CN104707481B - Filter assembly - Google Patents

Abstract

A filter assembly comprising a first filter and a second filter, wherein the first filter comprises a first housing, a first filter cartridge, and a first head provided with a first inlet passage and a first outlet passage. The second filter comprises a second housing, a second filter element and a second head, the second head being provided with a second inlet channel and a second outlet channel. The first inlet passage communicates with the second inlet passage, and the first outlet passage communicates with the second outlet passage. The first filter and the second filter are separately provided and detachably assembled together by a fixing member that detachably assembles the first head portion and the second head portion together. By the arrangement, systematic design can be realized, and proper number of filters can be selected for combination according to different application requirements.

Description

filter assembly

technical field

The invention relates to a filter assembly, in particular to a filter assembly used in an engine exhaust aftertreatment system and used to filter urea solution.

Background technique

The current engine exhaust after-treatment system generally includes a urea tank, a urea pump for pumping the urea solution out of the urea tank, and a filter for filtering the urea solution.

When the filter is used in a large engine aftertreatment system, in order to meet a certain filtering capacity, it is necessary to design a filter with a larger size. In addition, it is often necessary to design matching filters for different engine aftertreatment systems. This solution requires designing different filters for different engine aftertreatment systems, which greatly increases the cost.

Therefore, it is necessary to design a new type of filter assembly based on combining several filters to solve the above problems.

Contents of the invention

The purpose of the present invention is to provide a filter assembly with strong expandability.

In order to achieve the above object, the present invention adopts the following technical solution: a filter assembly, which at least includes a first filter and a second filter, wherein the first filter includes a first housing, located in the first housing The first filter element in the body and the first head matched with the first housing, the first head is provided with a first inlet passage and a first outlet passage; the second filter includes a second housing , a second filter element located in the second housing and a second head matched with the second housing, the second head is provided with a second inlet channel and a second outlet channel; the first The inlet channel communicates with the second inlet channel, the first outlet channel communicates with the second outlet channel, the first filter is set separately from the second filter and is detachably assembled on the Together, the fixing member detachably assembles the first head and the second head.

As a further improved technical solution of the present invention, the first filter and the second filter are connected in parallel in flow mode.

As a further improved technical solution of the present invention, the first filter includes a first inlet space located between the first filter element and the first housing and communicated with the first inlet channel, and The first outlet space in the first filter element and communicated with the first outlet channel; the second filter includes a space between the second filter element and the second housing and connected to the first outlet A second inlet space communicated with the two inlet channels, and a second outlet space located in the second filter element and communicated with the second outlet channel.

As a further improved technical solution of the present invention, the first filter includes a first distribution plate, and the first distribution plate is provided with a plurality of first leakage holes distributed along the circumferential direction, and the first leakage holes divide the first leakage holes into the An inlet channel communicates with the first inlet space; the second filter includes a second distribution plate, and the second distribution plate is provided with a plurality of second leakage holes distributed along the circumferential direction, and the second leakage holes The second inlet passage is communicated with the second inlet space.

As a further improved technical solution of the present invention, the first inlet channel is parallel to the first outlet channel, the second inlet channel is parallel to the second outlet channel, and the first inlet channel is parallel to the first outlet channel. The second inlet channels are aligned with each other, and the first outlet channel and the second outlet channels are aligned with each other.

As a further improved technical solution of the present invention, the filter assembly further includes a first sealing ring installed between the first inlet passage and the second inlet passage, and a sealing ring installed between the first outlet passage and the second inlet passage. The second sealing ring between the second outlet channel.

As a further improved technical solution of the present invention, the first inlet passage runs through the first head, and a first opening and a second opening are respectively formed on both sides of the first head; the first outlet passage also Through the first head, a third opening and a fourth opening are respectively formed on both sides of the first head; wherein the first opening and the third opening are located on the same side of the first head , the second opening and the fourth opening are located on the same side of the first head; the second inlet passage runs through the second head, forming a first five openings and a sixth opening; the second outlet channel also runs through the second head, forming a seventh opening and an eighth opening on both sides of the second head; wherein the fifth opening and the The seventh opening is located on the same side of the second head, the sixth opening and the eighth opening are located on the same side of the second head; the second opening is in contact with the fifth opening, The fourth opening is in contact with the seventh opening, the first sealing ring is located in the second opening, and the second sealing ring is located in the fourth opening.

As a further improved technical solution of the present invention, the filter assembly further includes an inlet joint inserted into the first opening and an outlet joint inserted into the third opening.

