Air inlet device of explosion-proof diesel engine

Abstract

The utility model belongs to the technical field of diesel engines, and particularly relates to an air inlet device of an explosion-proof diesel engine. The device comprises a shell, an air inlet is formed in the top of the shell, a fixed pipe is arranged in the shell, a net pipe is arranged at the bottom of the fixed pipe, a metal filter screen is arranged between the net pipe and the bottom of the fixed pipe and the shell, and an air inlet pipe is arranged at the top of the side wall of the shell; a collecting groove is formed in the net pipe, a movable block is arranged in the collecting groove, a connecting mechanism for limiting movement of the movable block is arranged on the collecting groove, and a fixing rod is fixed to the top of the movable block; a through hole is formed in the bottom of the fixing pipe, a push rod is vertically fixed to the top of the collecting groove, and a limiting block is fixed to the inner side wall of the fixing pipe. According to the design, the movable block and the collecting groove are pulled upwards through the fixing rod, the top end of the collecting groove is aligned with the through hole, then the movable block independently moves upwards to push out engine oil in the collecting groove, the engine oil is injected into the metal filter screen again, and early-stage maintenance is facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of diesel engine technology, and in particular relates to an explosion-proof diesel engine air intake device. Background Technology

[0002] An explosion-proof diesel engine is a type of diesel engine specifically designed for potentially explosive environments. It possesses explosion-proof performance and can operate safely in environments containing flammable gases, vapors, or dust without causing an explosion. Explosion-proof diesel engines play a crucial role in high-risk environments, especially in the coal mining and chemical industries, where their importance is increasingly prominent. However, because diesel engines themselves have high requirements for intake air cleanliness, an air filter is generally installed at the front end of the intake manifold. In dusty environments, this air filter is prone to clogging due to dust, leading to increased intake resistance, reduced power, and the need for frequent maintenance.

[0003] The current air filter at the intake of diesel engines consists of two housings, an upper and an lower one. The intake is located at the top of the upper housing. Both housings contain annular metal fiber meshes. Engine oil is then poured onto the meshes, and the oil film helps to trap dust. The meshes can be cleaned and reused, resulting in low maintenance costs.

[0004] However, in actual use, after pouring the engine oil onto the metal mesh, the oil flows downwards, causing it to accumulate at the bottom over time. This affects the oil's ability to absorb dust from the air, necessitating regular maintenance. Maintenance requires disassembling the upper and lower housings. Since there is enough oil inside, it simply accumulates at the bottom and initially flows there without absorbing dust, resulting in a low dust content. To improve resource utilization, the oil is poured back onto the metal mesh. Later, when the oil content becomes higher, the oil in the metal mesh is replaced. Therefore, initial maintenance simply involves disassembling the housings and pouring the oil back onto the metal mesh to absorb airborne impurities, a rather cumbersome process. Utility Model Content

[0005] The purpose of this utility model is to provide an explosion-proof diesel engine intake device that facilitates the refilling of engine oil from the housing onto a metal mesh, thereby simplifying initial maintenance.

[0006] The explosion-proof diesel engine air intake device includes a housing, an air intake port at the top of the housing, a fixed pipe vertically arranged inside the housing, the fixed pipe being connected to the air intake port at the top of the housing, a mesh pipe with a mesh structure vertically arranged at the bottom of the fixed pipe, a metal filter screen being arranged between the mesh pipe and the fixed pipe and the inner side wall of the housing, and an air intake pipe being arranged at the top of the side wall of the housing, the air intake pipe being connected to the housing.

[0007] The network management system has an independently installed collection trough with the slot opening facing upwards. The collection trough has an independently installed movable block. The collection trough is equipped with a connecting mechanism that restricts the individual movement of the movable block. The top of the movable block is vertically fixed with a fixing rod.

