Metal carrier back pressure testing tool for assisting tail gas purification

Abstract

The utility model discloses a metal carrier back pressure test tool for assisting tail gas purification. A carrier comprises a shell and an inner core, and two ends of the shell are longer than the inner core to form a hollow section. The backpressure testing tool comprises a circular truncated cone body with a big-end-down outer diameter and an inner through hole, a positioning step surface is arranged in the inner through hole to divide the inner through hole into two sections with big-end-up, the carrier penetrates into the upper section of the inner through hole, and the lower end of the carrier is matched with the positioning step surface in an abutting manner; at least two annular grooves are formed in the inner wall of the upper section of the inner through hole, annular sealing rings are embedded in the annular grooves, and the peripheral wall of the carrier is tightly attached to the inner walls of the annular sealing rings; the positioning step face further extends upwards to form an annular protruding edge, an expansion structure is arranged on the protruding edge, and the protruding edge penetrates into the hollow section at the lower end of the carrier and is in expansion fit with the inner wall of the hollow section through the expansion structure. The structure can be matched with a small-diameter carrier, butt joint use of the small-diameter carrier and a fluid test board can be achieved without replacing the flow test board, and the positioning stability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of catalytic converter test tooling, in particular to a back pressure test tooling for a metal carrier for auxiliary exhaust gas purification. Background Art

[0002] A catalytic converter is the most important off-vehicle purification device installed in an automobile exhaust system, which can convert harmful gases such as CO, HC, and NOx discharged from automobile exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction. In the prior art, a large-diameter catalytic converter carrier is directly clamped on a flow test bench for back pressure testing. However, for a small-diameter carrier, due to the mismatched caliber, it cannot be tested. Therefore, it is necessary to design a back pressure test tooling suitable for small-diameter metal carriers and used in conjunction with a flow test bench.

[0003] The patent with publication number CN218444265U discloses a special mold for catalytic converter back pressure testing, including a pressure measurement bench. Both sides of the pressure measurement bench are provided with mold bodies, and each mold body is composed of an upper mold body and a lower mold body. The upper mold body is fixed to the lower mold body by four positioning pins and sliding columns, and the upper mold body can slide up and down. Four lock catches are arranged outside the joint of the upper mold body and the lower mold body, and each lock catch is composed of a lock ring and a lock hook. Two silica gel rings are embedded on the inner cavity side surface of the mold body. The lower one is a solid silica gel ring, and part of the solid silica gel ring protrudes outside the mold wall. The upper one is a hollow silica gel ring. An oval catalytic converter body is placed vertically upside down from above the mold body until it contacts and squeezes tightly with the solid silica gel ring in the mold cavity. The outer lock catches are respectively buckled, and the upper mold body moves downward, so that the hollow silica gel ring deforms and protrudes to squeeze the outer wall of the catalytic converter, forming a supporting force and a seal. In the above structure, the bottom of the carrier is supported on the solid silica gel ring, and the installation limit is only achieved by the squeezing force. It is easy to shake under the flow back pressure test, resulting in inaccurate measurement data. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the above problems and provide a back pressure test tooling for a metal carrier for auxiliary exhaust gas purification with better positioning stability and suitable for small-diameter carriers.

[0005] The technical solution of the utility model is as follows:

[0006] A metal carrier backpressure test tool for auxiliary exhaust gas purification, wherein the carrier includes a housing and a core, and both ends of the housing are longer than the core to form a hollow section. It is characterized in that: the backpressure test tool includes a frustum with a smaller upper diameter and a larger lower diameter and an inner through hole. A positioning step surface is provided in the inner through hole to divide the inner through hole into two sections with a larger upper part and a smaller lower part. The carrier is inserted into the upper section of the inner through hole, and the lower end of the carrier abuts against the positioning step surface; at least two annular grooves are provided on the inner wall of the upper section of the inner through hole, and annular sealing rings are embedded in the annular grooves, and the outer peripheral wall of the carrier is closely attached to the inner wall of the annular sealing ring;

[0007] An annular convex edge also extends upward on the positioning step surface, and a tightening structure is provided on the convex edge. The convex edge penetrates into the hollow section at the lower end of the carrier and is tightly fitted with the inner wall of the hollow section through the tightening structure.

