Special-shaped air filter

Abstract

The utility model discloses a special-shaped air filter which comprises a shell, the shell is forwards connected with an air outlet end cover, the shell is backwards connected with a rear end cover, a filter element is arranged in the shell, an air inlet is formed in the shell, and an air outlet is formed in the air outlet end cover. The axial direction of the filter element extends in the front-back direction, a supporting cylinder used for supporting the front end of the filter element is arranged on the front end face of the shell, and the front end of the filter element is inserted into the supporting cylinder. A cavity between the filter element and the shell forms an air inlet cavity, the air inlet cavity is communicated with an air inlet, and the air inlet is in a big-end-down horn mouth shape. The filter element comprises an outer filter element and an inner filter element which are coaxially sleeved together; two groups of filter elements are arranged in the shell side by side up and down at intervals. The air inlet with the small outside and the large inside enables airflow to be better expanded to all the air inlet cavities, flow collection of all parts of the surface of the filter element is more uniform, and the situation that some parts of the filter element are blocked in advance and the overall service life of the filter element is shortened is avoided. The two groups of filter elements are arranged in parallel, so that the same air filtering capacity requirement is met, the diameters of the filter elements are reduced, and the device is more matched with an in-vehicle mounting space which is narrower in the left-right direction and higher in height.

Description

Technical Field

[0001] The utility model relates to an air filter for an intake system of construction machinery and commercial vehicles. Background Art

[0002] With the upgrading of engine emission requirements, the engine needs to be equipped with a post-treatment system, which will pose a great challenge to the overall layout of the engine. The installation of the post-treatment system occupies most of the space of the air filter. According to the traditional design method, the diameter of the cylindrical air filter is reduced within the existing boundary, and the dust holding capacity will be greatly reduced compared with the original, while the intake resistance will increase, and overall it will not meet the air filtration requirements of the existing operating conditions. The existing air filters on the market also have problems such as high intake resistance, low dust holding capacity, the air flow directly blowing towards the filter element, and the filter element being unsupported and prone to shaking.

[0003] The existing air filter for the intake system of construction machinery and commercial vehicles includes a housing, an air outlet end cover is connected to the front of the housing, a rear end cover is connected to the rear of the housing, a filter element is arranged inside the housing, an air inlet is arranged on the housing, and an air outlet is arranged on the air outlet end cover. The axial direction of the filter element extends in the front-rear direction. A support ring for supporting the front end of the filter element is arranged at the front end of the housing. The front end of the filter element is inserted into the support ring to be supported, and the rear end of the filter element is fixed by being pressed against the rear cover of the air filter by an axial pressing force.

[0004] The existing air filter for the intake system of construction machinery and commercial vehicles has the following problems:

[0005] 1. In order to improve the ability of the air flow to pass through the filter element, in the prior art, a trumpet-shaped intake structure with a large outer and small inner shape has been researched and designed. By concentrating the flow, the air flow speed is increased, and thus the ability of the air flow to pass through the filter element is improved. However, this will cause the air flow to directly blow towards a part of the filter element, easily resulting in very uneven air ventilation volume at each part of the filter element.

[0006] 2. The rear end of the filter element is fixed only by being pressed against the rear cover of the air filter by an axial (front-rear direction) pressing force. Since the vehicle may vibrate during driving, the vibration effect causes the rear end of the filter element to displace downward during long-term use. After the rear end of the filter element displaces downward, the original sealing state may be damaged, which is not conducive to the stable operation of the air filter.

[0007] 3. It is usually a cylindrical filter element and a cylindrical shell. When the aftertreatment system is not installed in the whole vehicle, there is sufficient installation space in the vehicle, and the diameters of the shell and the filter element are not restricted. After installing the aftertreatment system, the installation space in many vehicle models limits the diameters of the shell and the filter element. The decrease in the diameter of the filter element will cause its filtration capacity to fail to meet the filtration requirements. After installing the aftertreatment system, the installation space in the vehicle has a space that is narrower in the left-right direction than the diameter of the traditional shell and higher in the up-down direction than the diameter of the traditional shell. However, the width in the left-right direction limits the maximum diameter of the filter element, and it is difficult for the filter element with a reduced diameter to meet the original filtration requirements. There is no air filter in the prior art that can match this installation space. Summary of the Utility Model

[0008] The purpose of the present utility model is to provide a special-shaped air filter that matches the installation space in the vehicle with a narrower left-right direction and a higher height, and avoids the situation where the air ventilation volume of different parts of the filter element and different filter elements varies greatly.

