Low-pressure oil filter filtering and purifying equipment of unmanned aerial vehicle system

Abstract

The invention relates to the technical field of unmanned aerial vehicle assemblies, in particular to low-pressure oil filter filtering and purifying equipment of an unmanned aerial vehicle system. According to the technical scheme, the filter comprises a shell assembly, a built-in filter assembly is installed at the bottom of the shell assembly, positioning type compression-resistant positioning assemblies are arranged on the two sides of the shell assembly and the two sides of the built-in filter assembly respectively, an elastic air bag assembly is installed in the shell assembly, and a cleaning and decomposing assembly is installed in the built-in filter assembly. Through back-and-forth friction between the filter holes of the replaceable filter element and the surface, accumulation of impurities is avoided, and through swinging of the adsorption balls, residues falling during work of the upper cleaning decomposition assembly and residues containing small particles flowing to the filter holes of the replaceable filter element are adsorbed layer by layer through flocculent structures on the surfaces of the adsorption balls; and the larger the oil pressure change is, the better the cleaning effect is, so that the conditions for microorganism survival are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicle components, and in particular to a low-pressure oil filter purification device for an unmanned aerial vehicle system. Background Art

[0002] A drone is an unmanned aircraft that does not require a person to fly on board. It can be remotely controlled or have a preset flight plan. As one of the core components in the drone system, the low-pressure oil filter is mainly installed in the middle fuselage. The product integrates functions such as filter element, self-sealing device and bypass valve. Since the small solid particles in the hydraulic system of the drone mainly come from the particles remaining in the system, the metal wear debris of the friction pair in the system, the particles invading from the outside and the particles generated by the decay of the oil, etc. During the operation of the system, the presence of particulate matter will cause the filter element to be blocked, which will affect the normal operation of the product. Therefore, the bypass valve and self-sealing device play a key role in the problem of filter element blockage.

[0003] The low-pressure filters commonly used in the market generally design the bypass valve and the self-sealing device separately. On the one hand, this design will complicate the internal flow channel of the product and increase the flow resistance of the product.

[0004] In the patent document with the publication number CN219672756U, a lightweight gasoline filter for use in UAV engines is disclosed, including a housing and a filter element assembly. The housing is composed of an upper housing and a lower housing. The upper housing and the lower housing are connected by a concave-convex snap-fit ​​method. The top of the upper housing is the oil outlet, and the bottom of the lower housing is the oil inlet. A step is provided under the upper housing and at the junction with the upper part of the center tube of the filter element assembly. A filter screen is installed in the center tube. The center tube and the filter screen constitute the filter element assembly. The center tube and the filter screen are an integrated structure. The lower part of the center tube is provided with a pin that is stuck at the oil inlet position of the lower housing. The original cover, upper and lower end covers and support springs are omitted, making the structure simpler and the weight lighter, which is particularly suitable for UAV engines.

[0005] When the above device is in use, if the oil inside the equipment is contaminated by microorganisms, such as bacteria and mold growing in the oil in a humid environment, the low-pressure oil filter cannot effectively prevent the passage of microorganisms and their metabolites. The above device does not decompose these debris that easily get stuck in the filter holes on the filter net, thereby seriously affecting the overall use efficiency of the filter component.

[0006] Therefore, the present application proposes a low-pressure oil filter purification device for an unmanned aerial vehicle system. Summary of the invention

[0007] The purpose of the present invention is to address the problem in the background technology that if the oil inside the equipment is contaminated by microorganisms, such as the growth of bacteria and mold in the oil in a humid environment, the low-pressure oil filter cannot effectively prevent the passage of microorganisms and their metabolites, and the above-mentioned device does not decompose these debris that easily get stuck in the filter holes on the filter net. A low-pressure oil filter purification device for an unmanned aerial vehicle system is proposed.

