CN114991950A

CN114991950A - Gas generator air intake system with switching air feed

Info

Publication number: CN114991950A
Application number: CN202210715266.9A
Authority: CN
Inventors: 张齐万; 王芳芳; 谌欣月; 王康平; 何维琴
Original assignee: Chongqing Weijia Disai Electromechanical Co ltd
Current assignee: Chongqing Weijia Disai Electromechanical Co ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-09-02

Abstract

The invention discloses a gas generator air intake system with switching air supply, which belongs to the technical field of gas generators and comprises: the collecting pipe, the air-supply line, the mixing chamber, the air inlet chamber, the diverter valve, U-shaped air supply pipe and throttle valve, pressure release pipe and air control valve, through when the pressure in the air inlet chamber of one side is less than the opposite side, the high-pressure gas in the air inlet chamber promotes the slide bar to the opposite side, because the tangent second ejector pad that promotes the second ejector pad downstream of the first ejector pad of slide bar tip and the second ejector pad in the pole setting, make in the caulking groove in closing plate embedding mixing chamber, accomplish the shutoff of one side, realize the switching of air supply line, when the pressure of both sides is traded, the closing plate passes through first spring automatic lifting, make the mist pass through, through switching different natural gas delivery sources, make gas supply pressure stable, guarantee normal pressure's supply.

Description

Gas generator air intake system with switching air feed

Technical Field

The invention belongs to the technical field of gas generators, and particularly relates to a gas generator air inlet system with switching gas supply.

Background

The gas generator is a novel and efficient new energy generator which takes combustible gas such as liquefied gas, natural gas and the like as comburent to replace gasoline and diesel oil as engine power. When traditional gas generator during operation, carry out fuel transport to gas generator through the natural gas conveyor of single line, when any link breaks down among the fuel transportation process, whole gas generator will receive the influence and forced the shut down, influences work efficiency.

Disclosure of Invention

The present invention is directed to a gas generator intake system with switching air supply to solve at least one of the problems set forth in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

a gas generator air intake system with switched air supply, comprising: the air supply system comprises a collecting pipe, an air inlet pipe, a mixing chamber, an air inlet chamber, a switching valve, a U-shaped air supply pipe, a throttle valve, a pressure relief pipe and an air regulating valve.

Wherein, in order to form the required homogeneous mixing gas of engine combustion, the interlude of collecting pipe is connected with the air-supply line perpendicularly, the both ends of collecting pipe all have the mixing chamber through first intake pipe symmetric connection, and the mixing chamber is used for the gas that storage air and natural gas mixture formed.

In order to convey natural gas into the mixing chamber, the air inlet chamber is arranged on the outer side of the mixing chamber, a second air inlet pipe is communicated between the air inlet chamber and the mixing chamber, and the mixing chambers at two ends of the collecting pipe and the air inlet chamber are arranged in a mirror symmetry mode;

wherein, when traditional gas generator during operation, carry out fuel transport to gas generator through the natural gas conveyor of single line, when any link broke down among the fuel transportation process, whole gas generator will receive the influence and forced to shut down, the diverter valve is installed inside the collecting pipe, realizes double-line transportation through the installation diverter valve, has increased productivity effect.

In order to realize double-line fuel conveying, a caulking groove is formed in the mixing chamber, a circulation port is formed in the caulking groove and is communicated with the end part of the opening of the U-shaped air supply pipe through a flange, two parallel air pipes of the U-shaped air supply pipe are fuel conveying pipes, one end of the throttle valve is communicated with the U-shaped air supply pipe, and the other end of the throttle valve enters each cylinder group in the gas generator through a third air inlet pipe.

Wherein, in order to reduce the too big condition that causes of pipeline rupture or explosion of U-shaped air supply pipe internal gas pressure, the pressure release pipe is installed between the U-shaped air supply pipe, install the atmospheric pressure protection valve on the pressure release pipe, shift the pressure of U-shaped air supply pipe one side to in the opposite side pipeline through the atmospheric pressure protection valve, the pressure release pipe all is provided with two sets ofly with the atmospheric pressure protection valve for the pressure release of U-shaped air supply pipe both sides pipeline.

