An exhaust gas sampling device

Abstract

The present disclosure relates to an exhaust gas sampling device, comprising: a sampling tube, a sampling head, a sleeve and a movable buckle; wherein, the sleeve is adjustably sleeved outside the sampling tube, one end of the sampling tube is communicated with the sampling head, and the movable buckle is arranged on the sleeve; the movable buckle is used for tightly pressing against the outer wall of the exhaust pipe when the sampling head extends into the vehicle exhaust pipe, so as to fix the sampling head inside the exhaust pipe; the sampling head is used for collecting the exhaust gas discharged by the vehicle. The exhaust gas sampling device can be fixed on the vehicle exhaust pipe, and the fixing structure is simple, and it is easy to install and disassemble.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle environmental protection detection, and specifically, to an exhaust gas sampling device. Background Art

[0002] In the process of detecting the emissions of particulate matter or harmful gases in vehicle exhaust, it is necessary to collect the emitted exhaust gas. When collecting, it is necessary to insert the sampling port of the sampling device into the vehicle exhaust pipe. In the related art, it is usually necessary to fix the sampling port in the exhaust pipe and then fix it through external fixing components (such as tape, wire, etc.), and the position of the sampling port relative to the exhaust pipe cannot be flexibly adjusted. Summary of the Invention

[0003] The purpose of the present disclosure is to provide an exhaust gas sampling device to solve the technical problem of too long time used in the existing particulate matter concentration detection.

[0004] In a first aspect, the present disclosure provides an exhaust gas sampling device, including: a sampling tube, a sampling head, a sleeve and a movable buckle; wherein,

[0005] The sleeve is adjustably sleeved outside the sampling tube, one end of the sampling tube is communicated with the sampling head, and the movable buckle is arranged on the sleeve;

[0006] The movable buckle is used to press against the outer wall of the exhaust pipe when the exhaust gas sampling device is in the sampling working state, so as to fix the sampling head inside the exhaust pipe;

[0007] The sampling head is used to collect the exhaust gas discharged by the vehicle.

[0008] Optionally, the sampling head includes: a sampling port and a support member;

[0009] Wherein, the sampling port passes through the center of the support member. When the sampling head is fixed inside the exhaust pipe, the center of the support member is on the axis of the exhaust pipe, and the difference between the projected area of the support member on the target plane and the cross-sectional area of the exhaust pipe is less than a preset value, and the target plane is the cross-section of the exhaust pipe.

[0010] Optionally, the support member is provided with ventilation gaps.

[0011] Optionally, the support member is a fixed support member, and the fixed support member includes: an outer ring, an inner ring and a plurality of spokes. The inner ring is sleeved on the sampling port. One end of each spoke is fixed to the outside of the inner ring, and one end of each spoke is fixed to the inside of the outer ring. The gap between every two spokes is the ventilation gap.

[0012] Optionally, the support member is an adjustable support member, and the adjustable support member includes: a metal hose and an adjustment member;

[0013] Wherein, both the metal hose and the adjustment member are sleeved on the sampling tube, the front end of the metal hose is fixed at the sampling port, the rear end of the metal hose is connected to the front end of the adjustment member, and the adjustment member is used to shorten the relative position between the rear end of the metal hose and the sampling port, so that the metal hose bulges and abuts against the inner wall of the exhaust pipe.

[0014] Optionally, the adjustment member includes a metal straight pipe and a fixing portion; wherein,

[0015] The fixing portion is arranged on the metal straight pipe and is used to fix the relative position between the metal straight pipe and the sampling tube.

[0016] Optionally, the metal hose is a mesh metal hose, and the mesh holes on the mesh metal hose are the ventilation gaps.

[0017] Optionally, the exhaust gas sampling device further includes: a spiral buckle, one end of the spiral buckle is located outside the sleeve, and the other end of the spiral buckle passes through the opening on the sleeve and abuts against the sampling tube to fix the relative position between the sleeve and the sampling tube.

[0018] Optionally, the movable buckle includes: a movable grip, a vertical grip and an elastic member. The vertical grip is vertically fixed on the sleeve. One end of the movable grip is rotatably connected to the vertical grip, and the other end of the movable grip is connected to the vertical grip through the elastic member. An L-shaped fixing member is arranged on the movable grip, and the L-shaped fixing member is used to abut against the outer wall of the exhaust pipe to fix the sampling tube and the exhaust pipe.

[0019] Optionally, the elastic member is a spring.

