Gas taking mechanism, exhaust system, tail gas detection system and vehicle

Abstract

The utility model provides a gas taking mechanism, exhaust system, tail gas detection system and vehicle relates to vehicle field, the gas taking mechanism includes gas taking pipe and probe seat, one end of gas taking pipe is connected with probe seat, the gas taking pipe is provided with the gas taking hole, the probe seat is provided with the gas outlet hole, the gas outlet hole is connected with the probe seat. An annular protrusion is arranged in the middle of the probe seat, the side, facing the air taking pipe, of the annular protrusion is a plane, and the multiple air outlet holes are formed in the plane. According to the utility model, gas entering the probe seat from the gas taking pipe can be fully and uniformly mixed in the probe seat and cannot directly flow out from the gas outlet hole, so that the measurement precision of the nitrogen-oxygen sensor is improved.

Description

Technical Field

[0001] The utility model relates to the field of vehicles, and in particular to an air intake mechanism, an exhaust system, an exhaust gas detection system and a vehicle. Background Art

[0002] The nitrogen oxide sensor is an electrical component used to measure the NOx content in engine exhaust. A probe is provided at the gas sampling end. The NOx content in the exhaust is analyzed by sampling the exhaust gas.

[0003] The nitrogen oxide sensor in the prior art is installed in the exhaust tail pipe through an air intake mechanism, which takes air from the exhaust gas, and then the nitrogen oxide sensor detects the NOx content in the exhaust gas. For example, the Chinese utility model patent with the authorization announcement number CN217107172U discloses an air intake mechanism, an exhaust mechanism, an engine exhaust detection system and a vehicle, which takes air through a first air intake pipe, a second air intake pipe, a third air intake pipe and a fourth air intake pipe, and sets an air outlet hole laterally to prevent water or impurities from entering the connecting pipe through the air outlet hole. However, the patent has the problem that part of the air intake does not flow through the nitrogen oxide sensor probe and is directly discharged from the air outlet hole, thereby affecting the measurement accuracy of the nitrogen oxide sensor; in addition, the cavity of the connecting pipe in the patent is small, and the area of ​​the air outlet hole is limited, which limits the gas flow in the air intake pipe. Utility Model Content

[0004] In order to solve at least one deficiency of the prior art, the utility model provides an air intake mechanism, an exhaust system, an exhaust gas detection system and a vehicle, which can fully mix the intake air at the nitrogen oxygen sensor probe to improve the measurement accuracy.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the utility model provides an air intake mechanism, including an air intake pipe and a probe seat, one end of the air intake pipe is connected to the probe seat, the air intake pipe is provided with an air intake hole, the probe seat is provided with an air outlet hole, the middle part of the probe seat has an annular protrusion, the side of the annular protrusion facing the air intake pipe is a plane, and a plurality of the air outlet holes are arranged on the plane.

[0006] Preferably, the plurality of air outlet holes are evenly distributed on the plane in a circular array.

[0007] Preferably, the side of the annular protrusion facing away from the air extraction pipe forms an arc-shaped transition with the top opening of the probe seat.

[0008] Preferably, a connecting bracket is further included, wherein the connecting bracket is fixedly connected to the end of the air intake pipe and is used to fix the air intake pipe inside the exhaust tail pipe.

[0009] Preferably, the air intake pipe is a cross air intake pipe, and a plurality of air intake holes are evenly distributed on one side of the air intake pipe.

[0010] Preferably, the air intake hole is a circular hole, and / or the air outlet hole is a circular hole.

[0011] A second aspect of the present invention provides an exhaust system, including an exhaust tail pipe, wherein an air intake mechanism provided in the first aspect is arranged in the exhaust tail pipe.

[0012] The third aspect of the utility model provides an exhaust gas detection system, including a nitrogen oxide sensor and an exhaust system provided by the second aspect, wherein the probe of the nitrogen oxide sensor extends into the probe seat of the air intake mechanism and is fixedly connected to the exhaust tail pipe.

[0013] Preferably, the probe height of the nitrogen oxygen sensor is lower than the height of the air outlet on the probe base.