The air inlet quantity is adjusted in real time according to the air inlet quantity of natural gas, so that the air inlet quantity of mixed gas is controlled according to the actual speed of an engine, and the air regulating valve is installed at a pipe orifice of the air inlet pipe through a flange.

Preferably, the air inlet chamber comprises a housing, a gas pipe is arranged in the housing through a clamping piece in a threaded manner, and a diversion trench is formed in the inner wall of the gas pipe in a threaded manner;

the clamping piece comprises a U-shaped buckle arranged on the gas pipe, supporting legs are bent outwards at two ends of an opening of the U-shaped buckle, threaded holes and bolts matched with the threaded holes are formed in the supporting legs, and the bolts are connected with the inner wall of the housing in an installing mode.

Preferably, the second air inlet pipe comprises a pipe wall, a first baffle and a second baffle are symmetrically connected in the pipe wall, the first baffle is higher than the second baffle, and a guide plate is connected between the first baffle and the second baffle.

Preferably, the switching valve comprises mounting seats mounted on the inner wall of the bus pipe, the mounting seats are bilaterally symmetrical by taking the air inlet pipe as an axis, slide rods are symmetrically arranged between the mounting seats in a matched and sliding manner, first push blocks are mounted at two ends of each slide rod, a plurality of mounting holes are formed in an embedding groove in the mixing chamber at equal intervals along the axial direction of each mounting seat, telescopic rods are mounted in the mounting holes, a sealing plate is mounted on each telescopic rod, the sealing plate is matched with the embedding groove, a vertical rod is vertically mounted at the center of the upper surface of the sealing plate, a second push block is mounted on the vertical rod, and the contact surfaces of the first push block and the second push block are oblique planes.

Preferably, the telescopic rod is sleeved with a first spring, and two ends of the first spring are fixedly connected with the sealing plate and the bottom of the mounting hole respectively.

Preferably, a ring of sealing gasket is arranged on one side of the sealing plate close to the caulking groove.

Preferably, the pressure relief pipe includes a first branch pipe communicated with an air pipe on one side of the U-shaped air supply pipe, the air pressure protection valve is installed at one end of the first branch pipe, which is far away from the U-shaped air supply pipe, the air pipe on the other side of the U-shaped air supply pipe is communicated with a second branch pipe, one end of the second branch pipe, which is far away from the U-shaped air supply pipe, is provided with a bent portion, and the bent portion extends into the air pressure protection valve and is communicated with the first branch pipe.

Preferably, the pneumatic protection valve comprises a valve cylinder, a valve core is arranged in the valve cylinder in a matched and sliding mode, a valve seat is arranged in the valve cylinder, and a second spring is connected between the valve core and the valve seat.

Preferably, the valve core is of a hollow structure, an opening communicated with the inside of the valve core is formed in one side, away from the second spring, of the valve core, and an air film is arranged at the opening in the valve core.

Preferably, the air regulating valve comprises an air inlet ring seat arranged in an air inlet pipe, a supporting rod is connected between the lower surface of the air inlet ring seat and the inner wall of the air inlet pipe, an adjusting disc is rotatably arranged at the bottom of the air inlet ring seat, an air hole with the same center as the air inlet ring seat is formed in the axis of the adjusting disc, an adjusting shifting piece is arranged on the adjusting disc, an adjusting groove is formed in the inner wall of the air inlet pipe, and the adjusting shifting piece slides in the adjusting groove in a matched manner;

the annular array is provided with five groups of rotating parts on the adjusting disk, and is arbitrary the rotating part includes the arc pole, the one end of arc pole is rotated through the round pin axle and is connected on the adjusting disk, the other end of arc pole is rotated through the round pin axle and is connected with the fan-shaped piece, one side of fan-shaped piece is rotated through the round pin axle and is connected on the air inlet ring seat, five groups mutually support and rotate the opening and shutting between the fan-shaped piece.

