阅读说明：本技术 一种针阀式流量可调燃气发生器地面试验装置 (Needle valve type flow-adjustable gas generator ground test device ) 是由 李军伟 田忠亮 占干 李春杰 于 2021-08-10 设计创作，主要内容包括：本发明涉及一种针阀式流量可调燃气发生器地面试验装置,属于针阀式流量调节地面试验领域。本发明的一种针阀式流量可调燃气发生器地面试验装置,步进电机带动直线位移装置推动移动三角盘共同运动,所述针阀设置于所述喉衬的扩张段,所述喉衬与所述针阀相互配合,调节所述燃气发生器的喷射流量。本发明在进行调节的过程中,可以实现几种不同运动速度、不同移动位移任意组合,达到所需的实验目的；针阀位于喉衬的扩张段,处于燃气的逆流方向,使得本实验装置的密封更为简单；本发明使用三个电机均布的方式共同驱动运动部分,使用三个电机可以减小整个装置的空间占有率,运动过程中更稳定。(The invention relates to a needle valve type flow adjustable gas generator ground test device, and belongs to the field of needle valve type flow adjustable ground tests. According to the needle valve type flow-adjustable gas generator ground test device, the stepping motor drives the linear displacement device to push the movable triangular disc to move together, the needle valve is arranged on the expansion section of the throat liner, and the throat liner and the needle valve are matched with each other to adjust the jet flow of the gas generator. In the adjusting process, the invention can realize the random combination of several different movement speeds and different movement displacements, thereby achieving the required experiment purpose; the needle valve is positioned at the expansion section of the throat liner and is positioned in the countercurrent direction of fuel gas, so that the experimental device is simpler to seal; the invention uses the mode of uniformly distributing the three motors to drive the moving part together, and the three motors can reduce the space occupancy of the whole device and are more stable in the moving process.)

1. The utility model provides a needle valve formula flow adjustable gas generator ground test device which characterized in that: comprises a fuel gas generator and a driving mechanism which are connected through a connecting flange; the fuel gas generator comprises a rear end cover and a throat liner which are arranged at the injection end; the driving mechanism comprises a moving part and a fixing part, the moving part comprises an outer end cover, a movable triangular disc, a needle valve and an O-shaped sealing ring, the outer end cover and the needle valve are connected to the movable triangular disc, and the linear displacement device is driven by a stepping motor to push the movable triangular disc to move together; the fixed part comprises a bakelite lining layer, a stay wire displacement sensor and a large cavity flange, and the linear displacement device and the bearing sleeve are fixed at one end of the large cavity flange through screws; the other end of the large cavity flange is connected with a connecting flange, and finally the whole driving mechanism is connected to the fuel gas generator through the connecting flange to form a fuel gas generator with adjustable flow; the needle valve is arranged on the expansion section of the throat liner, and the throat liner and the needle valve are matched with each other to adjust the jet flow of the gas generator.

2. The needle valve flow regulated gasifier ground test apparatus as set forth in claim 1, wherein: the rear end cover is provided with a groove to realize dynamic sealing.

3. The needle valve flow regulated gasifier ground test apparatus as set forth in claim 1, wherein: the driving mechanism comprises three linear displacement devices which are uniformly distributed to jointly push the moving part.

4. The needle valve flow regulated gasifier ground test apparatus as set forth in claim 1, wherein: the needle valve adopts a front end cylindrical and rear end triangular structure.

5. The needle valve flow regulated gasifier ground test apparatus as set forth in claim 1, wherein: the outer end cover and the rear end cover are matched with each other to form a guide structure, and the needle valve is guaranteed to move on a horizontal axis all the time.

6. The needle valve flow regulated gasifier ground test apparatus as set forth in claim 1, wherein: the fixed part also comprises a long tail pipe which is arranged on the movable triangular disc and is used for gas flow to pass through.

7. The needle valve flow regulated gasifier ground test apparatus as claimed in claim 6, wherein: the moving part also comprises a bearing and a bearing sleeve which are arranged on the long tail pipe, the bearing is arranged between the bearing sleeve and the long tail pipe, and the bearing can prevent the moving part from being blocked in the moving process.

8. The needle valve flow regulated gasifier ground test apparatus as set forth in claim 1, wherein: the outer profile of the needle valve and the inner profile of the throat liner can be switched at will.

Technical Field

The invention relates to a needle valve type flow adjustable gas generator ground test device, and belongs to the field of needle valve type flow adjustable ground tests.

Background

The solid rocket engine has a simple structure, but has poor controllability, and the propellant charges can be combusted according to a preset rule once being ignited. The solid rocket engine can not be controlled in the working process, can not adjust the thrust in the working process, and can not be stopped or started for multiple times at will, so that the application and development of the solid rocket engine are greatly limited. However, the solid rocket engine has a simple structure and still becomes the first choice of a power device on a plurality of weapon missiles. The variable thrust solid rocket engine is a hot problem in engine development, and among a plurality of methods for changing thrust, a method for changing equivalent throat area by using needle valve adjustment to further change flow is one of simple and effective methods.

