CN111173598A - Plug-in assembled three-way catalyst - Google Patents

Abstract

The invention discloses an insertion type assembled three-way catalytic converter, which comprises: the tail gas guide assembly is internally provided with a filler space; a catalytic assembly comprising a packing separation cartridge and a carrier slip; the filler separating cylinder is fixed in the filler space, a plurality of longitudinally through separating spaces are distributed along the circumferential direction in the filler separating cylinder, and each carrier inserting strip is inserted and fixed in the corresponding separating space along the longitudinal direction; the inside of the carrier inserting strip is provided with a longitudinally through air-permeable channel; and the two ends of the tail gas guide assembly are respectively detachably connected with a front end cover and a rear end cover, and the front end cover and the rear end cover are respectively communicated with the front end and the rear end of the filler space. The invention can ensure that the carrier does not need to be integrally cleaned or replaced when being partially blocked, damaged or burnt, can save resources and reduce cost, and has high reusability and good durability; in addition, the defect that the high-temperature waste gas directly burns the gasket in the conventional three-way catalytic converter can be avoided.

Description

Plug-in assembled three-way catalyst

Technical Field

The invention relates to the technical field of automobile exhaust treatment, in particular to an insertion type assembled three-way catalyst.

Background

The three-way catalyst is installed outside the automobile exhaust system and can convert harmful gas, such as CO, HC, NOx, etc. exhausted from automobile exhaust into harmless carbon dioxide, water and nitrogen via oxidation and reduction. The three-way catalyst mainly comprises a shell, a gasket and a carrier; the carrier is divided into metal and rare earth ceramic, the shape is honeycomb, and the carrier with 400 meshes is mainly used at present. The carrier is coated with a catalyst coating layer for carrying out oxidation and reduction reactions with harmful gases, and the catalyst coating layer is formed by coating noble metals of platinum (Pt) and palladium (Pd) rhodium (Rh) on a honeycomb ceramic carrier in a form of rare earth metal oxide according to a certain proportion. Either platinum or palladium is used in combination with rhodium. Does not participate in chemical reaction as a catalyst.

The existing three-way catalyst is arranged at the front end of the exhaust of an engine, the temperature of exhaust gas entering the three-way catalyst can reach 850-950 degrees, the service life of the gasket can be shortened due to the fact that the gasket is burnt by high-temperature exhaust gas for a long time, and in the serious case, the function is invalid, so that the cracking of a carrier is caused, and the catalytic action is lost. Furthermore, existing three-way catalysts typically require periodic cleaning for the following reasons:

1. after the three-way catalyst is used for a long time, carbon deposit and other impurities discharged by an engine can cover the surface of the three-way catalyst on the carrier, so that precious metals cannot contact with tail gas, and the catalytic action cannot be achieved;

2. carbon deposit and other impurities discharged by the engine can block small holes of the three-way catalyst, so that exhaust back pressure is increased, and the engine has the symptoms of unstable idling, poor acceleration and the like.

However, the carrier of the existing three-way catalyst is honeycomb-shaped, so the cleaning process is difficult and incomplete. In addition, the existing cylindrical structure with the carrier integrated into one can only be integrally taken out for integral cleaning or replacement when the carrier needs to be cleaned or needs to be replaced (due to local breakage or burning loss).

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made in view of the problems occurring in the prior art.

Therefore, one of the objectives of the present invention is to provide an insert-type assembled three-way catalyst, which can solve the problem of resource waste caused by the overall cleaning or replacement of the existing three-way catalyst.