[0008] The bottom of the fixed tube has several through holes that are connected internally and externally and located at the same horizontal level. The height of the through holes is lower than the height of the top of the metal filter screen. A push rod is vertically fixed at the top of the collection tank. A limiting block is fixed on the inner side wall of the fixed tube above the through holes to block the push rod. When the push rod contacts the limiting block, the top of the collection tank is flush with the through holes.

[0009] Furthermore, the housing includes a lower housing and an upper housing, with the air inlet located at the top of the upper housing. Both the lower and upper housings are circular and are threaded together.

[0010] Furthermore, the diameter of the outer side wall at the top of the lower housing is the same as the diameter of the inner side wall at the bottom of the upper housing. The outer side wall at the top of the lower housing is provided with external threads, and the inner side wall at the bottom of the upper housing is provided with internal threads. A first sealing ring is provided between the top of the lower housing and the upper housing.

[0011] Furthermore, the top of the lower housing is provided with an installation groove for embedding the first sealing ring, and the depth of the installation groove is less than the thickness of the first sealing ring.

[0012] Furthermore, the fixing tube and the upper shell are independent of each other. A second sealing ring is provided between the top of the fixing tube and the inner top of the upper shell. A limiting tube is fitted on the top of the fixing tube and fixed to the inner top of the upper shell. Several support rods are horizontally fixed on the side wall of the fixing tube.

[0013] Furthermore, a connecting pipe is vertically fixed to the top of the upper housing, the air inlet is located inside the connecting pipe, and a groove with the opening facing downwards is provided above the connecting pipe;

[0014] The top end of the connecting pipe is fitted with a threaded sleeve, which is fixed to the inner wall of the tank by several connecting rods, and the top end of the fixing rods extends beyond the connecting pipe.

[0015] Furthermore, the connecting mechanism includes an internal thread formed on the inner sidewall of the collection tank, the movable block is a circular block, and the sidewall of the movable block is provided with an external thread;

[0016] When the collecting trough contacts the inner bottom of the lower housing and the movable block is located at the inner bottom of the collecting trough, after the trough is installed at the top of the connecting pipe, the height of the top of its fixing rod is consistent with the height of the bottom of the trough inside the trough.

[0017] Furthermore, a ring-shaped pad is fixed to the inner bottom of the lower housing, and there is a gap between the pad and the mesh tube.

[0018] Furthermore, the fixed tube has an annular groove in the thickness direction to connect the through holes. The thickness of the annular groove is less than the thickness of the fixed tube, and the annular groove has sidewalls.

[0019] An annular baffle with an annular structure is independently installed inside the annular groove, and a first sliding groove for the baffle to slide up and down is opened on the fixed tube above the through hole;

[0020] A slider is fixed to the top of the inner wall of the first sliding baffle. A second sliding groove is provided on the fixed tube for the slider to pass through and slide up and down. The end of the slider that extends beyond the second sliding groove blocks the push rod. When the push rod pushes the slider upward and contacts the limiting block, the top of the collecting groove is flush with the through hole.

[0021] Furthermore, the limiting block is a ring structure, and a guide block is fixed on the outer wall of the fixed tube corresponding to the through hole. The horizontal height of the guide block is lower than the horizontal height of the through hole.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention uses a collection tank to collect engine oil flowing into the bottom of the housing. When all the engine oil in the metal filter has flowed into the bottom of the housing, maintenance can be performed by pulling the movable block and the collection tank upwards using a fixed rod. After the push rod and the limit block come into contact, the top of the collection tank aligns with the through hole. Then, the movable block moves upwards independently, pushing out the engine oil in the collection tank and allowing it to be re-injected into the metal filter, facilitating early maintenance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0026] Figure 3 This is another structural schematic diagram of the present invention;

[0027] Figure 4 for Figure 3 Enlarged structural diagram at point B;

