CN209991451U

CN209991451U - Gas generator

Info

Publication number: CN209991451U
Application number: CN201920314178.1U
Authority: CN
Inventors: 罗世彬; 席文雄; 许德泉; 戴健; 袁运飞
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2020-01-24
Anticipated expiration: 2029-03-13

Abstract

The utility model provides a fuel gas generator, fuel gas generator includes from last to down in proper order: the combustor comprises an injector assembly, a combustor assembly and a nozzle assembly, wherein the injector assembly is arranged at the head of the fuel gas generator, the nozzle assembly is arranged at the tail of the fuel gas generator, and the combustor assembly is fixed in the middle of the injector assembly and the nozzle assembly through a screw rod; the combustor assembly includes: the protective sleeve is arranged on the periphery of the transparent combustion chamber; the protective sheath is for the components of a whole that can function independently setting, including first section protective sheath and second section protective sheath. The utility model provides a gas generator mainly aims at gas-liquid spouting burning, can diversely carry out optical measurement with many means.

Description

Gas generator

Technical Field

The utility model belongs to the gas generator field relates to a gas generator.

Background

Gas-liquid injection combustion is a common combustion mode of a gas generator and is always the key point of domestic and overseas research. How to make the gas-liquid fuel mix and burn completely is one of the key technologies of the gas generator. During experiment, only by accurately measuring the combustion process from multiple directions, credible experimental data can be obtained, so that the method is very important for in-depth research and display of the experimental data.

The performance parameters of the small gas generator for ground tests are accurately obtained, and the method has important significance for researching the performance of the aerospace propeller. Not only can save a large amount of costs, can also reduce the risk, promote the security performance, also make a contribution to laying the basis of research after.

The traditional measuring method is mostly in a contact type, namely, a sensor probe is deeply inserted into the internal flow field of the gas generator, and the parameters of the sensor probe are measured after the internal flow field is stable. The method is widely applied at present, but the precision is reduced because the interference of the flow field is inevitably generated due to the property that the probe penetrates into the flow field. The non-contact diagnosis technology is greatly different from the contact type in the measurement mode, and the defects are avoided. At present, the research of non-contact diagnosis technology is mainly focused on the field of optical diagnosis, and the shooting of an injector outlet flow field by adopting optical equipment is the development direction of the cold flow and heat flow test technology of the injector at present, such as a high-speed camera, a planar laser induced fluorescence device, a Raman spectrometer and the like.

The research on gas-gas injection transparent combustion devices has been conducted, and little discussion has been made on gas-gas injection transparent combustion devices.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas generator mainly aims at gas-liquid spouting burning, can diversely carry out optical measurement with many means.

The technical scheme of the utility model is that: the utility model provides a fuel gas generator, fuel gas generator includes from last to down in proper order: the combustor comprises an injector assembly, a combustor assembly and a nozzle assembly, wherein the injector assembly is arranged at the head of the fuel gas generator, the nozzle assembly is arranged at the tail of the fuel gas generator, and the combustor assembly is fixed in the middle of the injector assembly and the nozzle assembly through a screw rod;

the combustor assembly includes: the protective sleeve is arranged on the periphery of the transparent combustion chamber; the protective sleeve is arranged in a split mode and comprises an upper half protective sleeve and a lower half protective sleeve, the upper half protective sleeve comprises an upper half base body and at least two upper half protective columns extending towards the transparent combustion chamber along the upper half base body, and a first groove is formed between every two adjacent upper half protective columns;

the lower half section of protective sleeve comprises a lower half section of base body and at least two lower half section of protective columns extending to the direction of the transparent combustion chamber along the lower half section of base body, and a second groove is formed between every two adjacent lower half section of protective columns;

the upper half section protection column is connected with the lower half section protection column, and is formed on the periphery of the transparent combustion chamber in a surrounding manner so as to support the transparent combustion chamber;

the first groove is communicated with the second groove, and an observation window is formed.

