Rectifying tube

Abstract

The rectifying tube comprises an air inlet straight tube, an arc-shaped tube and an air outlet straight tube, the two ends of the arc-shaped tube communicate with the air inlet straight tube and the air outlet straight tube correspondingly, a rectifying grating is arranged at the end, not communicating with the arc-shaped tube, of the air inlet straight tube, and an air flow sensor is arranged at the end, not communicating with the arc-shaped tube, of the air outlet straight tube. The rectifier tube disclosed by the utility model is integrally in a bent tube shape, and compared with a rectifier tube which is integrally in a linear shape, the overall length is shortened, so that the occupied space of the rectifier tube in the gas flowing direction can be reduced to a certain extent, and the layout difficulty of the rectifier tube is reduced; meanwhile, guide vanes are arranged in the arc-shaped pipes and used for guiding the gas entering the arc-shaped pipes, so that the gas is prevented from being separated from the pipe wall and vortex in the gas outlet straight pipe, the flowing condition of the gas in the gas outlet straight pipe is more stable, and on the premise that the length of the rectifying pipe is shortened, the rectifying efficiency of the rectifying pipe is improved. And the measurement precision of the air flow sensor is ensured.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a rectifier tube. Background Art

[0002] The air flow sensor uses the thermal test principle. When there is no gas circulation, a symmetrical temperature field is formed around the measuring head of the air flow sensor. When there is gas circulation, the gas with different flow rates flowing through the air flow sensor takes away different amounts of heat, and the temperature around the measuring head changes differently. The temperature change of the measuring head will cause the resistance value of the air flow sensor to change, such as Figure 2 As shown in the figure, the relationship between gas flow rate and resistance value is obtained according to the diameter of the rectifier tube and the gas temperature, and then the gas flow rate is obtained.

[0003] 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. Figure 1 As shown, the rectifier tube in the prior art includes a tube body 01 and a rectifier grille 02, wherein the rectifier grille 02 is arranged at the air inlet end of the tube body 01, and the air flow sensor 03 is installed at the air outlet end of the tube body 01. The front end of the rectifier tube in the prior art is generally designed as a straight tube, and according to the measurement accuracy requirement, the length of the straight tube needs to be designed to be 2-5 times the diameter of the straight tube, resulting in a longer overall length of the rectifier tube and increased layout difficulty.

[0004] Therefore, how to shorten the overall length of the rectifier tube to reduce the difficulty of layout has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The present application proposes a rectifier tube to reduce the overall length of the rectifier tube and reduce the difficulty of layout.

[0006] In order to achieve the above-mentioned purpose, the present application provides a rectifier tube, comprising an air inlet straight tube, an arc tube and an air outlet straight tube, wherein the two ends of the arc tube are respectively connected to the air inlet straight tube and the air outlet straight tube.

[0007] The air intake straight pipe is provided with a rectifying grid, and the air outlet straight pipe is provided with an air flow sensor.

[0008] The arc tube is provided with a plurality of guide vanes arranged along the circumference of the arc tube. The guide vanes are arranged along the axial direction of the arc tube and are used to guide the gas so that the gas is evenly distributed in the outlet straight tube.

[0009] Preferably, in the above-mentioned rectifier tube, the guide vanes include front guide vanes and / or rear guide vanes.

[0010] The front guide vane is arranged at the air inlet end of the arc-shaped tube, and is used to reduce the amplitude of the sudden increase of gas velocity at the air inlet end of the arc-shaped tube due to the expansion pressure.

[0011] The rear guide vane is arranged in the middle of the arc tube in the axial direction, and is used to reduce the pressure gradient in the arc tube, so as to increase the turbulence in the arc tube and weaken the laminar flow.

[0012] Preferably, in the above-mentioned rectifier tube, the length of the front guide vane is less than or equal to the length of the rear guide vane.

[0013] Preferably, in the above-mentioned rectifier tube, the angle between the circumferential surface where the rear guide vane is located and the axis of the outlet straight tube is α, and the curvature of the arc tube is β, α=0.5β±10°.

[0014] Preferably, in the above-mentioned rectifier tube, the rear guide vane is located opposite to the front guide vane;

[0015] Alternatively, the rear guide vane and the front guide vane are arranged in a staggered manner.