The invention has the beneficial effects that:

1. when the pressure in the air inlet chamber on one side is lower than that in the air inlet chamber on the other side, the sliding rod is pushed to the other side by high-pressure gas in the air inlet chamber, the sealing plate is embedded into the caulking groove in the mixing chamber to plug one side due to the fact that the first push block at the end part of the sliding rod is tangent to the second push block on the vertical rod and pushes the second push block to move downwards, and therefore the switching of the air supply pipeline is achieved.

2. When the valve core is used, when the pressure of gas in the gas pipe on one side of the U-shaped gas supply pipe is higher, the gas pushes the valve core to move towards one side of the valve seat, in order to smoothly push the valve core to move, the inner part of the valve core is of a hollow structure, an opening communicated with the inner part of the valve core is arranged on one side of the valve core, which is far away from the second spring, an air film is arranged at the opening on the valve core, the gas pushes the air film, the air film is blown inwards and pushes the valve core to move, the bending part of the second branch pipe is exposed, and part of gas is conveyed into the gas pipe on the other side of the U-shaped gas supply pipe along the second branch pipe, so that the pressure relief is realized, and the stable output of the U-shaped gas supply pipe is guaranteed.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the inside structure of the bus bar according to the present invention;

FIG. 3 is a schematic view of the construction of the fastener of the present invention;

FIG. 4 is a schematic view of the inner structure of a second air inlet pipe according to the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 2 according to the present invention;

FIG. 6 is a schematic view of the pneumatic protective valve of the present invention;

fig. 7 is a schematic structural view of an air adjustment valve of the present invention.

In the figure: 1. a collector pipe; 2. an air inlet pipe; 201. an adjustment groove; 3. a first intake pipe; 4. a mixing chamber; 401. caulking grooves; 4011. mounting holes; 5. an air intake chamber; 501. a housing; 502. a gas pipe; 5021. a diversion trench; 6. a second intake pipe; 601. a tube wall; 602. a first baffle plate; 603. a second baffle; 604. a baffle; 7. a U-shaped gas supply pipe; 8. a throttle valve; 9. a fastener; 901. a U-shaped buckle; 902. a leg; 10. a mounting seat; 11. a slide bar; 12. a first push block; 13. a telescopic rod; 14. sealing plates; 15. erecting a rod; 16. a second push block; 17. a first spring; 18. a pressure relief pipe; 1801. a first branch pipe; 1802. a second branch pipe; 1803. a bending part; 19. a pneumatic protection valve; 1901. a valve barrel; 1902. a valve core; 19021. an opening; 19022. a gas film; 1903. a valve seat; 1904. a second spring; 20. a gasket; 21. an air inlet ring seat; 22. a support bar; 23. an adjusting disk; 2301. air holes; 24. a rotating part; 2401. an arcuate bar; 2402. a fan-shaped sheet; 25. the plectrum is adjusted.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-2, an air intake system of a gas generator with switching air supply comprises: the air supply system comprises a collecting pipe 1, an air inlet pipe 2, a mixing chamber 4, an air inlet chamber 5, a switching valve, a U-shaped air supply pipe 7, a throttle valve 8, a pressure relief pipe 18 and an air regulating valve.

Wherein, in order to form the required homogeneous mixing gas of engine combustion, the interlude of collecting pipe 1 is connected with air-supply line 2 perpendicularly, and the both ends of collecting pipe 1 all have mixing chamber 4 through first intake pipe 3 symmetric connection, and mixing chamber 4 is used for the gas that storage air and natural gas mix and form.

In order to convey natural gas into the mixing chamber 4, the air inlet chamber 5 is arranged on the outer side of the mixing chamber 4, a second air inlet pipe 6 is communicated between the air inlet chamber 5 and the mixing chamber 4, and the mixing chambers 4 and the air inlet chamber 5 at two ends of the collecting pipe 1 are arranged in mirror symmetry;

wherein, when traditional gas generator during operation, carry out fuel transport to gas generator through the natural gas conveyor of single line, when any link breaks down among the fuel delivery process, whole gas generator will receive the influence and forced the shut down, and the diverter valve is installed inside collecting pipe 1, realizes the double-line transportation through the installation diverter valve, has increased the productivity effect.