[0014] A fourth aspect of the present invention provides a vehicle, comprising an exhaust gas detection system provided by the third aspect.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model provides an air intake mechanism, an exhaust system, an exhaust gas detection system and a vehicle. By improving the probe seat structure of the air intake mechanism, an annular protrusion is provided on the probe seat, and an air outlet is provided on the plane below the annular protrusion, the air entering the probe seat from the air intake pipe can be fully mixed in the probe seat and will not flow out directly from the air outlet, thereby improving the measurement accuracy of the nitrogen oxide sensor.

[0017] 2. The structural design of the annular protrusion and the arc-shaped transition on the upper and lower sides of the annular protrusion greatly increases the cavity volume for accommodating gas in the probe seat; a number of air outlet holes arranged in a circular array form increase the air outlet area, thereby improving the fluidity of the gas in the air intake mechanism and further improving the measurement accuracy.

[0018] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 The explosion diagram of the gas extraction mechanism is shown in FIG.

[0021] Figure 2 The schematic diagram of the structure of the air taking pipe is shown in FIG.

[0022] Figure 3 It is a structural schematic diagram of the probe base;

[0023] Figure 4 This is a bottom view of the probe base;

[0024] Figure 5 is a cross-sectional view of the air intake mechanism;

[0025] Figure 6 It is a schematic diagram of the gas flow direction of the gas extraction mechanism;

[0026] Figure 7 It is a schematic diagram of the assembly of the air intake mechanism and the exhaust tail pipe;

[0027] Figure 8 It is a structural side view of the exhaust tail pipe inlet end surface direction;

[0028] Fig. 9 It is a structural side view of the exhaust tail pipe from the exhaust end side.

[0029] Among them, 1. probe seat; 11. annular protrusion; 12. plane; 13. air outlet; 2. air intake pipe; 21. air intake hole; 3. connecting bracket; 4. nitrogen oxide sensor; 5. exhaust tail pipe. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] It should be noted that in the embodiments, the descriptions of positions such as "up", "down", "top" and "bottom" are based on the orientation of the air intake mechanism when it is actually installed in the exhaust tail pipe. It is only for the convenience of understanding and simplified description and does not represent any special limitation on the structure or position.

[0032] Embodiment 1

[0033] like Figure 1-Figure 9 As shown, a gas extraction mechanism includes a gas extraction pipe 2 and a probe base 1. One end of the gas extraction pipe 2 is connected to the probe base 1, and a gas extraction hole 21 is provided on the gas extraction pipe 2, and a gas outlet hole 13 is provided on the probe base 1. The middle part of the probe base 1 has an annular protrusion 11, and the side of the annular protrusion 11 facing the gas extraction pipe 2 has a plane 12, and a plurality of gas outlet holes 13 are provided on the plane 12.

[0034] The air outlet in the prior art is usually arranged on the side of the connecting pipe to discharge the exhaust gas entering the connecting pipe through the air intake pipe, and the connecting pipe is usually designed in a cylindrical shape. However, in actual use, with this structural design, part of the exhaust gas transported upward near the pipe wall through the air intake pipe will be directly discharged from the air outlet along the pipe wall direction, and will not be mixed with other air intakes in the connecting pipe, thereby causing the gas obtained by the nitrogen oxygen sensor probe to be only part of the exhaust gas transported upward by the air intake pipe and the middle part of the connecting pipe, which affects the measurement accuracy of the nitrogen oxygen sensor. For this reason, the structure of the existing connecting pipe is improved in this embodiment, and the traditional cylindrical connecting pipe is replaced with a probe seat 1 similar to a "flying saucer" shape. Compared with the prior art, the exhaust gas entering the probe seat through the air intake pipe must be reflected once or multiple times by the inner wall of the probe seat cavity before it can be discharged from the air outlet, so that the exhaust gas can be fully mixed and uniform in the probe seat, and the gas obtained by the probe of the nitrogen oxygen sensor is the exhaust gas after being fully mixed, so that the overall NOx content in the exhaust gas can be more accurately reflected.

[0035] The middle part of the probe seat 1 has an annular protrusion 11. The annular protrusion can increase the volume of the cavity inside the probe seat on the one hand, and is used to open an air outlet 13 at the lower part on the other hand. The lower part of the annular protrusion 11, that is, the side facing the air intake pipe, is designed as a plane, and a number of through holes are opened on the plane as air outlets. The form, number, aperture and distribution of the air outlets can be selected according to actual needs. The opening form is not limited to cylindrical holes, but for ease of processing, cylindrical holes are preferably used. The distribution of the openings can be uniform or non-uniform. In some embodiments, the air outlet holes 13 are preferably designed to be evenly distributed in an annular array along the annular plane 12, such as Figure 4 As shown, the gas can be fully mixed and evenly discharged in the cavity and can be discharged in any direction; the aperture and number of the vent holes are increased as much as possible while meeting the strength requirements, thereby improving the gas flow efficiency and ensuring gas flowability.

