Rectifying tube and rectifying grating
By designing a grid hole group with gradually increasing aperture and a grid hole group with gradually decreasing density on the rectifier grid of the rectifier tube, the problems of uneven gas distribution and flow separation are solved, and the measurement accuracy of the air flow sensor is improved .
Patent Information
- Application Number
- CN202420972278.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-07
AI Technical Summary
The rectifier grille of existing rectifier pipes fails to effectively consider the distribution of flowing gas inside the pipeline, resulting in uneven distribution of gas and separation of flow, affecting the measurement accuracy of the air flow sensor.
Design a rectifier grille, with multiple sets of grid hole groups in the radial direction, each set of grid hole groups including multiple circles of grid holes arranged around the center, the aperture gradually increases, and the setting density gradually decreases , the pores near the center are small and dense, and the pores far away from the center are large and sparse to uniformize the gas flow rate.
By uniformizing the gas flow rate, the gas flow is stabilized, the measurement accuracy of the air flow sensor is improved, and the occurrence of flow separation is avoided.
Smart Images
Figure CN222363223U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of engine technology, and in particular to a rectifier tube and a rectifier grid. Background Art
[0002] The air flow sensor takes away different amounts of heat according to the different flows of gas passing through the sensor, generating a temperature gradient on the sensor chip, and converting the temperature gradient into a digital signal (frequency) through the internal circuit and sending it to the electronic control unit (ECU). By calibrating the characteristic curve of frequency and flow, the corresponding intake flow value is obtained according to the output frequency signal. The air flow sensor is used with a rectifier tube, which plays a role in blocking and stabilizing the flow, making the air flow sensor's measurement more accurate.
[0003] like Figure 1 As shown, the air inlet end of the rectifier tube 01 is provided with a rectifier grid 02, which is used to rectify the air entering the rectifier tube 01. The rectifier tube 01 is provided with an air flow sensor 03, which is close to the air outlet end of the rectifier tube 01. Figure 2 As shown, the grid holes of the rectifier grid 02 are uniformly distributed square holes. According to CFD simulation calculations, the air mass flow rate on the cross section perpendicular to the axial direction of the rectifier tube 01 gradually decreases from the center of the rectifier tube 01 to the tube wall of the rectifier tube, that is, the gas mass flow rate at the center of the rectifier tube 01 is the largest.
[0004] The rectifier grid 02 of the rectifier tube 01 in the prior art does not take into account the distribution of the flowing gas inside the pipeline, such as Figure 3 As shown, before the air enters the rectifying grid 02, the air has a large flow rate in the middle. After passing through the rectifying grid 02, Figure 4 As shown, the gas distribution is still uneven, and after flowing for a certain distance in the rectifier tube 01, flow separation will occur, affecting the accuracy of the air flow sensor 03 measurement.
[0005] Therefore, how to improve the measurement accuracy of the air flow sensor has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content
[0006] The present application proposes a rectifying grid to improve the measurement accuracy of an air flow sensor. The present application also proposes a rectifying tube.
[0007] In order to achieve the above object, the present application provides a rectifying grid, comprising a grid body, a plurality of grid hole groups are arranged along the radial direction of the grid body, each of the grid hole groups comprises a plurality of circles of grid holes arranged around the center of the grid body,
[0008] The apertures of the grille holes of the grille hole group gradually increase from the center of the grille body to the periphery of the grille body, and the arrangement density of the grille holes of the grille hole group gradually decreases from the center of the grille body to the periphery of the grille body.
[0009] Preferably, in the above-mentioned rectifying grid, the grid holes of each group of the grid holes have the same aperture along the radial direction of the grid body.
[0010] Preferably, in the above-mentioned rectifying grid, the arrangement density of the grid holes of each group of the grid holes along the radial direction of the grid body is equal.
[0011] Preferably, in the above-mentioned rectifying grid, the apertures of the grid holes of the grid hole group gradually increase along the radial direction of the grid body.
[0012] Preferably, in the above-mentioned rectifying grid, the grid hole groups located at different positions in the radial direction of the grid body have the same or different setting widths.
[0013] Preferably, in the above-mentioned rectifying grid, the shapes of the grid holes of the grid hole groups located at different positions in the radial direction of the grid body are the same or different.
