阅读说明：本技术 一种先导式电磁阀 (Pilot-operated type electromagnetic valve ) 是由 不公告发明人 于 2020-03-23 设计创作，主要内容包括：本发明公开了一种先导式电磁阀,包括电磁铁组件、衔铁、主阀阀体、端盖、主阀阀芯、导阀阀芯、导阀阀体、顶杆、接管嘴、入口、出口、弹簧、O形圈和螺钉,导阀阀体与顶杆之间设置O形圈密封,导阀阀体上有接管嘴,主阀阀芯背压腔在阀门打开状态下通过接管嘴可与外界环境连通,导阀阀体与主阀阀体之间用O形圈进行密封。本发明的技术方案,具有大通径、高工作压力、环境友好、安装方便的特点。(The invention discloses a pilot-operated electromagnetic valve which comprises an electromagnet assembly, an armature, a main valve body, an end cover, a main valve core, a pilot valve body, a push rod, a connecting nozzle, an inlet, an outlet, a spring, an O-shaped ring and a screw. The technical scheme of the invention has the characteristics of large drift diameter, high working pressure, environmental friendliness and convenience in installation.)

1. A pilot-operated electromagnetic valve is characterized by comprising an electromagnet assembly (1), an armature (2), a main valve body (3), an end cover (4), a main valve core (5), a pilot valve core (6), a pilot valve body (7), a push rod (8), a filler neck (9), an upper sealing seat (10), a lower sealing seat (11), a valve inlet (12), a valve outlet (13), springs (15, 18), O-shaped rings (14, 17, 19) and screws (16, 20), wherein the push rod (8) is in threaded connection with the armature (2), the armature (2) is installed in the electromagnet assembly (1), the pilot valve core (6) is installed in the pilot valve body (7), the pilot valve body (7) is connected with the electromagnet assembly (1) and the main valve body (3) through the screws (20), the main valve core (5) is installed in the main valve body (3), the end cover (4) is connected with the main valve body (3) through the screw (16), the end cover (4), the main valve body (3) and the main valve spool (5) are sealed through the O-shaped ring (17), the connecting nozzle (9) is arranged at the discharge port of the pilot valve body (7), and the pilot valve body (7), the ejector rod (8) and the main valve body (3) are sealed through the O-shaped rings (14 and 19).

2. A pilot operated solenoid valve according to claim 1, characterised in that the pilot valve body (7) is provided with the upper sealing seat (10), and the valve core (6) of the pilot valve form a sealing relation under the valve closing state, the valve body (3) of the main valve is provided with the lower sealing seat (11), and the pilot valve core (6) forms a sealing relation under the valve opening state, the main valve body (3) is provided with the valve inlet (12) and the valve outlet (13), the valve inlet (12) and the valve outlet (13) are vertically arranged, a back pressure cavity (21) of the main valve core (5) is communicated with the valve inlet (12) through the lower sealing seat (11) in a valve closing state, and the valve is communicated with the external environment through the upper sealing seat (10) and the filler neck (9) in an opening state.

Technical Field

The invention relates to a pilot-operated electromagnetic valve, in particular to a pilot-operated electromagnetic valve for supplying fuel in the starting process of a liquid oxygen kerosene rocket engine.

Background

In the starting process of the existing rocket engine, fuel enters a thrust chamber, and as described in a book of high-pressure afterburning liquid oxygen kerosene engine published by the national defense industry publishing agency in 2005, the author is Zhang Guitian academy, there are two general schemes:

the scheme of the two-position three-way electromagnetic valve and the pneumatic control valve is as shown in figure 1, and mainly comprises a pneumatic control valve 1, a cylinder 2, a two-position three-way electromagnetic valve 3, a gas pipeline 4, a fuel inlet 5, a fuel outlet 6, a gas inlet 7 and a gas discharge port 8: this scheme needs to set up control gas all the way, simultaneously, still needs to set up a two three solenoid valve and controls gaseous switch. When the pneumatic control valve needs to be opened, the two-position three-way electromagnetic valve is electrified to open the cylinder which leads the gas into the pneumatic control valve, the pneumatic control valve is opened along with the opening of the pneumatic control valve, the fuel enters through the inlet, when the pneumatic control valve needs to be closed, the two-position three-way electromagnetic valve is powered off to close the cylinder which leads the pneumatic control valve and discharge the gas from the discharge port, and the pneumatic control valve is closed along with the closing of the pneumatic control valve;