Preferably, the injector assembly comprises an injector body, a reducing agent nozzle, a reducing agent gland, an oxidant nozzle, a combustion chamber cover plate, a nozzle, an oxidant annular cavity and a reducing agent annular cavity;

the upper end of the injector body is provided with a hollow reducing agent gland, and the lower end of the injector body is provided with a combustion chamber cover plate; the reducing agent connecting nozzle is arranged on the reducing agent gland, a reducing agent annular cavity is formed at the lower part of the reducing agent gland, a nozzle is arranged at the lower part of the reducing agent annular cavity, a reducing agent channel is arranged on the nozzle, and the reducing agent connecting nozzle, the reducing agent gland, the reducing agent annular cavity and the nozzle are communicated;

the oxidant nozzle is connected with the injector body, an oxidant annular cavity is formed between the injector body and the combustion chamber cover plate, the combustion chamber cover plate is provided with an oxidant inlet, and the oxidant nozzle, the oxidant annular cavity and the oxidant inlet are communicated;

the nozzle and the oxidant inlet are respectively communicated with the transparent combustion chamber.

Preferably, the lower end of the reducing agent nozzle is provided with a reducing agent gland, the reducing agent gland comprises a horizontal part, a vertical part connected with the horizontal part in a bending mode and an extending part extending outwards along the vertical part in a horizontal mode, and the inner walls of the horizontal part and the vertical part are tightly attached to the outer wall of the reducing agent nozzle;

preferably, an O-ring is disposed between the injector body and the reducing agent gland.

Preferably, a bent oxidant channel is formed between the oxidant annular cavity and the oxidant nozzle.

Preferably, the reducing agent nozzle, the reducing agent gland, the reducing agent annular cavity, the nozzle, the oxidizing agent annular cavity and the transparent combustion chamber are coaxially arranged.

Preferably, the igniter adopts a spark plug igniter and is arranged at the upper protective sleeve.

Preferably, the transparent combustion chamber is cylindrical, the inner wall of the lower half section of protection post is provided with a first curved surface, the inner wall of the lower half section of protection post is provided with a second curved surface, and the first curved surface and the second curved surface are respectively matched with the outer wall of the transparent combustion chamber.

Preferably, the spray pipe assembly is arranged in a split manner and comprises a contraction section, an expansion section and a throat part, and the throat part is clamped and fixed through the contraction section and the expansion section;

the upper end of the contraction section is connected with the lower half section of the protective sleeve in a clamped mode, the lower end of the contraction section is connected with the expansion section in a clamped mode, and a throat portion is formed in the middle of the joint of the contraction section and the expansion section.

Preferably, the injector body is clamped with the combustion chamber cover plate, and a first tetrafluoro gasket is arranged at the clamping position; and/or

The reducing agent connector and the reducing agent gland, the oxidizing agent connector and the injector body, and the nozzle and the injector body are fixedly connected, and a convex part is arranged on the injector body along the direction close to the nozzle; and/or

The combustion chamber cover plate is clamped with the upper section of protective sleeve, and a second polytetrafluoroethylene gasket is arranged between the combustion chamber cover plate and the upper section of protective sleeve; and/or

The lower end of the upper half section of protective sleeve is clamped with the upper end of the transparent combustion chamber, and a third PTFE gasket is arranged between the upper half section of protective sleeve and the transparent combustion chamber; and/or

The upper end of the lower half section of protective sleeve is clamped with the lower end of the transparent combustion chamber, and a fourth tetrafluoro gasket is arranged between the lower half section of protective sleeve and the transparent combustion chamber; and/or

The lower end of the lower section of protective sleeve is connected with the contraction section in a clamping mode, and a fifth fluorine gasket is arranged between the lower section of protective sleeve and the contraction section.

Preferably, a red copper gasket is arranged between the igniter and the upper protective sleeve, the igniter comprises an extension part, and the extension part is arranged at the joint of the igniter and the upper protective sleeve.

The utility model has the advantages that:

(1) the utility model provides a fuel gas generator, which is mainly used for gas-liquid injection combustion, is practical and safe, and can perform optical measurement in multiple directions and ways.

(2) The utility model discloses a periphery of transparent combustion chamber is located to upper and lower two sections protective sheaths, and first recess and second recess on the protective sheath form the observation window, can utilize optical instrument to measure the inside of combustion chamber. The utility model discloses when guaranteeing better light transmissivity, increased the protective sheath, promoted the compressive property of combustion chamber subassembly, prevent all the other parts after the transparent combustion chamber is broken from dropping, causing the loss.

(3) The utility model discloses a modularization is handled. The protective sleeve is composed of an upper section and a lower section, the design is convenient for taking out the broken inner transparent combustion chamber and replacing a new transparent combustion chamber, combustion under different working conditions can be realized, the tail spray pipe is arranged in a split mode and is composed of an expansion section, a throat part and a contraction section, the using amount of tungsten copper infiltration materials of the throat part can be reduced, and cost is saved.