[0020] Optionally, when fixed inside the vehicle exhaust pipe, the adjustment range of the distance between the sampling head and the pipe orifice of the exhaust pipe is from 0 cm to 30 cm.

[0021] Compared with the prior art, the exhaust gas sampling device provided by the embodiments of the present disclosure includes: a sampling tube, a sampling head, a sleeve and a movable buckle; wherein, the sleeve is adjustably sleeved outside the sampling tube, one end of the sampling tube is communicated with the sampling head, and the movable buckle is arranged on the sleeve; the movable buckle is used to abut against the outer wall of the exhaust pipe when the sampling head extends into the vehicle exhaust pipe to fix the sampling head inside the exhaust pipe; the sampling head is used to collect the exhaust gas discharged by the vehicle. The exhaust gas sampling device can be fixed on the vehicle exhaust pipe, and the fixing structure is simple, and it is easy to install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0023] Figure 1 is a schematic structural diagram of an exhaust gas sampling device shown according to an exemplary embodiment;

[0024] Figure 2 is according to Figure 1 shown is a schematic structural diagram of another exhaust gas sampling device;

[0025] Figure 3 is according to Figure 2 shown is a schematic structural diagram of a sampling head of a sampling tube;

[0026] Figure 4 is a schematic cross-sectional structural diagram of an adjustable support member in an extended state shown according to an exemplary embodiment;

[0027] Figure 5 is according to Figure 4 shown is a schematic cross-sectional structure diagram of an adjustable support member in a bulged state to a common state. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following provides a detailed description of the specific embodiments of the present disclosure in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0029] In this regard, the present disclosure provides an exhaust gas sampling device, specifically as follows:

[0030] Figure 1 is a schematic structural diagram of an exhaust gas sampling device shown according to an exemplary embodiment. As Figure 1 shown, the exhaust gas sampling device 100 includes: a sampling tube 110, a sampling head 120, a sleeve 130, and a movable buckle 140.

[0031] Among them, the inner diameter of the sleeve 130 is slightly larger than the outer diameter of the sampling tube 110, and the difference between the inner diameter of the sleeve 130 and the outer diameter of the sampling tube 110 can be, for example, 2 mm (millimeter) to 4 mm. In this way, the sleeve 130 can be adjusted to be trapped on the outside of the sampling tube 110. One end of the sampling tube 110 is connected to the sampling head 120, and the periphery of the sampling tube 120 is provided with a high temperature resistant and flexible covering layer. The movable buckle 140 is arranged on the sleeve 130, and is used to press against the outer wall of the vehicle exhaust pipe 200 when the sampling head 120 is extended into the vehicle exhaust pipe 200, so as to fix the sampling head 120 inside the exhaust pipe 200; the sampling head 120 is used to collect exhaust gas discharged by the vehicle.

[0032] For example, when conducting a vehicle exhaust pollutant emission test, the exhaust gas sampling device 100 first needs to be installed on the vehicle exhaust pipe 200 to collect the exhaust gas emitted by the vehicle. Specifically, one end of the sampling tube 110 (i.e., the end provided with the sampling head 120) needs to be connected to the vehicle exhaust pipe 120, and the other end of the sampling tube 110 needs to be connected to the pollutant emission detection equipment to guide the vehicle exhaust gas to the pollutant emission detection equipment for detection. It is understandable that when the exhaust gas sampling device 100 is in the sampling working state, the sampling head 120 (also including a part of the sampling tube 110) needs to be fixed inside the vehicle exhaust pipe 200 for a long time. In the embodiment of the present disclosure, the movable buckle 140 is used to achieve the fixation between the sampling head 120 and the vehicle exhaust pipe 200. As Figure 1 As shown, the movable buckle 140 can be a U-shaped buckle, one end of which is connected to the sleeve 130, and the vertical distance between the other end of the U-shaped buckle and the sampling tube 120 is adjustable. During the actual installation of the exhaust gas sampling device 100, the vertical distance between the movable buckle 140 and the sampling tube 120 can be increased first, and after the sampling head 120 and the sampling tube 110 are inserted into the vehicle exhaust pipe 200, the vertical distance between the movable buckle 140 and the sampling tube 120 can be reduced until it is pressed against the outer wall of the vehicle exhaust pipe 200. At this time, the sampling tube 120 also presses against the inner wall of the vehicle exhaust pipe 200 at the same time, so that the sampling head 120 can be fixed inside the vehicle exhaust pipe 200. In addition, when fixed inside the vehicle exhaust pipe 200, the distance between the sampling head 120 and the pipe opening of the vehicle exhaust pipe 200 can be adjusted in the range of 0 cm (centimeter) to 30 cm, or in other words, the maximum distance that the sampling head 120 can extend into the vehicle exhaust pipe 200 is 30 cm.

