OPF differential pressure pipe gas tightness testing device

Abstract

The utility model discloses a kind of OPF differential pressure pipe air-tightness testing device, including base, second L-shaped plate, linear slide rail;First L-shaped plate, first support block, second support block, third L-shaped plate are sequentially fixed and installed on base from left to right, second L-shaped plate is slidably installed on linear slide rail;First support block, second support block top has locating recess.This test device places the cylindrical pipe of OPF differential pressure pipe ceramic filter shell both ends in the locating recess of first support block, second support block, starts telescopic air cylinder, and two ends of cylindrical pipe can be fixed and compacted sealing by first pressure plate and second pressure plate, with the advantage that clamping speed is fast.Set with first spring, second spring can avoid telescopic air cylinder piston rod to extend excess, cause both ends of cylindrical pipe or first rubber pad, second rubber pad are damaged by excess extrusion, pressure inlet is arranged on second rubber pad, and pipeline arrangement can be simplified.

Description

Technical Field

[0001] This utility model belongs to the field of OPF differential pressure tube technology, and in particular relates to an OPF differential pressure tube airtightness testing device. Background Technology

[0002] The OPF differential pressure line is used to capture fine particulate matter (PM / PN) produced by engine combustion to meet the stringent China VI emission standards. It measures the pressure difference between the front and rear gas pressure filter (GPF) and the OPF to monitor the operating status, especially the degree of blockage. By measuring this critical pressure difference, the system ensures proper functioning of the emission system, guaranteeing vehicle compliance with environmental regulations while protecting the engine from damage. Therefore, the airtightness of the OPF differential pressure line welds is pressure-tested at the factory to ensure product quality. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a device for pressurizing and sealing the two ends of the ceramic filter housing of the OPF differential pressure tube for pressure testing.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: an OPF differential pressure tube airtightness testing device, comprising a base, a second L-shaped plate, and a linear slide rail;

[0005] The first L-shaped plate, the first support block, the second support block, and the third L-shaped plate are fixedly installed on the base from left to right. The linear slide rail is fixedly installed on the base, and the second L-shaped plate is slidably installed on the linear slide rail.

[0006] A telescopic cylinder is fixedly installed on the first L-shaped plate, and the piston rod of the telescopic cylinder is fixedly connected to the second L-shaped plate.

[0007] A first central shaft and a first guide rod are fixedly installed on the right end of the first pressure plate. The first central shaft and the first guide rod are slidably installed inside the second L-shaped plate. A first spring is sleeved on the first guide rod. The two ends of the first spring act on the first pressure plate and the second L-shaped plate respectively. A first stop sleeve acting on the right end face of the second L-shaped plate is fixedly sleeved on the first central shaft. A first rubber pad is fixedly installed inside the first pressure plate.

[0008] A second central shaft and a second guide rod are fixedly installed on the left end of the second pressure plate. The second central shaft and the second guide rod are slidably installed inside the third L-shaped plate. A second spring is sleeved on the second guide rod. The two ends of the second spring act on the second pressure plate and the third L-shaped plate, respectively. A second stop sleeve acting on the left end face of the third L-shaped plate is fixedly sleeved on the second central shaft. A pneumatic connector is fixedly installed on the second pressure plate. A second rubber pad is fixedly installed inside the second pressure plate. The second rubber pad has a through hole in the middle that communicates with the pneumatic connector.

[0009] The tops of the first and second support blocks have positioning notches.

[0010] Preferably, the first guide rod and the second guide rod are both rectangular and there are four of them.

[0011] Preferably, the top of the first support block and the second support block has a positioning notch in the shape of a V-shape.

[0012] Preferably, both the first pressure plate and the second pressure plate consist of a fixed plate and a clamping ring. The clamping ring is screwed and fixedly installed on the fixed plate, and the first rubber pad and the second rubber pad are clamped and fixed between the clamping ring and the fixed plate.

[0013] Compared with the prior art, the advantages of this utility model are as follows: This testing device places the cylindrical tubes at both ends of the OPF differential pressure tube ceramic filter housing into the positioning recesses of the first and second support blocks. Activating the telescopic cylinder, through the first and second pressure plates, can fix and press the cylindrical tubes at both ends to a seal, offering the advantage of fast clamping speed. The inclusion of a first and second spring prevents the piston rod of the telescopic cylinder from extending excessively, which could cause excessive compression and damage to the cylindrical tubes at both ends or the first and second rubber pads. The pressure inlet is located on the second rubber pad, simplifying the pipeline layout. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a perspective view of the present invention.

[0016] Figure 2 This is a top view of the present invention. Detailed Implementation

[0017] The present invention will now be described in detail with reference to specific embodiments:

[0018] like Figure 1 and Figure 2 The OPF differential pressure tube air tightness testing device shown includes a base 1, a second L-shaped plate 3, and a linear slide rail 5;

[0019] The first L-shaped plate 2, the first support block 8, the second support block 9, and the third L-shaped plate 4 are fixedly installed on the base 1 from left to right. The linear slide rail 5 is fixedly installed on the base 1, and the second L-shaped plate 3 is slidably installed on the linear slide rail 5.

[0020] A telescopic cylinder 21 is fixedly installed on the first L-shaped plate 2, and the piston rod of the telescopic cylinder 21 is fixedly connected to the second L-shaped plate 3.