[0016] Preferably, in the above-mentioned rectifier tube, the front ends of the front guide blade and the rear guide blade are semicircular, the rear ends of the front guide blade and the rear guide blade are triangular, the length of the front end of the front guide blade is smaller than the length of the rear end of the front guide blade, and the length of the front end of the rear guide blade is smaller than the length of the rear end of the rear guide blade.

[0017] The front end of the front guide vane is located in the air intake straight pipe.

[0018] Preferably, in the above-mentioned rectifying tube, the width of the guide vane gradually decreases from the tube wall of the arc-shaped tube toward the axis of the arc-shaped tube.

[0019] Preferably, in the above-mentioned rectifier tube, the thickness of the guide vane at various positions along the axial direction of the arc-shaped tube is equal or unequal.

[0020] Preferably, in the above-mentioned rectifier tube, the thicknesses of the plurality of guide vanes located on the same circumference are equal or unequal.

[0021] Preferably, in the above-mentioned rectifier tube, the curvature of the arc tube is at least 90°.

[0022] The rectifier tube provided in the embodiment of the present application comprises an inlet straight tube, an arc tube and an outlet straight tube, the two ends of the arc tube are respectively connected to the inlet straight tube and the outlet straight tube, a rectifier grille is arranged at the end of the inlet straight tube not connected to the arc tube, and an air flow sensor is arranged at the end of the outlet straight tube not connected to the arc tube. The rectifier tube disclosed in the present application arranges an arc tube between the inlet straight tube and the outlet straight tube so that the rectifier tube is in the shape of a curved tube as a whole. The overall length of the rectifier tube in the shape of a curved tube is relatively shortened relative to the rectifier tube in the shape of a straight line as a whole, which can reduce the occupied space of the rectifier tube along the gas flow direction to a certain extent and reduce the layout difficulty of the rectifier tube; at the same time, in the present scheme, a guide vane is arranged in the arc tube, and the guide vane is used to guide the gas entering the arc tube to prevent the separation of the gas flow and the tube wall and the vortex in the outlet straight tube, so that the flow of the gas in the outlet straight tube is more stable, so as to achieve the measurement accuracy of the air flow sensor under the premise of shortening the length of the rectifier tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a structural schematic diagram of a rectifier tube in the prior art;

[0025] Figure 2 It is the relationship between the temperature and resistance value of the measuring head of the air flow sensor;

[0026] Figure 3 It is a structural schematic diagram of the rectifier tube of the present application;

[0027] Figure 4 It is a schematic structural diagram of the guide vane of the rectifier tube of the present application;

[0028] Figure 5 is a cross-sectional view of the rectifier tube of the present application along AA;

[0029] Figure 6 is a cross-sectional view of the rectifier tube of the present application along BB;

[0030] Figure 7 is a cross-sectional view of the rectifier tube of the present application along YY;

[0031] Figure 8 yes Figure 5 Enlarged view of middle I;

[0032] Fig. 9 It is a schematic diagram of the gas flow in the rectifying tube without guide vanes in the present application;

[0033] Fig.10 This is a gas velocity flow field diagram of an axial section of a rectifier tube without guide vanes in the present application;

[0034] Fig.11 This is a gas velocity flow field diagram of the axial section of the rectifying tube with guide vanes provided in the present application.

[0035] The accompanying drawings are as follows:

[0036] 01-tube body; 02-rectifier grille; 03-air flow sensor;

[0037] 1-intake straight pipe; 2-arc pipe; 3-exhaust straight pipe; 4-rectifier grille; 5-air flow sensor; 6-guide vane; 61-front guide vane; 62-rear guide vane. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] See also Figure 1-Figure 11 .

[0044] Some embodiments of the present application disclose a rectifier tube, comprising an intake straight pipe 1, an arc-shaped pipe 2 and an outlet straight pipe 3, wherein the two ends of the arc-shaped pipe 2 are respectively connected to the intake straight pipe 1 and the outlet straight pipe 3, a rectifier grille 4 is arranged at the end of the intake straight pipe 1 not connected to the arc-shaped pipe 2, and an air flow sensor 5 is arranged at the end of the outlet straight pipe 3 not connected to the arc-shaped pipe 2.

[0045] The rectifier tube disclosed in the present application arranges an arc tube 2 between the air inlet straight tube 1 and the air outlet straight tube 3 so that the rectifier tube is in the shape of a curved tube as a whole. The overall length of the rectifier tube in the shape of a curved tube is relatively shortened compared to the rectifier tube in the shape of a straight line as a whole, which can reduce the space occupied by the rectifier tube along the gas flow direction to a certain extent and reduce the difficulty of the layout of the rectifier tube.