[0033] In summary, the exhaust gas sampling device provided in the embodiment of the present disclosure can be fixed on the exhaust pipe of a vehicle, and has a simple fixing structure and is easy to install and disassemble.

[0034] Figure 2is according to Figure 1 which is a schematic structural diagram of an exhaust gas sampling device shown, as Figure 2 shown, the exhaust gas sampling device 100 further includes: a spiral buckle 150, one end of the spiral buckle 150 is located outside the sleeve 130, and the other end of the spiral buckle 150 passes through an opening on the sleeve 130 and abuts against the sampling tube 110 to fix the relative positions of the sleeve 130 and the sampling tube 110.

[0035] Exemplarily, the spiral buckle 150 can be a screw rod, and threads corresponding to the threads of the spiral buckle 150 are provided in the opening on the sleeve 130. A nut that can be manually rotated is provided at one end (or the tail end) of the spiral buckle 150. By rotating the nut at the tail end of the spiral buckle 150, the other end (or the front end) of the spiral buckle 150 extends into the interior of the sleeve 130 and abuts the sampling tube 110 against a position on the inner wall of the sleeve 130 opposite to the above-mentioned opening, so as to achieve the fixation between the sleeve 130 and the sampling tube 110. On the other hand, in the case where the relative positions of the sleeve 130 and the sampling tube 110 need to be changed, the front end of the spiral buckle 150 can be withdrawn from the interior of the sleeve 130 by rotating the nut at the tail end of the spiral buckle 150 to release the sampling tube 110, so as to achieve the adjustment of the relative positions between the sleeve 130 and the sampling tube 110.

[0036] As Figure 2 shown, in a possible implementation manner, the movable buckle 140 includes: a movable grip 141, a vertical grip 142, and an elastic member 143. The vertical grip 142 is vertically fixed on the sleeve 130. One end of the movable grip 141 is rotatably connected to the vertical grip 142. In this case, one end of the movable grip 141 can rotate within a certain range with the fixed point on the vertical grip 142 as the center. In addition, the other end of the movable grip 141 is connected to the vertical grip 142 through the elastic member 143. An L-shaped fixing member 144 is also provided on the movable grip 141, and the L-shaped fixing member 144 is used to abut against the outer wall of the exhaust pipe 200 to fix the sampling tube 110 and the exhaust pipe 200. Among them, the elastic member 143 can be a metal spring.

[0037] Exemplarily, during the installation of the exhaust gas sampling device 100, an operator can place the palm against the vertical grip 142 and squeeze the movable grip 141 with fingers to increase the distance between the L-shaped fixing member 144 and the sampling tube 110. At this time, the sampling port 121 (and the support member 122) can be inserted into the vehicle exhaust pipe 200. When the distance that the sampling port extends into the vehicle exhaust pipe 200 reaches a preset distance, the operator's hand releases the movable grip 141, so that the L-shaped fixing member 144 abuts against the outer wall of the exhaust pipe 200 under the elastic force of the elastic member 143. In this way, the sampling head 120 is fixed inside the exhaust pipe 200.

[0038] Exemplarily, when being fixed inside the vehicle exhaust pipe, the sampling head and the sampling tube 110 are preferably fixed at the central position of the entire vehicle exhaust pipe. Or rather, when being fixed inside the vehicle exhaust pipe, the vertical distance from each point on the outer wall of the sampling tube 110 to the outer wall of the vehicle exhaust pipe 200 is the same. Based on this, the sampling head includes: a sampling port 121 and a support member 122; wherein, the sampling port 121 passes through the center of the support member 122. When the sampling head is fixed inside the exhaust pipe 200, the center of the support member 122 is on the axis of the cylindrical exhaust pipe 200. The difference between the diameter of the support member 122 and the inner diameter of the exhaust pipe 200 is less than a preset value, which is used to support the sampling port 121 and the sampling tube 120. It should be noted that in the embodiments of the present disclosure, the support member 122 is set to have the same shape as the cross-section of the vehicle exhaust pipe 200. For example, if the vehicle exhaust pipe 200 is cylindrical, then the support member 122 is a circular support sheet, and the above-mentioned center is the center of the circular support member. Based on this, when the cross-section of the vehicle exhaust pipe 200 is of other shapes (such as rectangle, trapezoid, irregular polygon, etc.), the support member can also be set to other shapes corresponding to the cross-section of the vehicle exhaust pipe 200, and the above-mentioned center is the geometric center of these shapes.