[0009] To achieve the above purpose, the special-shaped air filter of the present utility model includes a shell. The shell is connected with an air outlet end cover forward and a rear end cover backward. A filter element is arranged inside the shell. An air inlet is arranged on the shell, and an air outlet is arranged on the air outlet end cover. The axial direction of the filter element extends along the front-rear direction. A support cylinder for supporting the front end of the filter element is arranged on the front end face of the shell, and the front end of the filter element is inserted into the support cylinder. The cavity between the filter element and the shell forms an air inlet cavity, and the air inlet cavity is communicated with the air inlet. The air inlet is in the shape of a flared mouth with a smaller upper part and a larger lower part.

[0010] The filter element includes an outer filter element and an inner filter element sleeved together coaxially. The front end of the inner filter element is inserted into the support cylinder. Two groups of filter elements are arranged in the shell at intervals side by side in the up-down direction, and two support cylinders are respectively arranged corresponding to the two groups of filter elements. Each support cylinder communicates with the inner cavity of the air outlet end cover forward.

[0011] An upper slot is formed between the top of the front end face of the filter element and the outer surface of the upper support cylinder, and the front end part of the upper outer filter element is inserted into the upper slot.

[0012] A lower slot is formed between the top of the front end face of the filter element and the outer surface of the lower support cylinder, and the front end part of the lower outer filter element is inserted into the lower slot.

[0013] Two support rings are respectively protruded forward corresponding to the two groups of filter elements on the rear end cover, and the rear ends of the two groups of filter elements are respectively inserted into the corresponding support rings.

[0014] The present utility model has the following advantages:

[0015] The air inlet is in the shape of a flared mouth with a smaller upper part and a larger lower part, having a structure that is smaller on the outside and larger on the inside, contrary to the air inlets of similar products in the past which are larger on the outside and smaller on the inside. An air inlet that is larger on the outside and smaller on the inside increases the air flow speed through confluence, thereby enhancing the ability of the air flow to pass through the filter element. However, this causes the air flow to directly blow onto a local part of the filter element, easily resulting in a very uneven air ventilation volume at various parts of the filter element. The present utility model adopts an air inlet that is smaller on the outside and larger on the inside. Although the speed of the air flow entering the filter element slows down, the air flow can better expand to the entire intake cavity, making the air reception more uniform across the surface of the filter element, avoiding a situation where there is a large difference in the air ventilation volume between different parts of the filter element and different filter elements. Furthermore, during long-term use, it prevents some parts of the filter element from being blocked prematurely while other parts of the filter element have too little dust capacity, thus reducing the overall service life of the filter element. Since the air flow passes through the surface of the filter element more evenly, compared with the prior art where the air flow passes through locally more concentratedly, the overall air flow resistance of the filter element is reduced (similar to the flow resistance being reduced due to the widening of the flow channel), and the ability of the air flow to pass through the filter element is also significantly improved compared with the prior art without a flared mouth.

[0016] Each filter element includes an outer filter element and an inner filter element. The outer filter element can serve as the main filter element, and the inner filter element can serve as a safety filter element, or the inner filter element can serve as the main filter element and the outer filter element can serve as a safety filter element. When the main filter element fails, the safety filter element ensures basic air filtration to prevent large particulate impurities from entering the engine.

[0017] The two groups of filter elements form a parallel structure between the air inlet and the air outlet. Under the condition of meeting the same air filtration volume requirement, the filter element diameter is significantly reduced compared with a single filter element, making the present utility model more suitable for the installation space in the vehicle that is narrower in the left-right direction and higher in height. The internal space of the housing outside the filter element is all used as the intake cavity, and the intake air can be better distributed throughout the space.

