CN106902582B

CN106902582B - Rigid member for mounting filter element to orifice plate and filter structure using same

Info

Publication number: CN106902582B
Application number: CN201710293237.7A
Authority: CN
Inventors: 谭险峰
Original assignee: CHENGDU RUIKELIN ENGINEERING TECHNOLOGY CO LTD
Current assignee: CHENGDU RUIKELIN ENGINEERING TECHNOLOGY CO LTD
Priority date: 2017-04-28
Filing date: 2017-04-28
Publication date: 2023-05-05
Anticipated expiration: 2037-04-28
Also published as: CN106902582A

Abstract

The invention discloses a rigid component for installing a filter element on an orifice plate and a filter structure using the rigid component, which are used for solving the problem of concentrated pretightening force between a shoulder and the orifice plate in the background art. The filter element applicable to the rigid component comprises a filter part and a connecting part positioned at the end part of the filter part, wherein the connecting part forms a shoulder relative to the filter part, and the end surface of the shoulder far away from the filter part is provided with a clean gas outlet communicated with the inner cavity of the filter part; the rigid member comprises a side wall part which is arranged on the side face of the shoulder and extends along the side edge of the shoulder, a bending part which is formed by bending the edge of the side wall part and is used for being buckled on the end face of the shoulder far away from the filtering part or the end face close to the filtering part so as to uniformly press the shoulder and the pore plate in the length range of the side edge of the shoulder, thereby realizing the sealing contact, and a stress part which is used for realizing the pre-tightening connection between the rigid member and the pore plate through a pre-tightening piece.

Description

Rigid member for mounting filter element to orifice plate and filter structure using same

Technical Field

The invention relates to the technical field of filtration, in particular to a rigid member for mounting a filter element on a pore plate and a filter structure using the same.

Background

In order to obtain a clean gas, both industrially and civilian, dust removal from the gas by filtration is the most basic method. In general, some of the dust contained in the gas is a dust that can be settled, and some of the dust is suspended particulate matter. Suspended particulate matter in a gas refers to particles suspended in the gas that do not readily settle. The particle size of suspended particles in the air is generally less than or equal to 100 microns; wherein, suspended particles with the particle size less than or equal to 10 microns are also called PM10, and the particle size less than or equal to 2.5 microns are also called PM2.5.

In order to facilitate the sedimentation of dust, the existing filter dust removing apparatus generally fixes the filter element by positioning the upper end of the filter element and sets the lower side of the filter element as a space for the sedimentation of dust. For example, the applicant of the present invention has adopted this conventional design for a front-end dust collector for a turbine type gas compressor as provided in the patent application publication CN103089714a (hereinafter referred to as reference).

In order to more actually describe the front-end dust collector of the turbine type gas compressor, the applicant has now described in connection with fig. 1 of the present specification (which is a practical design drawing closer to the front-end dust collector of the turbine type gas compressor). As shown in fig. 1, the dust remover comprises a filter element 100, an orifice plate 210, a clean air box 300 and a back blowing system 600, wherein the clean air box 300 is arranged above a bracket 800, and is provided with an air outlet 310 and a climbing frame 320; the filter element 100 is installed below the purified gas box 300 through the pore plate 210, so that the inner cavities of the filter element 100 and the purified gas box 300 are communicated through the purified gas outlet at the upper end of the filter element to form a purified gas transmission channel, and the outer side of the filter element is open except the bracket at the lower part; the back blowing system comprises a gas bag 610, a pulse valve 620 and a blowing pipe 630 which are sequentially connected, wherein the gas bag 610 and the pulse valve 620 are positioned at the top of the clean gas box 300, and the blowing pipe 630 extends from the top of the clean gas box 300 downwards to the height of the clean gas box 300 close to the orifice plate 210 and then extends along the direction parallel to the orifice plate, so that a blowing port arranged on the blowing pipe 630 is aligned with a clean gas outlet on the corresponding filter element 100.

When the dust remover operates, under the action of the fan, raw gas (i.e. gas to be filtered, here air to be filtered) enters the periphery of the filter element 100 from the open space, passes through the filter element 100 and becomes clean gas (i.e. filtered gas), the clean gas enters the clean gas box 300 from the inner cavity of the filter element 100 and finally is discharged from the exhaust port 310 of the clean gas box 300, dust trapped by the filter element 100 is gathered on the surface of the filter element to form a filter cake, and some dust is settled on the ground below the filter element and some dust is suspended in the space around the filter element. When the dust accumulated on the surface of the filter element is thicker, the blowback system 600 can be started to blow back to clean the filter element. In addition, maintenance of the air bag 610, pulse valve 620 may be operated by lifting from the climbing frame to the top of the net air box.

As mentioned above, the front-end dust collector of the turbine type gas compressor fixes the filter element by positioning the upper end of the filter element and sets the lower part of the filter element as a space for dust to settle. Indeed, filter dust removal devices of similar principles known to the inventors of the present invention are basically also provided with filter elements in this way. In general, there is no obvious problem with this arrangement of the filter element, and at the same time, this is to facilitate sedimentation of the dust, so that no careful thought has been found and the problems with this approach have been addressed.