As a further improved technical solution of the present invention, the first casing is provided with a first cylindrical portion and a first connecting block welded on the top of the first cylindrical portion, and the thickness of the first connecting block is greater than that of the first connecting block. The wall thickness of a cylindrical part, the first head and the first connecting block are provided with external threads and internal threads that cooperate with each other, so that the first filter element can be detachably installed in the first housing .

As a further improved technical solution of the present invention, the fixing member includes a bolt and a nut that cooperates with the bolt.

As a further improved technical solution of the present invention, the first head is provided with a first mounting portion at its bottom, and the first mounting portion is provided with a first mounting groove penetrating transversely, and the first mounting groove is parallel to The first inlet channel; the second head is provided with a second installation part at its bottom, and the second installation part is provided with a slot penetrating downward; the bolt is accommodated in the first installation groove Inside, the nut is accommodated in the slot.

As a further improved technical solution of the present invention, the second installation part is provided with a second installation groove penetrating transversely, the second installation groove is parallel to the second inlet channel, and the groove and the second installation The grooves communicate with each other, and the second installation groove is used for receiving bolts matched with the third filter.

Compared with the prior art, the first filter and the second filter of the filter assembly of the present invention are set separately and are detachably assembled together through fixing parts, which can realize a systematic design, and select an appropriate number according to different application requirements Filters are combined, and the expansion ability is strong.

Description of drawings

Fig. 1 is a schematic diagram of the engine exhaust after-treatment system of the present invention.

FIG. 2 is a perspective view of the filter assembly of FIG. 1 .

FIG. 3 is a perspective view from another angle of FIG. 2 .

Fig. 4 is a front view of Fig. 2 .

FIG. 5 is a bottom view of FIG. 2 .

Fig. 6 is a left side view of Fig. 2 .

Fig. 7 is a partially exploded perspective view of Fig. 2, wherein the first filter is separated from the second filter, and the second filter is assembled with the third filter.

FIG. 8 is an exploded perspective view of FIG. 7 from another angle.

Fig. 9 is an exploded perspective view of Fig. 8 from another angle, wherein the filter housing is not shown.

Fig. 10 is a partially exploded perspective view of the first filter in Fig. 7 .

Fig. 11 is a sectional view of the first filter.

Figure 12 is a cross-sectional view of a filter assembly of the present invention in one position.

Figure 13 is a cross-sectional view of the filter assembly of the present invention in another position.

detailed description

Please refer to Fig. 1, the present invention discloses an exhaust aftertreatment system 100 that can be applied to large engines, which includes a urea tank 1, a filter assembly 3 connected to the urea tank 1, and used to transport the urea A fluid delivery device 4 for the solution, a common rail 5 connected to the fluid delivery device 4 , several nozzles 6 connected to the common rail 5 , and a controller 2 for controlling the exhaust gas post-treatment system 100 .

In the illustrated embodiment of the present invention, the engine 200 is a high-power engine whose power generally exceeds 500 kilowatts. The fluid delivery device 4 is provided with a pump 41 (such as a gear pump, etc.) for pumping the urea solution. In the illustrated embodiment of the present invention, the controller 2 is installed on the fluid delivery device 4 to realize integration. The nozzle 6 is used to spray atomized urea solution into the engine exhaust pipe 201 . The atomized urea solution is decomposed into ammonia gas in the engine exhaust pipe 201 , and the ammonia gas can react with nitrogen oxides in the exhaust gas, thereby reducing the emission of nitrogen oxides. Since the principle of this tail gas treatment technology is well known to those skilled in the art, the present invention will not repeat it here.

Please refer to FIGS. 2 to 13 , in the illustrated embodiment of the present invention, the filter assembly 3 includes a first filter 31 , a second filter 32 and a third filter 33 connected side by side. . The structures of the first, second and third filters 31, 32 and 33 are very similar, so as to facilitate the sharing of equipment/moulds and save manufacturing costs. The following only takes the first filter 31 as an example for detailed description.

Please refer to FIG. 7 to FIG. 13 , the first filter 31 includes a first housing 311 , a first filter element 312 installed in the first housing 311 and a The first head 313 of.

The first housing 311 includes a first cylindrical portion 3111 , a first bottom 3112 located at the bottom of the first cylindrical portion 3111 , a spring disposed on the first bottom 3112 and used to support the first filter element 312 upwards 3113, and the first connection block 3114 located at the top of the first cylindrical part 3111. In the illustrated embodiment of the present invention, the first connecting block 3114 is welded to the top end of the first cylindrical portion 3111 . The first connecting block 3114 is provided with internal threads.