[0018] In the past, the filter element was only supported at the front end and fixed at the rear end by axial pressing force. In a long-term vibrating use environment, problems such as the sinking of the rear end of the filter element and the destruction of the seal would occur. In the present utility model, the front end of the filter element is limited and supported by a support cylinder, and the rear end of the filter element is limited and supported by a support ring. Therefore, in a long-term vibrating use environment (there is vibration during vehicle driving), the rear end of the filter element will not sink, and the seal will not be damaged due to the displacement of the filter element, ensuring the long-term stable operation of the present utility model. Description of the Drawings

[0019] Figure 1 It is a schematic cross-sectional structure diagram of the present utility model.

[0020] Figure 2 It is Figure 1 the B-B cross-sectional view of

[0021] Figure 3 It is Figure 1 the C-C cross-sectional view of

[0022] Figure 4 is Figure 1 an enlarged view of part A in

[0023] Figure 5 a three-dimensional structural schematic diagram of the present utility model. Specific embodiments

[0024] As Figures 1 to 5 shown, the special-shaped air filter of the present utility model includes a housing 1. The housing 1 is connected to an air outlet end cover 2 by screws at the front, and is connected to a rear end cover 3 by a buckle 4 at the rear. A filter element is provided inside the housing 1, and an air inlet 5 is provided on the housing 1, and an air outlet 6 is provided on the air outlet end cover 2; the axis of the filter element extends in the front-rear direction. A support cylinder 7 for supporting the front end of the filter element is provided on the front end face of the housing 1. (The axis of the support cylinder 7 indicated in the enlarged view is below the indicated part and is coaxial with the filter element), and the front end of the filter element is inserted into the support cylinder 7; the cavity between the filter element and the housing 1 forms an air inlet cavity 8, and the air inlet cavity 8 communicates with the air inlet 5. The air inlet 5 is in the shape of a flared mouth with a smaller upper part and a larger lower part.

[0025] In the present utility model, it is not a standard flared mouth shape, but a special-shaped flared mouth shape, because it is necessary to match the specific installation space in the vehicle.

[0026] The air inlet 5 is in the shape of a flared mouth with a smaller upper part and a larger lower part, which is a structure with a smaller outer part and a larger inner part, contrary to the air inlet 5 of the same type of products in the past with a larger outer part and a smaller inner part. The air inlet 5 with a larger outer part and a smaller inner part increases the air flow velocity through confluence, thereby improving the ability of the air flow to pass through the filter element. However, this will cause the air flow to directly blow to a part of the filter element, easily resulting in very uneven air ventilation in each part of the filter element. The present utility model adopts an air inlet 5 with a smaller outer part and a larger inner part. Although the speed of the air flow entering the filter element becomes slower, the air flow can better expand to the entire air inlet cavity 8, making the air flow on the surface of the filter element more uniform everywhere, avoiding the situation that the air ventilation in different parts of the filter element and different filter elements varies too much. Furthermore, in long-term use, it can avoid the situation that some parts of the filter element are blocked in advance while other parts of the filter element have too little dust capacity, resulting in a reduction in the overall life of the filter element. Since the air flow passes through the surface of the filter element more evenly everywhere, compared with the prior art in which the air flow passes through locally more concentratedly, the overall air flow resistance of the filter element is reduced (similar to the reduction of flow resistance caused by the widening of the flow channel), and the ability of the air flow to pass through the filter element is also significantly improved compared with the prior art without a flared mouth.

[0027] The filter element includes an outer filter element 9 and an inner filter element 10 sleeved together coaxially. The front end of the inner filter element 10 is inserted into the support cylinder 7; two groups of filter elements are arranged side by side and spaced apart up and down inside the housing 1, and two support cylinders 7 corresponding to the two groups of filter elements are provided respectively; each support cylinder 7 communicates forward with the inner cavity of the air outlet end cover 2 (this inner cavity communicates with the air outlet 6);

[0028] Between the top of the front end face of the filter element and the outer surface of the upper support cylinder 7, an upper slot 11 is formed, and the front end of the upper outer filter element 9 is inserted into the upper slot 11;

[0029] Between the top of the front end face of the filter element and the outer surface of the lower support cylinder 7, a lower slot is formed, and the front end of the lower outer filter element 9 is inserted into the lower slot; the lower slot is vertically symmetrical to the upper slot 11 in structure and is not shown in the enlarged view.