[0008] The technical solution of the present invention is: a low-pressure oil filter purification device for an unmanned aerial vehicle system, comprising a housing assembly, a built-in filter assembly is installed at the bottom of the housing assembly, positioning anti-pressure positioning assemblies are respectively provided on both sides of the housing assembly and the built-in filter assembly, an elastic airbag assembly is installed inside the housing assembly, and a cleaning and decomposition assembly is installed inside the built-in filter assembly; The housing assembly comprises an upper housing, an input pipe is fixedly mounted on one side of the upper housing, and an output pipe is fixedly mounted on the other side of the upper housing; The built-in filter assembly comprises a lower shell body plugged into the bottom of the upper shell body, a replaceable filter element is installed inside the lower shell body, a core shaft is installed on the top of the replaceable filter element, a retaining ring is fixedly installed inside the upper shell body, and a valve seat is slidably installed between the retaining ring and the core shaft; The cleaning and decomposition assembly includes multiple groups of bolt positioning blocks fixedly installed on the inner wall of the lower shell body, a first spring is fixedly installed inside the multiple groups of bolt positioning blocks, a limited clamping frame is fixedly installed on one side of the first spring, an arc guide block is fixedly installed on one side of the limited clamping frame, a guide rod is hinged on one side of the arc guide block, an adsorption ball is fixedly installed on one side of the guide rod, a wiping friction plate is fixedly installed on one side of the adsorption ball, a limited spring is fixedly installed at the connection between the arc guide block and the guide rod, and the limited spring is arranged in a fit state with the outer wall of the replaceable filter element.

[0009] Optionally, the elastic airbag assembly includes an airbag body fixedly mounted between the valve seat and the lower shell body, a second folding frame fixedly mounted on the inner wall of the airbag body, a first folding frame hingedly mounted on one side of the second folding frame, and connections on both sides of the second folding frame and the first folding frame are respectively hingedly mounted on the inner wall of the input pipe and the inner wall of the valve seat.

[0010] Optionally, two connection holes are provided at the center of the second folding frame and the first folding frame, two plug-in tubes are installed between the second folding frame and the first folding frame through the two connection holes, and a spring rod is fixedly installed between the two plug-in tubes.

[0011] Optionally, a side of the second folding frame close to the airbag body is arranged in a close contact with the airbag body, and the first folding frame is arranged in a close contact with the core shaft in a bent state.

[0012] Optionally, a cleaning hole is provided at the bottom of the lower shell, and a blocking piston is inserted into the cleaning hole.

[0013] Optionally, the positioning type pressure-resistant positioning component includes a positioning type sliding cavity frame fixedly installed inside the UAV, and a lower shell housing cavity block and an upper shell housing cavity block are slidably installed inside the positioning type sliding cavity frame.

[0014] Optionally, a group of fixed clamping blocks are fixedly installed on both sides of the upper shell, the number of the fixed clamping blocks is two groups, and the other group of fixed clamping blocks is fixedly installed on the outer side of the lower shell.

[0015] Optionally, a rope insertion base is fixedly installed on both sides of the positioning slide cavity frame, a limiting slide rope is fixedly installed inside the rope insertion base, and the upper shell housing cavity block and the lower shell housing cavity block are slidably installed on the outside of the limiting slide rope.

[0016] Optionally, the fixed clamping block and the upper shell housing cavity block are both fixedly installed with a limited clamping slider, a positioning rod is fixedly installed on one side of the limit clamping slider, an airbag block is fixedly installed on one side of the positioning rod, the limit clamping slider is located in the lower shell housing cavity block and is fixedly installed with an inner inclined slide block through the airbag block, the limit clamping slider is located in the upper shell housing cavity block and is fixedly installed with an insertion block through the airbag block, the outer side of the insertion block is hinged with an inclined insertion block through an arc spring, and a protruding snap-fit ​​block is fixedly installed on one side of the inclined insertion block, and the protruding snap-fit ​​block and the inner inclined slide block are arranged in an adaptive state.