(4) The utility model provides a gas generator locates the transparent combustion chamber periphery with the protective sheath, and the mode of the outside protective sheath of taking promptly, inside transparent combustion chamber is applicable to the combustion mechanism research of the miniature gas generator in ground under the low pressure environment, has reference meaning to the research of large-scale aerospace propeller. The utility model relates to a low pressure gas generator suitable for ground low discharge.

(5) The utility model discloses gas generator adopts the head injector to be last, and the method of placing under the afterbody spray tube. The placing method is suitable for gas-liquid injection (the fuel forms are gas and liquid), the phenomenon that incompletely combusted fuel flows back to the head after combustion is finished is avoided, and the probability of accidents is reduced.

(6) The utility model discloses a spark plug ignites, and the cost is lower, simple structure, and safe and reliable has simplified the ignition process. The utility model discloses a screw rod is connected fixedly to head injector subassembly and afterbody jet assembly, and the pretightning force is exerted to whole to head and the tail cooperation nut to whole gas generator reaches sealed requirement through the pretightning force.

Drawings

FIG. 1 is a schematic perspective view of a gasifier according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of an alternative perspective of a gasifier according to an embodiment of the present invention;

FIG. 3 is a schematic view of an injector assembly in a gasifier according to an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3A;

fig. 5 is a schematic cross-sectional view of a combustor assembly in a gasifier according to an embodiment of the present invention;

FIG. 6 is a schematic view of a nozzle assembly in a gasifier according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a combustion chamber assembly of a gas generator according to an embodiment of the present invention; (omitting igniter)

FIG. 8 is a schematic perspective view of the upper section of the protective sheath in the embodiment of the present invention;

fig. 9 is a schematic view of a three-dimensional structure of a lower section of a protective sheath in an embodiment of the present invention.

Reference numerals: 1-an injector assembly; 2-a combustor assembly; 3-a nozzle assembly;

10-an injector body; 100-convex part; 101-an oxidant channel; 11-reducing agent nipple; 12-a reductant gland; 120-a horizontal portion; 121-vertical section; 122-an extension; 13-an oxidant nozzle; 14-a first tetrafluoro pad; 15-combustion chamber cover plate; 150-an oxidant inlet; 16-a nozzle; 160-reductant passage; 17-an oxidizer ring cavity; 18-reductant ring cavity; 19-O-ring;

20-an observation window; 21-a second tetrafluoro pad; 22-a red copper gasket; 23-an igniter; 230-an extension; 24-a third tetrafluoro pad; 25-a fourth tetrafluoro spacer; 26-a fifth fluorocarbon gasket; 27-lower half section of protective sleeve; 28-transparent combustion chamber; 29-upper half protective sleeve; 79-protective sheath;

31-a constriction; 32-a sixth tetrafluoro gasket; 33-throat; 34-an expansion section; 35-nozzle outlet;

41-a first nut; 42-a third nut; 43-screw rod; 44-second nut.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of the utility model provides a small-size gasifier, as shown in fig. 1-9, please refer to fig. 1, the gasifier includes from last to down in proper order: the combustor comprises an injector assembly 1, a combustor assembly 2 and a nozzle assembly 3, wherein the injector assembly 1 is arranged at the head part of the gas generator, the nozzle assembly 3 is arranged at the tail part of the gas generator, and the combustor assembly 2 is fixed in the middle of the injector assembly 1 and the nozzle assembly 3 through a screw 43; the utility model discloses injector subassembly 1 and spout subassembly 3 realize connecting through four equidimension screw rods 43 of equipartition, fix combustion chamber subassembly 2 in the middle of injector subassembly 1 and spout subassembly 3. The upper and lower ends of the screw 43 are engaged with the first nut 41 and the second nut 44, respectively, to apply a pre-load to the intermediate combustion chamber assembly to seal the connected components. The embodiment of the utility model provides an adopt the screw rod of four the same models to connect fixedly for under different burning operating modes, make things convenient for the replacement of head and afterbody part. And the addition of four third nuts 42 under the combustion chamber cover plate 15 of the injector assembly 1 prevents the combustor head injector components from falling apart during disassembly or glass breakage.