[0030] The upper slot 11 and the lower slot are vertically symmetrical with respect to the two groups of filter elements respectively.

[0031] Each filter element includes an outer filter element 9 and an inner filter element 10. The outer filter element 9 can be used as the main filter element, and the inner filter element 10 can be used as the safety filter element, or the inner filter element 10 is used as the main filter element and the outer filter element 9 is used as the safety filter element. When the main filter element fails, the safety filter element ensures basic filtration of the air to prevent large particulate impurities from entering the engine.

[0032] The two groups of filter elements form a parallel structure between the air inlet 5 and the air outlet 6. Under the condition of meeting the same air filtration volume requirement, the diameter of the filter element is significantly reduced compared with a single filter element, making the present utility model more suitable for the installation space in the vehicle that is narrower in the left-right direction and higher in the height direction. The internal space of the housing 1 outside the filter element is used as the air inlet cavity 8, and the air inlet is well distributed in all parts of the space.

[0033] The rear end cover 3 is provided with two support rings 12 protruding forward corresponding to the two groups of filter elements respectively, and the rear ends of the two groups of filter elements are respectively inserted into the corresponding support rings 12.

[0034] In the past, the filter element was only supported at the front end, and the rear end was fixed by axial pressing force. In the long-term vibration use environment, problems such as the sinking of the rear end of the filter element and the damage of the seal would occur. In the present utility model, the front end of the filter element is limited and supported by the support cylinder 7, and the rear end of the filter element is limited and supported by the support ring 12. Therefore, in the long-term vibration use environment (there is vibration during vehicle driving), the rear end of the filter element will not sink, and the seal will not be damaged due to the displacement of the filter element, ensuring the long-term stable operation of the present utility model.

[0035] During use, the present utility model is installed in the intake system of a construction machinery vehicle or a commercial vehicle to provide filtered air for the engine. Under the constraint of the same air filtration volume, the diameter of the filter element of the present utility model is reduced, and it is narrower in the left-right direction and higher in the up-down direction, which is more suitable for the internal installation space of the construction machinery and commercial vehicle after adding the post-treatment system, and can be adapted to the installation space in the vehicle of multiple existing models.

[0036] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the present invention, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. The special-shaped air filter includes a housing. The housing is connected to an air outlet end cover forward and a rear end cover backward. A filter element is arranged inside the housing. An air inlet is provided on the housing, and an air outlet is provided on the air outlet end cover. The axial direction of the filter element extends along the front-rear direction, and it is characterized in that: A support cylinder for supporting the front end of the filter element is provided on the front end face of the housing, and the front end of the filter element is inserted into the support cylinder; the cavity between the filter element and the housing forms an air inlet cavity, which is communicated with the air inlet, and the air inlet is in the shape of a flared mouth with a smaller upper part and a larger lower part.

2. The special-shaped air filter according to claim 1, wherein: The filter element includes an outer filter element and an inner filter element sleeved coaxially together, and the front end of the inner filter element is inserted into the support cylinder; two groups of filter elements are arranged side by side and spaced apart up and down in the housing, and two support cylinders are provided corresponding to the two groups of filter elements one by one; each support cylinder communicates forward with the inner cavity of the air outlet end cover; An upper slot is formed between the top of the front end face of the filter element and the outer surface of the support cylinder located above, and the front end of the outer filter element located above is inserted into the upper slot; A lower slot is formed between the top of the front end face of the filter element and the outer surface of the support cylinder located below, and the front end of the outer filter element located below is inserted into the lower slot.

3. The special-shaped air filter according to claim 2, wherein: Two support rings are protruded forward corresponding to the two groups of filter elements on the rear end cover, and the rear ends of the two groups of filter elements are respectively inserted into the corresponding support rings.

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