Automobile exhaust detection device

Abstract

The utility model relates to the technical field of tail gas detection, and particularly discloses an automobile exhaust tail gas detection device which comprises a bottom plate, a box body arranged above the bottom plate and provided with an exhaust pipe, a detection host arranged in the box body, a pretreatment box arranged on the left side of the box body and a connecting hose communicated with the outer side wall of the pretreatment box, the pretreatment box is in a U shape, a first refrigerator is arranged at the top of the pretreatment box, a dehumidification mechanism is arranged between the pretreatment box and the box body, the dehumidification mechanism comprises a fixed cylinder communicating with the right side wall of the pretreatment box through a pipeline, the upper end and the lower end of the fixed cylinder are open, and the bottom of the fixed cylinder communicates with a drainage pipe; the device can cool and dehumidify tail gas, prevent water vapor in the tail gas from influencing a detection result, improve the precision of detection data, prevent the water vapor from entering the detection host, prevent the detection host from being damaged, and prolong the service life of the detection host.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas detection technology, and specifically discloses a vehicle exhaust gas detection device. Background Technology

[0002] Vehicle exhaust emissions are another major factor in air pollution. Vehicle exhaust contains carbon monoxide, nitrogen oxides, and other solid particles that have adverse effects on human health. Leaded gasoline, in particular, is even more harmful to human health. The analysis and measurement of the composition and concentration of exhaust gases emitted by motor vehicles at idle or under operating conditions are conducted on-site or on a test bench. The large amount of harmful exhaust gases emitted by motor vehicles during operation is a major mobile source of ambient air pollution, and exhaust gas detection is an important part of ambient air pollution monitoring.

[0003] Chinese patent CN215066528U discloses a vehicle exhaust gas detection device, including a housing, a pretreatment box located in the middle of one side of the housing, and a connector located at the end of the pretreatment box away from the housing. The housing includes an air duct at the bottom of its interior, a fixing frame at the bottom of the air duct, a motor located in the middle of the fixing frame, fan blades at the motor's output end, a condensate pipe located in the middle of the housing, and fixing strips at both ends of the housing. This invention uses the fixing frame to fix the motor and air duct. The motor drives a rotating shaft, which in turn drives the fan blades to rotate. The rotating fan blades generate airflow, which is cooled by the condensate pipe. This cooled airflow then cools the main detection unit, preventing damage from high temperatures and improving the device's heat dissipation.

[0004] In actual use, the aforementioned device has several drawbacks. Since automobile exhaust contains water vapor (gasoline, diesel, and other fuels are hydrocarbons; when burned in the engine, they react with oxygen in the air to produce water in addition to carbon dioxide, which is then expelled as water vapor with the exhaust), the device cools the exhaust during testing. This water vapor liquefies and enters the main testing unit along with the exhaust, interfering with the accurate measurement of gas concentration and potentially damaging the main testing unit. Therefore, improvements are needed. Utility Model Content

[0005] This utility model proposes a vehicle exhaust gas detection device that can cool and dehumidify the exhaust gas, prevent water vapor in the exhaust gas from affecting the detection results, improve the accuracy of the detection data, and prevent water vapor from entering the detection host, thus preventing damage to the detection host and extending its service life.

[0006] This utility model is implemented as follows: a vehicle exhaust gas detection device includes a base plate, a box body with an exhaust pipe disposed above the base plate, a detection host disposed inside the box body, a pretreatment box disposed on the left side of the box body, and a connecting hose communicating with the outer wall of the pretreatment box. The pretreatment box is U-shaped and a first cooler is disposed on the top. A dehumidification mechanism is disposed between the pretreatment box and the box body.

[0007] The dehumidification mechanism includes a fixed cylinder connected to the right side wall of the pretreatment box via a pipe. The upper and lower ends of the fixed cylinder are open, and a drain pipe is connected to the bottom of the fixed cylinder. An electric valve is installed on the outer side wall of the drain pipe. The top of the fixed cylinder is connected to an inverted funnel-shaped connecting pipe. The other end of the connecting pipe is connected to a funnel-shaped drain cover with a closed top. The top of the drain cover is connected to two left and right distributed diversion pipes. The other ends of the two diversion pipes are connected to a vent pipe.