Wherein, in order to realize the double-line fuel transport, caulking groove 401 has all been seted up to the inside of arbitrary mixing chamber 4, is provided with the circulation mouth in the caulking groove 401 and communicates through the flange with the tip of U-shaped air supply pipe 7 opening part, and two trachea that abreast of U-shaped air supply pipe 7 are fuel conveying pipe, and the one end and the U-shaped air supply pipe 7 intercommunication of throttle valve 8, the other end of throttle valve 8 gets into each cylinder group of gas generator inside through third intake pipe.

In order to reduce the situation of pipeline rupture or explosion caused by overlarge air pressure in the U-shaped air supply pipe 7, the pressure relief pipe 18 is installed between the U-shaped air supply pipes 7, the air pressure protection valve 19 is installed on the pressure relief pipe 18, the pressure on one side of the U-shaped air supply pipe 7 is transferred into the pipeline on the other side through the air pressure protection valve 19, and the two groups of pressure relief pipes 18 and the two groups of air pressure protection valves 19 are arranged for pressure relief of the pipelines on the two sides of the U-shaped air supply pipe 7.

Wherein, adjust the air input according to the air input of natural gas in real time to the air input of the actual speed control gas mixture according to the engine, air control valve passes through the flange and installs the mouth of pipe department at air-supply line 2.

Specifically, referring to fig. 3, in order to reduce noise during natural gas transportation, the air inlet chamber 5 includes a housing 501, a gas pipe 502 is installed inside the housing 501 through a thread of a fastener 9, and a diversion trench 5021 is formed in a thread of an inner wall of the gas pipe 502;

the clamping piece 9 comprises a U-shaped buckle 901 arranged on the gas pipe 502, two ends of the opening of the U-shaped buckle 901 are bent outwards to form a support leg 902, a threaded hole and a bolt matched with the threaded hole are formed in the support leg 902, and the bolt is connected with the inner wall of the housing 501 in an installing mode.

In application, the housing 501 protects the gas pipe 502, the guide groove 5021 guides the natural gas, and hydrodynamics is utilized, so that after the natural gas enters the gas pipe 502, collision between the gas and the gas pipe 502 is reduced, and energy loss is reduced to the minimum.

Specifically, referring to fig. 4, the second air inlet pipe 6 includes a pipe wall 601, a first baffle 602 and a second baffle 603 are symmetrically connected in the pipe wall 601, the first baffle 602 is higher than the second baffle 603, and a guide plate 604 is connected between the first baffle 602 and the second baffle 603.

In application, the diameters of the input ends of the guide plates 604 at the two sides are smaller than the diameter of the output end, so that the flow velocity of natural gas is increased, the ambient pressure is reduced, and air is mixed with the natural gas under the driving of pressure difference.

Specifically, please refer to fig. 2 and 4, in order to enable the gas supply pressure to be stable by switching different natural gas delivery sources, and ensure the supply of normal pressure, the switching valve includes a mounting seat 10 installed on the inner wall of the collecting pipe 1, the mounting seat 10 is bilaterally symmetrical with the air inlet pipe 2 as the axis, a sliding rod 11 is arranged between the symmetrical mounting seats 10 in a matching and sliding manner, first push blocks 12 are installed at two ends of the sliding rod 11, a plurality of mounting holes 4011 are formed on an embedding groove 401 in the mixing chamber 4 along the axial direction thereof at equal intervals, telescopic rods 13 are installed in the mounting holes 4011, sealing plates 14 are installed on the telescopic rods 13 together, the sealing plates 14 are adapted to the embedding groove 401, a vertical rod 15 is vertically installed at the center of the upper surface of the sealing plates 14, a second push block 16 is installed on the vertical rod 15, and the contact surfaces of the first push block 12 and the second push block 16 are oblique planes.

