Gas sensor manifold
The gas sensor collector addresses gas collection inefficiencies by using a beveled inlet and dihedral divider to enhance gas flow and distribution, ensuring accurate measurements.
Patent Information
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- FAURECIA SYST DECHAPPEMENT SAS
- Filing Date
- 2022-12-14
- Publication Date
- 2026-06-12
Smart Images
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Abstract
Description
Title of the invention: Gas sensor manifold technical field
[0001] The invention relates to a collector for a gas sensor. Previous technique
[0002] The invention relates to a gas sensor. Such a sensor is typically installed in an exhaust line.
[0003] For this purpose such a sensor includes a collector suitable for collecting the gas to transport it to a sensitive element of the gas sensor suitable for analyzing said gas in order, typically, to measure a content of a component of the exhaust gases, for example the quantity of NH3 or NOx.
[0004] It is known in the prior art to make such a manifold from a hollow cylindrical tube. This tube is disposed in an exhaust pipe, substantially radially, and perpendicular to the axis of the pipe. One end of said tube, called the proximal end, is integral with the wall of the exhaust line pipe. The other end, called the distal end, is substantially in the center of the pipe. The tube is plugged at the distal end. It includes a gas inlet orifice, located near the distal end, and a gas outlet orifice, located on the opposite wall of the tube and near the proximal end. A sensing element, capable of performing gas analysis, is disposed between the inlet orifice and the outlet orifice.
[0005] However, such an embodiment has the disadvantage that too little gas is collected through the inlet orifice and that the measurement may be distorted by lack of gas at the sensitive element. Summary of the invention
[0006] Also, another design of the collector was sought to allow more gas to be collected and transported to the sensitive element.
[0007] For this purpose the invention relates to a collector for a gas sensor, comprising a body of substantially hollow cylindrical shape, along a first axis substantially perpendicular to a second axis of the gas flow, and comprising a gas inlet mouth, formed by cutting the distal end of the body substantially by a first plane parallel to a third axis perpendicular to the first axis and the second axis, the mouth opening facing the gas flow.
[0008] Specific features or embodiments, usable alone or in combination, are:
[0009] - the first plane has, relative to the first axis, an angle between 10 and 80°, preferably equal to 30°,
[0010] - the body further comprises, at its distal end, opposite the mouth, a divider capable of dividing the gas flow into two half-flows, swirling in opposite directions,
[0011] - the divisor is substantially dihedral, with an edge contained in a second plane passing through the first axis and the second axis, the dihedral angle being preferentially symmetrical with respect to the second plane,
[0012] - the dividing line is either inward or outward, relative to the body,
[0013] - the divider is made by embossing the body,
[0014] - the manifold further includes a gas outlet orifice, disposed in the body in its wall opposite the mouth, at the level of the proximal end of the body.
[0015] The invention further relates to a gas sensor comprising a sensitive element and such a collector, where the sensitive element is disposed in the body, between the mouth and the orifice.
[0016] The invention further relates to an exhaust line comprising such a gas sensor.
[0017] Specific features or embodiments, usable alone or in combination, are:
[0018] - the proximal end 7 is located in the wall of the escape line and the length the body of the collector is such that the mouth is located approximately in the center of the exhaust line. Brief description of the drawings
[0019] The invention will be better understood upon reading the following description, given solely by way of example, and with reference to the figures in the appendix in which:
[0020] [Fig-1] shows, in perspective view, a collector seen from the mouth side,
[0021] [Fig.2] shows, in cross-sectional view along a sagittal plane, the collector of the [Fig.1],
[0022] [Fig.3] shows, in sectional view, a first embodiment, with a divider returning,
[0023] [Fig.4] shows, in sectional view, another embodiment, with an outgoing divider,
[0024] [Fig.5] shows, in top view, the collector of the [Fig.1]. Description of the implementation methods
[0025] With reference to Figures 1, 2 and 5, the invention relates to a manifold 1 for a gas sensor. This manifold 1 comprises a body 2 of substantially cylindrical hollow shape. Said cylinder has as its axis a first axis A.
[0026] When installed in the exhaust line pipe 10, the manifold 1 is arranged so that the axis A of the cylinder is substantially perpendicular to an axis B of the gas flow, which is called the second axis B. This second axis B coincides with the axis B of the exhaust line pipe 10 containing the collector 1.
[0027] According to one feature, the manifold 1 includes a gas inlet 3. This inlet 3 has a large cross-section relative to the prior art. It is formed by cutting the distal end 6 of the body 2 substantially with a first plane PI. This first plane PI is defined as a plane parallel to a third axis perpendicular to the first axis A and the second axis B. The plane PI intersects the first axis A so as to cut the body 2 at an angle. Furthermore, the plane PI is symmetrically arranged with respect to the second axis B of the gas flow F. The plane PI is inclined so as to form a beveled inlet 3. Moreover, the plane PI is oriented so that this inlet 3 opens facing the gas flow F.
[0028] According to another feature, the first plane PI has, relative to the first axis A, an angle a. This angle a is between 10 and 80°.
[0029] This angle is preferably less than 45°. Thus, the opening 3 has a large cross-section, projected onto a plane perpendicular to the gas flow F, and advantageously greater than the cross-section of the body 2. Therefore, the gas collected by said opening 3 is sufficient to fill the internal volume of the cylinder of body 2, which has a smaller cross-section. The angle α is preferably equal to 30°.
[0030] According to another feature, the body 2 further comprises, at its distal end 6, opposite the mouth 3, on the wall opposite the opening of the mouth 3, a divider 4. This divider 4 is capable of dividing the gas flow F into two half-flows.
[0031] Moreover, due to the shape of the dividing head 4, the two half-flows swirl in opposite directions.