[0008] As a preferred embodiment of the vehicle exhaust gas detection device of this utility model, a second cooler is provided in the middle of the top of the lower water cover, and the cooling fins at the bottom of the first cooler and the second cooler extend into the interior of the pretreatment box and the lower water cover, respectively.

[0009] As a preferred embodiment of the vehicle exhaust gas detection device of this utility model, the other end of the vent pipe passes through the top of the housing and is connected to the air inlet port of the detection host.

[0010] As a preferred embodiment of the vehicle exhaust gas detection device of this utility model, a fixing ring is fixedly installed on the outer wall of the connecting pipe and fixedly installed on the outer wall of the housing.

[0011] As a preferred embodiment of the vehicle exhaust gas detection device of this utility model, the front end face of the housing has a through port, a fan is installed inside the port, and a heat dissipation port is provided on the right side wall of the housing.

[0012] In a preferred embodiment of the vehicle exhaust gas detection device of this utility model, the connecting hose is connected to a connector on the side away from the pretreatment box, and two symmetrically distributed screws are threaded through the outer wall of the connector, with a clamping plate rotatably connected to the opposite end of each of the two screws.

[0013] As a preferred embodiment of the vehicle exhaust gas detection device of this utility model, the bottom of the base plate is equipped with multiple self-locking casters, and a support platform is installed between the bottom of the base plate and the bottom of the box and the bottom of the pretreatment box, respectively.

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

[0015] This invention utilizes a first cooler to cool the exhaust gas. Water vapor in the exhaust gas is pre-cooled and liquefied, flowing into a drain pipe along the bottom of the pretreatment tank. The connecting pipe also acts as a barrier, allowing water vapor to condense at the bottom of the connecting pipe and flow into the drain pipe. A second cooler further cools the exhaust gas, liquefying and dehumidifying the water vapor. The dehumidified and cooled exhaust gas then enters the detection unit through a vent pipe for testing. This prevents water vapor in the exhaust gas from affecting the test results, improving the accuracy of the test data. Furthermore, it prevents water vapor from entering the detection unit, thus preventing damage and extending its service life. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is an overall cross-sectional view of the automobile exhaust gas detection device of this utility model;

[0018] Figure 2 This is a structural diagram of the dehumidification mechanism of this utility model;

[0019] Figure 3 This is a left view of the connector of this utility model;

[0020] Figure 4 This is a structural diagram of the housing of this utility model.

[0021] The markings in the diagram are: 1. Base plate; 2. Box body; 201. Detection host; 202. Exhaust pipe; 203. Fan; 204. Heat dissipation port; 3. Pre-treatment box; 3011. First cooler; 301. Connecting hose; 302. Connector; 303. Screw; 304. Clamping plate; 4. Fixing cylinder; 401. Drain pipe; 402. Electric valve; 5. Connecting pipe; 501. Fixing ring; 6. Drain cover; 601. Diverter pipe; 602. Second cooler; 7. Vent pipe; 8. Support platform. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0023] Please see Figure 1-4A vehicle exhaust gas detection device includes a base plate 1, a housing 2 with an exhaust pipe 202 disposed above the base plate 1, a detection host 201 disposed inside the housing 2, a pretreatment box 3 disposed on the left side of the housing 2, and a connecting hose 301 communicating with the outer wall of the pretreatment box 3. The pretreatment box 3 is U-shaped and a first cooler 3011 is disposed on the top. A dehumidification mechanism is disposed between the pretreatment box 3 and the housing 2.

