Filter housing for a filter system and filter system with a filter housing

Abstract

Filter housing (114) for a filter system (100) for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, with a receiving space (112) for at least one filter element (40), with an inlet opening (102) for a fluid to be filtered and an outlet opening (106) for the filtered fluid, which are arranged in a housing wall (116), wherein the at least one filter element (40), when mounted as intended, is provided to separate a raw side (50) from a clean side (52) between the inlet opening (102) and the outlet opening (106), wherein on a housing segment (120) having the inlet opening (102), a flow protection device (124) is arranged, which is spaced radially from the housing segment (120) and directed towards the receiving space (112), and extends essentially only over the inlet opening (102), and wherein in a An outlet nozzle (140) is arranged in the housing segment (122),which is covered towards the receiving space (112) by a further flow protection (128).

Description

Technical area

[0001] The invention relates to a filter housing for a filter system for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, and a filter system for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, with a filter housing. State of the art

[0002] DE 10 2019 132 361 A1 discloses a filter device used for gas filtration, for example, for air filtration. The filter device has a filter housing and a filter element accommodated in the filter housing, which at least partially encloses a flow space. The filter element comprises a filter body through which the fluid to be cleaned flows radially from the outside to the inside, so that the internal flow space at least partially enclosed by the filter body forms the clean space for receiving the cleaned fluid. The cleaned fluid, which is accommodated in the internal flow space, is discharged from the filter device via a flow nozzle. At least one opening is introduced into the wall of the flow nozzle, adjacent to which a fastening flange is arranged on the flow nozzle.The mounting flange is used for the detachable attachment of a purge gas pipe of a purge device, which can be used to clean the filter body of deposits. A pressurized purge medium is introduced into the internal flow chamber via the purge gas pipe of the purge device, whereupon the deposits on the outside of the filter body are loosened by the pressure pulse of the purge medium.

[0003] Further related filter devices are disclosed in DE 10 2014 224 764 A1, EP 2 708 273 A1 and US 2 068 048 A. Disclosure of the invention

[0004] An object of the invention is to provide a filter housing for a filter system for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, with which an efficient re-cleaning of the filter element is possible.

[0005] Another task is to provide a filter system with such a filter housing.

[0006] The above object is achieved according to one aspect of the invention by a filter housing for a filter system for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, with a receiving space for at least one filter element, with an inlet opening for a fluid to be filtered and an outlet opening for the filtered fluid, which are arranged in a housing wall, wherein the at least one filter element, when installed as intended, is provided to separate a raw side from a clean side between the inlet opening and the outlet opening, wherein on a housing segment which has the inlet opening, a flow guard is arranged which is spaced radially from the housing segment and directed towards the receiving space and extends essentially only over the inlet opening.

[0007] The further object is achieved by a filter system for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, with a filter housing according to one of the preceding claims, with an inlet opening for a fluid to be filtered and an outlet opening for the filtered fluid, which are arranged in a housing wall, and a receiving space for receiving a filter element, wherein a flushing device is provided which is designed to temporarily emit a pressure surge of a flushing medium from a clean side to a dirty side of the filter element arranged in the receiving space, wherein a secondary filter element is arranged on the clean side of the filter element, wherein on a housing segment which has the inlet opening, there is an onflow guard which is spaced radially from the housing segment and directed towards the receiving space and extends essentially only over the inlet opening.

[0008] Advantageous embodiments and advantages of the invention emerge from the further claims, the description and the drawing.

[0009] According to one aspect of the invention, a filter housing for a filter system for filtering a gaseous fluid is proposed, in particular for a self-cleaning engine intake air filter system, with a receiving space for at least one filter element, with an inlet opening for a fluid to be filtered and an outlet opening for the filtered fluid, which are arranged in a housing wall, wherein the at least one filter element, when installed as intended, is provided to separate a raw side from a clean side between the inlet opening and the outlet opening, wherein on a housing segment which has the inlet opening, there is arranged an onflow guard which is spaced radially from the housing segment and directed towards the receiving space and extends essentially only over the inlet opening.

