Air prefilter with unified pressing and sealing structure of upper and lower coarse filter discs and dust collection cavity

Abstract

The utility model discloses an air prefilter with a unified compression sealing structure of upper and lower coarse filter discs and a dust collection cavity. The air prefilter comprises the upper and lower coarse filter discs, an upper shell and the dust collection cavity, an air outlet cavity is defined by the upper coarse filter disc and the upper shell upwards; the center of the lower coarse filter disc is connected with a central pipe; a plurality of rotational flow pipe assemblies are connected between the upper rough filter disc and the lower rough filter disc, inner and outer annular sealing rings are arranged between the inner and outer circumferential side walls of the dust collection cavity and the lower rough filter disc in an upward pressing mode, and screw rod connecting assemblies are arranged among the upper rough filter disc, the lower rough filter disc and the bottom wall of the dust collection cavity; the screw connecting assembly is positioned between the outer wall of the central pipe and the outer circumferential surface of the lower coarse filter disc in the radial direction; the multiple screw rod connecting assemblies are evenly arranged in the circumferential direction. According to the utility model, the number of parts required for connection is obviously reduced, the cost of the parts is reduced, the assembly efficiency is improved, the radial size of a required mounting space is reduced, and more uniform pressing force can be applied to the inner and outer annular sealing rings.

Description

Technical Field

[0001] The utility model relates to an air pre-filter for a motor vehicle. Background Art

[0002] Construction machinery and agricultural machinery vehicles often work in places with heavy air pollution, and the air filter has a heavy workload. If the pre-filter function is not added, the service life of the air filter will be greatly shortened, and the air filter needs to be frequently maintained or replaced, which increases the cost of use and is also very inconvenient. Therefore, air pre-filters have become a must-have device for such vehicles.

[0003] like Fig. 9 As shown, and refer to Figures 1 to 8 (Main reference Figure 2 and Figure 3 ), the company's existing air pre-filter products include an upper coarse filter disc 1 and a lower coarse filter disc 2 arranged at intervals from top to bottom. The upper coarse filter disc 1 and the lower coarse filter disc 2 are connected by a number of vertically arranged tie rods. The upper coarse filter disc 1 is upwardly connected to the upper shell 3, and the lower coarse filter disc 2 is downwardly connected to the dust collecting chamber through the clamping claw 5. The fixed end of the clamping claw 5 is fixed on the outer circumferential side wall of the dust collecting chamber, and the rotating clamping end of the clamping claw 5 is used to clamp the lower coarse filter disc 2 upward. The upper coarse filter disc 1 and the upper shell 3 form an air outlet cavity 6 upward; the center of the upper coarse filter disc 1 is connected to a central tube 10, the upper end of the central tube 10 is communicated with the air outlet cavity 6, and the lower end of the central tube 10 extends out of the lower coarse filter disc 2 and the dust outlet cavity and is used to communicate with the air inlet of the motor vehicle air filter. The central tube 10 and the lower coarse filter disc 2 are integrally formed components.

[0004] A cylindrical air intake filter 7 is connected between the outer peripheries of the upper coarse filter disc 1 and the lower coarse filter disc 2;

[0005] A plurality of swirl tube assemblies 8 are connected between the upper coarse filter plate 1 and the lower coarse filter plate 2. An air inlet cavity 9 is formed between the air inlet filter screen 7, the upper coarse filter plate 1 and the lower coarse filter plate 2. The air inlet of each swirl tube assembly 8 is located in the middle of the swirl tube assembly 8 in the vertical direction and is connected to the air inlet cavity 9. The air outlet of each swirl tube assembly 8 is connected to the air outlet cavity 6 upward, and the dust outlet of each swirl tube assembly 8 is connected to the dust collection cavity downward. When the air pre-filter is working, the ambient air enters the air inlet cavity 9 through the air inlet filter screen 7, and then enters each swirl tube assembly 8 for pre-filtration. The dust after pre-filtration falls into the dust collection cavity. The air after pre-filtration flows to the air filter of the motor vehicle through the air outlet cavity and the central tube 10.

