Automobile exhaust sampling device

Abstract

The utility model relates to an automobile exhaust sampling device, which belongs to the field of sampling equipment, and comprises a connecting pipe, the connecting pipe is connected with a transition gas tank, the transition gas tank is connected with a first gas outlet pipe and a second gas outlet pipe, the first gas outlet pipe is connected with a first switch valve, and the second gas outlet pipe is connected with a check valve; the air blower is connected to the connecting pipe, an air outlet of the air blower faces the side where the transition air tank is located, and an air inlet of the air blower faces the side opposite to the side where the transition air tank is located. The gas collecting tank is connected with the second gas outlet pipe, and a pressure relief component is further connected to the gas collecting tank; by arranging the transition gas tank and the collection gas tank, the air content in the collected tail gas can be reduced, and the tail gas analysis and detection accuracy is improved; meanwhile, according to the sampling device, tail gas sampling and tail gas emission work when sampling is not carried out are achieved by opening and closing the first switch valve, sampling carried out in a vehicle running normally is completed, and the accuracy of detection and analysis of sampled tail gas is improved.

Description

Technical Field

[0001] The utility model relates to the field of sampling equipment, in particular to an automobile exhaust sampling device. Background Art

[0002] Automobile exhaust contains solid suspended particulate matter, carbon monoxide, carbon dioxide, sulfur dioxide, and other pollutants. These pollutants not only pollute the atmosphere but also endanger human health. Therefore, analyzing and testing automobile exhaust has become an essential part of human work. Current automobile exhaust testing is typically performed during annual vehicle inspections, primarily to assess the vehicle's driving status. The accuracy requirements for exhaust composition analysis and concentration testing are relatively low. However, when more accurate exhaust analysis and concentration testing are required, using a specialized exhaust sampling device to collect gas samples is more reliable. While various exhaust sampling devices exist, a common problem is that the exhaust is often contaminated with air, which significantly impacts the accuracy of exhaust testing. For example, patent CN220912761U discloses a motor vehicle exhaust gas sampling device in which a collection bag is connected to the rear end of the second tube. The collection bag itself is filled with air, and even after being filled, the collection bag is not sealed, leaving it exposed to the air. This significantly increases the amount of air present, which in turn reduces the accuracy of the detection. Furthermore, the aforementioned patented technology has a serious problem: it cannot be used on a normally moving vehicle because the continuously exhausted gas cannot pass through. It can only be used during the initial start-up phase of the vehicle, where engine operation is unstable, which also affects the accuracy of exhaust gas sampling. Utility Model Content

[0003] Existing sampling devices will be mixed with a lot of air when collecting automobile exhaust for sampling, resulting in inaccurate exhaust gas detection after sampling. This problem exists in the above-mentioned patented technology. Moreover, the above-mentioned patented technology cannot sample exhaust gas on a vehicle that is driving normally because the gas cannot be discharged. It can only be performed at the initial stage of vehicle startup, but the engine operation is unstable at this time, affecting the accuracy of exhaust gas sampling. At least one aspect or one purpose of the present application can solve the above-mentioned problem. Specifically, a vehicle exhaust sampling device is designed, and the technical solution adopted is as follows:

[0004] An automobile exhaust sampling device, comprising:

[0005] A connecting pipe, the connecting pipe is connected to a transition gas tank, the transition gas tank is connected to a first gas outlet pipe and a second gas outlet pipe, the first gas outlet pipe is connected to a first switch valve, and the second gas outlet pipe is connected to a check valve;

[0006] A blower is connected to the connecting pipe, with its air outlet facing the side where the transition gas tank is located and its air inlet facing the side opposite to the side where the transition gas tank is located, and the pressure of the blower is greater than the opening pressure of the check valve;

[0007] The gas collecting tank is connected to the second gas outlet pipe. The gas collecting tank is also connected to a pressure relief component. The pressure relief pressure of the pressure relief component is lower than the pressure of the blower.

[0008] Preferably, the pressure relief component is implemented by a pressure relief valve.

[0009] Preferably, the check valve is a one-way valve.

[0010] Preferably, the gas collecting tank is further provided with an exhaust pipe, and the exhaust pipe is connected to a second switch valve.

[0011] Preferably, the connecting pipe includes a pipe body, and the pipe body is connected to a clamping fixture at one end away from the transition gas tank for connection to the exhaust pipe of the automobile.