[0028] The components in the diagram are named as follows: 1. Housing; 1.1. Lower Housing; 1.2. Upper Housing; 2. Fixing Tube; 2.1. Through Hole; 2.2. First Slide Groove; 2.3. Second Slide Groove; 3. Limiting Tube; 4. Groove Body; 5. Connecting Tube; 6. Sleeve; 7. Second Sealing Ring; 8. Fixing Rod; 9. Air Inlet Pipe; 10. First Sealing Ring; 11. Metal Filter Screen; 12. Limiting Block; 13. Guide Block; 14. Mesh Tube; 15. Push Rod; 16. Movable Block; 17. Collection Groove; 18. Baffle; 19. Slider. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0030] This embodiment describes an explosion-proof diesel engine air intake device, such as... Figure 1 and Figure 2 As shown, the device includes a housing 1. An air inlet is located at the top of the housing 1. A fixed pipe 2 is vertically installed inside the housing 1, connected to the air inlet at the top of the housing 1. A mesh tube 14 with a mesh structure is vertically installed at the bottom of the fixed pipe 2. A metal filter 11 is installed between the mesh tube 14, the fixed pipe 2, and the inner wall of the housing 1. The metal filter 11 has a ring structure and is composed of fine metal wires. The metal filter 11 is the same metal wire filter used in existing diesel engine air filters. Air entering from the air inlet at the top of the housing 1 is fed through the fixed pipe 2 to the inner bottom of the housing 1, and then enters the metal filter 11 through the mesh tube 14. An air inlet pipe 9 is located at the top of the side wall of the housing 1. An internal and external communication channel is opened at the top of the side wall of the housing 1, connecting the air inlet pipe 9 and the housing 1.

[0031] A collection trough 17 with its opening facing upwards is independently provided inside the mesh tube 14. The inner diameter of the mesh tube 14 is the same as the inner diameter of the fixed tube 2. The collection trough 17 has a circular structure. The diameter of the outer wall of the collection trough 17 is slightly smaller than the inner diameter of the mesh tube 14, so that the collection trough 17 can move up and down inside the mesh tube 14 and the fixed tube 2. A movable block 16 is independently provided inside the collection trough 17. A fixed rod 8 is vertically fixed to the top of the movable block 16. The top of the fixed rod 8 extends beyond the top of the housing 1.

[0032] The bottom of the fixed tube 2 has several through holes 2.1 that are connected internally and externally and located at the same horizontal level. The height of the through holes 2.1 is lower than the height of the top of the metal filter screen 11, so that the air passing through the through holes 2.1 enters the metal filter screen 11. The top of the collection tank 17 is vertically fixed with a push rod 15. The inner wall of the fixed tube 2 above the through holes 2.1 is fixed with a limiting block 12 to block the push rod 15. When the push rod 15 contacts the limiting block 12, the top of the collection tank 17 is flush with the through hole 2.1, and the limiting block 12 plays a positioning role.

[0033] The housing 1 includes a lower housing 1.1 and an upper housing 1.2. The housing 1 has an overall circular structure, and the air inlet is located on the top of the upper housing 1.2. The lower housing 1.1 and the upper housing 1.2 are circular in structure and are threaded together. The threaded connection between the lower housing 1.1 and the upper housing 1.2 facilitates the disassembly of the housing 1, thereby making it easy to clean the metal filter screen 11 and change the engine oil after long-term use.

[0034] The diameter of the outer side wall at the top of the lower housing 1.1 is the same as the diameter of the inner side wall at the bottom of the upper housing 1.2. The thickness of the top of the lower housing 1.1 is less than the thickness of other parts, and the inner side wall diameter of the lower housing 1.1 is the same. The thickness of the bottom of the upper housing 1.2 is the same as the thickness of other parts, and the outer side wall diameter of the upper housing 1.2 is the same. The outer side wall at the top of the lower housing 1.1 has an external thread, and the inner side wall at the bottom of the upper housing 1.2 has an internal thread. Thus, after the lower housing 1.1 and the upper housing 1.2 are threaded together, the inner side wall of the lower housing 1.1 and the inner side wall of the upper housing 1.2 are... The outer side wall of the lower housing 1.1 is flush with the outer side wall of the upper housing 1.2. A first sealing ring 10 is provided between the top of the lower housing 1.1 and the upper housing 1.2. The first sealing ring 10 can reduce the amount of outside air entering the interior from the connection between the lower housing 1.1 and the upper housing 1.2. Of course, in some embodiments, the inner diameter of the upper housing 1.2 can be the same as the outer diameter of the lower housing 1.1. An external thread is provided on the outer side wall of the top of the lower housing 1.1, and an internal thread is provided on the bottom of the inner side wall of the upper housing 1.2. The lower housing 1.1 and the upper housing 1.2 are threadedly connected.