[0008] In this structure, the large-diameter end of the lower part of the frustum is docked with the flow test bench, and the inner through hole is used to connect the metal carrier, so as to realize the test use of the small-diameter metal carrier on the flow bench; among them, a positioning step surface for abutting against the end of the carrier is provided in the inner through hole to form a bottom support function, and multiple sealing rings are used to realize the tight positioning and effective sealing of the outer peripheral wall. At the same time, an annular convex edge and a tightening structure are added to form an internal tightening positioning for the hollow section of the carrier. Multiple methods are combined to effectively ensure the reliability and stability of the carrier installation and improve the accuracy of data during the test.

[0009] Further, in the metal carrier backpressure test tool for auxiliary exhaust gas purification of the present utility model, the tightening structure includes an inner tightening cylinder concentrically inserted into the convex edge, and a plurality of tightening slits opened at the upper end of the convex edge. The inner tightening cylinder includes a conical section and a threaded section arranged in sequence from top to bottom. The inner wall of the convex edge and the conical section are in conical surface fit, and the inner wall of the lower section of the inner through hole and the threaded section are connected through threaded fit. By rotating the inner tightening cylinder to drive its conical section to move in the up and down direction, due to the conical surface fit between the convex edge and the conical section, each part of the convex edge divided by the tightening slit is extruded outward to be tightly fitted with the inner wall of the hollow section of the carrier, improving the positioning stability of the carrier.

[0010] Further, in the metal carrier backpressure test tool for auxiliary exhaust gas purification of the present utility model, a hand-held part is provided on the lower end surface of the inner tightening cylinder. The hand-held part includes at least one spoke passing through the center of the circle and connecting with the inner wall of the inner tightening cylinder at both ends, which is convenient for applying a rotating acting force to the inner tightening cylinder.

[0011] Further, in the metal carrier backpressure test tool for auxiliary exhaust gas purification of the present utility model, the tightening slits are evenly distributed along the circumferential direction of the convex edge and the number is 4-6, ensuring uniform tightening in all circumferential directions.

[0012] Furthermore, in the back pressure test tooling for the metal carrier for auxiliary exhaust gas purification described in the utility model, friction lines are provided on the outer wall of the convex edge to increase the friction between the convex edge and the hollow section of the carrier and enhance the expansion and tightening positioning effect.

[0013] Furthermore, in the back pressure test fixture of the metal carrier for auxiliary exhaust gas purification described in the utility model, the annular sealing ring is made of rubber and its inner diameter is 1-2 mm smaller than the outer diameter of the carrier to ensure the sealing effect.

[0014] The beneficial effects of the utility model are:

[0015] The utility model has a simple structure and a reasonable design, and can be used to adapt to small-diameter metal carriers. Without changing the flow test bench, only an auxiliary tooling needs to be added to realize the back pressure test of the small-diameter metal carrier.

[0016] The carrier installation and positioning of the utility model has high stability. The positioning step surface designed on the inner through hole is used to provide a stable bottom supporting function for the carrier. Multiple sealing rings are combined to perform efficient sealing and extrusion positioning on the outer circumferential direction of the carrier. At the same time, a convex edge and an expansion structure are added to perform expansion and positioning on the inner circumferential direction of the hollow section of the carrier. The combination of multiple positioning methods makes the installation more stable, and it is not easy to loosen or shake during the test, and the sealing performance is good, which effectively ensures the accuracy of the back pressure test.