[0024] The dehumidification mechanism includes a fixed cylinder 4 connected to the right side wall of the pretreatment box 3 via a pipe. The upper and lower ends of the fixed cylinder 4 are open, and the bottom of the fixed cylinder 4 is connected to a drain pipe 401. An electric valve 402 is installed on the outer side wall of the drain pipe 401. The top of the fixed cylinder 4 is connected to an inverted funnel-shaped connecting pipe 5. The other end of the connecting pipe 5 is connected to a funnel-shaped drain cover 6 with a closed top. The top of the drain cover 6 is connected to two left and right distributed diversion pipes 601. The other ends of the two diversion pipes 601 are connected to a vent pipe 7.

[0025] In this embodiment: the vehicle exhaust gas is introduced into the pretreatment box 3 through the vehicle exhaust pipe via the connecting hose 301. At this time, the first cooler 3011 cools the exhaust gas, and the water vapor in the exhaust gas is pre-cooled and liquefied, flowing into the drain pipe 401 along the bottom of the pretreatment box 3. The connecting pipe 5 can also block the water vapor, allowing it to condense at the bottom of the connecting pipe 5 and flow into the drain pipe 401. Then, when the exhaust gas, after initial cooling, enters the lower water cover 6, the second cooler 602 can further cool the exhaust gas and further liquefy and dehumidify the water vapor in the exhaust gas. The dehumidified and cooled exhaust gas can enter the detection host 201 through the vent pipe 7 for exhaust gas detection, avoiding the influence of water vapor in the exhaust gas on the detection results, improving the accuracy of the detection data, and preventing water vapor from entering the detection host 201, thus preventing damage to the detection host 201 and extending its service life.

[0026] As a technical optimization of this utility model, a second cooler 602 is provided in the middle of the top of the water cover 6, and the cooling fins at the bottom of the first cooler 3011 and the second cooler 602 extend into the interior of the pretreatment box 3 and the water cover 6, respectively.

[0027] In this embodiment, when the cooling plates of the first cooler 3011 and the second cooler 602 are used for cooling, the automobile exhaust gas introduced into the pretreatment box 3 and the water cover 6 can be cooled respectively.

[0028] As a technical optimization of this utility model, the other end of the vent pipe 7 passes through the top of the box 2 and is connected to the air inlet port of the detection host 201.

[0029] In this embodiment: the cooled and dehumidified vehicle exhaust gas can be introduced into the interior of the detection host 201 through the vent pipe 7.

[0030] As a technical optimization of this utility model, a fixing ring 501 is fixedly installed on the outer side wall of the connecting pipe 5 and fixedly installed on the outer side wall of the box 2.

[0031] In this embodiment: the fixing ring 501 facilitates the fixing of the position of the connecting pipe 5, thereby fixing the position of the dehumidification mechanism.

[0032] As a technical optimization of this utility model, a port is provided through the front end face of the box 2, and a fan 203 is installed inside the port. A heat dissipation port 204 is provided on the right side wall of the box 2.

[0033] In this embodiment: by starting the fan 203, external airflow can enter the interior of the housing 2, and hot airflow inside the housing 2 is discharged from the heat dissipation port 204, so that the airflow in the housing 2 can circulate and dissipate heat from the detection host 201.

[0034] As a technical optimization of this utility model, the connecting hose 301 is connected to a connector 302 on the side away from the pretreatment box 3. The outer wall of the connector 302 is threaded through two symmetrically distributed screws 303. The opposite ends of the two screws 303 are rotatably connected to a clamp 304.

[0035] In this embodiment: one end of the vehicle exhaust pipe is inserted into the connector 302, and by rotating the two screws 303, the two clamps 304 clamp and fix the vehicle exhaust pipe, thereby increasing the stability of the connection.

[0036] As a technical optimization of this utility model, the bottom of the base plate 1 is equipped with multiple self-locking casters, and the bottom of the base plate 1 is equipped with support platforms 8 between the bottom of the box 2 and the bottom of the pretreatment box 3.

[0037] In this embodiment: the self-locking casters facilitate the movement of the device, and the support platform 8 provides support for the box 2 and the pretreatment box 3.