However, the inventors of the present invention have noted the following problems and phenomena: (1) Since the filter element is located below the air purifying box, in order to make room for the filter element, the air purifying box must be supported by a bracket (or by a structure such as a housing of the filter dust removing device), and the air purifying box is often a relatively large and heavy component in the filter dust removing device, so that a structure with relatively high supporting strength must be designed to support the air purifying box. (2) In the case of this dust collector, it was found that after a considerable period of operation, there was no substantial settling dust on the ground below and around the filter element, the dust trapped by the filter element adhering mainly to the filter element or being suspended in the atmosphere after blowback. (3) There is a significant uneven distribution of the dust thickness adhering to the filter element, i.e. the dust thickness on the filter element gradually increases from top to bottom. The reason for this was determined after analysis: under the influence of gravity, the concentration of dust (mainly suspended particles) in the raw gas is gradually increased from top to bottom, so that more dust contacts below the filter element and less dust contacts above the filter element; in addition, because the purified gas outlet is positioned at the upper end of the filter element, the pressure of the back-blowing air flow entering the inner cavity of the filter element from the purified gas outlet during back blowing is gradually attenuated from top to bottom, and therefore, the back-blowing effect above the filter element is better than that below. The two factors are overlapped, namely, the dust thickness of the filter element is gradually thickened from top to bottom.

On the other hand, the front-end dust collector of the turbine type gas compressor of the reference also uses a specially designed filter element. As can be seen from the reference document, the filter element comprises a filter part formed by at least two parallel filter tubes, an upper connecting part (i.e. a first end connector 402 in the reference document) positioned at the upper end of the filter part, and a lower connecting part (i.e. a second end connector 403 in the reference document) positioned at the lower end of the filter part, wherein the upper ends of the filter tubes are connected into a whole through the upper connecting part, the lower ends of the filter tubes are connected into a whole through the lower connecting part, and a clean gas outlet (i.e. a vent hole 402a in the reference document) communicated with the inner cavity of each filter tube is arranged on the upper end face of the upper connecting part. In order to facilitate the mounting and positioning of the filter element, the upper connecting portion forms a shoulder (see fig. 2 to 4 of the reference), which is in sealing contact with the perforated plate via its end face adjacent to the filter portion (in the reference an annular sealing band 402b is provided on the end face of the shoulder adjacent to the filter portion to achieve this), and the filter element is finally fastened to the perforated plate via a pressure plate above the shoulder (i.e. pressure plate 9 of the reference).

In this reference, since the shoulder is provided above the orifice plate, the filter element is required to be installed by passing the filter element through the through hole in the orifice plate from top to bottom, which not only results in less convenient installation of the filter element, but also requires a larger size of the through hole in the orifice plate because the size of the through hole in the orifice plate must be capable of allowing the filter portion and the lower connection portion of the filter element to pass therethrough, and thus requires a thicker orifice plate to ensure the strength of the orifice plate. In view of such problems, in fig. 1 of the present specification, the improvement is that the shoulder of the filter element is in sealing contact with the orifice plate through the end surface thereof away from the filter part, so that the filter element is only required to be mounted on the orifice plate from bottom to top. The concrete installation mode is that the two ends of the shoulder are respectively and directly fixed on the pore plate through threaded fasteners. However, whether the press plate of the reference or the threaded fastener of fig. 1 of the present description is used, one problem is not solved at all times, namely: the pretightening force between the convex shoulder and the pore plate is concentrated on the local position of the convex shoulder, and the tightness between the filter element and the pore plate can be influenced over time.

Disclosure of Invention

A first object of the present invention is to provide a device for filtering suspended particles from a gas, which solves the problem of how to effectively improve the uneven thickness distribution of dust on a filter element as mentioned in the background art.

A second object of the present invention is to provide a rigid member for mounting a filter element to an orifice plate and a filter structure using the same, so as to solve the problem of the concentration of the pretightening force between the shoulder and the orifice plate mentioned in the background art.

In order to achieve the first object described above, according to one aspect of the embodiments of the present invention, there is provided an apparatus for filtering suspended particulate matter from a gas, the apparatus including a filter element mounted on a purge tank by a positioning device so that lumens of both the filter element and the purge tank communicate through a purge outlet at an end of the filter element to form a purge gas transmission passage, a positioning device, a purge tank, and a back-blowing system connected to the purge tank, the purge outlet being located at a lower end of the filter element and the purge tank being disposed at a bottom of the filter element.

Further, the positioning device comprises a pore plate used for forming an upper cover of the clean air box, the lower end of the filter element is arranged on the pore plate through a connecting structure, and the clean air output port of the filter element is communicated with the inner cavity of the clean air box through a through hole arranged on the pore plate.

