 1, characterized in that determining the overpressure condition of the tank (10) from said first pressure value comprises: Determining that the storage tank (10) is in a non-overpressure state according to the first pressure value, a preset overpressure trigger threshold value and a pressure return difference; When the storage box (10) is determined to be in an overpressure state according to a plurality of first pressure values and preset overpressure trigger thresholds which are continuously collected, the storage box (10) is determined to be in a first overpressure state according to the first pressure values, the preset overpressure trigger thresholds and the first overpressure trigger thresholds which are currently collected, the first overpressure trigger threshold is larger than the preset overpressure threshold, the storage box (10) is determined to be in a second overpressure state according to the first pressure values, the first overpressure trigger thresholds and the second overpressure trigger thresholds, the second overpressure trigger threshold is larger than the first overpressure trigger threshold, the storage box (10) is determined to be in a third overpressure state according to the first pressure values and the second overpressure trigger thresholds, and the second overpressure trigger threshold is larger than the first overpressure trigger threshold.
3. A method of controlling the depressurization of a rocket tank pressure safety system according to claim 2, wherein determining that the tank (10) is in an overpressure condition based on a plurality of first pressure values collected continuously and a preset overpressure trigger threshold value comprises: According to Determining that the storage tank (10) is in an overpressure state; wherein k is the number of a plurality of first pressure values which are continuously acquired, The indication function is represented by a representation of the indication function, Indicating a preset overpressure trigger threshold, And the ith first pressure value is represented, and N is the number of the first pressure values which are larger than a preset overpressure trigger threshold.
4. A rocket tank pressure safety system depressurization control method according to claim 2 or 3, characterized by switching to a first depressurization branch for depressurization by the first three-way switching valve (2 a), comprising: If the overpressure state is a first overpressure state, switching to a first pressure relief branch for pressure relief through the first three-way switching valve (2 a), and opening a first electromagnetic isolation valve (3 a) and a first safety valve (4 a) of the first pressure relief branch for pressure relief of a first preset flow; If the overpressure state is the second overpressure state, the first pressure relief branch is switched to be subjected to pressure relief through the first three-way switching valve (2 a), and the first electromagnetic isolation valve (3 a) and the first safety valve (4 a) of the first pressure relief branch are opened to carry out pressure relief of a second preset flow.
5. A rocket tank pressure safety system depressurization control method according to claim 4 wherein said first predetermined flow pressure relief is in accordance with Determining; Wherein, the , ; Wherein, the Indicating the pressure relief of the first preset flow, For a desired minimum pressure relief mass flow rate, In order to control the desired pressure relief flow, In order to achieve a maximum thermal load, To provide a constant pressure specific heat for the gas in the storage tank (10), For the approximate temperature drop in the pressure relief process, For the gas phase volume of the storage tank (10), The molecular weight of the gas is the molecular weight of the gas, Is a gas constant which is a general purpose gas constant, Is the compression factor of the gas and, For the design temperature of the gas in the tank (10), For the pressure classification interval, For the maximum allowable settling time, Is a safety coefficient; the pressure relief according to the second preset flow Determining; Wherein, the As a flow rate amplification factor, Indicating the second preset flow pressure relief.
6. A rocket tank pressure safety system depressurization control method according to claim 1 and further comprising: According to And is also provided with Determining whether a first electromagnetic isolation valve (3 a) of the first pressure relief branch or a second electromagnetic isolation valve (3 b) of the second pressure relief branch is faulty; Wherein, the For the current moment of time, To the moment when the closing or opening command is issued to the electromagnetic isolation valve, =2s, And the position signal of the electromagnetic isolation valve is fed back by a position sensor built in the electromagnetic isolation valve, and the position signal represents the valve opening and closing degree of the electromagnetic isolation valve.
7. A rocket tank pressure safety system depressurization control method according to claim 6 and further comprising: if the first electromagnetic isolation valve (3 a) has isolation faults, the second three-way switching valve (2 b) is controlled to open the second electromagnetic isolation valve (3 b) and the second safety valve (4 b) on the second pressure relief branch to relieve pressure, the first electromagnetic isolation valve (3 a) and the first safety valve (4 a) on the first pressure relief branch are closed, and the valve opening of the second safety valve (4 b) is adjusted; and if isolation faults occur in the first electromagnetic isolation valve (3 a) and the second electromagnetic isolation valve (3 b), triggering the rupture disc (1) to release pressure.
8. A rocket tank pressure safety system depressurization control method according to claim 6 and further comprising: According to Early warning the failure probability of the valve; Wherein, the As a probability of failure of the valve, For the number of valve actions, For the number of valve-limit actions, For the average response time of the valve action, Is the standard response time for the valve action, The valve comprises a first electromagnetic isolation valve (3 a) and any one of a first safety valve (4 a), a second electromagnetic isolation valve (3 b) and a second safety valve (4 b).
