A multi-stage filtering device for a solid fuel gas generator and a method of installing the same

Abstract

The application discloses a kind of multistage filter devices for solid gas generator, including shell, first filter, adsorption ring, support structure and second filter;The shell axial one end is the air inlet end of multistage filter device, and is connected with the outlet of solid gas generator, the shell axial other end is the air outlet end of multistage filter device;The first filter and second filter are arranged in the shell, and the first filter is connected with the port of shell air inlet end, and the second filter is connected with the port of shell air outlet end;The first filter and second filter outside are equipped with support structure, and the support structure is equipped with adsorption ring between shell inner wall;The gas entering from the air inlet end of the shell is filtered in turn through the first filter, adsorption ring and second filter.The application also discloses a corresponding installation method.The application meets the working requirement of downstream actuating system through three-stage filtration, and solves the problem of reliable filtration of solid residue-rich gas.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solid residue filtration, and particularly relates to a multi-stage filter device for a solid gas generator and a mounting method thereof. BACKGROUND

[0002] The solid gas generator relies on the combustion of internal solid main charge to generate a large amount of gas energy, which is converted into mechanical work by a downstream actuation system to complete certain specific functions, and can be used for unlocking, launching, separating and providing thrust control of a missile flight attitude of an aircraft. The gas generated by the solid gas generator is mixed with a large amount of solid residues. In order to ensure the normal and reliable operation of the downstream actuation system, the gas needs to be filtered so that the content and particle size of the solid residues in the filtered gas meet the use requirements of the downstream actuation system.

[0003] The existing gas filtration scheme usually adds an inertial separation device, a metal filter plate, a metal filter tube or the like to the gas passage to filter the gas. Due to the differences in space, gas internal pressure, gas flow rate, solid residue content and other parameters, the existing filtration scheme still has the following problems:

[0004] a) The inertial separation device has a complex structure and a large volume, and cannot be applied to a space-constrained occasion;

[0005] b) The cross-section type metal filter device is installed on the entire gas passage, and a large amount of solid residues is easily deposited on the filter surface, causing the filter device to be blocked, the gas flow loss to be increased, and the internal pressure to be increased, which may even lead to disintegration;

[0006] c) The cross-section type filter screen and the woven screen have low structural strength, and are easily burned through under the action of high-flow, high-speed and high-pressure gas flow. Meanwhile, the filter structure has a small capacity for containing solid residues, and is not suitable for occasions with a large amount of residues;

[0007] d) The filter device has a complex design, and unreasonable filtration scheme leads to problems such as unobvious filtration effect and large structure quality. SUMMARY

[0008] In view of one or more of the above defects or improvement needs of the prior art, the present application provides a multi-stage filter device for a solid gas generator and a mounting method thereof. Three-stage filtration is realized through a first filter, an adsorption ring and a second filter, the working requirements of the downstream actuation system are met, and the problem of reliable filtration of gas rich in solid residues is solved.

[0009] To achieve the above-mentioned purpose, according to one aspect of the present application, a multi-stage filter device for a solid gas generator is provided, which comprises a shell, a first filter, an adsorption ring, a support structure and a second filter.

[0010] The shell axial one end is the air inlet end of the multi-stage filtering device, and the port of the air inlet end is connected with the outlet of the solid fuel gas generator.

[0011] The first filter and the second filter are arranged in the shell, and the first filter is connected with the port of the air inlet end of the shell, and the second filter is connected with the port of the air outlet end of the shell.

[0012] The first filter and the second filter are externally provided with a support structure, and the support structure is arranged between the inner wall of the shell and the adsorption ring.

[0013] The fuel gas entering from the air inlet end of the shell is filtered in sequence through the first filter, the adsorption ring and the second filter.

[0014] As a further improvement of the application, the first filter comprises a filter shell, one end of which is a connecting port, and a first filter plate, a second filter plate and a bottom cover are arranged in sequence opposite the port.

[0015] The first filter plate and the second filter plate and the second filter plate and the bottom cover are respectively provided with a first support ring and a second support ring, so as to form a first cavity between the connecting port of the filter shell and the first filter plate, a second cavity between the first filter plate and the second filter plate, and a third cavity between the second filter plate and the bottom cover.