Further, the filter element comprises a filter part consisting of at least two filter tubes arranged in parallel, an upper connecting part positioned at the upper end of the filter part and a lower connecting part positioned at the lower end of the filter part, wherein the upper ends of the filter tubes are connected into a whole through the upper connecting part, the lower ends of the filter tubes are connected into a whole through the lower connecting part, a clean gas outlet communicated with the inner cavities of the filter tubes is arranged on the lower end face of the lower connecting part, and the filter element is arranged on the pore plate through a connecting structure acting on the lower connecting part.

Further, an annular sealing belt surrounding each clean gas outlet is arranged on the lower end face of the lower connecting part; when the filter element is mounted on the orifice plate by the connection structure acting on the lower connection portion, the annular sealing band is pressed between the lower end face of the lower connection portion and the orifice plate.

Further, the lower connecting portion forms a shoulder with respect to the filter portion, the shoulder having a side as seen in a depth direction of the filter portion; the connecting structure comprises a pretension piece and a rigid component, wherein the rigid component comprises a side wall part which is arranged on the side face of the shoulder and extends along the side edge of the shoulder, a bending part which is formed by bending the edge of the side wall part and is used for being buckled on the end face of the shoulder close to the filtering part so as to uniformly press the shoulder and the pore plate in the length range of the side edge of the shoulder, and a stress part which is used for realizing pretension connection between the rigid component and the pore plate through the pretension piece.

Further, the rigid member is a section bar with a C-shaped cross section, the section bar comprises two side wall parts respectively arranged at two sides of the shoulder and a bending part connected between the two side wall parts, and the bending part is provided with a through hole for the filter part to pass through.

Further, the means for filtering suspended particulate matter from the gas comprises at least two of said filter elements; and the rigid member is a section bar with a U-shaped cross section, and the section bar comprises two side wall parts respectively arranged between the shoulders of the adjacent filter elements, two bending parts respectively formed by bending the edges of the two side wall parts, and a transition part connected between the two side wall parts.

Further, the upper connecting portion is formed by a sealing plate which also serves as a closed end of each filter tube.

Further, the filter tube comprises an inner tube layer composed of a porous high density polyethylene support and an outer tube layer attached to the outer surface of the inner tube and composed of an expanded polytetrafluoroethylene filter membrane.

Further, the purge bin doubles as a base for supporting the positioning device and the filter element.

Further, a supporting frame arranged on the air purifying box is arranged above the air purifying box, and an auxiliary positioning connecting piece is arranged between the supporting frame and the filter element.

Further, a housing mounted on the clean air box is arranged above the clean air box, the filter element is accommodated in the housing, and an air inlet structure is arranged on the housing.

Further, the device for filtering suspended particulate matters from the gas further comprises a back-flushing system; the back blowing system comprises an air bag, a pulse valve and a blowing pipe which are sequentially connected, wherein the air bag and the pulse valve are arranged on the outer side face of the clean air box, and the blowing pipe extends into the clean air box from the outer side face of the clean air box to act on a corresponding clean air output port.

Further, the means for filtering suspended particulate matter from the gas comprises at least two filter elements; the air bag extending along the periphery of the air purifying box is arranged on the outer side surface of the air purifying box, a plurality of pulse valves which are arranged at intervals along the length direction of the air bag and are respectively connected with the air bag are arranged above the air bag, the pulse valves are correspondingly connected with blowing pipes perpendicular to the side wall of the air purifying box, the blowing pipes act on the corresponding filter elements, and blowing ports corresponding to air purifying output ports on the corresponding filter elements are arranged on the blowing pipes.

In order to achieve the above-described second object, according to one aspect of the embodiments of the present invention, there is now provided a rigid member for mounting a filter element to an orifice plate, the filter element to which the rigid member is applied including a filter portion and a connecting portion at an end of the filter portion, the connecting portion forming a shoulder with respect to the filter portion, the shoulder being provided on an end face thereof remote from the filter portion with a purge gas outlet communicating with an inner cavity of the filter portion, and the shoulder being in sealing contact with the orifice plate through an end face thereof remote from the filter portion or through an end face thereof close to the filter portion, the shoulder further having a side edge as viewed in a depth direction of the filter portion; the rigid member comprises a side wall part which is arranged on the side face of the shoulder and extends along the side edge of the shoulder, a bending part which is formed by bending the edge of the side wall part and is used for being buckled on the end face of the shoulder far away from the filtering part or the end face close to the filtering part so as to uniformly press the shoulder and the pore plate in the length range of the side edge of the shoulder, thereby realizing the sealing contact, and a stress part which is used for realizing the pre-tightening connection between the rigid member and the pore plate through a pre-tightening piece.

Further, the filter element for which the rigid member is applicable is a filter element in which the end face of the shoulder away from the filter part is in sealing contact with the orifice plate; the rigid member is then a profile having a C-shaped cross section, the profile comprising: two side wall parts respectively arranged at two sides of the shoulder and a bending part connected between the two side wall parts, wherein a through hole for the filter part to pass through is arranged on the bending part.