[0006] The dust collecting chamber has an inner circumferential side wall 11 adjacent to the central tube 10 and an outer circumferential side wall 12 corresponding to the upper and lower air intake filter screen 7. An outer annular sealing ring 13 is provided between the outer circumferential side wall 12 and the lower coarse filter plate 2, and an inner annular sealing ring 14 is provided between the inner circumferential side wall 11 and the lower coarse filter plate 2. The outer annular sealing ring 13 is used to prevent the circumferential sealing of the outer top of the dust collecting chamber from being loose, and the inner annular sealing ring 14 is used to prevent the circumferential sealing of the inner top of the dust collecting chamber from being loose. Any loose sealing will lead to a decrease in the pre-filtering effect of the air pre-filter.

[0007] The shortcomings of the above existing structures are:

[0008] 1. The upper coarse filter plate 1 and the lower coarse filter plate 2 are connected by a tie rod, and the lower coarse filter plate 2 is connected to the dust collecting chamber by a claw 5. A plurality of tie rods and claws 5 need to be evenly arranged in the circumferential direction to apply a relatively uniform pressing force to the sealing ring between the lower coarse filter plate 2 and the dust collecting chamber in the circumferential direction. Therefore, the existing air pre-filter connection structure has a large number of connectors, which increases the cost of parts and the workload of assembly.

[0009] 2. The claws 5 are fixed on the circumferential side wall of the dust collecting chamber. Compared with not clamping the lower coarse filter plate 2 and the dust collecting chamber by the claws 5, the radial dimension required for installing the air pre-filter is significantly increased. Engineering machinery and agricultural machinery vehicles that install air pre-filters need to reserve a larger radial installation space on the vehicle.

[0010] With the development of technology, more and more new components such as sensors and post-processing devices that reflect the direction of technological development need to be installed on vehicles, making the installation space on the vehicle increasingly cramped. For this reason, miniaturization and compact design have become a technical development trend for automotive components in recent years, so that more components can be installed in the same installation space.

[0011] Therefore, the structure in which the claw 5 connects the lower coarse filter disc 2 and the dust collecting chamber does not conform to the technical development trend of miniaturization and compactness, and increases the cost of parts and the workload of assembly. It is necessary to improve this.

[0012] 3. The claws 5 are fixed on the circumferential side wall of the dust collecting chamber, and the clamping force on the outer annular sealing ring 13 is significantly greater than the clamping force on the inner annular sealing ring 14, which may easily cause the inner annular sealing ring 14 to be insufficiently stressed and have a poor sealing effect. Utility Model Content

[0013] The utility model aims to provide an air pre-filter with a unified compression and sealing structure of upper and lower coarse filter discs and a dust collecting chamber, thereby reducing the cost of parts and the workload of assembly, and reducing the radial size of the installation space required for the air pre-filter.

[0014] To achieve the above-mentioned purpose, the air pre-filter with a unified compression and sealing structure of upper and lower coarse filter discs and a dust collecting chamber of the utility model comprises an upper coarse filter disc and a lower coarse filter disc arranged at intervals from top to bottom, the upper coarse filter disc is upwardly connected to an upper shell body, and the lower coarse filter disc is downwardly connected to a dust collecting chamber; the upper coarse filter disc and the upper shell body are upwardly connected to form an air outlet chamber; a central tube is connected to the center of the lower coarse filter disc, the upper end of the central tube is communicated with the air outlet chamber, the lower end of the central tube extends out of the lower coarse filter disc and the dust outlet chamber and is used to communicate with the air inlet of the air filter of the motor vehicle; a cylindrical air intake filter is connected between the outer peripheries of the upper coarse filter disc and the lower coarse filter disc;

[0015] A plurality of cyclone tube assemblies are connected between the upper coarse filter plate and the lower coarse filter plate, and the dust collecting chamber has an inner circumferential side wall adjacent to the central tube, an outer circumferential side wall corresponding to the upper and lower sides of the air inlet filter screen, and a bottom wall connected between the inner circumferential side wall and the bottom of the outer circumferential side wall;

[0016] An outer annular sealing ring is provided between the outer circumferential side wall of the dust collecting chamber and the lower coarse filter plate, and an inner annular sealing ring is provided between the inner circumferential side wall and the lower coarse filter plate.