[0010] Advantageously, the flow guard only covers a small portion of the filter element when the filter element is in place. However, the cover is sufficiently large to create a cyclonic movement around the filter element when the fluid to be cleaned flows in tangentially. The rotating movement of the fluid to be cleaned around the filter element already allows some of the particles, such as dust, pollen, and the like, to be removed from the fluid to be cleaned. If the filter element is to be freed of particles deposited on its exterior, a large area on the filter element's raw side can be cleaned due to the small amount of coverage of the flow guard. This can advantageously be achieved by means of a pressure surge directed against the flow direction of the fluid to be cleaned during normal operation.Optionally, the flow protection can be arranged on a surrounding frame of the housing, especially the upper housing section, or be formed integrally with this frame. The frame has only a small axial extension and has virtually no effect on the movement of the fluid to be cleaned around the filter element.

[0011] According to a favorable design of the filter housing, the flow protection can have a length that is at most 1.5 times the axial extent of the inlet opening in the housing wall along a longitudinal axis of the filter housing. Preferably, the length can be at most 1.3 times, particularly preferably at most 1.2 times, the axial extent of the inlet opening in the housing wall along a longitudinal axis of the filter housing. During back-cleaning of the filter element to remove deposited particles, a large outer surface of the filter element can be cleaned.

[0012] According to a favorable design of the filter housing, the flow protection can extend over a maximum of 160° of the circumference of the housing segment. The flow protection has an angularly limited extent around the longitudinal axis of the filter housing. Preferably, the flow protection can extend over a maximum of 120° of the circumference, particularly preferably over a maximum of 100°, and most particularly preferably over a maximum of 90°. This allows for sufficient protection against direct flow onto the filter element from the inlet opening in the filter housing.

[0013] An outlet nozzle is located in a housing segment of the filter housing, which is covered by an additional airflow shield towards the receiving space. The outlet nozzle is located on the raw side of the filter element. Separated particles can be extracted from the filter housing, for example, through the outlet nozzle. The particles can collect between the airflow shield and the housing wall. For example, the outlet nozzle can be located in a section of the filter housing remote from the inlet opening.

[0014] Advantageously, the axial length of the additional flow protection element can be at most three times, preferably at most twice, the axial extension of the outlet nozzle in the housing wall along a longitudinal axis L of the filter housing. Thus, deposited particles can be removed from a large exposed area on the raw side of the filter element.

[0015] In particular, the additional airflow protection can be designed to be circumferential relative to an inner side of the housing wall. This allows for simple manufacture of the additional airflow protection.

[0016] Conventional airflow protection devices cover a significantly larger portion of the filter element, both in the inlet and outlet areas, making back-cleaning the dirty side of the filter element inefficient. This can be avoided with this advantageous arrangement.

[0017] According to a favorable design of the filter housing, at least one receptacle for at least one flushing device can be arranged in an outlet connection located at the outlet opening. This allows for efficient back-cleaning of the filter element, which can be freed of deposited particles using pressure pulses.

[0018] According to a further aspect of the invention, a filter system for filtering a gaseous fluid is proposed, in particular for a self-cleaning engine intake air filter system, comprising a filter housing according to the invention, with an inlet opening for a fluid to be filtered and an outlet opening for the filtered fluid, which are arranged in a housing wall, and a receiving space for receiving a filter element, wherein a flushing device is provided which is designed to temporarily emit a pressure surge of a flushing medium from a clean side to a dirty side of the filter element arranged in the receiving space, wherein a secondary filter element is arranged on the clean side of the filter element, wherein on a housing segment which has the inlet opening, there is arranged an onflow guard which is spaced radially from the housing segment and directed towards the receiving space and extends essentially only over the inlet opening.

[0019] The relatively small coverage of the filter element on its outside allows a large area of ​​the filter element to be cleaned of deposited particles by activating the flushing device.

[0020] To clean the filter body of the filter element in the self-cleaning filter system of deposits on the raw side, the filter system is equipped with a flushing device. A flushing medium, such as a flushing gas, is introduced into the internal flow chamber on the clean side via an outlet opening of the filter system. This flushing medium flows through the wall of the filter body from the clean side to the raw side and loosens deposits on the raw side using a pressure pulse. The flushing device comprises a pipe bend that extends through an opening in the wall of the outlet connection adjacent to the outlet opening and is connected to the outlet connection.