[0014] Preferably, in the above-mentioned rectifying grid, the shapes of the grid holes of the grid hole groups located at different positions in the radial direction of the grid body are the same or different.
[0015] Preferably, in the above-mentioned rectifying grid, the grid holes are square holes or round holes.
[0016] Preferably, in the above-mentioned rectifying grid, a central grid hole is arranged at the center of the grid body, and the aperture of the central grid hole is smaller than or equal to the aperture of the grid holes of the grid hole group adjacent to the central grid hole.
[0017] A rectifier tube comprises a tube body and a rectifier grid, wherein the rectifier grid is arranged at the air inlet end of the tube body, and the rectifier grid is the rectifier grid described in any one of the above schemes.
[0018] The tube body is a straight tube.
[0019] The rectifying grid provided by the embodiment of the present application comprises a grid body, and a plurality of grid hole groups are arranged on the grid body along the radial direction of the grid body, and each grid hole group comprises a plurality of circles of grid holes arranged around the center of the grid body, and the arrangement density of the grid holes of the grid hole group from the center of the grid body to the periphery of the grid body gradually decreases, and the arrangement density of the grid holes of the grid hole group from the center of the grid body to the periphery of the grid body gradually decreases. The gas flows through the grid holes with small and dense apertures arranged near the center of the grid body, which greatly reduces the flow rate of the gas flowing through the center of the grid body, and the gas flows through the grid holes with large and sparse apertures arranged away from the center of the grid body, which slightly reduces the flow rate of the gas flowing through the center of the grid body, thereby making the flow rate of the gas flowing through the grid body uniform. After adopting the rectifying grid disclosed in the present application, the gas flow state in the rectifying tube is more stable, which is conducive to improving the measurement accuracy of the air flow sensor.
[0020] The present application also discloses a rectifier tube, comprising a tube body and a rectifier grid, wherein the rectifier grid is arranged at the air inlet end of the tube body, and the rectifier grid is the rectifier grid recorded in any one of the above schemes. Since the rectifier grid has the above technical effects, the rectifier tube having the rectifier grid also has the same technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.
[0022] Figure 1 It is a structural schematic diagram of a rectifier tube in the prior art;
[0023] Figure 2 It is a structural schematic diagram of a rectifier grid in the prior art;
[0024] Figure 3 It is a distribution cloud diagram of the mass flow of gas in the rectifier tube before the gas passes through the rectifier grid in the prior art;
[0025] Figure 4 It is the gas velocity flow field diagram of the axial section of the rectifier tube obtained by simulation in the prior art;
[0026] Figure 5 It is a structural schematic diagram of the rectifying grid of the present application;
[0027] Figure 6 This is the axial cross-sectional gas velocity flow field diagram of the rectifier tube obtained through simulation in this application.
[0028] The accompanying drawings are as follows:
[0029] 01-rectifier tube; 02-rectifier grille; 03-air flow sensor;
[0030] 1-Grille body; 2-Grille hole. DETAILED DESCRIPTION
[0031] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. The described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.
[0032] It should be noted that, for ease of description, only the parts related to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features.
[0033] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.
[0034] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.
[0035] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.
[0036] See also Figure 1-Figure 6 .
[0037] The rectifier grid is arranged at the air inlet end of the rectifier tube, and the shape of the rectifier grid is the same as the cross-sectional shape of the rectifier tube. The rectifier tube is generally a round tube, and accordingly, the rectifier grid is a circular plate structure, and the grid holes 2 of the rectifier grid are opened along a plane perpendicular to the rectifier grid.
[0038] Since the gas flows in laminar flow in the rectifier tube, and the gas itself has viscosity, and there is friction resistance between the gas close to the tube wall and the rectifier tube, the gas flow rate close to the tube wall is the slowest, and the gas flow rate close to the center of the tube wall is the fastest, resulting in uneven distribution of gas pressure, mass and velocity on the circumferential surface. The grid holes of the traditional rectifier grid are evenly distributed on the rectifier grid, which cannot achieve an effective rectification effect on the gas, resulting in different gas pressure distribution gradients after passing through the rectifier grid, resulting in eddy currents in the rectifier tube.