[0017] The utility model utilizes a convex edge to penetrate into the interior of a carrier, and through the cooperation of an inner expansion tube, the convex edge, an expansion seam, a tapered section, and a threaded section, the convex edge is elastically deformed to expand the hollow section of the carrier outward, which is beneficial to improving the connection tightness with the carrier, and the operation is simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model in use state in coordination with a carrier.

[0019] Figure 2 for Figure 1 Enlarged schematic of the circle.

[0020] Figure 3 It is a cross-sectional schematic diagram of the utility model after the inner expansion tube is removed.

[0021] Figure 4 The structure of the inner expansion cylinder is shown in FIG. Figure 1 .

[0022] Figure 5 The structure of the inner expansion cylinder is shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0023] The utility model is now further described in conjunction with the accompanying drawings:

[0024] Referring to Figure 1 、 Figure 2 As shown, in this embodiment, a metal carrier backpressure test tool for auxiliary exhaust gas purification is provided. The carrier 1 includes an outer shell 1a and an inner core 1b, and both ends of the outer shell 1a are longer than the inner core 1b to form a hollow section 1c. This structure can easily complete the backpressure test of small-diameter metal carriers by adding an auxiliary tool without changing the flow test bench.

[0025] The backpressure test tool includes a frustum 2 with a smaller upper diameter and a larger lower diameter and an inner through hole 9. A positioning step surface 3 is provided in the inner through hole 9 to divide the inner through hole 9 into two sections with a larger upper part and a smaller lower part. The carrier 1 is inserted into the upper section of the inner through hole 9, and the lower end of the carrier 1 abuts against the positioning step surface 3. The larger diameter of the lower part of the frustum 2 can form a base for clamping and placing on the flow test bench for testing. The inner through hole 9 is used for inserting and installing the carrier 1. Relying on the positioning step surface 3 of the inner through hole 9 to abut against the lower end face of the outer shell of the carrier 1, a bottom support force is formed.

[0026] At least two annular grooves are provided on the inner wall of the upper section of the inner through hole 9, and annular sealing rings 4 are embedded in the annular grooves. The outer peripheral wall of the carrier 1 is closely attached to the inner wall of the annular sealing ring 4. The annular sealing ring 4 is made of rubber and its inner diameter is 1-2 millimeters smaller than the outer diameter of the carrier 1. With the above structure, efficient sealing and good circumferential positioning effects are achieved through the deformation and extrusion of multiple sealing rings between the outer peripheral wall of the carrier 1 and the inner through hole 9, ensuring the stable installation of the carrier 1 and preventing air leakage.

[0027] An annular convex edge 5 also extends upward on the positioning step surface 3, and a tightening structure is provided on the convex edge 5. The convex edge 5 is inserted into the hollow section 1c at the lower end of the carrier 1 and is tightly fitted with the inner wall of the hollow section 1c through the tightening structure.

[0028] Specifically, in combination with Figures 2 - 4The expansion structure includes an inner expansion tube 7 concentrically inserted into the convex edge 5, and a plurality of expansion seams 6 opened at the upper end of the convex edge 5. The expansion seams 6 are evenly distributed along the circumferential direction of the convex edge and the number is 4-6. The inner expansion tube 7 includes a conical section 7a and a threaded section 7b arranged in sequence from top to bottom. The inner wall of the convex edge 5 and the conical section 7a are matched by a conical surface, and the outer diameter of the conical section 7a gradually increases from top to bottom; the inner wall of the lower section of the inner through hole 9 and the threaded section 7b are connected by a threaded match. In this structure, the convex edge 5 has a certain elastic deformation space due to the existence of the expansion seam 6. By relying on the taper match between the conical section 7a and the convex edge 5, when the inner expansion tube 7 moves upward, each part of the convex edge 5 can be expanded outward and in expansion contact with the inner wall of the hollow section 1c at the lower end of the carrier 1. Among them, the inner expansion tube 7 is pushed up and down by the thread between the threaded section 7b and the lower section of the inner through hole 9. The adjustment can be driven by rotating the threaded section 7b.