The combustor assembly 2 includes: the igniter comprises a protective sleeve 79, an igniter 23 and a transparent combustion chamber 28, wherein the protective sleeve 79 is arranged on the periphery of the transparent combustion chamber 28; the protective sleeve is arranged in a split way and comprises an upper half protective sleeve 29 and a lower half protective sleeve 27,

the upper half protective sleeve 29 comprises an upper half base 290 and at least two upper half protective columns 291 extending along the upper half base 290 to the transparent combustion chamber 28, and a first groove 293 is formed between every two adjacent upper half protective columns 291;

the lower-section protective sleeve 27 comprises a lower-section base body 270 and at least two lower-section protective columns 271 extending along the lower-section base body 270 to the direction of the transparent combustion chamber 28, and a second groove 273 is formed between every two adjacent lower-section protective columns 271;

the embodiment of the utility model provides a second half section protection pillar 271 and first half section protection pillar 291 are four.

The upper half section protection column 291 is connected with the lower half section protection column 271, and is formed around the transparent combustion chamber 28 to support and protect the transparent combustion chamber 28;

the

first grooves

293 and 293 communicate with each other and form the observation window 20.

The embodiment of the utility model provides a transparent combustion chamber subassembly, practical safety can diversely, many hands section ground carry out optical measurement to small-size gas generator.

The embodiment of the utility model provides a first section protective sheath 29 and second section protective sheath 27 can adopt stainless steel material to make, the utility model discloses first section protective sheath 29 and second section protective sheath 27 can adopt the rectangle. The transparent combustion chamber 28 of the embodiment of the present invention may be cylindrical, and the material is preferably quartz glass. The embodiment of the utility model provides a form four observation windows 20, corresponding to four faces of rectangle protective sheath, can utilize optical instrument to measure from four inside in the face of burning respectively. Obviously, the present invention is not limited to the material and shape of the half-protective jacket 29, the lower half-protective jacket 27, and the transparent combustion chamber 28.

The embodiment of the utility model provides a number that first section protection post 291 and second section protection post 271 set up equals, and corresponding setting. The embodiment of the utility model provides an adopt first section protection post 291 and second section protection post 271 to enclose to close the periphery that forms in transparent combustion chamber 28, the utility model discloses a first recess 293 and first recess 293 form the observation window, can utilize optical instrument to measure transparent combustion chamber 28's inside. The utility model discloses when guaranteeing better light transmissivity, increased the protective sheath, promoted the compressive property of combustion chamber subassembly, prevent all the other parts after the transparent combustion chamber is broken from dropping, causing the loss.

The embodiment of the utility model provides an adopt the form of upper and lower two sections protective sheath combinations, make things convenient for the change that takes out and new transparent combustion chamber after the broken of inside transparent combustion chamber.

Preferably, the injector assembly 1 comprises an injector body 10, a reducing agent nozzle 11, a reducing agent gland 12, an oxidant nozzle 13, a combustion chamber cover plate 15, a nozzle 16, an oxidant annular cavity 17 and a reducing agent annular cavity 18;

the upper end of the injector body 10 is provided with a hollow reducing agent gland 12, and the lower end of the injector body 10 is provided with a combustion chamber cover plate 15; the reducing agent nozzle 11 is arranged on the reducing agent gland 12, a reducing agent annular cavity 18 is formed at the lower part of the reducing agent gland 12, a nozzle 16 is arranged at the lower part of the reducing agent annular cavity 18, a reducing agent channel 160 is arranged on the nozzle 16, and the reducing agent nozzle 11, the reducing agent gland 12, the reducing agent annular cavity 18 and the nozzle 16 are communicated;

the oxidant nozzle 13 is connected with the injector body 10, an oxidant annular cavity 17 is formed between the injector body 10 and the combustion chamber cover plate 15, the combustion chamber cover plate 15 is provided with an oxidant inlet 150, and the oxidant nozzle 13, the oxidant annular cavity 17 and the oxidant inlet 150 are communicated.

The nozzle 16 is in communication with the transparent combustion chamber 28 and the oxidant inlet 150 is in communication with said transparent combustion chamber 28.

The reducing agent enters the transparent combustion chamber 28 through the nozzle 16 and the oxidizing agent enters the transparent combustion chamber 28 through the oxidizing agent inlet 150. The embodiment of the utility model provides a reductant and oxidant carry out the co-combustion in transparent combustion chamber 28.

