Air removal structure of automobile exhaust detection device

Abstract

The utility model relates to the technical field of automobile exhaust detection, in particular to an air exhaust structure of an automobile exhaust detection device, which comprises at least two collecting boxes and connecting pipes arranged on the collecting boxes, one-way valves are connected onto the collecting boxes through transition pipes, hoses are connected onto the connecting pipes, and connectors are mounted at the ends of the hoses. Before use, the driving assembly drives the piston to move, impurities attached to the inner wall of the collecting box are scraped off by the outer edge of the piston, the situation that follow-up measurement results are affected due to the fact that accumulated impurities are attached to the inner wall of the collecting box is avoided, the sealing cover is installed during use, and for residual air in the collecting box, the air cylinder drives the piston to continue to slide in the collecting box, so that the follow-up measurement results are not affected. Tail gas and residual air in the gas collection cavity are discharged through the transition pipe and the one-way valve, and finally, a certain negative pressure environment is formed in the gas collection cavity under the action of the sucking pump, so that the tail gas preferentially flows into the gas collection cavity and is not easy to mix with external air, and the accuracy of a measurement result can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to automobile exhaust detection technical field especially, relate to an air exhaust structure of automobile exhaust detection device. BACKGROUND

[0002] In the process of detecting automobile exhaust, air needs to be excluded, and it is very important to ensure that the air in the test environment is excluded as much as possible, because the mixing of external air may affect the measurement result, in order to ensure the authenticity and representativeness of the exhaust sample, most of the prior art is realized by the way of fan cooperating with check valve.

[0003] For example, the Chinese patent with the application number CN 202223091018.6 discloses a collection device for exhaust detection, which comprises a collection box, a protection box is fixedly connected to one side of the upper end of the collection box, a fan is arranged in the protection box, a check valve is arranged at the lower end of the fan, a threaded sleeve is threadedly connected to the upper end of the collection box, and a connecting plate is connected to the side, away from the protection box, of the upper end of the collection box through a plurality of second screws, which extracts the air in the collection cavity through the fan, extracts the exhaust into the collection box, and the gas in the collection cavity can be discharged through the check valve arranged at the lower end of the fan. However, automobile exhaust contains a large number of large-particle impurities, and after the exhaust is extracted into the collection box, although the fan cooperating with the check valve can discharge the gas in the collection cavity, part of the accumulated impurities will still adhere to the inner wall of the collection box, affecting the accuracy of the next measurement result. SUMMARY

[0004] Therefore, the utility model aims at providing an air exhaust structure of automobile exhaust detection device to solve the technical problem that after the exhaust is extracted into the collection box, although the fan cooperating with the check valve can discharge the gas in the collection cavity, part of the accumulated impurities will still adhere to the inner wall of the collection box, affecting the accuracy of the next measurement result.

[0005] In order to achieve the above purpose, the utility model provides an air exhaust structure of automobile exhaust detection device, which comprises a collection box and a connecting pipe arranged on the collection box, a check valve is connected to the collection box through a transition pipe, a hose is connected to the connecting pipe, an interface is installed at the end of the hose, the collection box has at least two, and the air exhaust structure further comprises:

[0006] A mounting base is fixedly provided with a hanging bracket, and the two collection boxes are installed on the two sides of the hanging bracket through a closure cover;

[0007] A piston is slidably arranged in the collection box;

[0008] A driving assembly is arranged for driving the piston to slide.

[0009] Further, the driving assembly comprises:

[0010] a cylinder mounted on the mounting base;

[0011] a connecting head mounted on the piston, and the output end of the cylinder penetrates the collecting box and is connected with the connecting head.

[0012] Further, the collecting box is a gas collecting cavity between the piston and the closing cover.

[0013] Further, the output end of the cylinder is connected with the gas collecting cavity in the fully retracted state.

[0014] Further, the output end of the cylinder is connected with the closing cover in the fully extended state.

[0015] Further, the transition pipe is detachably mounted on the closing cover through a fastening bolt.

[0016] Further, the other end of the transition pipe penetrates the hanger and the mounting base and is provided with an air exhaust pump, and the one-way valve is mounted on the air exhaust pump.