[0016] As a further improvement of the application, the outer wall of the first cavity is circumferentially provided with a plurality of air holes, and the air holes are directed towards the adsorption ring.

[0017] As a further improvement of the application, the filtering precision of the first filter plate is lower than that of the second filter plate, and the filtering precision of the first filter plate gradually decreases from outside to inside in the radial direction.

[0018] As a further improvement of the application, the equivalent area of the air holes of the first filter is not less than 2 times the area of the air inlet end port of the shell.

[0019] As a further improvement of the application, the inner wall of the filter shell is provided with a limiting boss for axial limiting during installation of the first filter plate, the first support ring, the second filter plate and the second support ring.

[0020] As a further improvement of the application, the second filter comprises a filter cartridge, and a plurality of through holes are arranged on the filter cartridge; one end of the filter cartridge is provided with a connecting joint, and the inner cavity of the filter cartridge is in communication with the inner cavity of the connecting joint, and the connecting joint is connected with the air outlet end of the shell.

[0021] As a further improvement of the present application, the filter cartridge surface is provided with a metal powder sintering layer; and / or, the filter cartridge is provided in a bending structure in the ring direction.

[0022] As a further improvement of the present application, the equivalent area of the through hole of the second filter is not less than 2 times of the area of the shell air inlet end port.

[0023] As a further improvement of the present application, the support structure is a hollow bracket structure, and is provided with a clearance hole at each axial end, the first filter and the second filter are arranged inside the support structure and connected with the air inlet end and the air outlet end of the shell through the corresponding clearance holes.

[0024] According to a second aspect of the present application, a mounting method of the multi-stage filter device for solid fuel gas generator is provided, comprising the following steps:

[0025] The shell is divided into a first inlet variable cross-section section, a first intermediate cylindrical section, and a first outlet variable cross-section section, wherein the first intermediate cylindrical section is evenly divided into two half-cylindrical sections along the axial direction; the support structure is divided into a second inlet variable cross-section section, a second intermediate cylindrical section, and a second outlet variable cross-section section;

[0026] The first filter is screwed with the first inlet variable cross-section section through the clearance hole of the second inlet variable cross-section section, and the second filter is screwed with the first outlet variable cross-section section through the clearance hole of the second outlet variable cross-section section;

[0027] The two ends of the second intermediate cylindrical section are connected with the second inlet variable cross-section section and the second outlet variable cross-section section, respectively;

[0028] The first inlet variable cross-section section and the first outlet variable cross-section section are connected through the two half-cylindrical sections, and the adsorption ring is filled between the shell and the support structure before being closed.

[0029] Overall, compared with the prior art, the above technical solutions conceived by the present application have the following beneficial effects:

[0030] (1) The multi-stage filter device for solid fuel gas generator of the present application uses the long and winding filter channel of the first filter to intercept and capture solid residues, which are gradually deposited in the first filter, thereby effectively filtering the fuel gas and greatly reducing the content of solid residues in the fuel gas. The clean fuel gas obtained after the fuel gas flowing out of the first filter is filtered by the large-area adsorption ring and then filtered by the second filter meets the working requirements of the downstream actuating system, and solves the problem of reliable filtration of fuel gas rich in solid residues.

[0031] (2) The multi-stage filtering device for the solid fuel gas generator of the present application, the first filter comprises double-layer filter plates with light front and heavy rear and coarse front and fine rear, the first filter plate and the second filter plate are provided with different filtering precision, the first filter plate captures most of the solid particles in the fuel gas, the second filter plate intercepts the tiny solid particles leaked by the first filter plate, and the first filter plate core is directly opposite the air inlet end of the front shell, the amount of intercepted solid particles is more, in order to prevent the first filter plate core from being blocked, the filtering precision gradually decreases from the outer circle to the core; meanwhile, the first support ring and the second support ring are additionally arranged between the first filter plate, the second filter plate and the bottom cover, which can effectively lengthen the filtering path, improve the filtering efficiency, increase the dust holding capacity of the first filter plate, and effectively solve the problem of small containing capacity of the filtering device for solid residues.

[0032] (3) The multi-stage filtering device for the solid fuel gas generator of the present application, the filtering structure of the first filter is located at the far end of the fuel gas inlet, the fuel gas outlet of the first filter is a vent hole arranged on the shell close to the air inlet end, located at the near end of the fuel gas inlet, through the cooperation design of the equivalent area of the vent hole and the air inlet end port, the problem of disintegration caused by the blockage of the filtering device, the increase of internal pressure and the like can be effectively avoided.

