EGR cooler airtightness testing device

Abstract

The EGR cooler airtightness testing device comprises a testing box, a sealing cover plate is attached to an opening of the top face of the testing box, and tempered glass is embedded in the surface of the front end of the testing box. The test box has the beneficial effects that the cigarette exhaust nozzle and the cigarette inlet nozzle of the test box are respectively sleeved with a sealing sheath, the port of the cigarette exhaust nozzle and the port of the cigarette inlet nozzle are respectively sleeved with a sealing rubber ring, and the EGR cooler is arranged between the cigarette exhaust nozzle and the cigarette inlet nozzle, so that the cigarette exhaust nozzle and the cigarette inlet nozzle respectively extend into an inlet and an outlet of the EGR cooler; the sealing sheath is arranged on the inner side face of the inlet and the outlet of the EGR cooler and abuts against the inner side face of the inlet and the outlet of the EGR cooler through the sealing rubber ring, then the strapping tape arranged at the end opening of the sealing sheath is pulled, the end opening, arranged on the periphery of the inlet and the outlet of the EGR cooler in a sleeving mode, of the sealing sheath is tightened, and the inlet and the outlet of the EGR cooler are sealed after the strapping tape is knotted. And the sealing performance of the EGR cooler in the air tightness test stage is maintained by adopting the modes of sleeving, bundling and sealing rubber ring connection.

Description

TECHNICAL FIELD

[0001] The utility model relates to a cooler test technical field, concretely relates to an EGR cooler air tightness testing arrangement. BACKGROUND

[0002] EGR is the abbreviation of exhaust gas recirculation system, the system reduces the temperature in the combustion chamber through the small amount of combustion exhaust gas into the intake pipeline, reduces the nitrogen oxide content in the tail gas. However, the exhaust gas temperature discharged from the cylinder is very high, so a cooler needs to be connected in the EGR pipeline and cooling liquid is introduced to reduce the exhaust gas temperature reaching the intake pipeline, the EGR cooler needs to be tested for air tightness after production, so an air tightness testing arrangement needs to be used to test the air tightness of the EGR cooler during testing.

[0003] In the prior art, for the air tightness test of the EGR cooler, the traditional air tightness test equipment usually uses a sealing cover to simply seal the inlet and outlet of the cooler. Since the EGR cooler cannot be stably sealed at the inlet and outlet during the test stage, the sealing performance of the cooler cannot be guaranteed during repeated use, and errors in air tightness testing are likely to occur. UTILITY MODEL CONTENTS

[0004] (I) Technical problem solved

[0005] In view of the deficiencies in the prior art, the utility model provides an EGR cooler air tightness testing arrangement, which has the advantages of good sealing effect and reduced test errors, thereby solving the problems in the above background technology.

[0006] (II) Technical scheme

[0007] In order to realize the advantages of good sealing effect and reduce test error, the specific technical scheme of the utility model is as follows: a kind of EGR cooler air tightness testing device, including test box, the opening of the top surface of test box is attached with sealing cover plate, and tempered glass is embedded and installed at the front end surface of test box, the left side wall of test box is fixed with smoke box, and the side of smoke box facing test box is communicated with smoke inlet nozzle, and the smoke inlet nozzle of smoke box extends to the inside of test box, the right side wall of test box is installed with smoke outlet nozzle, and one sealing rubber ring is respectively installed in the opposite end of smoke outlet nozzle and smoke inlet nozzle, one sealing sheath is respectively installed in the periphery of smoke outlet nozzle and smoke inlet nozzle, one end of sealing sheath is sealingly connected with the inner wall of test box, the other end of sealing sheath is stitched with binding belt, and the both ends of binding belt extend to the outside of sealing sheath, the lower surface of test box is welded with mounting seat, and the top surface of mounting seat is fixed with blower, the air outlet of blower is connected with smoke box by pipeline, the outer surface of test box is installed with controller and buzzer, and the inner wall of test box is provided with smoke sensor electrically connected with controller, and the output end of controller is electrically connected with buzzer.

[0008] Further, the top surface of the smoke box is communicated with a fuel adding nozzle, and a sealing cover is installed on the port of the fuel adding nozzle.