Wherein, the telescopic rod 13 is sleeved with a first spring 17, and two ends of the first spring 17 are respectively and fixedly connected with the sealing plate 14 and the bottom in the mounting hole 4011.

Wherein, a ring of sealing gasket 20 is arranged at one side of the sealing plate 14 close to the caulking groove 401.

In application, when the pressure in the air inlet chamber 5 at one side is lower than that at the other side, the sliding rod 11 is pushed to the other side by high-pressure air in the air inlet chamber 5, and the first push block 12 at the end of the sliding rod 11 is tangent to the second push block 16 on the upright rod 15 and pushes the second push block 16 to move downwards, so that the sealing plate 14 is embedded into the caulking groove 401 in the mixing chamber 4, the plugging at one side is completed, and the switching of an air supply pipeline is realized.

Specifically, referring to fig. 1 and 5, the pressure relief pipe 18 includes a first branch pipe 1801 communicated with an air pipe on one side of the U-shaped air supply pipe 7, the air pressure protection valve 19 is installed at one end of the first branch pipe 1801 far away from the U-shaped air supply pipe 7, an air pipe on the other side of the U-shaped air supply pipe 7 is communicated with a second branch pipe 1802, one end of the second branch pipe 1802 far away from the U-shaped air supply pipe 7 is provided with a bending portion 1803, and the bending portion 1803 extends into the air pressure protection valve 19 and is communicated with the first branch pipe 1801.

The pneumatic protection valve 19 includes a valve cylinder 1901, a valve core 1902 is fitted and slid in the valve cylinder 1901, a valve seat 1903 is installed in the valve cylinder 1901, and a second spring 1904 is connected between the valve core 1902 and the valve seat 1903.

In application, when the gas pressure in the gas pipe on one side of the U-shaped gas supply pipe 7 is higher, the gas pushes the valve core 1902 to move to one side of the valve seat 1903, the bent portion 1803 of the second branch pipe 1802 is exposed, and part of the gas is conveyed into the gas pipe on the other side of the U-shaped gas supply pipe 7 along the second branch pipe 1802, so as to implement pressure relief.

Specifically, referring to fig. 1 and fig. 6, in order to smoothly push the valve element 1902 to move, the valve element 1902 is hollow, an opening 19021 communicating with the interior of the valve element 1902 is disposed on a side of the valve element 1902 away from the second spring 1904, an air film 19022 is disposed at an opening 19021 on the valve element 1902, and the air pushes the air film 19022 to inwardly push the valve element 1902 to move.

Specifically, referring to fig. 6, in order to realize the adjustment of the air intake amount, the air regulating valve includes an air inlet ring seat 21 installed in the air inlet pipe 2, a support rod 22 is connected between the lower surface of the air inlet ring seat 21 and the inner wall of the air inlet pipe 2, an adjusting disc 23 is rotatably installed at the bottom of the air inlet ring seat 21, an air hole 2301 having the same center as the air inlet ring seat 21 is formed at the axis of the adjusting disc 23, an adjusting dial 25 is installed on the adjusting disc 23, an adjusting groove 201 is formed on the inner wall of the air inlet pipe 2, and the adjusting dial 25 is matched to slide in the adjusting groove 201;

wherein, annular array is provided with five groups of rotating parts 24 on the adjusting disk 23, and arbitrary rotating part 24 includes arc pole 2401, and the one end of arc pole 2401 is passed through the round pin hub and is rotated and connect on adjusting disk 23, and the other end of arc pole 2401 is rotated through the round pin hub and is connected with fan-shaped piece 2402, and one side of fan-shaped piece 2402 is rotated through the round pin hub and is connected on air inlet ring seat 21, and the rotation of mutually supporting is opened and shut between five groups of fan-shaped pieces 2402.

In the application, air access dials air inlet ring seat 21, move regulation plectrum 25 and make adjusting disk 23 rotate, because one side of fan-shaped piece 2402 rotates through the round pin hub and connects on air inlet ring seat 21, it rotates to drive arc pole 2401 when making adjusting disk 23 rotate, rotation of arc pole 2401 drives mutually supporting rotation between the fan-shaped piece 2402 and opens and shuts, when fan-shaped piece 2402 is opened, the air can get into ancient from wind hole 2301, adjust regulation plectrum 25 turned angle, mutually supporting rotation size of opening and shutting between the steerable fan-shaped piece 2402, thereby control air input.