[0012] Preferably, the clamping fixture is a clamp, or the clamping fixture includes two tightening blocks, each tightening block is connected to the inner wall of the tube body through a spring, the tube body is symmetrically provided with two threaded holes, each threaded hole is provided with a bolt, and the central axis of each threaded hole passes through the center of the tightening block.

[0013] Preferably, the diameter of the first air outlet pipe is not smaller than the diameter of the connecting pipe, and the diameter of the second air outlet pipe is smaller than the diameter of the first air outlet pipe.

[0014] The utility model can reduce the air content in the collected exhaust gas by setting a transition gas tank and a collection gas tank, thereby improving the accuracy of exhaust gas analysis and detection; at the same time, the sampling device of the present application relies on opening and closing the first switch valve to realize exhaust gas sampling and exhaust gas emission when no sampling is performed, completes sampling in a normally running vehicle, and improves the accuracy of sampled exhaust gas detection and analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 This is a schematic diagram of a structure in which the clamping fixture is in the form of a clamp;

[0017] Figure 3 It is a structural diagram showing another form of clamping fixture.

[0018] In the figure, 1. connecting pipe, 2. clamping fixture, 201. bolt, 202. threaded hole, 203. spring, 204. tightening block, 3. axial flow fan, 4. transition gas tank, 5. first air outlet pipe, 6. first switch valve, 7. second air outlet pipe, 8. one-way valve, 9. exhaust pipe, 10. second switch valve, 11. collecting gas tank, 12. pressure relief valve. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0020] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] like Figure 1-3 As shown, a vehicle exhaust sampling device includes a connecting pipe 1, a transition gas tank 4, a blower, and a collection gas tank 11. The transition gas tank 4 is connected to one end of the connecting pipe 1, and the other end of the connecting pipe 1 is connected to the vehicle exhaust pipe. The transition gas tank 4 is also connected to a first outlet pipe 5 and a second outlet pipe 7. The first outlet pipe 5 and the connecting pipe 1 are arranged parallel to each other in a straight line. In this way, when exhaust sampling is not performed, the arrangement of the first outlet pipe 5 and the connecting pipe 1 can reduce gas resistance and facilitate gas discharge. The second outlet pipe 7 is arranged perpendicular to the connecting pipe 1. The second outlet pipe 7 and the first outlet pipe 5 are arranged in different directions, which can more reasonably occupy the position of the transition gas tank 4, making the structure more compact and more rational.

[0022] The above-mentioned blower is preferably a small axial flow fan 3, the two ends of the axial flow fan 3 are connected to the connecting pipe 1 by bolts, its air outlet is toward the side where the transition gas tank 4 is located, and its air inlet is toward the side opposite to the side where the transition gas tank 4 is located. The pressure of the blower is greater than the opening pressure of the check valve. The blower is powered on electrically. When the blower is turned on, it accelerates and pressurizes the exhaust gas in the automobile exhaust pipe and flows it to the transition gas tank 4 and the collection gas tank 11.

[0023] The gas collecting tank 11 is specifically connected to the second gas outlet pipe 7 . A pressure relief component is also connected to the gas collecting tank 11 , and the pressure relief pressure of the pressure relief component is lower than the pressure of the blower.

[0024] The first air outlet pipe 5 is connected to a first switch valve 6, which is an electric switch valve, and its opening and closing are controlled by connecting to an external control module, and the second air outlet pipe 7 is connected to a check valve, preferably a one-way valve 8, which has a simple structure, small size and is easy to install.

[0025] When exhaust sampling is not being performed (during normal exhaust), the blower is turned on, and the first on-off valve 6 is opened. The first on-off valve 6 is then closed based on the above. The blower pressure is greater than the opening pressure of the one-way valve 8, and the exhaust gas enters the gas collection tank 11. Since the pressure relief pressure of the pressure relief component is less than the blower pressure, when the collection tank is full of exhaust gas, the exhaust gas is discharged from the pressure relief component. This process also evacuates the air in the gas collection tank 11, reducing the impact of air on the detection data. The first on-off valve 6 is then opened, and the gas preferentially passes through the first outlet pipe 5. At this time, the pressure relief component and the one-way valve 8 are automatically closed, forming a sealed tank for the gas collection tank 11, and the vehicle then performs the normal exhaust process. The vehicle is then stopped, the blower stops running, and the sampling device is removed from the vehicle.