[0033] (4) The multi-stage filtering device for the solid fuel gas generator of the present application, the filtering cylinder surface of the second filter has a large number of small vent holes with large equivalent diameter, which can achieve high-precision filtering while ensuring the smoothness of the fuel gas in the effective space. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a structure schematic view of the multi-stage filtering device for the solid fuel gas generator of the embodiment of the present application;

[0035] Figure 2 It is a structure schematic view of the first filter involved in the multi-stage filtering device of the embodiment of the present application;

[0036] Figure 3 It is a structure schematic view of the support ring involved in the first filter of the embodiment of the present application;

[0037] Figure 4 It is a structure schematic view of the support structure involved in the multi-stage filtering device of the embodiment of the present application;

[0038] Figure 5 It is a structure schematic view of the second filter involved in the multi-stage filtering device of the embodiment of the present application;

[0039] Figure 6 It is a sectional structure schematic view of the second filter involved in the multi-stage filtering device of the embodiment of the present application.

[0040] In all the drawings, the same reference signs refer to the same technical features, specifically: 1 - housing, 2 - first filter, 3 - adsorption ring, 4 - support structure, 5 - second filter;

[0041] 21 - filter housing, 22 - vent hole, 23 - first filter plate, 24 - first support ring, 25 - second filter plate, 26 - second support ring, 27 - bottom cover, 28 - limiting boss; 51 - filter cartridge, 52 - connecting joint, 53 - through hole. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0045] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0047] As shown in Figure 1 The multi-stage filtering device for solid fuel gas generator of the embodiment of the present application comprises a shell 1, a first filter 2, an adsorption ring 3, a support structure 4 and a second filter 5. The shell 1 has an air inlet end at one axial end, and the air inlet end is connected with the outlet of the solid fuel gas generator. The shell 1 has an air outlet end at the other axial end. The first filter 2 and the second filter 5 are arranged inside the shell 1. The first filter 2 is connected with the port of the air inlet end of the shell 1, and the second filter 5 is connected with the port of the air outlet end of the shell 1. The support structure 4 is arranged outside the first filter 2 and the second filter 5, and the adsorption ring 3 is arranged between the support structure 4 and the inner wall of the shell 1.

[0048] The high-pressure and high-speed fuel gas containing solid residues entering from the air inlet end of the shell 1 is filtered by the first filter. The solid residues are intercepted and captured, and gradually deposited in the first filter, so that the fuel gas is effectively filtered, and the content of the solid residues in the fuel gas is greatly reduced. The fuel gas flowing out of the vent hole of the first filter is adsorbed and filtered by the large-area adsorption ring, and then filtered by the second filter, and then clean fuel gas is discharged from the air outlet end of the shell 1 to meet the working requirements of the downstream actuating system, thereby solving the problem of reliable filtering of fuel gas rich in solid residues.

[0049] In the preferred embodiment, the first filter 2 and the second filter 5 are respectively threadedly connected with the ports of the air inlet end and the air outlet end of the shell 1. More specifically, the external threads of the first filter 2 and the second filter 5 are connected with the internal threads of the ports of the air inlet end and the air outlet end of the shell 1.

[0050] In the preferred embodiment, the shell 1 is made of TC11 material, and comprises a cylindrical segment and an oval head (the ports of the air inlet end and the air outlet end). The wall thickness of the shell 1 is 4 mm.

[0051] Specifically, the first filter 2 comprises a filter housing 21, air holes 22, a first filter plate 23, a first support ring 24, a second filter plate 25, a second support ring 26 and a bottom cover 27. The filter housing 21 is a variable cross-section rotary body structure, one end of which is a connecting port for connecting with the port of the air inlet end of the shell 1, and the first filter plate 23, the second filter plate 25 and the bottom cover 27 are arranged in sequence opposite the port. The first filter plate 23 and the second filter plate 25 and the second filter plate 25 and the bottom cover 27 are respectively provided with the first support ring 24 and the second support ring 26, which are used to separate the first filter plate 23 and the second filter plate 25 and the second filter plate 25 and the bottom cover 27, so as to form a first cavity between the connecting port of the filter housing and the first filter plate 23, a second cavity between the first filter plate 23 and the second filter plate 25, and a third cavity between the second filter plate 25 and the bottom cover 27.