In order to solve the technical problems, the invention provides the following technical scheme: an insert-assembled three-way catalyst, comprising: the tail gas guide assembly is internally provided with a filler space; a catalytic assembly comprising a packing separation cartridge and a carrier slip; the filler separating cylinder is fixed in the filler space, a plurality of longitudinally through separating spaces are distributed in the filler separating cylinder along the circumferential direction, the number of the carrier inserting strips corresponds to the number of the separating spaces, and each carrier inserting strip is inserted into and fixed in the corresponding separating space along the longitudinal direction; the inside of the carrier inserting strip is provided with a longitudinally through air-permeable channel; and the two ends of the tail gas guide assembly are respectively detachably connected with a front end cover and a rear end cover, and the front end cover and the rear end cover are respectively communicated with the front end and the rear end of the filler space.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: the filler separating cylinder comprises a peripheral limiting cylinder and partition plates which are uniformly distributed in the limiting cylinder along the circumferential direction, the inside of the limiting cylinder is divided into a plurality of separating spaces with fan-shaped cross sections by the partition plates, and the carrier inserting strips are of strip-shaped structures matched with the inner contours of the separating spaces.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: the catalytic assembly also comprises a pulling rod fixed on each carrier inserting strip; the pulling rod comprises a straight rod section which is fixed on the carrier inserting strip and extends along the longitudinal direction and an operating head which is fixed at the end part of the straight rod section and extends out of the end part of the filler separating cylinder; the straight rod segment is sandwiched between the carrier slip and the packing spacer.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: the straight rod section with be fixed with along the locating part of longitudinal arrangement on the side of carrier cutting laminating, work as the straight rod section laminating in when on the carrier cutting, the locating part embedding the inside of carrier cutting makes the dead lever detachably is fixed in on the carrier cutting that corresponds.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: the tail gas guide assembly is internally provided with a flow guide channel communicated with the filler space; the front end cover is communicated with the filler space through the flow guide channel; the rear end cap is in communication with the filler space.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: and a primary filtering piece is arranged in the flow guide channel.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: the tail gas guide assembly comprises an interlayer cylinder and a bend cylinder which are nested with each other; the interlayer barrel comprises an outer barrel wall, an inner barrel wall positioned at the inner ring of the outer barrel wall, and a first barrel bottom connected between the outer barrel wall and the rear end of the inner barrel wall; an interlayer is formed between the outer cylinder wall and the inner cylinder wall, and the filling space is formed inside the inner cylinder wall; the redirection cylinder comprises a separation cylinder wall with one end inserted and fixed in the interlayer and a second cylinder bottom plugged on the other end of the separation cylinder wall; the interlayer forms the flow guide channel under the separation of the separation cylinder wall, and the flow guide channel comprises a first interlayer channel positioned between the separation cylinder wall and the outer cylinder wall and a second interlayer channel positioned between the separation cylinder wall and the inner cylinder wall; the primary filter piece is annular and is sleeved on the periphery of the inner cylinder wall and positioned inside the second interlayer channel.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: the catalytic assembly further comprises a limiting end cover connected to the front end of the inner cylinder wall, and the limiting end cover is located at the front end of the filler separating cylinder.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: the front end cover comprises a first connecting part in threaded connection with the front end of the tail gas guide assembly and a gas inlet pipe connected to the outer end of the first connecting part; the rear end cover comprises a second connecting part and an air outlet pipe, wherein the second connecting part is in threaded connection with the rear end of the tail gas guide assembly, and the air outlet pipe is connected to the outer end of the second connecting part.

As a preferable aspect of the insertion-type assembled three-way catalyst of the invention, wherein: the front end cover is in threaded connection with the front end of the outer cylinder wall, the rear end cover is in threaded connection with the rear end of the outer cylinder wall, the rear end cover faces the rear end of the filling space, the second cylinder bottom faces the front end of the filling space, and the front end cover is located on the periphery of the second cylinder bottom.

The invention has the beneficial effects that: the invention can ensure that the carrier does not need to be integrally cleaned or replaced when being partially blocked, damaged or burnt, can save resources and reduce cost, and has high reusability and good durability; in addition, the defect that the high-temperature waste gas directly burns the gasket in the conventional three-way catalytic converter can be avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

fig. 1 is an external structural view of an insert-assembled three-way catalyst.

Fig. 2 is an internal structural view of the insert-assembled three-way catalyst.

Fig. 3 is an exploded view of an insert-assembled three-way catalyst.