[0046] In this scheme, the air inlet position and the air outlet position of the rectifier tube are still straight tubes, which are the air inlet straight tube 1 and the air outlet straight tube 3 respectively.

[0047] like Figure 3 As shown, the rectifier tube disclosed in the present application is L-shaped as a whole, and the angle between the air inlet straight tube 1 and the air outlet straight tube 3 is determined by the arc tube 2. The curvature of the arc tube 2 is β, 90°≤β≤150°, the air inlet straight tube 1 is arranged along the tangent direction of the air inlet end of the arc tube 2, and the air outlet straight tube 3 is arranged along the tangent direction of the air outlet end of the arc tube 2. In this solution, the angle between the air inlet straight tube 1 and the air outlet straight tube 3 of the rectifier tube is consistent with the curvature of the arc tube 2.

[0048] Fluid simulation is performed on the rectifier tube with a bent tube structure at the front end of the air flow sensor 5. For the convenience of subsequent description, the intake end of the intake straight pipe 1 is named AB, the outlet end of the intake straight pipe 1 is at the same position as the intake end of the arc tube 2, named CD here, the outlet end of the arc tube 2 is at the same position as the intake end of the outlet straight pipe 3, named EF here, and the outlet end of the outlet straight pipe 3 is named GH. From AB to CD, the gas flows steadily in the rectifier tube in a laminar state; from CD to EF, the gas inside the arc tube 2 is expanded along the tangent direction of point C, and the degree of expansion is greater than that of the subsequent pipeline, resulting in a sudden increase in the air flow velocity at point C. As the degree of expansion in the arc tube 2 increases, the pressure of the gas inside the arc tube 2 from C to G is a process of increasing continuously, and the gas at point G will flow to point C, that is, a vortex is formed on the inside of the arc tube 2 and the inside of the outlet straight tube 3, and the air flow is separated from the tube wall. At the same time, the gas flows in the arc tube 2, and there is a centrifugal force, and the gas will undergo the following Fig. 9 In the flow shown by the horizontal arrow, the gas flow velocity outside the arc tube 2 is greater than the gas flow velocity inside the arc tube 2, the pressure at point D is greater than the pressure at point C, the gas pressure outside the arc tube 2 is greater than the gas pressure inside the arc tube 2, and a pressure gradient is formed between the outside and inside of the arc tube 2. After the gas leaves the elbow, the flow of the gas outside the outlet straight tube 3 tends to be stable. The pressure at point G is equal to the pressure at point H. It can be inferred that the pressure at point H is less than the pressure at point D. It is not easy to form vortices on the outside of the tube wall, that is, the gas from point F to point H is laminar flow. The velocity flow field in the rectifier tube is as follows: Fig. 9 As shown in the figure, the air flow is easily separated from the pipe wall on the inner side of the straight outlet pipe 3, and there is a pressure gradient at this position in the direction perpendicular to the axis of the straight outlet pipe 3, which leads to a complicated gas flow in the straight outlet pipe 3, affecting the accuracy of the measurement result of the air flow sensor 5.

[0049] The separation of airflow and tube wall is explained here. The separation of airflow and tube wall is that the gas flowing close to the tube wall is separated from the wall surface of the tube wall. The reason for the separation of airflow and tube wall is that the gas moves in laminar flow in the tube and the gas itself has viscosity. The gas close to the tube wall will flow from high pressure to low pressure in the rectifier tube and deviate from the mainstream gas, resulting in the separation of airflow and tube wall.

[0050] In this solution, a guide vane 6 is provided in the arc tube 2. The guide vane 6 is used to guide the gas entering the arc tube 2 to reduce the influence of the expansion pressure in the arc tube 2 on the gas flow velocity and pressure, so as to prevent the separation of the gas flow and the tube wall in the outlet straight tube 3 and prevent the formation of vortices. At the same time, the gradient of pressure change is reduced, so that the gas in the outlet straight tube 3 has a more stable laminar flow, so as to ensure the measurement accuracy of the air flow sensor 5.

[0051] Specifically, there are multiple guide blades 6, and multiple guide blades 6 are arranged along the circumferential direction of the tube wall of the arc tube 2, and a single guide blade 6 is arranged along the axial direction of the arc tube 2 to guide the gas inside and outside the arc tube 2 in the flow direction of the gas.