[0017] Optionally, a friction pulley is rotatably installed on the outer side of the positioning rod and is respectively fitted with the inner walls of the lower shell housing cavity block and the upper shell housing cavity block, and a counting pulley is installed inside the positioning slide cavity frame, one side of the counting pulley is fixedly installed on the bottom of the lower shell housing cavity block, and the other side of the counting pulley is fixedly installed on the bottom of the upper shell housing cavity block.

[0018] In summary, the present application includes at least one of the following beneficial technical effects: 1. Multiple groups of cleaning and decomposition components are arranged in a circular shape along the inner wall of the lower shell, and the swinging wiping friction plate is always in contact with the replaceable filter element through the elastic force of the first spring, and the filter hole and surface of the replaceable filter element are rubbed back and forth to avoid the accumulation of impurities. The swinging of the adsorption ball layer by layer absorbs the residual materials dropped by the upper cleaning and decomposition components when working, and the residual small particles flowing into the filter hole of the replaceable filter element through the flocculent structure on the surface of the adsorption ball. The greater the oil pressure change, the better the cleaning effect, thereby reducing the conditions for the survival of microorganisms; 2. When the replaceable filter element is clogged by particulate matter and the replaceable filter element is not replaced in time, the blocked oil forms oil pressure to push the valve seat upward along the Z axis, the oil inlet and oil outlet oil circuits are opened, and the working medium enters the system through the bypass oil circuit to prevent the oil flow interruption in the system. When the replaceable filter element needs to be replaced, the valve seat, retaining ring, elastic airbag assembly, core shaft and upper shell form a self-sealing device to block the leakage of hydraulic oil and the outflow of the oil outlet; 3. The second folding frame and the first folding frame are folded according to the pressure of the valve seat and the inner wall of the lower shell, and then the first folding frame is pressed against the surface of the core shaft under the limit of the insertion tube and the spring rod, so that the core shaft is clamped stably under the impact of a large oil pressure, avoiding gaps and oil leakage. When the replaceable filter element is replaced, the spring rod uses elasticity to pass through the second folding frame and the first folding frame to press against the valve seat, thereby improving the sealing performance; 4. The plug-in block is inserted into the inner inclined slide block. Since the inner inclined slide block is from high to low from one side of the plug-in block to the other side, the inclined plug-in block is bent under the limit of the arc spring, and then the raised locking block is inserted into the space of the inner inclined slide block. When the upper shell and the lower shell shake, no leakage occurs due to the limit of the positioning type pressure-resistant positioning assembly, and the oil pressure is more stable. There is a counter in the counting pulley. If the counting pulley rotates too many times, it can quickly remind the staff that an oil leakage has occurred. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a low-pressure oil filter purification device for a UAV system of the present invention is given; Figure 2 A schematic diagram of the structure of the upper shell housing cavity block of the present invention is given; Figure 3 A schematic structural diagram of the inner inclined slide block of the present invention is given; Figure 4 A schematic structural diagram of the position-limiting clamping slider of the present invention is given; Figure 5 for Figure 4 Enlarged view of the middle A area; Figure 6 A schematic structural diagram of the mandrel of the present invention is provided; Figure 7 for Figure 6 Enlarged view of the middle B area; Figure 8 A schematic structural diagram of the cleaning and decomposition assembly of the present invention is provided; Fig. 9 A schematic structural diagram of a replaceable filter element of the present invention is given.