Fig. 4 is a sectional view of the insert-assembled three-way catalyst.

Fig. 5 is a detailed view of the structure at a in fig. 4.

Fig. 6 is a detailed view of the structure at B in fig. 4.

Fig. 7 is a view showing an end structure of the packing separation tube and the carrier slip.

FIG. 8 is a schematic view of the end structure of the packing separating cylinder, carrier slips, and stem and its partial detail.

Fig. 9 is a side view of a catalytic assembly.

Fig. 10 is a schematic view of the effect of the first vane on the exhaust gas transport path.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Referring to fig. 1 to 10, an embodiment of the present invention provides an insertion-type assembled three-way catalyst, which can eliminate the need for cleaning or replacing a carrier when the carrier is partially clogged, damaged, or burned, and can save resources and reduce costs.

The plug-in assembled three-way catalyst comprises an exhaust gas guide assembly 100 for guiding the exhaust gas in a roundabout manner, a catalytic assembly 200 for performing catalytic reaction on the exhaust gas, and a front end cover 300 and a rear end cover 400 which are respectively arranged at the front end and the rear end of the exhaust gas guide assembly 100. In the present invention, "front" is a direction corresponding to one end into which exhaust gas enters, and "rear" is a direction corresponding to one end from which exhaust gas is discharged.

The interior of the exhaust guide assembly 100 has a packing space M-1 for accommodating the catalytic assembly 200.

The catalytic assembly 200 includes a packing spacer 201 and a carrier slip 202.

The packing separation cylinder 201 is attached and fixed in the packing space M-1, a plurality of separation spaces 201a distributed along the circumferential direction of the packing separation cylinder 201 are arranged inside the packing separation cylinder 201, and each separation space 201a is a longitudinally-through strip-shaped hollow-out chamber. The carrier inserting strips 202 are provided with a plurality of (greater than or equal to 2), the number of the carrier inserting strips 202 corresponds to the number of the separation spaces 201a, and each carrier inserting strip 202 is detachably inserted and fixed in the packing separation cylinder 201, that is: each carrier slip 202 can be inserted and fixed in the corresponding partitioned space 201a in the longitudinal direction, respectively. The carrier insert 202 has longitudinally through air-permeable passages, preferably honeycomb-shaped passages inside the existing carrier, and the existing catalyst coating for carrying out oxidation and reduction reactions with harmful gases is coated on the surface of the carrier insert 202 and on the inner side walls of the air-permeable passages.

The front end cover 300 and the rear end cover 400 are detachably connected to two ends of the tail gas guide assembly 100, and are respectively communicated with the front end and the rear end of the packing space M-1. The exhaust gas can enter the filler space M-1 from the front end cap 300, fully contact the catalytic assembly 200, and be catalyzed by the catalytic assembly, and finally qualified exhaust gas is discharged from the rear end cap 400.

Based on the above, because the plurality of carrier slips 202 are assembled to form a complete "carrier" through the packing separation cylinder 201, and each carrier slip 202 can be pulled out of the corresponding separation space 201a, when the carrier is partially blocked or polluted, only one or more blocked carrier slips 202 need to be pulled out and cleaned, and the carrier does not need to be cleaned as a whole. Meanwhile, because the damage or burning loss of the carrier is not always fully affected at the end part, if the carrier is partially damaged or burnt, the carrier insert 202 corresponding to the damaged part can be pulled out and replaced without overall replacement, so that the material of the carrier and the precious metal resources of the catalyst coating are saved.

Further, the packing separation cylinder 201 comprises a peripheral limiting cylinder 201b and a plurality of partition plates 201c uniformly distributed in the limiting cylinder 201b along the circumferential direction. The limiting cylinder 201b is preferably matched with a cylindrical structure of the packing space M-1, the inner space of the limiting cylinder 201b is divided into a plurality of partition spaces 201a with sector cross sections by a plurality of partition plates 201c, and the carrier inserting strip 202 is of a strip-shaped structure matched with the inner contour of the partition spaces 201 a.