[0017] A screw connection assembly is provided between the upper coarse filter plate, the lower coarse filter plate and the bottom wall of the dust collecting chamber. The screw connection assembly is located between the outer wall of the central tube and the outer circumferential surface of the lower coarse filter plate in the radial direction. Multiple screw connection assemblies are evenly arranged in the circumferential direction.

[0018] The screw connection assembly includes a screw, the upper end of which extends upwardly from the upper coarse filter plate and is screwed with an upper nut, and the radial protrusion of the screw below the upper coarse filter plate is provided with an upper boss that is tightly pressed with the upper coarse filter plate; the upper nut is used to clamp the upper coarse filter plate together with the upper boss after being tightened;

[0019] The middle part of the screw rod passes through the lower coarse filter plate, and the radial protrusion of the screw rod above the lower coarse filter plate is provided with a middle boss which is tightly pressed with the lower coarse filter plate, and the screw rod below the lower coarse filter plate is threaded with a middle nut which is used to clamp the lower coarse filter plate together with the middle boss after being tightened;

[0020] The bottom of the screw rod passes downward through the bottom wall of the dust collecting chamber, and the screw rod below the bottom wall of the dust collecting chamber is threaded with a lower nut. The lower nut is used to press the dust collecting chamber upward after being tightened, so that the dust collecting chamber presses the coarse filter plate upward through the outer annular sealing ring and the inner annular sealing ring.

[0021] The lower coarse filter disc at the outer annular sealing ring is provided with an outer sealing groove opening downward, and the outer annular sealing ring is arranged in the outer sealing groove; the lower coarse filter disc at the inner annular sealing ring is provided with an inner sealing groove opening downward, and the inner annular sealing ring is arranged in the inner sealing groove;

[0022] The outer circumferential side wall of the dust collecting chamber extends upward into the outer sealing groove and presses the bottom of the outer sealing groove through the outer annular sealing ring; the inner circumferential side wall of the dust collecting chamber extends upward into the inner sealing groove and presses the bottom of the inner sealing groove through the inner annular sealing ring.

[0023] The utility model has the following advantages:

[0024] The utility model eliminates the original claws on the circumferential side wall of the dust collecting chamber, which are used to clamp and fix the outer circumferential side wall of the dust collecting chamber and the lower coarse filter plate together. The utility model replaces the original pull rod assemblies and the claw assemblies between the dust collecting chamber and the lower coarse filter plate with a screw connection assembly, which significantly reduces the number of parts, reduces the cost of parts, and improves assembly efficiency.

[0025] In the present invention, there is no claw protruding radially from the lower coarse filter plate (the claw on the bottom wall of the dust collecting chamber is used to fix the dust outlet cover on the dust collecting chamber, and is not used to press the dust collecting chamber and the lower coarse filter plate together, and the fixed end of the claw is not installed on the outer circumferential side wall of the dust collecting chamber, but is installed on the bottom wall of the dust collecting chamber), thereby reducing the radial size of the installation space required by the present invention, which is in line with the technical development trend of miniaturization and compactness.

[0026] The screw connecting assembly in the utility model is located between the outer wall of the central tube and the outer circumferential surface of the lower coarse filter disc in the radial direction, and between the inner annular sealing ring and the outer annular sealing ring. Therefore, it can apply a more uniform tightening pressure to the outer annular sealing ring and the inner annular sealing ring than before, avoiding the problem that the inner annular sealing ring is prone to poor sealing effect due to insufficient force.

[0027] The screw connection assembly consists of a screw, an upper boss, a middle boss, an upper nut, a middle nut and a lower nut. It has a simple structure and is easy to manufacture and assemble. By tightening the nuts, the upper coarse filter plate, the lower coarse filter plate and the dust collecting chamber are tightly connected, and the outer annular sealing ring and the inner annular sealing ring are subjected to more uniform tightening pressure than before.