[0020] Figure numerals: 1, shell assembly; 101, upper shell; 102, input pipe; 103, output pipe; 2, built-in filter assembly; 201, lower shell; 202, cleaning hole; 203, replaceable filter element; 204, core shaft; 205, retaining ring; 206, valve seat; 3, positioning pressure-resistant positioning assembly; 301, positioning slide cavity frame; 302, fixed clamping block; 303, rope insertion base; 304, limit sliding rope; 305, lower shell cavity block; 306, limit clamping slider; 307, inner inclined slide block; 308, plug-in block; 309, inclined plug-in block; 310, arc Spring; 311, raised snap-fit ​​block; 312, positioning pull rope; 313, counting pulley; 314, upper shell housing cavity block; 315, positioning rod; 316, airbag block; 317, friction pulley; 4, cleaning and disassembling components; 401, bolt positioning block; 402, first spring; 403, limiting snap-fit ​​frame; 404, arc guide block; 405, guide rod; 406, limiting spring; 407, adsorption ball; 408, wiping friction plate; 5, elastic airbag assembly; 501, airbag body; 502, first folding frame; 503, second folding frame; 504, plug-in tube; 505, spring rod. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] like Figure 1-Figure 6 As shown, a low-pressure oil filter purification device for a drone system proposed by the present invention comprises a housing component 1, a built-in filter component 2 is installed at the bottom of the housing component 1, a positioning pressure-resistant positioning component 3 is respectively arranged on both sides of the housing component 1 and the built-in filter component 2, an elastic airbag component 5 is installed inside the housing component 1, and a cleaning and decomposition component 4 is installed inside the built-in filter component 2; The housing assembly 1 comprises an upper housing 101, an input pipe 102 is fixedly mounted on one side of the upper housing 101, and an output pipe 103 is fixedly mounted on the other side of the upper housing 101; The built-in filter assembly 2 includes a lower shell 201 plugged into the bottom of the upper shell 101, a replaceable filter element 203 is installed inside the lower shell 201, a core shaft 204 is installed on the top of the replaceable filter element 203, a retaining ring 205 is fixedly installed inside the upper shell 101, and a valve seat 206 is slidably installed between the retaining ring 205 and the core shaft 204. When the product is working, the valve seat 206, the retaining ring 205, the elastic airbag assembly 5, the core shaft 204 and the upper shell 101 form a bypass valve assembly. When the replaceable filter element 203 is blocked by particulate matter and the replaceable filter element 203 is not replaced in time, the blocked oil forms oil pressure to push the valve seat 206 to move upward along the Z axis, the oil inlet and oil outlet oil circuits are opened, and the working medium enters the system through the bypass oil circuit to prevent the oil flow interruption phenomenon in the system. When the replaceable filter element 203 needs to be replaced, the valve seat 206, the retaining ring 205, the elastic airbag assembly 5, the core shaft 204 and the upper shell 101 form a self-sealing device to block the leakage of hydraulic oil and the outflow of the oil outlet; A process boss is added inside the lower shell 201, which is the location of the cleaning hole 202. There is a 0.5mm gap between the boss and the end cover of the replaceable filter element 203 on one side, which can not only ensure reasonable assembly, but also prevent the filter element from moving on the X-axis and Y-axis. It has a great protective effect in vibration and impact environments and guarantees the service life of the product. The gap between the process boss of the lower shell and the filter element is matched at 0.5mm, and the surface finish of the parts is reasonably designed. This structure is simple, the parts are easy to process, the cost is controlled, and the product can also better adapt to vibration and impact environments; like Figure 1-Figure 9As shown, the positioning type pressure-resistant positioning component 3 includes a positioning type sliding cavity frame 301 fixedly installed inside the UAV, and the interior of the positioning type sliding cavity frame 301 is slidably installed with a lower shell housing cavity block 305 and an upper shell housing cavity block 314, and a group of fixed clamping blocks 302 are fixedly installed on both sides of the upper shell 101. The number of fixed clamping blocks 302 is two groups, and the other group of fixed clamping blocks 302 is fixedly installed on the outside of the lower shell 201, and a rope insertion base 303 is fixedly installed on both sides of the positioning type sliding cavity frame 301. A limited sliding rope 304 is fixedly installed inside the rope insertion base 303, and the upper shell housing cavity block 314 and the lower shell housing cavity block 305 are slidably installed on the outside of the limited sliding rope 304, and the fixed clamping blocks 302 and the inner part of the upper shell housing cavity block 314 are fixedly installed. The limit clamping slider 306 is fixedly installed on one side of the limit clamping slider 306, a positioning rod 315 is fixedly installed on one side of the positioning rod 315, an air bag block 316 is fixedly installed on one side of the positioning rod 315, the limit clamping slider 306 is located inside the lower shell housing cavity block 305 and is fixedly installed with an inner inclined slide block 307 through the air bag block 316, the limit clamping slider 306 is located inside the upper shell housing cavity block 314 and is fixedly installed with an insertion block 308 through the air bag block 316, the outer side of the insertion block 308 is hinged with an inclined insertion block 309 through an arc spring 310, and a protruding snap-fit ​​block 311 is fixedly installed on one side of the inclined insertion block 309, the protruding snap-fit ​​block 311 is arranged in an adaptive state with the inner inclined slide block 307, and the friction pulley 317 is used to realize the lower shell The transmission between the housing cavity block 305 and the airbag block 316 is stable, and the airbag block 316 is used to buffer the external vibration. The outer side of the positioning rod 315 is rotatably installed with a friction pulley 317 that fits the inner wall of the lower shell housing cavity block 305 and the upper shell housing cavity block 314 respectively. A counting pulley 313 is installed inside the positioning slide cavity frame 301. One side of the counting pulley 313 is fixedly installed on the bottom of the lower shell housing cavity block 305 through a positioning pull rope 312, and the other side of the counting pulley 313 is fixedly installed on the bottom of the upper shell housing cavity block 314 through a positioning pull rope 312. When installing the equipment, the counting pulley 313 is rotated by the motor, and the counting pulley 313 drives the lower shell housing cavity block 305 and The upper shell housing cavity block 314 moves toward each other along the guidance of the positioning slide cavity frame 301 and the limiting slide rope 304. During this process, the plug-in block 308 is inserted into the inner inclined slide block 307. Since the inner inclined slide block 307 moves from high to low toward one side of the plug-in block 308, the inclined plug-in block 309 bends under the limitation of the arc spring 310, and then the protruding locking block 311 is inserted into the gap of the inner inclined slide block 307. When the upper shell 101 and the lower shell 201 shake, due to the limitation of the positioning anti-pressure positioning component 3, leakage cannot occur, and the oil pressure is more stable. There is a counter in the counting pulley 313. If the counting pulley 313 rotates too many times, it can quickly remind the staff that an oil leakage event has occurred.