[0036] The upper part of the annular protrusion 11, that is, the side facing away from the air extraction pipe 2, forms an arc-shaped transition with the top opening of the probe base 1. The top of the probe base 1 has a circular through hole for installing the nitrogen oxygen sensor 4. The annular protrusion and the top opening are designed to have an arc-shaped transition, the purpose of which is to maximize the volume of the cavity inside the probe base. In addition, the lower part of the annular protrusion 11 and the bottom opening of the probe base 1 also adopt a transition design, which can be an arc-shaped transition or a sloped transition, thereby further increasing the volume of the cavity.

[0037] The inner diameter of the bottom opening of the probe base 1 is equal to the outer diameter of the top of the air intake pipe 2. During installation, the top of the air intake pipe 2 is inserted into the bottom opening of the probe base 1, and the two are welded together to ensure sufficient mechanical strength.

[0038] like Figure 8-Figure 9As shown, the principle of the opening of the plane of the probe seat is: it is not visible at the air inlet end face and the air outlet end face of the tail pipe, thereby ensuring that most of the water coming in from the tail pipe cannot enter the probe area through the air outlet hole, thereby reducing the risk of the nitrogen oxide sensor probe bursting when encountering water.

[0039] like Figure 7 As shown, the air intake pipe 2 is connected to the exhaust tail pipe 5 through the connecting bracket 3. The connecting bracket 3 is a plate-like structure with bent ends, having a flat plate portion in the middle and bent portions at both ends of the flat plate portion. The processing method can be to weld the flat plate portion and the bent portion, or to be bent using a complete plate. The shape of the bent portion is adapted to the shape of the inner wall of the exhaust tail pipe 5, so as to facilitate welding in the exhaust tail pipe. The end of the air intake pipe is welded to the center of the flat plate portion of the connecting bracket, and the bent portion of the connecting bracket contacts and welds with the inner wall of the exhaust tail pipe, so that the air intake pipe can be welded to the exhaust tail pipe.

[0040] The air intake pipe 2 in this embodiment is a cross air intake pipe, which is connected by two perpendicular tubular parts. In some embodiments, other structural forms of air intake pipes can also be further adopted, such as adding inclined tubular parts on the basis of the cross air intake pipe to form a "M"-shaped air intake pipe, or adding inclined tubular parts at the ends of mutually intersecting and adjacent tubular parts to form an air intake pipe in the form of CN217107172U to collect exhaust gas in all directions, thereby ensuring the uniformity of air intake, better reflecting the actual composition of exhaust gas, and ensuring the measurement accuracy of nitrogen oxygen sensor. The air intake pipe 2 is provided with a plurality of air intake holes 21 facing the exhaust gas outlet direction. For ease of processing, the air intake holes are preferably circular holes, and can also be designed as hole structures of other shapes according to actual needs.

[0041] Each component of the air intake mechanism provided in this embodiment is made of high-temperature resistant metal materials to ensure reliability during long-term use in an exhaust tail pipe with high exhaust temperature, and is easy to connect by welding to ensure mechanical strength.

[0042] like Figure 5-Figure 6As shown, the direction of the arrow in the figure is the gas flow direction of the tail gas. When the air intake mechanism provided by this embodiment is in use, when the tail gas flows through the exhaust tail pipe, part of the air flow enters the air intake pipe through the air intake hole on the air intake pipe, and then enters the cavity of the probe seat, flows through the probe of the nitrogen oxygen sensor, and is reflected by the inner wall of the arc surface at the top of the cavity, and is discharged from the flat air outlet hole at the bottom of the annular protrusion. It has been verified by simulation that the fluidity and mixing degree of the gas are significantly improved. Compared with the prior art, on the one hand, the air outlet is set downward, which can make the intake air evenly mixed in the cavity before being discharged, and the probe of the nitrogen oxygen sensor can detect the evenly mixed tail gas, thereby improving the measurement accuracy of the nitrogen oxygen sensor. On the other hand, the increase in the cavity volume and the increase in the air outlet area can improve the fluidity of the gas in the air intake mechanism, thereby further improving the measurement accuracy.