[0039] Some embodiments of the present application disclose a rectifying grid, comprising a grid body 1, wherein a plurality of groups of grid hole groups are arranged on the grid body 1 along the radial direction of the grid body 1, each group of grid hole groups comprises a plurality of circles of grid holes 2 arranged around the center of the grid body 1, the apertures of the grid holes 2 of the grid hole groups gradually increase from the center of the grid body 1 to the periphery of the grid body 1, and the arrangement density of the grid holes 2 of the grid hole groups gradually decreases from the center of the grid body 1 to the periphery of the grid body 1.
[0040] It should be noted that the periphery of the grid body 1 is the outer edge of the grid body, the center of the grid body 1 is the center of the circular plate-shaped rectifying grid, and the radial direction of the rectifying grid is the extension direction of the radius of the circular plate-shaped rectifying grid.
[0041] The rectifying grid disclosed in the present application is provided with multiple grid hole groups. Specifically, the grid holes 2 of the grid hole group close to the center of the grid body 1 have a smaller aperture than the grid holes 2 of the grid hole group far from the center of the grid body 1, and the grid holes 2 of the grid hole group close to the center of the grid body 1 have a greater density than the grid holes 2 of the grid hole group far from the center of the grid body 1. Figure 3 and Figure 4 Before the gas passes through the rectifier grid, the gas is concentrated near the center of the rectifier tube and gradually decreases toward the tube wall of the rectifier tube. In this solution, the arrangement of the grid holes 2 on the grid body 1 corresponds to the change of the gas in the rectifier tube. Specifically, Figure 5As shown, the holes of the grille holes 2 close to the center of the grille body 1 are not only small but also arranged relatively densely, while the holes of the grille holes 2 far from the center of the grille body 1 are not only small but also arranged relatively sparsely.
[0042] The gas flows through the small and dense grid holes 2 arranged near the center of the grid body 1, and the resistance is large, so that the flow rate of the gas flowing through the center of the grid body 1 is greatly reduced. The gas flows through the large and sparse grid holes 2 arranged far from the center of the grid body 1, and the resistance is small, so that the flow rate of the gas flowing through the center of the grid body 1 is slightly reduced, so that the flow rate of the gas flowing through the grid body 1 is uniform. Figure 6 As shown, the gas flow state in the rectifier tube after adopting the rectifier grid disclosed in the present application is more stable, which is beneficial to improving the measurement accuracy of the air flow sensor.
[0043] The arrangement density of the grille holes 2 of the grille hole group is the number of grille holes 2 arranged per unit area of the grille body 1. The more grille holes 2 are arranged per unit area, the greater the density of the grille holes 2 is, and the fewer grille holes 2 are arranged per unit area, the smaller the density of the grille holes 2 is. The arrangement density of the grille holes 2 of the grille hole group of the grille body 1 is designed according to the mass flow of the gas before passing through the rectifying grille, so that the gas is evenly distributed after passing through the rectifying grille, and the flow separation state is avoided downstream of the rectifying grille.
[0044] The apertures of the grille holes 2 of each grille hole group may be the same or different.
[0045] Since the mass flow of the gas is distributed in layers along the radial direction of the rectifying path in the rectifying tube, if there are multiple changes in the mass flow of the gas in a certain area in the radial direction of the rectifying tube, the apertures of the grid holes of the grid hole group corresponding to the area can be different; if the changes in the mass flow of the gas in a certain area in the radial direction of the rectifying tube are not obvious, the apertures of the grid holes of the grid hole group corresponding to the area can be the same.
[0046] In the embodiment where the apertures of the grille holes 2 of each grille hole group are not equal, the apertures of the grille holes 2 of the grille hole group gradually increase along the radial direction of the grille body 1. It should be noted here that the aperture of the outermost grille holes of the grille hole group close to the center of the grille body 1 is smaller than the aperture of the innermost grille holes of the grille hole group adjacent to the grille hole group and far from the center of the grille body 1.
[0047] In an embodiment where the apertures of the grille holes 2 of each grille hole group are equal, the arrangement density of the grille holes 2 of each grille hole group along the radial direction of the grille body 1 can be equal. Since the mass flow of the gas is distributed in the pipeline in the radial direction of the pipeline, but the mass flow of the gas in each region also has slight changes along the radial direction of the pipeline, in order to further improve the rectification effect, the arrangement density of the grille holes 2 of each grille hole group along the radial direction of the grille body 1 is gradually reduced, and the aperture of the grille holes 2 of each grille hole group is gradually reduced along the radial direction of the grille body 1, so as to adjust the flow rate of the gas passing through each grille hole group, so as to further improve the stability of the gas flow in the rectifier tube, which is conducive to improving the measurement accuracy of the air flow sensor. The shapes of the grille holes 2 of the grille hole groups located at different positions in the radial direction of the grille body 1 are the same or different.