[0023] like Figure 1 and Fig. 9 As shown, the cleaning and decomposition component 4 includes a plurality of bolt positioning blocks 401 fixedly mounted on the inner wall of the lower shell 201, a first spring 402 is fixedly mounted inside the plurality of bolt positioning blocks 401, a limited clamping frame 403 is fixedly mounted on one side of the first spring 402, an arc guide block 404 is fixedly mounted on one side of the limited clamping frame 403, a guide rod 405 is hinged on one side of the arc guide block 404, an adsorption ball 407 is fixedly mounted on one side of the guide rod 405, a wiping friction plate 408 is fixedly mounted on one side of the adsorption ball 407, a limited spring 406 is fixedly mounted at the connection between the arc guide block 404 and the guide rod 405, and the limited spring 406 is arranged in a fitting state with the outer wall of the replaceable filter element 203. If the oil inside the equipment is contaminated by microorganisms, such as bacteria and molds growing in the oil in a humid environment, the low-pressure oil filter cannot effectively prevent the passage of microorganisms and their metabolites, and the oil passing into the lower shell 201 forms an oil pressure , impacting the arc guide block 404, which is controlled according to the size of the oil pressure of the drone, and then the arc guide block 404 drives the adsorption ball 407 and the wiping friction plate 408 to swing back and forth along the replaceable filter element 203 under the elastic limit of the limit spring 406, and since the cleaning and decomposition components 4 are multiple groups, the multiple groups of cleaning and decomposition components 4 are arranged in a circular state along the inner wall of the lower shell 201, and then the swinging wiping friction plate 408 is always in contact with the replaceable filter element 203 through the elastic force of the first spring 402, and the filter hole and surface of the replaceable filter element 203 are rubbed back and forth to avoid the accumulation of impurities, and the swing of the adsorption ball 407, the residual materials dropped by the upper cleaning and decomposition component 4 when working and the small particles contained in the filter hole flowing into the replaceable filter element 203 are adsorbed by the flocculent structure on the surface of the adsorption ball 407 layer by layer, and the greater the oil pressure change, the better the cleaning effect, thereby reducing the conditions for the survival of microorganisms.