the one-way valve scheme, as shown in fig. 2, mainly comprises a housing 1, springs 2 and 4, a seal seat 3, a valve core 5, a discharge port 6, an outlet 7 and an inlet 8: before the engine is started, the valve core is in a closed position under the action of the forces of the springs 2 and 4, after the fuel pressure at the valve inlet is increased, the force of the fuel pressure acting on the valve core overcomes the spring force to push the valve core away from the sealing seat, and the fuel enters the thrust chamber. When the engine is shut down, the spring force will return the spool to the closed position as the inlet pressure decreases. The main drawback of this solution is that the pressure at which the non-return valve opens is constant and cannot be adjusted on site during the system commissioning phase if the parameters do not match.

Disclosure of Invention

The invention provides a pilot-operated electromagnetic valve, which is particularly used for the process that fuel enters a thrust chamber in the starting process of a liquid oxygen kerosene rocket engine and has the characteristics of large drift diameter, high pressure, environmental friendliness and convenience in installation;

in order to achieve the purpose, the invention adopts the following technical scheme:

a pilot-operated electromagnetic valve comprises an electromagnet assembly (1), an armature (2), a main valve body (3), an end cover (4), a main valve core (5), a pilot valve core (6), a pilot valve body (7), a push rod (8), a connecting pipe nozzle (9), an upper sealing seat (10), a lower sealing seat (11), a valve inlet (12), a valve outlet (13), springs (15, 18), O-shaped rings (14, 17, 19) and screws (16, 20), wherein the push rod (8) is in threaded connection with the armature (2), the armature (2) is arranged in the electromagnet assembly (1), the pilot valve core (6) is arranged in the pilot valve body (7), the pilot valve body (7) is connected with the electromagnet assembly (1) and the main valve body (3) through the screws, the main valve core (5) is arranged in the main valve body (3), and the end cover (4) is connected with the main valve body (3) through the screws, a filler neck is arranged at the discharge port of the pilot valve body (7). The pilot valve body (7), the ejector rod (8) and the main valve body (3) are sealed by O-shaped rings;

preferably, the pilot valve body (7) is provided with an upper sealing seat (10) which forms a sealing relation with the pilot valve core (6) in a valve closing state, the main valve body (3) is provided with a lower sealing seat (11) which forms a sealing relation with the pilot valve core (6) in a valve opening state, the main valve body (3) is provided with a valve inlet (12) and a valve outlet (13), and the valve inlet (12) and the valve outlet (13) are vertically arranged;

a back pressure cavity (21) of a main valve core (5) is communicated with a valve inlet (12) through a lower sealing seat (11) in a valve closing state, at the moment, fuel is filled in the back pressure cavity (21), when the valve is opened by electrifying, an armature (2) pushes a pilot valve core (6) to move downwards to be separated from an upper sealing seat (10) until the pilot valve core (6) is contacted with the lower sealing seat (11), at the moment, the main valve core (5) moves rightwards under the action of medium pressure and is opened (see figure 4), the back pressure cavity (21) is communicated with the external environment through the pilot valve core (6) (see figure 5), the upper sealing seat (10) and a nozzle (9), the fuel in the back pressure cavity is collected through the nozzle pipe (9) and discharged to the outside of a rocket engine, and pollution to the rocket engine is avoided in the fuel discharging process;

in the starting ignition process of the liquid oxygen kerosene rocket engine, when the kerosene pressure reaches a preset value, the pilot type electromagnetic valve is electrified, the valve is opened, fuel is supplied to the thrust chamber, and after the engine is started, the pilot type electromagnetic valve is powered off, and the valve is closed;

compared with the prior art, the invention has the advantages that:

the pilot electromagnetic valve is used as a fuel supply control element in the starting process of a liquid oxygen kerosene engine, meets the working conditions of large drift diameter and high working pressure, can simplify an engine system, and has important significance in improving the reliability and reducing the weight of the engine.

Drawings

FIG. 1 is a schematic diagram of a prior art pneumatic control valve and two-position three-way solenoid valve application;

FIG. 2 is a prior art check valve configuration;

FIG. 3 is a cross-sectional view of a pilot operated solenoid valve with the valve closed according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a pilot operated solenoid valve with the valve open according to an embodiment of the present invention;

FIG. 5 is a pilot valve spool configuration.