9. A rocket tank pressure safety control system, comprising: A pressure sensor connected to the tank (10); A first pressure relief branch connected to the tank (10); a second pressure relief branch connected to the tank (10); a rupture disk (1) connected to the reservoir (10); The first pressure relief branch is sequentially provided with a first three-way switching valve (2 a), a first electromagnetic isolation valve (3 a) and a first safety valve (4 a); A second three-way switching valve (2 b), a second electromagnetic isolation valve (3 b) and a second safety valve (4 b) are sequentially arranged on the second pressure relief branch; The device comprises a pressure sensor, a controller, a first three-way switching valve (2 a), a second pressure value, a third pressure value, a rupture disc (1) and an automatic rupture disc (1), wherein the pressure sensor is connected with the pressure sensor, the first pressure value of a first exhaust port of the storage tank (10) is obtained through the pressure sensor, the overpressure state of the storage tank (10) is determined according to the first pressure value, the pressure is released by switching the first three-way switching valve (2 a) to the first pressure release branch according to the overpressure state of the storage tank (10), the second pressure value after the first pressure release branch is obtained through the pressure sensor for a first preset time period is obtained, the first three-way switching valve (2 a) is controlled to be switched to the second three-way switching valve (2 b) according to the second pressure value and the first pressure value, the rupture disc (1) is controlled to be switched to the second three-way switching valve (2 b) according to the second pressure value and the first pressure value and the rupture disc (1) is controlled to be automatically released by triggering the rupture disc (1).
10. A rocket tank pressure safety control system according to claim 9, wherein the first three-way switching valve or the second three-way switching valve each comprises: a movable spool; a first plug (7 a) and a second plug (7 b) which are nested on the movable valve core and are opposite to each other in the axial direction; the sealing ring (6) is arranged at the middle position of the movable valve core and the valve body and is arranged along the directions of the first plug (7 a) and the second plug (7 b); an inlet (8) for gas in a tank (10) provided on one side of the movable spool; A first outlet (9 a) and a second outlet (9 b) arranged on the other side of the movable valve core; an inlet (10) for control gas provided in the direction of movement of the movable spool; When the control gas is not acted, the movable valve core is at an initial position, the second plug (7 b) closes the gas path of the second outlet (9 b), the inlet (8) is communicated with the first outlet (9 a), and the gas in the storage tank (10) flows from the inlet (8) to the first outlet (9 a); When the control gas is introduced, the control gas pushes the valve core to move, the first plug (7 a) closes the gas path of the first outlet (9 a), the inlet (8) is communicated with the second outlet (9 b), and the gas in the storage tank (10) flows from the inlet (8) to the second outlet (9 b) to realize branch switching pressure relief.

Description

Decompression control method and system for rocket storage tank pressure safety system Technical Field The invention relates to the technical field of rocket tank pressure control, in particular to a decompression control method and system of a rocket tank pressure safety system. Background At present, aiming at the problem of overpressure of a system in the field of rocket booster transportation, a single safety valve or a rupture disk is mainly adopted as a core protection means. The single safety valve scheme is that a single safety valve is directly connected between an exhaust port of a storage tank and a discharge pipeline, when the pressure of the storage tank reaches the opening pressure set by the safety valve, the valve is automatically opened for pressure relief, and the valve is closed after the pressure is restored. The rupture disc scheme adopts a metal sheet with specific rated rupture pressure, and the sheet is ruptured to realize emergency pressure relief when the system pressure exceeds the rated pressure of the rupture disc in the pressure relief channel in series or parallel. The core principle of the schemes is that the pressure relief protection during overpressure is realized through passive response or simple parallel arrangement of a mechanical structure, the structure is relatively simple, the protection function is finished mainly by depending on the mechanical property of a valve or a rupture disk, a single-point fault risk exists in the single-safety valve scheme, once the valve is stuck, is invalid or leaks, the system thoroughly loses the overpressure protection capability, directly causes safety accidents such as overpressure of a storage tank, leakage of a propellant and the like, the safety valve is difficult to quickly position and isolate after being invalid, effective fault diagnosis and risk identification cannot be realized, and the fault recovery and the problem investigation are not facilitated. The valve body, the pipeline and the fluid are easy to generate fluid-solid coupling vibration, factors such as flight vibration can further influence pressure control precision, an adjustable interval is narrow, the valve is not flexible to cooperate, fault isolation is insufficient, and potential safety hazards exist. Disclosure of Invention The invention aims to solve the technical problem of providing a decompression control method and a decompression control system for a rocket storage tank pressure safety system, which eliminate single-point fault hidden danger, ensure that the system can still maintain a decompression function when a single valve body fails, and improve the safety and the success rate of a launching task under extreme working conditions. In order to solve the technical problems, the technical scheme of the invention is as follows: A decompression control method of a rocket tank pressure safety system comprises a tank, a pressure sensor, a first three-way switching valve, a second three-way switching valve, a rupture disk, a first decompression branch, a second decompression branch and a third decompression branch, wherein the pressure sensor is connected with a first exhaust port of the tank; The method includes obtaining a first pressure value of a first exhaust port of the tank via the pressure sensor; determining an overpressure condition of the tank based on the first pressure value; According to the overpressure state of the storage tank, switching to a first pressure relief branch through the first three-way switching valve to relieve pressure; acquiring a second pressure value after the first pressure relief branch is subjected to pressure relief for a first preset time period through the pressure sensor; According to the second pressure value and the first pressure value, controlling the first three-way switching valve to switch to a second three-way switching valve, and controlling the second three-way switching valve to switch to a second pressure relief branch for pressure relief; acquiring a third pressure value after the second pressure relief branch is subjected to pressure relief for a second preset time period through the pressure sensor; And controlling the second three-way switching valve to switch to the rupture disk according to the third pressure value, the first pressure value and the explosion triggering threshold of the rupture disk, and automatically breaking the rupture disk to release pressure. Optionally, determining an overpressure condition of the tank from the first pressure value comprises: Determining that the storage tank is in a non-overpressure state according to the first pressure value, a preset overpressure trigger threshold value and a pressure return difference; When the storage box is determined to be in an overpressure state according to a plurality of first pressure values and a preset overpressure trigger threshold which are continuously collected, the storage box is determined to be in a first overpressure