Further, the catalytic assembly 200 further includes a pulling rod 203 fixed to each carrier plug 202 to facilitate pulling the carrier plug 202 out of the compartment 201 a.

The pulling rod 203 comprises a straight rod section 203a which can be clasped and fixed on the carrier slip 202 and extends along the longitudinal direction, and an operating head 203b which is fixed at the end part of the straight rod section 203a and extends outwards from the end part of the filler separating cylinder 201, and the pulling rod 203 and the carrier slip 202 fixed with the pulling rod 203 can be pulled out by outwards pulling the operating head 203 b. The straight rod section 203a is a long rod structure which is attached to the outer surface of the carrier slip 202 and extends longitudinally, after the straight rod section 203a and the corresponding carrier slip 202 are fixed in the corresponding separation space 201a, the carrier slip 202 is clamped between the carrier slip 202 and the packing separation barrel 201, preferably, a groove which is matched with the straight rod section 203a is arranged on the outer surface of the carrier slip 202, and the straight rod section 203a can be laid in the groove, so that a modular structure which can be tightly attached to the inner surface of the separation space 201a can be formed together with the carrier slip 202. Further preferably, the pulling rod 203 may also be disposed at the central angle position of the fan-shaped carrier slip 202.

Further, one or more limiting members 203c arranged along the longitudinal direction are fixed on one side surface of the straight rod segment 203a, which is attached to the carrier slip 202, for clasping and fixing the straight rod segment 203a and the carrier slip 202 together. When the straight rod segment 203a is attached to the carrier slip 202, the limiting member 203c is embedded in the carrier slip 202, and the pulling rod 203 is detachably fixed to the corresponding carrier slip 202. Preferably, the limiting member 203c may be a conical tip structure or a short column structure extending laterally outward, and the carrier strip 202 has a slot matching with the limiting member 203c, and the limiting member 203c can be embedded into the slot to realize the limiting of the longitudinal relative sliding.

Further, the exhaust guide assembly 100 is provided with a flow guide passage M-2 therein, which is communicated with the packing space M-1. The front end cover 300 is detachably connected to the front end of the tail gas guide assembly 100 and is communicated with the filler space M-1 through a flow guide channel M-2; the rear end cap 400 is detachably coupled to the rear end of the exhaust guide assembly 100 and is communicated with the packing space M-1. In the present invention, the packing space M-1 is used for accommodating the catalytic assembly 200, and the flow guide channel M-2 is used for guiding the exhaust gas entering the guide assembly 100 to the catalytic assembly 200 in the packing space M-1 for catalytic process. Because of the roundabout conduction of the diversion channel M-2, the waste gas can be cooled, and simultaneously, carbon deposit and other impurities carried in the waste gas are mostly blocked and precipitated, so that the blockage and burning loss degree of the waste gas to the catalytic assembly 200 are reduced.

When the plug-in assembled three-way catalyst works, waste gas enters the flow guide channel M-2 of the tail gas guide assembly 100 from the front end cover 300, enters the filler space M-1 through the circuitous conduction of the flow guide channel M-2 to fully contact with the catalytic assembly 200, is catalyzed by the filler space M-1, and finally qualified tail gas is discharged from the rear end cover 400.

Further, the front end cover 300 includes a first connection portion 301 screwed to the front end of the exhaust guide assembly 100, and an air inlet pipe 302 connected to an outer end of the first connection portion 301. Specifically, the first connecting portion 301 is shaped like a hopper, the outer end of the first connecting portion is an air inlet pipe 302 extending outward, and the inner side wall of the inner end is provided with an internal thread matched with the front end of the tail gas guiding assembly 100.

The rear end cap 400 includes a second connection portion 401 threadedly coupled to the rear end of the exhaust guide assembly 100, and an outlet pipe 402 coupled to an outer end of the second connection portion 401. Specifically, the second connecting portion 401 is shaped like a hopper, the outer end of the second connecting portion is an outward extending air outlet pipe 402, and the inner side wall of the inner end is provided with an internal thread matched with the rear end of the tail gas guiding assembly 100. In the present invention, the front end cap 300 and the rear end cap 400 have the same structure and are symmetrically arranged, and both are of an integrated structure.