[0052] Along the axial direction of the arc-shaped tube 2 , only one circle of guide blades 6 may be provided, or at least two circles of guide blades 6 may be provided.

[0053] The rectifying grid 4 processes the gas entering the rectifying tube, and the guide vane 6 processes the gas entering the arc tube 2. The two cooperate to effectively even the gas entering the outlet straight tube 3, optimize the gas flow field in the outlet straight tube 3, and prevent the separation of the airflow and the tube wall and the formation of vortices.

[0054] like Figure 5 As shown, the guide vanes 6 are arranged to protrude from the tube wall of the arc-shaped tube 2 to guide the gas near the tube wall of the arc-shaped tube 2 .

[0055] In an embodiment in which only one circle of guide vanes 6 is provided in the arc tube 2, a plurality of guide vanes 6 are distributed on the circumference of the tube wall of the arc tube 2. The setting positions of the guide vanes 6 are designed according to the gas wall separation in the arc tube 2 and the pressure gradient. When the gas wall separation is severe and / or the pressure gradient is large, the number of guide vanes 6 can be appropriately increased.

[0056] The guide vane 6 includes a front guide vane 61 and / or a rear guide vane 62. Specifically, the guide vane 6 may include only the front guide vane 61, only the rear guide vane 62, or both the front guide vane 61 and the rear guide vane 62.

[0057] In the embodiment where the guide vane 6 only includes the front guide vane 61, the front guide vane 61 is arranged at the air inlet end of the arc tube 2 to reduce the magnitude of the sudden increase in the gas velocity caused by the pressure expansion at the air inlet end of the arc tube 2, so as to reduce the influence of the pressure expansion on the gas flow rate and pressure. The mode where the guide vane 6 only includes the front guide vane 61 is suitable for the case where the radius of the circle where the arc tube 2 is located is greater than or equal to three times the diameter of the arc tube 2.

[0058] In the embodiment where the guide vane 6 only includes the rear guide vane 62, the rear guide vane 62 is arranged in the middle of the axial direction of the arc tube 2, and is used to reduce the pressure gradient in the arc tube 2 along the direction perpendicular to its own axis, so as to increase the turbulence in the arc tube 2 and weaken the laminar flow. The mode where the guide vane 6 only includes the rear guide vane 62 is suitable for the case where the curvature β of the arc tube 2 is greater than 130° and β is less than 150°.

[0059] In some embodiments of the present application, Figure 4-Figure 7As shown, the guide vane 6 includes a front guide vane 61 and a rear guide vane 62, and the front guide vane 61 is located upstream of the rear guide vane 62. Specifically, the front guide vane 61 is arranged at the inlet end of the arc tube 2 to reduce the magnitude of the sudden increase in the velocity of the gas at the inlet end of the arc tube 2 due to the pressure expansion, so as to reduce the influence of the pressure expansion on the gas flow rate and pressure. Since the pressure expansion degree of the gas is the largest at point C, preferably, the front guide vane 61 is arranged at the inlet end where the arc tube 2 is connected to the inlet straight pipe 1, that is, Fig. 9 rear guide vane 62 is disposed in the middle of the axial direction of the arc tube 2, for reducing the pressure gradient in the arc tube 2 along the direction perpendicular to its own axis, so as to increase the turbulence in the arc tube 2, weaken the laminar flow, such as Fig. 9 As shown, the velocity of the gas in the middle of the axial direction of the arc tube 2 changes significantly in a gradient. Setting the rear guide vane 62 in the middle of the axial direction of the arc tube 2 can maximize the effect of increasing the turbulence in the arc tube 2 and weakening the laminar flow.

[0060] There is a certain distance between the front guide vane 61 and the rear guide vane 62, so that the gas flows between the front guide vane 61 and the rear guide vane 62 for a certain distance before flowing through the rear guide vane 62.

[0061] The pressure gradient of the gas begins to change after the middle and upper part of the arc tube 2. In order to improve the effect of the rear guide vane 62, the length of the front guide vane 61 is less than or equal to the length of the rear guide vane 62. It should be noted here that the lengths of the front guide vane 61 and the rear guide vane 62 are the dimensions of the front guide vane 61 and the rear guide vane 62 along the axial direction of the arc tube 2.

[0062] The front guide vane 61 and the rear guide vane 62 are both arranged close to the wall of the arc-shaped tube 2 , and change with the change of the arc-shaped tube 2 .