[0009] Further, the top surface of the test box is welded with two sliding rails with U-shaped structure, and the two sliding rails are distributed on the left and right sides of the opening of the test box.

[0010] Further, the ports of the smoke outlet nozzle and the smoke inlet nozzle are provided with annular protrusions, and the inner ring of the sealing rubber ring is provided with an annular groove corresponding to the annular protrusion.

[0011] Further, two support members are symmetrically welded on the inside bottom of the test box, and the top of each support member is provided with a circular-arc-shaped groove.

[0012] Further, the smoke box has an overall L-shaped structure, and a filter screen is installed at the corner inside the smoke box.

[0013] (Three) beneficial effects

[0014] Compared with the prior art, the utility model provides an EGR cooler air tightness testing device, which has the following beneficial effects:

[0015] (1), the utility model discloses a set up a sealing sheath on the exhaust nozzle and the smoke inlet nozzle of test box respectively, and set up a sealing rubber ring on the port of exhaust nozzle and smoke inlet nozzle respectively, by placing EGR cooler between exhaust nozzle and smoke inlet nozzle, make exhaust nozzle and smoke inlet nozzle respectively into EGR cooler import and export, and make it with the inside of EGR cooler import and export by sealing rubber ring, then draw the bundling tape of sealing sheath port, make the sealing sheath port of EGR cooler import and export periphery be tightened, and seal EGR cooler import and export after the knot of bundling tape, adopt the mode of sleeve connection, bundling and sealing rubber ring connection and maintain the sealing property of EGR cooler airtightness test stage, thereby advantageously reduce the error of airtightness detection result.

[0016] (2), the utility model discloses the work of starting the blower on the mounting seat, make the blower introduce the air into the smoke box, make the SD-B type smoke dye of combustion in the smoke box pass into the EGR cooler to be tested in the form of colored smoke through the smoke inlet nozzle, if EGR cooler shell exists flaw, then colored smoke can leak through the gap of EGR cooler shell, and the airtightness defect position of EGR cooler shell can be observed through the toughened glass, on the basis, the smoke sensor arranged in the test box can detect the smoke concentration data in the test box in real time, when the smoke concentration is greater than the controller preset value, then the controller starts the buzzer alarm, realize the effect of EGR cooler airtightness defect alarm, adopt this mode, have the advantage of improving EGR cooler airtightness test efficiency and convenience. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Fig. 1 is a structure diagram of an EGR cooler airtightness testing device according to the embodiments of the present application;

[0019] Fig. 2 is a schematic diagram of the internal structure of the test box;

[0020] Fig. 3 is an installation diagram of the EGR cooler airtightness testing stage.

[0021] In the drawings:

[0022] 1, test box; 2, slide rail; 3, sealing cover plate; 4, tempered glass; 5, mounting seat; 6, air blower; 7, smoke box; 8, fuel feeding nozzle; 9, smoke exhaust nozzle; 10, controller; 11, buzzer; 12, smoke inlet nozzle; 13, sealing sleeve; 14, smoke sensor; 15, bundling belt; 16, baffle; 17, sealing rubber ring; 18, support. DETAILED DESCRIPTION

[0023] To further illustrate the embodiments, the utility model provides the drawings, these drawings are the part of the utility model disclosure, it mainly used to illustrate the embodiment, and can cooperate the relevant description of the specification to explain the operation principle of the embodiment, cooperate with reference to these contents, the person skilled in the art should be able to understand other possible implementation ways and the advantages of the utility model, the components in the drawing are not drawn according to scale, and similar component symbols are usually used to indicate similar components.

[0024] According to the embodiment of the utility model, an EGR cooler airtightness testing device is provided.