At present, the variable flow regulation technology of the solid rocket engine is realized by changing the equivalent throat area through the movement of a regulating device. The needle valve type variable throat surface adjustment has the advantages of continuous adjustment, large adjustment range, ablation compensation and the like, but the gas flow adjusting valve needs to work in high-temperature and high-pressure gas for a long time, so that the system design faces the problems of material ablation, driving sealing, laryngeal plug deposition and the like. Beginning in the seventies of the twentieth century, a great deal of theoretical and experimental research is carried out abroad aiming at variable-thrust solid rocket engines, but the development is slow due to the practical conditions of sealing, material ablation and the like. In the eighty-ninety years, with the development of technologies such as materials, sealing, simulation calculation software and the like, the research on the variable-thrust solid rocket engine has advanced to a certain extent. AMCOM and CFD research corporation (CFDRC) collaborate to develop a laryngeal suppository engine correlation analysis test system, and the analysis test system is designed around the problems of material selection, performance prediction, engine control system and the like. In recent years, a great deal of research is conducted on the aspects of principle analysis, system design, numerical simulation, tests and the like of a gas flow regulation system in units such as a domestic related unit space power technology research institute, a third research institute of a space science and technology group, a national defense science and technology university, a Beijing science and technology university and the like. However, due to the limitation of materials and experimental means, the variable thrust solid rocket engine has the following problems: 1) the valve body is in high-temperature and high-pressure gas flow, and the valve body and the spray pipe are seriously ablated; 2) the needle valve is mostly positioned at the contraction section of the spray pipe, and the sealing of the engine is relatively difficult; 3) part of the engine needle valve driving system adopts an auxiliary hydraulic driving mode, the structure is complex, the structure is greatly simplified by adopting an electronic mechanical driving mode, and the passive mass is correspondingly reduced.

Disclosure of Invention

In order to solve the problems of difficult sealing, complex structure, difficult integration and the like of the existing needle valve type flow adjustable gas generator, the invention discloses a needle valve type flow adjustable gas generator ground test device which aims to solve the technical problem of realizing the needle valve type flow adjustable gas generator ground test and has the following advantages: (1) the needle valve is positioned at the expansion section of the spray pipe, so that the sealing is easy; (2) three motors are selected for driving, so that the driving is stable, the space occupancy rate of the device is reduced, the structure is symmetrical, and the layout is convenient; (3) simple structure and repeated use.

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

The invention discloses a needle valve type flow adjustable gas generator ground test device, which comprises a gas generator and a driving mechanism, wherein the gas generator and the driving mechanism are connected through a connecting flange; the fuel gas generator comprises a rear end cover and a throat liner which are arranged at the injection end; the driving mechanism comprises a moving part and a fixing part, the moving part comprises an outer end cover, a movable triangular disc, a needle valve and an O-shaped sealing ring, the outer end cover and the needle valve are connected onto the movable triangular disc, the three linear displacement devices are connected onto a large cavity flange through 12 bolts, and the moving part drives the linear displacement devices to push the movable triangular disc to move together by a stepping motor; the fixed part comprises a bakelite lining layer, a stay wire displacement sensor and a large cavity flange, and the linear displacement device and the bearing sleeve are fixed at one end of the large cavity flange through screws; the other end of the large cavity flange is connected with a connecting flange, and finally the whole driving mechanism is connected to the fuel gas generator through the connecting flange to form a fuel gas generator with adjustable flow; the needle valve is arranged on the expansion section of the throat liner, and the throat liner and the needle valve are matched with each other to adjust the jet flow of the gas generator.

Preferably, the rear end cover is provided with a groove to realize dynamic sealing.

Preferably, the driving mechanism comprises three linear displacement devices, and the three linear displacement devices are uniformly distributed to jointly push the moving part.

Preferably, the needle valve adopts a front end cylindrical rear end triangular configuration.

Preferably, the outer end cover and the rear end cover are matched with each other to form a guide structure, so that the needle valve is guaranteed to move on a horizontal axis all the time.

Preferably, the stationary part further comprises a long tail pipe provided on the moving triangular plate for gas flow therethrough.

Preferably, the moving part further comprises a bearing and a bearing sleeve which are arranged on the long tail pipe, the bearing is arranged between the bearing sleeve and the long tail pipe, and the bearing can prevent the moving part from being blocked in the moving process.

Has the advantages that:

1. compared with other adjusting devices, the needle valve type flow-adjustable gas generator ground test device has the advantages that the moving speed of a driving motor of the device can reach 100mm/s, and the maximum displacement can reach 40 mm; in the process of adjustment, the device can realize the random combination of several different movement speeds and different movement displacements, thereby achieving the purpose of required experiments.