[0043] Embodiment 2

[0044] Based on the first embodiment, this embodiment further provides an exhaust system, including an exhaust tail pipe 5 , in which an air intake mechanism provided in the first embodiment is installed.

[0045] The exhaust tail pipe 5 is a cylindrical structure, the connection bracket 3 of the air intake mechanism is adapted to the inner wall shape of the exhaust tail pipe 5, the air intake mechanism is welded in the exhaust tail pipe 5 through the connection bracket 3, and the side of the air intake pipe with the air intake hole faces the exhaust direction of the exhaust gas to sample the exhaust gas. The air outlet of the probe seat of the air intake mechanism is directed downward to reduce the risk of being splashed by water, and at the same time, the exhaust gas can be evenly mixed in the cavity of the probe seat to improve the measurement accuracy.

[0046] Embodiment 3

[0047] On the basis of the second embodiment, this embodiment further provides an exhaust gas detection system, including a nitrogen oxygen sensor 4 and an exhaust system provided in the second embodiment. An opening for installing the sensor is provided at the position where the exhaust tail pipe 5 is installed with the air intake mechanism, and a nut seat for fixing the nitrogen oxygen sensor is provided at the opening. After the nitrogen oxygen sensor 4 passes through the opening of the exhaust tail pipe and the opening at the top of the probe seat of the air intake mechanism, it extends into the interior of the probe seat and is fixedly connected to the exhaust tail pipe through the nut seat. The installed nitrogen oxygen sensor 4 is perpendicular to the axis of the exhaust tail pipe 5.

[0048] In order to ensure the measurement accuracy of the nitrogen oxide sensor, the height of the nitrogen oxide sensor probe after installation should be lower than the height of the air outlet on the probe base so that the probe can be in more complete contact with the exhaust gas.

[0049] The nitrogen oxide sensor is connected to the vehicle electronic control unit (ECU) through wiring pins, and the collected NOx information is transmitted to the ECU for controlling the engine and after-treatment system.

[0050] Embodiment 4

[0051] Based on the second embodiment, this embodiment further provides a vehicle, including an exhaust gas detection system provided in the third embodiment. The vehicle may be a passenger car, a commercial vehicle, a non-road mobile machine, and the like.

[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gas extraction mechanism, comprising a gas extraction pipe and a probe seat, wherein one end of the gas extraction pipe is connected to the probe seat, the gas extraction pipe is provided with a gas extraction hole, and the probe seat is provided with a gas outlet hole, characterized in that: The middle part of the probe seat is provided with an annular protrusion, and the side of the annular protrusion facing the air intake pipe is a plane, and a plurality of the air outlet holes are arranged on the plane.

2. A gas extraction mechanism according to claim 1, characterized in that: The plurality of air outlet holes are evenly distributed on the plane in a circular array.

3. A gas extraction mechanism according to claim 1, characterized in that: The side of the annular protrusion facing away from the air extraction pipe forms an arc-shaped transition with the top opening of the probe seat.

4. A gas extraction mechanism according to claim 1, characterized in that: It also includes a connecting bracket, which is fixedly connected to the end of the air intake pipe and is used to fix the air intake pipe inside the exhaust tail pipe.

5. The air extraction mechanism according to claim 1, characterized in that: The air intake pipe is a cross air intake pipe, and a plurality of air intake holes are evenly distributed on one side of the air intake pipe.

6. A gas extraction mechanism according to claim 1, characterized in that: The air intake hole is a circular hole, and / or the air outlet hole is a circular hole.

7. An exhaust system, characterized in that: It comprises an exhaust tail pipe, in which an air intake mechanism as described in any one of claims 1 to 6 is arranged.

8. An exhaust gas detection system, characterized in that: It comprises a nitrogen oxide sensor and an exhaust system as claimed in claim 7, wherein the probe of the nitrogen oxide sensor extends into the probe seat of the air intake mechanism and is fixedly connected to the exhaust tail pipe.

9. An exhaust gas detection system as claimed in claim 8, characterized in that: The probe height of the nitrogen oxygen sensor is lower than the height of the air outlet on the probe base.

10. A vehicle, characterized in that: It comprises an exhaust gas detection system as described in any one of claims 8-9.

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