[0063] The length of the rear guide vane 62 is at least 1.5 times the length of the front guide vane 61 to ensure the guide capability of the rear guide vane 62 .

[0064] In this solution, the angle α between the circumferential surface where the rear guide vane 62 is located and the axis of the outlet straight pipe 3 is half of the curvature β of the arc pipe 2 ±10°.

[0065] The main function of the front guide vane 61 is to Fig. 9 The sudden pressure expansion at point C disappears, so there will be no sudden pressure drop. The rear guide vane 62 is intended to reduce the pressure gradient from C to D, increase the internal turbulence of the pipeline, and reduce laminar flow. When α<0.5β, this effect will be weakened and the effect will be poor. Therefore, α=0.5β±10° is preferred.

[0066] The front guide vane 61 and the rear guide vane 62 are positioned correspondingly in the circumferential direction of the tube wall of the arc tube 2, or the front guide vane 61 and the rear guide vane 62 are staggered in the circumferential direction of the tube wall of the arc tube 2 to further disrupt the stable flow state of the gas and increase the turbulence inside the pipeline.

[0067] According to the severity of the separation between the airflow in the rectifier tube and the tube wall, the design of the guide vanes can be increased. The number of the front guide vanes 61 and the rear guide vanes 62 can be equal or unequal. When the number of the front guide vanes 61 and the rear guide vanes 62 is unequal, the number of the front guide vanes 61 is greater than the number of the rear guide vanes 62, or the number of the front guide vanes 61 is less than the number of the rear guide vanes 62.

[0068] The front guide vane 61 and the rear guide vane 62 cooperate to solve the problem of separation of airflow from the pipe wall on the inner side of the outlet straight pipe 3 due to pressure expansion and pressure gradient after the gas enters the bent pipe, and the problem of uneven pressure gradient distribution in the outlet straight pipe 3, so that the gas flows in the outlet straight pipe 3 in the form of laminar flow, so as to improve the measurement accuracy of the air flow sensor 5.

[0069] It can be understood that after the gas passes through the front guide vane 61, the change in gas flow rate caused by the expansion pressure is weakened, and the change in the pressure gradient in the rectifier tube is reduced. The rear guide vane 62 further weakens the pressure gradient, so that the airflow entering the outlet straight pipe 3 has a small pressure gradient in the direction perpendicular to the axis of the outlet straight pipe 3, that is, the gas flow rate in the direction perpendicular to the axis of the outlet straight pipe 3 is close, so that the gas can move more easily in the outlet straight pipe 3 in a laminar flow form.

[0070] The shapes of the front guide vane 61 and the rear guide vane 62 may be the same or different.

[0071] In some embodiments of the present application, as shown in the figure, the front guide vane 61 and the rear guide vane 62 have the same shape.

[0072] Specifically, the front ends of the front guide blade 61 and the rear guide blade 62 are semicircular, the rear ends of the front guide blade 61 and the rear guide blade 62 are triangular, and the length of the front ends of the front guide blade 61 and the rear guide blade 62 is less than the length of the rear ends of the front guide blade 61 and the rear guide blade 62.

[0073] Since the front guide blade 61 and the rear guide blade 62 have the same shape, the front guide blade 61 is used as an example for description. The front guide blade 61 is thick at the front and thin at the rear. The front end of the front guide blade 61 is used to reduce the speed of the gas passing through the front guide blade 61, and the rear end of the front guide blade 61 is used to enhance the guiding effect on the gas. After passing through the guiding effect of the rear end of the front guide blade 61, the gas converges together instead of being split. The gas passing through the front guide blade 61 flows in the state after merging, and the flow is more stable.

[0074] The front end of the front guide vane 61 is located in the intake straight pipe 1 to minimize the impact of the expansion pressure on the gas flow.

[0075] Preferably, the thickness of the guide vane 6 at each position along the axial direction of the arc-shaped tube 2 is equal. It should be noted here that the thickness of the guide vane 6 is the dimension of the guide vane 6 protruding from the tube wall of the arc-shaped tube 2.

[0076] The width of the guide vane 6 gradually decreases along the radial direction of the arc-shaped tube 2 .

[0077] In some embodiments of the present application, the width of the guide blade 6 gradually decreases along the axial direction of the arc tube 2, and the width along the radial direction of the arc tube 2 gradually decreases, and the flow channel between two adjacent guide blades 6 gradually increases in width along the axial direction of the arc tube 2 and the width along the radial direction of the arc tube 2 gradually increases.