Further, the bending part extends to the outside of the filtering part along the long edge of the shoulder to form a stress part.

Further, the filter element for which the rigid member is applicable is a filter element in which the end face of the shoulder away from the filter part is in sealing contact with the orifice plate; the rigid member is then a profile having a U-shaped cross section, the profile comprising: two side wall parts respectively arranged between the shoulders of the adjacent filter elements, two bending parts respectively formed by bending the edges of the two side wall parts, and a transition part connected between the two side wall parts.

Further, the transition portion doubles as a force receiving portion for achieving a pretensioned connection between the rigid member and the orifice plate by the pretensioning member.

According to another aspect of the embodiment of the invention, there is provided a filter structure using the above rigid member, the filter structure including a filter element and an orifice plate, and further including the rigid member adapted to be connected with the filter element, and a pretensioner for pretensioning connection between a force receiving portion of the rigid member and the orifice plate.

Further, the pretension piece adopts a threaded fastener.

Further, the pre-tightening piece adopts a handle type propping device, the handle type propping device comprises a supporting seat, a transmission mechanism, a propping rod and a handle, the supporting seat is arranged on a supporting member which is arranged on the side face of the filter element and is fixedly arranged with the pore plate, the transmission mechanism is arranged on the supporting seat and is respectively connected with the propping rod and the handle, when the handle is operated, the head part of the propping rod can be pressed by the stress part by moving the propping rod forwards, so that pre-tightening connection is realized between the rigid member and the pore plate, and when the handle is operated, the head part of the propping rod can be separated from the stress part by moving the propping rod backwards.

According to the device for filtering suspended particles from gas, provided by the invention, as the clean gas outlet is positioned at the lower end of the filter element and the clean gas box is arranged at the bottom of the filter element, the device has the following beneficial effects: firstly, aiming at the characteristic that the dust concentration in the raw gas is gradually increased from top to bottom under the influence of gravity, the pressure of the back-blowing air flow entering the inner cavity of the filter element from the air purifying outlet during back-blowing is gradually attenuated from bottom to top, namely, in the depth direction of the filter element, the pressure of the back-blowing air flow at the position with higher dust concentration in the raw gas is correspondingly higher, so that the phenomenon of uneven thickness distribution of dust on the filter element after the device is used for a long time can be improved. Secondly, in the structure that air purifying box, positioner, filter element and blowback system constitute, because the air purifying box of big, weight is put down and has reduced the focus of this structure, help optimizing the bearing structure of whole device, stability when improving the device operation. Furthermore, although the underlying purge bin appears to interfere with the settling of dust, in fact, since the present device filters suspended particulate matter (and of course also allows for some amount of settleable particulate matter) from the gas, there is no risk of significant dust accumulation in the upper part of the purge bin, thereby affecting the use of the device.

According to the rigid member for mounting the filter element on the pore plate and the filter structure using the rigid member provided by the invention, based on the innovative design of the rigid member, the filter structure has the following beneficial effects: because the whole kink that the edge bending formation of side wall portion and side wall portion has higher rigidity in filter element's depth direction, buckle when the kink and press on the corresponding terminal surface of convex shoulder can make between convex shoulder and the orifice plate evenly compress tightly on the length scope of the side of convex shoulder, prevent that the pretightning force between convex shoulder and the orifice plate from concentrating excessively to sealing effect between convex shoulder and the orifice plate has been guaranteed well.

The invention is further described below with reference to the drawings and examples. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 is a schematic view of a front-end dust collector of a turbine type gas compressor according to the references provided in the background art.

Fig. 2 is a schematic diagram of an apparatus for filtering suspended particulate matter from a gas according to an embodiment of the present invention.

Fig. 3 is a left side view of fig. 2.

Fig. 4 is a schematic view of a filter element according to an embodiment of the present invention.

Fig. 5 is a bottom view of fig. 4.

Fig. 6 is a schematic view of a filter structure employing a rigid member according to an embodiment of the present invention.

Fig. 7 is a left side view of fig. 6.

Fig. 8 is a schematic view of a filter structure employing a rigid member according to an embodiment of the present invention.

Fig. 9 is a schematic view of a rigid member according to an embodiment of the invention.

Fig. 10 is a schematic view of a rigid member according to an embodiment of the invention.

It should be noted that:

the broken lines in fig. 1 and 2 indicate the range of cut-away to show the partial cross-section of the internal configuration of the device.

The broken lines in fig. 3, 9 and 9 indicate that portions other than the broken lines are omitted.

Detailed Description

It should be noted that, without conflict, the embodiments herein and the features therein may be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings in conjunction with the following.

In order that those skilled in the art will better understand the present invention, a technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.

The embodiment of the invention provides a device for filtering suspended particles from gas. Fig. 2 is a schematic diagram of an apparatus for filtering suspended particulate matter from a gas according to an embodiment of the present invention.