Preferably, the reducing agent gland 12 is arranged at the lower end of the reducing agent nozzle 11, the reducing agent gland 12 is arranged in a hollow manner, and includes a horizontal portion 120, a vertical portion 121 connected with the horizontal portion 120 in a bending manner, and an extending portion 122 extending outwards along the horizontal portion 121, and the inner walls of the horizontal portion 120 and the vertical portion 121 are tightly attached to the outer wall of the reducing agent nozzle 11, so as to obtain a better sealing effect.

Preferably, an O-ring 19 is disposed between the injector body 10 and the reductant gland 12. The O-ring 19 is intended to provide a seal between the injector body 10 and the reductant gland 12.

Preferably, a bent oxidant channel 101 is formed between the annular oxidant chamber 17 and the oxidant nozzle 13 to avoid any interference with the mounting structure.

The injector assembly 1 is primarily used to provide the fuel needed for combustion in the gas generator, and the fuel of the present embodiment is illustrated as oxygen and kerosene. As shown in fig. 3-4, kerosene is used as the reducing agent, and enters the device from the reducing agent nozzle 11, enters the annular reducing agent cavity 18 through the straight-flow passage of the reducing agent nozzle 11, then passes through the reducing agent passage 160, enters the nozzle 16, and finally enters the transparent combustion chamber 28 of the combustion chamber assembly 2 from the nozzle 16. Oxygen, acting as an oxidizer, passes from the straight flow path of the oxidizer nozzle 13, through the oxidizer passage 101, into the oxidizer annular chamber 17, and finally through the oxidizer inlet 150, also into the transparent combustion chamber 28 of the combustion chamber assembly 2, to be mixed with the kerosene.

In the embodiment of the present invention, the reducing agent nozzle 11, the reducing agent gland 12, the reducing agent annular chamber 18, the nozzle 16, the oxidant annular chamber 17 and the transparent combustion chamber 28 are coaxially disposed, which is beneficial to the gas-liquid mixing.

The combustor assembly 2 is primarily the site of combustion and ignition. The igniter 23 is a spark plug igniter and is arranged at the upper protective sleeve 29. The embodiment of the utility model provides an some firearm 23 can adopt the spark plug, and the cost is lower, simple structure, and safe and reliable has simplified the ignition process.

Further, the transparent combustion chamber 28 is cylindrical, the inner wall of the lower half section of the protection column 291 is provided with a first curved surface 292, the inner wall of the lower half section of the protection column 271 is provided with a second curved surface 272, the first curved surface 292 is matched with the outer wall of the transparent combustion chamber 28, the second curved surface 272 is matched with the outer wall of the transparent combustion chamber 28, and the first curved surface 292 is tightly attached to the transparent combustion chamber 28, and the second curved surface 272 is tightly attached to the transparent combustion chamber 28.

Preferably, the nozzle assembly 3 is a split arrangement, and comprises a contraction section 31, an expansion section 34 and a throat part 33, wherein the throat part 33 is clamped and fixed by the contraction section 31 and the expansion section 34;

the upper end of the nozzle contraction section 31 is clamped with the lower half section protective sleeve 27, the lower end of the contraction section 31 is clamped with the expansion section 34, and a throat part 33 is formed in the middle of the joint of the contraction section 31 and the expansion section 34. The nozzle assembly 3 is mainly used in the accelerating place of fuel gas, the throat 33 is made of tungsten copper, and the fixing is realized by the extrusion of the expansion section 34 and the contraction section 31. A sixth tetrafluoro gasket 32 is used to achieve a joint seal between the contraction section 31 and the expansion section 34.

Preferably, the injector body 10 is mechanically connected with the combustion chamber cover plate 15, and a first teflon gasket 14 is arranged at the connection position, so as to realize sealing between the injector body 10 and the combustion chamber cover plate 15 and prevent leakage of propellant medium (kerosene).

And/or the reducing agent connector 11 and the reducing agent gland 12, the oxidizing agent connector 13 and the injector body 10, and the nozzle 16 and the injector body 10 are fixedly connected, and can adopt a welding mode.

The injector body 10 is provided with a protrusion 100 along a direction close to the nozzle 16, which can play a role of limiting, so as to limit the axial displacement of the nozzle 16 and prevent the nozzle 16 from falling.

And/or the combustion chamber cover plate 15 is mechanically connected with the upper half-section protective sleeve 29, and a second tetrafluoro gasket 21 is arranged between the combustion chamber cover plate 15 and the upper half-section protective sleeve 29, so as to realize the sealing between the injector assembly 1 and the combustion chamber assembly 2.