[0028] The outer sealing groove and the inner sealing groove cooperate with the outer annular sealing ring and the inner annular sealing ring, which not only facilitates accurate positioning during assembly, but also improves the reliability of sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an air pre-filter adopting the structure of the utility model;

[0030] Figure 2 yes Figure 1 CC section view;

[0031] Figure 3 yes Figure 1 BB cross-sectional view;

[0032] Figure 4 yes Figure 1 AA section view;

[0033] Figure 5 yes Figure 2The enlarged view of point A in the middle;

[0034] Figure 6 yes Figure 3 The enlarged view of point B in the middle;

[0035] Figure 7 yes Figure 3 Enlarged view of point C in the middle;

[0036] Figure 8 yes Figure 3 The enlarged view of point D in the middle;

[0037] Fig. 9 It is a structural schematic diagram of the improved front air pre-filter of the utility model. DETAILED DESCRIPTION

[0038] like Figures 1 to 8 As shown, and refer to Fig. 9 The utility model provides an air pre-filter with a unified compression and sealing structure of upper and lower coarse filter discs and a dust collecting chamber, comprising an upper coarse filter disc 1 and a lower coarse filter disc 2 arranged at intervals from top to bottom, the upper coarse filter disc 1 is connected to an upper shell body 3 upward, and the lower coarse filter disc 2 is connected to a dust collecting chamber downward; the upper coarse filter disc 1 and the upper shell body 3 form an air outlet chamber 6 upward; a central tube 10 is connected to the center of the lower coarse filter disc 2 (the central tube 10 is preferably an integrally formed structure with the lower coarse filter disc 2), the upper end of the central tube 10 is communicated with the air outlet chamber 6, and the lower end of the central tube 10 extends out of the lower coarse filter disc 2 and the dust outlet chamber and is used to communicate with the air inlet of the air filter of the motor vehicle; a cylindrical air intake filter screen 7 is connected between the outer peripheries of the upper coarse filter disc 1 and the lower coarse filter disc 2;

[0039] A plurality of cyclone tube assemblies 8 are connected between the upper coarse filter plate 1 and the lower coarse filter plate 2. An air inlet cavity 9 is formed between the air inlet filter screen 7, the upper coarse filter plate 1 and the lower coarse filter plate 2. The air inlet of each cyclone tube assembly 8 is located in the middle of the cyclone tube assembly 8 in the vertical direction and is communicated with the air inlet cavity 9. The air outlet of each cyclone tube assembly 8 is communicated with the air outlet cavity 6 upward, and the dust outlet of each cyclone tube assembly 8 is communicated with the dust collecting cavity downward.

[0040] The dust collecting chamber has an inner circumferential side wall 11 adjacent to the central tube 10, an outer circumferential side wall 12 corresponding to the upper and lower sides of the air inlet filter 7, and a bottom wall connected between the bottom of the inner circumferential side wall 11 and the bottom of the outer circumferential side wall 12;

[0041] An outer annular sealing ring 13 is provided between the outer circumferential side wall 12 of the dust collecting chamber and the lower coarse filter disc 2, and an inner annular sealing ring 14 is provided between the inner circumferential side wall 11 and the lower coarse filter disc 2; the outer annular sealing ring 13 is used to prevent the outer top of the dust collecting chamber from being sealed loosely, and the inner annular sealing ring 14 is used to prevent the inner top of the dust collecting chamber from being sealed loosely. Any loose sealing will lead to a decrease in the pre-filtration effect of the air pre-filter.

[0042] A screw connection assembly is provided between the upper coarse filter plate 1, the lower coarse filter plate 2 and the bottom wall of the dust collection chamber. The screw connection assembly is located between the outer wall of the central tube 10 and the outer circumferential surface of the lower coarse filter plate 2 in the radial direction. A plurality of screw connection assemblies are evenly provided in the circumferential direction (preferably four in this embodiment). The screw connection assembly provides a force for the inner circumferential side wall 11 and the outer circumferential side wall 12 to press the outer annular sealing ring 13 and the inner annular sealing ring 14 upward accordingly.

[0043] The utility model eliminates the original claws 5 provided on the circumferential side wall of the dust collecting chamber, where the claws 5 are used to clamp and fix the outer circumferential side wall 12 of the dust collecting chamber and the lower coarse filter plate 2 together. The utility model replaces the original pull rod assemblies and the claw assemblies between the dust collecting chamber and the lower coarse filter plate 2 with a screw connection assembly, which significantly reduces the number of parts, reduces the cost of parts, and improves assembly efficiency.