As shown in fig. 2, the device comprises a filter element 100, a positioning device 200, a clean air box 300 and a back blowing system 600, wherein the filter element 100 is installed on the clean air box 300 through the positioning device 200, the filter element 100 is a filter element with a clean air output port at the end, when the filter element 100 is installed on the clean air box 300 through the positioning device 200, the inner cavities of the filter element 100 and the clean air box 300 are communicated through the clean air output port at the end of the filter element 100 to form a clean air transmission channel, the back blowing system 600 is connected with the clean air box 300, and the clean air box 300 is arranged at the bottom of the filter element 100. Since the purge tank 300 is provided at the bottom of the filter element 100, the purge outlet of the filter element 100 is also correspondingly located at the lower end of the filter element 100.

In operation of the apparatus, under the action of the blower, raw gas enters the periphery of the filter element 100, passes through the filter element 100 and becomes purified gas, and the purified gas enters the purified gas tank 300 below the filter element 100 from the inner cavity of the filter element 100 and finally is discharged from the gas outlet (see the gas outlet 310 shown in fig. 3) of the purified gas tank 300. When the dust accumulated on the surface of the filter element 100 is thicker, the blowback system 600 can be started to blow back to clean the filter element 100.

The use of the blowback system 600 to blowback clean the filter element 100 is a conventional technique for filter dust removal equipment. During back blowing, the back blowing air flow enters the inner cavity of the filter element 100 from the clean air outlet of the filter element 100, and then acts on dust on the surface of the filter element 100, so that the dust is peeled off from the filter element 100, and the permeability of the filter element 100 is restored to a certain extent.

According to the above-described apparatus, since the clean air outlet is located at the lower end of the filter element 100 and the clean air tank 300 is provided at the bottom of the filter element 100, the clean air outlet is formed by: firstly, aiming at the characteristic that the dust concentration in the raw gas gradually increases from top to bottom under the influence of gravity, the pressure of the back-blowing air flow entering the inner cavity of the filter element 100 from the air purifying outlet during back-blowing also gradually decays from bottom to top, namely, in the depth direction of the filter element 100, the pressure of the back-blowing air flow at the position with the larger dust concentration in the raw gas is correspondingly larger, so that the phenomenon of uneven thickness distribution of dust on the filter element 100 after the device is used for a long time can be improved. It should be noted that the term "depth direction of the filter element" as used herein refers to a direction in which one end of the clean air outlet of the filter element is located and the opposite end (i.e., the closed end of the filter element) is located.

Secondly, in the main structure of the device composed of the air purifying box 300, the positioning device 200, the filtering element 100 and the back blowing system 600, the gravity center of the main structure is lowered due to the fact that the air purifying box 300 with large volume and heavy weight is arranged below, so that the support structure of the whole device is optimized, and the stability of the device in operation is improved.

In addition, although the lower purge bin 300 appears to prevent the settling of dust, in fact, since the present apparatus filters suspended particulate matter mainly from the gas, there is no case where a large amount of dust is accumulated on the upper portion of the purge bin 300 to affect the operation of the apparatus; in addition, the back-blowing air flow sprayed outwards from the inner cavity of the filter element 100 during back-blowing can scatter dust settled on the upper part of the air purifying box 300, so that dust is prevented from accumulating on the upper part of the air purifying box 300.

Generally, the positioning device 200 includes an orifice plate 210 for forming an upper cover of the clean air tank 300, the lower end of the filter element 100 is mounted on the orifice plate 210 through a connection structure (an embodiment of the connection structure will be described with reference to fig. 6 to 10), and the clean air outlet of the filter element 100 is in communication with the inner cavity of the clean air tank 300 through a through hole provided in the orifice plate 210.

The orifice plate 210 is a conventional technical means for installing the filter element 100, and the installation of the filter element 100 through the orifice plate 210 is simple in structure, and a plurality of filter elements 100 can be conveniently installed on the same orifice plate 210 to increase the filtering area of the device. However, orifice plate 210 is not the only means by which the lower end of filter element 100 may be mounted to clean air tank 300 and the interior of filter element 100 may be in communication with the interior of clean air tank 300 in embodiments of the present invention. It is also one of the possible ways to mount the filter element 100 by other means, such as by a joint connecting the lower end of the filter element 100 with the purge tank 300.

Because the clean air box 300 is relatively large and heavy, the clean air box 300 can also serve as a base for supporting the positioning device 200 and the filter element 100, and at this time, the bottom of the clean air box 300 can be no longer provided with a supporting structure for supporting the clean air box 300, so that the clean air box 300 can be directly placed on the ground.

As shown in fig. 2, according to one embodiment of the present invention, the means for filtering suspended particulate matter from the gas is to place the purge bin 300 on a support 800 above the ground. This is mainly because the device of this embodiment is a modified product based on the device shown in fig. 1, so that it is necessary to ensure the same height of the exhaust ports 310 of the net gas boxes 300 of the two devices during the design process, so as to avoid modification of the pipes connected to the exhaust ports 310.