[0021] The filter element is conveniently coupled to a secondary filter element on its clean side. The pressure pulse of the purge gas first passes through the secondary filter element, whose filter medium is, for example, a nonwoven layer, before it hits the filter body of the filter element. The filter medium of the secondary filter element can be covered with a support element to stabilize the nonwoven layer. This can prevent bulging and thus possible cracking of the filter medium.

[0022] The support element can advantageously be a radially outer protective net or grid, for example, made of plastic. This stabilizes the filter medium without causing an excessive pressure increase.

[0023] The filter element can be designed as a round element or, alternatively, as a flat element. The cross-section of the round element can be circular, oval, or square.

[0024] According to a favorable embodiment of the filter system, the inflow protection can have a length that is at most 1.5 times the axial extent of the inlet opening in the housing wall along a longitudinal axis of the filter housing. Preferably, the length can be at most 1.3 times, particularly preferably at most 1.2 times, the axial extent of the inlet opening in the housing wall along a longitudinal axis of the filter housing. During back-cleaning of the filter element to remove deposited particles, a large outer surface of the filter element can be cleaned.

[0025] Alternatively or additionally, the flow protection can extend over a maximum of 160° of the circumference of the housing segment. The flow protection has an angularly limited extent around the longitudinal axis of the filter housing. Preferably, the flow protection can extend over a maximum of 120° of the circumference, particularly preferably over a maximum of 100°, and most particularly preferably over a maximum of 90°. This allows for sufficient protection against direct flow onto the filter element from the inlet opening in the filter housing.

[0026] According to a favorable embodiment of the filter system, an outlet nozzle can be arranged in a housing segment, which outlet nozzle is covered by a further flow protection towards the receiving space, in particular wherein an axial length of the further flow protection corresponds at most to three times, preferably at most to twice, an axial extension of the outlet nozzle in the housing wall along a longitudinal axis of the filter housing.

[0027] This leaves a large area exposed on the raw side of the filter element, so that when the flushing device is activated, the raw side can be efficiently freed of deposited particles. Short description of the drawings

[0028] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0029] Examples include: Fig. 1 a side view of a filter housing of a filter system for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, according to an embodiment of the invention; Fig. 2 a perspective view of the filter housing of the filter system according to Fig. 1 with partially cut-open housing wall; Fig. 3 a longitudinal section through the filter housing according to Fig. 1 with a view of an inserted filter element; Fig. 4 a perspective view of a housing segment of the filter housing according to Fig. 1 with inlet nozzle and flow protection; and Fig. 5 another longitudinal section through the filter housing according to Fig. 1. Embodiments of the invention

[0030] In the figures, identical or similar components are numbered with the same reference numerals. The figures show only examples and are not to be understood as limiting.

[0031] The directional terminology used below, including terms such as "left," "right," "top," "bottom," "before," "behind," "after," and the like, is intended solely to enhance understanding of the figures and is in no way intended to limit the scope of the invention. The components and elements depicted, as well as their design and use, may vary according to the considerations of a person skilled in the art and may be adapted to specific applications.

[0032] Fig. 1 shows a side view of a filter housing 114 of a filter system 100 for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, according to an embodiment of the invention. Fig. 2 shows a perspective view of the filter housing 114 of the filter system 100 according to Fig. 1 with partially cut-open housing wall 116. Fig. 3 shows a longitudinal section through the filter housing 114 along the line III-III in Fig. 1 with a view of a filter element 40 with secondary filter element 10 in a receiving space 112 of the filter housing 114.

[0033] The filter system 100 serves, for example, to filter a gaseous fluid and is in particular a self-cleaning engine intake air filter system.

[0034] The filter housing 114 comprises an upper housing part 118 and a lower housing part 122 connected thereto. A housing wall 116 of the filter housing 114 has an inlet opening 102 and a central outlet opening 106 on the side, to which an inlet connection 104 and an outlet connection 108 are connected, respectively. These are arranged on a housing segment 120 of the upper housing part 118. Furthermore, the filter housing 114 has an outlet connection 140 on the lower housing part 122, through which particles separated from the fluid to be cleaned can be removed from the filter housing 114.