[0052] In the embodiment of the present application, the outer wall of the first cavity is provided with a plurality of air holes 22 in the circumferential direction, and the gas filtered by the first filter 2 is discharged from the air holes 22, which are directed towards the adsorption ring 3. Preferably, the equivalent area of the air holes 22 is not less than 2 times the area of the air inlet end port of the shell 1, so as to ensure that the gas can flow smoothly from the air holes 22 and avoid excessive pressure of the first filter 2.

[0053] In the embodiment of the present application, since the first filter plate 23 is close to the air inlet end of the front shell 1 and opposite the air inlet end of the shell 1, the solid particle interception amount is more, and it is preferred to use a filter plate with larger porosity and lower filtering precision, and the filtering precision of the first filter plate 23 is preferably 150um~200um. Further preferably, in order to prevent the middle part of the first filter plate 23 from being blocked, the filtering precision of the first filter plate 23 gradually decreases from outside to inside in the radial direction. In addition, the thickness of the first filter plate 23 is preferably 4mm.

[0054] The second filter plate 25 is arranged on the rear side (the side close to the bottom cover) of the first filter plate 23, and it is preferred to use a filter plate with smaller porosity and higher filtering precision, and the filtering precision of the second filter plate 25 is preferably 100um. In addition, the thickness of the second filter plate 25 is preferably 4mm.

[0055] In the preferred embodiment, the first filter plate 23, the first support ring 24, the second filter plate 25 and the second support ring 26 are all pressed from stainless steel wires, preferably from stainless steel wires with a diameter of 0.3mm~0.4mm, and by controlling the corresponding porosity in the pressing process, different filtering precision can be achieved. Therefore, the first support ring 24 and the second support ring 26 of the present application not only can play a supporting role, but also can play a filtering role due to the same steel wire mesh structure pressed from stainless steel wires.

[0056] The first support ring 24 and the second support ring 26 can be only annular structures, or can be provided with a reinforcing structure in the annular structure, preferably an annular structure with a reinforcing structure, which is advantageous to improve the support stiffness to withstand the impact of high-pressure gas. Figure 3 In the specific embodiments, a specific structure of the first support ring 24 and the second support ring 26 is provided, but is not limited to this form of arrangement.

[0057] In the preferred embodiment, the inner wall of the filter housing 21 is provided with a corresponding limiting boss 28 for axial limiting when the first filter plate 23, the first support ring 24, the second filter plate 25, and the second support ring 26 are installed. Specifically, during installation, the first filter plate 23 is first installed into the housing 21 from the tail, and is limited by the limiting boss 28, and then the first support ring 24, the second filter plate 25, and the second support ring 26 are sequentially installed from the tail, and finally the bottom cover 27 is fixed to the tail of the housing 21. In the preferred embodiment, the bottom cover 27 and the tail of the housing 21 are welded and formed.

[0058] In the preferred embodiment, the first filter plate 23, the second filter plate 25, and the bottom cover 27 are arranged in parallel with each other.

[0059] In the multi-stage filtering device of the present application, the first filter 2 constitutes a first filtering structure. The high-pressure and high-speed gas containing solid residues entering from the gas inlet port of the housing 1 enters the first cavity and sequentially passes through the first filter plate 23 into the second cavity, passes through the second filter plate 25 into the third cavity to reach the bottom cover 27. After the gas reaches the bottom cover, it is bent by 180°, then enters the second cavity through the second filter plate 25, enters the first cavity through the first filter plate 23, and is discharged from the first filter 2 into the cavity of the housing 1 through the air hole 22 on the outer wall of the first cavity, completing the first filtering.

[0060] In the first filtering, the solid residues collide with the first filter 2 at high speed under the action of inertia. After passing through the above-mentioned long and winding filtering channel, the solid residues are intercepted and captured by the filtering device and gradually deposited on the first filter plate 23, the first support ring 24, the second filter plate 25, and the second support ring 26, effectively filtering the gas and greatly reducing the content of solid residues in the gas, effectively intercepting larger solid particles contained in the gas.