[0078] The thickness of the guide blade 6 at various positions along the axial direction of the arc-shaped tube 2 may also be unequal, and is specifically designed according to the need for flow guidance.

[0079] If the gas is near the wall of the arc tube 2 and the gas velocity changes greatly along the radial direction of the arc tube 2, the thickness of the guide vane 6 needs to be increased. Preferably, the side of the guide vane 6 away from the wall of the arc tube 2 is a smooth plane, and the entire outer circumferential surface of the guide vane 6 is a smooth surface.

[0080] The thickness of the guide vanes 6 located on the same circumference may be equal or unequal, which is specifically determined according to the distribution of the gas in the arc tube 2 .

[0081] Preferably, the air inlet straight pipe 1 and the air outlet straight pipe 3 may be connected to the bent pipe in a fixed connection or in a detachable connection.

[0082] As shown in the figure, the air inlet straight pipe 1 is plug-connected with the bent pipe, and the bent pipe is plug-connected with the air outlet straight pipe 3.

[0083] The air inlet straight pipe 1 and the bent pipe can be connected by welding, and the bent pipe and the air outlet straight pipe 3 can also be connected by welding.

[0084] The connection between the guide vane 6 and the curved pipe can be integrally formed or welded.

[0085] 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 rectifier tube, It is characterized in that It comprises an air inlet straight pipe (1), an arc-shaped pipe (2) and an air outlet straight pipe (3), wherein two ends of the arc-shaped pipe (2) are respectively connected to the air inlet straight pipe (1) and the air outlet straight pipe (3). The air intake straight pipe (1) is provided with a rectifying grid (4), and the air outlet straight pipe (3) is provided with an air flow sensor (5). A plurality of guide vanes (6) are arranged in the arc-shaped tube (2) along the circumference of the arc-shaped tube (2); the guide vanes (6) are arranged along the axial direction of the arc-shaped tube (2); and the guide vanes (6) are used to guide the gas so that the gas is evenly distributed in the gas outlet straight tube (3).

2. The rectifier tube according to claim 1, It is characterized in that The guide vane (6) comprises a front guide vane (61) and / or a rear guide vane (62), The front guide vane (61) is arranged at the air inlet end of the arc-shaped tube (2) and is used to reduce the amplitude of the sudden increase in gas velocity at the air inlet end of the arc-shaped tube (2) caused by the expansion pressure. The rear guide vane (62) is arranged in the middle of the arc-shaped tube (2) in the axial direction, and is used to reduce the pressure gradient in the arc-shaped tube (2), thereby increasing the turbulence in the arc-shaped tube (2) and weakening the laminar flow.

3. The rectifier tube according to claim 2, It is characterized in that The length of the front guide blade (61) is less than or equal to the length of the rear guide blade (62).

4. The rectifier tube according to claim 2, It is characterized in that The angle between the circumferential surface where the rear guide vane (62) is located and the axis of the outlet straight pipe (3) is α, and the curvature of the arc-shaped pipe (2) is β, where α=0.5β±10°.

5. The rectifier tube according to claim 2, It is characterized in that The rear guide blade (62) is located opposite to the front guide blade (61); Alternatively, the rear guide blade (62) and the front guide blade (61) are arranged in a staggered manner.

6. The rectifier tube according to claim 2, It is characterized in that The front ends of the front guide blade (61) and the rear guide blade (62) are semicircular, and the rear ends of the front guide blade (61) and the rear guide blade (62) are triangular. The length of the front end of the front guide blade (61) is shorter than the length of the rear end of the front guide blade (61), and the length of the front end of the rear guide blade (62) is shorter than the length of the rear end of the rear guide blade (62). The front end of the front guide vane (61) is located inside the air intake straight pipe (1).

7. The rectifier tube according to any one of claims 1 to 6, It is characterized in that The width of the guide blade (6) gradually decreases from the tube wall of the arc-shaped tube (2) toward the axis of the arc-shaped tube (2).

8. The rectifier tube according to any one of claims 1 to 6, It is characterized in that The thickness of the guide blade (6) at various positions along the axial direction of the arc-shaped tube (2) is equal or unequal.

9. The rectifier tube according to any one of claims 1 to 6, It is characterized in that The thicknesses of the plurality of guide blades (6) located on the same circumference are equal or unequal.

10. The rectifier tube according to any one of claims 1 to 6, It is characterized in that The arc angle of the arc-shaped tube (2) is at least 90°.

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