Further, the inside of the flow guide passage M-2 is provided with a preliminary filter 500, which is packed at one or more positions in the flow guide passage M-2. The primary filter 500 is made of rare earth ceramic, the interior of the primary filter is provided with densely arranged longitudinal air-permeable channels, the peripheral outline of the primary filter is matched with the internal cross section structure of the flow guide channel M-2, the waste gas carrying carbon deposit and other impurities can be firstly subjected to primary filtration and treatment of the primary filter 500 before entering the catalytic assembly 200, and the heat loss and pollution of the waste gas to the catalytic assembly 200 are greatly reduced, so that the primary filter 500 can be generally and directly cleaned or replaced without taking out the catalytic assembly 200 when the primary filter is cleaned regularly. Of course, the inner and outer sides of the preliminary filter 500 are respectively wrapped with a gasket to play a role in buffering, shock absorption, impact resistance, sealing and heat stress relief.

Further, the exhaust gas guiding assembly 100 comprises a sandwich cylinder 101 and a redirection cylinder 102 which are nested with each other, and the sandwich cylinder and the redirection cylinder are nested with each other and can form a filler space M-1 and a circuitous flow guiding channel M-2.

Specifically, the sandwiched cylinder 101 includes an outer cylinder wall 101a, an inner cylinder wall 101b positioned at an inner circle of the outer cylinder wall 101a, and a first bottom 101c connected between the outer cylinder wall 101a and a rear end of the inner cylinder wall 101 b. Therefore, an interlayer 101d having an open front end and a closed rear end can be formed between the outer cylinder wall 101a and the inner cylinder wall 101 b; and the inner part of the inner cylindrical wall 101b can form a filler space M-1 with two front and rear ends penetrating.

The redirecting tube 102 includes a partition tube wall 102a inserted and fixed in the interlayer 101d at one end, and a second tube bottom 102b sealed at the other end of the partition tube wall 102 a. Specifically, the bend cylinder 102 has a cylindrical structure with one end open and the other end closed by the second cylinder bottom 102b, the open end of the bend cylinder is inserted and fixed in the interlayer 101d, and the closed end at the other end is exposed out of the interlayer cylinder 101. The interlayer 101d forms a circuitous flow guide channel M-2 under the separation of the separation cylinder wall 102a, and the flow guide channel M-2 comprises a first interlayer channel M-21 between the separation cylinder wall 102a and the outer cylinder wall 101a and a second interlayer channel M-22 between the separation cylinder wall 102a and the inner cylinder wall 101 b. That is, the longitudinal section of the sandwich layer 101d in a certain section can form a C-shaped channel, one port of the C-shaped channel is communicated with the front end cap 300, the other port is communicated with the front end of the packing space M-1, and the rear end of the packing space M-1 is communicated with the rear end cap 400.

Based on the structure of the exhaust gas guiding assembly 100, the primary filter 500 of the present invention is annular, and is sleeved on the outer periphery of the inner cylinder wall 101b and located inside the second interlayer channel M-22.

The open end of the partition cylindrical wall 102a is fixed in the interlayer 101d in the following manner: the outer edge of the opening end of the partition cylindrical wall 102a is provided with a connecting outer edge 102c folded outward and a connecting ring 102d fixed to the end of the connecting outer edge 102c and capable of being screwed to the inside of the outer cylindrical wall 101 a. The connecting outer edge 102c and the connecting ring 102d are annular structures, and are integrally formed at the open end of the partition cylinder wall 102a to form a structure with an L-shaped longitudinal section. A plurality of ventilation holes 102c-1 are arranged on the connecting outer edge 102c along the circumferential direction, so that the gas in the first interlayer channel M-21 can enter the second interlayer channel M-22 through the ventilation holes 102 c-1. The outer side wall of the connecting ring 102d is provided with a first external thread 102d-1, and the inner side surface of the outer cylinder wall 101a is provided with a first internal thread 101a-1 matched with the first external thread 102 d-1.