[0029] Reference Figure 5 In order to facilitate the adjustment of the position of the inner expansion tube 7, a hand-held portion is provided on the lower end surface of the inner expansion tube 7 in this embodiment, and the hand-held portion includes at least one spoke 8 that passes through the center of the circle and has two ends connected to the inner wall of the inner expansion tube 7. During use, the inner expansion tube 7 can be easily rotated by simply holding the spoke 8 and inserting it from the lower end.

[0030] In this embodiment, a friction pattern (not shown) is provided on the outer wall of the convex edge 5. The friction pattern is designed to increase the friction force between the contact surface of the convex edge 5 and the hollow section 1c of the carrier 1, thereby improving the stability of the expansion fit between the two.

[0031] The present embodiment can fully meet the requirements of clamping and testing small-diameter metal carriers on the flow table without changing the flow table, and has a variety of positioning methods such as the bottom support of the inner through hole 9 positioning step surface 3, the outer circumferential sealing extrusion positioning of multiple sealing rings and the internal expansion positioning of the elastic expansion structure, which significantly improves the installation and positioning stability of the carrier 1. The installation is stable, not easy to shake and has good sealing performance, which effectively ensures the accuracy of the data during the flow back pressure test.

[0032] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention are still covered by the claims of the present invention.

Claims

1. A metal carrier backpressure test tool for auxiliary exhaust gas purification, the carrier comprising a housing and a core, and both ends of the housing being longer than the core to form a hollow section, characterized in that: The back pressure test fixture comprises a truncated cone body with an outer diameter that is smaller at the top and larger at the bottom and an inner through hole, wherein a positioning step surface is provided in the inner through hole to divide the inner through hole into two sections with a larger upper section and a smaller lower section, wherein the carrier is inserted into the upper section of the inner through hole and the lower end of the carrier is abutted against the positioning step surface; wherein the inner wall of the upper section of the inner through hole is provided with at least two annular grooves, wherein an annular sealing ring is embedded in the annular groove, and the outer peripheral wall of the carrier is tightly fitted with the inner wall of the annular sealing ring; The positioning step surface also extends upward to form an annular convex edge, and a tightening structure is provided on the convex edge. The convex edge is inserted into the hollow section at the lower end of the carrier and is tightened with the inner wall of the hollow section through the tightening structure.

2. The metal carrier backpressure test tool for auxiliary tail gas purification according to claim 1, wherein: The expansion structure includes an inner expansion tube concentrically inserted into the flange and a plurality of expansion seams opened at the upper end of the flange. The inner expansion tube includes a conical section and a threaded section arranged in sequence from top to bottom. The inner wall of the flange and the conical section are matched by a conical surface, and the inner wall of the lower section of the inner through hole and the threaded section are connected by a threaded fit.

3. The metal carrier backpressure test tooling for auxiliary tail gas purification according to claim 2, wherein: The outer diameter of the tapered section increases gradually from top to bottom.

4. The metal carrier backpressure test tooling for auxiliary tail gas purification according to claim 2, characterized in that: A hand-holding portion is provided on the lower end surface of the inner expansion cylinder. The hand-holding portion includes at least one spoke which passes through the center of the circle and has two ends connected to the inner wall of the inner expansion cylinder.

5. The metal carrier backpressure test tooling for auxiliary tail gas purification according to claim 2, wherein: The expansion seams are evenly distributed along the circumferential direction of the convex edge and the number thereof is 4-6.

6. The metal carrier backpressure test tooling for auxiliary tail gas purification according to claim 1, characterized in that: The outer wall of the convex edge is provided with friction lines.

7. The metal carrier backpressure test tooling for auxiliary tail gas purification according to claim 1, wherein: The annular sealing ring is made of rubber and its inner diameter is 1-2 mm smaller than the outer diameter of the carrier.

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