[0061] Further, the adsorption ring 3 and the support structure 4 are arranged in the inner cavity of the housing 1. The adsorption ring 3 is tightly attached to the inner wall of the housing 1 under the action of the support structure 4. The support structure is a hollow bracket structure, and its two axial ends are provided with relief holes for the first filter 2 and the second filter 5 to pass through. The first filter 2 and the second filter 5 are arranged inside the support structure 4 and are connected with the gas inlet end and the gas outlet end of the housing 1 by passing through the corresponding relief holes.

[0062] In the preferred embodiment, the adsorption ring 3 is made of high-temperature-resistant filter material, preferably basalt fiber, with a filament diameter of 13 um and a porosity of preferably more than 70%. The adsorption ring 3 has a high specific surface area and strong adsorption and solid particle holding capacity.

[0063] Further, as shown in Figure 6 The second filter 5 specifically includes a filter cartridge 51 and a connecting joint 52. The filter cartridge 51 is provided with the connecting joint 52 at one end, and the internal cavity of the filter cartridge 51 is in communication with the internal cavity of the connecting joint 52. The connecting joint 52 passes through the positioning hole at the end of the support structure 4 and is connected to the gas outlet end of the shell 1.

[0064] The filter cartridge 51 is arranged in a bent structure in the circumferential direction. The filter cartridge 51 is made of a stainless steel plate that is bent and then welded to form a shape, thereby increasing the contact area of the filter cartridge 51 and the gas. The filter cartridge 51 is provided with a plurality of through holes 53. Preferably, the equivalent area of the through holes 53 is not less than 2 times the area of the gas inlet end port of the shell 1, which can also make the gas flow smoothly and effectively avoid excessive pressure in the shell.

[0065] In the preferred embodiment, the surface of the filter cartridge 51 is sprayed with a high-precision metal powder sintering layer, preferably stainless steel powder. The thickness of the metal powder sintering layer is preferably 0.2 mm, and the filtering precision of the metal powder sintering layer is 50 um. The specific filtering precision is determined by matching the allowed precision of the downstream actuation system.

[0066] In the multi-stage filtering device of the present application, the adsorption ring 3 and the support structure 4 constitute the second filtering structure, and the filter cartridge 51 of the second filter 5 constitutes the third filtering structure. The gas sprayed from the ventilation hole 22 of the first filter 2 flows at high speed to the large-area adsorption ring 3, which adsorbs the remaining solid residues in the gas, realizing the second filtering; the gas is then filtered by the high-precision metal powder sintering layer on the surface of the filter cartridge, realizing the third filtering. The clean gas obtained after three times of filtering meets the working requirements of the downstream actuation system, and solves the problem of reliable filtering of the gas rich in solid residues.

[0067] The multi-stage filtering device for a solid gas generator of the present application has the advantages of simple structure, low cost, and light weight. The structure size of the first filter, the second filter, and the adsorption ring and the filtering precision of the first filter plate, the second filter plate, and the metal powder sintering layer can be adjusted according to the solid residue content and particle size in the gas, which can adapt to the filtering of gas with different pressures, solid residue contents, and solid particle sizes.

[0068] The multi-stage filtering device for a solid gas generator of the present application embodiment provides a preferred installation method, but is not limited thereto. As long as the multi-stage filtering device of the present application can be formed and shaped, it can be used. The installation method of the present embodiment specifically includes the following steps:

[0069] The shell 1 is divided into a first inlet variable cross-section section, a first intermediate cylindrical section, and a first outlet variable cross-section section, wherein the first intermediate cylindrical section is evenly divided into two half-cylindrical sections along the axial direction; in order to facilitate processing and save costs, the first inlet variable cross-section section and the first outlet variable cross-section section are preferably formed by processing titanium rods, and the two half-cylindrical sections are preferably formed by processing titanium tubes;

[0070] The support structure 4 is divided into a second inlet variable cross-section section, a second intermediate cylindrical section, and a second outlet variable cross-section section, the first filter 2 is respectively threaded through the accommodation holes of the second inlet variable cross-section section and the first inlet variable cross-section section, and the second filter 5 is respectively threaded through the accommodation holes of the second outlet variable cross-section section and the first outlet variable cross-section section; the two ends of the second intermediate cylindrical section are connected to the second inlet variable cross-section section and the second outlet variable cross-section section, respectively; preferably, the two ends are connected by welding, and further preferably, the two ends are connected by argon arc welding;