[0021] A first central shaft 64 and a first guide rod 62 are fixedly installed on the right end of the first pressure plate 6. The first central shaft 64 and the first guide rod 62 are slidably installed inside the second L-shaped plate 3. A first spring 63 is sleeved on the first guide rod 62. The two ends of the first spring 63 act on the first pressure plate 6 and the second L-shaped plate 3 respectively. A first stop sleeve acting on the right end face of the second L-shaped plate 3 is fixedly sleeved on the first central shaft 64. A first rubber pad 61 is fixedly installed inside the first pressure plate 6.

[0022] The second pressure plate 7 has a second central shaft 74 and a second guide rod 72 fixedly installed on the left end. The second central shaft 74 and the second guide rod 72 are slidably installed in the third L-shaped plate 4. A second spring 73 is sleeved on the second guide rod 72. The two ends of the second spring 73 act on the second pressure plate 7 and the third L-shaped plate 4 respectively. A second stop sleeve 75 acting on the left end face of the third L-shaped plate 4 is fixedly sleeved on the second central shaft 74. A pneumatic connector 71 is fixedly installed on the second pressure plate 7. A second rubber pad is fixedly installed inside the second pressure plate 7. The second rubber pad has a through hole in the middle that communicates with the pneumatic connector 71.

[0023] The tops of the first support block 8 and the second support block 9 have positioning notches.

[0024] The first guide rod 62 and the second guide rod 72 are both rectangular and there are four of them. The second L-shaped plate 3 and the third L-shaped plate 4 are fixedly installed with guide sleeves. The first guide rod 62 and the second guide rod 72 are slidably installed in the guide sleeves to improve the axial straightness of the first pressure plate 6 and the second pressure plate 7.

[0025] The top of the first support block 8 and the second support block 9 has a positioning notch with a V-shaped structure. The V-shaped structure has the advantages of stable placement and fast positioning speed.

[0026] Both the first pressure plate 6 and the second pressure plate 7 consist of a fixed plate and a clamping ring. The clamping ring is screwed and fixedly installed on the fixed plate. The first rubber pad 61 and the second rubber pad are clamped and fixed between the clamping ring and the fixed plate, making it easy to disassemble and replace them individually after the first rubber pad 61 and the second rubber pad are damaged.

[0027] The cylindrical tubes at both ends of the OPF differential pressure tube ceramic filter housing are placed in the positioning recesses of the first support block 8 and the second support block 9. The piston rod of the telescopic cylinder 21 extends and pushes the second L-shaped plate 3 to slide to the left along the linear slide rail 5. The cylindrical tubes at both ends are sealed and pressed and fixed by the cooperation of the first rubber pad 61 on the first pressure plate 6 and the second rubber pad on the second pressure plate 7. The cylindrical tube at the left end is connected to the air pressure connector 71 through the through hole at the center of the second rubber pad. The air pressure connector 71 is connected to the inflation device through the pipeline. The inflation device introduces air pressure into the OPF differential pressure tube ceramic filter housing and the cylindrical tube and maintains the pressure for a certain period of time. The change in the value of the air pressure sensor on the inflation device is observed to determine the air tightness of the OPF differential pressure tube ceramic filter housing and the cylindrical tube.

Claims

1. An OPF differential pressure tube airtightness testing device, characterized in that: Includes base (1), second L-shaped plate (3), and linear slide rail (5); The first L-shaped plate (2), the first support block (8), the second support block (9), and the third L-shaped plate (4) are fixedly installed on the base (1) from left to right. The linear slide rail (5) is fixedly installed on the base (1), and the second L-shaped plate (3) is slidably installed on the linear slide rail (5). A telescopic cylinder (21) is fixedly installed on the first L-shaped plate (2), and the piston rod of the telescopic cylinder (21) is fixedly connected to the second L-shaped plate (3); The first pressure plate (6) has a first central shaft (64) and a first guide rod (62) fixedly installed on the right end. The first central shaft (64) and the first guide rod (62) are slidably installed in the second L-shaped plate (3). A first spring (63) is sleeved on the first guide rod (62). The two ends of the first spring (63) act on the first pressure plate (6) and the second L-shaped plate (3) respectively. A first stop sleeve acting on the right end face of the second L-shaped plate (3) is fixedly sleeved on the first central shaft (64). A first rubber pad (61) is fixedly installed inside the first pressure plate (6). The second pressure plate (7) has a second central shaft (74) and a second guide rod (72) fixedly installed on the left end. The second central shaft (74) and the second guide rod (72) are slidably installed in the third L-shaped plate (4). A second spring (73) is sleeved on the second guide rod (72). The two ends of the second spring (73) act on the second pressure plate (7) and the third L-shaped plate (4) respectively. A second stop sleeve (75) acting on the left end face of the third L-shaped plate (4) is fixedly sleeved on the second central shaft (74). A pneumatic connector (71) is fixedly installed on the second pressure plate (7). A second rubber pad is fixedly installed inside the second pressure plate (7). The second rubber pad has a through hole in the middle that communicates with the pneumatic connector (71). The top of the first support block (8) and the second support block (9) has a positioning notch.

2. The OPF differential pressure tube airtightness testing device according to claim 1, characterized in that: The first guide rod (62) and the second guide rod (72) are both rectangular and are provided in fours.

3. The OPF differential pressure tube airtightness testing device according to claim 1, characterized in that: The top of the first support block (8) and the second support block (9) has a positioning notch with a V-shaped structure.

4. The OPF differential pressure tube airtightness testing device according to claim 1, characterized in that: Both the first pressure plate (6) and the second pressure plate (7) consist of a fixed plate and a clamping ring. The clamping ring is screwed and fixedly installed on the fixed plate. The first rubber pad (61) and the second rubber pad are clamped and fixed between the clamping ring and the fixed plate.

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