[0026] Furthermore, the pressure relief component is implemented by a pressure relief valve 12 .

[0027] Of course, in an alternative embodiment, the above-mentioned pressure relief component can also be implemented by using a currently existing overflow valve.

[0028] Furthermore, the gas collecting tank 11 is provided with an exhaust pipe 9 , to which a second switch valve 10 is connected. The second switch valve 10 is preferably a manual valve. The exhaust gas in the gas collecting tank 11 can be extracted by opening the second switch valve 10 .

[0029] Furthermore, the connecting pipe 1 includes a pipe body, and a clamping fixture 2 is connected to the end of the pipe body away from the transition gas tank 4. When connected to the automobile exhaust pipe, the end of the pipe body is sleeved outside the exhaust pipe and fixed by the clamping fixture 2.

[0030] Of course, during actual operation, for the sake of stability, the device can be fixed by conventional operation such as hanging it on one end of the first air outlet pipe 5 by using a hanging ring.

[0031] In one embodiment, Figure 2 As shown, the clamping member 2 can be a clamp, or it can be in the following manner: Figure 3 As shown, the above-mentioned clamping fixture 2 includes two tightening blocks 204, each tightening block 204 is connected to the inner wall of the tube body through a spring 203, and the tube body is symmetrically provided with two threaded holes 202, each threaded hole 202 is provided with a bolt 201, and the central axis of each threaded hole 202 passes through the center of the tightening block 204. Tightening the bolt 201 to abut the tightening block 204 will press the tightening block 204 on the exhaust pipe to achieve fixation. When disassembling, tighten the bolt 201 to separate the bolt 201 from the tightening block 204.

[0032] Furthermore, the diameter of the first outlet pipe 5 is not less than the diameter of the connecting pipe 1, so that when the first switch valve 6 is opened, the exhaust flow rate is satisfied and guaranteed to be large enough and the exhaust is discharged in time. The diameter of the second outlet pipe 7 is smaller than the diameter of the first outlet pipe 5, but slightly smaller than the diameter of the first outlet pipe 5, so that the exhaust flow rate can be increased as much as possible and the exhaust gas can be discharged in time.

[0033] The above specific implementation methods cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or transformation made to the implementation methods of the present utility model falls within the protection scope of the present utility model.

[0034] Anything not described in detail in the present invention is well known to those skilled in the art.

Claims

1. An automobile exhaust sampling device, characterized in that: include: A connecting pipe, the connecting pipe is connected to a transition gas tank, the transition gas tank is connected to a first gas outlet pipe and a second gas outlet pipe, the first gas outlet pipe is connected to a first switch valve, and the second gas outlet pipe is connected to a check valve; a blower connected to the connecting pipe, with its air outlet facing the side where the transition gas tank is located and its air inlet facing the side opposite to the side where the transition gas tank is located, and the pressure of the blower being greater than the opening pressure of the check valve; A gas collecting tank is connected to the second gas outlet pipe. A pressure relief component is further connected to the gas collecting tank, and the pressure relief pressure of the pressure relief component is lower than the pressure of the blower.

2. The automobile exhaust sampling device according to claim 1, characterized in that: The pressure relief component is realized by a pressure relief valve.

3. The automobile exhaust sampling device according to claim 1, characterized in that: The check valve is a one-way valve.

4. The automobile exhaust sampling device according to claim 1, characterized in that: The gas collecting tank is also provided with an exhaust pipe, and the exhaust pipe is connected to a second switch valve.

5. The automobile exhaust sampling device according to claim 1, characterized in that: The connecting pipe comprises a pipe body, and the pipe body is connected to a clamping fixture at one end away from the transition gas tank for connection to the exhaust pipe of an automobile.

6. The automobile exhaust sampling device according to claim 5, characterized in that: The clamping fixture is a clamp, or the clamping fixture includes two tightening blocks, each of which is connected to the inner wall of the tube body through a spring, and the tube body is symmetrically provided with two threaded holes, each of which is provided with a bolt, and the central axis of each threaded hole passes through the center of the tightening block.

7. The automobile exhaust sampling device according to claim 1, characterized in that: The diameter of the first air outlet pipe is not less than the diameter of the connecting pipe, and the diameter of the second air outlet pipe is less than the diameter of the first air outlet pipe.

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