As can be seen from a comparison of fig. 1 and 2, when the device shown in fig. 2 is at the same height as the exhaust port 310 of the clean air box 300 of the device shown in fig. 1, the installation height of the filter element 100 in the embodiment of the present invention will be significantly higher than the installation height of the filter element 100 in the device shown in fig. 1 because the embodiment of the present invention is that the filter element 100 is disposed above the clean air box 300 and the device shown in fig. 1 is that the filter element 100 is disposed below the clean air box 300. It has been pointed out above that under the influence of gravity the dust concentration in the raw gas increases gradually from top to bottom, in other words the higher the installation height of the filter element 100 the lower the dust concentration in the raw gas it contacts. Thus, the filter element 100 of the present embodiment will be less contaminated with dust from the raw gas than the device of fig. 1.

According to an embodiment of the present invention, on the basis of any one of the foregoing possible embodiments, a support frame 400 mounted on the clean air box 300 is further disposed above the clean air box 300, and an auxiliary positioning connection member 230 is disposed between the support frame 400 and the filter element 100. Thus, the positioning can be performed by the auxiliary positioning connector 230, and the stability of the filter element 100 can be improved.

The structure of the auxiliary positioning connector 230 can be designed more freely, and generally, the auxiliary positioning connector 230 is only installed on the supporting frame 400 to limit the position of the filter element 100 in a certain direction.

In accordance with an embodiment of the present invention, in addition to any one of the foregoing possible embodiments, a housing 500 mounted on the clean air box 300 is further disposed above the clean air box 300, the filter element 100 is accommodated in the housing 500, and an air intake structure 510 (see the air intake structure 510 shown in fig. 3) is disposed on the housing 500.

The main purpose of the housing 500 is to protect the filter element 100. When the present apparatus is used as an air filtering dust removing device placed outdoors, the housing 500 can prevent rainwater from directly contacting the filter element 100.

On the basis of the technical solutions of any one of the foregoing possible embodiments, as a preferred implementation manner of the blowback system 600, the blowback system 600 includes a gas bag 610, a pulse valve 620 and a blowing pipe 630 connected in sequence, where the gas bag 610 and the pulse valve 620 are installed on an outer side surface of the clean gas tank 300, and the blowing pipe 630 extends into the clean gas tank 300 from the outer side surface of the clean gas tank 300 to act on a corresponding clean gas outlet.

Because the air bag 610 and the pulse valve 620 are directly installed on the outer side surface of the air purifying box 300, the blowing pipe 630 extends into the air purifying box 300 from the outer side surface of the air purifying box 300 to act on the corresponding air purifying outlet, so that the path of the back blowing air flow from the pulse valve 620 to the corresponding air purifying outlet 131 through the blowing pipe 630 is shorter, the turning process of turning the back blowing air flow along the direction parallel to the orifice plate after the back blowing air flow from the top of the air purifying box 300 to the height close to the orifice plate 210 in the air purifying box 300 from top to bottom in fig. 1 is not needed, and the pressure loss of the back blowing air flow is smaller; in addition, since the blowback system 600 is disposed at the side of the purge bin 300, maintenance of the blowback system 600 can also be facilitated.

An embodiment of the present invention is described in detail below with reference to fig. 3.

Fig. 3 is a left side view of fig. 2. As best seen in fig. 3, the purge bin 300 and the exhaust port 310 of the purge bin 300, the enclosure 500 and the intake structure 510 on the enclosure 500, and the blowback system 600 disposed on the side of the purge bin 300.

Wherein the air intake structure 510 is designed as a grid-like opening so as to communicate the space within the housing 500 with the outside atmosphere. The air intake structure 510 is designed based on the device of the corresponding embodiment as an air filtering dust removing apparatus placed outdoors. The intake structure 510 may also be modified accordingly, depending on the application of the invention.

When at least two filter elements 100 are provided in the embodiment of the present invention, the blowback system 600 is more preferably configured as follows: the outer side surface of the air purifying box 300 is provided with an air bag 610 extending along the periphery of the air purifying box 300, a plurality of pulse valves 620 which are arranged at intervals along the length direction of the air bag 610 and are respectively connected with the air bag 610 are arranged above the air bag 610, each pulse valve 620 is correspondingly connected with a blowing pipe 630 which is vertical to the side wall of the air purifying box 300, each blowing pipe 630 acts on the corresponding filter element 100, and each blowing pipe 630 is provided with a blowing port which corresponds to the air purifying outlet 131 on the corresponding filter element 100.

Embodiments of the present invention are described in detail below with reference to fig. 4 to 5.

Fig. 4 is a schematic view of a filter element according to an embodiment of the present invention. Fig. 5 is a bottom view of fig. 4. As shown in fig. 4 and 5, the filter element 100 includes a filter part 110 formed by at least two filter tubes 111 arranged in parallel, an upper connection part 120 positioned at the upper end of the filter part 110, and a lower connection part 130 positioned at the lower end of the filter part 110, wherein the upper ends of the filter tubes 111 are connected into a whole through the upper connection part 120, the lower ends of the filter tubes 111 are connected into a whole through the lower connection part 130, a clean gas outlet 131 communicated with the inner cavity of each filter tube 111 is arranged on the lower end surface of the lower connection part 130, and the filter element 100 is mounted on the orifice plate 210 through a connection structure 220 acting on the lower connection part 130.