Based on the structure of the exhaust gas guiding assembly 100, the front end cap 300 is in threaded connection with the front end of the outer cylinder wall 101a, the inner side wall of the inner end of the first connection portion 301 is provided with a second internal thread 301a, and the outer side wall of the front end of the outer cylinder wall 101a is provided with a second external thread 101a-2 matched with the second internal thread 301 a; the rear end cap 400 is in threaded connection with the rear end of the outer cylinder wall 101a, a third internal thread 401a is arranged on the inner side wall of the inner end of the second connecting portion 401, and a third external thread 101a-3 matched with the third internal thread 401a is arranged on the outer side wall of the rear end of the outer cylinder wall 101 a. The rear end cover 400 faces the rear end of the packing space M-1, the second cylinder bottom 102b faces the front end of the packing space M-1, and the front end cover 300 is located on the periphery of the second cylinder bottom 102 b.

Further, in order to improve the primary filtering effect of the flow guide channel M-2 on the impurities in the exhaust gas and reduce the damage of the impurities on the primary filter element 500 and the catalytic assembly 200, the invention sets that: the partition cylinder wall 102a is provided with a first blade 102a-1 which is arranged longitudinally, the first blade 102a-1 is arranged obliquely, and the outer end of the first blade faces to have a component in the direction of the front end of the catalytic assembly 200; the inner cylindrical wall 101b is provided with second vanes 101b-2 arranged longitudinally, and the second vanes 101b-2 are arranged obliquely with their outer ends directed with a component in the direction of the rear end of the catalytic assembly 200.

Preferably, the partition cylinder wall 102a is alternately provided with a first blade group Y-1 and a second blade group Y-2 at equal intervals along the longitudinal direction, and each blade group comprises a plurality of first blades 102a-1 distributed at equal intervals along the circumferential direction. The first blades 102a-1 distributed on the first blade group Y-1 and the second blade group Y-2 are complementary in longitudinal projection and can form a complete circular ring together in longitudinal projection. Therefore, as shown in fig. 10, the exhaust gas which collides with each blade of the first blade group Y-1 can accumulate a part of impurities on the group of blades, then passes through the blade gap of the first blade group Y-1, and the blade distributions on the first blade group Y-1 and the second blade group Y-2 are complementary in the longitudinal projection, so that the exhaust gas which passes through the blade gap of the first blade group Y-1 can directly collide with each blade of the second blade group Y-2 again, then passes through the blade gap of the second blade group Y-2 and collides with the next first blade group Y-1 … …, and thus the exhaust gas circularly and reciprocally collides and advances in the longitudinal direction, thereby realizing primary filtration of the exhaust gas impurities and contact cooling of the exhaust gas.

In the present invention, the arrangement and arrangement of the second blades 101b-2 on the inner cylindrical wall 101b is also the same as the arrangement and arrangement of the first blades 102a-1 on the partition cylindrical wall 102a (the first blade group Y-1 and the second blade group Y-2 are alternately arranged on the inner cylindrical wall 101b at equal intervals along the longitudinal direction), which is not described herein again.

Further, the catalytic assembly 200 further comprises a limit end cap 204 connected to the front end of the inner cylinder wall 101b, wherein the limit end cap 204 is located at the front end of the packing separation cylinder 201 and is used as a blocking member for the front end of the packing space M-1 to prevent the packing separation cylinder 201 inserted from the rear end of the packing space M-1 from being embedded too deeply into the second cylinder bottom 102 b. The limit end cap 204 includes an annular connecting portion 204a screwed to the outer sidewall of the inner cylindrical wall 101b, a grating 204b disposed at an inner ring of a front end of the annular connecting portion 204a, and a pressing ring 204c disposed at a rear end of the annular connecting portion 204 a.