[0071] The first inlet variable cross-section section and the first outlet variable cross-section section are connected through the two half-cylindrical sections, and before being closed, the adsorption ring 3 is filled between the shell 1 and the support structure 4; in order to avoid the influence of a large amount of heat generated during argon arc welding on the adsorption ring 3, the half-cylindrical sections are preferably connected to the first inlet variable cross-section section and the first outlet variable cross-section section 13 by welding, and further preferably, the half-cylindrical sections are connected to the first inlet variable cross-section section and the first outlet variable cross-section section 13 by laser welding or electronic welding.

[0072] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-stage filtering device for a solid fuel gas generator, characterized by, The shell, the first filter, the adsorption ring, the support structure and the second filter are included. The shell is connected with the outlet of the solid fuel generator at the air inlet end of the multi-stage filtering device. The first filter and the second filter are arranged in the shell, and the first filter is connected with the port of the air inlet end of the shell, and the second filter is connected with the port of the air outlet end of the shell. The support structure is arranged outside the first filter and the second filter, and the support structure and the inner wall of the shell are provided with the adsorption ring. The fuel gas entering from the air inlet end of the shell is filtered by the first filter, the adsorption ring and the second filter in sequence. The first filter includes a filter shell, one end of which is a connecting port, and a first filter plate, a second filter plate and a bottom cover are arranged in sequence opposite the port. First support ring and second support ring are arranged between the first filter plate and the second filter plate and between the second filter plate and the bottom cover, so as to form a first cavity between the connecting port of the filter shell and the first filter plate, a second cavity between the first filter plate and the second filter plate, and a third cavity between the second filter plate and the bottom cover. The outer wall of the first cavity is provided with a plurality of air holes in the circumferential direction, and the air holes are directed to the adsorption ring.

2. The multi-stage filtration device for a solid fuel gas generator according to claim 1, characterized by, Through the cooperation design of the air holes and the equivalent area of the air inlet end port, the blockage of the filtering device can be effectively avoided, and the internal pressure rise caused by the blockage can be avoided.

3. The multi-stage filtration device for a solid fuel gas generator according to claim 1, characterized by, The filtering precision of the first filter plate gradually decreases from outside to inside in the radial direction.

4. The multi-stage filtration device for a solid fuel gas generator according to claim 1, characterized by The equivalent area of the air hole of the first filter is not less than 2 times the area of the air inlet end port of the shell.

5. The multi-stage filtering device for solid fuel gas generators according to any one of claims 1-4, characterized in that, The inner wall of the filter shell is provided with a limiting boss for axial limiting during installation of the first filter plate, the first support ring, the second filter plate and the second support ring.

6. The multi-stage filtration device for a solid fuel gas generator according to claim 5, characterized by The second filter includes a filter cartridge provided with a plurality of through holes, and a connecting joint is arranged at one end of the filter cartridge.

7. The multi-stage filtering device for solid fuel gas generators according to any of claims 1-4, 6, characterized in that, The surface of the filter cartridge is provided with a metal powder sintering layer; and / or, the filter cartridge is arranged in a bending structure in the circumferential direction; and / or, the equivalent area of the through hole of the second filter is not less than 2 times the area of the air inlet end port of the shell.

8. A method of installing a multi-stage filter arrangement for a solid fuel gas generator as claimed in any one of claims 1 to 7, characterised in that, The support structure is a hollow bracket structure, and the first filter and the second filter are arranged in the support structure and connected with the air inlet end and the air outlet end of the shell through the corresponding relief holes. The shell is divided into a first inlet variable cross-section section, a first intermediate cylindrical section and a first outlet variable cross-section section, and the first intermediate cylindrical section is divided into two half-cylindrical sections along the axial direction. The first filter is connected with the first inlet variable cross-section section through the relief hole of the second inlet variable cross-section section, and the second filter is connected with the first outlet variable cross-section section through the relief hole of the second outlet variable cross-section section. The two ends of the second intermediate cylindrical section are connected with the second inlet variable cross-section section and the second outlet variable cross-section section, respectively; The first inlet variable cross-section section and the first outlet variable cross-section section are connected through two half-cylindrical sections, and the adsorption ring is filled between the shell and the support structure before being closed.

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