Correspondingly, the lower end of the first head 313 is provided with an external thread matched with the internal thread. Since the first cylindrical portion 3111 is relatively thin, the thread structure cannot be provided in its thickness. The present invention cleverly solves this problem by providing the first connecting block 3114 and saves costs. Please refer to FIG. 11 , the thickness of the first connecting block 3114 is greater than the thickness of the first cylindrical portion 3111 . In addition, in the illustrated embodiment of the present invention, the first bottom portion 3112 and the first cylinder portion 3111 are separately provided and then welded together, and the cost is relatively low. In one embodiment of the present invention, the first housing 311 is made of stainless steel in order to be resistant to alkaline solution.

In the illustrated embodiment of the present invention, the first filter 31 is an outside-in-in-out filter. The first filter element 312 is roughly in the shape of a hollow cylinder. A first inlet space 3141 is formed between the first housing 311 and the first filter element 312 , and the hollow part of the first filter element 312 forms a first outlet space 3142 .

In addition, please refer to Figure 10, the first filter 31 also includes a first distribution plate 315 located at the upper end of the first inlet space 3141, the first distribution plate 315 is provided with several A leakage hole 3151 , the first leakage hole 3151 communicates with the first inlet space 3141 .

Please refer to FIG. 10 and FIG. 11 , the first filter 31 further includes a first rubber pad 316 located between the first head 313 and the first filter element 312 .

In the illustrated embodiment of the present invention, the first head portion 313 is a machined part and is a one-piece structure. Such setting can save the mold opening cost. At the same time, the inlet and outlet holes of machined parts can be opened relatively large to meet the requirements of large flow. The first head 313 is threadedly connected to the first housing 311, so that when the first filter element 312 needs to be replaced, it is only necessary to unscrew the thread, and there is no need to replace the filter as a whole , thereby saving maintenance costs.

2 to 13, the first head portion 313 includes a first body portion 34, a first positioning portion 35 extending upward from one side of the first body portion 34, and a first positioning portion 35 located on the first body portion 34. There are two first mounting portions 36 on both sides of the bottom of the main body portion 34 , wherein the first positioning portion 35 is provided with a plurality of first positioning holes 351 for mounting and fixing the first filter 31 .

The first main body 34 includes two opposite sides 340 , a first inlet passage 341 passing through the two sides 340 , and a first outlet passage 342 passing through the two sides 340 . The first inlet channel 341 and the first outlet channel 342 are parallel to each other. The first inlet channel 341 respectively forms a first opening 3411 and a second opening 3412 on both sides of the first head 313; The third opening 3421 and the fourth opening 3422 are formed on both sides. Wherein, the first opening 3411 and the third opening 3421 are located on the same side of the first head 313 , and the second opening 3412 and the fourth opening 3422 are located on the same side of the first head 313 side. The first filter 31 further includes an inlet connector 343 inserted into the first opening 3411 and an outlet connector 344 inserted into the third opening 3421 .

Please refer to FIG. 9, the bottom of the first head 313 is also provided with a first crescent groove 3131 communicating with the first leakage hole 3151 on the first distribution plate 315 and a first crescent groove 3142 communicating with the first outlet space 3142. Connected outlet hole 3132 . Wherein the first crescent groove 3131 communicates with the first inlet channel 341 , and the outlet hole 3132 communicates with the first outlet channel 342 . The first mounting portion 36 is provided with a first mounting groove 363 penetrating transversely and a slot 364 communicating with the first mounting groove 363 and penetrating downwards, the first mounting groove 363 is parallel to the first inlet Channel 341.

The structure of the second filter 32 is very similar to that of the first filter 31, which is briefly described as follows.

The second filter 32 includes a second housing 321 , a second filter element (not shown) installed in the second housing 321 and a second head 323 matched with the second housing 321 .

The second housing 321 is identical to the first housing 311 , and the second filter element is identical to the first filter element 312 . A second inlet space (not shown) is formed between the second housing 321 and the second filter element, and the hollow part of the second filter element forms a second outlet space (not shown).

The second filter 32 also includes a second distribution plate 325 located at the upper end of the second inlet space, the second distribution plate 325 is provided with a plurality of second leakage holes 3251 distributed along the circumference, the second leakage The hole 3251 communicates with the second inlet space.

The bottom of the second head 323 is also provided with a second crescent groove 3231 communicating with the second leakage hole 3251 on the second distribution plate 325 and an outlet hole 3232 communicating with the second outlet space.

In the illustrated embodiment of the present invention, the second head portion 323 is a machined part and is a one-piece structure. Such setting can save the mold opening cost. At the same time, the inlet and outlet holes of machined parts can be opened relatively large to meet the requirements of large flow. The second head 323 is threadedly connected to the second housing 321, so that when the second filter element needs to be replaced, it is only necessary to unscrew the thread, and there is no need to replace the filter as a whole. Thereby saving maintenance cost.