Detailed Description

The invention relates to a pilot-operated electromagnetic valve, which comprises an electromagnet assembly 1, an armature 2, a main valve body 3, an end cover 4, a main valve core 5, a pilot valve core 6, a pilot valve body 7, a mandril 8, a connecting pipe mouth 9, an upper sealing seat 10, a lower sealing seat 11, a valve inlet 12, a valve outlet 13, springs 15, 18, O-shaped rings 14, 17, 19 and screws 16, 20, wherein the mandril 8 is connected with the armature 2 through threads, the armature 2 is arranged in the electromagnet assembly 1, the pilot valve core 6 is arranged in the pilot valve body 7, the pilot valve body 7 is connected with the electromagnet assembly 1 and the main valve body 3 through screws, the main valve core 5 is arranged in the main valve body 3, and the end cover 4 is connected with the main valve body 3 through screws, a connecting nozzle 9 is arranged at the discharge port of the pilot valve body 7, and O-shaped rings 14 and 19 are used for sealing between the pilot valve body 7 and the mandril 8 as well as between the pilot valve body 7 and the main valve body 3;

the pilot valve body 7 is provided with an upper sealing seat 10 which forms a sealing relation with the pilot valve core 6 in a valve closing state, the main valve body 3 is provided with a lower sealing seat 11 which forms a sealing relation with the pilot valve core 6 in a valve opening state, the main valve body 3 is provided with a valve inlet 12 and a valve outlet 13, and the valve inlet 12 and the valve outlet 13 are vertically arranged;

the back pressure cavity 21 of the main valve core 5 is communicated with the valve inlet 12 through the lower seal seat 11 in the valve closing state, at the moment, the back pressure cavity 21 is filled with fuel, when the valve is opened by electrifying, the armature 2 pushes the pilot valve core 6 to move downwards to be separated from the upper seal seat 10 until the pilot valve core 6 is contacted with the lower seal seat 11, at the moment, the main valve core 5 moves rightwards and is opened under the action of medium pressure (see figure 4), the back pressure cavity 21 is communicated with the external environment through the pilot valve core 6 (see figure 5), the upper seal seat 10 and the nozzle 9, and the fuel in the back pressure cavity is collected and discharged out of the rocket engine through the nozzle 9, and in the fuel discharging process, the rocket engine cannot be polluted;

in the starting ignition process of the liquid oxygen kerosene rocket engine, when the pressure of the kerosene reaches a preset value, the pilot type electromagnetic valve is opened to supply the kerosene to the thrust chamber;

the working principle is as follows: as shown in fig. 3, the valve is in a closed state, that is, the main valve spool 5 contacts and seals with the main valve body 3, at this time, the pilot valve spool 6 contacts and seals with the upper sealing seat 10, the lower sealing seat 11 is opened, the main valve spool 5 backpressure cavity 21 is communicated with the valve inlet, the valve outlet is in a high pressure state, the valve outlet is in a low pressure state, and the main valve spool 5 is in a closed state under the action of medium force and spring force;

when the main valve core 5 needs to be opened, the electromagnet assembly 1 is electrified, at the moment, the armature 2 is under the action of electromagnetic force and moves downwards to drive the ejector rod 8 to push the pilot valve core 6, so that the pilot valve core 6 moves downwards to be separated from the upper sealing seat 10 until the pilot valve core 6 is contacted with the lower sealing seat 11 and sealed, the lower sealing seat 11 is closed, and the upper sealing seat 10 is opened. As shown in fig. 4, the back pressure chamber 21 of the main valve spool 5 is connected to the external environment through the filler neck 9 and is in a low pressure state, and the main valve spool 5 moves to the right against the spring force under the action of the inlet medium force and maintains the open state. The pilot valve body 7, the ejector rod 8 and the main valve body 3 are sealed by O-shaped rings, and when the valve core 5 of the main valve is opened rightwards, the medium in the back pressure cavity 21 is extruded out and discharged through the filler neck 9, and can be connected with a pipeline at the filler neck 9 for collection and discharge;

the above description is only a specific embodiment of the present invention, but the protection of the present invention is not limited thereto, and any modification without substantial change made by those skilled in the art without changing the principle should also be regarded as the protection scope of the present invention;

those skilled in the art will appreciate that the invention may be practiced without these specific details.