2. The invention discloses a needle valve type flow adjustable gas generator ground test device, compared with other needle valve type flow adjusting devices, a needle valve of the device is positioned at a throat liner expanding section and is positioned in the counter flow direction of gas; although a larger motor drive is required, the device is simpler to seal than in the pinch section.

3. The invention discloses a needle valve type flow-adjustable gas generator ground test device.A guide structure is formed by matching an outer end cover of a moving part of a driving device with a rear end cover of a gas generator, so that a needle valve is ensured to be aligned with the axis of a throat liner in the moving process.

4. The invention discloses a needle valve type flow adjustable gas generator ground test device, which uses a mode of uniformly distributing three motors to drive a moving part together, and compared with a mode of driving by one motor, the driving force of each motor can be reduced by the combined action of the three motors; three motors are convenient for carry out ascending arranging in week, compare in a motor simultaneously, use three motor to reduce the space occupation rate of whole device, and the motion in-process is more stable.

5. The invention discloses a needle valve type flow adjustable gas generator ground test device, wherein a bearing is arranged at the outer end of a long tail pipe of a driving part of the device, so that the phenomenon of blocking of a moving part in the moving process can be effectively prevented.

Drawings

The invention is further illustrated with reference to the following figures and examples:

FIG. 1 is a schematic diagram of the internal structure of a needle valve type flow adjustable gasifier ground test apparatus of the present invention;

FIG. 2 is a schematic side view of a needle valve type flow adjustable gasifier ground test apparatus of the present invention;

FIG. 3 is a schematic view of a large cavity flange of the needle valve type flow adjustable gasifier ground test apparatus of the present invention;

FIG. 4 is a schematic view of a moving triangular plate of the needle valve type flow adjustable gasifier ground test apparatus of the present invention;

FIG. 5 is a software operating interface of the needle valve type flow adjustable gasifier ground test apparatus of the present invention.

In the figure: 1-a gas generator; 1.1-front end cap; 1.2-shell; 1.3-cushion block; 1.4-O type sealing ring; 1.5-a propellant charge; 1.6-safety blasting device base; 1.7-safety blasting plug; 1.8-safety blasting cap; 1.9-ignition adapter; 1.10-medicine baffle plate; 1.11-insulating layer; 1.12-red copper gasket; 1.13-throat liner bobbin; 1.14-throat liner; 1.15-rear end cap; 2-a drive device; 2.1-connecting flange; 2.2-large cavity flange; 2.3-pull wire sensor; 2.4-bakelite lining; 2.5-outer end cover; 2.6-O-shaped sealing rings; 2.7-needle valve; 2.8-moving the triangular plate; 2.9-graphite gaskets; 2.10-bearing cap; 2.11-bearings; 2.12-long tail tube; 2.13-linear displacement device.

Detailed Description

For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The ground test device for the needle valve type flow-adjustable gas generator disclosed by the embodiment comprises a gas generator 1 and a driving device 2. The fuel gas generator 1 comprises a front end cover 1.1, a shell 1.2, a cushion block 1.3, an O-shaped sealing ring 1.4, a propellant charge 1.5, a safety blasting device base 1.6, a safety blasting plug 1.7, a safety blasting cover 1.8, an ignition adapter 1.9, a medicine baffle plate 1.10, a heat insulating layer 1.11, a red copper gasket 1.12, a throat liner cylinder 1.13, a throat liner 1.14 and a rear end cover 1.15. The driving device 2 comprises a connecting flange 2.1, a large cavity flange 2.2, a stay wire sensor 2.3, a bakelite lining layer 2.4, an outer end cover 2.5, an O-shaped sealing ring 2.6, a needle valve 2.7, a movable triangular disc 2.8, a graphite gasket 2.9, a bearing cover 2.10, a bearing 2.11, a long tail pipe 2.12 and a linear displacement device 2.13.

The drive means 2 is divided into a moving part and a stationary part. The moving part comprises an outer end cover 2.5, an O-shaped sealing ring 2.6, a needle valve 2.7, a movable triangular disc 2.8, a graphite gasket 2.9, a bearing 2.11 and a long tail pipe 2.12.

The large cavity flange 2.2 is provided with four through holes, wherein 2.2.1 are three M6 thread through holes, and the bearing cover is fixed on the large cavity flange 2.2 through 2.2.1; 2.2.2 are three positioning threaded holes of M6, and are connected with 2.8.3 on the moving disc 2.8, the moving disc 2.8 is firstly fixed on the large-cavity flange 2.2 in the installation process, and finally the moving disc is taken down after assembly; 2.2.3 are three large through holes for the linear displacement device 2.13 to pass through; 2.2.4 are twelve M8 threaded through holes for securing three linear displacement devices 2.13 to the large cavity flange 2.2.