[0035] The top of the lower housing 1.1 is provided with an installation groove for embedding the first sealing ring 10. The width of the first sealing ring 10 is less than the thickness of the top of the lower housing 1.1, and the depth of the installation groove is less than the thickness of the first sealing ring 10. When the lower housing 1.1 and the upper housing 1.2 are connected, the displacement of the first sealing ring 10 can be reduced by inserting it into the installation groove, thereby facilitating the connection between the lower housing 1.1 and the upper housing 1.2.

[0036] The fixed tube 2 and the upper housing 1.2 are independent of each other. A second sealing ring 7 is provided between the top of the fixed tube 2 and the inner top of the upper housing 1.2. The second sealing ring 7 can prevent air in the fixed tube 2 from directly entering the space between the fixed tube 2 and the inner wall of the upper housing 1.2 from the connection between the top of the fixed tube 2 and the top of the upper housing 1.2. The top of the fixed tube 2 is fitted with a limiting tube 3, which is fixed to the inner top of the upper housing 1.2. The limiting tube 3 can restrict the position of the fixed tube 2. Several support rods are horizontally fixed on the side wall of the fixed tube 2. The support rods are in contact with the inner wall of the upper housing 1.2 and are located at the bottom of the outer side wall of the fixed tube 2. The support rods and the limiting tube 3 can position the fixed tube 2 in the upper housing 1.2, reduce the displacement of the fixed tube 2 in the upper housing 1.2, and make it easier for the fixed tube 2 to be aligned with the air inlet at the top of the upper housing 1.2.

[0037] A connecting pipe 5 is vertically fixed to the top of the upper housing 1.2. The air inlet is located inside the connecting pipe 5, and the inner diameter of the connecting pipe 5 is the same as the diameter of the air inlet. A groove 4 with its opening facing downwards is provided above the connecting pipe 5. The groove 4 has a circular structure, and the diameter of the outer wall of the groove 4 is the same as the outer diameter of the upper housing 1.2. A sleeve 6 with a threaded fit is fitted to the top of the connecting pipe 5. The outer wall of the connecting pipe 5 has external threads, and the inner wall of the sleeve 6 has internal threads, so that the sleeve 6 and the connecting pipe 5 can be detachably connected. The sleeve 6 is connected to the inner side of the groove 4 through several connecting rods. The wall is fixed, and the top of the connecting pipe 5 and the top of the air inlet can be blocked by the groove 4, thereby preventing some debris from entering the housing 1 through the air inlet. The connecting pipe 5 creates a gap between the groove 4 and the top of the upper housing 1.2. Air can enter the groove 4 through the connecting rod and then enter the connecting pipe 5. The top of the fixing rod 8 extends beyond the connecting pipe 5. To facilitate operation of the fixing rod 8, a handle is horizontally fixed at the top of the fixing rod 8, which makes it easy to rotate the fixing rod 8 and pull the fixing rod 8 upward.

[0038] The inner wall of the collection trough 17 is provided with internal threads, and the movable block 16 is a circular block with external threads on its side wall, so that the movable block 16 and the collection trough 17 are threadedly engaged. When the collection trough 17 is in contact with the inner bottom of the lower housing 1.1 and the movable block 16 is located at the inner bottom of the collection trough 17, the trough 4 is installed at the top of the connecting pipe 5, and the height of the top of its fixing rod 8 is consistent with the height of the bottom of the trough 4. After maintenance, when the collection trough 17 and the movable block 16 are put back into the housing 1, the reset of the movable block 16 can be checked. If the movable block 16 is not at the bottom in the collection trough 17, its horizontal height in the collection trough 17 is relatively high, and the top of its fixing rod 8 will rise a bit. Thus, when the trough 4 is installed at the top of the connecting pipe 5, the fixing rod 8 will push against the trough 4. This section as a whole constitutes a connecting mechanism that restricts the movable block 16 from moving independently in the collection trough 17.