And/or the lower end of the upper half-section protective sleeve 29 is mechanically connected with the upper end of the transparent combustion chamber 28, and a third tetrafluoro gasket 24 is arranged between the upper half-section protective sleeve 29 and the transparent combustion chamber 28 and used for sealing the upper half-section protective sleeve 29 and the cylindrical transparent combustion chamber 28.

And/or the upper end of the lower half-section protective sleeve 27 is mechanically connected with the lower end of the transparent combustion chamber 28, and a fourth tetrafluoro gasket 25 is arranged between the lower half-section protective sleeve 27 and the transparent combustion chamber 28 and used for sealing the lower half-section protective sleeve 27 and the cylindrical transparent combustion chamber 28.

The connection between the upper protective casing 29 and the lower protective casing 27 may be a mechanical fit.

And/or the lower end of the lower half-section protective sleeve 27 is clamped with the contraction section 31, and a fifth teflon gasket 26 is arranged between the lower half-section protective sleeve 27 and the contraction section 31 and used for realizing the sealing between the combustion chamber assembly 2 and the nozzle assembly 3.

Preferably, a red copper gasket 22 is arranged between the igniter 23 and the upper protective sleeve 29 for sealing the connection between the igniter 23 and the upper protective sleeve 29 of the combustion chamber assembly 2, which has the advantage that the red copper gasket 22 is softer due to the different hardness between different materials, resulting in better sealing under the action of the pretension.

The igniter 23 comprises an extension 230, and the extension 230 is arranged at the joint of the igniter 23 and the upper protective sleeve 29 and used for limiting the transverse displacement of the igniter 23 and playing a role in limiting.

It should be noted that, in the embodiment of the present invention, the installation positions of the first tetrafluoro gasket 14, the second tetrafluoro gasket 21, the third tetrafluoro gasket 24, the fourth tetrafluoro gasket 25, the fifth tetrafluoro gasket 26, the sixth tetrafluoro gasket 32, the O-ring 19, the red copper gasket 22, etc. are all provided with corresponding grooves according to the national standard.

The embodiment of the present invention is not intended to limit the present invention, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A gasifier, comprising, in order from top to bottom: the combustor comprises an injector assembly (1), a combustor assembly (2) and a nozzle assembly (3), wherein the injector assembly (1) is arranged at the head of the gas generator, the nozzle assembly (3) is arranged at the tail of the gas generator, and the combustor assembly (2) is fixed in the middle of the injector assembly (1) and the nozzle assembly (3) through a screw (43);

the combustor assembly (2) comprises: the igniter comprises a protective sleeve (79), an igniter (23) and a transparent combustion chamber (28), wherein the protective sleeve (79) is arranged on the periphery of the transparent combustion chamber (28); the protective sleeve is arranged in a split way and comprises an upper half protective sleeve (29) and a lower half protective sleeve (27),

the upper half-section protective sleeve (29) comprises an upper half-section base body (290) and at least two upper half-section protective columns (291) extending towards the transparent combustion chamber (28) along the upper half-section base body (290), and a first groove (293) is formed between every two adjacent upper half-section protective columns (291);

the lower half-section protective sleeve (27) comprises a lower half-section base body (270) and at least two lower half-section protective columns (271) extending towards the transparent combustion chamber (28) along the lower half-section base body (270), and a second groove (273) is formed between every two adjacent lower half-section protective columns (271);

the upper half section of protection column (291) is connected with the lower half section of protection column (271), and the upper half section of protection column and the lower half section of protection column enclose the periphery of the transparent combustion chamber (28) to support the transparent combustion chamber (28);

the first groove (293) and the first groove (293) are communicated and form a viewing window (20).