[0032] This swirling advantageously allows the gas to be stirred before it reaches the sensitive element 8 in charge of the measurement.
[0033] This swirling further compresses the gas and thus advantageously increases the flow rate of gas circulating in the collector 1 and reaching the sensitive element 8 and the filling of the collector 1.
[0034] According to another feature, the dividing element 4 is substantially dihedral. The edge of the dihedral is contained in a second sagittal plane P2. The second plane P2 passes through the first axis A and the second axis B. The dihedral is preferentially symmetric with respect to the second sagittal plane P2.
[0035] Figures 3 and 4 represent sections of the collector 1 along a plane perpendicular to the first axis A.
[0036] According to another feature, the dihedral angle of the divider 4 is re-entrant relative to the body 2. This is illustrated in Figures 1, 2 and in the section of [Fig. 3]. The swirling half-flows of gas G, in opposite directions, are thus obtained.
[0037] Alternatively, the dihedral angle of the divider 4 is outward relative to the body 2. This is illustrated in section [Fig. 4]. The swirling gas half-flows G, in the direction The opposites are thus obtained.
[0038] The divider 4 can be made by any means. According to a first characteristic, it is made by a part, for example forged, attached to the inner wall of the body 2.
[0039] According to another, preferred feature, the divider 4 is made by embossing the body 2. Thus, the divider 4 is obtained from the same material as the body 2. This simplifies the making of the collector 1 which remains inexpensive to produce.
[0040] The gas enters the manifold 1 through the opening 3. In order for the gas to exit, according to another feature, the manifold 1 further includes a gas outlet orifice 5. This outlet 5 is located in the body 2 in its wall opposite the opening 3, preferably at the proximal end 7 of the body 2.
[0041] Said orifice 5 preferably has a cross-section smaller than the cross-section of the mouth 3 and even more preferably a cross-section smaller than the cross-section of the body 2 in order to create an overpressure in the manifold 1. Such an overpressure ensures that the manifold 1 is permanently filled with gas in order to supply the sensitive element 8.
[0042] Said orifice 5 can be of any shape, advantageously circular, in order to simplify its manufacture.
[0043] The invention further relates to a gas sensor. Such a gas sensor comprises a sensitive element 8. This sensitive element 8 is capable of effectively performing the measurement(s) on the gas passing in its vicinity. According to one feature, the gas sensor further comprises a manifold 1 according to any one of the embodiments described above. Advantageously, the sensitive element 8 is disposed in the body 2, between the inlet 3 and the orifice 5. Thus, the sensitive element 8 sees the flow of gas diverted from the main flow of gas circulating in the pipe 10 by the manifold 1 and flowing from the inlet 3 to the orifice 5.
[0044] The invention further relates to an exhaust line comprising such a gas sensor.
[0045] According to another feature, the exhaust line comprises a pipe 10. The proximal end 7 of the manifold 1 of the gas sensor is located on the wall of the pipe 10 of the exhaust line. Furthermore, the length of the body 2 of the manifold 1 is advantageously such that the inlet 3 is located substantially in the center of the pipe 10 of the exhaust line.
[0046] The invention has been illustrated and described in detail in the drawings and the preceding description. This description is to be considered illustrative and given by way of example and not as limiting the invention to this single description. Numerous embodiments are possible. List of reference signs
[0047] 1: collector,
[0048] 2: body,
[0049] 3: entrance opening,
[0050] 4: divisor,
[0051] 5: outlet orifice,
[0052] 6: distal end,
[0053] 7: proximal end,
[0054] 8: sensitive element,
[0055] 10: pipeline,
[0056] A: collector shaft,
[0057] B: axis of the pipeline / gas flow,
[0058] F: direction of gas flow,
[0059] PI: mouth definition plane,
[0060] P2: sagittal plane.
Claims
Demands
1. A gas collector (1) comprising a body (2) of substantially hollow cylindrical shape, along a first axis (A) substantially perpendicular to a second axis (B) of the gas flow, and comprising a gas inlet mouth (3) and a gas outlet orifice (5), the mouth (3) being formed by cutting the distal end (6) of the body (2) substantially by a first plane (PI) parallel to a third axis perpendicular to the first axis (A) and to the second axis (B), the mouth (3) opening facing the gas flow (F), characterized in that the body (2) further comprises, at its distal end (6), opposite the mouth (3), a divider (4) capable of dividing the gas flow (F) into two half-flows, swirling in opposite directions.
2. Collector (1) according to claim 1, wherein the first plane (PI) has, relative to the first axis (A) an angle (a) between 10 and 80°, preferably equal to 30°.
3. Collector (1) according to any one of claims 1 or 2, wherein the divider (4) is substantially dihedral, with edge included in a second plane (P2) passing through the first axis (A) and the second axis (B), the dihedral being preferably symmetric with respect to the second plane (P2).
4. Collector (1) according to any one of claims 1 to 3, wherein the divider (4) is re-entrant or re-existing, relative to the body (2).
5. Collector (1) according to any one of claims 1 to 4, wherein the divider (4) is made by embossing the body (2).
6. Manifold (1) according to any one of claims 1 to 5, wherein the gas outlet orifice (5) is disposed in the body (2) in its wall opposite the mouth (3), at the level of the proximal end (7) of the body (2).
7. Gas sensor comprising a sensitive element (8) characterized in that it further comprises a collector (1) according to any one of the preceding claims, wherein the sensitive element (8) is disposed in the body (2), between the mouth (3) and the orifice (5).
8. Exhaust line characterized in that it comprises a gas sensor according to the preceding claim.
9. Exhaust line according to the preceding claim, wherein the proximal end (7) is located in the wall of the exhaust line and wherein the length of the body (2) of the manifold (1) is such that the outlet (3) is located roughly in the center of the exhaust line.