The working principle is as follows:

when the natural gas mixing device works, natural gas is conveyed to the second gas inlet pipe 6 through the gas pipe 502, the diameter of the input end of the guide plate 604 on two sides in the second gas inlet pipe 6 is smaller than that of the output end, so that the flow rate of the natural gas is increased, the ambient pressure is reduced, air is mixed with the natural gas in the mixing chamber 4 under the drive of pressure difference, when the pressure in the gas inlet chamber 5 on one side is smaller than that on the other side, the slide rod 11 is pushed to the other side by high-pressure gas in the gas inlet chamber 5, because the first push block 12 at the end part of the slide rod 11 is tangent to the second push block 16 on the vertical rod 15 and pushes the second push block 16 to move downwards, the sealing plate 14 is embedded into the caulking groove 401 in the mixing chamber 4, one side plugging is completed, the switching of gas supply pipelines is realized, the mixed gas is conveyed to the throttle valve 8 through the U-shaped gas supply pipe 7, when the gas pressure in the gas pipe on one side of the U-shaped gas supply pipe 7 is larger, the gas push valve core 1902 moves to one side of the gas supply pipe 1903, the bent portion 1803 of the second branch pipe 1802 is exposed, and part of the gas is conveyed into the gas pipe on the other side of the U-shaped gas supply pipe 7 along the second branch pipe 1802, so that pressure relief is achieved, and the U-shaped gas supply pipe 7 is protected.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A gas generator air intake system with switching air supply, comprising:

the device comprises a collecting pipe (1), wherein the middle section of the collecting pipe (1) is vertically connected with an air inlet pipe (2), and two ends of the collecting pipe (1) are symmetrically connected with a mixing chamber (4) through a first air inlet pipe (3);

the air inlet chamber (5) is arranged on the outer side of the mixing chamber (4), a second air inlet pipe (6) is communicated between the air inlet chamber (5) and the mixing chamber (4), and the mixing chambers (4) at two ends of the collecting pipe (1) and the air inlet chamber (5) are arranged in a mirror symmetry manner;

a switching valve installed inside the manifold (1);

the mixing chamber is characterized by comprising a U-shaped air supply pipe (7) and a throttle valve (8), wherein a caulking groove (401) is formed in the mixing chamber (4), a circulation port is formed in the caulking groove (401) and is communicated with the end part of the opening of the U-shaped air supply pipe (7) through a flange, and one end of the throttle valve (8) is communicated with the U-shaped air supply pipe (7);

the pressure relief pipe (18), the pressure relief pipe (18) is installed between the U-shaped air supply pipes (7), and the pressure relief pipe (18) is provided with an air pressure protection valve (19);

and the air regulating valve is arranged at the pipe orifice of the air inlet pipe (2) through a flange.

2. A gas generator air intake system with switching air supply as claimed in claim 1, wherein: the gas inlet chamber (5) comprises a housing (501), a gas pipe (502) is installed in the housing (501) through a fastener (9) in a threaded mode, and a diversion trench (5021) is formed in the inner wall of the gas pipe (502) in a threaded mode;

the clamping piece (9) comprises a U-shaped buckle (901) arranged on the gas pipe (502), supporting legs (902) are bent outwards at two ends of an opening of the U-shaped buckle (901), threaded holes and bolts matched with the threaded holes are formed in the supporting legs (902), and the bolts are connected with the inner wall of the housing (501) in an installing mode.

3. A gas generator air intake system with switching air supply as claimed in claim 1, wherein: the second air inlet pipe (6) comprises a pipe wall (601), a first baffle (602) and a second baffle (603) are symmetrically connected in the pipe wall (601), the height of the first baffle (602) is higher than that of the second baffle (603), and a guide plate (604) is connected between the first baffle (602) and the second baffle (603) together.