[0017] Further, the output end of one of the cylinders is in the extended state, and the output end of the other cylinder is in the retracted state.

[0018] The beneficial effects of the utility model are as follows: the air exhaust structure of the automobile exhaust detection device of the utility model is used, the piston is driven to move by the driving assembly before use, the impurities attached to the inner wall of the collecting box are scraped off by the outer edge of the piston, the subsequent measurement result is not affected by the accumulated impurities attached to the inner wall of the collecting box, the closing cover is installed during use, the residual air in the collecting box is driven by the cylinder to continue to slide in the collecting box, the exhaust gas and the residual air in the gas collecting cavity are discharged through the transition pipe and the one-way valve, finally, a certain negative pressure environment is formed in the gas collecting cavity under the action of the air exhaust pump, the exhaust gas is preferentially flowed into the gas collecting cavity and is not easily mixed with the external air, and the accuracy of the measurement result can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only the utility model, and other drawings can be obtained by the ordinary skilled in the art without creative labor on the basis of the drawings.

[0020] Figure 1 It is a structural schematic view of the utility model.

[0021] Figure 2 It is the structure schematic view of the mounting base in the utility model;

[0022] Figure 3 It is the assembly schematic view of the collecting box and the driving assembly in the utility model.

[0023] Marked as in the figure:

[0024] 1, collecting box;2, connecting pipe;3, transition pipe;4, check valve;5, hose;6, interface;7, mounting base;8, hanger;9, closure cover;10, piston;11, air cylinder;12, connector;13, gas collecting cavity;14, fastening bolt;15, air suction pump. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in combination with specific embodiment, and the utility model is further detailed.

[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the utility model should be the usual meaning understood by the person skilled in the art to which the utility model belongs.The "first", "second" and similar words used in the utility model do not represent any order, quantity or importance, but are only used to distinguish different components."Include" or "contain" and similar words mean that the element or object before the word covers the element or object listed after the word and its equivalent, and does not exclude other elements or objects."Connection" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect."Up", "down", "left", "right" and the like are only used to represent the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] The first aspect of the utility model proposes an air exhaust structure of a vehicle exhaust detection device, as shown in Figures 1-3 The air exhaust structure comprises a collecting box 1 and a connecting pipe 2 arranged on the collecting box 1, a check valve 4 is connected to the collecting box 1 through a transition pipe 3, a hose 5 is connected to the connecting pipe 2, an interface 6 is installed at the end of the hose 5, the collecting box 1 is at least two, and the air exhaust structure further comprises:

[0028] A mounting base 7, the mounting base 7 is fixed with a hanger 8, and the two collecting boxes 1 are installed on both sides of the hanger 8 through a closure cover 9;

[0029] A piston 10, the piston 10 is slidingly arranged in the collecting box 1;

[0030] A driving assembly for driving the piston 10 to slide.

[0031] In this embodiment, the driving assembly comprises:

[0032] A cylinder 11, which is mounted on the mounting base 7;

[0033] A connecting head 12, which is mounted on the piston 10, and the output end of the cylinder 11 penetrates the collecting box 1 and is connected with the connecting head 12.

[0034] In this embodiment, the collecting box 1 is provided with a collecting cavity 13 between the piston 10 and the closure cover 9, and the collecting cavity 13 can collect the exhaust sample to be detected, and the sample taking process only needs to remove the interface 6 connected with the exhaust emission port of the automobile, so as to connect the input port of the detection part.

[0035] In this embodiment, the output end of the cylinder 11 is connected with the collecting cavity 13 in the fully retracted state, and the piston 10 is attached to the closure cover 9 in the fully extended state.

[0036] In this embodiment, the other end of the transition pipe 3 penetrates the hanger 8 and the mounting base 7 and is provided with an air suction pump 15, and the one-way valve 4 is mounted on the air suction pump 15.

[0037] Working process and principle: in use, the closure cover 9 mounted on the collecting box 1 is first removed, and the two cylinders 11 are started respectively, so that the output ends of the two cylinders 11 drive the piston 10 to reciprocate in the collecting box 1, and after the impurities attached to the inner wall of the collecting box 1 are scraped off by the outer edge of the piston 10, the operation of the two cylinders 11 is stopped, and the closure cover 9 is installed.