Preferably, the upper connection portion 120 is formed of a sealing plate which also serves as a closed end of each filter tube 111.

Preferably, the filter tube 111 includes an inner tube layer formed of a porous high density polyethylene support 111 and an outer tube layer attached to the outer surface of the inner tube and formed of an expanded polytetrafluoroethylene filter membrane 112.

Regarding the above-described filter element 100, its construction is similar to that of the patent application document of chinese patent publication No. CN103089714a (i.e., the reference document provided in the background), and can be understood in conjunction with the contents of this reference document.

The difference from the filter element in the reference is that: in the embodiment of the invention, the filter element 100 is provided with an annular sealing belt 132 surrounding each clean gas outlet 131 on the lower end surface of the lower connecting part 130; when the filter element 100 is mounted on the orifice plate 210 by the connection structure 220 acting on the lower connection 130, the annular sealing band 132 is compressed between the lower end surface of the lower connection 130 and the orifice plate 210. In the reference document, however, an annular sealing band is provided on the end face of the lower connecting portion 130 adjacent to the filter portion 110.

Based on the above-mentioned differences, the filter element 100 according to the embodiment of the present invention does not need to pass through the orifice plate 210 at the lower connection portion 130 when being mounted to the orifice plate 210, so that the difficulty of mounting the filter element 100 is reduced and the open area of the orifice plate 210 can be reduced.

As shown in fig. 4 and 5, the lower connecting portion 130 forms a shoulder 700 with respect to the filtering portion 110, and the shoulder 700 has a side 710 as seen in the depth direction of the filtering portion 110. Shoulder 700 is a step, thereby providing for ease of installation and positioning.

In fig. 2 to 3, the lower end of filter element 100 is specifically mounted on orifice plate 210 by means of connection structures provided between shoulder 700 and orifice plate 210, which are threaded fasteners provided at both ends of shoulder 700 for connecting shoulder 700 to orifice plate 210, respectively. Although this manner of connecting shoulder 700 to orifice plate 210 via threaded fasteners is relatively simple, the preload between shoulder 700 and orifice plate 210 is too concentrated and can affect the sealing effect between shoulder 700 and orifice plate 210.

Embodiments of the present invention are described in detail below with reference to fig. 6 to 10.

To address the problem of too concentrated a preload force between shoulder 700 and orifice plate 210, in accordance with an embodiment of the present invention, the connection structure with rigid member 222 is provided.

Fig. 6 is a schematic view of a filter structure employing a rigid member according to an embodiment of the present invention. Fig. 7 is a left side view of fig. 6. Fig. 9 is a schematic view of the rigid member shown in fig. 6. As shown in fig. 6, 7 and 9, the connection structure 220 includes a pre-tightening member 221 and a rigid member 222, wherein the rigid member 222 includes a side wall portion 222a for being provided at a side surface of the shoulder 700 and extending along a side edge 710 of the shoulder 700, a bent portion 222b formed by bending an edge of the side wall portion 222a for being buckled on an end surface of the shoulder 700 near the filter portion 110 so as to uniformly compress the shoulder 700 and the orifice plate 210 over a length of the side edge 710 of the shoulder 700, and a force receiving portion 222c for achieving a pre-tightening connection between the rigid member 222 and the orifice plate 210 by the pre-tightening member 221.

Specifically, the rigid member 222 is a section bar with a C-shaped cross section, which includes two side wall portions 222a respectively disposed at two sides of the shoulder 700 and a bending portion 222b connected between the two side wall portions 222a, and the bending portion 222b is provided with a through hole 222e through which the filtering portion 110 passes. As best seen in fig. 6 and 9, the rigid member 222 is C-shaped in cross-section. The rigid member 222 may be formed by bending a steel plate having high rigidity.

As can be seen in fig. 7 and 9, the bend 222b extends along the side 710 of the shoulder 700 beyond the filter portion 110 to form a force receiving portion 222c. While the pre-tightening member 221 may use a threaded fastener to pre-tightly couple the force receiving portion 222c to the orifice plate 210.

Because the pretensioner 221 is more difficult to handle because of the multiple twists required to use the threaded fastener, a handle-type tightening mechanism that is easy to operate can also be used. As shown in fig. 6 and 7, the handle-type tightening device comprises a supporting seat 221a, a transmission mechanism 221b, a tightening rod 221c and a handle 221d, wherein the supporting seat 221a is arranged on a supporting member 410 which is positioned on the side surface of the filter element and fixedly arranged with the pore plate 210, the transmission mechanism 221b is arranged on the supporting seat 221a and respectively connected with the tightening rod 221c and the handle 221d, when the handle 221d is operated to move forward the tightening rod 221c, the head of the tightening rod 221c can be pressed against a force-receiving part 222c, so that the rigid member 222 and the pore plate 210 can be in pre-tightening connection, and when the handle 221d is operated to move backward the tightening rod 221c, the head of the tightening rod 221c can be separated from the force-receiving part 222c. The support member 410 may be fixed to the support frame 400 mounted on the net gas tank 300 as described above.