[0025] The utility model will be further illustrated by combining with the specific embodiment and the drawing, such as Figs. 1-3As shown, according to the utility model embodiment of a kind of EGR cooler air tightness testing device, including test box 1, the opening of test box 1 top surface is attached with sealing cover plate 3, and tempered glass 4 is embedded and installed in the front end surface of test box 1, test box 1 left side wall is fixed with smoke box 7, and the side of smoke box 7 facing test box 1 is communicated with smoke inlet nozzle 12, and the smoke inlet nozzle 12 of smoke box 7 extends to test box 1 inside, and smoke outlet nozzle 9 is inserted and installed in the right side wall of test box 1, and one sealing rubber ring 17 is respectively installed in the opposite end of smoke inlet nozzle 12 and smoke outlet nozzle 9, one sealing sleeve 13 is respectively installed in the periphery of smoke inlet nozzle 12 and smoke outlet nozzle 9, and one end of sealing sleeve 13 is sealingly connected with the inner wall surface of test box 1, and the other end of sealing sleeve 13 is stitched and installed with binding tape 15, and the two ends of binding tape 15 respectively extend to the outside of sealing sleeve 13, mounting seat 5 is welded on the lower surface of test box 1, and blower 6 is fixed on the top surface of mounting seat 5, and the outlet of blower 6 is communicated with smoke box 7 by pipeline, controller 10 and buzzer 11 are installed on the outer surface of test box 1, and smoke sensor 14 electrically connected with controller 10 is arranged on the inner wall surface of test box 1, the output end of controller 10 is electrically connected with buzzer 11, the controller 10 is general controller 10 in market, which can be single-chip microcomputer processor, PLC processor or MCU processor, the control circuit of controller 10 can be realized by simple programming of the skilled in the art, and the provision of power is also known in the art, and the utility model is mainly used for protecting mechanical device, so the control mode and circuit connection are not explained in detail, in order to further improve the air tightness of EGR cooler test stage, binding tape 15 can be wound on the outer surface of sealing sleeve 13, and then knotted, sealing sleeve 13 is stitched by inner lining and leather layer on its outer surface, and sealing sleeve 13 is in whole cylindrical structure.

[0026] In one embodiment, the top surface of smoke box 7 is communicated with fuel adding nozzle 8, and a sealing cover is installed on the port of fuel adding nozzle 8, two baffles 16 are welded in the inside of smoke box 7, and SD-B type smoke dye combustion cavity is formed between the two baffles 16, by using this structure, it is easy to form colored smoke by SD-B type smoke dye combustion, SD-B type smoke dye has the advantages of low price, non-toxic and no pollution, suitable for air tightness test, convenient for observing air tightness defect position.

[0027] In one embodiment, the top surface of the test box 1 is welded with two U-shaped slide rails 2, and the two slide rails 2 are distributed on the left and right sides of the opening of the test box 1. The left and right sides of the sealing cover plate 3 are respectively welded with slide strips in sliding connection with the slide rails 2, and the bottom surface of the sealing cover plate 3 is pasted with a rubber sealing gasket. The use of the slide rails 2 facilitates the sliding of the sealing cover plate 3 and the feeding and discharging of the EGR cooler. The sealing cover plate 3 with the rubber sealing gasket is beneficial to increasing the sealing performance of the test box 1 during the test.

[0028] In one embodiment, the ports of the smoke exhaust nozzle 9 and the smoke inlet nozzle 12 are provided with annular protrusions, and the inner ring of the sealing rubber ring is provided with annular grooves corresponding to the annular protrusions. The use of the annular protrusions and the annular grooves makes the sealing rubber ring reliable to install and not easy to fall off.

[0029] In one embodiment, the inside bottom of the test box 1 is symmetrically welded with two support pieces 18, and the top of each of the two support pieces 18 is provided with a circular-arc-shaped groove. The two support pieces 18 and the circular-arc-shaped grooves on the top of the two support pieces 18 provide support for the EGR cooler.

[0030] In one embodiment, the smoke box 7 has an overall L-shaped structure, and a filter screen is installed at the corner inside the smoke box 7. The use of the filter screen can block large-particle impurities that may be generated in the SD-B type smoke dye combustion, so as to prevent the large-particle impurities from entering the inside of the EGR cooler.