2 to 13, the second head portion 323 includes a second body portion 37, a second positioning portion 38 extending upward from one side of the second body portion 37, and a second positioning portion 38 located on the second body portion 37. There are two second mounting portions 39 on both sides of the bottom of the main body portion 37 , wherein the second positioning portion 38 is provided with a plurality of second positioning holes 381 for mounting and fixing the second filter 32 .

The second main body portion 37 includes two opposite sides 370 , a second inlet passage 371 passing through the two sides 370 , and a second outlet passage 372 passing through the two sides 370 . The second inlet channel 371 and the second outlet channel 372 are parallel to each other. Wherein the second crescent groove 3231 communicates with the second inlet channel 371 , and the outlet hole 3232 communicates with the second outlet channel 372 . The second inlet channel 371 respectively forms a fifth opening 3711 and a sixth opening 3712 on both sides of the second head 323; The seventh opening 3721 and the eighth opening 3722 are formed on both sides. Wherein the fifth opening 3711 and the seventh opening 3721 are located on the same side of the second head 323 , and the sixth opening 3712 and the eighth opening 3722 are located on the same side of the second head 323 .

In the illustrated embodiment of the present invention, the first filter 31 and the second filter 32 are provided separately and assembled together detachably through a fixing piece; the second filter 32 and the third filter The filters 33 are provided separately and are detachably assembled together by fixing pieces. The fixing member includes a bolt 361 and a nut 362 matched with the bolt 361 . The first installation portion 36 is provided with a first installation groove 363 penetrating transversely, and the first installation groove 363 is parallel to the first inlet channel 341 . The second installation portion 39 is provided with a second installation groove 391 penetrating transversely and a slot 392 communicating with the second installation groove 391 and penetrating downwards. The second installation groove 391 is parallel to the second inlet channel 371 .

In the illustrated embodiment of the present invention, the first filter 31 and the second filter 32 are provided separately and assembled together detachably through a fixing piece; the second filter 32 and the third filter The filters 33 are provided separately and are detachably assembled together by fixing pieces. The fixing member includes a bolt 361 and a nut 362 matched with the bolt 361 .

When the first filter 31 and the second filter 32 are assembled with each other, the second opening 3412 is in contact with the fifth opening 3711 , and the fourth opening 3422 is in contact with the seventh opening 3721 . In order to improve sealing reliability, the filter assembly 3 further includes a first sealing ring 365 received in the second opening 3412 and a second sealing ring 366 received in the fourth opening 3422 . The first inlet channel 341 is aligned with the second inlet channel 371 , and the first outlet channel 342 is aligned with the second outlet channel 372 . The bolt 361 is accommodated in the first installation groove 363 along the transverse direction, the nut 362 is accommodated in the slot 392 from the bottom up, and the bolt 361 and the nut 362 are tightened. In this way, the fixing member detachably assembles the first head 313 of the first filter 31 and the second head 323 of the second filter 32 together.

Of course, it can be understood that the filter assembly 3 of the present invention has a sequential order during assembly, that is, the second filter 32 and the third filter 31 should be assembled first, that is, the bolt 361 is inserted into the second installation groove 391 and tightened with the nut 362 inserted in the third filter 31. Then, the first filter 31 and the second filter 32 are assembled to avoid assembly interference.

Referring to Fig. 12, the flow direction of the fluid of the present invention will be described below.

The first filter 31 , the second filter 32 and the third filter 33 are connected in parallel in flow mode.

First, the fluid flows into the first inlet channel 341 from the inlet joint 343, and a part of the fluid flows into the first crescent groove 3131, and passes through several first leakage holes 3151 on the first distribution plate 315, and enters the first inlet space 3141. The fluid permeates through the first filter element 312, enters the first outlet space 3142, then flows into the first outlet channel 342 through the outlet hole 3132, and finally leaves from the outlet joint 344; another part of the fluid flows into the second inlet channel 371, and then A part of the fluid flows into the second crescent groove 3231, and passes through several second leakage holes 3251 on the second distribution plate 325, and enters the third inlet space, and this part of the fluid permeates through the second filter element, enters the second outlet space, and then It then flows into the second outlet channel 372 through the outlet hole, and finally exits from the outlet joint 344 . The flow direction of the fluid in the third filter 33 is the same as that in the second filter 32 .

The first filter 31, the second filter 32 and the third filter 33 of the filter assembly 3 of the present invention are arranged separately and are detachably assembled together through fixing parts, which can realize a systematic design, and select suitable filters according to different application requirements. The number of filters can be combined, and the expansion ability is strong.