2. Gas generator according to claim 1, characterized in that the injector assembly (1) comprises an injector body (10), a reducing agent nozzle (11), a reducing agent gland (12), an oxidizing agent nozzle (13), a combustion chamber cover plate (15), a nozzle (16), an annular oxidizing agent chamber (17) and an annular reducing agent chamber (18);

the upper end of the injector body (10) is provided with a hollow reducing agent gland (12), and the lower end is provided with a combustion chamber cover plate (15); the reducing agent nozzle (11) is arranged on the reducing agent gland (12), a reducing agent annular cavity (18) is formed at the lower part of the reducing agent gland (12), a nozzle (16) is arranged at the lower part of the reducing agent annular cavity (18), a reducing agent channel (160) is arranged on the nozzle (16), and the reducing agent nozzle (11), the reducing agent gland (12), the reducing agent annular cavity (18) and the nozzle (16) are communicated;

the oxidant nozzle (13) is connected with the injector body (10), an oxidant annular cavity (17) is formed between the injector body (10) and the nozzle (16) as well as between the combustion chamber cover plate (15) and the combustion chamber cover plate (15), the combustion chamber cover plate (15) is provided with an oxidant inlet (150), and the oxidant nozzle (13), the oxidant annular cavity (17) and the oxidant inlet (150) are communicated;

the reducing agent enters the transparent combustion chamber (28) through a nozzle (16) and the oxidizing agent enters through an oxidizing agent inlet (150).

3. The gas generator as claimed in claim 2, characterized in that a reducing agent gland (12) is arranged at the lower end of the reducing agent nozzle (11), the reducing agent gland (12) comprises a horizontal part (120), a vertical part (121) connected with the horizontal part (120) in a bending way, and an extension part (122) horizontally extending outwards along the vertical part (121), and the inner walls of the horizontal part (120) and the vertical part (121) are tightly attached to the outer wall of the reducing agent nozzle (11).

4. The gas generator according to claim 2, characterized in that an O-ring (19) is provided between the injector body (10) and the reductant gland (12).

5. Gas generator according to claim 2, characterized in that between the annular oxidizer chamber (17) and the oxidizer nozzle (13) there is formed an oxidizer channel (101) arranged in a bent manner.

6. Gas generator according to claim 2, the reductant nipple (11), reductant gland (12), reductant annular chamber (18), nozzles (16), oxidant annular chamber (17) and the transparent combustion chamber (28) being coaxially arranged.

7. The gasifier as claimed in claim 1, wherein: the transparent combustion chamber (28) is cylindrical, the inner wall of the lower half section of the protection column (291) is provided with a first curved surface (292), the inner wall of the lower half section of the protection column (271) is provided with a second curved surface (272), and the first curved surface (292) and the second curved surface (272) are respectively matched with the outer wall of the transparent combustion chamber (28).

8. The gas generator according to claim 1, characterized in that the nozzle assembly (3) is provided in a split manner and comprises a contraction section (31), an expansion section (34) and a throat (33), wherein the throat (33) is clamped and fixed by the contraction section (31) and the expansion section (34);

the upper end of the contraction section (31) is mechanically connected with the lower half section protective sleeve (27), the lower end of the contraction section (31) is mechanically connected with the expansion section (34), and a throat part (33) is formed in the middle of the joint of the contraction section (31) and the expansion section (34).

9. Gas generator according to claim 2, characterized in that the injector body (10) is mechanically connected to a combustion chamber cover (15) and in that the connection is provided with a first tetrafluoro gasket (14); and/or

The reducing agent connector (11) and the reducing agent gland (12), the oxidizing agent connector (13) and the injector body (10) and the nozzle (16) and the injector body (10) are fixedly connected, and a convex part (100) is arranged on the injector body (10) along the direction close to the nozzle (16); and/or

The combustion chamber cover plate (15) is mechanically connected with the upper half-section protective sleeve (29), and a second tetrafluoro gasket (21) is arranged between the combustion chamber cover plate (15) and the upper half-section protective sleeve (29); and/or

The lower end of the upper half section of protective sleeve (29) is mechanically connected with the upper end of the transparent combustion chamber (28), and a third tetrafluoro gasket (24) is arranged between the upper half section of protective sleeve (29) and the transparent combustion chamber (28); and/or

The upper end of the lower half section of protective sleeve (27) is mechanically connected with the lower end of the transparent combustion chamber (28), and a fourth tetrafluoro gasket (25) is arranged between the lower half section of protective sleeve (27) and the transparent combustion chamber (28); and/or

The lower end of the lower half section of protective sleeve (27) is mechanically connected with the contraction section (31), and a fifth fluo gasket (26) is arranged between the lower half section of protective sleeve (27) and the contraction section (31).

10. The gas generator as claimed in claim 1, characterized in that a red copper gasket (22) is arranged between the igniter (23) and the upper protective sheath (29), the igniter (23) comprising an extension (230), the extension (230) being arranged at the junction of the igniter (23) and the upper protective sheath (29).