[0031] Working principle: first slide the sealing cover plate 3, so that the opening of the test box 1 top surface is exposed, then the EGR cooler to be tested is placed in the test box 1, when the EGR cooler is fixed, by placing the EGR cooler between the exhaust gas nozzle 9 and the smoke inlet nozzle 12, the exhaust gas nozzle 9 and the smoke inlet nozzle 12 are respectively inserted into the EGR cooler inlet and outlet, and the inner side of the EGR cooler inlet and outlet is abutted by the sealing rubber ring 17, then the bundling belt 15 arranged at the port of the sealing sleeve 13 is pulled, so that the port of the sealing sleeve 13 sleeved on the periphery of the EGR cooler inlet and outlet is tightened, and after the bundling belt 15 is knotted, the EGR cooler inlet and outlet are sealed, other branch ports of the EGR cooler are sealed by inserting the rubber plug, by starting the air blower 6 on the mounting seat 5, the air blower 6 introduces air into the smoke box 7, so that the SD-B type smoke dye burned in the smoke box 7 is introduced into the EGR cooler to be tested in the form of colored smoke through the smoke inlet nozzle 12, if the EGR cooler shell has defects, the colored smoke can leak through the gap of the EGR cooler shell, and the air tightness defect position of the EGR cooler shell can be observed through the tempered glass 4, on this basis, the smoke sensor 14 arranged in the test box 1 can detect the smoke concentration data in the test box 1 in real time, when the smoke concentration is greater than the preset value of the controller 10, the controller 10 starts the buzzer 11 to alarm, realizing the air tightness defect alarm effect of the EGR cooler.

[0032] In the utility model, unless another definite provision and limitation, the terms "mount", "arrange", "connect", "fix", "screw" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication of two element interiors or the interaction of two elements, unless another definite limitation, for the ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model in the specific situation.

[0033] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An EGR cooler air tightness testing device comprising a test box (1), characterized in that, The opening of the top surface of the test box (1) is attached with a sealing cover plate (3), and the front end surface of the test box (1) is embedded with a tempered glass (4), the left side wall of the test box (1) is fixed with a smoke box (7), and the side of the smoke box (7) facing the test box (1) is communicated with a smoke inlet nozzle (12), and the smoke inlet nozzle (12) of the smoke box (7) extends to the inside of the test box (1), the right side wall of the test box (1) is inserted with a smoke exhaust nozzle (9), and the opposite ends of the smoke exhaust nozzle (9) and the smoke inlet nozzle (12) are respectively sleeved with a sealing rubber ring (17), the periphery of the smoke exhaust nozzle (9) and the smoke inlet nozzle (12) is respectively sleeved with a sealing sleeve (13), one end of the sealing sleeve (13) is sealingly connected with the inner wall surface of the test box (1), the other end of the sealing sleeve (13) is sewn with a binding belt (15), and the two ends of the binding belt (15) extend to the outside of the sealing sleeve (13), the lower surface of the test box (1) is welded with a mounting seat (5), the top surface of the mounting seat (5) is fixed with a blower (6), the air outlet of the blower (6) is communicated with the smoke box (7) through a pipeline, the controller (10) and the buzzer (11) are installed on the outer surface of the test box (1), and the smoke sensor (14) electrically connected with the controller (10) is arranged on the inner wall surface of the test box (1), the output end of the controller (10) is electrically connected with the buzzer (11).

2. The EGR cooler air tightness testing device of claim 1, wherein, The top surface of the smoke box (7) is communicated with a fuel adding nozzle (8), and the port of the fuel adding nozzle (8) is sleeved with a sealing cover, the inside of the smoke box (7) is welded with two baffles (16), and the SD-B type smoke dye combustion cavity is formed between the two baffles (16).

3. The EGR cooler air tightness testing device of claim 1, wherein, The top surface of the test box (1) is welded with two U-shaped slide rails (2), and the two slide rails (2) are distributed on the left and right sides of the opening of the test box (1), the left and right sides of the sealing cover plate (3) are respectively welded with a slide bar connected with the slide rail (2), and the bottom surface of the sealing cover plate (3) is pasted with a rubber sealing gasket.

4. The EGR cooler air tightness testing device of claim 1, wherein, The port of the smoke exhaust nozzle (9) and the smoke inlet nozzle (12) is provided with an annular protrusion, and the inner ring of the sealing rubber ring is provided with an annular groove corresponding to the annular protrusion.

5. The EGR cooler air tightness testing device of claim 1, wherein, The bottom of the test box (1) is symmetrically welded with two support pieces (18), and the top of each of the two support pieces (18) is provided with a circular arc groove.

6. The EGR cooler air tightness testing device of claim 1, wherein, The smoke box (7) is in L-shaped structure, and a filter screen is installed at the corner of the inside of the smoke box (7).

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