[0038] Then, one of the interfaces 6 is connected with the exhaust emission port of the automobile, and the exhaust sample is discharged into the collecting box 1 through the connecting pipe 2, and the piston 10 is continuously slid in the collecting box 1 by the cylinder 11 on the side, and the exhaust gas and the remaining air in the collecting cavity 13 are discharged through the transition pipe 3 and the one-way valve 4.

[0039] Then, the one-way valve 4 is closed, and the cylinder 11 on the side is started again to reset the output end to return, at this time, the connecting pipe 2 is connected with the collecting box 1 within the range of the collecting cavity 13, which does not affect the acquisition of the exhaust sample, and under the action of the air suction pump 15, a certain negative pressure environment is formed in the collecting cavity 13, so that the exhaust gas flows into the collecting cavity 13 preferentially and is not easy to mix with the external air, and the air suction rate of the air suction pump 15 and the moving speed of the output end of the cylinder 11 can be controlled in this process, so that the sampling amount of the exhaust sample can be ensured, and the excessive exhaust flow rate can be avoided to forcibly introduce additional air, so that the accuracy of the measurement result can be ensured.

[0040] In the embodiment, as shown in Figure 3 The transition pipe 3 is detachably mounted on the closure cover 9 through the fastening bolt 14, so that the transition pipe 3 and the closure cover 9 can be disassembled and cleaned.

[0041] In the embodiment, as shown in Figure 1 , Figure 3 When the output end of one of the cylinders 11 is in the extended state, the output end of the other cylinder 11 is in the retracted state, so that the tail gas samples can be collected in the two collection boxes 1 together, and the measurement result is not affected by the incomplete removal of impurities or the mixing of a small amount of air in a single collection box 1.

[0042] It should be understood by those skilled in the art that the above discussion of any of the embodiments is only exemplary, and is not intended to imply that the scope of the utility model (including claims) is limited to these examples; the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above, which are not provided in details for the sake of brevity.

[0043] The utility model aims at covering all such alternatives, modifications and variations falling within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An air exhaust structure of a vehicle exhaust detection device, comprising a collecting box (1) and a connecting pipe (2) arranged on the collecting box (1), a one-way valve (4) is connected to the collecting box (1) through a transition pipe (3), a hose (5) is connected to the connecting pipe (2), an interface (6) is arranged at the end of the hose (5), characterized in that, The collecting box (1) is at least two, the air exhaust structure further comprises: The mounting base (7) is fixed with the hanger (8), and the two collecting boxes (1) are installed on both sides of the hanger (8) through the closure cover (9); The piston (10) is slidably arranged in the collecting box (1); The driving assembly for driving the piston (10) to slide.

2. The air exhausting structure of the automobile exhaust detection device according to claim 1, wherein The driving assembly comprises: The air cylinder (11) is installed on the mounting base (7); The connecting head (12) is installed on the piston (10), and the output end of the air cylinder (11) penetrates through the collecting box (1) and is connected with the connecting head (12).

3. The air exhaust structure of the automobile exhaust detection device according to claim 2, wherein The collecting box (1) is between the piston (10) and the closure cover (9) is a gas collection chamber (13).

4. The air exhaust structure of the automobile exhaust detection device according to claim 3, wherein The output end of the air cylinder (11) is in the fully retracted state, and the connecting pipe (2) is communicated with the gas collection chamber (13).

5. The air exhaust structure of the automobile exhaust detection device according to claim 3, wherein The output end of the air cylinder (11) is in the fully extended state, and the piston (10) is in close contact with the closure cover (9).

6. The air exhaust structure of the automobile exhaust detection device according to claim 1, wherein The transition pipe (3) is detachably installed on the closure cover (9) through the fastening bolt (14).

7. The air removal structure of an automobile exhaust gas detection device according to claim 6, wherein The other end of the transition pipe (3) penetrates through the hanger (8) and the mounting base (7) and is installed with the air pump (15), and the one-way valve (4) is installed on the air pump (15).

8. The air exhaust structure of the automobile exhaust detection device according to claim 2, wherein When the output end of one of the air cylinders (11) is in the extended state, the output end of the other air cylinder (11) is in the retracted state.

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