Fig. 8 is a schematic view of a filter structure employing a rigid member according to an embodiment of the present invention. Fig. 10 is a schematic view of the rigid member shown in fig. 8. As shown in fig. 8 and 10, the rigid member is a profile having a U-shaped cross section, and the profile includes two side portions 222a respectively for being disposed between shoulders 700 of adjacent filter elements 100, two bent portions 222b respectively formed by bending edges of the two side portions 222a, and a transition portion 222d connected between the two side portions 222 a. Preferably, the transition portion 222d doubles as a force receiving portion 222c for achieving a pretensioned connection between the rigid member and the orifice plate 210 by the pretensioning member 221; the pre-tightening piece 221 may be a threaded fastener, or may be a handle-type tightening device as described above.

Claims

1. A rigid component for mounting a filter element to an orifice plate, the applicable filter element comprising a filter portion (110) and a connecting portion at the end of the filter portion, the connecting portion forming a shoulder (700) with respect to the filter portion, the end surface of the shoulder (700) remote from the filter portion (110) being provided with a purge gas outlet (131) communicating with the interior cavity of the filter portion (110), and the shoulder (700) being in sealing contact with the orifice plate (210) through the end surface thereof remote from the filter portion (110) or through the end surface thereof close to the filter portion (110), the shoulder (700) further having a side edge (710) as seen in the depth direction of the filter portion (110), characterized in that: the rigid member comprises a side wall part (222 a) which is arranged on the side surface of the shoulder (700) and extends along the side edge (710) of the shoulder (700), a bending part (222 b) which is formed by bending the edge of the side wall part (222 a) and is used for being buckled on the end surface of the shoulder (700) far away from the filter part (110) or the end surface close to the filter part (110) so as to uniformly press the shoulder (700) and the pore plate (210) in the length range of the side edge (710) of the shoulder (700) to realize the sealing contact, and a stress part (222 c) which is used for realizing the pre-tightening connection between the rigid member and the pore plate (210) through a pre-tightening piece (221).

2. A rigid member as claimed in claim 1 wherein: the applicable filter element is a filter element that the end surface of the shoulder (700) far away from the filter part (110) is in sealing contact with the pore plate (210); the rigid member is then a profile having a C-shaped cross section, the profile comprising: two side wall parts (222 a) respectively arranged at two sides of the shoulder (700) and a bending part (222 b) connected between the two side wall parts (222 a), wherein the bending part (222 b) is provided with a through hole for the filter part (110) to pass through.

3. A rigid member as claimed in claim 2 wherein: the bending part (222 b) extends to the outside of the filtering part (110) along the side edge (710) of the shoulder (700) to form a stress part (222 c).

4. A rigid member as claimed in claim 1 wherein: the applicable filter element is a filter element that the end surface of the shoulder (700) far away from the filter part (110) is in sealing contact with the pore plate (210); the rigid member is then a profile having a U-shaped cross section, the profile comprising: two side walls (222 a) each for being arranged between shoulders (700) of adjacent filter elements (100), two bent portions (222 b) each formed by bending edges of the two side walls (222 a), and a transition portion (222 d) connected between the two side walls (222 a).

5. The rigid member of claim 4 wherein: the transition portion (222 d) also serves as a force receiving portion (222 c) for realizing a pretensioned connection between the rigid member and the orifice plate (210) by means of the pretensioning member (221).

6. Filter structure using the rigid member of any of claims 1 to 5, comprising a filter element (100) and an orifice plate (210), characterized in that: also included is the rigid member (222) adapted to connect with the filter element (100) and a pretensioner (221) to pretension the rigid member (222) between the force bearing portion (222 c) and the aperture plate (210).

7. The filter structure of claim 6, wherein: the pre-tightening piece (221) adopts a threaded fastener.

8. The filter structure of claim 6, wherein: the pre-tightening piece (221) adopts a handle type tightening device, the handle type tightening device comprises a supporting seat (221 a), a transmission mechanism (221 b), a tightening rod (221 c) and a handle (221 d), the supporting seat (221 a) is arranged on a supporting component (410) which is arranged on the side face of the filter element and fixedly arranged with the pore plate (210), the transmission mechanism (221 b) is arranged on the supporting seat (221 a) and is respectively connected with the tightening rod (221 c) and the handle (221 d), when the handle (221 d) is operated, the tightening rod (221 c) is moved forwards, the head part of the tightening rod (221 c) can be pressed by the force-bearing part (222 c), so that pre-tightening connection is realized between the rigid component (222) and the pore plate (210), and when the handle (221 d) is operated, the head part of the tightening rod (221 c) can be separated from the force-bearing part (222 c) by backward movement of the tightening rod (221 c).