The movable triangular disc 2.8 is provided with four through holes, wherein 2.8.1 is a threaded through hole of M10, and the needle valve 2.7 is fixed through threaded connection; 2.8.2 are three positioning threaded through holes of M6, and the outer end cover 2.5 is connected; 2.8.3 are six positioning through holes which are matched with 2.2.2 on the large cavity flange 2.2, the movable triangular disc 2.8 is fixed on the large cavity flange 2.2 in the assembling process, and the movable triangular disc is taken down after the assembling is finished; 2.8.4 is three large through holes for the thimble of linear displacement 2.13 to pass through and fixed by nuts.

The connection mode of the moving part is as follows: a threaded through hole M10 is formed in the middle of the movable triangular disc 2.8, and the needle valve 2.7 is fixed on the movable disc 2.8 through threaded connection; three through holes are formed in three corners of the movable triangular disc 2.8, and ejector pins of the three linear displacement devices are fixed on the movable triangular disc 2.8 through nuts; at one end of the needle valve 2.7, an outer end cover 2.5 is connected to a movable triangular disc 2.8 through three screws, and an O-shaped sealing ring 2.6 needs to be placed in a groove of the outer end cover 2.5 in the connection process; at the other end of the movable triangular disc 2.8, a long tail pipe 2.12 is fixed on the movable triangular disc 2.8 through threaded connection, and a graphite gasket 2.9 is required to be placed at the end face of the long tail pipe 2.12 in the connection process; the outer end of the long tail pipe 2.12 is sleeved with a bearing 2.11. The fixed part comprises a connecting flange 2.1, a large-cavity flange 2.2, an bakelite lining layer 2.4 and a bearing sleeve 2.10. The connection relationship of the fixed part is that three linear displacement devices 2.13 in the moving part are fixed on a large-cavity flange 2.2 through screws; the bearing sleeve 2.10 is sleeved outside the bearing 2.11 and is fixed on the large-cavity flange 2.2 through three M6 screws; the other end of the large-cavity flange 2.2 is connected with a connecting flange 2.1.

The working method of the needle valve type flow-adjustable gas generator ground test device disclosed by the embodiment comprises the following steps:

the method comprises the following steps: determining the flow regulation ratio, the position of each flow needle valve 2.7, the moving speed of each flow needle valve 2.7 and the retention time according to the experimental purpose;

step two: selecting a pressure sensor with a proper measuring range of 30MPa and a stay wire displacement sensor of 50mm according to the experiment purpose;

step three: assembling the needle valve type flow-adjustable gas generator ground test device according to the assembling relation;

the mounting sequence of the driving device is as follows: 1) an O-shaped sealing ring 2.6 is arranged in a groove of the outer end cover 2.5 and is fixed on the movable triangular disc 2.8 through three inner hexagonal screws; 2) the needle valve 2.7 is mounted on the moving triangular disc 2.8 by a threaded connection (M10); 3) fixing the movable triangular disc 2.8 on the large-cavity flange 2.2 by using a positioning screw; 4) two of the three linear displacement devices 2.13 are arranged, each linear displacement device is provided with four positioning screws, the positioning screws are used for fixing the linear displacement devices on the large-cavity flange 2.2, and meanwhile, the extended ejector pins are fixed on the movable triangular disc 2.8 through nuts; 5) fixing a bearing cover 2.10 on a large-cavity flange 2.2 by using three screws, and meanwhile, installing a long tail pipe 2.12 on a movable triangular disc 2.8 through threaded connection, wherein a tool withdrawal groove of the front end thread of the long tail pipe 2.12 is provided with a graphite gasket 2.9; 6) mounting the last linear displacement device 2.13 on the large cavity flange 2.2; 7) taking down the positioning screw in 3); 8) the large-cavity flange 2.2 is connected with the connecting flange 2.1 by using the inner hexagon bolts of M10; 9) the connecting flange 2.1 is connected to the gas generator 1 by eight M8 bolts to form a needle valve type flow-adjustable gas generator.

Step four: and (4) according to the initial position determined in the first step, zeroing the position of the needle valve 2.7, and determining the initial position required by the needle valve 2.7.

Before the experiment, the needle valve 2.7 is moved slowly until the needle valve impacts the inner profile of the throat liner 1.14; the desired initial position point is derived from the geometry of the device and the needle 2.7 is slowly withdrawn to the target position, i.e. the initial zero position.

Step five: and setting the displacement and the residence time of the needle valve 2.7 according to the calculation result of the step one.

The movement displacement, the running time and the retention time of the needle valve can be set at will, and four different movement combinations are realized.

Step six: and preparing to carry out an experiment and carrying out pressure data acquisition.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. Other structures and principles are the same as those of the prior art, and are not described in detail herein.