[0039] In a possible implementation manner, when measuring the particulate matter concentration in the vehicle exhaust gas, it is not necessary to completely collect the exhaust gas discharged from the vehicle. To ensure that the uncollected part of the vehicle exhaust gas can be naturally discharged, ventilation gaps are provided on the support member 122. In a possible implementation manner, the image support member 122 can be a circular iron sheet, and the ventilation gaps are openings on the circular iron sheet.

[0040] Figure 3 is according to Figure 2 shown in a schematic structural diagram of a sampling head of a sampling tube, as Figure 3As shown, in a possible implementation, in order to ensure as much as possible that the uncollected part of the vehicle exhaust can be naturally discharged, the support member 122 may include: an outer ring 1221, an inner ring 1222, and a plurality of spokes 1223. The inner ring 1222 is sleeved on the sampling port 121. One end of each spoke 1223 is fixed to the outer wall of the inner ring 1222, and the other end of each spoke 1223 is fixed to the inner side of the outer ring 1221. The gap between every two spokes 1223 is the above-mentioned ventilation gap.

[0041] Exemplarily, a protective layer 1224 is attached to the edge of the outer ring 1221 to prevent the support member 122 from damaging the inner wall of the vehicle exhaust pipe when the sampling head is inside the vehicle exhaust pipe. The protective layer 1224 is made of high-temperature resistant materials such as ceramics and soft metals.

[0042] Figure 4 is a schematic structural diagram of an adjustable support member in an extended state shown according to an exemplary embodiment, as Figure 4 As shown, in another possible implementation, the support member 122 is an adjustable support member, and the adjustable support member includes: a metal hose 1225 and an adjustment member 1226; wherein, both the metal hose 1225 and the adjustment member 1226 are sleeved on the sampling tube 130. The front end of the metal hose 1225 is fixed at the sampling port 121, the rear end of the metal hose 1225 is connected to the front end of the adjustment member 1226, and the adjustment member 1226 is used to shorten the relative position between the rear end of the metal hose 1225 and the sampling port 121, so that the metal hose 1225 bulges and abuts against the inner wall of the exhaust pipe. The metal hose 1225 is a mesh metal hose, and the mesh holes on the mesh metal hose are the above-mentioned ventilation gaps.

[0043] Exemplarily, the adjustment member 1226 includes a metal straight pipe and a fixing portion; wherein, the fixing portion is a protrusion provided at the rear end of the metal straight pipe for fixing the relative position between the metal straight pipe and the sampling tube 130. Two grooves 1227 and 1228 are provided on the sampling tube 130 corresponding to the fixing portion. Among them, the groove 1227 is closer to the sampling port 121, and the groove 1228 is farther from the sampling port 121.

[0044] Figure 5 is according to Figure 4 shown is a schematic structural diagram of an adjustable to a common state in a bulging state, as Figure 5As shown, in actual operation, the sampling tube can be fixed to the exhaust pipe by the sleeve and the buckle, and then the installer can push the metal straight tube forward by hand until the fixing part moves from the groove 1227 to the groove 1228. In this case, the metal hose 1225 bulges according to the pre-made folds and presses against the inner wall of the exhaust pipe so that the sampling port 121 is at the center of the exhaust pipe cross section. It can be understood that the number of folds set on the metal hose 1225 can be one or more, Figure 5 The metal hose 1225 is provided with a plurality of folds as an example for description.

[0045] It should be noted that in the embodiment of the present disclosure, the support member 122 is described by taking the example of two grooves provided on the sampling tube. In another possible embodiment, a plurality of grooves may be provided on the sampling tube, for example, at least one intermediate groove may be provided between the two grooves 1227 and 1228. When the fixing portion is stuck in the groove 1228, the support member 122 is in an extended state, and when the fixing portion is stuck in the groove 1227 or any intermediate groove, the support member 122 is in a bulging state. It can be understood that the diameter of the bulge formed by the fixing portion being stuck in any intermediate groove is smaller than the diameter of the bulge formed by the fixing portion being stuck in the groove 1227. In this way, in the case where the sampling tube can be provided with a plurality of grooves, the fixing portion can be stuck in an appropriate groove to adapt to vehicle exhaust pipes of different inner diameters, thereby improving the scope of application of the exhaust gas sampling device.