The inner side wall of the annular connecting portion 204a is provided with a fourth internal thread 204a-1, and the outer side wall of the front end of the inner cylinder wall 101b is provided with a fourth external thread 101b-3 matched with the fourth internal thread 204 a-1. The grill 204b is a circular grill structure that fits the contour of the inner ring of the annular connecting portion 204 a. The pressing ring 204c is an annular convex structure at the rear end of the annular connecting portion 204 a.

A circle of limiting rings 101b-1 are fixed on the outer side wall of the inner cylinder wall 101b, the limiting rings 101b-1 are of a circle of annular convex structures, and when the limiting end cover 204 is connected to the front end of the inner cylinder wall 101b, the preliminary filter piece 500 can be clamped between the extrusion ring 204c and the limiting rings 101b-1 to achieve positioning.

Further, the catalytic assembly 200 further comprises a gland 205 connected to the rear end of the inner cylinder wall 101b, the gland 205 is located at the rear end of the packing separation cylinder 201 and is used as a blocking member at the rear end of the packing space M-1, and the gland and the limiting end cap 204 can jointly clamp the packing separation cylinder 201 in the middle to longitudinally position the packing separation cylinder 201 and the carrier insert 202.

Specifically, the gland 205 includes an outer ring body 205a, a pressing block 205b located at the center of the outer ring body 205a, and a plurality of tie bars 205c engaged between the outer ring body 205a and the pressing block 205b, wherein the tie bars 205c are uniformly arranged in the outer ring body 205a along the circumferential direction. The outer side surface of the outer ring body 205a is provided with a fifth external thread 205a-1, the inner side wall of the rear end of the inner cylinder wall 101b is provided with a fifth internal thread 101b-4 matched with the fifth external thread 205a-1, and the outer ring body 205a is detachably connected to the rear end of the inner cylinder wall 101b through the matching of the fifth external thread 205a-1 and the fifth internal thread 101 b-4.

The pressing block 205b faces the operating head 203b extending from the end of each of the pulling rods 203, and preferably, the operating head 203b is an exposed end bent into an L shape and has elasticity. When the outer ring body 205a is rotatably connected to the rear end of the inner cylinder wall 101b, it can squeeze the rear end edge of the filler separation cylinder 201 to limit the rearward sliding thereof, and at the same time, the pressing block 205b can approach and uniformly squeeze each operating head 203b, so that the pulling rod 203 has a tendency of pressing inward against each corresponding carrier insert 202 to prevent the rearward sliding thereof. Because the operating head 203b has certain elasticity, the carrier insert 202 clamped in the middle has certain anti-seismic telescopic space, and the risk of breakage is reduced.

It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (10)

1. An insertion type assembled three-way catalyst is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

an exhaust gas guide assembly (100) having a packing space (M-1) therein;

a catalytic assembly (200) comprising a packing spacer (201) and a carrier slip (202); the packing separation cylinder (201) is fixed in the packing space (M-1), a plurality of separation spaces (201a) which are distributed along the circumferential direction and are longitudinally through are arranged inside the packing separation cylinder (201), the number of the carrier inserts (202) corresponds to the number of the separation spaces (201a), and each carrier insert (202) is respectively inserted and fixed in the corresponding separation space (201a) along the longitudinal direction; the interior of the carrier insert (202) is provided with a longitudinally through air-permeable channel;

two ends of the tail gas guide assembly (100) are respectively detachably connected with a front end cover (300) and a rear end cover (400), and the front end cover and the rear end cover are respectively communicated with the front end and the rear end of the filler space (M-1).

2. The plug-in assembled three-way catalyst of claim 1, wherein: the packing separating cylinder (201) comprises a peripheral limiting cylinder (201b) and partition plates (201c) uniformly distributed in the limiting cylinder (201b) along the circumferential direction, the inside of the limiting cylinder (201b) is divided into a plurality of separating spaces (201a) with sector cross sections by the partition plates (201c), and the carrier inserting strips (202) are of strip-shaped structures matched with the inner profiles of the separating spaces (201 a).