[0044] In the present invention, there is no claw 5 radially protruding from the lower coarse filter plate 2 (the claw on the bottom wall of the dust collecting chamber is used to fix the dust outlet cover on the dust collecting chamber, and is not used to press the dust collecting chamber and the lower coarse filter plate 2 together, and the fixed end of the claw is not installed on the outer circumferential side wall 12 of the dust collecting chamber, but is installed on the bottom wall of the dust collecting chamber), thereby reducing the radial size of the installation space required by the present invention, which is in line with the technical development trend of miniaturization and compactness.

[0045] The screw connection assembly in the utility model is located between the outer wall of the central tube 10 and the outer circumferential surface of the lower coarse filter plate 2 in the radial direction, and between the inner annular sealing ring 14 and the outer annular sealing ring 13, so that a more uniform tightening pressure can be applied to the outer annular sealing ring 13 and the inner annular sealing ring 14 than before, avoiding the problem that the inner annular sealing ring 14 is prone to poor sealing effect due to insufficient force.

[0046] The screw connection assembly includes a screw 15, the upper end of the screw 15 extends upwardly from the upper coarse filter disc 1 and is screwed with an upper nut 16, and the screw 15 below the upper coarse filter disc 1 is radially protruded with an upper boss 17 that is tightly pressed with the upper coarse filter disc 1; the upper nut 16 is used to clamp the upper coarse filter disc 1 together with the upper boss 17 after being tightened;

[0047] The middle part of the screw rod 15 passes through the lower coarse filter plate 2, and the screw rod 15 above the lower coarse filter plate 2 is radially protruded with a middle boss 18 that is tightly pressed with the lower coarse filter plate 2, and the screw rod 15 below the lower coarse filter plate 2 is screwed with a middle nut 19, which is used to clamp the lower coarse filter plate 2 together with the middle boss 18 after being tightened;

[0048] The bottom of the screw 15 passes downward through the bottom wall 20 of the dust collecting chamber, and the screw 15 below the bottom wall 20 of the dust collecting chamber is threaded with a lower nut 21. The lower nut 21 is used to press the dust collecting chamber upward after being tightened, so that the dust collecting chamber presses the coarse filter plate 2 upward through the outer annular sealing ring 13 and the inner annular sealing ring 14.

[0049] The screw 15 connecting assembly consists of a screw 15, an upper boss 17, a middle boss 18, an upper nut 16, a middle nut 19 and a lower nut 21. It has a simple structure and is convenient for manufacturing and assembly. By tightening the nuts, the upper coarse filter plate 1, the lower coarse filter plate 2 and the dust collecting chamber are tightly connected, and the outer annular sealing ring 13 and the inner annular sealing ring 14 are subjected to a more uniform tightening pressure than before.

[0050] The lower coarse filter disc 2 at the outer annular sealing ring 13 is provided with an outer sealing groove 22 opening downward, and the outer annular sealing ring 13 is arranged in the outer sealing groove 22; the lower coarse filter disc 2 at the inner annular sealing ring 14 is provided with an inner sealing groove 23 opening downward, and the inner annular sealing ring 14 is arranged in the inner sealing groove 23;

[0051] The outer circumferential side wall 12 of the dust collecting chamber extends upward into the outer sealing groove 22 and presses the bottom of the outer sealing groove 22 through the outer annular sealing ring 13; the inner circumferential side wall 11 of the dust collecting chamber extends upward into the inner sealing groove 23 and presses the bottom of the inner sealing groove 23 through the inner annular sealing ring 14.

[0052] The outer sealing groove 22 and the inner sealing groove 23 cooperate with the outer annular sealing ring 13 and the inner annular sealing ring 14, which not only facilitates accurate positioning during assembly, but also improves the reliability of sealing.