[0046] In summary, the exhaust gas sampling device provided in the embodiments of the present disclosure can fix the sampling tube and the sampling head at the axial position of the vehicle exhaust pipe while ensuring that the uncollected vehicle exhaust gas is discharged naturally, and the fixing structure is simple and easy to install and disassemble.

[0047] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

Claims

1. An exhaust gas sampling device, characterized in that, Including: A sampling tube, a sampling head, a sleeve, and a movable buckle; wherein, The sleeve is adjustably sleeved outside the sampling tube, one end of the sampling tube is communicated with the sampling head, and the movable buckle is arranged on the sleeve; The movable buckle is used for tightly pressing against the outer wall of the exhaust pipe when the exhaust gas sampling device is in the sampling working state, so as to fix the sampling head inside the exhaust pipe; The sampling head is used for collecting the exhaust gas discharged by the vehicle; The sampling head includes: a sampling port and a support member; Wherein, the sampling port passes through the center of the support member. When the sampling head is fixed inside the exhaust pipe, the center of the support member is on the axis of the exhaust pipe, and the difference between the projected area of the support member on the target plane and the cross-sectional area of the exhaust pipe is less than a preset value, and the target plane is the cross-section of the exhaust pipe; There is a ventilation gap provided on the support member; The support member is an adjustable support member, and the adjustable support member includes: a metal hose and an adjusting component; Wherein, both the metal hose and the adjusting component are sleeved on the sampling tube, the front end of the metal hose is fixed at the sampling port, the rear end of the metal hose is connected to the front end of the adjusting component, and the adjusting component is used to shorten the relative position between the rear end of the metal hose and the sampling port, so that the metal hose bulges and abuts against the inner wall of the exhaust pipe; The adjusting component includes a metal straight pipe and a fixing part; wherein, The fixing part is arranged on the metal straight pipe and is used for fixing the relative position between the metal straight pipe and the sampling tube; The fixing part corresponds to a first groove and a second groove arranged on the sampling tube, and the distance between the first groove and the sampling port is less than the distance between the second groove and the sampling port; At least one intermediate groove is arranged between the first groove and the second groove; when the fixing part is stuck in the second groove, the support member is in an extended state, and when the fixing part is stuck in the first groove or any one of the intermediate grooves, the support member is in a bulging state; the diameter of the bulge formed when the fixing part is stuck in any one of the intermediate grooves is smaller than the diameter of the bulge formed when the fixing part is stuck in the first groove.

2. The exhaust gas sampling device according to claim 1, wherein, The support member is a fixed support member, and the fixed support member includes: an outer ring, an inner ring, and a plurality of spokes. The inner ring is sleeved on the sampling port, one end of each spoke is fixed to the outside of the inner ring, one end of each spoke is fixed to the inside of the outer ring, and the gap between every two spokes is the ventilation gap.

3. The exhaust gas sampling device according to claim 1, characterized in that, The metal hose is a mesh metal hose, and the mesh holes on the mesh metal hose are the ventilation gaps.

4. The exhaust gas sampling device according to claim 1, characterized in that, The exhaust gas sampling device further includes: a spiral buckle. One end of the spiral buckle is located outside the sleeve, and the other end of the spiral buckle passes through the opening on the sleeve and tightly presses against the sampling tube to fix the relative position between the sleeve and the sampling tube.

5. The exhaust gas sampling device according to claim 1, characterized in that, The movable buckle includes: a movable grip, a vertical grip, and an elastic member. The vertical grip is vertically fixed on the sleeve. One end of the movable grip is rotatably connected to the vertical grip, and the other end of the movable grip is connected to the vertical grip through the elastic member. An L-shaped fixing member is provided on the movable grip, and the L-shaped fixing member is used to press against the outer wall of the exhaust pipe to fix the sampling pipe and the exhaust pipe.

6. The exhaust gas sampling device according to claim 5, characterized in that, The elastic member is a spring.

7. The exhaust gas sampling device according to any one of claims 1-6, characterized in that When fixed inside the vehicle exhaust pipe, the adjustment range of the distance between the sampling head and the pipe orifice of the exhaust pipe is from 0 cm to 30 cm.

Images