[0039] Of course, in some embodiments, the connecting mechanism may also have an insert block fixed to the side wall of the movable block 16, and a third sliding groove for the collection groove 17 to be inserted and rotated horizontally is provided at the bottom of the inner side wall of the collection groove 17. A fourth sliding groove for the insert block to slide up and down is provided on the inner side wall of the collection groove 17 corresponding to the third sliding groove. The top of the fourth sliding groove is lower than the top of the collection groove 17. When the insert block is located in the third sliding groove, the upward movement of the movable block 16 can be restricted. When the movable block 16 is to be pulled up, the movable block 16 is rotated so that the insert block is located in the fourth sliding groove. Thus, the movable block 16 moves upward in the collection groove 17 by sliding the insert block upward. The top of the fourth sliding groove does not exceed the collection groove 17, which can prevent the movable block 16 from falling out of the collection groove 17. Of course, two or three insert blocks are provided and are evenly fixed to the side wall of the movable block 16.

[0040] The bottom of the lower housing 1.1 is fixed with a ring-shaped pad, and there is a gap between the pad and the mesh tube 14. The pad can reduce the space at the bottom of the lower housing 1.1. The gap between the pad and the mesh tube 14 allows the oil to settle at the bottom of the lower housing 1.1 before overflowing into the collection tank 17 when there is too much oil.

[0041] like Figure 3 and Figure 4As shown, the fixed tube 2 has an annular groove in its thickness direction that connects to the through hole 2.1. The thickness of the annular groove is less than the thickness of the fixed tube 2, giving the annular groove a sidewall. A baffle 18 with an annular structure is independently installed inside the annular groove. A first sliding groove 2.2 for the baffle 18 to slide up and down is provided on the fixed tube 2 above the through hole 2.1. To facilitate the opening of the annular groove, the first sliding groove 2.2, and the second sliding groove 2.3, the fixed tube 2 can be divided into upper and lower tubes with the through hole 2.1 as the center. The through hole 2.1 is opened at the top of the lower tube, and the annular groove is opened at the top of the lower tube, with the annular groove located in the middle of the thickness of the lower tube. The first sliding groove 2.2 and the second sliding groove 2.3 are opened at the bottom of the upper tube. After the annular groove, the first sliding groove 2.2, and the second sliding groove 2.3 are opened, the lower tube and the upper tube are fixed to form the fixed tube 2. A slider 1 is fixed to the top of the inner sidewall of the first sliding baffle 18. 9. Several sliders 19 can be fixed and evenly distributed along the inner wall of the baffle 18. The fixed tube 2 has a second groove 2.3 for the sliders 19 to pass through and slide up and down. The end of the slider 19 that extends beyond the second groove 2.3 blocks the push rod 15. That is, the slider 19 is located directly below the limiting block 12. When the push rod 15 pushes the slider 19 upward to contact the limiting block 12, the top of the collecting groove 17 is flush with the through hole 2.1. In the natural state, the baffle 18 blocks the through hole 2.1, thereby reducing the small amount of air in the fixed tube 2 from directly entering the metal filter screen 11 through the through hole 2.1. When the collecting groove 17 is pulled upward by the fixed rod 8, the push rod 15 will push the slider 19 upward, thereby causing the slider 19 to drive the baffle 18 to move upward, thereby opening the through hole 2.1 and allowing the oil in the collecting groove 17 to enter the metal filter screen 11 through the through hole 2.1.