4. A gas generator air intake system with switching air supply as claimed in claim 1, wherein: the switching valve comprises a mounting seat (10) arranged on the inner wall of the collecting pipe (1), the mounting seat (10) is symmetrical left and right by taking the air inlet pipe (2) as an axis, a sliding rod (11) is matched and slides between the symmetrical mounting seats (10), two ends of the sliding rod (11) are provided with first push blocks (12), a plurality of mounting holes (4011) are formed in the caulking groove (401) in the mixing chamber (4) at equal intervals along the axial direction of the caulking groove, telescopic rods (13) are arranged in the mounting holes (4011), sealing plates (14) are jointly arranged on the telescopic rods (13), the sealing plate (14) is matched with the caulking groove (401), the center of the upper surface of the sealing plate (14) is vertically provided with a vertical rod (15), the vertical rod (15) is provided with a second pushing block (16), and the contact surface of the first pushing block (12) and the second pushing block (16) is a chamfer surface.

5. A gas generator air intake system with switching air supply as claimed in claim 4, wherein: the telescopic rod (13) is sleeved with a first spring (17), and two ends of the first spring (17) are fixedly connected with the sealing plate (14) and the bottom in the mounting hole (4011) respectively.

6. A gas generator air intake system with switching air supply as claimed in claim 4, wherein: and a ring of sealing gasket (20) is arranged on one side of the sealing plate (14) close to the caulking groove (401).

7. A gas generator air intake system with switching air supply as claimed in claim 1, wherein: the pressure relief pipe (18) include first branch pipe (1801) with U-shaped air supply pipe (7) one side trachea intercommunication, the one end of keeping away from U-shaped air supply pipe (7) in first branch pipe (1801) is installed in atmospheric pressure protection valve (19), U-shaped air supply pipe (7) opposite side trachea intercommunication has second branch pipe (1802), the one end that U-shaped air supply pipe (7) were kept away from in second branch pipe (1802) is provided with portion of bending (1803), portion of bending (1803) stretch into in atmospheric pressure protection valve (19) and communicate with first branch pipe (1801).

8. A gas generator air intake system with switching air supply as claimed in claim 7, wherein: the air pressure protection valve (19) comprises a valve cylinder (1901), a valve core (1902) is arranged in the valve cylinder (1901) in a matched and sliding mode, a valve seat (1903) is installed inside the valve cylinder (1901), and a second spring (1904) is connected between the valve core (1902) and the valve seat (1903).

9. A gas generator air intake system with switching air supply as claimed in claim 8, wherein: the valve core (1902) is internally hollow, an opening (19021) communicated with the interior of the valve core (1902) is arranged on one side of the valve core (1902) departing from the second spring (1904), and an air film (19022) is arranged at the opening (19021) on the valve core (1902).

10. A gas generator air intake system with switching air supply as claimed in claim 1, wherein: the air regulating valve comprises an air inlet ring seat (21) arranged in an air inlet pipe (2), a supporting rod (22) is connected between the lower surface of the air inlet ring seat (21) and the inner wall of the air inlet pipe (2), a regulating disc (23) is rotatably arranged at the bottom of the air inlet ring seat (21), an air hole (2301) with the same center as the air inlet ring seat (21) is formed in the axis of the regulating disc (23), a regulating shifting piece (25) is arranged on the regulating disc (23), a regulating groove (201) is formed in the inner wall of the air inlet pipe (2), and the regulating shifting piece (25) slides in the regulating groove (201) in a matching manner;

wherein, annular array is provided with five groups of rotation portion (24) on adjusting disk (23), arbitrary rotation portion (24) include arc pole (2401), the one end of arc pole (2401) is passed through the round pin hub rotation and is connected on adjusting disk (23), the other end of arc pole (2401) is connected with fan-shaped piece (2402) through the round pin hub rotation, the one side of fan-shaped piece (2402) is connected on air inlet ring seat (21) through the round pin hub rotation, five groups mutually support between fan-shaped piece (2402) and rotate the opening and shutting.