In addition, the above embodiments are only used to illustrate the present invention and not to limit the technical solutions described in the present invention. The understanding of this description should be based on those skilled in the art. It is throughout before, and for example, the directional descriptions such as "front", "rear", "left", "right", "upper" and "lower", although this specification has described the present invention with reference to the above-mentioned embodiments Detailed description, however, those of ordinary skill in the art should understand that those skilled in the art can still modify or equivalently replace the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be fall within the scope of the claims of the present invention.

Claims (9)

1. A filter assembly, which at least includes a first filter and a second filter, wherein the first filter includes a first housing, a first filter element located in the first housing, and the second A housing matched with a first head, the first head is provided with a first inlet channel and a first outlet channel; the second filter includes a second housing, a first filter located in the second housing Two filter elements and a second head matched with the second housing, the second head is provided with a second inlet passage and a second outlet passage; the first inlet passage communicates with the second inlet passage , the first outlet channel communicates with the second outlet channel, characterized in that: the first filter and the second filter are arranged separately and are detachably assembled together by a fixing member, and the fixing member detachably assembling the first head and the second head; The first inlet channel and the first outlet channel are parallel to each other, the second inlet channel and the second outlet channel are parallel to each other, the first inlet channel and the second inlet channel are aligned with each other, the the first outlet channel is aligned with the second outlet channel; The filter assembly also includes a first sealing ring installed between the first inlet passage and the second inlet passage, and a first sealing ring installed between the first outlet passage and the second outlet passage. Two sealing rings; The first inlet channel runs through the first head, respectively forming a first opening and a second opening on both sides of the first head; the first outlet channel also runs through the first head, respectively A third opening and a fourth opening are formed on both sides of the first head; wherein the first opening and the third opening are located on the same side of the first head, and the second opening and the The fourth opening is located on the same side of the first head; the second inlet channel runs through the second head, forming a fifth opening and a sixth opening on both sides of the second head; The second outlet channel also runs through the second head, forming a seventh opening and an eighth opening on both sides of the second head; wherein the fifth opening and the seventh opening are located in the second The same side of the head, the sixth opening and the eighth opening are located on the same side of the second head; the second opening is in contact with the fifth opening, and the fourth opening is in contact with the first The seven openings are in contact, the first sealing ring is located in the second opening, and the second sealing ring is located in the fourth opening. 2. The filter assembly of claim 1, wherein the first filter and the second filter are in parallel in flow connection. 3. The filter assembly according to claim 2, wherein the first filter includes a filter element located between the first filter element and the first housing and communicating with the first inlet passage. The first inlet space, and the first outlet space located in the first filter element and communicated with the first outlet passage; the second filter includes the second filter element located in the second shell A second inlet space between the bodies and communicated with the second inlet channel, and a second outlet space located in the second filter element and communicated with the second outlet channel. 4. The filter assembly according to claim 3, characterized in that: the first filter comprises a first distribution plate, the first distribution plate is provided with a number of first leakage holes distributed along the circumferential direction, the The first leakage hole communicates the first inlet channel with the first inlet space; the second filter includes a second distribution plate, and the second distribution plate is provided with several second leakage holes distributed along the circumferential direction. The second leakage hole communicates the second inlet channel with the second inlet space. 5. The filter assembly of claim 1, further comprising an inlet fitting inserted into the first opening and an outlet fitting inserted into the third opening. 6. The filter assembly according to claim 1, wherein the first casing is provided with a first cylindrical portion and a first connecting block welded on the top of the first cylindrical portion, the first The thickness of the connection block is greater than the wall thickness of the first cylinder part, and the first head and the first connection block are provided with external threads and internal threads that cooperate with each other, so that the first filter element can be detachable installed in the first casing. 7. The filter assembly according to any one of claims 1-6, wherein the fixing member comprises a bolt and a nut matched with the bolt. 8. The filter assembly according to claim 7, characterized in that: the first head is provided with a first mounting portion at its bottom, and the first mounting portion is provided with a first mounting groove penetrating transversely, The first installation groove is parallel to the first inlet passage; the second head is provided with a second installation part at its bottom, and the second installation part is provided with a slot penetrating downward; the bolt The nut is accommodated in the first installation groove, and the nut is accommodated in the slot. 9. The filter assembly according to claim 8, characterized in that: the second installation part is provided with a second installation groove transversely penetrating, the second installation groove is parallel to the second inlet channel, the The slot communicates with the second installation groove, and the second installation groove is used for accommodating bolts matched with the third filter.