[0035] The upper housing section 118 has a housing segment 120, in which the inlet opening 102 is arranged in the housing wall 116 with the adjoining inlet connection 104. The fluid to be cleaned flows tangentially into the filter housing 114 and thereby rotates around the filter element 40, which is located in a receiving space 112 of the filter housing 114 and is designed here as a round element. Its outer side 42 is in contact with the unfiltered side 50, and its inner side is in contact with the clean side 52. A secondary filter element 10 is arranged as a safety element within the filter element 40, which is designed as a round element.

[0036] The filter element 40 has a closed end plate 48 on the side facing the housing base 122. The secondary filter element 10 has a closed end plate 28 there. On the opposite side of the filter element 40, it has an open end plate 49 through which the filtered fluid flows through the outlet opening into the outlet connection 108. There, the secondary filter element 10 has an open end 26. The secondary element 10 can have a support element 16 on its side facing the filter element 40. The filter element 40 can have a central tube 14 on its inside.

[0037] As in Fig. 2 with the housing wall 116 partially cut open in the housing section 120 with the inlet nozzle 104 partially cut away, the filter element 40 is covered in this area by an apron-like inflow guard 124 spaced apart from the housing wall 116. The inflow guard 124 extends essentially only over the inlet opening 102 in the housing wall 116, while other areas of the filter element 40 are not covered. The inflow guard 124 is arranged on a circumferential frame 125 of the housing 114, in particular formed integrally therewith.

[0038] As in the Fig. 2 and Fig. 3, a length 126 of the flow protection 124 in the axial direction of the longitudinal axis L is only slightly more than an axial extension of the inlet opening 102 in the direction of the longitudinal axis L.

[0039] As shown in the longitudinal section in Fig. 3, a flushing device 150, of which several may be present, is arranged on the outlet nozzle 108 and engages with a flushing pipe 152 into the outlet nozzle 108. A diffuser 154 is arranged at the open end of the flushing pipe 154 in a region 30 of the filter system 100 and is directed into the interior of the filter element 40. During a cleaning procedure, the flushing device 150 releases short pressure pulses with a flushing medium into the interior of the filter element 40, so that particles deposited on its outer side 42 are removed and can be removed via the outlet nozzle 140.

[0040] Because the filter element 40 is only covered in a relatively small area, a large area of ​​the filter element 40 can be cleaned during flushing with pressure pulses. Since the distance of a conventional flow shield to the outer side 42 of the filter element 40 is relatively small, particles would be removed from the outer side 42 in the covered area, but would largely remain in the gap 132 between the flow shield and the filter element 40. This would reduce the efficiency of the filter element 40.

[0041] At the closed end of the filter element 40, a further flow protection device 128 is arranged on the housing base 122. This device is circumferential and has a relatively short axial length 130, which allows for particularly effective back-cleaning of the filter element 40.

[0042] Fig. 4 shows a perspective view of the housing segment 120 of the filter housing 114 according to Fig. 1 with inlet nozzle 104 and flow protection 124.

[0043] On the housing segment 120, which has the inlet opening 102, the flow protection 124 is arranged, which is spaced radially from the housing segment 120 and directed towards the receiving space 112 and extends essentially only over the inlet opening 102.

[0044] The inflow protection 124 has a length 126 that is at most 1.5 times the axial extent of the inlet opening 102 in the housing wall 116 along a longitudinal axis L of the filter housing 114. The inflow protection 124 extends over a maximum of 160° of the circumference of the housing segment 120.

[0045] Fig. 5 shows a further longitudinal section through the filter housing 114 according to Fig. 1, in which an outlet nozzle 140 can be seen on the lower housing part 122. Through this, particles can be removed from the filter housing 114.

[0046] The outlet nozzle 140 is covered by a further flow protection 128 towards the receiving space 112. The further flow protection 128 has an axial length that corresponds to at most three times, preferably at most twice, the axial extension of the outlet nozzle 140 in the housing wall 116 along the longitudinal axis L of the filter housing 114.