3. An insert-assembled three-way catalyst according to claim 1 or 2, characterized in that: the catalytic assembly (200) further comprises a puller rod (203) fixed to each carrier slip (202);

the pulling rod (203) comprises a straight rod section (203a) which is fixed on the carrier slip (202) and extends along the longitudinal direction, and an operating head (203b) which is fixed at the end part of the straight rod section (203a) and extends out of the end part of the filler separating cylinder (201); the straight rod segment (203a) is sandwiched between the carrier slip (202) and the packing separation barrel (201).

4. The plug-in assembled three-way catalyst of claim 3, wherein: and the straight rod section (203a) and one side surface attached to the carrier slip (202) are fixedly provided with limiting parts (203c) arranged along the longitudinal direction, and when the straight rod section (203a) is attached to the carrier slip (202), the limiting parts (203c) are embedded into the carrier slip (202), so that the pulling rod (203) is detachably fixed on the corresponding carrier slip (202).

5. An insert-assembled three-way catalyst as claimed in any one of claims 1, 2 or 4, wherein: the interior of the tail gas guide assembly (100) is also provided with a flow guide channel (M-2) communicated with the filler space (M-1);

the front end cover (300) is communicated with the packing space (M-1) through the flow guide channel (M-2); the rear end cap (400) is in communication with the packing space (M-1).

6. An insert-assembled three-way catalyst as claimed in claim 5, wherein: a primary filter element (500) is arranged in the flow guide channel (M-2).

7. An insert-assembled three-way catalyst as claimed in claim 6, wherein: the tail gas guide assembly (100) comprises a sandwich cylinder (101) and a redirection cylinder (102) which are nested with each other;

the interlayer cylinder (101) comprises an outer cylinder wall (101a), an inner cylinder wall (101b) positioned at the inner ring of the outer cylinder wall (101a), and a first cylinder bottom (101c) connected between the outer cylinder wall (101a) and the rear end of the inner cylinder wall (101 b); an interlayer (101d) is formed between the outer cylinder wall (101a) and the inner cylinder wall (101b), and the filling space (M-1) is formed inside the inner cylinder wall (101 b);

the redirecting cylinder (102) comprises a separating cylinder wall (102a) with one end inserted and fixed in the interlayer (101d), and a second cylinder bottom (102b) sealed on the other end of the separating cylinder wall (102 a); the interlayer (101d) forms the flow guide channel (M-2) under the separation of the separation cylinder wall (102a), and the flow guide channel (M-2) comprises a first interlayer channel (M-21) between the separation cylinder wall (102a) and the outer cylinder wall (101a) and a second interlayer channel (M-22) between the separation cylinder wall (102a) and the inner cylinder wall (101 b); the primary filter piece (500) is annular and is sleeved on the periphery of the inner cylinder wall (101b) and positioned inside the second interlayer channel (M-22).

8. The plug-in assembled three-way catalyst of claim 7, wherein: the catalytic assembly (200) further comprises a limiting end cover (204) connected to the front end of the inner cylinder wall (101b), and the limiting end cover (204) is located at the front end of the filler separating cylinder (201).

9. An insert-assembled three-way catalyst according to any one of claims 1, 2, 4 or 6 to 8, wherein: the front end cover (300) comprises a first connecting part (301) in threaded connection with the front end of the tail gas guide assembly (100) and an air inlet pipe (302) connected to the outer end of the first connecting part (301);

the rear end cover (400) comprises a second connecting part (401) in threaded connection with the rear end of the tail gas guide assembly (100) and a gas outlet pipe (402) connected to the outer end of the second connecting part (401).

10. The plug-in assembled three-way catalyst of claim 9, wherein: the front end cover (300) is in threaded connection with the front end of the outer cylinder wall (101a), the rear end cover (400) is in threaded connection with the rear end of the outer cylinder wall (101a), the rear end cover (400) is over against the rear end of the packing space (M-1), the second cylinder bottom (102b) is over against the front end of the packing space (M-1), and the front end cover (300) is located on the periphery of the second cylinder bottom (102 b).

Images