[0042] The limiting block 12 has a ring structure, which facilitates contact between the slider 19 and the push rod 15 and the limiting block 12, reducing the positioning accuracy. Corresponding to the through hole 2.1, a guide block 13 is fixed on the outer wall of the fixed tube 2. The horizontal height of the guide block 13 is lower than the horizontal height of the through hole 2.1. The top of the guide block 13 is an inclined surface, with the side closer to the fixed tube 2 being higher. The guide block 13 can guide the oil flowing out of the through hole 2.1 into the interior of the metal filter screen 11, thereby preventing the oil from flowing directly along the outer wall of the fixed tube 2. Of course, in order to allow the oil to enter the interior of the metal filter screen 11 through the guide block 13, a guide groove can also be opened on the top of the guide block 13 to allow more oil to flow into the interior of the metal filter screen 11. Of course, in order to reduce the impact of the guide block 13 on the removal of the metal filter screen 11, the metal filter screen 11 can be divided into two, one located below the guide block 13 and the other located above the guide block 13.

[0043] The working principle and technical effects of this embodiment:

[0044] In use, engine oil is poured onto the metal filter screen 11. Then, the housing 1 and intake pipe 9 are installed on the diesel engine. Outside air enters the connecting pipe 5 through the trough 4, then through the fixed pipe 2 into the mesh pipe 14, and then through the mesh pipe 14 into the metal filter screen 11. The air is filtered by the metal filter screen 11, and the engine oil on the metal filter screen 11 adsorbs particulate impurities in the air. The filtered air then enters the cavity between the fixed pipe 2 and the housing 1 above the metal filter screen 11, and then enters the intake pipe 9. Of course, in order to increase the intake pressure and density of the engine, thereby increasing the engine's power and efficiency, a turbocharger and intercooler are installed on the intake pipe 9. During use, the engine oil in the metal filter screen 11 flows downward and accumulates at the bottom of the housing 1. After settling, the engine oil enters the collection tank 17. When the oil level in the metal filter 11 is low and maintenance is required, remove the tank 4, and then pull the collection tank 17 and the movable block 16 upwards using the fixing rod 8. When the push rod 15 is blocked by the limit block 12, the top of the collection tank 17 aligns with the through hole 2.1. Then, rotate the movable block 16 using the fixing rod 8 to move the movable block 16 upwards within the collection tank 17, thereby pushing out the oil in the collection tank 17. The oil then enters the metal filter 11 through the through hole 2.1 and the guide block 13. This eliminates the need to open the housing 1 or remove the metal filter 11, allowing the oil to be refilled into the metal filter 11 in the early stages, facilitating initial maintenance. When the oil has been used for a long time and the particle content is high, the housing 1 can be opened, the metal filter 11 removed for cleaning, and the oil replaced.

Claims

1. An explosion-proof air intake device for a diesel engine, comprising a housing (1), the top of the housing (1) being provided with an air inlet, characterized in that: A fixed pipe (2) is vertically arranged inside the housing (1). The fixed pipe (2) is connected to the air inlet at the top of the housing (1). A mesh pipe (14) with a mesh structure is vertically arranged at the bottom of the fixed pipe (2). A metal filter screen (11) is arranged between the mesh pipe (14) and the fixed pipe (2) and the inner side wall of the housing (1). An air inlet pipe (9) is arranged at the top of the side wall of the housing (1). The air inlet pipe (9) is connected to the housing (1). The network tube (14) is independently equipped with a collection trough (17) with the slot opening facing upward. The collection trough (17) is independently equipped with a movable block (16). The collection trough (17) is equipped with a connecting mechanism that restricts the movement of the movable block (16) alone. The top of the movable block (16) is vertically fixed with a fixing rod (8). The bottom of the fixed tube (2) has several through holes (2.1) that are connected inside and out and located at the same horizontal level. The height of the through holes (2.1) is lower than the height of the top of the metal filter screen (11). The top of the collection tank (17) is vertically fixed with a push rod (15). The inner wall of the fixed tube (2) above the through hole (2.1) is fixed with a limiting block (12) to block the push rod (15). When the push rod (15) contacts the limiting block (12), the top of the collection tank (17) is flush with the through hole (2.1).