[0047] Thus, during a cleaning procedure, a large area of ​​the outer side 42 of the filter element 40 can be freed of deposited particles. Reference symbol 10 Secondary filter element 14 Center pipe 16 Support element 26 open ending 28 End plate 30 area 32 length 40 filter element 42 Upstream side 46 filter bodies 48 end plate 49 End plate 50 raw pages 52 Clean side 100 filter system 102 Inlet opening 104 inlet nozzles 106 Outlet opening 108 outlet nozzles 110 diameter inlet 112 Recording Room 114 filter housings 116 Housing wall 118 Upper housing part 120 housing segment 122 Housing base 124 Flow protection 126 Length of flow protection 128 Flow protection 130 length of flow protection 140 outlet nozzles 142 diameter outlet nozzle 150 Flushing device 152 flush pipe 154 Diffuser L Longitudinal axis

Claims

[1] Filter housing (114) for a filter system (100) for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, with a receiving space (112) for at least one filter element (40), with an inlet opening (102) for a fluid to be filtered and an outlet opening (106) for the filtered fluid, which are arranged in a housing wall (116), wherein the at least one filter element (40), when installed as intended, is provided to separate a raw side (50) from a clean side (52) between the inlet opening (102) and the outlet opening (106), wherein on a housing segment (120) having the inlet opening (102), a flow protection device (124) is arranged, which is spaced radially from the housing segment (120) and directed towards the receiving space (112), and extends essentially only over the inlet opening (102), and wherein an outlet nozzle (140) is arranged in a housing segment (122),which is covered towards the receiving space (112) by a further flow protection (128). [2] Filter housing according to claim 1, wherein the flow protection (124) has a length (126) which is at most 1.5 times the axial extent of the inlet opening (102) in the housing wall (116) along a longitudinal axis (L) of the filter housing (114). [3] Filter housing according to claim 1 or 2, wherein the flow protection (124) extends over at most 160° of a circumference of the housing segment (120). [4] Filter housing according to claim 1, wherein an axial length of the further flow protection (128) corresponds to at most three times, preferably at most twice, an axial extension of the outlet nozzle (140) in the housing wall (116) along a longitudinal axis (L) of the filter housing (114). [5] Filter housing according to claim 1 or 4, wherein the further flow protection (128) is formed circumferentially relative to an inner side of the housing wall (116). [6] Filter housing according to one of the preceding claims, wherein at least one receptacle for at least one flushing device (150) is arranged in an outlet nozzle (108) arranged at the outlet opening (106). [7] Filter system (100) for filtering a gaseous fluid, in particular for a self-cleaning engine intake air filter system, with a filter housing (114) according to one of the preceding claims, with an inlet opening (102) for a fluid to be filtered and an outlet opening (106) for the filtered fluid, which are arranged in a housing wall (116), and a receiving space (112) for receiving a filter element (40), wherein a flushing device (150) is provided, which is designed to temporarily emit a pressure surge of a flushing medium from a clean side (52) to a dirty side (50) of the filter element (40) arranged in the receiving space (112), wherein a secondary filter element (10) is arranged on the clean side (52) of the filter element (40), wherein on a housing segment (120) which has the inlet opening (102), a a spaced-apart flow protection device (124) directed towards the receiving space (112) is arranged,which extends essentially only over the inlet opening (102). [8] Filter system according to claim 7, wherein the inflow protection (124) has a length (126) which is at most 1.5 times the axial extent of the inlet opening (102) in the housing wall (116) along a longitudinal axis (L) of the filter housing (114) and / or wherein the inflow protection (124) extends over at most 160° of a circumference of the housing segment (120). [9] Filter system according to claim 7 or 8, wherein an outlet nozzle (140) is arranged in a housing segment (122), which outlet nozzle is covered by a further inflow protection (128) towards the receiving space (112), in particular wherein an axial length of the further inflow protection (128) corresponds at most to three times, preferably at most to twice, an axial extension of the outlet nozzle (140) in the housing wall (116) along a longitudinal axis (L) of the filter housing (114).

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