[0048] In the embodiment where the shapes of the grille holes 2 of the plurality of grille hole groups are different, the shapes of the grille holes 2 of each grille hole group may be the same or different.
[0049] Preferably, the shapes of the grille holes in each circle of grille holes 2 are the same.
[0050] The grille holes 2 are preferably circular holes, but are not limited to circular holes and may also be holes of other shapes.
[0051] The grid hole groups at different positions in the radial direction of the grid body 1 may have the same or different widths. The grid hole group width is the size of the grid hole group along the radial direction of the grid body 1. The width of the grid hole group is determined according to the distribution of the gas flow in the rectifier tube. Figure 5 1 is an embodiment in which the widths of the grille hole groups located at different positions in the radial direction of the grille body 1 are set to be the same.
[0052] Specifically, a central grille hole is provided at the center of the grille body 1 , and the aperture of the central grille hole is smaller than or equal to the aperture of the grille hole 2 of the grille hole group adjacent to the central grille hole.
[0053] The central grid hole can guide the gas passing through the center of the grid body 1 to improve the rectification effect on the gas.
[0054] The present application also discloses a rectifier tube, comprising a tube body and a rectifier grid. The rectifier grid is arranged at the air inlet end of the tube body. The rectifier grid is the rectifier grid recorded in any one of the above schemes.
[0055] Since the rectifying grid has the above-mentioned technical effects, the rectifying tube having the rectifying grid also has the same technical effects, which will not be described in detail here.
[0056] In this embodiment, the tube body is a straight tube, a rectifying grid is arranged at the air inlet end of the straight tube, and an air flow sensor is arranged at the air outlet end of the straight tube.
[0057] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. The scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in this application (but not limited to) to form a technical solution.
Claims
1. A rectifying grid, characterized in that: The invention comprises a grille body (1), a plurality of grille hole groups are arranged along the radial direction of the grille body (1), each of the grille hole groups comprises a plurality of circles of grille holes (2) arranged around the center of the grille body (1), The apertures of the grille holes (2) of the grille hole group gradually increase from the center of the grille body (1) to the periphery of the grille body (1), and the arrangement density of the grille holes (2) of the grille hole group gradually decreases from the center of the grille body (1) to the periphery of the grille body (1).
2. The rectifying grid according to claim 1, characterized in that: The apertures of the grille holes (2) of each group of grille holes are the same along the radial direction of the grille body (1).
3. The rectifying grid according to claim 1 or 2, characterized in that: The arrangement density of the grille holes (2) in each group of the grille holes is equal along the radial direction of the grille body (1).
4. The rectifying grid according to claim 1, characterized in that: The apertures of the grille holes (2) of the grille hole group gradually increase along the radial direction of the grille body (1).
5. The rectifying grid according to any one of claims 1 to 4, characterized in that: The arrangement widths of the grille hole groups located at different positions in the radial direction of the grille body (1) are the same or different.
6. The rectifying grid according to claim 1, characterized in that: The grille holes (2) of the grille hole groups located at different positions in the radial direction of the grille body (1) have the same or different shapes.
7. The rectifying grid according to claim 1 or 6, characterized in that: The grille holes (2) of the grille hole groups located at different positions in the radial direction of the grille body (1) have the same or different shapes.
8. The rectifying grid according to claim 1, characterized in that: The grille holes (2) are square holes or round holes.
9. The rectifying grid according to claim 1, characterized in that: A central grille hole is arranged at the center of the grille body (1), and the aperture of the central grille hole is smaller than or equal to the aperture of the grille hole (2) of the grille hole group adjacent to the central grille hole.
10. A rectifier tube, characterized in that: It comprises a tube body and a rectifying grid, wherein the rectifying grid is arranged at the air inlet end of the tube body, and the rectifying grid is the rectifying grid according to any one of claims 1 to 9, The tube body is a straight tube.