2. The explosion-proof diesel engine air intake device of claim 1, wherein: The housing (1) includes a lower housing (1.1) and an upper housing (1.2). The air inlet is located on the top of the upper housing (1.2). The lower housing (1.1) and the upper housing (1.2) are circular structures and are threaded together.

3. The explosion-proof diesel engine air intake device of claim 2, wherein: The diameter of the outer side wall at the top of the lower housing (1.1) is the same as the diameter of the inner side wall at the bottom of the upper housing (1.2). The outer side wall at the top of the lower housing (1.1) is provided with external threads, and the inner side wall at the bottom of the upper housing (1.2) is provided with internal threads. A first sealing ring (10) is provided between the top of the lower housing (1.1) and the upper housing (1.2).

4. The explosion-proof diesel engine air intake device of claim 3, wherein: The top of the lower housing (1.1) is provided with an installation groove for embedding the first sealing ring (10), and the depth of the installation groove is less than the thickness of the first sealing ring (10).

5. The explosion-proof diesel engine air intake device of claim 4, wherein: The fixed tube (2) and the upper shell (1.2) are independent of each other. A second sealing ring (7) is provided between the top of the fixed tube (2) and the inner top of the upper shell (1.2). A limiting tube (3) is fitted on the top of the fixed tube (2). The limiting tube (3) is fixed to the inner top of the upper shell (1.2). Several support rods are horizontally fixed on the side wall of the fixed tube (2).

6. The explosion-proof diesel engine air intake device of claim 5, wherein: The top of the upper housing (1.2) is vertically fixed with a connecting pipe (5), the air inlet is located inside the connecting pipe (5), and a groove (4) with the slot facing downward is provided above the connecting pipe (5). The top end of the connecting pipe (5) is fitted with a sleeve (6) that is threaded to it. The sleeve (6) is fixed to the inner wall of the groove (4) by several connecting rods, and the top end of the fixing rod (8) extends beyond the connecting pipe (5).

7. The explosion-proof diesel engine air intake device of claim 6, wherein: The connecting mechanism includes an internal thread on the inner wall of the collection groove (17), and the movable block (16) is a circular block with an external thread on the side wall of the movable block (16). When the collecting trough (17) contacts the inner bottom of the lower housing (1.1) and the movable block (16) is located at the inner bottom of the collecting trough (17), after the trough (4) is installed at the top of the connecting pipe (5), the height of the top of its fixing rod (8) is consistent with the height of the bottom of the trough (4).

8. The explosion-proof diesel engine air intake device of claim 7, wherein: The bottom of the lower housing (1.1) is fixed with a ring-shaped pad, and there is a gap between the pad and the mesh tube (14).

9. The explosion-proof diesel engine air intake device of claim 8, wherein: The fixed tube (2) has an annular groove in the thickness direction to connect the through hole (2.1). The thickness of the annular groove is less than the thickness of the fixed tube (2), and the annular groove has a side wall. An annular baffle (18) with an annular structure is independently installed in the annular groove, and a first sliding groove (2.2) for the baffle (18) to slide up and down is opened on the fixed tube (2) above the through hole (2.1). A slider (19) is fixed to the top of the inner side wall of the first sliding baffle (18). A second sliding groove (2.3) is provided on the fixed tube (2) for the slider (19) to pass through and slide up and down. The end of the slider (19) that extends beyond the second sliding groove (2.3) blocks the push rod (15). When the push rod (15) pushes the slider (19) upward to contact the limiting block (12), the top of the collecting groove (17) is flush with the through hole (2.1).

10. The explosion-proof diesel engine air intake device of claim 9, wherein: The limiting block (12) is a ring structure. A guide block (13) is fixed on the outer wall of the fixed tube (2) corresponding to the through hole (2.1). The horizontal height of the guide block (13) is lower than the horizontal height of the through hole (2.1).

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