[0024] In this embodiment, the elastic airbag assembly 5 includes an airbag body 501 fixedly installed between the valve seat 206 and the lower shell 201, and a second folding frame 503 is fixedly installed on the inner wall of the airbag body 501. The first folding frame 502 is hinged on one side of the second folding frame 503. The second folding frame 503 and the first folding frame 502 are respectively hinged on the inner wall of the input pipe 102 and the inner wall of the valve seat 206. The second folding frame 503 and the first folding frame 502 are centrally provided with two There are two connecting holes, two plug-in tubes 504 are installed between the second folding frame 503 and the first folding frame 502 through the two connecting holes, and a spring rod 505 is fixedly installed between the two plug-in tubes 504. The second folding frame 503 is close to the airbag body 501 and is arranged in a close contact state with the airbag body 501. The first folding frame 502 is arranged in a close contact state with the core shaft 204 in a bent state. When the core shaft 204 is subjected to external oil pressure, the second folding frame 503 and the first folding frame 502 are arranged according to the valve seat 20 6 is folded by the pressure of the inner wall of the lower shell 201, and then the first folding frame 502 is pressed against the surface of the core shaft 204 under the limit of the plug-in tube 504 and the spring rod 505, so that the core shaft 204 is clamped stably under the impact of the large oil pressure to avoid gaps and oil leakage. When the replaceable filter element 203 is replaced, the spring rod 505 uses elasticity to pass through the second folding frame 503 and the first folding frame 502 to press against the valve seat 206, thereby improving the sealing performance. The bottom of the lower shell 201 is provided with a The cleaning hole 202 has a blocking piston inserted inside. When cleaning the equipment, the staff can pull out the blocking piston from the cleaning hole 202. After replacing the filter element, the valve seat 206, the retaining ring 205, the airbag body 501, the core shaft 204 and the upper shell 101 form a self-sealing state to block the leakage of hydraulic oil. The staff can pass the cleaning fluid into the lower shell 201 from the cleaning hole 202, and the cleaning fluid also flows out from the cleaning hole 202 to clean the inside of the lower shell 201, thereby reducing the generation of microorganisms.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. "Comprising" or any other variation thereof is intended to cover non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0026] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A low-pressure oil filter purification device for an unmanned aerial vehicle system, comprising a housing assembly (1), characterized in that: A built-in filter assembly (2) is installed at the bottom of the housing assembly (1), and positioning anti-pressure positioning assemblies (3) are respectively arranged on both sides of the housing assembly (1) and the built-in filter assembly (2); an elastic airbag assembly (5) is installed inside the housing assembly (1), and a cleaning and decomposition assembly (4) is installed inside the built-in filter assembly (2); The housing assembly (1) comprises an upper housing (101), an input pipe (102) being fixedly mounted on one side of the upper housing (101), and an output pipe (103) being fixedly mounted on the other side of the upper housing (101); The built-in filter assembly (2) comprises a lower shell (201) plugged into the bottom of the upper shell (101); a replaceable filter element (203) is installed inside the lower shell (201); a core shaft (204) is installed on the top of the replaceable filter element (203); a retaining ring (205) is fixedly installed inside the upper shell (101); a valve seat (206) is slidably installed between the retaining ring (205) and the core shaft (204); The cleaning and disassembly assembly (4) comprises a plurality of groups of bolt positioning blocks (401) fixedly mounted on the inner wall of the lower shell (201), a first spring (402) fixedly mounted inside the plurality of groups of bolt positioning blocks (401), a limited clamping frame (403) fixedly mounted on one side of the first spring (402), an arc-shaped guide block (404) fixedly mounted on one side of the limited clamping frame (403), a guide rod (405) hingedly connected to one side of the arc-shaped guide block (404), an adsorption ball (407) fixedly mounted on one side of the guide rod (405), a wiping friction plate (408) fixedly mounted on one side of the adsorption ball (407), a limited spring (406) fixedly mounted at the connection between the arc-shaped guide block (404) and the guide rod (405), and the limited spring (406) is arranged in a state of being in contact with the outer wall of the replaceable filter element (203).

2. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 1 is characterized in that: The elastic airbag assembly (5) comprises an airbag body (501) fixedly mounted between a valve seat (206) and a lower shell (201); a second folding frame (503) is fixedly mounted on the inner wall of the airbag body (501); a first folding frame (502) is hingedly mounted on one side of the second folding frame (503); and the connecting parts of the second folding frame (503) and the first folding frame (502) on both sides are hingedly mounted on the inner wall of the input pipe (102) and the inner wall of the valve seat (206), respectively.

3. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 2 is characterized in that: Two connection holes are provided at the center of the second folding frame (503) and the first folding frame (502); two plug-in tubes (504) are installed between the second folding frame (503) and the first folding frame (502) via the two connection holes; a spring rod (505) is fixedly installed between the two plug-in tubes (504).

4. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 1 is characterized in that: The second folding frame (503) is arranged in a state of being fitted to the airbag body (501) on a side close to the airbag body (501), and the first folding frame (502) is arranged in a state of being fitted to the core shaft (204) in a bent state.

5. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 3 is characterized in that: A cleaning hole (202) is provided at the bottom of the lower shell (201), and a blocking piston is inserted into the inside of the cleaning hole (202).

6. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 1 is characterized in that: The positioning type pressure-resistant positioning assembly (3) comprises a positioning type sliding cavity frame (301) fixedly mounted inside the drone, wherein a lower shell housing cavity block (305) and an upper shell housing cavity block (314) are slidably mounted inside the positioning type sliding cavity frame (301).

7. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 6 is characterized in that: A group of fixed clamping blocks (302) are fixedly mounted on both sides of the upper shell (101), the number of the fixed clamping blocks (302) being two groups, and the other group of fixed clamping blocks (302) is fixedly mounted on the outside of the lower shell (201).

8. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 7, characterized in that: Rope insertion bases (303) are fixedly installed on both sides of the positioning slide cavity frame (301), a limited slide rope (304) is fixedly installed inside the rope insertion base (303), and the upper shell housing cavity block (314) and the lower shell housing cavity block (305) are slidably installed on the outside of the limited slide rope (304).

9. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 8, characterized in that: A limited clamping slider (306) is fixedly installed inside the fixed clamping block (302) and the upper shell housing cavity block (314), a positioning rod (315) is fixedly installed on one side of the limited clamping slider (306), an airbag block (316) is fixedly installed on one side of the positioning rod (315), and the limited clamping slider (306) is located inside the lower shell housing cavity block (305) and is fixedly installed with an inner inclined slide block (306) through the airbag block (316). 7), the limit clamping slider (306) is located inside the upper shell housing cavity block (314) and is fixedly mounted with an insertion block (308) via an airbag block (316); an outer side of the insertion block (308) is hinged with an inclined insertion block (309) via an arc spring (310); a protruding snap-fit ​​block (311) is fixedly mounted on one side of the inclined insertion block (309); the protruding snap-fit ​​block (311) is arranged in an adaptive state with the inner inclined slide block (307).

10. The low-pressure oil filter purification equipment for an unmanned aerial vehicle system according to claim 9, characterized in that: A friction pulley (317) is rotatably mounted on the outer side of the positioning rod (315) and is respectively fitted to the inner walls of the lower shell housing cavity block (305) and the upper shell housing cavity block (314). A counting pulley (313) is mounted inside the positioning slide cavity frame (301). One side of the counting pulley (313) is fixedly mounted on the bottom of the lower shell housing cavity block (305) via a positioning pull rope (312), and the other side of the counting pulley (313) is fixedly mounted on the bottom of the upper shell housing cavity block (314) via a positioning pull rope (312).

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