[0038] The working principle and usage process of this utility model are as follows: First, the device is electrically connected to the operation panel or switch. In use, one end of the vehicle exhaust pipe is inserted into the connector 302, and the two screws 303 are rotated to clamp and fix the vehicle exhaust pipe in place by the two clamping plates 304. The device is then powered on, and the first cooler 3011 and the second cooler 602 are activated via the operation panel or switch. Next, vehicle exhaust gas is passed through the exhaust pipe into the connecting hose 301, allowing the exhaust gas to enter the pretreatment box 3 along the connecting hose 301. At this time, the first cooler 3011 cools the exhaust gas, and the water vapor in the exhaust gas is pre-cooled and liquefied, flowing down the bottom of the pretreatment box 3 into the drain pipe 401. Furthermore, the connecting pipe 5 can block water vapor, allowing it to condense at the bottom of the connecting pipe 5 and flow into the drain pipe 401. After initial cooling, the exhaust gas enters the lower water cover 6, where the second cooler 602 further cools the exhaust gas and liquefies and dehumidifies the water vapor. The dehumidified and cooled exhaust gas can then enter the detection host 201 through the vent pipe 7 for testing. This prevents water vapor in the exhaust gas from interfering with certain testing items, such as gas concentration measurement, causing deviations in the test results, improving the reliability of the test data, and preventing damage to the detection host 201. After testing, the exhaust gas is discharged through the exhaust pipe 202. By opening the electric valve 402 on the drain pipe 401, the water collected in the drain pipe 401 can be discharged.

[0039] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A vehicle exhaust gas detection device, comprising a base plate (1), a housing (2) disposed above the base plate (1) and having an exhaust pipe (202), a detection host (201) disposed inside the housing (2), a pretreatment box (3) disposed on the left side of the housing (2), and a connecting hose (301) communicating with the outer wall of the pretreatment box (3), characterized in that: The pretreatment box (3) is U-shaped and has a first refrigeration unit (3011) on top. A dehumidification mechanism is provided between the pretreatment box (3) and the box body (2). The dehumidification mechanism includes a fixed cylinder (4) connected to the right side wall of the pretreatment box (3) via a pipe. The upper and lower ends of the fixed cylinder (4) are open, and the bottom of the fixed cylinder (4) is connected to a drain pipe (401). An electric valve (402) is installed on the outer side wall of the drain pipe (401). The top of the fixed cylinder (4) is connected to an inverted funnel-shaped connecting pipe (5). The other end of the connecting pipe (5) is connected to a funnel-shaped and closed-top drain cover (6). The top of the drain cover (6) is connected to two left and right distributed diversion pipes (601). The other ends of the two diversion pipes (601) are connected to a common vent pipe (7).

2. The vehicle exhaust gas detection device according to claim 1, characterized in that: A second cooler (602) is provided in the middle of the top of the water cover (6), and the cooling fins at the bottom of the first cooler (3011) and the second cooler (602) extend into the interior of the pretreatment tank (3) and the water cover (6), respectively.

3. The vehicle exhaust emission detection device according to claim 1, characterized in that: The other end of the vent pipe (7) passes through the top of the housing (2) and is connected to the air inlet port of the detection host (201).

4. The vehicle exhaust gas detection device according to claim 1, characterized in that: The outer wall of the connecting pipe (5) is fixedly installed with a fixing ring (501) that is fixedly installed on the outer wall of the box (2).

5. The vehicle exhaust gas detection device according to claim 1, characterized in that: The front end face of the housing (2) is provided with a port, and a fan (203) is installed inside the port. The right side wall of the housing (2) is provided with a heat dissipation port (204).

6. The vehicle exhaust gas detection device according to claim 1, characterized in that: The connecting hose (301) is connected to a connector (302) on the side away from the pretreatment box (3). The outer wall of the connector (302) is threaded through two symmetrically distributed screws (303). The opposite ends of the two screws (303) are rotatably connected to a clamp (304).

7. The vehicle exhaust gas detection device according to claim 1, characterized in that: The bottom of the base plate (1) is equipped with multiple self-locking casters, and a support platform (8) is installed between the bottom of the base plate (1) and the bottom of the box (2) and the bottom of the pretreatment box (3).

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