[0053] During assembly, firstly, the screw 15 is passed upward through the upper coarse filter plate 1 and the middle part of the screw 15 is passed downward through the lower coarse filter plate 2, and then the bottom ends of the screws 15 of the screw 15 connecting assemblies are passed through the corresponding through holes on the bottom wall 20 of the dust collecting chamber, and the dust collecting chamber is moved upward from bottom to top, so that the outer circumferential side wall 12 of the dust collecting chamber extends upward into the outer sealing groove 22 and presses the outer annular sealing ring 13, and at the same time, the inner circumferential side wall 11 of the dust collecting chamber extends upward into the inner sealing groove 23 and presses the inner annular sealing ring 14; tighten the nuts, first tighten the middle nut 19 and the upper nut 16, and finally tighten the lower nut 21, to complete the unified connection of the upper coarse filter plate 1, the lower coarse filter plate 2 and the dust collecting chamber.

[0054] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An air pre-filter with a unified compression and sealing structure of upper and lower coarse filter discs and a dust collecting chamber, comprising an upper coarse filter disc and a lower coarse filter disc arranged at intervals from top to bottom, the upper coarse filter disc is upwardly connected to an upper housing, and the lower coarse filter disc is downwardly connected to a dust collecting chamber; the upper coarse filter disc and the upper housing are upwardly connected to form an air outlet chamber; a central tube is connected to the center of the lower coarse filter disc, the upper end of the central tube is communicated with the air outlet chamber, the lower end of the central tube extends out of the lower coarse filter disc and the dust outlet chamber and is used to communicate with the air inlet of the motor vehicle air filter; a cylindrical air intake filter is connected between the outer peripheries of the upper coarse filter disc and the lower coarse filter disc; A plurality of cyclone tube assemblies are connected between the upper coarse filter plate and the lower coarse filter plate, and the dust collecting chamber has an inner circumferential side wall adjacent to the central tube, an outer circumferential side wall corresponding to the upper and lower sides of the air inlet filter screen, and a bottom wall connected between the inner circumferential side wall and the bottom of the outer circumferential side wall; An outer annular sealing ring is provided between the outer circumferential side wall of the dust collecting chamber and the lower coarse filter plate, and an inner annular sealing ring is provided between the inner circumferential side wall and the lower coarse filter plate. Features: A screw connection assembly is provided between the upper coarse filter plate, the lower coarse filter plate and the bottom wall of the dust collecting chamber. The screw connection assembly is located between the outer wall of the central tube and the outer circumferential surface of the lower coarse filter plate in the radial direction. Multiple screw connection assemblies are evenly arranged in the circumferential direction.

2. The air pre-filter with a unified compression and sealing structure of upper and lower coarse filter plates and a dust collecting chamber according to claim 1, characterized in that: The screw connection assembly includes a screw, the upper end of which extends upwardly from the upper coarse filter plate and is screwed with an upper nut, and the radial protrusion of the screw below the upper coarse filter plate is provided with an upper boss that is tightly pressed with the upper coarse filter plate; the upper nut is used to clamp the upper coarse filter plate together with the upper boss after being tightened; The middle part of the screw rod passes through the lower coarse filter plate, and the radial protrusion of the screw rod above the lower coarse filter plate is provided with a middle boss which is tightly pressed with the lower coarse filter plate, and the screw rod below the lower coarse filter plate is threaded with a middle nut which is used to clamp the lower coarse filter plate together with the middle boss after being tightened; The bottom of the screw rod passes downward through the bottom wall of the dust collecting chamber, and the screw rod below the bottom wall of the dust collecting chamber is threaded with a lower nut. The lower nut is used to press the dust collecting chamber upward after being tightened, so that the dust collecting chamber presses the coarse filter plate upward through the outer annular sealing ring and the inner annular sealing ring.

3. The air pre-filter with a unified compression and sealing structure of upper and lower coarse filter discs and a dust collecting chamber according to claim 1 or 2, characterized in that: The lower coarse filter disc at the outer annular sealing ring is provided with an outer sealing groove opening downward, and the outer annular sealing ring is arranged in the outer sealing groove; the lower coarse filter disc at the inner annular sealing ring is provided with an inner sealing groove opening downward, and the inner annular sealing ring is arranged in the inner sealing groove; The outer circumferential side wall of the dust collecting chamber extends upward into the outer sealing groove and presses the bottom of the outer sealing groove through the outer annular sealing ring; the inner circumferential side wall of the dust collecting chamber extends upward into the inner sealing groove and presses the bottom of the inner sealing groove through the inner annular sealing ring.

Images